drivers/s390/block/dasd_eckd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/compat.h>
  22 #include <linux/init.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/css_chars.h>
  26 #include <asm/debug.h>
  27 #include <asm/idals.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/io.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/cio.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/itcw.h>
  34 #include <asm/schid.h>
  35 #include <asm/chpid.h>
  36
  37 #include "dasd_int.h"
  38 #include "dasd_eckd.h"
  39
  40 #ifdef PRINTK_HEADER
  41 #undef PRINTK_HEADER
  42 #endif                          /* PRINTK_HEADER */
  43 #define PRINTK_HEADER "dasd(eckd):"
  44
  45 /*
  46  * raw track access always map to 64k in memory
  47  * so it maps to 16 blocks of 4k per track
  48  */
  49 #define DASD_RAW_BLOCK_PER_TRACK 16
  50 #define DASD_RAW_BLOCKSIZE 4096
  51 /* 64k are 128 x 512 byte sectors  */
  52 #define DASD_RAW_SECTORS_PER_TRACK 128
  53
  54 MODULE_LICENSE("GPL");
  55
  56 static struct dasd_discipline dasd_eckd_discipline;
  57
  58 /* The ccw bus type uses this table to find devices that it sends to
  59  * dasd_eckd_probe */
  60 static struct ccw_device_id dasd_eckd_ids[] = {
  61         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  62         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  63         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  64         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  65         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  66         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  67         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  68         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  69         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  70         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  71         { /* end of list */ },
  72 };
  73
  74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  75
  76 static struct ccw_driver dasd_eckd_driver; /* see below */
  77
  78 static void *rawpadpage;
  79
  80 #define INIT_CQR_OK 0
  81 #define INIT_CQR_UNFORMATTED 1
  82 #define INIT_CQR_ERROR 2
  83
  84 /* emergency request for reserve/release */
  85 static struct {
  86         struct dasd_ccw_req cqr;
  87         struct ccw1 ccw;
  88         char data[32];
  89 } *dasd_reserve_req;
  90 static DEFINE_MUTEX(dasd_reserve_mutex);
  91
  92 static struct {
  93         struct dasd_ccw_req cqr;
  94         struct ccw1 ccw[2];
  95         char data[40];
  96 } *dasd_vol_info_req;
  97 static DEFINE_MUTEX(dasd_vol_info_mutex);
  98
  99 struct ext_pool_exhaust_work_data {
 100         struct work_struct worker;
 101         struct dasd_device *device;
 102         struct dasd_device *base;
 103 };
 104
 105 /* definitions for the path verification worker */
 106 struct pe_handler_work_data {
 107         struct work_struct worker;
 108         struct dasd_device *device;
 109         struct dasd_ccw_req cqr;
 110         struct ccw1 ccw;
 111         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 112         int isglobal;
 113         __u8 tbvpm;
 114         __u8 fcsecpm;
 115 };
 116 static struct pe_handler_work_data *pe_handler_worker;
 117 static DEFINE_MUTEX(dasd_pe_handler_mutex);
 118
 119 struct check_attention_work_data {
 120         struct work_struct worker;
 121         struct dasd_device *device;
 122         __u8 lpum;
 123 };
 124
 125 static int dasd_eckd_ext_pool_id(struct dasd_device *);
 126 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 127                         struct dasd_device *, struct dasd_device *,
 128                         unsigned int, int, unsigned int, unsigned int,
 129                         unsigned int, unsigned int);
 130
 131 /* initial attempt at a probe function. this can be simplified once
 132  * the other detection code is gone */
 133 static int
 134 dasd_eckd_probe (struct ccw_device *cdev)
 135 {
 136         int ret;
 137
 138         /* set ECKD specific ccw-device options */
 139         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 140                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 141         if (ret) {
 142                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 143                                 "dasd_eckd_probe: could not set "
 144                                 "ccw-device options");
 145                 return ret;
 146         }
 147         ret = dasd_generic_probe(cdev);
 148         return ret;
 149 }
 150
 151 static int
 152 dasd_eckd_set_online(struct ccw_device *cdev)
 153 {
 154         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 155 }
 156
 157 static const int sizes_trk0[] = { 28, 148, 84 };
 158 #define LABEL_SIZE 140
 159
 160 /* head and record addresses of count_area read in analysis ccw */
 161 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
 162 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 163
 164 static inline unsigned int
 165 ceil_quot(unsigned int d1, unsigned int d2)
 166 {
 167         return (d1 + (d2 - 1)) / d2;
 168 }
 169
 170 static unsigned int
 171 recs_per_track(struct dasd_eckd_characteristics * rdc,
 172                unsigned int kl, unsigned int dl)
 173 {
 174         int dn, kn;
 175
 176         switch (rdc->dev_type) {
 177         case 0x3380:
 178                 if (kl)
 179                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 180                                        ceil_quot(dl + 12, 32));
 181                 else
 182                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 183         case 0x3390:
 184                 dn = ceil_quot(dl + 6, 232) + 1;
 185                 if (kl) {
 186                         kn = ceil_quot(kl + 6, 232) + 1;
 187                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 188                                        9 + ceil_quot(dl + 6 * dn, 34));
 189                 } else
 190                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 191         case 0x9345:
 192                 dn = ceil_quot(dl + 6, 232) + 1;
 193                 if (kl) {
 194                         kn = ceil_quot(kl + 6, 232) + 1;
 195                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 196                                        ceil_quot(dl + 6 * dn, 34));
 197                 } else
 198                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 199         }
 200         return 0;
 201 }
 202
 203 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 204 {
 205         geo->cyl = (__u16) cyl;
 206         geo->head = cyl >> 16;
 207         geo->head <<= 4;
 208         geo->head |= head;
 209 }
 210
 211 /*
 212  * calculate failing track from sense data depending if
 213  * it is an EAV device or not
 214  */
 215 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
 216                                     sector_t *track)
 217 {
 218         struct dasd_eckd_private *private = device->private;
 219         u8 *sense = NULL;
 220         u32 cyl;
 221         u8 head;
 222
 223         sense = dasd_get_sense(irb);
 224         if (!sense) {
 225                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 226                               "ESE error no sense data\n");
 227                 return -EINVAL;
 228         }
 229         if (!(sense[27] & DASD_SENSE_BIT_2)) {
 230                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 231                               "ESE error no valid track data\n");
 232                 return -EINVAL;
 233         }
 234
 235         if (sense[27] & DASD_SENSE_BIT_3) {
 236                 /* enhanced addressing */
 237                 cyl = sense[30] << 20;
 238                 cyl |= (sense[31] & 0xF0) << 12;
 239                 cyl |= sense[28] << 8;
 240                 cyl |= sense[29];
 241         } else {
 242                 cyl = sense[29] << 8;
 243                 cyl |= sense[30];
 244         }
 245         head = sense[31] & 0x0F;
 246         *track = cyl * private->rdc_data.trk_per_cyl + head;
 247         return 0;
 248 }
 249
 250 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
 251                      struct dasd_device *device)
 252 {
 253         struct dasd_eckd_private *private = device->private;
 254         int rc;
 255
 256         rc = get_phys_clock(&data->ep_sys_time);
 257         /*
 258          * Ignore return code if XRC is not supported or
 259          * sync clock is switched off
 260          */
 261         if ((rc && !private->rdc_data.facilities.XRC_supported) ||
 262             rc == -EOPNOTSUPP || rc == -EACCES)
 263                 return 0;
 264
 265         /* switch on System Time Stamp - needed for XRC Support */
 266         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 267         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 268
 269         if (ccw) {
 270                 ccw->count = sizeof(struct DE_eckd_data);
 271                 ccw->flags |= CCW_FLAG_SLI;
 272         }
 273
 274         return rc;
 275 }
 276
 277 static int
 278 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 279               unsigned int totrk, int cmd, struct dasd_device *device,
 280               int blksize)
 281 {
 282         struct dasd_eckd_private *private = device->private;
 283         u16 heads, beghead, endhead;
 284         u32 begcyl, endcyl;
 285         int rc = 0;
 286
 287         if (ccw) {
 288                 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 289                 ccw->flags = 0;
 290                 ccw->count = 16;
 291                 ccw->cda = (__u32)virt_to_phys(data);
 292         }
 293
 294         memset(data, 0, sizeof(struct DE_eckd_data));
 295         switch (cmd) {
 296         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 297         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 298         case DASD_ECKD_CCW_READ:
 299         case DASD_ECKD_CCW_READ_MT:
 300         case DASD_ECKD_CCW_READ_CKD:
 301         case DASD_ECKD_CCW_READ_CKD_MT:
 302         case DASD_ECKD_CCW_READ_KD:
 303         case DASD_ECKD_CCW_READ_KD_MT:
 304                 data->mask.perm = 0x1;
 305                 data->attributes.operation = private->attrib.operation;
 306                 break;
 307         case DASD_ECKD_CCW_READ_COUNT:
 308                 data->mask.perm = 0x1;
 309                 data->attributes.operation = DASD_BYPASS_CACHE;
 310                 break;
 311         case DASD_ECKD_CCW_READ_TRACK:
 312         case DASD_ECKD_CCW_READ_TRACK_DATA:
 313                 data->mask.perm = 0x1;
 314                 data->attributes.operation = private->attrib.operation;
 315                 data->blk_size = 0;
 316                 break;
 317         case DASD_ECKD_CCW_WRITE:
 318         case DASD_ECKD_CCW_WRITE_MT:
 319         case DASD_ECKD_CCW_WRITE_KD:
 320         case DASD_ECKD_CCW_WRITE_KD_MT:
 321                 data->mask.perm = 0x02;
 322                 data->attributes.operation = private->attrib.operation;
 323                 rc = set_timestamp(ccw, data, device);
 324                 break;
 325         case DASD_ECKD_CCW_WRITE_CKD:
 326         case DASD_ECKD_CCW_WRITE_CKD_MT:
 327                 data->attributes.operation = DASD_BYPASS_CACHE;
 328                 rc = set_timestamp(ccw, data, device);
 329                 break;
 330         case DASD_ECKD_CCW_ERASE:
 331         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 332         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 333                 data->mask.perm = 0x3;
 334                 data->mask.auth = 0x1;
 335                 data->attributes.operation = DASD_BYPASS_CACHE;
 336                 rc = set_timestamp(ccw, data, device);
 337                 break;
 338         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 339                 data->mask.perm = 0x03;
 340                 data->attributes.operation = private->attrib.operation;
 341                 data->blk_size = 0;
 342                 break;
 343         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 344                 data->mask.perm = 0x02;
 345                 data->attributes.operation = private->attrib.operation;
 346                 data->blk_size = blksize;
 347                 rc = set_timestamp(ccw, data, device);
 348                 break;
 349         default:
 350                 dev_err(&device->cdev->dev,
 351                         "0x%x is not a known command\n", cmd);
 352                 break;
 353         }
 354
 355         data->attributes.mode = 0x3;    /* ECKD */
 356
 357         if ((private->rdc_data.cu_type == 0x2105 ||
 358              private->rdc_data.cu_type == 0x2107 ||
 359              private->rdc_data.cu_type == 0x1750)
 360             && !(private->uses_cdl && trk < 2))
 361                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 362
 363         heads = private->rdc_data.trk_per_cyl;
 364         begcyl = trk / heads;
 365         beghead = trk % heads;
 366         endcyl = totrk / heads;
 367         endhead = totrk % heads;
 368
 369         /* check for sequential prestage - enhance cylinder range */
 370         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 371             data->attributes.operation == DASD_SEQ_ACCESS) {
 372
 373                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 374                         endcyl += private->attrib.nr_cyl;
 375                 else
 376                         endcyl = (private->real_cyl - 1);
 377         }
 378
 379         set_ch_t(&data->beg_ext, begcyl, beghead);
 380         set_ch_t(&data->end_ext, endcyl, endhead);
 381         return rc;
 382 }
 383
 384
 385 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
 386                               unsigned int trk, unsigned int rec_on_trk,
 387                               int count, int cmd, struct dasd_device *device,
 388                               unsigned int reclen, unsigned int tlf)
 389 {
 390         struct dasd_eckd_private *private = device->private;
 391         int sector;
 392         int dn, d;
 393
 394         if (ccw) {
 395                 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
 396                 ccw->flags = 0;
 397                 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
 398                         ccw->count = 22;
 399                 else
 400                         ccw->count = 20;
 401                 ccw->cda = (__u32)virt_to_phys(data);
 402         }
 403
 404         memset(data, 0, sizeof(*data));
 405         sector = 0;
 406         if (rec_on_trk) {
 407                 switch (private->rdc_data.dev_type) {
 408                 case 0x3390:
 409                         dn = ceil_quot(reclen + 6, 232);
 410                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 411                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 412                         break;
 413                 case 0x3380:
 414                         d = 7 + ceil_quot(reclen + 12, 32);
 415                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 416                         break;
 417                 }
 418         }
 419         data->sector = sector;
 420         /* note: meaning of count depends on the operation
 421          *       for record based I/O it's the number of records, but for
 422          *       track based I/O it's the number of tracks
 423          */
 424         data->count = count;
 425         switch (cmd) {
 426         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 427                 data->operation.orientation = 0x3;
 428                 data->operation.operation = 0x03;
 429                 break;
 430         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 431                 data->operation.orientation = 0x3;
 432                 data->operation.operation = 0x16;
 433                 break;
 434         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 435                 data->operation.orientation = 0x1;
 436                 data->operation.operation = 0x03;
 437                 data->count++;
 438                 break;
 439         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 440                 data->operation.orientation = 0x3;
 441                 data->operation.operation = 0x16;
 442                 data->count++;
 443                 break;
 444         case DASD_ECKD_CCW_WRITE:
 445         case DASD_ECKD_CCW_WRITE_MT:
 446         case DASD_ECKD_CCW_WRITE_KD:
 447         case DASD_ECKD_CCW_WRITE_KD_MT:
 448                 data->auxiliary.length_valid = 0x1;
 449                 data->length = reclen;
 450                 data->operation.operation = 0x01;
 451                 break;
 452         case DASD_ECKD_CCW_WRITE_CKD:
 453         case DASD_ECKD_CCW_WRITE_CKD_MT:
 454                 data->auxiliary.length_valid = 0x1;
 455                 data->length = reclen;
 456                 data->operation.operation = 0x03;
 457                 break;
 458         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 459                 data->operation.orientation = 0x0;
 460                 data->operation.operation = 0x3F;
 461                 data->extended_operation = 0x11;
 462                 data->length = 0;
 463                 data->extended_parameter_length = 0x02;
 464                 if (data->count > 8) {
 465                         data->extended_parameter[0] = 0xFF;
 466                         data->extended_parameter[1] = 0xFF;
 467                         data->extended_parameter[1] <<= (16 - count);
 468                 } else {
 469                         data->extended_parameter[0] = 0xFF;
 470                         data->extended_parameter[0] <<= (8 - count);
 471                         data->extended_parameter[1] = 0x00;
 472                 }
 473                 data->sector = 0xFF;
 474                 break;
 475         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 476                 data->auxiliary.length_valid = 0x1;
 477                 data->length = reclen;  /* not tlf, as one might think */
 478                 data->operation.operation = 0x3F;
 479                 data->extended_operation = 0x23;
 480                 break;
 481         case DASD_ECKD_CCW_READ:
 482         case DASD_ECKD_CCW_READ_MT:
 483         case DASD_ECKD_CCW_READ_KD:
 484         case DASD_ECKD_CCW_READ_KD_MT:
 485                 data->auxiliary.length_valid = 0x1;
 486                 data->length = reclen;
 487                 data->operation.operation = 0x06;
 488                 break;
 489         case DASD_ECKD_CCW_READ_CKD:
 490         case DASD_ECKD_CCW_READ_CKD_MT:
 491                 data->auxiliary.length_valid = 0x1;
 492                 data->length = reclen;
 493                 data->operation.operation = 0x16;
 494                 break;
 495         case DASD_ECKD_CCW_READ_COUNT:
 496                 data->operation.operation = 0x06;
 497                 break;
 498         case DASD_ECKD_CCW_READ_TRACK:
 499                 data->operation.orientation = 0x1;
 500                 data->operation.operation = 0x0C;
 501                 data->extended_parameter_length = 0;
 502                 data->sector = 0xFF;
 503                 break;
 504         case DASD_ECKD_CCW_READ_TRACK_DATA:
 505                 data->auxiliary.length_valid = 0x1;
 506                 data->length = tlf;
 507                 data->operation.operation = 0x0C;
 508                 break;
 509         case DASD_ECKD_CCW_ERASE:
 510                 data->length = reclen;
 511                 data->auxiliary.length_valid = 0x1;
 512                 data->operation.operation = 0x0b;
 513                 break;
 514         default:
 515                 DBF_DEV_EVENT(DBF_ERR, device,
 516                             "fill LRE unknown opcode 0x%x", cmd);
 517                 BUG();
 518         }
 519         set_ch_t(&data->seek_addr,
 520                  trk / private->rdc_data.trk_per_cyl,
 521                  trk % private->rdc_data.trk_per_cyl);
 522         data->search_arg.cyl = data->seek_addr.cyl;
 523         data->search_arg.head = data->seek_addr.head;
 524         data->search_arg.record = rec_on_trk;
 525 }
 526
 527 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 528                       unsigned int trk, unsigned int totrk, int cmd,
 529                       struct dasd_device *basedev, struct dasd_device *startdev,
 530                       unsigned int format, unsigned int rec_on_trk, int count,
 531                       unsigned int blksize, unsigned int tlf)
 532 {
 533         struct dasd_eckd_private *basepriv, *startpriv;
 534         struct LRE_eckd_data *lredata;
 535         struct DE_eckd_data *dedata;
 536         int rc = 0;
 537
 538         basepriv = basedev->private;
 539         startpriv = startdev->private;
 540         dedata = &pfxdata->define_extent;
 541         lredata = &pfxdata->locate_record;
 542
 543         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 544         ccw->flags = 0;
 545         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 546                 ccw->count = sizeof(*pfxdata) + 2;
 547                 ccw->cda = (__u32)virt_to_phys(pfxdata);
 548                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 549         } else {
 550                 ccw->count = sizeof(*pfxdata);
 551                 ccw->cda = (__u32)virt_to_phys(pfxdata);
 552                 memset(pfxdata, 0, sizeof(*pfxdata));
 553         }
 554
 555         /* prefix data */
 556         if (format > 1) {
 557                 DBF_DEV_EVENT(DBF_ERR, basedev,
 558                               "PFX LRE unknown format 0x%x", format);
 559                 BUG();
 560                 return -EINVAL;
 561         }
 562         pfxdata->format = format;
 563         pfxdata->base_address = basepriv->conf.ned->unit_addr;
 564         pfxdata->base_lss = basepriv->conf.ned->ID;
 565         pfxdata->validity.define_extent = 1;
 566
 567         /* private uid is kept up to date, conf_data may be outdated */
 568         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 569                 pfxdata->validity.verify_base = 1;
 570
 571         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 572                 pfxdata->validity.verify_base = 1;
 573                 pfxdata->validity.hyper_pav = 1;
 574         }
 575
 576         rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
 577
 578         /*
 579          * For some commands the System Time Stamp is set in the define extent
 580          * data when XRC is supported. The validity of the time stamp must be
 581          * reflected in the prefix data as well.
 582          */
 583         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
 584                 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
 585
 586         if (format == 1) {
 587                 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
 588                                   basedev, blksize, tlf);
 589         }
 590
 591         return rc;
 592 }
 593
 594 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 595                   unsigned int trk, unsigned int totrk, int cmd,
 596                   struct dasd_device *basedev, struct dasd_device *startdev)
 597 {
 598         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 599                           0, 0, 0, 0, 0);
 600 }
 601
 602 static void
 603 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 604               unsigned int rec_on_trk, int no_rec, int cmd,
 605               struct dasd_device * device, int reclen)
 606 {
 607         struct dasd_eckd_private *private = device->private;
 608         int sector;
 609         int dn, d;
 610
 611         DBF_DEV_EVENT(DBF_INFO, device,
 612                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 613                   trk, rec_on_trk, no_rec, cmd, reclen);
 614
 615         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 616         ccw->flags = 0;
 617         ccw->count = 16;
 618         ccw->cda = (__u32)virt_to_phys(data);
 619
 620         memset(data, 0, sizeof(struct LO_eckd_data));
 621         sector = 0;
 622         if (rec_on_trk) {
 623                 switch (private->rdc_data.dev_type) {
 624                 case 0x3390:
 625                         dn = ceil_quot(reclen + 6, 232);
 626                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 627                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 628                         break;
 629                 case 0x3380:
 630                         d = 7 + ceil_quot(reclen + 12, 32);
 631                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 632                         break;
 633                 }
 634         }
 635         data->sector = sector;
 636         data->count = no_rec;
 637         switch (cmd) {
 638         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 639                 data->operation.orientation = 0x3;
 640                 data->operation.operation = 0x03;
 641                 break;
 642         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 643                 data->operation.orientation = 0x3;
 644                 data->operation.operation = 0x16;
 645                 break;
 646         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 647                 data->operation.orientation = 0x1;
 648                 data->operation.operation = 0x03;
 649                 data->count++;
 650                 break;
 651         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 652                 data->operation.orientation = 0x3;
 653                 data->operation.operation = 0x16;
 654                 data->count++;
 655                 break;
 656         case DASD_ECKD_CCW_WRITE:
 657         case DASD_ECKD_CCW_WRITE_MT:
 658         case DASD_ECKD_CCW_WRITE_KD:
 659         case DASD_ECKD_CCW_WRITE_KD_MT:
 660                 data->auxiliary.last_bytes_used = 0x1;
 661                 data->length = reclen;
 662                 data->operation.operation = 0x01;
 663                 break;
 664         case DASD_ECKD_CCW_WRITE_CKD:
 665         case DASD_ECKD_CCW_WRITE_CKD_MT:
 666                 data->auxiliary.last_bytes_used = 0x1;
 667                 data->length = reclen;
 668                 data->operation.operation = 0x03;
 669                 break;
 670         case DASD_ECKD_CCW_READ:
 671         case DASD_ECKD_CCW_READ_MT:
 672         case DASD_ECKD_CCW_READ_KD:
 673         case DASD_ECKD_CCW_READ_KD_MT:
 674                 data->auxiliary.last_bytes_used = 0x1;
 675                 data->length = reclen;
 676                 data->operation.operation = 0x06;
 677                 break;
 678         case DASD_ECKD_CCW_READ_CKD:
 679         case DASD_ECKD_CCW_READ_CKD_MT:
 680                 data->auxiliary.last_bytes_used = 0x1;
 681                 data->length = reclen;
 682                 data->operation.operation = 0x16;
 683                 break;
 684         case DASD_ECKD_CCW_READ_COUNT:
 685                 data->operation.operation = 0x06;
 686                 break;
 687         case DASD_ECKD_CCW_ERASE:
 688                 data->length = reclen;
 689                 data->auxiliary.last_bytes_used = 0x1;
 690                 data->operation.operation = 0x0b;
 691                 break;
 692         default:
 693                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 694                               "opcode 0x%x", cmd);
 695         }
 696         set_ch_t(&data->seek_addr,
 697                  trk / private->rdc_data.trk_per_cyl,
 698                  trk % private->rdc_data.trk_per_cyl);
 699         data->search_arg.cyl = data->seek_addr.cyl;
 700         data->search_arg.head = data->seek_addr.head;
 701         data->search_arg.record = rec_on_trk;
 702 }
 703
 704 /*
 705  * Returns 1 if the block is one of the special blocks that needs
 706  * to get read/written with the KD variant of the command.
 707  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 708  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 709  * Luckily the KD variants differ only by one bit (0x08) from the
 710  * normal variant. So don't wonder about code like:
 711  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 712  *         ccw->cmd_code |= 0x8;
 713  */
 714 static inline int
 715 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 716 {
 717         if (recid < 3)
 718                 return 1;
 719         if (recid < blk_per_trk)
 720                 return 0;
 721         if (recid < 2 * blk_per_trk)
 722                 return 1;
 723         return 0;
 724 }
 725
 726 /*
 727  * Returns the record size for the special blocks of the cdl format.
 728  * Only returns something useful if dasd_eckd_cdl_special is true
 729  * for the recid.
 730  */
 731 static inline int
 732 dasd_eckd_cdl_reclen(int recid)
 733 {
 734         if (recid < 3)
 735                 return sizes_trk0[recid];
 736         return LABEL_SIZE;
 737 }
 738 /* create unique id from private structure. */
 739 static void create_uid(struct dasd_conf *conf, struct dasd_uid *uid)
 740 {
 741         int count;
 742
 743         memset(uid, 0, sizeof(struct dasd_uid));
 744         memcpy(uid->vendor, conf->ned->HDA_manufacturer,
 745                sizeof(uid->vendor) - 1);
 746         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 747         memcpy(uid->serial, &conf->ned->serial,
 748                sizeof(uid->serial) - 1);
 749         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 750         uid->ssid = conf->gneq->subsystemID;
 751         uid->real_unit_addr = conf->ned->unit_addr;
 752         if (conf->sneq) {
 753                 uid->type = conf->sneq->sua_flags;
 754                 if (uid->type == UA_BASE_PAV_ALIAS)
 755                         uid->base_unit_addr = conf->sneq->base_unit_addr;
 756         } else {
 757                 uid->type = UA_BASE_DEVICE;
 758         }
 759         if (conf->vdsneq) {
 760                 for (count = 0; count < 16; count++) {
 761                         sprintf(uid->vduit+2*count, "%02x",
 762                                 conf->vdsneq->uit[count]);
 763                 }
 764         }
 765 }
 766
 767 /*
 768  * Generate device unique id that specifies the physical device.
 769  */
 770 static int dasd_eckd_generate_uid(struct dasd_device *device)
 771 {
 772         struct dasd_eckd_private *private = device->private;
 773         unsigned long flags;
 774
 775         if (!private)
 776                 return -ENODEV;
 777         if (!private->conf.ned || !private->conf.gneq)
 778                 return -ENODEV;
 779         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 780         create_uid(&private->conf, &private->uid);
 781         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 782         return 0;
 783 }
 784
 785 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 786 {
 787         struct dasd_eckd_private *private = device->private;
 788         unsigned long flags;
 789
 790         if (private) {
 791                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 792                 *uid = private->uid;
 793                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 794                 return 0;
 795         }
 796         return -EINVAL;
 797 }
 798
 799 /*
 800  * compare device UID with data of a given dasd_eckd_private structure
 801  * return 0 for match
 802  */
 803 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 804                                       struct dasd_conf *path_conf)
 805 {
 806         struct dasd_uid device_uid;
 807         struct dasd_uid path_uid;
 808
 809         create_uid(path_conf, &path_uid);
 810         dasd_eckd_get_uid(device, &device_uid);
 811
 812         return memcmp(&device_uid, &path_uid, sizeof(struct dasd_uid));
 813 }
 814
 815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 816                                    struct dasd_ccw_req *cqr,
 817                                    __u8 *rcd_buffer,
 818                                    __u8 lpm)
 819 {
 820         struct ccw1 *ccw;
 821         /*
 822          * buffer has to start with EBCDIC "V1.0" to show
 823          * support for virtual device SNEQ
 824          */
 825         rcd_buffer[0] = 0xE5;
 826         rcd_buffer[1] = 0xF1;
 827         rcd_buffer[2] = 0x4B;
 828         rcd_buffer[3] = 0xF0;
 829
 830         ccw = cqr->cpaddr;
 831         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 832         ccw->flags = 0;
 833         ccw->cda = (__u32)virt_to_phys(rcd_buffer);
 834         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 835         cqr->magic = DASD_ECKD_MAGIC;
 836
 837         cqr->startdev = device;
 838         cqr->memdev = device;
 839         cqr->block = NULL;
 840         cqr->expires = 10*HZ;
 841         cqr->lpm = lpm;
 842         cqr->retries = 256;
 843         cqr->buildclk = get_tod_clock();
 844         cqr->status = DASD_CQR_FILLED;
 845         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 846 }
 847
 848 /*
 849  * Wakeup helper for read_conf
 850  * if the cqr is not done and needs some error recovery
 851  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 852  * to show support for virtual device SNEQ
 853  */
 854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 855 {
 856         struct ccw1 *ccw;
 857         __u8 *rcd_buffer;
 858
 859         if (cqr->status !=  DASD_CQR_DONE) {
 860                 ccw = cqr->cpaddr;
 861                 rcd_buffer = phys_to_virt(ccw->cda);
 862                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 863
 864                 rcd_buffer[0] = 0xE5;
 865                 rcd_buffer[1] = 0xF1;
 866                 rcd_buffer[2] = 0x4B;
 867                 rcd_buffer[3] = 0xF0;
 868         }
 869         dasd_wakeup_cb(cqr, data);
 870 }
 871
 872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 873                                            struct dasd_ccw_req *cqr,
 874                                            __u8 *rcd_buffer,
 875                                            __u8 lpm)
 876 {
 877         struct ciw *ciw;
 878         int rc;
 879         /*
 880          * sanity check: scan for RCD command in extended SenseID data
 881          * some devices do not support RCD
 882          */
 883         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 884         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 885                 return -EOPNOTSUPP;
 886
 887         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 888         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 889         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 890         cqr->retries = 5;
 891         cqr->callback = read_conf_cb;
 892         rc = dasd_sleep_on_immediatly(cqr);
 893         return rc;
 894 }
 895
 896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 897                                    void **rcd_buffer,
 898                                    int *rcd_buffer_size, __u8 lpm)
 899 {
 900         struct ciw *ciw;
 901         char *rcd_buf = NULL;
 902         int ret;
 903         struct dasd_ccw_req *cqr;
 904
 905         /*
 906          * sanity check: scan for RCD command in extended SenseID data
 907          * some devices do not support RCD
 908          */
 909         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 910         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 911                 ret = -EOPNOTSUPP;
 912                 goto out_error;
 913         }
 914         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 915         if (!rcd_buf) {
 916                 ret = -ENOMEM;
 917                 goto out_error;
 918         }
 919         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 920                                    0, /* use rcd_buf as data ara */
 921                                    device, NULL);
 922         if (IS_ERR(cqr)) {
 923                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 924                               "Could not allocate RCD request");
 925                 ret = -ENOMEM;
 926                 goto out_error;
 927         }
 928         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 929         cqr->callback = read_conf_cb;
 930         ret = dasd_sleep_on(cqr);
 931         /*
 932          * on success we update the user input parms
 933          */
 934         dasd_sfree_request(cqr, cqr->memdev);
 935         if (ret)
 936                 goto out_error;
 937
 938         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 939         *rcd_buffer = rcd_buf;
 940         return 0;
 941 out_error:
 942         kfree(rcd_buf);
 943         *rcd_buffer = NULL;
 944         *rcd_buffer_size = 0;
 945         return ret;
 946 }
 947
 948 static int dasd_eckd_identify_conf_parts(struct dasd_conf *conf)
 949 {
 950
 951         struct dasd_sneq *sneq;
 952         int i, count;
 953
 954         conf->ned = NULL;
 955         conf->sneq = NULL;
 956         conf->vdsneq = NULL;
 957         conf->gneq = NULL;
 958         count = conf->len / sizeof(struct dasd_sneq);
 959         sneq = (struct dasd_sneq *)conf->data;
 960         for (i = 0; i < count; ++i) {
 961                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 962                         conf->sneq = sneq;
 963                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 964                         conf->vdsneq = (struct vd_sneq *)sneq;
 965                 else if (sneq->flags.identifier == 2)
 966                         conf->gneq = (struct dasd_gneq *)sneq;
 967                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 968                         conf->ned = (struct dasd_ned *)sneq;
 969                 sneq++;
 970         }
 971         if (!conf->ned || !conf->gneq) {
 972                 conf->ned = NULL;
 973                 conf->sneq = NULL;
 974                 conf->vdsneq = NULL;
 975                 conf->gneq = NULL;
 976                 return -EINVAL;
 977         }
 978         return 0;
 979
 980 };
 981
 982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 983 {
 984         struct dasd_gneq *gneq;
 985         int i, count, found;
 986
 987         count = conf_len / sizeof(*gneq);
 988         gneq = (struct dasd_gneq *)conf_data;
 989         found = 0;
 990         for (i = 0; i < count; ++i) {
 991                 if (gneq->flags.identifier == 2) {
 992                         found = 1;
 993                         break;
 994                 }
 995                 gneq++;
 996         }
 997         if (found)
 998                 return ((char *)gneq)[18] & 0x07;
 999         else
1000                 return 0;
1001 }
1002
1003 static void dasd_eckd_store_conf_data(struct dasd_device *device,
1004                                       struct dasd_conf_data *conf_data, int chp)
1005 {
1006         struct dasd_eckd_private *private = device->private;
1007         struct channel_path_desc_fmt0 *chp_desc;
1008         struct subchannel_id sch_id;
1009         void *cdp;
1010
1011         /*
1012          * path handling and read_conf allocate data
1013          * free it before replacing the pointer
1014          * also replace the old private->conf_data pointer
1015          * with the new one if this points to the same data
1016          */
1017         cdp = device->path[chp].conf_data;
1018         if (private->conf.data == cdp) {
1019                 private->conf.data = (void *)conf_data;
1020                 dasd_eckd_identify_conf_parts(&private->conf);
1021         }
1022         ccw_device_get_schid(device->cdev, &sch_id);
1023         device->path[chp].conf_data = conf_data;
1024         device->path[chp].cssid = sch_id.cssid;
1025         device->path[chp].ssid = sch_id.ssid;
1026         chp_desc = ccw_device_get_chp_desc(device->cdev, chp);
1027         if (chp_desc)
1028                 device->path[chp].chpid = chp_desc->chpid;
1029         kfree(chp_desc);
1030         kfree(cdp);
1031 }
1032
1033 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1034 {
1035         struct dasd_eckd_private *private = device->private;
1036         int i;
1037
1038         private->conf.data = NULL;
1039         private->conf.len = 0;
1040         for (i = 0; i < 8; i++) {
1041                 kfree(device->path[i].conf_data);
1042                 device->path[i].conf_data = NULL;
1043                 device->path[i].cssid = 0;
1044                 device->path[i].ssid = 0;
1045                 device->path[i].chpid = 0;
1046                 dasd_path_notoper(device, i);
1047         }
1048 }
1049
1050 static void dasd_eckd_read_fc_security(struct dasd_device *device)
1051 {
1052         struct dasd_eckd_private *private = device->private;
1053         u8 esm_valid;
1054         u8 esm[8];
1055         int chp;
1056         int rc;
1057
1058         rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
1059         if (rc) {
1060                 for (chp = 0; chp < 8; chp++)
1061                         device->path[chp].fc_security = 0;
1062                 return;
1063         }
1064
1065         for (chp = 0; chp < 8; chp++) {
1066                 if (esm_valid & (0x80 >> chp))
1067                         device->path[chp].fc_security = esm[chp];
1068                 else
1069                         device->path[chp].fc_security = 0;
1070         }
1071 }
1072
1073 static void dasd_eckd_get_uid_string(struct dasd_conf *conf,
1074                                      char *print_uid)
1075 {
1076         struct dasd_uid uid;
1077
1078         create_uid(conf, &uid);
1079         if (strlen(uid.vduit) > 0)
1080                 snprintf(print_uid, sizeof(*print_uid),
1081                          "%s.%s.%04x.%02x.%s",
1082                          uid.vendor, uid.serial, uid.ssid,
1083                          uid.real_unit_addr, uid.vduit);
1084         else
1085                 snprintf(print_uid, sizeof(*print_uid),
1086                          "%s.%s.%04x.%02x",
1087                          uid.vendor, uid.serial, uid.ssid,
1088                          uid.real_unit_addr);
1089 }
1090
1091 static int dasd_eckd_check_cabling(struct dasd_device *device,
1092                                    void *conf_data, __u8 lpm)
1093 {
1094         struct dasd_eckd_private *private = device->private;
1095         char print_path_uid[60], print_device_uid[60];
1096         struct dasd_conf path_conf;
1097
1098         path_conf.data = conf_data;
1099         path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1100         if (dasd_eckd_identify_conf_parts(&path_conf))
1101                 return 1;
1102
1103         if (dasd_eckd_compare_path_uid(device, &path_conf)) {
1104                 dasd_eckd_get_uid_string(&path_conf, print_path_uid);
1105                 dasd_eckd_get_uid_string(&private->conf, print_device_uid);
1106                 dev_err(&device->cdev->dev,
1107                         "Not all channel paths lead to the same device, path %02X leads to device %s instead of %s\n",
1108                         lpm, print_path_uid, print_device_uid);
1109                 return 1;
1110         }
1111
1112         return 0;
1113 }
1114
1115 static int dasd_eckd_read_conf(struct dasd_device *device)
1116 {
1117         void *conf_data;
1118         int conf_len, conf_data_saved;
1119         int rc, path_err, pos;
1120         __u8 lpm, opm;
1121         struct dasd_eckd_private *private;
1122
1123         private = device->private;
1124         opm = ccw_device_get_path_mask(device->cdev);
1125         conf_data_saved = 0;
1126         path_err = 0;
1127         /* get configuration data per operational path */
1128         for (lpm = 0x80; lpm; lpm>>= 1) {
1129                 if (!(lpm & opm))
1130                         continue;
1131                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1132                                              &conf_len, lpm);
1133                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1134                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1135                                         "Read configuration data returned "
1136                                         "error %d", rc);
1137                         return rc;
1138                 }
1139                 if (conf_data == NULL) {
1140                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1141                                         "No configuration data "
1142                                         "retrieved");
1143                         /* no further analysis possible */
1144                         dasd_path_add_opm(device, opm);
1145                         continue;       /* no error */
1146                 }
1147                 /* save first valid configuration data */
1148                 if (!conf_data_saved) {
1149                         /* initially clear previously stored conf_data */
1150                         dasd_eckd_clear_conf_data(device);
1151                         private->conf.data = conf_data;
1152                         private->conf.len = conf_len;
1153                         if (dasd_eckd_identify_conf_parts(&private->conf)) {
1154                                 private->conf.data = NULL;
1155                                 private->conf.len = 0;
1156                                 kfree(conf_data);
1157                                 continue;
1158                         }
1159                         /*
1160                          * build device UID that other path data
1161                          * can be compared to it
1162                          */
1163                         dasd_eckd_generate_uid(device);
1164                         conf_data_saved++;
1165                 } else if (dasd_eckd_check_cabling(device, conf_data, lpm)) {
1166                         dasd_path_add_cablepm(device, lpm);
1167                         path_err = -EINVAL;
1168                         kfree(conf_data);
1169                         continue;
1170                 }
1171
1172                 pos = pathmask_to_pos(lpm);
1173                 dasd_eckd_store_conf_data(device, conf_data, pos);
1174
1175                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1176                 case 0x02:
1177                         dasd_path_add_nppm(device, lpm);
1178                         break;
1179                 case 0x03:
1180                         dasd_path_add_ppm(device, lpm);
1181                         break;
1182                 }
1183                 if (!dasd_path_get_opm(device)) {
1184                         dasd_path_set_opm(device, lpm);
1185                         dasd_generic_path_operational(device);
1186                 } else {
1187                         dasd_path_add_opm(device, lpm);
1188                 }
1189         }
1190
1191         return path_err;
1192 }
1193
1194 static u32 get_fcx_max_data(struct dasd_device *device)
1195 {
1196         struct dasd_eckd_private *private = device->private;
1197         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1198         unsigned int mdc;
1199         int tpm;
1200
1201         if (dasd_nofcx)
1202                 return 0;
1203         /* is transport mode supported? */
1204         fcx_in_css = css_general_characteristics.fcx;
1205         fcx_in_gneq = private->conf.gneq->reserved2[7] & 0x04;
1206         fcx_in_features = private->features.feature[40] & 0x80;
1207         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1208
1209         if (!tpm)
1210                 return 0;
1211
1212         mdc = ccw_device_get_mdc(device->cdev, 0);
1213         if (mdc == 0) {
1214                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1215                 return 0;
1216         } else {
1217                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1218         }
1219 }
1220
1221 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1222 {
1223         struct dasd_eckd_private *private = device->private;
1224         unsigned int mdc;
1225         u32 fcx_max_data;
1226
1227         if (private->fcx_max_data) {
1228                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1229                 if (mdc == 0) {
1230                         dev_warn(&device->cdev->dev,
1231                                  "Detecting the maximum data size for zHPF "
1232                                  "requests failed (rc=%d) for a new path %x\n",
1233                                  mdc, lpm);
1234                         return mdc;
1235                 }
1236                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1237                 if (fcx_max_data < private->fcx_max_data) {
1238                         dev_warn(&device->cdev->dev,
1239                                  "The maximum data size for zHPF requests %u "
1240                                  "on a new path %x is below the active maximum "
1241                                  "%u\n", fcx_max_data, lpm,
1242                                  private->fcx_max_data);
1243                         return -EACCES;
1244                 }
1245         }
1246         return 0;
1247 }
1248
1249 static int rebuild_device_uid(struct dasd_device *device,
1250                               struct pe_handler_work_data *data)
1251 {
1252         struct dasd_eckd_private *private = device->private;
1253         __u8 lpm, opm = dasd_path_get_opm(device);
1254         int rc = -ENODEV;
1255
1256         for (lpm = 0x80; lpm; lpm >>= 1) {
1257                 if (!(lpm & opm))
1258                         continue;
1259                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1260                 memset(&data->cqr, 0, sizeof(data->cqr));
1261                 data->cqr.cpaddr = &data->ccw;
1262                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1263                                                      data->rcd_buffer,
1264                                                      lpm);
1265
1266                 if (rc) {
1267                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1268                                 continue;
1269                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1270                                         "Read configuration data "
1271                                         "returned error %d", rc);
1272                         break;
1273                 }
1274                 memcpy(private->conf.data, data->rcd_buffer,
1275                        DASD_ECKD_RCD_DATA_SIZE);
1276                 if (dasd_eckd_identify_conf_parts(&private->conf)) {
1277                         rc = -ENODEV;
1278                 } else /* first valid path is enough */
1279                         break;
1280         }
1281
1282         if (!rc)
1283                 rc = dasd_eckd_generate_uid(device);
1284
1285         return rc;
1286 }
1287
1288 static void dasd_eckd_path_available_action(struct dasd_device *device,
1289                                             struct pe_handler_work_data *data)
1290 {
1291         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1292         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1293         struct dasd_conf_data *conf_data;
1294         struct dasd_conf path_conf;
1295         unsigned long flags;
1296         char print_uid[60];
1297         int rc, pos;
1298
1299         opm = 0;
1300         npm = 0;
1301         ppm = 0;
1302         epm = 0;
1303         hpfpm = 0;
1304         cablepm = 0;
1305
1306         for (lpm = 0x80; lpm; lpm >>= 1) {
1307                 if (!(lpm & data->tbvpm))
1308                         continue;
1309                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1310                 memset(&data->cqr, 0, sizeof(data->cqr));
1311                 data->cqr.cpaddr = &data->ccw;
1312                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1313                                                      data->rcd_buffer,
1314                                                      lpm);
1315                 if (!rc) {
1316                         switch (dasd_eckd_path_access(data->rcd_buffer,
1317                                                       DASD_ECKD_RCD_DATA_SIZE)
1318                                 ) {
1319                         case 0x02:
1320                                 npm |= lpm;
1321                                 break;
1322                         case 0x03:
1323                                 ppm |= lpm;
1324                                 break;
1325                         }
1326                         opm |= lpm;
1327                 } else if (rc == -EOPNOTSUPP) {
1328                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1329                                         "path verification: No configuration "
1330                                         "data retrieved");
1331                         opm |= lpm;
1332                 } else if (rc == -EAGAIN) {
1333                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1334                                         "path verification: device is stopped,"
1335                                         " try again later");
1336                         epm |= lpm;
1337                 } else {
1338                         dev_warn(&device->cdev->dev,
1339                                  "Reading device feature codes failed "
1340                                  "(rc=%d) for new path %x\n", rc, lpm);
1341                         continue;
1342                 }
1343                 if (verify_fcx_max_data(device, lpm)) {
1344                         opm &= ~lpm;
1345                         npm &= ~lpm;
1346                         ppm &= ~lpm;
1347                         hpfpm |= lpm;
1348                         continue;
1349                 }
1350
1351                 /*
1352                  * save conf_data for comparison after
1353                  * rebuild_device_uid may have changed
1354                  * the original data
1355                  */
1356                 memcpy(&path_rcd_buf, data->rcd_buffer,
1357                        DASD_ECKD_RCD_DATA_SIZE);
1358                 path_conf.data = (void *)&path_rcd_buf;
1359                 path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1360                 if (dasd_eckd_identify_conf_parts(&path_conf)) {
1361                         path_conf.data = NULL;
1362                         path_conf.len = 0;
1363                         continue;
1364                 }
1365
1366                 /*
1367                  * compare path UID with device UID only if at least
1368                  * one valid path is left
1369                  * in other case the device UID may have changed and
1370                  * the first working path UID will be used as device UID
1371                  */
1372                 if (dasd_path_get_opm(device) &&
1373                     dasd_eckd_compare_path_uid(device, &path_conf)) {
1374                         /*
1375                          * the comparison was not successful
1376                          * rebuild the device UID with at least one
1377                          * known path in case a z/VM hyperswap command
1378                          * has changed the device
1379                          *
1380                          * after this compare again
1381                          *
1382                          * if either the rebuild or the recompare fails
1383                          * the path can not be used
1384                          */
1385                         if (rebuild_device_uid(device, data) ||
1386                             dasd_eckd_compare_path_uid(
1387                                     device, &path_conf)) {
1388                                 dasd_eckd_get_uid_string(&path_conf, print_uid);
1389                                 dev_err(&device->cdev->dev,
1390                                         "The newly added channel path %02X "
1391                                         "will not be used because it leads "
1392                                         "to a different device %s\n",
1393                                         lpm, print_uid);
1394                                 opm &= ~lpm;
1395                                 npm &= ~lpm;
1396                                 ppm &= ~lpm;
1397                                 cablepm |= lpm;
1398                                 continue;
1399                         }
1400                 }
1401
1402                 conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
1403                 if (conf_data) {
1404                         memcpy(conf_data, data->rcd_buffer,
1405                                DASD_ECKD_RCD_DATA_SIZE);
1406                 } else {
1407                         /*
1408                          * path is operational but path config data could not
1409                          * be stored due to low mem condition
1410                          * add it to the error path mask and schedule a path
1411                          * verification later that this could be added again
1412                          */
1413                         epm |= lpm;
1414                 }
1415                 pos = pathmask_to_pos(lpm);
1416                 dasd_eckd_store_conf_data(device, conf_data, pos);
1417
1418                 /*
1419                  * There is a small chance that a path is lost again between
1420                  * above path verification and the following modification of
1421                  * the device opm mask. We could avoid that race here by using
1422                  * yet another path mask, but we rather deal with this unlikely
1423                  * situation in dasd_start_IO.
1424                  */
1425                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1426                 if (!dasd_path_get_opm(device) && opm) {
1427                         dasd_path_set_opm(device, opm);
1428                         dasd_generic_path_operational(device);
1429                 } else {
1430                         dasd_path_add_opm(device, opm);
1431                 }
1432                 dasd_path_add_nppm(device, npm);
1433                 dasd_path_add_ppm(device, ppm);
1434                 if (epm) {
1435                         dasd_path_add_tbvpm(device, epm);
1436                         dasd_device_set_timer(device, 50);
1437                 }
1438                 dasd_path_add_cablepm(device, cablepm);
1439                 dasd_path_add_nohpfpm(device, hpfpm);
1440                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1441
1442                 dasd_path_create_kobj(device, pos);
1443         }
1444 }
1445
1446 static void do_pe_handler_work(struct work_struct *work)
1447 {
1448         struct pe_handler_work_data *data;
1449         struct dasd_device *device;
1450
1451         data = container_of(work, struct pe_handler_work_data, worker);
1452         device = data->device;
1453
1454         /* delay path verification until device was resumed */
1455         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1456                 schedule_work(work);
1457                 return;
1458         }
1459         /* check if path verification already running and delay if so */
1460         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1461                 schedule_work(work);
1462                 return;
1463         }
1464
1465         if (data->tbvpm)
1466                 dasd_eckd_path_available_action(device, data);
1467         if (data->fcsecpm)
1468                 dasd_eckd_read_fc_security(device);
1469
1470         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1471         dasd_put_device(device);
1472         if (data->isglobal)
1473                 mutex_unlock(&dasd_pe_handler_mutex);
1474         else
1475                 kfree(data);
1476 }
1477
1478 static int dasd_eckd_pe_handler(struct dasd_device *device,
1479                                 __u8 tbvpm, __u8 fcsecpm)
1480 {
1481         struct pe_handler_work_data *data;
1482
1483         data = kzalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1484         if (!data) {
1485                 if (mutex_trylock(&dasd_pe_handler_mutex)) {
1486                         data = pe_handler_worker;
1487                         data->isglobal = 1;
1488                 } else {
1489                         return -ENOMEM;
1490                 }
1491         }
1492         INIT_WORK(&data->worker, do_pe_handler_work);
1493         dasd_get_device(device);
1494         data->device = device;
1495         data->tbvpm = tbvpm;
1496         data->fcsecpm = fcsecpm;
1497         schedule_work(&data->worker);
1498         return 0;
1499 }
1500
1501 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1502 {
1503         struct dasd_eckd_private *private = device->private;
1504         unsigned long flags;
1505
1506         if (!private->fcx_max_data)
1507                 private->fcx_max_data = get_fcx_max_data(device);
1508         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1509         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1510         dasd_schedule_device_bh(device);
1511         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1512 }
1513
1514 static int dasd_eckd_read_features(struct dasd_device *device)
1515 {
1516         struct dasd_eckd_private *private = device->private;
1517         struct dasd_psf_prssd_data *prssdp;
1518         struct dasd_rssd_features *features;
1519         struct dasd_ccw_req *cqr;
1520         struct ccw1 *ccw;
1521         int rc;
1522
1523         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1524         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1525                                    (sizeof(struct dasd_psf_prssd_data) +
1526                                     sizeof(struct dasd_rssd_features)),
1527                                    device, NULL);
1528         if (IS_ERR(cqr)) {
1529                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1530                                 "allocate initialization request");
1531                 return PTR_ERR(cqr);
1532         }
1533         cqr->startdev = device;
1534         cqr->memdev = device;
1535         cqr->block = NULL;
1536         cqr->retries = 256;
1537         cqr->expires = 10 * HZ;
1538
1539         /* Prepare for Read Subsystem Data */
1540         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1541         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1542         prssdp->order = PSF_ORDER_PRSSD;
1543         prssdp->suborder = 0x41;        /* Read Feature Codes */
1544         /* all other bytes of prssdp must be zero */
1545
1546         ccw = cqr->cpaddr;
1547         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1548         ccw->count = sizeof(struct dasd_psf_prssd_data);
1549         ccw->flags |= CCW_FLAG_CC;
1550         ccw->cda = (__u32)virt_to_phys(prssdp);
1551
1552         /* Read Subsystem Data - feature codes */
1553         features = (struct dasd_rssd_features *) (prssdp + 1);
1554         memset(features, 0, sizeof(struct dasd_rssd_features));
1555
1556         ccw++;
1557         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1558         ccw->count = sizeof(struct dasd_rssd_features);
1559         ccw->cda = (__u32)virt_to_phys(features);
1560
1561         cqr->buildclk = get_tod_clock();
1562         cqr->status = DASD_CQR_FILLED;
1563         rc = dasd_sleep_on(cqr);
1564         if (rc == 0) {
1565                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1566                 features = (struct dasd_rssd_features *) (prssdp + 1);
1567                 memcpy(&private->features, features,
1568                        sizeof(struct dasd_rssd_features));
1569         } else
1570                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1571                          " failed with rc=%d\n", rc);
1572         dasd_sfree_request(cqr, cqr->memdev);
1573         return rc;
1574 }
1575
1576 /* Read Volume Information - Volume Storage Query */
1577 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1578 {
1579         struct dasd_eckd_private *private = device->private;
1580         struct dasd_psf_prssd_data *prssdp;
1581         struct dasd_rssd_vsq *vsq;
1582         struct dasd_ccw_req *cqr;
1583         struct ccw1 *ccw;
1584         int useglobal;
1585         int rc;
1586
1587         /* This command cannot be executed on an alias device */
1588         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1589             private->uid.type == UA_HYPER_PAV_ALIAS)
1590                 return 0;
1591
1592         useglobal = 0;
1593         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1594                                    sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1595         if (IS_ERR(cqr)) {
1596                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1597                                 "Could not allocate initialization request");
1598                 mutex_lock(&dasd_vol_info_mutex);
1599                 useglobal = 1;
1600                 cqr = &dasd_vol_info_req->cqr;
1601                 memset(cqr, 0, sizeof(*cqr));
1602                 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1603                 cqr->cpaddr = &dasd_vol_info_req->ccw;
1604                 cqr->data = &dasd_vol_info_req->data;
1605                 cqr->magic = DASD_ECKD_MAGIC;
1606         }
1607
1608         /* Prepare for Read Subsystem Data */
1609         prssdp = cqr->data;
1610         prssdp->order = PSF_ORDER_PRSSD;
1611         prssdp->suborder = PSF_SUBORDER_VSQ;    /* Volume Storage Query */
1612         prssdp->lss = private->conf.ned->ID;
1613         prssdp->volume = private->conf.ned->unit_addr;
1614
1615         ccw = cqr->cpaddr;
1616         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1617         ccw->count = sizeof(*prssdp);
1618         ccw->flags |= CCW_FLAG_CC;
1619         ccw->cda = (__u32)virt_to_phys(prssdp);
1620
1621         /* Read Subsystem Data - Volume Storage Query */
1622         vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1623         memset(vsq, 0, sizeof(*vsq));
1624
1625         ccw++;
1626         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1627         ccw->count = sizeof(*vsq);
1628         ccw->flags |= CCW_FLAG_SLI;
1629         ccw->cda = (__u32)virt_to_phys(vsq);
1630
1631         cqr->buildclk = get_tod_clock();
1632         cqr->status = DASD_CQR_FILLED;
1633         cqr->startdev = device;
1634         cqr->memdev = device;
1635         cqr->block = NULL;
1636         cqr->retries = 256;
1637         cqr->expires = device->default_expires * HZ;
1638         /* The command might not be supported. Suppress the error output */
1639         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1640
1641         rc = dasd_sleep_on_interruptible(cqr);
1642         if (rc == 0) {
1643                 memcpy(&private->vsq, vsq, sizeof(*vsq));
1644         } else {
1645                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1646                                 "Reading the volume storage information failed with rc=%d", rc);
1647         }
1648
1649         if (useglobal)
1650                 mutex_unlock(&dasd_vol_info_mutex);
1651         else
1652                 dasd_sfree_request(cqr, cqr->memdev);
1653
1654         return rc;
1655 }
1656
1657 static int dasd_eckd_is_ese(struct dasd_device *device)
1658 {
1659         struct dasd_eckd_private *private = device->private;
1660
1661         return private->vsq.vol_info.ese;
1662 }
1663
1664 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1665 {
1666         struct dasd_eckd_private *private = device->private;
1667
1668         return private->vsq.extent_pool_id;
1669 }
1670
1671 /*
1672  * This value represents the total amount of available space. As more space is
1673  * allocated by ESE volumes, this value will decrease.
1674  * The data for this value is therefore updated on any call.
1675  */
1676 static int dasd_eckd_space_configured(struct dasd_device *device)
1677 {
1678         struct dasd_eckd_private *private = device->private;
1679         int rc;
1680
1681         rc = dasd_eckd_read_vol_info(device);
1682
1683         return rc ? : private->vsq.space_configured;
1684 }
1685
1686 /*
1687  * The value of space allocated by an ESE volume may have changed and is
1688  * therefore updated on any call.
1689  */
1690 static int dasd_eckd_space_allocated(struct dasd_device *device)
1691 {
1692         struct dasd_eckd_private *private = device->private;
1693         int rc;
1694
1695         rc = dasd_eckd_read_vol_info(device);
1696
1697         return rc ? : private->vsq.space_allocated;
1698 }
1699
1700 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1701 {
1702         struct dasd_eckd_private *private = device->private;
1703
1704         return private->vsq.logical_capacity;
1705 }
1706
1707 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1708 {
1709         struct ext_pool_exhaust_work_data *data;
1710         struct dasd_device *device;
1711         struct dasd_device *base;
1712
1713         data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1714         device = data->device;
1715         base = data->base;
1716
1717         if (!base)
1718                 base = device;
1719         if (dasd_eckd_space_configured(base) != 0) {
1720                 dasd_generic_space_avail(device);
1721         } else {
1722                 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1723                 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1724         }
1725
1726         dasd_put_device(device);
1727         kfree(data);
1728 }
1729
1730 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1731                                       struct dasd_ccw_req *cqr)
1732 {
1733         struct ext_pool_exhaust_work_data *data;
1734
1735         data = kzalloc(sizeof(*data), GFP_ATOMIC);
1736         if (!data)
1737                 return -ENOMEM;
1738         INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1739         dasd_get_device(device);
1740         data->device = device;
1741
1742         if (cqr->block)
1743                 data->base = cqr->block->base;
1744         else if (cqr->basedev)
1745                 data->base = cqr->basedev;
1746         else
1747                 data->base = NULL;
1748
1749         schedule_work(&data->worker);
1750
1751         return 0;
1752 }
1753
1754 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1755                                         struct dasd_rssd_lcq *lcq)
1756 {
1757         struct dasd_eckd_private *private = device->private;
1758         int pool_id = dasd_eckd_ext_pool_id(device);
1759         struct dasd_ext_pool_sum eps;
1760         int i;
1761
1762         for (i = 0; i < lcq->pool_count; i++) {
1763                 eps = lcq->ext_pool_sum[i];
1764                 if (eps.pool_id == pool_id) {
1765                         memcpy(&private->eps, &eps,
1766                                sizeof(struct dasd_ext_pool_sum));
1767                 }
1768         }
1769 }
1770
1771 /* Read Extent Pool Information - Logical Configuration Query */
1772 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1773 {
1774         struct dasd_eckd_private *private = device->private;
1775         struct dasd_psf_prssd_data *prssdp;
1776         struct dasd_rssd_lcq *lcq;
1777         struct dasd_ccw_req *cqr;
1778         struct ccw1 *ccw;
1779         int rc;
1780
1781         /* This command cannot be executed on an alias device */
1782         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1783             private->uid.type == UA_HYPER_PAV_ALIAS)
1784                 return 0;
1785
1786         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1787                                    sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1788         if (IS_ERR(cqr)) {
1789                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1790                                 "Could not allocate initialization request");
1791                 return PTR_ERR(cqr);
1792         }
1793
1794         /* Prepare for Read Subsystem Data */
1795         prssdp = cqr->data;
1796         memset(prssdp, 0, sizeof(*prssdp));
1797         prssdp->order = PSF_ORDER_PRSSD;
1798         prssdp->suborder = PSF_SUBORDER_LCQ;    /* Logical Configuration Query */
1799
1800         ccw = cqr->cpaddr;
1801         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1802         ccw->count = sizeof(*prssdp);
1803         ccw->flags |= CCW_FLAG_CC;
1804         ccw->cda = (__u32)virt_to_phys(prssdp);
1805
1806         lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1807         memset(lcq, 0, sizeof(*lcq));
1808
1809         ccw++;
1810         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1811         ccw->count = sizeof(*lcq);
1812         ccw->flags |= CCW_FLAG_SLI;
1813         ccw->cda = (__u32)virt_to_phys(lcq);
1814
1815         cqr->buildclk = get_tod_clock();
1816         cqr->status = DASD_CQR_FILLED;
1817         cqr->startdev = device;
1818         cqr->memdev = device;
1819         cqr->block = NULL;
1820         cqr->retries = 256;
1821         cqr->expires = device->default_expires * HZ;
1822         /* The command might not be supported. Suppress the error output */
1823         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1824
1825         rc = dasd_sleep_on_interruptible(cqr);
1826         if (rc == 0) {
1827                 dasd_eckd_cpy_ext_pool_data(device, lcq);
1828         } else {
1829                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1830                                 "Reading the logical configuration failed with rc=%d", rc);
1831         }
1832
1833         dasd_sfree_request(cqr, cqr->memdev);
1834
1835         return rc;
1836 }
1837
1838 /*
1839  * Depending on the device type, the extent size is specified either as
1840  * cylinders per extent (CKD) or size per extent (FBA)
1841  * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1842  */
1843 static int dasd_eckd_ext_size(struct dasd_device *device)
1844 {
1845         struct dasd_eckd_private *private = device->private;
1846         struct dasd_ext_pool_sum eps = private->eps;
1847
1848         if (!eps.flags.extent_size_valid)
1849                 return 0;
1850         if (eps.extent_size.size_1G)
1851                 return 1113;
1852         if (eps.extent_size.size_16M)
1853                 return 21;
1854
1855         return 0;
1856 }
1857
1858 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1859 {
1860         struct dasd_eckd_private *private = device->private;
1861
1862         return private->eps.warn_thrshld;
1863 }
1864
1865 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1866 {
1867         struct dasd_eckd_private *private = device->private;
1868
1869         return private->eps.flags.capacity_at_warnlevel;
1870 }
1871
1872 /*
1873  * Extent Pool out of space
1874  */
1875 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1876 {
1877         struct dasd_eckd_private *private = device->private;
1878
1879         return private->eps.flags.pool_oos;
1880 }
1881
1882 /*
1883  * Build CP for Perform Subsystem Function - SSC.
1884  */
1885 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1886                                                     int enable_pav)
1887 {
1888         struct dasd_ccw_req *cqr;
1889         struct dasd_psf_ssc_data *psf_ssc_data;
1890         struct ccw1 *ccw;
1891
1892         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1893                                   sizeof(struct dasd_psf_ssc_data),
1894                                    device, NULL);
1895
1896         if (IS_ERR(cqr)) {
1897                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1898                            "Could not allocate PSF-SSC request");
1899                 return cqr;
1900         }
1901         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1902         psf_ssc_data->order = PSF_ORDER_SSC;
1903         psf_ssc_data->suborder = 0xc0;
1904         if (enable_pav) {
1905                 psf_ssc_data->suborder |= 0x08;
1906                 psf_ssc_data->reserved[0] = 0x88;
1907         }
1908         ccw = cqr->cpaddr;
1909         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1910         ccw->cda = (__u32)virt_to_phys(psf_ssc_data);
1911         ccw->count = 66;
1912
1913         cqr->startdev = device;
1914         cqr->memdev = device;
1915         cqr->block = NULL;
1916         cqr->retries = 256;
1917         cqr->expires = 10*HZ;
1918         cqr->buildclk = get_tod_clock();
1919         cqr->status = DASD_CQR_FILLED;
1920         return cqr;
1921 }
1922
1923 /*
1924  * Perform Subsystem Function.
1925  * It is necessary to trigger CIO for channel revalidation since this
1926  * call might change behaviour of DASD devices.
1927  */
1928 static int
1929 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1930                   unsigned long flags)
1931 {
1932         struct dasd_ccw_req *cqr;
1933         int rc;
1934
1935         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1936         if (IS_ERR(cqr))
1937                 return PTR_ERR(cqr);
1938
1939         /*
1940          * set flags e.g. turn on failfast, to prevent blocking
1941          * the calling function should handle failed requests
1942          */
1943         cqr->flags |= flags;
1944
1945         rc = dasd_sleep_on(cqr);
1946         if (!rc)
1947                 /* trigger CIO to reprobe devices */
1948                 css_schedule_reprobe();
1949         else if (cqr->intrc == -EAGAIN)
1950                 rc = -EAGAIN;
1951
1952         dasd_sfree_request(cqr, cqr->memdev);
1953         return rc;
1954 }
1955
1956 /*
1957  * Valide storage server of current device.
1958  */
1959 static int dasd_eckd_validate_server(struct dasd_device *device,
1960                                      unsigned long flags)
1961 {
1962         struct dasd_eckd_private *private = device->private;
1963         int enable_pav, rc;
1964
1965         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1966             private->uid.type == UA_HYPER_PAV_ALIAS)
1967                 return 0;
1968         if (dasd_nopav || MACHINE_IS_VM)
1969                 enable_pav = 0;
1970         else
1971                 enable_pav = 1;
1972         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1973
1974         /* may be requested feature is not available on server,
1975          * therefore just report error and go ahead */
1976         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1977                         "returned rc=%d", private->uid.ssid, rc);
1978         return rc;
1979 }
1980
1981 /*
1982  * worker to do a validate server in case of a lost pathgroup
1983  */
1984 static void dasd_eckd_do_validate_server(struct work_struct *work)
1985 {
1986         struct dasd_device *device = container_of(work, struct dasd_device,
1987                                                   kick_validate);
1988         unsigned long flags = 0;
1989
1990         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1991         if (dasd_eckd_validate_server(device, flags)
1992             == -EAGAIN) {
1993                 /* schedule worker again if failed */
1994                 schedule_work(&device->kick_validate);
1995                 return;
1996         }
1997
1998         dasd_put_device(device);
1999 }
2000
2001 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
2002 {
2003         dasd_get_device(device);
2004         /* exit if device not online or in offline processing */
2005         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
2006            device->state < DASD_STATE_ONLINE) {
2007                 dasd_put_device(device);
2008                 return;
2009         }
2010         /* queue call to do_validate_server to the kernel event daemon. */
2011         if (!schedule_work(&device->kick_validate))
2012                 dasd_put_device(device);
2013 }
2014
2015 /*
2016  * return if the device is the copy relation primary if a copy relation is active
2017  */
2018 static int dasd_device_is_primary(struct dasd_device *device)
2019 {
2020         if (!device->copy)
2021                 return 1;
2022
2023         if (device->copy->active->device == device)
2024                 return 1;
2025
2026         return 0;
2027 }
2028
2029 static int dasd_eckd_alloc_block(struct dasd_device *device)
2030 {
2031         struct dasd_block *block;
2032         struct dasd_uid temp_uid;
2033
2034         if (!dasd_device_is_primary(device))
2035                 return 0;
2036
2037         dasd_eckd_get_uid(device, &temp_uid);
2038         if (temp_uid.type == UA_BASE_DEVICE) {
2039                 block = dasd_alloc_block();
2040                 if (IS_ERR(block)) {
2041                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2042                                         "could not allocate dasd block structure");
2043                         return PTR_ERR(block);
2044                 }
2045                 device->block = block;
2046                 block->base = device;
2047         }
2048         return 0;
2049 }
2050
2051 static bool dasd_eckd_pprc_enabled(struct dasd_device *device)
2052 {
2053         struct dasd_eckd_private *private = device->private;
2054
2055         return private->rdc_data.facilities.PPRC_enabled;
2056 }
2057
2058 /*
2059  * Check device characteristics.
2060  * If the device is accessible using ECKD discipline, the device is enabled.
2061  */
2062 static int
2063 dasd_eckd_check_characteristics(struct dasd_device *device)
2064 {
2065         struct dasd_eckd_private *private = device->private;
2066         int rc, i;
2067         int readonly;
2068         unsigned long value;
2069
2070         /* setup work queue for validate server*/
2071         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
2072         /* setup work queue for summary unit check */
2073         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
2074
2075         if (!ccw_device_is_pathgroup(device->cdev)) {
2076                 dev_warn(&device->cdev->dev,
2077                          "A channel path group could not be established\n");
2078                 return -EIO;
2079         }
2080         if (!ccw_device_is_multipath(device->cdev)) {
2081                 dev_info(&device->cdev->dev,
2082                          "The DASD is not operating in multipath mode\n");
2083         }
2084         if (!private) {
2085                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2086                 if (!private) {
2087                         dev_warn(&device->cdev->dev,
2088                                  "Allocating memory for private DASD data "
2089                                  "failed\n");
2090                         return -ENOMEM;
2091                 }
2092                 device->private = private;
2093         } else {
2094                 memset(private, 0, sizeof(*private));
2095         }
2096         /* Invalidate status of initial analysis. */
2097         private->init_cqr_status = -1;
2098         /* Set default cache operations. */
2099         private->attrib.operation = DASD_NORMAL_CACHE;
2100         private->attrib.nr_cyl = 0;
2101
2102         /* Read Configuration Data */
2103         rc = dasd_eckd_read_conf(device);
2104         if (rc)
2105                 goto out_err1;
2106
2107         /* set some default values */
2108         device->default_expires = DASD_EXPIRES;
2109         device->default_retries = DASD_RETRIES;
2110         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2111         device->path_interval = DASD_ECKD_PATH_INTERVAL;
2112
2113         if (private->conf.gneq) {
2114                 value = 1;
2115                 for (i = 0; i < private->conf.gneq->timeout.value; i++)
2116                         value = 10 * value;
2117                 value = value * private->conf.gneq->timeout.number;
2118                 /* do not accept useless values */
2119                 if (value != 0 && value <= DASD_EXPIRES_MAX)
2120                         device->default_expires = value;
2121         }
2122
2123         /* Read Device Characteristics */
2124         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2125                                          &private->rdc_data, 64);
2126         if (rc) {
2127                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2128                                 "Read device characteristic failed, rc=%d", rc);
2129                 goto out_err1;
2130         }
2131
2132         /* setup PPRC for device from devmap */
2133         rc = dasd_devmap_set_device_copy_relation(device->cdev,
2134                                                   dasd_eckd_pprc_enabled(device));
2135         if (rc) {
2136                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2137                                 "copy relation setup failed, rc=%d", rc);
2138                 goto out_err1;
2139         }
2140
2141         /* check if block device is needed and allocate in case */
2142         rc = dasd_eckd_alloc_block(device);
2143         if (rc)
2144                 goto out_err1;
2145
2146         /* register lcu with alias handling, enable PAV */
2147         rc = dasd_alias_make_device_known_to_lcu(device);
2148         if (rc)
2149                 goto out_err2;
2150
2151         dasd_eckd_validate_server(device, 0);
2152
2153         /* device may report different configuration data after LCU setup */
2154         rc = dasd_eckd_read_conf(device);
2155         if (rc)
2156                 goto out_err3;
2157
2158         dasd_eckd_read_fc_security(device);
2159         dasd_path_create_kobjects(device);
2160
2161         /* Read Feature Codes */
2162         dasd_eckd_read_features(device);
2163
2164         /* Read Volume Information */
2165         dasd_eckd_read_vol_info(device);
2166
2167         /* Read Extent Pool Information */
2168         dasd_eckd_read_ext_pool_info(device);
2169
2170         if ((device->features & DASD_FEATURE_USERAW) &&
2171             !(private->rdc_data.facilities.RT_in_LR)) {
2172                 dev_err(&device->cdev->dev, "The storage server does not "
2173                         "support raw-track access\n");
2174                 rc = -EINVAL;
2175                 goto out_err3;
2176         }
2177
2178         /* find the valid cylinder size */
2179         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2180             private->rdc_data.long_no_cyl)
2181                 private->real_cyl = private->rdc_data.long_no_cyl;
2182         else
2183                 private->real_cyl = private->rdc_data.no_cyl;
2184
2185         private->fcx_max_data = get_fcx_max_data(device);
2186
2187         readonly = dasd_device_is_ro(device);
2188         if (readonly)
2189                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2190
2191         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2192                  "with %d cylinders, %d heads, %d sectors%s\n",
2193                  private->rdc_data.dev_type,
2194                  private->rdc_data.dev_model,
2195                  private->rdc_data.cu_type,
2196                  private->rdc_data.cu_model.model,
2197                  private->real_cyl,
2198                  private->rdc_data.trk_per_cyl,
2199                  private->rdc_data.sec_per_trk,
2200                  readonly ? ", read-only device" : "");
2201         return 0;
2202
2203 out_err3:
2204         dasd_alias_disconnect_device_from_lcu(device);
2205 out_err2:
2206         dasd_free_block(device->block);
2207         device->block = NULL;
2208 out_err1:
2209         dasd_eckd_clear_conf_data(device);
2210         dasd_path_remove_kobjects(device);
2211         kfree(device->private);
2212         device->private = NULL;
2213         return rc;
2214 }
2215
2216 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2217 {
2218         struct dasd_eckd_private *private = device->private;
2219
2220         if (!private)
2221                 return;
2222
2223         dasd_alias_disconnect_device_from_lcu(device);
2224         private->conf.ned = NULL;
2225         private->conf.sneq = NULL;
2226         private->conf.vdsneq = NULL;
2227         private->conf.gneq = NULL;
2228         dasd_eckd_clear_conf_data(device);
2229         dasd_path_remove_kobjects(device);
2230 }
2231
2232 static struct dasd_ccw_req *
2233 dasd_eckd_analysis_ccw(struct dasd_device *device)
2234 {
2235         struct dasd_eckd_private *private = device->private;
2236         struct eckd_count *count_data;
2237         struct LO_eckd_data *LO_data;
2238         struct dasd_ccw_req *cqr;
2239         struct ccw1 *ccw;
2240         int cplength, datasize;
2241         int i;
2242
2243         cplength = 8;
2244         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2245         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2246                                    NULL);
2247         if (IS_ERR(cqr))
2248                 return cqr;
2249         ccw = cqr->cpaddr;
2250         /* Define extent for the first 2 tracks. */
2251         define_extent(ccw++, cqr->data, 0, 1,
2252                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2253         LO_data = cqr->data + sizeof(struct DE_eckd_data);
2254         /* Locate record for the first 4 records on track 0. */
2255         ccw[-1].flags |= CCW_FLAG_CC;
2256         locate_record(ccw++, LO_data++, 0, 0, 4,
2257                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2258
2259         count_data = private->count_area;
2260         for (i = 0; i < 4; i++) {
2261                 ccw[-1].flags |= CCW_FLAG_CC;
2262                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2263                 ccw->flags = 0;
2264                 ccw->count = 8;
2265                 ccw->cda = (__u32)virt_to_phys(count_data);
2266                 ccw++;
2267                 count_data++;
2268         }
2269
2270         /* Locate record for the first record on track 1. */
2271         ccw[-1].flags |= CCW_FLAG_CC;
2272         locate_record(ccw++, LO_data++, 1, 0, 1,
2273                       DASD_ECKD_CCW_READ_COUNT, device, 0);
2274         /* Read count ccw. */
2275         ccw[-1].flags |= CCW_FLAG_CC;
2276         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2277         ccw->flags = 0;
2278         ccw->count = 8;
2279         ccw->cda = (__u32)virt_to_phys(count_data);
2280
2281         cqr->block = NULL;
2282         cqr->startdev = device;
2283         cqr->memdev = device;
2284         cqr->retries = 255;
2285         cqr->buildclk = get_tod_clock();
2286         cqr->status = DASD_CQR_FILLED;
2287         /* Set flags to suppress output for expected errors */
2288         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2289
2290         return cqr;
2291 }
2292
2293 /* differentiate between 'no record found' and any other error */
2294 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2295 {
2296         char *sense;
2297         if (init_cqr->status == DASD_CQR_DONE)
2298                 return INIT_CQR_OK;
2299         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2300                  init_cqr->status == DASD_CQR_FAILED) {
2301                 sense = dasd_get_sense(&init_cqr->irb);
2302                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2303                         return INIT_CQR_UNFORMATTED;
2304                 else
2305                         return INIT_CQR_ERROR;
2306         } else
2307                 return INIT_CQR_ERROR;
2308 }
2309
2310 /*
2311  * This is the callback function for the init_analysis cqr. It saves
2312  * the status of the initial analysis ccw before it frees it and kicks
2313  * the device to continue the startup sequence. This will call
2314  * dasd_eckd_do_analysis again (if the devices has not been marked
2315  * for deletion in the meantime).
2316  */
2317 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2318                                         void *data)
2319 {
2320         struct dasd_device *device = init_cqr->startdev;
2321         struct dasd_eckd_private *private = device->private;
2322
2323         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2324         dasd_sfree_request(init_cqr, device);
2325         dasd_kick_device(device);
2326 }
2327
2328 static int dasd_eckd_start_analysis(struct dasd_block *block)
2329 {
2330         struct dasd_ccw_req *init_cqr;
2331
2332         init_cqr = dasd_eckd_analysis_ccw(block->base);
2333         if (IS_ERR(init_cqr))
2334                 return PTR_ERR(init_cqr);
2335         init_cqr->callback = dasd_eckd_analysis_callback;
2336         init_cqr->callback_data = NULL;
2337         init_cqr->expires = 5*HZ;
2338         /* first try without ERP, so we can later handle unformatted
2339          * devices as special case
2340          */
2341         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2342         init_cqr->retries = 0;
2343         dasd_add_request_head(init_cqr);
2344         return -EAGAIN;
2345 }
2346
2347 static int dasd_eckd_end_analysis(struct dasd_block *block)
2348 {
2349         struct dasd_device *device = block->base;
2350         struct dasd_eckd_private *private = device->private;
2351         struct eckd_count *count_area;
2352         unsigned int sb, blk_per_trk;
2353         int status, i;
2354         struct dasd_ccw_req *init_cqr;
2355
2356         status = private->init_cqr_status;
2357         private->init_cqr_status = -1;
2358         if (status == INIT_CQR_ERROR) {
2359                 /* try again, this time with full ERP */
2360                 init_cqr = dasd_eckd_analysis_ccw(device);
2361                 dasd_sleep_on(init_cqr);
2362                 status = dasd_eckd_analysis_evaluation(init_cqr);
2363                 dasd_sfree_request(init_cqr, device);
2364         }
2365
2366         if (device->features & DASD_FEATURE_USERAW) {
2367                 block->bp_block = DASD_RAW_BLOCKSIZE;
2368                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2369                 block->s2b_shift = 3;
2370                 goto raw;
2371         }
2372
2373         if (status == INIT_CQR_UNFORMATTED) {
2374                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2375                 return -EMEDIUMTYPE;
2376         } else if (status == INIT_CQR_ERROR) {
2377                 dev_err(&device->cdev->dev,
2378                         "Detecting the DASD disk layout failed because "
2379                         "of an I/O error\n");
2380                 return -EIO;
2381         }
2382
2383         private->uses_cdl = 1;
2384         /* Check Track 0 for Compatible Disk Layout */
2385         count_area = NULL;
2386         for (i = 0; i < 3; i++) {
2387                 if (private->count_area[i].kl != 4 ||
2388                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2389                     private->count_area[i].cyl != 0 ||
2390                     private->count_area[i].head != count_area_head[i] ||
2391                     private->count_area[i].record != count_area_rec[i]) {
2392                         private->uses_cdl = 0;
2393                         break;
2394                 }
2395         }
2396         if (i == 3)
2397                 count_area = &private->count_area[3];
2398
2399         if (private->uses_cdl == 0) {
2400                 for (i = 0; i < 5; i++) {
2401                         if ((private->count_area[i].kl != 0) ||
2402                             (private->count_area[i].dl !=
2403                              private->count_area[0].dl) ||
2404                             private->count_area[i].cyl !=  0 ||
2405                             private->count_area[i].head != count_area_head[i] ||
2406                             private->count_area[i].record != count_area_rec[i])
2407                                 break;
2408                 }
2409                 if (i == 5)
2410                         count_area = &private->count_area[0];
2411         } else {
2412                 if (private->count_area[3].record == 1)
2413                         dev_warn(&device->cdev->dev,
2414                                  "Track 0 has no records following the VTOC\n");
2415         }
2416
2417         if (count_area != NULL && count_area->kl == 0) {
2418                 /* we found notthing violating our disk layout */
2419                 if (dasd_check_blocksize(count_area->dl) == 0)
2420                         block->bp_block = count_area->dl;
2421         }
2422         if (block->bp_block == 0) {
2423                 dev_warn(&device->cdev->dev,
2424                          "The disk layout of the DASD is not supported\n");
2425                 return -EMEDIUMTYPE;
2426         }
2427         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2428         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2429                 block->s2b_shift++;
2430
2431         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2432
2433 raw:
2434         block->blocks = ((unsigned long) private->real_cyl *
2435                           private->rdc_data.trk_per_cyl *
2436                           blk_per_trk);
2437
2438         dev_info(&device->cdev->dev,
2439                  "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2440                  "%s\n", (block->bp_block >> 10),
2441                  (((unsigned long) private->real_cyl *
2442                    private->rdc_data.trk_per_cyl *
2443                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2444                  ((blk_per_trk * block->bp_block) >> 10),
2445                  private->uses_cdl ?
2446                  "compatible disk layout" : "linux disk layout");
2447
2448         return 0;
2449 }
2450
2451 static int dasd_eckd_do_analysis(struct dasd_block *block)
2452 {
2453         struct dasd_eckd_private *private = block->base->private;
2454
2455         if (private->init_cqr_status < 0)
2456                 return dasd_eckd_start_analysis(block);
2457         else
2458                 return dasd_eckd_end_analysis(block);
2459 }
2460
2461 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2462 {
2463         return dasd_alias_add_device(device);
2464 };
2465
2466 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2467 {
2468         if (cancel_work_sync(&device->reload_device))
2469                 dasd_put_device(device);
2470         if (cancel_work_sync(&device->kick_validate))
2471                 dasd_put_device(device);
2472
2473         return 0;
2474 };
2475
2476 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2477 {
2478         return dasd_alias_remove_device(device);
2479 };
2480
2481 static int
2482 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2483 {
2484         struct dasd_eckd_private *private = block->base->private;
2485
2486         if (dasd_check_blocksize(block->bp_block) == 0) {
2487                 geo->sectors = recs_per_track(&private->rdc_data,
2488                                               0, block->bp_block);
2489         }
2490         geo->cylinders = private->rdc_data.no_cyl;
2491         geo->heads = private->rdc_data.trk_per_cyl;
2492         return 0;
2493 }
2494
2495 /*
2496  * Build the TCW request for the format check
2497  */
2498 static struct dasd_ccw_req *
2499 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2500                           int enable_pav, struct eckd_count *fmt_buffer,
2501                           int rpt)
2502 {
2503         struct dasd_eckd_private *start_priv;
2504         struct dasd_device *startdev = NULL;
2505         struct tidaw *last_tidaw = NULL;
2506         struct dasd_ccw_req *cqr;
2507         struct itcw *itcw;
2508         int itcw_size;
2509         int count;
2510         int rc;
2511         int i;
2512
2513         if (enable_pav)
2514                 startdev = dasd_alias_get_start_dev(base);
2515
2516         if (!startdev)
2517                 startdev = base;
2518
2519         start_priv = startdev->private;
2520
2521         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2522
2523         /*
2524          * we're adding 'count' amount of tidaw to the itcw.
2525          * calculate the corresponding itcw_size
2526          */
2527         itcw_size = itcw_calc_size(0, count, 0);
2528
2529         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2530         if (IS_ERR(cqr))
2531                 return cqr;
2532
2533         start_priv->count++;
2534
2535         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2536         if (IS_ERR(itcw)) {
2537                 rc = -EINVAL;
2538                 goto out_err;
2539         }
2540
2541         cqr->cpaddr = itcw_get_tcw(itcw);
2542         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2543                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2544                           sizeof(struct eckd_count),
2545                           count * sizeof(struct eckd_count), 0, rpt);
2546         if (rc)
2547                 goto out_err;
2548
2549         for (i = 0; i < count; i++) {
2550                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2551                                             sizeof(struct eckd_count));
2552                 if (IS_ERR(last_tidaw)) {
2553                         rc = -EINVAL;
2554                         goto out_err;
2555                 }
2556         }
2557
2558         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2559         itcw_finalize(itcw);
2560
2561         cqr->cpmode = 1;
2562         cqr->startdev = startdev;
2563         cqr->memdev = startdev;
2564         cqr->basedev = base;
2565         cqr->retries = startdev->default_retries;
2566         cqr->expires = startdev->default_expires * HZ;
2567         cqr->buildclk = get_tod_clock();
2568         cqr->status = DASD_CQR_FILLED;
2569         /* Set flags to suppress output for expected errors */
2570         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2571         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2572
2573         return cqr;
2574
2575 out_err:
2576         dasd_sfree_request(cqr, startdev);
2577
2578         return ERR_PTR(rc);
2579 }
2580
2581 /*
2582  * Build the CCW request for the format check
2583  */
2584 static struct dasd_ccw_req *
2585 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2586                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2587 {
2588         struct dasd_eckd_private *start_priv;
2589         struct dasd_eckd_private *base_priv;
2590         struct dasd_device *startdev = NULL;
2591         struct dasd_ccw_req *cqr;
2592         struct ccw1 *ccw;
2593         void *data;
2594         int cplength, datasize;
2595         int use_prefix;
2596         int count;
2597         int i;
2598
2599         if (enable_pav)
2600                 startdev = dasd_alias_get_start_dev(base);
2601
2602         if (!startdev)
2603                 startdev = base;
2604
2605         start_priv = startdev->private;
2606         base_priv = base->private;
2607
2608         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2609
2610         use_prefix = base_priv->features.feature[8] & 0x01;
2611
2612         if (use_prefix) {
2613                 cplength = 1;
2614                 datasize = sizeof(struct PFX_eckd_data);
2615         } else {
2616                 cplength = 2;
2617                 datasize = sizeof(struct DE_eckd_data) +
2618                         sizeof(struct LO_eckd_data);
2619         }
2620         cplength += count;
2621
2622         cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2623         if (IS_ERR(cqr))
2624                 return cqr;
2625
2626         start_priv->count++;
2627         data = cqr->data;
2628         ccw = cqr->cpaddr;
2629
2630         if (use_prefix) {
2631                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2632                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2633                            count, 0, 0);
2634         } else {
2635                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2636                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2637
2638                 data += sizeof(struct DE_eckd_data);
2639                 ccw[-1].flags |= CCW_FLAG_CC;
2640
2641                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2642                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2643         }
2644
2645         for (i = 0; i < count; i++) {
2646                 ccw[-1].flags |= CCW_FLAG_CC;
2647                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2648                 ccw->flags = CCW_FLAG_SLI;
2649                 ccw->count = 8;
2650                 ccw->cda = (__u32)virt_to_phys(fmt_buffer);
2651                 ccw++;
2652                 fmt_buffer++;
2653         }
2654
2655         cqr->startdev = startdev;
2656         cqr->memdev = startdev;
2657         cqr->basedev = base;
2658         cqr->retries = DASD_RETRIES;
2659         cqr->expires = startdev->default_expires * HZ;
2660         cqr->buildclk = get_tod_clock();
2661         cqr->status = DASD_CQR_FILLED;
2662         /* Set flags to suppress output for expected errors */
2663         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2664
2665         return cqr;
2666 }
2667
2668 static struct dasd_ccw_req *
2669 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2670                        struct format_data_t *fdata, int enable_pav)
2671 {
2672         struct dasd_eckd_private *base_priv;
2673         struct dasd_eckd_private *start_priv;
2674         struct dasd_ccw_req *fcp;
2675         struct eckd_count *ect;
2676         struct ch_t address;
2677         struct ccw1 *ccw;
2678         void *data;
2679         int rpt;
2680         int cplength, datasize;
2681         int i, j;
2682         int intensity = 0;
2683         int r0_perm;
2684         int nr_tracks;
2685         int use_prefix;
2686
2687         if (enable_pav)
2688                 startdev = dasd_alias_get_start_dev(base);
2689
2690         if (!startdev)
2691                 startdev = base;
2692
2693         start_priv = startdev->private;
2694         base_priv = base->private;
2695
2696         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2697
2698         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2699
2700         /*
2701          * fdata->intensity is a bit string that tells us what to do:
2702          *   Bit 0: write record zero
2703          *   Bit 1: write home address, currently not supported
2704          *   Bit 2: invalidate tracks
2705          *   Bit 3: use OS/390 compatible disk layout (cdl)
2706          *   Bit 4: do not allow storage subsystem to modify record zero
2707          * Only some bit combinations do make sense.
2708          */
2709         if (fdata->intensity & 0x10) {
2710                 r0_perm = 0;
2711                 intensity = fdata->intensity & ~0x10;
2712         } else {
2713                 r0_perm = 1;
2714                 intensity = fdata->intensity;
2715         }
2716
2717         use_prefix = base_priv->features.feature[8] & 0x01;
2718
2719         switch (intensity) {
2720         case 0x00:      /* Normal format */
2721         case 0x08:      /* Normal format, use cdl. */
2722                 cplength = 2 + (rpt*nr_tracks);
2723                 if (use_prefix)
2724                         datasize = sizeof(struct PFX_eckd_data) +
2725                                 sizeof(struct LO_eckd_data) +
2726                                 rpt * nr_tracks * sizeof(struct eckd_count);
2727                 else
2728                         datasize = sizeof(struct DE_eckd_data) +
2729                                 sizeof(struct LO_eckd_data) +
2730                                 rpt * nr_tracks * sizeof(struct eckd_count);
2731                 break;
2732         case 0x01:      /* Write record zero and format track. */
2733         case 0x09:      /* Write record zero and format track, use cdl. */
2734                 cplength = 2 + rpt * nr_tracks;
2735                 if (use_prefix)
2736                         datasize = sizeof(struct PFX_eckd_data) +
2737                                 sizeof(struct LO_eckd_data) +
2738                                 sizeof(struct eckd_count) +
2739                                 rpt * nr_tracks * sizeof(struct eckd_count);
2740                 else
2741                         datasize = sizeof(struct DE_eckd_data) +
2742                                 sizeof(struct LO_eckd_data) +
2743                                 sizeof(struct eckd_count) +
2744                                 rpt * nr_tracks * sizeof(struct eckd_count);
2745                 break;
2746         case 0x04:      /* Invalidate track. */
2747         case 0x0c:      /* Invalidate track, use cdl. */
2748                 cplength = 3;
2749                 if (use_prefix)
2750                         datasize = sizeof(struct PFX_eckd_data) +
2751                                 sizeof(struct LO_eckd_data) +
2752                                 sizeof(struct eckd_count);
2753                 else
2754                         datasize = sizeof(struct DE_eckd_data) +
2755                                 sizeof(struct LO_eckd_data) +
2756                                 sizeof(struct eckd_count);
2757                 break;
2758         default:
2759                 dev_warn(&startdev->cdev->dev,
2760                          "An I/O control call used incorrect flags 0x%x\n",
2761                          fdata->intensity);
2762                 return ERR_PTR(-EINVAL);
2763         }
2764
2765         fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2766         if (IS_ERR(fcp))
2767                 return fcp;
2768
2769         start_priv->count++;
2770         data = fcp->data;
2771         ccw = fcp->cpaddr;
2772
2773         switch (intensity & ~0x08) {
2774         case 0x00: /* Normal format. */
2775                 if (use_prefix) {
2776                         prefix(ccw++, (struct PFX_eckd_data *) data,
2777                                fdata->start_unit, fdata->stop_unit,
2778                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2779                         /* grant subsystem permission to format R0 */
2780                         if (r0_perm)
2781                                 ((struct PFX_eckd_data *)data)
2782                                         ->define_extent.ga_extended |= 0x04;
2783                         data += sizeof(struct PFX_eckd_data);
2784                 } else {
2785                         define_extent(ccw++, (struct DE_eckd_data *) data,
2786                                       fdata->start_unit, fdata->stop_unit,
2787                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2788                         /* grant subsystem permission to format R0 */
2789                         if (r0_perm)
2790                                 ((struct DE_eckd_data *) data)
2791                                         ->ga_extended |= 0x04;
2792                         data += sizeof(struct DE_eckd_data);
2793                 }
2794                 ccw[-1].flags |= CCW_FLAG_CC;
2795                 locate_record(ccw++, (struct LO_eckd_data *) data,
2796                               fdata->start_unit, 0, rpt*nr_tracks,
2797                               DASD_ECKD_CCW_WRITE_CKD, base,
2798                               fdata->blksize);
2799                 data += sizeof(struct LO_eckd_data);
2800                 break;
2801         case 0x01: /* Write record zero + format track. */
2802                 if (use_prefix) {
2803                         prefix(ccw++, (struct PFX_eckd_data *) data,
2804                                fdata->start_unit, fdata->stop_unit,
2805                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2806                                base, startdev);
2807                         data += sizeof(struct PFX_eckd_data);
2808                 } else {
2809                         define_extent(ccw++, (struct DE_eckd_data *) data,
2810                                fdata->start_unit, fdata->stop_unit,
2811                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2812                         data += sizeof(struct DE_eckd_data);
2813                 }
2814                 ccw[-1].flags |= CCW_FLAG_CC;
2815                 locate_record(ccw++, (struct LO_eckd_data *) data,
2816                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2817                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2818                               base->block->bp_block);
2819                 data += sizeof(struct LO_eckd_data);
2820                 break;
2821         case 0x04: /* Invalidate track. */
2822                 if (use_prefix) {
2823                         prefix(ccw++, (struct PFX_eckd_data *) data,
2824                                fdata->start_unit, fdata->stop_unit,
2825                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2826                         data += sizeof(struct PFX_eckd_data);
2827                 } else {
2828                         define_extent(ccw++, (struct DE_eckd_data *) data,
2829                                fdata->start_unit, fdata->stop_unit,
2830                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2831                         data += sizeof(struct DE_eckd_data);
2832                 }
2833                 ccw[-1].flags |= CCW_FLAG_CC;
2834                 locate_record(ccw++, (struct LO_eckd_data *) data,
2835                               fdata->start_unit, 0, 1,
2836                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2837                 data += sizeof(struct LO_eckd_data);
2838                 break;
2839         }
2840
2841         for (j = 0; j < nr_tracks; j++) {
2842                 /* calculate cylinder and head for the current track */
2843                 set_ch_t(&address,
2844                          (fdata->start_unit + j) /
2845                          base_priv->rdc_data.trk_per_cyl,
2846                          (fdata->start_unit + j) %
2847                          base_priv->rdc_data.trk_per_cyl);
2848                 if (intensity & 0x01) { /* write record zero */
2849                         ect = (struct eckd_count *) data;
2850                         data += sizeof(struct eckd_count);
2851                         ect->cyl = address.cyl;
2852                         ect->head = address.head;
2853                         ect->record = 0;
2854                         ect->kl = 0;
2855                         ect->dl = 8;
2856                         ccw[-1].flags |= CCW_FLAG_CC;
2857                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2858                         ccw->flags = CCW_FLAG_SLI;
2859                         ccw->count = 8;
2860                         ccw->cda = (__u32)virt_to_phys(ect);
2861                         ccw++;
2862                 }
2863                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2864                         ect = (struct eckd_count *) data;
2865                         data += sizeof(struct eckd_count);
2866                         ect->cyl = address.cyl;
2867                         ect->head = address.head;
2868                         ect->record = 1;
2869                         ect->kl = 0;
2870                         ect->dl = 0;
2871                         ccw[-1].flags |= CCW_FLAG_CC;
2872                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2873                         ccw->flags = CCW_FLAG_SLI;
2874                         ccw->count = 8;
2875                         ccw->cda = (__u32)virt_to_phys(ect);
2876                 } else {                /* write remaining records */
2877                         for (i = 0; i < rpt; i++) {
2878                                 ect = (struct eckd_count *) data;
2879                                 data += sizeof(struct eckd_count);
2880                                 ect->cyl = address.cyl;
2881                                 ect->head = address.head;
2882                                 ect->record = i + 1;
2883                                 ect->kl = 0;
2884                                 ect->dl = fdata->blksize;
2885                                 /*
2886                                  * Check for special tracks 0-1
2887                                  * when formatting CDL
2888                                  */
2889                                 if ((intensity & 0x08) &&
2890                                     address.cyl == 0 && address.head == 0) {
2891                                         if (i < 3) {
2892                                                 ect->kl = 4;
2893                                                 ect->dl = sizes_trk0[i] - 4;
2894                                         }
2895                                 }
2896                                 if ((intensity & 0x08) &&
2897                                     address.cyl == 0 && address.head == 1) {
2898                                         ect->kl = 44;
2899                                         ect->dl = LABEL_SIZE - 44;
2900                                 }
2901                                 ccw[-1].flags |= CCW_FLAG_CC;
2902                                 if (i != 0 || j == 0)
2903                                         ccw->cmd_code =
2904                                                 DASD_ECKD_CCW_WRITE_CKD;
2905                                 else
2906                                         ccw->cmd_code =
2907                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2908                                 ccw->flags = CCW_FLAG_SLI;
2909                                 ccw->count = 8;
2910                                 ccw->cda = (__u32)virt_to_phys(ect);
2911                                 ccw++;
2912                         }
2913                 }
2914         }
2915
2916         fcp->startdev = startdev;
2917         fcp->memdev = startdev;
2918         fcp->basedev = base;
2919         fcp->retries = 256;
2920         fcp->expires = startdev->default_expires * HZ;
2921         fcp->buildclk = get_tod_clock();
2922         fcp->status = DASD_CQR_FILLED;
2923
2924         return fcp;
2925 }
2926
2927 /*
2928  * Wrapper function to build a CCW request depending on input data
2929  */
2930 static struct dasd_ccw_req *
2931 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2932                                struct format_data_t *fdata, int enable_pav,
2933                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2934 {
2935         struct dasd_ccw_req *ccw_req;
2936
2937         if (!fmt_buffer) {
2938                 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2939         } else {
2940                 if (tpm)
2941                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2942                                                             enable_pav,
2943                                                             fmt_buffer, rpt);
2944                 else
2945                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2946                                                         fmt_buffer, rpt);
2947         }
2948
2949         return ccw_req;
2950 }
2951
2952 /*
2953  * Sanity checks on format_data
2954  */
2955 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2956                                           struct format_data_t *fdata)
2957 {
2958         struct dasd_eckd_private *private = base->private;
2959
2960         if (fdata->start_unit >=
2961             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2962                 dev_warn(&base->cdev->dev,
2963                          "Start track number %u used in formatting is too big\n",
2964                          fdata->start_unit);
2965                 return -EINVAL;
2966         }
2967         if (fdata->stop_unit >=
2968             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2969                 dev_warn(&base->cdev->dev,
2970                          "Stop track number %u used in formatting is too big\n",
2971                          fdata->stop_unit);
2972                 return -EINVAL;
2973         }
2974         if (fdata->start_unit > fdata->stop_unit) {
2975                 dev_warn(&base->cdev->dev,
2976                          "Start track %u used in formatting exceeds end track\n",
2977                          fdata->start_unit);
2978                 return -EINVAL;
2979         }
2980         if (dasd_check_blocksize(fdata->blksize) != 0) {
2981                 dev_warn(&base->cdev->dev,
2982                          "The DASD cannot be formatted with block size %u\n",
2983                          fdata->blksize);
2984                 return -EINVAL;
2985         }
2986         return 0;
2987 }
2988
2989 /*
2990  * This function will process format_data originally coming from an IOCTL
2991  */
2992 static int dasd_eckd_format_process_data(struct dasd_device *base,
2993                                          struct format_data_t *fdata,
2994                                          int enable_pav, int tpm,
2995                                          struct eckd_count *fmt_buffer, int rpt,
2996                                          struct irb *irb)
2997 {
2998         struct dasd_eckd_private *private = base->private;
2999         struct dasd_ccw_req *cqr, *n;
3000         struct list_head format_queue;
3001         struct dasd_device *device;
3002         char *sense = NULL;
3003         int old_start, old_stop, format_step;
3004         int step, retry;
3005         int rc;
3006
3007         rc = dasd_eckd_format_sanity_checks(base, fdata);
3008         if (rc)
3009                 return rc;
3010
3011         INIT_LIST_HEAD(&format_queue);
3012
3013         old_start = fdata->start_unit;
3014         old_stop = fdata->stop_unit;
3015
3016         if (!tpm && fmt_buffer != NULL) {
3017                 /* Command Mode / Format Check */
3018                 format_step = 1;
3019         } else if (tpm && fmt_buffer != NULL) {
3020                 /* Transport Mode / Format Check */
3021                 format_step = DASD_CQR_MAX_CCW / rpt;
3022         } else {
3023                 /* Normal Formatting */
3024                 format_step = DASD_CQR_MAX_CCW /
3025                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
3026         }
3027
3028         do {
3029                 retry = 0;
3030                 while (fdata->start_unit <= old_stop) {
3031                         step = fdata->stop_unit - fdata->start_unit + 1;
3032                         if (step > format_step) {
3033                                 fdata->stop_unit =
3034                                         fdata->start_unit + format_step - 1;
3035                         }
3036
3037                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
3038                                                              enable_pav, tpm,
3039                                                              fmt_buffer, rpt);
3040                         if (IS_ERR(cqr)) {
3041                                 rc = PTR_ERR(cqr);
3042                                 if (rc == -ENOMEM) {
3043                                         if (list_empty(&format_queue))
3044                                                 goto out;
3045                                         /*
3046                                          * not enough memory available, start
3047                                          * requests retry after first requests
3048                                          * were finished
3049                                          */
3050                                         retry = 1;
3051                                         break;
3052                                 }
3053                                 goto out_err;
3054                         }
3055                         list_add_tail(&cqr->blocklist, &format_queue);
3056
3057                         if (fmt_buffer) {
3058                                 step = fdata->stop_unit - fdata->start_unit + 1;
3059                                 fmt_buffer += rpt * step;
3060                         }
3061                         fdata->start_unit = fdata->stop_unit + 1;
3062                         fdata->stop_unit = old_stop;
3063                 }
3064
3065                 rc = dasd_sleep_on_queue(&format_queue);
3066
3067 out_err:
3068                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
3069                         device = cqr->startdev;
3070                         private = device->private;
3071
3072                         if (cqr->status == DASD_CQR_FAILED) {
3073                                 /*
3074                                  * Only get sense data if called by format
3075                                  * check
3076                                  */
3077                                 if (fmt_buffer && irb) {
3078                                         sense = dasd_get_sense(&cqr->irb);
3079                                         memcpy(irb, &cqr->irb, sizeof(*irb));
3080                                 }
3081                                 rc = -EIO;
3082                         }
3083                         list_del_init(&cqr->blocklist);
3084                         dasd_ffree_request(cqr, device);
3085                         private->count--;
3086                 }
3087
3088                 if (rc && rc != -EIO)
3089                         goto out;
3090                 if (rc == -EIO) {
3091                         /*
3092                          * In case fewer than the expected records are on the
3093                          * track, we will most likely get a 'No Record Found'
3094                          * error (in command mode) or a 'File Protected' error
3095                          * (in transport mode). Those particular cases shouldn't
3096                          * pass the -EIO to the IOCTL, therefore reset the rc
3097                          * and continue.
3098                          */
3099                         if (sense &&
3100                             (sense[1] & SNS1_NO_REC_FOUND ||
3101                              sense[1] & SNS1_FILE_PROTECTED))
3102                                 retry = 1;
3103                         else
3104                                 goto out;
3105                 }
3106
3107         } while (retry);
3108
3109 out:
3110         fdata->start_unit = old_start;
3111         fdata->stop_unit = old_stop;
3112
3113         return rc;
3114 }
3115
3116 static int dasd_eckd_format_device(struct dasd_device *base,
3117                                    struct format_data_t *fdata, int enable_pav)
3118 {
3119         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3120                                              0, NULL);
3121 }
3122
3123 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3124                                       struct dasd_ccw_req *cqr)
3125 {
3126         struct dasd_block *block = cqr->block;
3127         struct dasd_format_entry *format;
3128         unsigned long flags;
3129         bool rc = false;
3130
3131         spin_lock_irqsave(&block->format_lock, flags);
3132         if (cqr->trkcount != atomic_read(&block->trkcount)) {
3133                 /*
3134                  * The number of formatted tracks has changed after request
3135                  * start and we can not tell if the current track was involved.
3136                  * To avoid data corruption treat it as if the current track is
3137                  * involved
3138                  */
3139                 rc = true;
3140                 goto out;
3141         }
3142         list_for_each_entry(format, &block->format_list, list) {
3143                 if (format->track == to_format->track) {
3144                         rc = true;
3145                         goto out;
3146                 }
3147         }
3148         list_add_tail(&to_format->list, &block->format_list);
3149
3150 out:
3151         spin_unlock_irqrestore(&block->format_lock, flags);
3152         return rc;
3153 }
3154
3155 static void clear_format_track(struct dasd_format_entry *format,
3156                               struct dasd_block *block)
3157 {
3158         unsigned long flags;
3159
3160         spin_lock_irqsave(&block->format_lock, flags);
3161         atomic_inc(&block->trkcount);
3162         list_del_init(&format->list);
3163         spin_unlock_irqrestore(&block->format_lock, flags);
3164 }
3165
3166 /*
3167  * Callback function to free ESE format requests.
3168  */
3169 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3170 {
3171         struct dasd_device *device = cqr->startdev;
3172         struct dasd_eckd_private *private = device->private;
3173         struct dasd_format_entry *format = data;
3174
3175         clear_format_track(format, cqr->basedev->block);
3176         private->count--;
3177         dasd_ffree_request(cqr, device);
3178 }
3179
3180 static struct dasd_ccw_req *
3181 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3182                      struct irb *irb)
3183 {
3184         struct dasd_eckd_private *private;
3185         struct dasd_format_entry *format;
3186         struct format_data_t fdata;
3187         unsigned int recs_per_trk;
3188         struct dasd_ccw_req *fcqr;
3189         struct dasd_device *base;
3190         struct dasd_block *block;
3191         unsigned int blksize;
3192         struct request *req;
3193         sector_t first_trk;
3194         sector_t last_trk;
3195         sector_t curr_trk;
3196         int rc;
3197
3198         req = dasd_get_callback_data(cqr);
3199         block = cqr->block;
3200         base = block->base;
3201         private = base->private;
3202         blksize = block->bp_block;
3203         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3204         format = &startdev->format_entry;
3205
3206         first_trk = blk_rq_pos(req) >> block->s2b_shift;
3207         sector_div(first_trk, recs_per_trk);
3208         last_trk =
3209                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3210         sector_div(last_trk, recs_per_trk);
3211         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3212         if (rc)
3213                 return ERR_PTR(rc);
3214
3215         if (curr_trk < first_trk || curr_trk > last_trk) {
3216                 DBF_DEV_EVENT(DBF_WARNING, startdev,
3217                               "ESE error track %llu not within range %llu - %llu\n",
3218                               curr_trk, first_trk, last_trk);
3219                 return ERR_PTR(-EINVAL);
3220         }
3221         format->track = curr_trk;
3222         /* test if track is already in formatting by another thread */
3223         if (test_and_set_format_track(format, cqr)) {
3224                 /* this is no real error so do not count down retries */
3225                 cqr->retries++;
3226                 return ERR_PTR(-EEXIST);
3227         }
3228
3229         fdata.start_unit = curr_trk;
3230         fdata.stop_unit = curr_trk;
3231         fdata.blksize = blksize;
3232         fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3233
3234         rc = dasd_eckd_format_sanity_checks(base, &fdata);
3235         if (rc)
3236                 return ERR_PTR(-EINVAL);
3237
3238         /*
3239          * We're building the request with PAV disabled as we're reusing
3240          * the former startdev.
3241          */
3242         fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3243         if (IS_ERR(fcqr))
3244                 return fcqr;
3245
3246         fcqr->callback = dasd_eckd_ese_format_cb;
3247         fcqr->callback_data = (void *) format;
3248
3249         return fcqr;
3250 }
3251
3252 /*
3253  * When data is read from an unformatted area of an ESE volume, this function
3254  * returns zeroed data and thereby mimics a read of zero data.
3255  *
3256  * The first unformatted track is the one that got the NRF error, the address is
3257  * encoded in the sense data.
3258  *
3259  * All tracks before have returned valid data and should not be touched.
3260  * All tracks after the unformatted track might be formatted or not. This is
3261  * currently not known, remember the processed data and return the remainder of
3262  * the request to the blocklayer in __dasd_cleanup_cqr().
3263  */
3264 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3265 {
3266         struct dasd_eckd_private *private;
3267         sector_t first_trk, last_trk;
3268         sector_t first_blk, last_blk;
3269         unsigned int blksize, off;
3270         unsigned int recs_per_trk;
3271         struct dasd_device *base;
3272         struct req_iterator iter;
3273         struct dasd_block *block;
3274         unsigned int skip_block;
3275         unsigned int blk_count;
3276         struct request *req;
3277         struct bio_vec bv;
3278         sector_t curr_trk;
3279         sector_t end_blk;
3280         char *dst;
3281         int rc;
3282
3283         req = (struct request *) cqr->callback_data;
3284         base = cqr->block->base;
3285         blksize = base->block->bp_block;
3286         block =  cqr->block;
3287         private = base->private;
3288         skip_block = 0;
3289         blk_count = 0;
3290
3291         recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3292         first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3293         sector_div(first_trk, recs_per_trk);
3294         last_trk = last_blk =
3295                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3296         sector_div(last_trk, recs_per_trk);
3297         rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3298         if (rc)
3299                 return rc;
3300
3301         /* sanity check if the current track from sense data is valid */
3302         if (curr_trk < first_trk || curr_trk > last_trk) {
3303                 DBF_DEV_EVENT(DBF_WARNING, base,
3304                               "ESE error track %llu not within range %llu - %llu\n",
3305                               curr_trk, first_trk, last_trk);
3306                 return -EINVAL;
3307         }
3308
3309         /*
3310          * if not the first track got the NRF error we have to skip over valid
3311          * blocks
3312          */
3313         if (curr_trk != first_trk)
3314                 skip_block = curr_trk * recs_per_trk - first_blk;
3315
3316         /* we have no information beyond the current track */
3317         end_blk = (curr_trk + 1) * recs_per_trk;
3318
3319         rq_for_each_segment(bv, req, iter) {
3320                 dst = bvec_virt(&bv);
3321                 for (off = 0; off < bv.bv_len; off += blksize) {
3322                         if (first_blk + blk_count >= end_blk) {
3323                                 cqr->proc_bytes = blk_count * blksize;
3324                                 return 0;
3325                         }
3326                         if (dst && !skip_block)
3327                                 memset(dst, 0, blksize);
3328                         else
3329                                 skip_block--;
3330                         dst += blksize;
3331                         blk_count++;
3332                 }
3333         }
3334         return 0;
3335 }
3336
3337 /*
3338  * Helper function to count consecutive records of a single track.
3339  */
3340 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3341                                    int max)
3342 {
3343         int head;
3344         int i;
3345
3346         head = fmt_buffer[start].head;
3347
3348         /*
3349          * There are 3 conditions where we stop counting:
3350          * - if data reoccurs (same head and record may reoccur), which may
3351          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
3352          * - when the head changes, because we're iterating over several tracks
3353          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
3354          * - when we've reached the end of sensible data in the buffer (the
3355          *   record will be 0 then)
3356          */
3357         for (i = start; i < max; i++) {
3358                 if (i > start) {
3359                         if ((fmt_buffer[i].head == head &&
3360                             fmt_buffer[i].record == 1) ||
3361                             fmt_buffer[i].head != head ||
3362                             fmt_buffer[i].record == 0)
3363                                 break;
3364                 }
3365         }
3366
3367         return i - start;
3368 }
3369
3370 /*
3371  * Evaluate a given range of tracks. Data like number of records, blocksize,
3372  * record ids, and key length are compared with expected data.
3373  *
3374  * If a mismatch occurs, the corresponding error bit is set, as well as
3375  * additional information, depending on the error.
3376  */
3377 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3378                                              struct format_check_t *cdata,
3379                                              int rpt_max, int rpt_exp,
3380                                              int trk_per_cyl, int tpm)
3381 {
3382         struct ch_t geo;
3383         int max_entries;
3384         int count = 0;
3385         int trkcount;
3386         int blksize;
3387         int pos = 0;
3388         int i, j;
3389         int kl;
3390
3391         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3392         max_entries = trkcount * rpt_max;
3393
3394         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3395                 /* Calculate the correct next starting position in the buffer */
3396                 if (tpm) {
3397                         while (fmt_buffer[pos].record == 0 &&
3398                                fmt_buffer[pos].dl == 0) {
3399                                 if (pos++ > max_entries)
3400                                         break;
3401                         }
3402                 } else {
3403                         if (i != cdata->expect.start_unit)
3404                                 pos += rpt_max - count;
3405                 }
3406
3407                 /* Calculate the expected geo values for the current track */
3408                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3409
3410                 /* Count and check number of records */
3411                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3412
3413                 if (count < rpt_exp) {
3414                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3415                         break;
3416                 }
3417                 if (count > rpt_exp) {
3418                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3419                         break;
3420                 }
3421
3422                 for (j = 0; j < count; j++, pos++) {
3423                         blksize = cdata->expect.blksize;
3424                         kl = 0;
3425
3426                         /*
3427                          * Set special values when checking CDL formatted
3428                          * devices.
3429                          */
3430                         if ((cdata->expect.intensity & 0x08) &&
3431                             geo.cyl == 0 && geo.head == 0) {
3432                                 if (j < 3) {
3433                                         blksize = sizes_trk0[j] - 4;
3434                                         kl = 4;
3435                                 }
3436                         }
3437                         if ((cdata->expect.intensity & 0x08) &&
3438                             geo.cyl == 0 && geo.head == 1) {
3439                                 blksize = LABEL_SIZE - 44;
3440                                 kl = 44;
3441                         }
3442
3443                         /* Check blocksize */
3444                         if (fmt_buffer[pos].dl != blksize) {
3445                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
3446                                 goto out;
3447                         }
3448                         /* Check if key length is 0 */
3449                         if (fmt_buffer[pos].kl != kl) {
3450                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3451                                 goto out;
3452                         }
3453                         /* Check if record_id is correct */
3454                         if (fmt_buffer[pos].cyl != geo.cyl ||
3455                             fmt_buffer[pos].head != geo.head ||
3456                             fmt_buffer[pos].record != (j + 1)) {
3457                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
3458                                 goto out;
3459                         }
3460                 }
3461         }
3462
3463 out:
3464         /*
3465          * In case of no errors, we need to decrease by one
3466          * to get the correct positions.
3467          */
3468         if (!cdata->result) {
3469                 i--;
3470                 pos--;
3471         }
3472
3473         cdata->unit = i;
3474         cdata->num_records = count;
3475         cdata->rec = fmt_buffer[pos].record;
3476         cdata->blksize = fmt_buffer[pos].dl;
3477         cdata->key_length = fmt_buffer[pos].kl;
3478 }
3479
3480 /*
3481  * Check the format of a range of tracks of a DASD.
3482  */
3483 static int dasd_eckd_check_device_format(struct dasd_device *base,
3484                                          struct format_check_t *cdata,
3485                                          int enable_pav)
3486 {
3487         struct dasd_eckd_private *private = base->private;
3488         struct eckd_count *fmt_buffer;
3489         struct irb irb;
3490         int rpt_max, rpt_exp;
3491         int fmt_buffer_size;
3492         int trk_per_cyl;
3493         int trkcount;
3494         int tpm = 0;
3495         int rc;
3496
3497         trk_per_cyl = private->rdc_data.trk_per_cyl;
3498
3499         /* Get maximum and expected amount of records per track */
3500         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3501         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3502
3503         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3504         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3505
3506         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3507         if (!fmt_buffer)
3508                 return -ENOMEM;
3509
3510         /*
3511          * A certain FICON feature subset is needed to operate in transport
3512          * mode. Additionally, the support for transport mode is implicitly
3513          * checked by comparing the buffer size with fcx_max_data. As long as
3514          * the buffer size is smaller we can operate in transport mode and
3515          * process multiple tracks. If not, only one track at once is being
3516          * processed using command mode.
3517          */
3518         if ((private->features.feature[40] & 0x04) &&
3519             fmt_buffer_size <= private->fcx_max_data)
3520                 tpm = 1;
3521
3522         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3523                                            tpm, fmt_buffer, rpt_max, &irb);
3524         if (rc && rc != -EIO)
3525                 goto out;
3526         if (rc == -EIO) {
3527                 /*
3528                  * If our first attempt with transport mode enabled comes back
3529                  * with an incorrect length error, we're going to retry the
3530                  * check with command mode.
3531                  */
3532                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3533                         tpm = 0;
3534                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
3535                                                            enable_pav, tpm,
3536                                                            fmt_buffer, rpt_max,
3537                                                            &irb);
3538                         if (rc)
3539                                 goto out;
3540                 } else {
3541                         goto out;
3542                 }
3543         }
3544
3545         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3546                                          trk_per_cyl, tpm);
3547
3548 out:
3549         kfree(fmt_buffer);
3550
3551         return rc;
3552 }
3553
3554 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3555 {
3556         if (cqr->retries < 0) {
3557                 cqr->status = DASD_CQR_FAILED;
3558                 return;
3559         }
3560         cqr->status = DASD_CQR_FILLED;
3561         if (cqr->block && (cqr->startdev != cqr->block->base)) {
3562                 dasd_eckd_reset_ccw_to_base_io(cqr);
3563                 cqr->startdev = cqr->block->base;
3564                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3565         }
3566 };
3567
3568 static dasd_erp_fn_t
3569 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3570 {
3571         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3572         struct ccw_device *cdev = device->cdev;
3573
3574         switch (cdev->id.cu_type) {
3575         case 0x3990:
3576         case 0x2105:
3577         case 0x2107:
3578         case 0x1750:
3579                 return dasd_3990_erp_action;
3580         case 0x9343:
3581         case 0x3880:
3582         default:
3583                 return dasd_default_erp_action;
3584         }
3585 }
3586
3587 static dasd_erp_fn_t
3588 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3589 {
3590         return dasd_default_erp_postaction;
3591 }
3592
3593 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3594                                               struct dasd_ccw_req *cqr,
3595                                               struct irb *irb)
3596 {
3597         char mask;
3598         char *sense = NULL;
3599         struct dasd_eckd_private *private = device->private;
3600
3601         /* first of all check for state change pending interrupt */
3602         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3603         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3604                 /*
3605                  * for alias only, not in offline processing
3606                  * and only if not suspended
3607                  */
3608                 if (!device->block && private->lcu &&
3609                     device->state == DASD_STATE_ONLINE &&
3610                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3611                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3612                         /* schedule worker to reload device */
3613                         dasd_reload_device(device);
3614                 }
3615                 dasd_generic_handle_state_change(device);
3616                 return;
3617         }
3618
3619         sense = dasd_get_sense(irb);
3620         if (!sense)
3621                 return;
3622
3623         /* summary unit check */
3624         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3625             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3626                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3627                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3628                                       "eckd suc: device already notified");
3629                         return;
3630                 }
3631                 sense = dasd_get_sense(irb);
3632                 if (!sense) {
3633                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3634                                       "eckd suc: no reason code available");
3635                         clear_bit(DASD_FLAG_SUC, &device->flags);
3636                         return;
3637
3638                 }
3639                 private->suc_reason = sense[8];
3640                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3641                               "eckd handle summary unit check: reason",
3642                               private->suc_reason);
3643                 dasd_get_device(device);
3644                 if (!schedule_work(&device->suc_work))
3645                         dasd_put_device(device);
3646
3647                 return;
3648         }
3649
3650         /* service information message SIM */
3651         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3652             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3653                 dasd_3990_erp_handle_sim(device, sense);
3654                 return;
3655         }
3656
3657         /* loss of device reservation is handled via base devices only
3658          * as alias devices may be used with several bases
3659          */
3660         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3661             (sense[7] == 0x3F) &&
3662             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3663             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3664                 if (device->features & DASD_FEATURE_FAILONSLCK)
3665                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3666                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3667                 dev_err(&device->cdev->dev,
3668                         "The device reservation was lost\n");
3669         }
3670 }
3671
3672 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3673                                        unsigned int first_trk,
3674                                        unsigned int last_trk)
3675 {
3676         struct dasd_eckd_private *private = device->private;
3677         unsigned int trks_per_vol;
3678         int rc = 0;
3679
3680         trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3681
3682         if (first_trk >= trks_per_vol) {
3683                 dev_warn(&device->cdev->dev,
3684                          "Start track number %u used in the space release command is too big\n",
3685                          first_trk);
3686                 rc = -EINVAL;
3687         } else if (last_trk >= trks_per_vol) {
3688                 dev_warn(&device->cdev->dev,
3689                          "Stop track number %u used in the space release command is too big\n",
3690                          last_trk);
3691                 rc = -EINVAL;
3692         } else if (first_trk > last_trk) {
3693                 dev_warn(&device->cdev->dev,
3694                          "Start track %u used in the space release command exceeds the end track\n",
3695                          first_trk);
3696                 rc = -EINVAL;
3697         }
3698         return rc;
3699 }
3700
3701 /*
3702  * Helper function to count the amount of involved extents within a given range
3703  * with extent alignment in mind.
3704  */
3705 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3706 {
3707         int cur_pos = 0;
3708         int count = 0;
3709         int tmp;
3710
3711         if (from == to)
3712                 return 1;
3713
3714         /* Count first partial extent */
3715         if (from % trks_per_ext != 0) {
3716                 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3717                 if (tmp > to)
3718                         tmp = to;
3719                 cur_pos = tmp - from + 1;
3720                 count++;
3721         }
3722         /* Count full extents */
3723         if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3724                 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3725                 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3726                 cur_pos = tmp;
3727         }
3728         /* Count last partial extent */
3729         if (cur_pos < to)
3730                 count++;
3731
3732         return count;
3733 }
3734
3735 /*
3736  * Release allocated space for a given range or an entire volume.
3737  */
3738 static struct dasd_ccw_req *
3739 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3740                   struct request *req, unsigned int first_trk,
3741                   unsigned int last_trk, int by_extent)
3742 {
3743         struct dasd_eckd_private *private = device->private;
3744         struct dasd_dso_ras_ext_range *ras_range;
3745         struct dasd_rssd_features *features;
3746         struct dasd_dso_ras_data *ras_data;
3747         u16 heads, beg_head, end_head;
3748         int cur_to_trk, cur_from_trk;
3749         struct dasd_ccw_req *cqr;
3750         u32 beg_cyl, end_cyl;
3751         struct ccw1 *ccw;
3752         int trks_per_ext;
3753         size_t ras_size;
3754         size_t size;
3755         int nr_exts;
3756         void *rq;
3757         int i;
3758
3759         if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3760                 return ERR_PTR(-EINVAL);
3761
3762         rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3763
3764         features = &private->features;
3765
3766         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3767         nr_exts = 0;
3768         if (by_extent)
3769                 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3770         ras_size = sizeof(*ras_data);
3771         size = ras_size + (nr_exts * sizeof(*ras_range));
3772
3773         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3774         if (IS_ERR(cqr)) {
3775                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3776                                 "Could not allocate RAS request");
3777                 return cqr;
3778         }
3779
3780         ras_data = cqr->data;
3781         memset(ras_data, 0, size);
3782
3783         ras_data->order = DSO_ORDER_RAS;
3784         ras_data->flags.vol_type = 0; /* CKD volume */
3785         /* Release specified extents or entire volume */
3786         ras_data->op_flags.by_extent = by_extent;
3787         /*
3788          * This bit guarantees initialisation of tracks within an extent that is
3789          * not fully specified, but is only supported with a certain feature
3790          * subset.
3791          */
3792         ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3793         ras_data->lss = private->conf.ned->ID;
3794         ras_data->dev_addr = private->conf.ned->unit_addr;
3795         ras_data->nr_exts = nr_exts;
3796
3797         if (by_extent) {
3798                 heads = private->rdc_data.trk_per_cyl;
3799                 cur_from_trk = first_trk;
3800                 cur_to_trk = first_trk + trks_per_ext -
3801                         (first_trk % trks_per_ext) - 1;
3802                 if (cur_to_trk > last_trk)
3803                         cur_to_trk = last_trk;
3804                 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3805
3806                 for (i = 0; i < nr_exts; i++) {
3807                         beg_cyl = cur_from_trk / heads;
3808                         beg_head = cur_from_trk % heads;
3809                         end_cyl = cur_to_trk / heads;
3810                         end_head = cur_to_trk % heads;
3811
3812                         set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3813                         set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3814
3815                         cur_from_trk = cur_to_trk + 1;
3816                         cur_to_trk = cur_from_trk + trks_per_ext - 1;
3817                         if (cur_to_trk > last_trk)
3818                                 cur_to_trk = last_trk;
3819                         ras_range++;
3820                 }
3821         }
3822
3823         ccw = cqr->cpaddr;
3824         ccw->cda = (__u32)virt_to_phys(cqr->data);
3825         ccw->cmd_code = DASD_ECKD_CCW_DSO;
3826         ccw->count = size;
3827
3828         cqr->startdev = device;
3829         cqr->memdev = device;
3830         cqr->block = block;
3831         cqr->retries = 256;
3832         cqr->expires = device->default_expires * HZ;
3833         cqr->buildclk = get_tod_clock();
3834         cqr->status = DASD_CQR_FILLED;
3835
3836         return cqr;
3837 }
3838
3839 static int dasd_eckd_release_space_full(struct dasd_device *device)
3840 {
3841         struct dasd_ccw_req *cqr;
3842         int rc;
3843
3844         cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3845         if (IS_ERR(cqr))
3846                 return PTR_ERR(cqr);
3847
3848         rc = dasd_sleep_on_interruptible(cqr);
3849
3850         dasd_sfree_request(cqr, cqr->memdev);
3851
3852         return rc;
3853 }
3854
3855 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3856                                         unsigned int from, unsigned int to)
3857 {
3858         struct dasd_eckd_private *private = device->private;
3859         struct dasd_block *block = device->block;
3860         struct dasd_ccw_req *cqr, *n;
3861         struct list_head ras_queue;
3862         unsigned int device_exts;
3863         int trks_per_ext;
3864         int stop, step;
3865         int cur_pos;
3866         int rc = 0;
3867         int retry;
3868
3869         INIT_LIST_HEAD(&ras_queue);
3870
3871         device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3872         trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3873
3874         /* Make sure device limits are not exceeded */
3875         step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3876         cur_pos = from;
3877
3878         do {
3879                 retry = 0;
3880                 while (cur_pos < to) {
3881                         stop = cur_pos + step -
3882                                 ((cur_pos + step) % trks_per_ext) - 1;
3883                         if (stop > to)
3884                                 stop = to;
3885
3886                         cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3887                         if (IS_ERR(cqr)) {
3888                                 rc = PTR_ERR(cqr);
3889                                 if (rc == -ENOMEM) {
3890                                         if (list_empty(&ras_queue))
3891                                                 goto out;
3892                                         retry = 1;
3893                                         break;
3894                                 }
3895                                 goto err_out;
3896                         }
3897
3898                         spin_lock_irq(&block->queue_lock);
3899                         list_add_tail(&cqr->blocklist, &ras_queue);
3900                         spin_unlock_irq(&block->queue_lock);
3901                         cur_pos = stop + 1;
3902                 }
3903
3904                 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3905
3906 err_out:
3907                 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3908                         device = cqr->startdev;
3909                         private = device->private;
3910
3911                         spin_lock_irq(&block->queue_lock);
3912                         list_del_init(&cqr->blocklist);
3913                         spin_unlock_irq(&block->queue_lock);
3914                         dasd_sfree_request(cqr, device);
3915                         private->count--;
3916                 }
3917         } while (retry);
3918
3919 out:
3920         return rc;
3921 }
3922
3923 static int dasd_eckd_release_space(struct dasd_device *device,
3924                                    struct format_data_t *rdata)
3925 {
3926         if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3927                 return dasd_eckd_release_space_full(device);
3928         else if (rdata->intensity == 0)
3929                 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3930                                                     rdata->stop_unit);
3931         else
3932                 return -EINVAL;
3933 }
3934
3935 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3936                                                struct dasd_device *startdev,
3937                                                struct dasd_block *block,
3938                                                struct request *req,
3939                                                sector_t first_rec,
3940                                                sector_t last_rec,
3941                                                sector_t first_trk,
3942                                                sector_t last_trk,
3943                                                unsigned int first_offs,
3944                                                unsigned int last_offs,
3945                                                unsigned int blk_per_trk,
3946                                                unsigned int blksize)
3947 {
3948         struct dasd_eckd_private *private;
3949         unsigned long *idaws;
3950         struct LO_eckd_data *LO_data;
3951         struct dasd_ccw_req *cqr;
3952         struct ccw1 *ccw;
3953         struct req_iterator iter;
3954         struct bio_vec bv;
3955         char *dst;
3956         unsigned int off;
3957         int count, cidaw, cplength, datasize;
3958         sector_t recid;
3959         unsigned char cmd, rcmd;
3960         int use_prefix;
3961         struct dasd_device *basedev;
3962
3963         basedev = block->base;
3964         private = basedev->private;
3965         if (rq_data_dir(req) == READ)
3966                 cmd = DASD_ECKD_CCW_READ_MT;
3967         else if (rq_data_dir(req) == WRITE)
3968                 cmd = DASD_ECKD_CCW_WRITE_MT;
3969         else
3970                 return ERR_PTR(-EINVAL);
3971
3972         /* Check struct bio and count the number of blocks for the request. */
3973         count = 0;
3974         cidaw = 0;
3975         rq_for_each_segment(bv, req, iter) {
3976                 if (bv.bv_len & (blksize - 1))
3977                         /* Eckd can only do full blocks. */
3978                         return ERR_PTR(-EINVAL);
3979                 count += bv.bv_len >> (block->s2b_shift + 9);
3980                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3981                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3982         }
3983         /* Paranoia. */
3984         if (count != last_rec - first_rec + 1)
3985                 return ERR_PTR(-EINVAL);
3986
3987         /* use the prefix command if available */
3988         use_prefix = private->features.feature[8] & 0x01;
3989         if (use_prefix) {
3990                 /* 1x prefix + number of blocks */
3991                 cplength = 2 + count;
3992                 /* 1x prefix + cidaws*sizeof(long) */
3993                 datasize = sizeof(struct PFX_eckd_data) +
3994                         sizeof(struct LO_eckd_data) +
3995                         cidaw * sizeof(unsigned long);
3996         } else {
3997                 /* 1x define extent + 1x locate record + number of blocks */
3998                 cplength = 2 + count;
3999                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
4000                 datasize = sizeof(struct DE_eckd_data) +
4001                         sizeof(struct LO_eckd_data) +
4002                         cidaw * sizeof(unsigned long);
4003         }
4004         /* Find out the number of additional locate record ccws for cdl. */
4005         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
4006                 if (last_rec >= 2*blk_per_trk)
4007                         count = 2*blk_per_trk - first_rec;
4008                 cplength += count;
4009                 datasize += count*sizeof(struct LO_eckd_data);
4010         }
4011         /* Allocate the ccw request. */
4012         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4013                                    startdev, blk_mq_rq_to_pdu(req));
4014         if (IS_ERR(cqr))
4015                 return cqr;
4016         ccw = cqr->cpaddr;
4017         /* First ccw is define extent or prefix. */
4018         if (use_prefix) {
4019                 if (prefix(ccw++, cqr->data, first_trk,
4020                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
4021                         /* Clock not in sync and XRC is enabled.
4022                          * Try again later.
4023                          */
4024                         dasd_sfree_request(cqr, startdev);
4025                         return ERR_PTR(-EAGAIN);
4026                 }
4027                 idaws = (unsigned long *) (cqr->data +
4028                                            sizeof(struct PFX_eckd_data));
4029         } else {
4030                 if (define_extent(ccw++, cqr->data, first_trk,
4031                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
4032                         /* Clock not in sync and XRC is enabled.
4033                          * Try again later.
4034                          */
4035                         dasd_sfree_request(cqr, startdev);
4036                         return ERR_PTR(-EAGAIN);
4037                 }
4038                 idaws = (unsigned long *) (cqr->data +
4039                                            sizeof(struct DE_eckd_data));
4040         }
4041         /* Build locate_record+read/write/ccws. */
4042         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
4043         recid = first_rec;
4044         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
4045                 /* Only standard blocks so there is just one locate record. */
4046                 ccw[-1].flags |= CCW_FLAG_CC;
4047                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
4048                               last_rec - recid + 1, cmd, basedev, blksize);
4049         }
4050         rq_for_each_segment(bv, req, iter) {
4051                 dst = bvec_virt(&bv);
4052                 if (dasd_page_cache) {
4053                         char *copy = kmem_cache_alloc(dasd_page_cache,
4054                                                       GFP_DMA | __GFP_NOWARN);
4055                         if (copy && rq_data_dir(req) == WRITE)
4056                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
4057                         if (copy)
4058                                 dst = copy + bv.bv_offset;
4059                 }
4060                 for (off = 0; off < bv.bv_len; off += blksize) {
4061                         sector_t trkid = recid;
4062                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
4063                         rcmd = cmd;
4064                         count = blksize;
4065                         /* Locate record for cdl special block ? */
4066                         if (private->uses_cdl && recid < 2*blk_per_trk) {
4067                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
4068                                         rcmd |= 0x8;
4069                                         count = dasd_eckd_cdl_reclen(recid);
4070                                         if (count < blksize &&
4071                                             rq_data_dir(req) == READ)
4072                                                 memset(dst + count, 0xe5,
4073                                                        blksize - count);
4074                                 }
4075                                 ccw[-1].flags |= CCW_FLAG_CC;
4076                                 locate_record(ccw++, LO_data++,
4077                                               trkid, recoffs + 1,
4078                                               1, rcmd, basedev, count);
4079                         }
4080                         /* Locate record for standard blocks ? */
4081                         if (private->uses_cdl && recid == 2*blk_per_trk) {
4082                                 ccw[-1].flags |= CCW_FLAG_CC;
4083                                 locate_record(ccw++, LO_data++,
4084                                               trkid, recoffs + 1,
4085                                               last_rec - recid + 1,
4086                                               cmd, basedev, count);
4087                         }
4088                         /* Read/write ccw. */
4089                         ccw[-1].flags |= CCW_FLAG_CC;
4090                         ccw->cmd_code = rcmd;
4091                         ccw->count = count;
4092                         if (idal_is_needed(dst, blksize)) {
4093                                 ccw->cda = (__u32)virt_to_phys(idaws);
4094                                 ccw->flags = CCW_FLAG_IDA;
4095                                 idaws = idal_create_words(idaws, dst, blksize);
4096                         } else {
4097                                 ccw->cda = (__u32)virt_to_phys(dst);
4098                                 ccw->flags = 0;
4099                         }
4100                         ccw++;
4101                         dst += blksize;
4102                         recid++;
4103                 }
4104         }
4105         if (blk_noretry_request(req) ||
4106             block->base->features & DASD_FEATURE_FAILFAST)
4107                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4108         cqr->startdev = startdev;
4109         cqr->memdev = startdev;
4110         cqr->block = block;
4111         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4112         cqr->lpm = dasd_path_get_ppm(startdev);
4113         cqr->retries = startdev->default_retries;
4114         cqr->buildclk = get_tod_clock();
4115         cqr->status = DASD_CQR_FILLED;
4116
4117         /* Set flags to suppress output for expected errors */
4118         if (dasd_eckd_is_ese(basedev)) {
4119                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4120                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4121                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4122         }
4123
4124         return cqr;
4125 }
4126
4127 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4128                                                struct dasd_device *startdev,
4129                                                struct dasd_block *block,
4130                                                struct request *req,
4131                                                sector_t first_rec,
4132                                                sector_t last_rec,
4133                                                sector_t first_trk,
4134                                                sector_t last_trk,
4135                                                unsigned int first_offs,
4136                                                unsigned int last_offs,
4137                                                unsigned int blk_per_trk,
4138                                                unsigned int blksize)
4139 {
4140         unsigned long *idaws;
4141         struct dasd_ccw_req *cqr;
4142         struct ccw1 *ccw;
4143         struct req_iterator iter;
4144         struct bio_vec bv;
4145         char *dst, *idaw_dst;
4146         unsigned int cidaw, cplength, datasize;
4147         unsigned int tlf;
4148         sector_t recid;
4149         unsigned char cmd;
4150         struct dasd_device *basedev;
4151         unsigned int trkcount, count, count_to_trk_end;
4152         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4153         unsigned char new_track, end_idaw;
4154         sector_t trkid;
4155         unsigned int recoffs;
4156
4157         basedev = block->base;
4158         if (rq_data_dir(req) == READ)
4159                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4160         else if (rq_data_dir(req) == WRITE)
4161                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4162         else
4163                 return ERR_PTR(-EINVAL);
4164
4165         /* Track based I/O needs IDAWs for each page, and not just for
4166          * 64 bit addresses. We need additional idals for pages
4167          * that get filled from two tracks, so we use the number
4168          * of records as upper limit.
4169          */
4170         cidaw = last_rec - first_rec + 1;
4171         trkcount = last_trk - first_trk + 1;
4172
4173         /* 1x prefix + one read/write ccw per track */
4174         cplength = 1 + trkcount;
4175
4176         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4177
4178         /* Allocate the ccw request. */
4179         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4180                                    startdev, blk_mq_rq_to_pdu(req));
4181         if (IS_ERR(cqr))
4182                 return cqr;
4183         ccw = cqr->cpaddr;
4184         /* transfer length factor: how many bytes to read from the last track */
4185         if (first_trk == last_trk)
4186                 tlf = last_offs - first_offs + 1;
4187         else
4188                 tlf = last_offs + 1;
4189         tlf *= blksize;
4190
4191         if (prefix_LRE(ccw++, cqr->data, first_trk,
4192                        last_trk, cmd, basedev, startdev,
4193                        1 /* format */, first_offs + 1,
4194                        trkcount, blksize,
4195                        tlf) == -EAGAIN) {
4196                 /* Clock not in sync and XRC is enabled.
4197                  * Try again later.
4198                  */
4199                 dasd_sfree_request(cqr, startdev);
4200                 return ERR_PTR(-EAGAIN);
4201         }
4202
4203         /*
4204          * The translation of request into ccw programs must meet the
4205          * following conditions:
4206          * - all idaws but the first and the last must address full pages
4207          *   (or 2K blocks on 31-bit)
4208          * - the scope of a ccw and it's idal ends with the track boundaries
4209          */
4210         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4211         recid = first_rec;
4212         new_track = 1;
4213         end_idaw = 0;
4214         len_to_track_end = 0;
4215         idaw_dst = NULL;
4216         idaw_len = 0;
4217         rq_for_each_segment(bv, req, iter) {
4218                 dst = bvec_virt(&bv);
4219                 seg_len = bv.bv_len;
4220                 while (seg_len) {
4221                         if (new_track) {
4222                                 trkid = recid;
4223                                 recoffs = sector_div(trkid, blk_per_trk);
4224                                 count_to_trk_end = blk_per_trk - recoffs;
4225                                 count = min((last_rec - recid + 1),
4226                                             (sector_t)count_to_trk_end);
4227                                 len_to_track_end = count * blksize;
4228                                 ccw[-1].flags |= CCW_FLAG_CC;
4229                                 ccw->cmd_code = cmd;
4230                                 ccw->count = len_to_track_end;
4231                                 ccw->cda = (__u32)virt_to_phys(idaws);
4232                                 ccw->flags = CCW_FLAG_IDA;
4233                                 ccw++;
4234                                 recid += count;
4235                                 new_track = 0;
4236                                 /* first idaw for a ccw may start anywhere */
4237                                 if (!idaw_dst)
4238                                         idaw_dst = dst;
4239                         }
4240                         /* If we start a new idaw, we must make sure that it
4241                          * starts on an IDA_BLOCK_SIZE boundary.
4242                          * If we continue an idaw, we must make sure that the
4243                          * current segment begins where the so far accumulated
4244                          * idaw ends
4245                          */
4246                         if (!idaw_dst) {
4247                                 if ((__u32)virt_to_phys(dst) & (IDA_BLOCK_SIZE - 1)) {
4248                                         dasd_sfree_request(cqr, startdev);
4249                                         return ERR_PTR(-ERANGE);
4250                                 } else
4251                                         idaw_dst = dst;
4252                         }
4253                         if ((idaw_dst + idaw_len) != dst) {
4254                                 dasd_sfree_request(cqr, startdev);
4255                                 return ERR_PTR(-ERANGE);
4256                         }
4257                         part_len = min(seg_len, len_to_track_end);
4258                         seg_len -= part_len;
4259                         dst += part_len;
4260                         idaw_len += part_len;
4261                         len_to_track_end -= part_len;
4262                         /* collected memory area ends on an IDA_BLOCK border,
4263                          * -> create an idaw
4264                          * idal_create_words will handle cases where idaw_len
4265                          * is larger then IDA_BLOCK_SIZE
4266                          */
4267                         if (!((__u32)virt_to_phys(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE - 1)))
4268                                 end_idaw = 1;
4269                         /* We also need to end the idaw at track end */
4270                         if (!len_to_track_end) {
4271                                 new_track = 1;
4272                                 end_idaw = 1;
4273                         }
4274                         if (end_idaw) {
4275                                 idaws = idal_create_words(idaws, idaw_dst,
4276                                                           idaw_len);
4277                                 idaw_dst = NULL;
4278                                 idaw_len = 0;
4279                                 end_idaw = 0;
4280                         }
4281                 }
4282         }
4283
4284         if (blk_noretry_request(req) ||
4285             block->base->features & DASD_FEATURE_FAILFAST)
4286                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4287         cqr->startdev = startdev;
4288         cqr->memdev = startdev;
4289         cqr->block = block;
4290         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4291         cqr->lpm = dasd_path_get_ppm(startdev);
4292         cqr->retries = startdev->default_retries;
4293         cqr->buildclk = get_tod_clock();
4294         cqr->status = DASD_CQR_FILLED;
4295
4296         /* Set flags to suppress output for expected errors */
4297         if (dasd_eckd_is_ese(basedev))
4298                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4299
4300         return cqr;
4301 }
4302
4303 static int prepare_itcw(struct itcw *itcw,
4304                         unsigned int trk, unsigned int totrk, int cmd,
4305                         struct dasd_device *basedev,
4306                         struct dasd_device *startdev,
4307                         unsigned int rec_on_trk, int count,
4308                         unsigned int blksize,
4309                         unsigned int total_data_size,
4310                         unsigned int tlf,
4311                         unsigned int blk_per_trk)
4312 {
4313         struct PFX_eckd_data pfxdata;
4314         struct dasd_eckd_private *basepriv, *startpriv;
4315         struct DE_eckd_data *dedata;
4316         struct LRE_eckd_data *lredata;
4317         struct dcw *dcw;
4318
4319         u32 begcyl, endcyl;
4320         u16 heads, beghead, endhead;
4321         u8 pfx_cmd;
4322
4323         int rc = 0;
4324         int sector = 0;
4325         int dn, d;
4326
4327
4328         /* setup prefix data */
4329         basepriv = basedev->private;
4330         startpriv = startdev->private;
4331         dedata = &pfxdata.define_extent;
4332         lredata = &pfxdata.locate_record;
4333
4334         memset(&pfxdata, 0, sizeof(pfxdata));
4335         pfxdata.format = 1; /* PFX with LRE */
4336         pfxdata.base_address = basepriv->conf.ned->unit_addr;
4337         pfxdata.base_lss = basepriv->conf.ned->ID;
4338         pfxdata.validity.define_extent = 1;
4339
4340         /* private uid is kept up to date, conf_data may be outdated */
4341         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4342                 pfxdata.validity.verify_base = 1;
4343
4344         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4345                 pfxdata.validity.verify_base = 1;
4346                 pfxdata.validity.hyper_pav = 1;
4347         }
4348
4349         switch (cmd) {
4350         case DASD_ECKD_CCW_READ_TRACK_DATA:
4351                 dedata->mask.perm = 0x1;
4352                 dedata->attributes.operation = basepriv->attrib.operation;
4353                 dedata->blk_size = blksize;
4354                 dedata->ga_extended |= 0x42;
4355                 lredata->operation.orientation = 0x0;
4356                 lredata->operation.operation = 0x0C;
4357                 lredata->auxiliary.check_bytes = 0x01;
4358                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4359                 break;
4360         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4361                 dedata->mask.perm = 0x02;
4362                 dedata->attributes.operation = basepriv->attrib.operation;
4363                 dedata->blk_size = blksize;
4364                 rc = set_timestamp(NULL, dedata, basedev);
4365                 dedata->ga_extended |= 0x42;
4366                 lredata->operation.orientation = 0x0;
4367                 lredata->operation.operation = 0x3F;
4368                 lredata->extended_operation = 0x23;
4369                 lredata->auxiliary.check_bytes = 0x2;
4370                 /*
4371                  * If XRC is supported the System Time Stamp is set. The
4372                  * validity of the time stamp must be reflected in the prefix
4373                  * data as well.
4374                  */
4375                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4376                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4377                 pfx_cmd = DASD_ECKD_CCW_PFX;
4378                 break;
4379         case DASD_ECKD_CCW_READ_COUNT_MT:
4380                 dedata->mask.perm = 0x1;
4381                 dedata->attributes.operation = DASD_BYPASS_CACHE;
4382                 dedata->ga_extended |= 0x42;
4383                 dedata->blk_size = blksize;
4384                 lredata->operation.orientation = 0x2;
4385                 lredata->operation.operation = 0x16;
4386                 lredata->auxiliary.check_bytes = 0x01;
4387                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4388                 break;
4389         default:
4390                 DBF_DEV_EVENT(DBF_ERR, basedev,
4391                               "prepare itcw, unknown opcode 0x%x", cmd);
4392                 BUG();
4393                 break;
4394         }
4395         if (rc)
4396                 return rc;
4397
4398         dedata->attributes.mode = 0x3;  /* ECKD */
4399
4400         heads = basepriv->rdc_data.trk_per_cyl;
4401         begcyl = trk / heads;
4402         beghead = trk % heads;
4403         endcyl = totrk / heads;
4404         endhead = totrk % heads;
4405
4406         /* check for sequential prestage - enhance cylinder range */
4407         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4408             dedata->attributes.operation == DASD_SEQ_ACCESS) {
4409
4410                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4411                         endcyl += basepriv->attrib.nr_cyl;
4412                 else
4413                         endcyl = (basepriv->real_cyl - 1);
4414         }
4415
4416         set_ch_t(&dedata->beg_ext, begcyl, beghead);
4417         set_ch_t(&dedata->end_ext, endcyl, endhead);
4418
4419         dedata->ep_format = 0x20; /* records per track is valid */
4420         dedata->ep_rec_per_track = blk_per_trk;
4421
4422         if (rec_on_trk) {
4423                 switch (basepriv->rdc_data.dev_type) {
4424                 case 0x3390:
4425                         dn = ceil_quot(blksize + 6, 232);
4426                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4427                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4428                         break;
4429                 case 0x3380:
4430                         d = 7 + ceil_quot(blksize + 12, 32);
4431                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4432                         break;
4433                 }
4434         }
4435
4436         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4437                 lredata->auxiliary.length_valid = 0;
4438                 lredata->auxiliary.length_scope = 0;
4439                 lredata->sector = 0xff;
4440         } else {
4441                 lredata->auxiliary.length_valid = 1;
4442                 lredata->auxiliary.length_scope = 1;
4443                 lredata->sector = sector;
4444         }
4445         lredata->auxiliary.imbedded_ccw_valid = 1;
4446         lredata->length = tlf;
4447         lredata->imbedded_ccw = cmd;
4448         lredata->count = count;
4449         set_ch_t(&lredata->seek_addr, begcyl, beghead);
4450         lredata->search_arg.cyl = lredata->seek_addr.cyl;
4451         lredata->search_arg.head = lredata->seek_addr.head;
4452         lredata->search_arg.record = rec_on_trk;
4453
4454         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4455                      &pfxdata, sizeof(pfxdata), total_data_size);
4456         return PTR_ERR_OR_ZERO(dcw);
4457 }
4458
4459 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4460                                                struct dasd_device *startdev,
4461                                                struct dasd_block *block,
4462                                                struct request *req,
4463                                                sector_t first_rec,
4464                                                sector_t last_rec,
4465                                                sector_t first_trk,
4466                                                sector_t last_trk,
4467                                                unsigned int first_offs,
4468                                                unsigned int last_offs,
4469                                                unsigned int blk_per_trk,
4470                                                unsigned int blksize)
4471 {
4472         struct dasd_ccw_req *cqr;
4473         struct req_iterator iter;
4474         struct bio_vec bv;
4475         char *dst;
4476         unsigned int trkcount, ctidaw;
4477         unsigned char cmd;
4478         struct dasd_device *basedev;
4479         unsigned int tlf;
4480         struct itcw *itcw;
4481         struct tidaw *last_tidaw = NULL;
4482         int itcw_op;
4483         size_t itcw_size;
4484         u8 tidaw_flags;
4485         unsigned int seg_len, part_len, len_to_track_end;
4486         unsigned char new_track;
4487         sector_t recid, trkid;
4488         unsigned int offs;
4489         unsigned int count, count_to_trk_end;
4490         int ret;
4491
4492         basedev = block->base;
4493         if (rq_data_dir(req) == READ) {
4494                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4495                 itcw_op = ITCW_OP_READ;
4496         } else if (rq_data_dir(req) == WRITE) {
4497                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4498                 itcw_op = ITCW_OP_WRITE;
4499         } else
4500                 return ERR_PTR(-EINVAL);
4501
4502         /* trackbased I/O needs address all memory via TIDAWs,
4503          * not just for 64 bit addresses. This allows us to map
4504          * each segment directly to one tidaw.
4505          * In the case of write requests, additional tidaws may
4506          * be needed when a segment crosses a track boundary.
4507          */
4508         trkcount = last_trk - first_trk + 1;
4509         ctidaw = 0;
4510         rq_for_each_segment(bv, req, iter) {
4511                 ++ctidaw;
4512         }
4513         if (rq_data_dir(req) == WRITE)
4514                 ctidaw += (last_trk - first_trk);
4515
4516         /* Allocate the ccw request. */
4517         itcw_size = itcw_calc_size(0, ctidaw, 0);
4518         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4519                                    blk_mq_rq_to_pdu(req));
4520         if (IS_ERR(cqr))
4521                 return cqr;
4522
4523         /* transfer length factor: how many bytes to read from the last track */
4524         if (first_trk == last_trk)
4525                 tlf = last_offs - first_offs + 1;
4526         else
4527                 tlf = last_offs + 1;
4528         tlf *= blksize;
4529
4530         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4531         if (IS_ERR(itcw)) {
4532                 ret = -EINVAL;
4533                 goto out_error;
4534         }
4535         cqr->cpaddr = itcw_get_tcw(itcw);
4536         if (prepare_itcw(itcw, first_trk, last_trk,
4537                          cmd, basedev, startdev,
4538                          first_offs + 1,
4539                          trkcount, blksize,
4540                          (last_rec - first_rec + 1) * blksize,
4541                          tlf, blk_per_trk) == -EAGAIN) {
4542                 /* Clock not in sync and XRC is enabled.
4543                  * Try again later.
4544                  */
4545                 ret = -EAGAIN;
4546                 goto out_error;
4547         }
4548         len_to_track_end = 0;
4549         /*
4550          * A tidaw can address 4k of memory, but must not cross page boundaries
4551          * We can let the block layer handle this by setting
4552          * blk_queue_segment_boundary to page boundaries and
4553          * blk_max_segment_size to page size when setting up the request queue.
4554          * For write requests, a TIDAW must not cross track boundaries, because
4555          * we have to set the CBC flag on the last tidaw for each track.
4556          */
4557         if (rq_data_dir(req) == WRITE) {
4558                 new_track = 1;
4559                 recid = first_rec;
4560                 rq_for_each_segment(bv, req, iter) {
4561                         dst = bvec_virt(&bv);
4562                         seg_len = bv.bv_len;
4563                         while (seg_len) {
4564                                 if (new_track) {
4565                                         trkid = recid;
4566                                         offs = sector_div(trkid, blk_per_trk);
4567                                         count_to_trk_end = blk_per_trk - offs;
4568                                         count = min((last_rec - recid + 1),
4569                                                     (sector_t)count_to_trk_end);
4570                                         len_to_track_end = count * blksize;
4571                                         recid += count;
4572                                         new_track = 0;
4573                                 }
4574                                 part_len = min(seg_len, len_to_track_end);
4575                                 seg_len -= part_len;
4576                                 len_to_track_end -= part_len;
4577                                 /* We need to end the tidaw at track end */
4578                                 if (!len_to_track_end) {
4579                                         new_track = 1;
4580                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4581                                 } else
4582                                         tidaw_flags = 0;
4583                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4584                                                             dst, part_len);
4585                                 if (IS_ERR(last_tidaw)) {
4586                                         ret = -EINVAL;
4587                                         goto out_error;
4588                                 }
4589                                 dst += part_len;
4590                         }
4591                 }
4592         } else {
4593                 rq_for_each_segment(bv, req, iter) {
4594                         dst = bvec_virt(&bv);
4595                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
4596                                                     dst, bv.bv_len);
4597                         if (IS_ERR(last_tidaw)) {
4598                                 ret = -EINVAL;
4599                                 goto out_error;
4600                         }
4601                 }
4602         }
4603         last_tidaw->flags |= TIDAW_FLAGS_LAST;
4604         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4605         itcw_finalize(itcw);
4606
4607         if (blk_noretry_request(req) ||
4608             block->base->features & DASD_FEATURE_FAILFAST)
4609                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4610         cqr->cpmode = 1;
4611         cqr->startdev = startdev;
4612         cqr->memdev = startdev;
4613         cqr->block = block;
4614         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
4615         cqr->lpm = dasd_path_get_ppm(startdev);
4616         cqr->retries = startdev->default_retries;
4617         cqr->buildclk = get_tod_clock();
4618         cqr->status = DASD_CQR_FILLED;
4619
4620         /* Set flags to suppress output for expected errors */
4621         if (dasd_eckd_is_ese(basedev)) {
4622                 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4623                 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4624                 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4625         }
4626
4627         return cqr;
4628 out_error:
4629         dasd_sfree_request(cqr, startdev);
4630         return ERR_PTR(ret);
4631 }
4632
4633 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4634                                                struct dasd_block *block,
4635                                                struct request *req)
4636 {
4637         int cmdrtd, cmdwtd;
4638         int use_prefix;
4639         int fcx_multitrack;
4640         struct dasd_eckd_private *private;
4641         struct dasd_device *basedev;
4642         sector_t first_rec, last_rec;
4643         sector_t first_trk, last_trk;
4644         unsigned int first_offs, last_offs;
4645         unsigned int blk_per_trk, blksize;
4646         int cdlspecial;
4647         unsigned int data_size;
4648         struct dasd_ccw_req *cqr;
4649
4650         basedev = block->base;
4651         private = basedev->private;
4652
4653         /* Calculate number of blocks/records per track. */
4654         blksize = block->bp_block;
4655         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4656         if (blk_per_trk == 0)
4657                 return ERR_PTR(-EINVAL);
4658         /* Calculate record id of first and last block. */
4659         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4660         first_offs = sector_div(first_trk, blk_per_trk);
4661         last_rec = last_trk =
4662                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4663         last_offs = sector_div(last_trk, blk_per_trk);
4664         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4665
4666         fcx_multitrack = private->features.feature[40] & 0x20;
4667         data_size = blk_rq_bytes(req);
4668         if (data_size % blksize)
4669                 return ERR_PTR(-EINVAL);
4670         /* tpm write request add CBC data on each track boundary */
4671         if (rq_data_dir(req) == WRITE)
4672                 data_size += (last_trk - first_trk) * 4;
4673
4674         /* is read track data and write track data in command mode supported? */
4675         cmdrtd = private->features.feature[9] & 0x20;
4676         cmdwtd = private->features.feature[12] & 0x40;
4677         use_prefix = private->features.feature[8] & 0x01;
4678
4679         cqr = NULL;
4680         if (cdlspecial || dasd_page_cache) {
4681                 /* do nothing, just fall through to the cmd mode single case */
4682         } else if ((data_size <= private->fcx_max_data)
4683                    && (fcx_multitrack || (first_trk == last_trk))) {
4684                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4685                                                     first_rec, last_rec,
4686                                                     first_trk, last_trk,
4687                                                     first_offs, last_offs,
4688                                                     blk_per_trk, blksize);
4689                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4690                     (PTR_ERR(cqr) != -ENOMEM))
4691                         cqr = NULL;
4692         } else if (use_prefix &&
4693                    (((rq_data_dir(req) == READ) && cmdrtd) ||
4694                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4695                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4696                                                    first_rec, last_rec,
4697                                                    first_trk, last_trk,
4698                                                    first_offs, last_offs,
4699                                                    blk_per_trk, blksize);
4700                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4701                     (PTR_ERR(cqr) != -ENOMEM))
4702                         cqr = NULL;
4703         }
4704         if (!cqr)
4705                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4706                                                     first_rec, last_rec,
4707                                                     first_trk, last_trk,
4708                                                     first_offs, last_offs,
4709                                                     blk_per_trk, blksize);
4710         return cqr;
4711 }
4712
4713 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4714                                                    struct dasd_block *block,
4715                                                    struct request *req)
4716 {
4717         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4718         unsigned int seg_len, len_to_track_end;
4719         unsigned int cidaw, cplength, datasize;
4720         sector_t first_trk, last_trk, sectors;
4721         struct dasd_eckd_private *base_priv;
4722         struct dasd_device *basedev;
4723         struct req_iterator iter;
4724         struct dasd_ccw_req *cqr;
4725         unsigned int trkcount;
4726         unsigned long *idaws;
4727         unsigned int size;
4728         unsigned char cmd;
4729         struct bio_vec bv;
4730         struct ccw1 *ccw;
4731         int use_prefix;
4732         void *data;
4733         char *dst;
4734
4735         /*
4736          * raw track access needs to be mutiple of 64k and on 64k boundary
4737          * For read requests we can fix an incorrect alignment by padding
4738          * the request with dummy pages.
4739          */
4740         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4741         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4742                 DASD_RAW_SECTORS_PER_TRACK;
4743         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4744                 DASD_RAW_SECTORS_PER_TRACK;
4745         basedev = block->base;
4746         if ((start_padding_sectors || end_padding_sectors) &&
4747             (rq_data_dir(req) == WRITE)) {
4748                 DBF_DEV_EVENT(DBF_ERR, basedev,
4749                               "raw write not track aligned (%llu,%llu) req %p",
4750                               start_padding_sectors, end_padding_sectors, req);
4751                 return ERR_PTR(-EINVAL);
4752         }
4753
4754         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4755         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4756                 DASD_RAW_SECTORS_PER_TRACK;
4757         trkcount = last_trk - first_trk + 1;
4758
4759         if (rq_data_dir(req) == READ)
4760                 cmd = DASD_ECKD_CCW_READ_TRACK;
4761         else if (rq_data_dir(req) == WRITE)
4762                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4763         else
4764                 return ERR_PTR(-EINVAL);
4765
4766         /*
4767          * Raw track based I/O needs IDAWs for each page,
4768          * and not just for 64 bit addresses.
4769          */
4770         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4771
4772         /*
4773          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4774          * of extended parameter. This is needed for write full track.
4775          */
4776         base_priv = basedev->private;
4777         use_prefix = base_priv->features.feature[8] & 0x01;
4778         if (use_prefix) {
4779                 cplength = 1 + trkcount;
4780                 size = sizeof(struct PFX_eckd_data) + 2;
4781         } else {
4782                 cplength = 2 + trkcount;
4783                 size = sizeof(struct DE_eckd_data) +
4784                         sizeof(struct LRE_eckd_data) + 2;
4785         }
4786         size = ALIGN(size, 8);
4787
4788         datasize = size + cidaw * sizeof(unsigned long);
4789
4790         /* Allocate the ccw request. */
4791         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4792                                    datasize, startdev, blk_mq_rq_to_pdu(req));
4793         if (IS_ERR(cqr))
4794                 return cqr;
4795
4796         ccw = cqr->cpaddr;
4797         data = cqr->data;
4798
4799         if (use_prefix) {
4800                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4801                            startdev, 1, 0, trkcount, 0, 0);
4802         } else {
4803                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4804                 ccw[-1].flags |= CCW_FLAG_CC;
4805
4806                 data += sizeof(struct DE_eckd_data);
4807                 locate_record_ext(ccw++, data, first_trk, 0,
4808                                   trkcount, cmd, basedev, 0, 0);
4809         }
4810
4811         idaws = (unsigned long *)(cqr->data + size);
4812         len_to_track_end = 0;
4813         if (start_padding_sectors) {
4814                 ccw[-1].flags |= CCW_FLAG_CC;
4815                 ccw->cmd_code = cmd;
4816                 /* maximum 3390 track size */
4817                 ccw->count = 57326;
4818                 /* 64k map to one track */
4819                 len_to_track_end = 65536 - start_padding_sectors * 512;
4820                 ccw->cda = (__u32)virt_to_phys(idaws);
4821                 ccw->flags |= CCW_FLAG_IDA;
4822                 ccw->flags |= CCW_FLAG_SLI;
4823                 ccw++;
4824                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4825                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4826         }
4827         rq_for_each_segment(bv, req, iter) {
4828                 dst = bvec_virt(&bv);
4829                 seg_len = bv.bv_len;
4830                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4831                         memset(dst, 0, seg_len);
4832                 if (!len_to_track_end) {
4833                         ccw[-1].flags |= CCW_FLAG_CC;
4834                         ccw->cmd_code = cmd;
4835                         /* maximum 3390 track size */
4836                         ccw->count = 57326;
4837                         /* 64k map to one track */
4838                         len_to_track_end = 65536;
4839                         ccw->cda = (__u32)virt_to_phys(idaws);
4840                         ccw->flags |= CCW_FLAG_IDA;
4841                         ccw->flags |= CCW_FLAG_SLI;
4842                         ccw++;
4843                 }
4844                 len_to_track_end -= seg_len;
4845                 idaws = idal_create_words(idaws, dst, seg_len);
4846         }
4847         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4848                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4849         if (blk_noretry_request(req) ||
4850             block->base->features & DASD_FEATURE_FAILFAST)
4851                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4852         cqr->startdev = startdev;
4853         cqr->memdev = startdev;
4854         cqr->block = block;
4855         cqr->expires = startdev->default_expires * HZ;
4856         cqr->lpm = dasd_path_get_ppm(startdev);
4857         cqr->retries = startdev->default_retries;
4858         cqr->buildclk = get_tod_clock();
4859         cqr->status = DASD_CQR_FILLED;
4860
4861         return cqr;
4862 }
4863
4864
4865 static int
4866 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4867 {
4868         struct dasd_eckd_private *private;
4869         struct ccw1 *ccw;
4870         struct req_iterator iter;
4871         struct bio_vec bv;
4872         char *dst, *cda;
4873         unsigned int blksize, blk_per_trk, off;
4874         sector_t recid;
4875         int status;
4876
4877         if (!dasd_page_cache)
4878                 goto out;
4879         private = cqr->block->base->private;
4880         blksize = cqr->block->bp_block;
4881         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4882         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4883         ccw = cqr->cpaddr;
4884         /* Skip over define extent & locate record. */
4885         ccw++;
4886         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4887                 ccw++;
4888         rq_for_each_segment(bv, req, iter) {
4889                 dst = bvec_virt(&bv);
4890                 for (off = 0; off < bv.bv_len; off += blksize) {
4891                         /* Skip locate record. */
4892                         if (private->uses_cdl && recid <= 2*blk_per_trk)
4893                                 ccw++;
4894                         if (dst) {
4895                                 if (ccw->flags & CCW_FLAG_IDA)
4896                                         cda = *((char **)phys_to_virt(ccw->cda));
4897                                 else
4898                                         cda = phys_to_virt(ccw->cda);
4899                                 if (dst != cda) {
4900                                         if (rq_data_dir(req) == READ)
4901                                                 memcpy(dst, cda, bv.bv_len);
4902                                         kmem_cache_free(dasd_page_cache,
4903                                             (void *)((addr_t)cda & PAGE_MASK));
4904                                 }
4905                                 dst = NULL;
4906                         }
4907                         ccw++;
4908                         recid++;
4909                 }
4910         }
4911 out:
4912         status = cqr->status == DASD_CQR_DONE;
4913         dasd_sfree_request(cqr, cqr->memdev);
4914         return status;
4915 }
4916
4917 /*
4918  * Modify ccw/tcw in cqr so it can be started on a base device.
4919  *
4920  * Note that this is not enough to restart the cqr!
4921  * Either reset cqr->startdev as well (summary unit check handling)
4922  * or restart via separate cqr (as in ERP handling).
4923  */
4924 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4925 {
4926         struct ccw1 *ccw;
4927         struct PFX_eckd_data *pfxdata;
4928         struct tcw *tcw;
4929         struct tccb *tccb;
4930         struct dcw *dcw;
4931
4932         if (cqr->cpmode == 1) {
4933                 tcw = cqr->cpaddr;
4934                 tccb = tcw_get_tccb(tcw);
4935                 dcw = (struct dcw *)&tccb->tca[0];
4936                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4937                 pfxdata->validity.verify_base = 0;
4938                 pfxdata->validity.hyper_pav = 0;
4939         } else {
4940                 ccw = cqr->cpaddr;
4941                 pfxdata = cqr->data;
4942                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4943                         pfxdata->validity.verify_base = 0;
4944                         pfxdata->validity.hyper_pav = 0;
4945                 }
4946         }
4947 }
4948
4949 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4950
4951 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4952                                                      struct dasd_block *block,
4953                                                      struct request *req)
4954 {
4955         struct dasd_eckd_private *private;
4956         struct dasd_device *startdev;
4957         unsigned long flags;
4958         struct dasd_ccw_req *cqr;
4959
4960         startdev = dasd_alias_get_start_dev(base);
4961         if (!startdev)
4962                 startdev = base;
4963         private = startdev->private;
4964         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4965                 return ERR_PTR(-EBUSY);
4966
4967         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4968         private->count++;
4969         if ((base->features & DASD_FEATURE_USERAW))
4970                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4971         else
4972                 cqr = dasd_eckd_build_cp(startdev, block, req);
4973         if (IS_ERR(cqr))
4974                 private->count--;
4975         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4976         return cqr;
4977 }
4978
4979 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4980                                    struct request *req)
4981 {
4982         struct dasd_eckd_private *private;
4983         unsigned long flags;
4984
4985         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4986         private = cqr->memdev->private;
4987         private->count--;
4988         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4989         return dasd_eckd_free_cp(cqr, req);
4990 }
4991
4992 static int
4993 dasd_eckd_fill_info(struct dasd_device * device,
4994                     struct dasd_information2_t * info)
4995 {
4996         struct dasd_eckd_private *private = device->private;
4997
4998         info->label_block = 2;
4999         info->FBA_layout = private->uses_cdl ? 0 : 1;
5000         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
5001         info->characteristics_size = sizeof(private->rdc_data);
5002         memcpy(info->characteristics, &private->rdc_data,
5003                sizeof(private->rdc_data));
5004         info->confdata_size = min_t(unsigned long, private->conf.len,
5005                                     sizeof(info->configuration_data));
5006         memcpy(info->configuration_data, private->conf.data,
5007                info->confdata_size);
5008         return 0;
5009 }
5010
5011 /*
5012  * SECTION: ioctl functions for eckd devices.
5013  */
5014
5015 /*
5016  * Release device ioctl.
5017  * Buils a channel programm to releases a prior reserved
5018  * (see dasd_eckd_reserve) device.
5019  */
5020 static int
5021 dasd_eckd_release(struct dasd_device *device)
5022 {
5023         struct dasd_ccw_req *cqr;
5024         int rc;
5025         struct ccw1 *ccw;
5026         int useglobal;
5027
5028         if (!capable(CAP_SYS_ADMIN))
5029                 return -EACCES;
5030
5031         useglobal = 0;
5032         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5033         if (IS_ERR(cqr)) {
5034                 mutex_lock(&dasd_reserve_mutex);
5035                 useglobal = 1;
5036                 cqr = &dasd_reserve_req->cqr;
5037                 memset(cqr, 0, sizeof(*cqr));
5038                 memset(&dasd_reserve_req->ccw, 0,
5039                        sizeof(dasd_reserve_req->ccw));
5040                 cqr->cpaddr = &dasd_reserve_req->ccw;
5041                 cqr->data = &dasd_reserve_req->data;
5042                 cqr->magic = DASD_ECKD_MAGIC;
5043         }
5044         ccw = cqr->cpaddr;
5045         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
5046         ccw->flags |= CCW_FLAG_SLI;
5047         ccw->count = 32;
5048         ccw->cda = (__u32)virt_to_phys(cqr->data);
5049         cqr->startdev = device;
5050         cqr->memdev = device;
5051         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5052         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5053         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5054         cqr->expires = 2 * HZ;
5055         cqr->buildclk = get_tod_clock();
5056         cqr->status = DASD_CQR_FILLED;
5057
5058         rc = dasd_sleep_on_immediatly(cqr);
5059         if (!rc)
5060                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5061
5062         if (useglobal)
5063                 mutex_unlock(&dasd_reserve_mutex);
5064         else
5065                 dasd_sfree_request(cqr, cqr->memdev);
5066         return rc;
5067 }
5068
5069 /*
5070  * Reserve device ioctl.
5071  * Options are set to 'synchronous wait for interrupt' and
5072  * 'timeout the request'. This leads to a terminate IO if
5073  * the interrupt is outstanding for a certain time.
5074  */
5075 static int
5076 dasd_eckd_reserve(struct dasd_device *device)
5077 {
5078         struct dasd_ccw_req *cqr;
5079         int rc;
5080         struct ccw1 *ccw;
5081         int useglobal;
5082
5083         if (!capable(CAP_SYS_ADMIN))
5084                 return -EACCES;
5085
5086         useglobal = 0;
5087         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5088         if (IS_ERR(cqr)) {
5089                 mutex_lock(&dasd_reserve_mutex);
5090                 useglobal = 1;
5091                 cqr = &dasd_reserve_req->cqr;
5092                 memset(cqr, 0, sizeof(*cqr));
5093                 memset(&dasd_reserve_req->ccw, 0,
5094                        sizeof(dasd_reserve_req->ccw));
5095                 cqr->cpaddr = &dasd_reserve_req->ccw;
5096                 cqr->data = &dasd_reserve_req->data;
5097                 cqr->magic = DASD_ECKD_MAGIC;
5098         }
5099         ccw = cqr->cpaddr;
5100         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5101         ccw->flags |= CCW_FLAG_SLI;
5102         ccw->count = 32;
5103         ccw->cda = (__u32)virt_to_phys(cqr->data);
5104         cqr->startdev = device;
5105         cqr->memdev = device;
5106         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5107         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5108         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5109         cqr->expires = 2 * HZ;
5110         cqr->buildclk = get_tod_clock();
5111         cqr->status = DASD_CQR_FILLED;
5112
5113         rc = dasd_sleep_on_immediatly(cqr);
5114         if (!rc)
5115                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5116
5117         if (useglobal)
5118                 mutex_unlock(&dasd_reserve_mutex);
5119         else
5120                 dasd_sfree_request(cqr, cqr->memdev);
5121         return rc;
5122 }
5123
5124 /*
5125  * Steal lock ioctl - unconditional reserve device.
5126  * Buils a channel programm to break a device's reservation.
5127  * (unconditional reserve)
5128  */
5129 static int
5130 dasd_eckd_steal_lock(struct dasd_device *device)
5131 {
5132         struct dasd_ccw_req *cqr;
5133         int rc;
5134         struct ccw1 *ccw;
5135         int useglobal;
5136
5137         if (!capable(CAP_SYS_ADMIN))
5138                 return -EACCES;
5139
5140         useglobal = 0;
5141         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5142         if (IS_ERR(cqr)) {
5143                 mutex_lock(&dasd_reserve_mutex);
5144                 useglobal = 1;
5145                 cqr = &dasd_reserve_req->cqr;
5146                 memset(cqr, 0, sizeof(*cqr));
5147                 memset(&dasd_reserve_req->ccw, 0,
5148                        sizeof(dasd_reserve_req->ccw));
5149                 cqr->cpaddr = &dasd_reserve_req->ccw;
5150                 cqr->data = &dasd_reserve_req->data;
5151                 cqr->magic = DASD_ECKD_MAGIC;
5152         }
5153         ccw = cqr->cpaddr;
5154         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5155         ccw->flags |= CCW_FLAG_SLI;
5156         ccw->count = 32;
5157         ccw->cda = (__u32)virt_to_phys(cqr->data);
5158         cqr->startdev = device;
5159         cqr->memdev = device;
5160         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5161         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5162         cqr->retries = 2;       /* set retry counter to enable basic ERP */
5163         cqr->expires = 2 * HZ;
5164         cqr->buildclk = get_tod_clock();
5165         cqr->status = DASD_CQR_FILLED;
5166
5167         rc = dasd_sleep_on_immediatly(cqr);
5168         if (!rc)
5169                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5170
5171         if (useglobal)
5172                 mutex_unlock(&dasd_reserve_mutex);
5173         else
5174                 dasd_sfree_request(cqr, cqr->memdev);
5175         return rc;
5176 }
5177
5178 /*
5179  * SNID - Sense Path Group ID
5180  * This ioctl may be used in situations where I/O is stalled due to
5181  * a reserve, so if the normal dasd_smalloc_request fails, we use the
5182  * preallocated dasd_reserve_req.
5183  */
5184 static int dasd_eckd_snid(struct dasd_device *device,
5185                           void __user *argp)
5186 {
5187         struct dasd_ccw_req *cqr;
5188         int rc;
5189         struct ccw1 *ccw;
5190         int useglobal;
5191         struct dasd_snid_ioctl_data usrparm;
5192
5193         if (!capable(CAP_SYS_ADMIN))
5194                 return -EACCES;
5195
5196         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5197                 return -EFAULT;
5198
5199         useglobal = 0;
5200         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5201                                    sizeof(struct dasd_snid_data), device,
5202                                    NULL);
5203         if (IS_ERR(cqr)) {
5204                 mutex_lock(&dasd_reserve_mutex);
5205                 useglobal = 1;
5206                 cqr = &dasd_reserve_req->cqr;
5207                 memset(cqr, 0, sizeof(*cqr));
5208                 memset(&dasd_reserve_req->ccw, 0,
5209                        sizeof(dasd_reserve_req->ccw));
5210                 cqr->cpaddr = &dasd_reserve_req->ccw;
5211                 cqr->data = &dasd_reserve_req->data;
5212                 cqr->magic = DASD_ECKD_MAGIC;
5213         }
5214         ccw = cqr->cpaddr;
5215         ccw->cmd_code = DASD_ECKD_CCW_SNID;
5216         ccw->flags |= CCW_FLAG_SLI;
5217         ccw->count = 12;
5218         ccw->cda = (__u32)virt_to_phys(cqr->data);
5219         cqr->startdev = device;
5220         cqr->memdev = device;
5221         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5222         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5223         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5224         cqr->retries = 5;
5225         cqr->expires = 10 * HZ;
5226         cqr->buildclk = get_tod_clock();
5227         cqr->status = DASD_CQR_FILLED;
5228         cqr->lpm = usrparm.path_mask;
5229
5230         rc = dasd_sleep_on_immediatly(cqr);
5231         /* verify that I/O processing didn't modify the path mask */
5232         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5233                 rc = -EIO;
5234         if (!rc) {
5235                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5236                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5237                         rc = -EFAULT;
5238         }
5239
5240         if (useglobal)
5241                 mutex_unlock(&dasd_reserve_mutex);
5242         else
5243                 dasd_sfree_request(cqr, cqr->memdev);
5244         return rc;
5245 }
5246
5247 /*
5248  * Read performance statistics
5249  */
5250 static int
5251 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5252 {
5253         struct dasd_psf_prssd_data *prssdp;
5254         struct dasd_rssd_perf_stats_t *stats;
5255         struct dasd_ccw_req *cqr;
5256         struct ccw1 *ccw;
5257         int rc;
5258
5259         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
5260                                    (sizeof(struct dasd_psf_prssd_data) +
5261                                     sizeof(struct dasd_rssd_perf_stats_t)),
5262                                    device, NULL);
5263         if (IS_ERR(cqr)) {
5264                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5265                             "Could not allocate initialization request");
5266                 return PTR_ERR(cqr);
5267         }
5268         cqr->startdev = device;
5269         cqr->memdev = device;
5270         cqr->retries = 0;
5271         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5272         cqr->expires = 10 * HZ;
5273
5274         /* Prepare for Read Subsystem Data */
5275         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5276         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5277         prssdp->order = PSF_ORDER_PRSSD;
5278         prssdp->suborder = 0x01;        /* Performance Statistics */
5279         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
5280
5281         ccw = cqr->cpaddr;
5282         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5283         ccw->count = sizeof(struct dasd_psf_prssd_data);
5284         ccw->flags |= CCW_FLAG_CC;
5285         ccw->cda = (__u32)virt_to_phys(prssdp);
5286
5287         /* Read Subsystem Data - Performance Statistics */
5288         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5289         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5290
5291         ccw++;
5292         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5293         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5294         ccw->cda = (__u32)virt_to_phys(stats);
5295
5296         cqr->buildclk = get_tod_clock();
5297         cqr->status = DASD_CQR_FILLED;
5298         rc = dasd_sleep_on(cqr);
5299         if (rc == 0) {
5300                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5301                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5302                 if (copy_to_user(argp, stats,
5303                                  sizeof(struct dasd_rssd_perf_stats_t)))
5304                         rc = -EFAULT;
5305         }
5306         dasd_sfree_request(cqr, cqr->memdev);
5307         return rc;
5308 }
5309
5310 /*
5311  * Get attributes (cache operations)
5312  * Returnes the cache attributes used in Define Extend (DE).
5313  */
5314 static int
5315 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5316 {
5317         struct dasd_eckd_private *private = device->private;
5318         struct attrib_data_t attrib = private->attrib;
5319         int rc;
5320
5321         if (!capable(CAP_SYS_ADMIN))
5322                 return -EACCES;
5323         if (!argp)
5324                 return -EINVAL;
5325
5326         rc = 0;
5327         if (copy_to_user(argp, (long *) &attrib,
5328                          sizeof(struct attrib_data_t)))
5329                 rc = -EFAULT;
5330
5331         return rc;
5332 }
5333
5334 /*
5335  * Set attributes (cache operations)
5336  * Stores the attributes for cache operation to be used in Define Extend (DE).
5337  */
5338 static int
5339 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5340 {
5341         struct dasd_eckd_private *private = device->private;
5342         struct attrib_data_t attrib;
5343
5344         if (!capable(CAP_SYS_ADMIN))
5345                 return -EACCES;
5346         if (!argp)
5347                 return -EINVAL;
5348
5349         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5350                 return -EFAULT;
5351         private->attrib = attrib;
5352
5353         dev_info(&device->cdev->dev,
5354                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5355                  private->attrib.operation, private->attrib.nr_cyl);
5356         return 0;
5357 }
5358
5359 /*
5360  * Issue syscall I/O to EMC Symmetrix array.
5361  * CCWs are PSF and RSSD
5362  */
5363 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5364 {
5365         struct dasd_symmio_parms usrparm;
5366         char *psf_data, *rssd_result;
5367         struct dasd_ccw_req *cqr;
5368         struct ccw1 *ccw;
5369         char psf0, psf1;
5370         int rc;
5371
5372         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5373                 return -EACCES;
5374         psf0 = psf1 = 0;
5375
5376         /* Copy parms from caller */
5377         rc = -EFAULT;
5378         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5379                 goto out;
5380         if (is_compat_task()) {
5381                 /* Make sure pointers are sane even on 31 bit. */
5382                 rc = -EINVAL;
5383                 if ((usrparm.psf_data >> 32) != 0)
5384                         goto out;
5385                 if ((usrparm.rssd_result >> 32) != 0)
5386                         goto out;
5387                 usrparm.psf_data &= 0x7fffffffULL;
5388                 usrparm.rssd_result &= 0x7fffffffULL;
5389         }
5390         /* at least 2 bytes are accessed and should be allocated */
5391         if (usrparm.psf_data_len < 2) {
5392                 DBF_DEV_EVENT(DBF_WARNING, device,
5393                               "Symmetrix ioctl invalid data length %d",
5394                               usrparm.psf_data_len);
5395                 rc = -EINVAL;
5396                 goto out;
5397         }
5398         /* alloc I/O data area */
5399         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5400         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5401         if (!psf_data || !rssd_result) {
5402                 rc = -ENOMEM;
5403                 goto out_free;
5404         }
5405
5406         /* get syscall header from user space */
5407         rc = -EFAULT;
5408         if (copy_from_user(psf_data,
5409                            (void __user *)(unsigned long) usrparm.psf_data,
5410                            usrparm.psf_data_len))
5411                 goto out_free;
5412         psf0 = psf_data[0];
5413         psf1 = psf_data[1];
5414
5415         /* setup CCWs for PSF + RSSD */
5416         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5417         if (IS_ERR(cqr)) {
5418                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5419                         "Could not allocate initialization request");
5420                 rc = PTR_ERR(cqr);
5421                 goto out_free;
5422         }
5423
5424         cqr->startdev = device;
5425         cqr->memdev = device;
5426         cqr->retries = 3;
5427         cqr->expires = 10 * HZ;
5428         cqr->buildclk = get_tod_clock();
5429         cqr->status = DASD_CQR_FILLED;
5430
5431         /* Build the ccws */
5432         ccw = cqr->cpaddr;
5433
5434         /* PSF ccw */
5435         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5436         ccw->count = usrparm.psf_data_len;
5437         ccw->flags |= CCW_FLAG_CC;
5438         ccw->cda = (__u32)virt_to_phys(psf_data);
5439
5440         ccw++;
5441
5442         /* RSSD ccw  */
5443         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5444         ccw->count = usrparm.rssd_result_len;
5445         ccw->flags = CCW_FLAG_SLI ;
5446         ccw->cda = (__u32)virt_to_phys(rssd_result);
5447
5448         rc = dasd_sleep_on(cqr);
5449         if (rc)
5450                 goto out_sfree;
5451
5452         rc = -EFAULT;
5453         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5454                            rssd_result, usrparm.rssd_result_len))
5455                 goto out_sfree;
5456         rc = 0;
5457
5458 out_sfree:
5459         dasd_sfree_request(cqr, cqr->memdev);
5460 out_free:
5461         kfree(rssd_result);
5462         kfree(psf_data);
5463 out:
5464         DBF_DEV_EVENT(DBF_WARNING, device,
5465                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5466                       (int) psf0, (int) psf1, rc);
5467         return rc;
5468 }
5469
5470 static int
5471 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5472 {
5473         struct dasd_device *device = block->base;
5474
5475         switch (cmd) {
5476         case BIODASDGATTR:
5477                 return dasd_eckd_get_attrib(device, argp);
5478         case BIODASDSATTR:
5479                 return dasd_eckd_set_attrib(device, argp);
5480         case BIODASDPSRD:
5481                 return dasd_eckd_performance(device, argp);
5482         case BIODASDRLSE:
5483                 return dasd_eckd_release(device);
5484         case BIODASDRSRV:
5485                 return dasd_eckd_reserve(device);
5486         case BIODASDSLCK:
5487                 return dasd_eckd_steal_lock(device);
5488         case BIODASDSNID:
5489                 return dasd_eckd_snid(device, argp);
5490         case BIODASDSYMMIO:
5491                 return dasd_symm_io(device, argp);
5492         default:
5493                 return -ENOTTY;
5494         }
5495 }
5496
5497 /*
5498  * Dump the range of CCWs into 'page' buffer
5499  * and return number of printed chars.
5500  */
5501 static void
5502 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5503 {
5504         int len, count;
5505         char *datap;
5506
5507         len = 0;
5508         while (from <= to) {
5509                 len += sprintf(page + len, PRINTK_HEADER
5510                                " CCW %p: %08X %08X DAT:",
5511                                from, ((int *) from)[0], ((int *) from)[1]);
5512
5513                 /* get pointer to data (consider IDALs) */
5514                 if (from->flags & CCW_FLAG_IDA)
5515                         datap = (char *)*((addr_t *)phys_to_virt(from->cda));
5516                 else
5517                         datap = phys_to_virt(from->cda);
5518
5519                 /* dump data (max 128 bytes) */
5520                 for (count = 0; count < from->count && count < 128; count++) {
5521                         if (count % 32 == 0)
5522                                 len += sprintf(page + len, "\n");
5523                         if (count % 8 == 0)
5524                                 len += sprintf(page + len, " ");
5525                         if (count % 4 == 0)
5526                                 len += sprintf(page + len, " ");
5527                         len += sprintf(page + len, "%02x", datap[count]);
5528                 }
5529                 len += sprintf(page + len, "\n");
5530                 from++;
5531         }
5532         if (len > 0)
5533                 printk(KERN_ERR "%s", page);
5534 }
5535
5536 static void
5537 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5538                          char *reason)
5539 {
5540         u64 *sense;
5541         u64 *stat;
5542
5543         sense = (u64 *) dasd_get_sense(irb);
5544         stat = (u64 *) &irb->scsw;
5545         if (sense) {
5546                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5547                               "%016llx %016llx %016llx %016llx",
5548                               reason, *stat, *((u32 *) (stat + 1)),
5549                               sense[0], sense[1], sense[2], sense[3]);
5550         } else {
5551                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5552                               reason, *stat, *((u32 *) (stat + 1)),
5553                               "NO VALID SENSE");
5554         }
5555 }
5556
5557 /*
5558  * Print sense data and related channel program.
5559  * Parts are printed because printk buffer is only 1024 bytes.
5560  */
5561 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5562                                  struct dasd_ccw_req *req, struct irb *irb)
5563 {
5564         char *page;
5565         struct ccw1 *first, *last, *fail, *from, *to;
5566         int len, sl, sct;
5567
5568         page = (char *) get_zeroed_page(GFP_ATOMIC);
5569         if (page == NULL) {
5570                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5571                               "No memory to dump sense data\n");
5572                 return;
5573         }
5574         /* dump the sense data */
5575         len = sprintf(page, PRINTK_HEADER
5576                       " I/O status report for device %s:\n",
5577                       dev_name(&device->cdev->dev));
5578         len += sprintf(page + len, PRINTK_HEADER
5579                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5580                        "CS:%02X RC:%d\n",
5581                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5582                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5583                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5584                        req ? req->intrc : 0);
5585         len += sprintf(page + len, PRINTK_HEADER
5586                        " device %s: Failing CCW: %p\n",
5587                        dev_name(&device->cdev->dev),
5588                        phys_to_virt(irb->scsw.cmd.cpa));
5589         if (irb->esw.esw0.erw.cons) {
5590                 for (sl = 0; sl < 4; sl++) {
5591                         len += sprintf(page + len, PRINTK_HEADER
5592                                        " Sense(hex) %2d-%2d:",
5593                                        (8 * sl), ((8 * sl) + 7));
5594
5595                         for (sct = 0; sct < 8; sct++) {
5596                                 len += sprintf(page + len, " %02x",
5597                                                irb->ecw[8 * sl + sct]);
5598                         }
5599                         len += sprintf(page + len, "\n");
5600                 }
5601
5602                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5603                         /* 24 Byte Sense Data */
5604                         sprintf(page + len, PRINTK_HEADER
5605                                 " 24 Byte: %x MSG %x, "
5606                                 "%s MSGb to SYSOP\n",
5607                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5608                                 irb->ecw[1] & 0x10 ? "" : "no");
5609                 } else {
5610                         /* 32 Byte Sense Data */
5611                         sprintf(page + len, PRINTK_HEADER
5612                                 " 32 Byte: Format: %x "
5613                                 "Exception class %x\n",
5614                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5615                 }
5616         } else {
5617                 sprintf(page + len, PRINTK_HEADER
5618                         " SORRY - NO VALID SENSE AVAILABLE\n");
5619         }
5620         printk(KERN_ERR "%s", page);
5621
5622         if (req) {
5623                 /* req == NULL for unsolicited interrupts */
5624                 /* dump the Channel Program (max 140 Bytes per line) */
5625                 /* Count CCW and print first CCWs (maximum 7) */
5626                 first = req->cpaddr;
5627                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5628                 to = min(first + 6, last);
5629                 printk(KERN_ERR PRINTK_HEADER " Related CP in req: %p\n", req);
5630                 dasd_eckd_dump_ccw_range(first, to, page);
5631
5632                 /* print failing CCW area (maximum 4) */
5633                 /* scsw->cda is either valid or zero  */
5634                 from = ++to;
5635                 fail = phys_to_virt(irb->scsw.cmd.cpa); /* failing CCW */
5636                 if (from <  fail - 2) {
5637                         from = fail - 2;     /* there is a gap - print header */
5638                         printk(KERN_ERR PRINTK_HEADER "......\n");
5639                 }
5640                 to = min(fail + 1, last);
5641                 dasd_eckd_dump_ccw_range(from, to, page + len);
5642
5643                 /* print last CCWs (maximum 2) */
5644                 len = 0;
5645                 from = max(from, ++to);
5646                 if (from < last - 1) {
5647                         from = last - 1;     /* there is a gap - print header */
5648                         printk(KERN_ERR PRINTK_HEADER "......\n");
5649                 }
5650                 dasd_eckd_dump_ccw_range(from, last, page + len);
5651         }
5652         free_page((unsigned long) page);
5653 }
5654
5655
5656 /*
5657  * Print sense data from a tcw.
5658  */
5659 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5660                                  struct dasd_ccw_req *req, struct irb *irb)
5661 {
5662         char *page;
5663         int len, sl, sct, residual;
5664         struct tsb *tsb;
5665         u8 *sense, *rcq;
5666
5667         page = (char *) get_zeroed_page(GFP_ATOMIC);
5668         if (page == NULL) {
5669                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5670                             "No memory to dump sense data");
5671                 return;
5672         }
5673         /* dump the sense data */
5674         len = sprintf(page, PRINTK_HEADER
5675                       " I/O status report for device %s:\n",
5676                       dev_name(&device->cdev->dev));
5677         len += sprintf(page + len, PRINTK_HEADER
5678                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5679                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5680                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5681                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5682                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5683                        irb->scsw.tm.fcxs,
5684                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5685                        req ? req->intrc : 0);
5686         len += sprintf(page + len, PRINTK_HEADER
5687                        " device %s: Failing TCW: %p\n",
5688                        dev_name(&device->cdev->dev),
5689                        phys_to_virt(irb->scsw.tm.tcw));
5690
5691         tsb = NULL;
5692         sense = NULL;
5693         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5694                 tsb = tcw_get_tsb(phys_to_virt(irb->scsw.tm.tcw));
5695
5696         if (tsb) {
5697                 len += sprintf(page + len, PRINTK_HEADER
5698                                " tsb->length %d\n", tsb->length);
5699                 len += sprintf(page + len, PRINTK_HEADER
5700                                " tsb->flags %x\n", tsb->flags);
5701                 len += sprintf(page + len, PRINTK_HEADER
5702                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
5703                 len += sprintf(page + len, PRINTK_HEADER
5704                                " tsb->count %d\n", tsb->count);
5705                 residual = tsb->count - 28;
5706                 len += sprintf(page + len, PRINTK_HEADER
5707                                " residual %d\n", residual);
5708
5709                 switch (tsb->flags & 0x07) {
5710                 case 1: /* tsa_iostat */
5711                         len += sprintf(page + len, PRINTK_HEADER
5712                                " tsb->tsa.iostat.dev_time %d\n",
5713                                        tsb->tsa.iostat.dev_time);
5714                         len += sprintf(page + len, PRINTK_HEADER
5715                                " tsb->tsa.iostat.def_time %d\n",
5716                                        tsb->tsa.iostat.def_time);
5717                         len += sprintf(page + len, PRINTK_HEADER
5718                                " tsb->tsa.iostat.queue_time %d\n",
5719                                        tsb->tsa.iostat.queue_time);
5720                         len += sprintf(page + len, PRINTK_HEADER
5721                                " tsb->tsa.iostat.dev_busy_time %d\n",
5722                                        tsb->tsa.iostat.dev_busy_time);
5723                         len += sprintf(page + len, PRINTK_HEADER
5724                                " tsb->tsa.iostat.dev_act_time %d\n",
5725                                        tsb->tsa.iostat.dev_act_time);
5726                         sense = tsb->tsa.iostat.sense;
5727                         break;
5728                 case 2: /* ts_ddpc */
5729                         len += sprintf(page + len, PRINTK_HEADER
5730                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5731                         for (sl = 0; sl < 2; sl++) {
5732                                 len += sprintf(page + len, PRINTK_HEADER
5733                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
5734                                                (8 * sl), ((8 * sl) + 7));
5735                                 rcq = tsb->tsa.ddpc.rcq;
5736                                 for (sct = 0; sct < 8; sct++) {
5737                                         len += sprintf(page + len, " %02x",
5738                                                        rcq[8 * sl + sct]);
5739                                 }
5740                                 len += sprintf(page + len, "\n");
5741                         }
5742                         sense = tsb->tsa.ddpc.sense;
5743                         break;
5744                 case 3: /* tsa_intrg */
5745                         len += sprintf(page + len, PRINTK_HEADER
5746                                       " tsb->tsa.intrg.: not supported yet\n");
5747                         break;
5748                 }
5749
5750                 if (sense) {
5751                         for (sl = 0; sl < 4; sl++) {
5752                                 len += sprintf(page + len, PRINTK_HEADER
5753                                                " Sense(hex) %2d-%2d:",
5754                                                (8 * sl), ((8 * sl) + 7));
5755                                 for (sct = 0; sct < 8; sct++) {
5756                                         len += sprintf(page + len, " %02x",
5757                                                        sense[8 * sl + sct]);
5758                                 }
5759                                 len += sprintf(page + len, "\n");
5760                         }
5761
5762                         if (sense[27] & DASD_SENSE_BIT_0) {
5763                                 /* 24 Byte Sense Data */
5764                                 sprintf(page + len, PRINTK_HEADER
5765                                         " 24 Byte: %x MSG %x, "
5766                                         "%s MSGb to SYSOP\n",
5767                                         sense[7] >> 4, sense[7] & 0x0f,
5768                                         sense[1] & 0x10 ? "" : "no");
5769                         } else {
5770                                 /* 32 Byte Sense Data */
5771                                 sprintf(page + len, PRINTK_HEADER
5772                                         " 32 Byte: Format: %x "
5773                                         "Exception class %x\n",
5774                                         sense[6] & 0x0f, sense[22] >> 4);
5775                         }
5776                 } else {
5777                         sprintf(page + len, PRINTK_HEADER
5778                                 " SORRY - NO VALID SENSE AVAILABLE\n");
5779                 }
5780         } else {
5781                 sprintf(page + len, PRINTK_HEADER
5782                         " SORRY - NO TSB DATA AVAILABLE\n");
5783         }
5784         printk(KERN_ERR "%s", page);
5785         free_page((unsigned long) page);
5786 }
5787
5788 static void dasd_eckd_dump_sense(struct dasd_device *device,
5789                                  struct dasd_ccw_req *req, struct irb *irb)
5790 {
5791         u8 *sense = dasd_get_sense(irb);
5792
5793         if (scsw_is_tm(&irb->scsw)) {
5794                 /*
5795                  * In some cases the 'File Protected' or 'Incorrect Length'
5796                  * error might be expected and log messages shouldn't be written
5797                  * then. Check if the according suppress bit is set.
5798                  */
5799                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5800                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5801                         return;
5802                 if (scsw_cstat(&irb->scsw) == 0x40 &&
5803                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5804                         return;
5805
5806                 dasd_eckd_dump_sense_tcw(device, req, irb);
5807         } else {
5808                 /*
5809                  * In some cases the 'Command Reject' or 'No Record Found'
5810                  * error might be expected and log messages shouldn't be
5811                  * written then. Check if the according suppress bit is set.
5812                  */
5813                 if (sense && sense[0] & SNS0_CMD_REJECT &&
5814                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5815                         return;
5816
5817                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5818                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5819                         return;
5820
5821                 dasd_eckd_dump_sense_ccw(device, req, irb);
5822         }
5823 }
5824
5825 static int dasd_eckd_reload_device(struct dasd_device *device)
5826 {
5827         struct dasd_eckd_private *private = device->private;
5828         int rc, old_base;
5829         char print_uid[60];
5830         struct dasd_uid uid;
5831         unsigned long flags;
5832
5833         /*
5834          * remove device from alias handling to prevent new requests
5835          * from being scheduled on the wrong alias device
5836          */
5837         dasd_alias_remove_device(device);
5838
5839         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5840         old_base = private->uid.base_unit_addr;
5841         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5842
5843         /* Read Configuration Data */
5844         rc = dasd_eckd_read_conf(device);
5845         if (rc)
5846                 goto out_err;
5847
5848         dasd_eckd_read_fc_security(device);
5849
5850         rc = dasd_eckd_generate_uid(device);
5851         if (rc)
5852                 goto out_err;
5853         /*
5854          * update unit address configuration and
5855          * add device to alias management
5856          */
5857         dasd_alias_update_add_device(device);
5858
5859         dasd_eckd_get_uid(device, &uid);
5860
5861         if (old_base != uid.base_unit_addr) {
5862                 dasd_eckd_get_uid_string(&private->conf, print_uid);
5863                 dev_info(&device->cdev->dev,
5864                          "An Alias device was reassigned to a new base device "
5865                          "with UID: %s\n", print_uid);
5866         }
5867         return 0;
5868
5869 out_err:
5870         return -1;
5871 }
5872
5873 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5874                                          struct dasd_rssd_messages *messages,
5875                                          __u8 lpum)
5876 {
5877         struct dasd_rssd_messages *message_buf;
5878         struct dasd_psf_prssd_data *prssdp;
5879         struct dasd_ccw_req *cqr;
5880         struct ccw1 *ccw;
5881         int rc;
5882
5883         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5884                                    (sizeof(struct dasd_psf_prssd_data) +
5885                                     sizeof(struct dasd_rssd_messages)),
5886                                    device, NULL);
5887         if (IS_ERR(cqr)) {
5888                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5889                                 "Could not allocate read message buffer request");
5890                 return PTR_ERR(cqr);
5891         }
5892
5893         cqr->lpm = lpum;
5894 retry:
5895         cqr->startdev = device;
5896         cqr->memdev = device;
5897         cqr->block = NULL;
5898         cqr->expires = 10 * HZ;
5899         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5900         /* dasd_sleep_on_immediatly does not do complex error
5901          * recovery so clear erp flag and set retry counter to
5902          * do basic erp */
5903         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5904         cqr->retries = 256;
5905
5906         /* Prepare for Read Subsystem Data */
5907         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5908         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5909         prssdp->order = PSF_ORDER_PRSSD;
5910         prssdp->suborder = 0x03;        /* Message Buffer */
5911         /* all other bytes of prssdp must be zero */
5912
5913         ccw = cqr->cpaddr;
5914         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5915         ccw->count = sizeof(struct dasd_psf_prssd_data);
5916         ccw->flags |= CCW_FLAG_CC;
5917         ccw->flags |= CCW_FLAG_SLI;
5918         ccw->cda = (__u32)virt_to_phys(prssdp);
5919
5920         /* Read Subsystem Data - message buffer */
5921         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5922         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5923
5924         ccw++;
5925         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5926         ccw->count = sizeof(struct dasd_rssd_messages);
5927         ccw->flags |= CCW_FLAG_SLI;
5928         ccw->cda = (__u32)virt_to_phys(message_buf);
5929
5930         cqr->buildclk = get_tod_clock();
5931         cqr->status = DASD_CQR_FILLED;
5932         rc = dasd_sleep_on_immediatly(cqr);
5933         if (rc == 0) {
5934                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5935                 message_buf = (struct dasd_rssd_messages *)
5936                         (prssdp + 1);
5937                 memcpy(messages, message_buf,
5938                        sizeof(struct dasd_rssd_messages));
5939         } else if (cqr->lpm) {
5940                 /*
5941                  * on z/VM we might not be able to do I/O on the requested path
5942                  * but instead we get the required information on any path
5943                  * so retry with open path mask
5944                  */
5945                 cqr->lpm = 0;
5946                 goto retry;
5947         } else
5948                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5949                                 "Reading messages failed with rc=%d\n"
5950                                 , rc);
5951         dasd_sfree_request(cqr, cqr->memdev);
5952         return rc;
5953 }
5954
5955 static int dasd_eckd_query_host_access(struct dasd_device *device,
5956                                        struct dasd_psf_query_host_access *data)
5957 {
5958         struct dasd_eckd_private *private = device->private;
5959         struct dasd_psf_query_host_access *host_access;
5960         struct dasd_psf_prssd_data *prssdp;
5961         struct dasd_ccw_req *cqr;
5962         struct ccw1 *ccw;
5963         int rc;
5964
5965         /* not available for HYPER PAV alias devices */
5966         if (!device->block && private->lcu->pav == HYPER_PAV)
5967                 return -EOPNOTSUPP;
5968
5969         /* may not be supported by the storage server */
5970         if (!(private->features.feature[14] & 0x80))
5971                 return -EOPNOTSUPP;
5972
5973         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5974                                    sizeof(struct dasd_psf_prssd_data) + 1,
5975                                    device, NULL);
5976         if (IS_ERR(cqr)) {
5977                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5978                                 "Could not allocate read message buffer request");
5979                 return PTR_ERR(cqr);
5980         }
5981         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5982         if (!host_access) {
5983                 dasd_sfree_request(cqr, device);
5984                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5985                                 "Could not allocate host_access buffer");
5986                 return -ENOMEM;
5987         }
5988         cqr->startdev = device;
5989         cqr->memdev = device;
5990         cqr->block = NULL;
5991         cqr->retries = 256;
5992         cqr->expires = 10 * HZ;
5993
5994         /* Prepare for Read Subsystem Data */
5995         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5996         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5997         prssdp->order = PSF_ORDER_PRSSD;
5998         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5999         /* LSS and Volume that will be queried */
6000         prssdp->lss = private->conf.ned->ID;
6001         prssdp->volume = private->conf.ned->unit_addr;
6002         /* all other bytes of prssdp must be zero */
6003
6004         ccw = cqr->cpaddr;
6005         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6006         ccw->count = sizeof(struct dasd_psf_prssd_data);
6007         ccw->flags |= CCW_FLAG_CC;
6008         ccw->flags |= CCW_FLAG_SLI;
6009         ccw->cda = (__u32)virt_to_phys(prssdp);
6010
6011         /* Read Subsystem Data - query host access */
6012         ccw++;
6013         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6014         ccw->count = sizeof(struct dasd_psf_query_host_access);
6015         ccw->flags |= CCW_FLAG_SLI;
6016         ccw->cda = (__u32)virt_to_phys(host_access);
6017
6018         cqr->buildclk = get_tod_clock();
6019         cqr->status = DASD_CQR_FILLED;
6020         /* the command might not be supported, suppress error message */
6021         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
6022         rc = dasd_sleep_on_interruptible(cqr);
6023         if (rc == 0) {
6024                 *data = *host_access;
6025         } else {
6026                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6027                                 "Reading host access data failed with rc=%d\n",
6028                                 rc);
6029                 rc = -EOPNOTSUPP;
6030         }
6031
6032         dasd_sfree_request(cqr, cqr->memdev);
6033         kfree(host_access);
6034         return rc;
6035 }
6036 /*
6037  * return number of grouped devices
6038  */
6039 static int dasd_eckd_host_access_count(struct dasd_device *device)
6040 {
6041         struct dasd_psf_query_host_access *access;
6042         struct dasd_ckd_path_group_entry *entry;
6043         struct dasd_ckd_host_information *info;
6044         int count = 0;
6045         int rc, i;
6046
6047         access = kzalloc(sizeof(*access), GFP_NOIO);
6048         if (!access) {
6049                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6050                                 "Could not allocate access buffer");
6051                 return -ENOMEM;
6052         }
6053         rc = dasd_eckd_query_host_access(device, access);
6054         if (rc) {
6055                 kfree(access);
6056                 return rc;
6057         }
6058
6059         info = (struct dasd_ckd_host_information *)
6060                 access->host_access_information;
6061         for (i = 0; i < info->entry_count; i++) {
6062                 entry = (struct dasd_ckd_path_group_entry *)
6063                         (info->entry + i * info->entry_size);
6064                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6065                         count++;
6066         }
6067
6068         kfree(access);
6069         return count;
6070 }
6071
6072 /*
6073  * write host access information to a sequential file
6074  */
6075 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6076 {
6077         struct dasd_psf_query_host_access *access;
6078         struct dasd_ckd_path_group_entry *entry;
6079         struct dasd_ckd_host_information *info;
6080         char sysplex[9] = "";
6081         int rc, i;
6082
6083         access = kzalloc(sizeof(*access), GFP_NOIO);
6084         if (!access) {
6085                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6086                                 "Could not allocate access buffer");
6087                 return -ENOMEM;
6088         }
6089         rc = dasd_eckd_query_host_access(device, access);
6090         if (rc) {
6091                 kfree(access);
6092                 return rc;
6093         }
6094
6095         info = (struct dasd_ckd_host_information *)
6096                 access->host_access_information;
6097         for (i = 0; i < info->entry_count; i++) {
6098                 entry = (struct dasd_ckd_path_group_entry *)
6099                         (info->entry + i * info->entry_size);
6100                 /* PGID */
6101                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6102                 /* FLAGS */
6103                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6104                 /* SYSPLEX NAME */
6105                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6106                 EBCASC(sysplex, sizeof(sysplex));
6107                 seq_printf(m, "sysplex_name %8s\n", sysplex);
6108                 /* SUPPORTED CYLINDER */
6109                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6110                 /* TIMESTAMP */
6111                 seq_printf(m, "timestamp %lu\n", (unsigned long)
6112                            entry->timestamp);
6113         }
6114         kfree(access);
6115
6116         return 0;
6117 }
6118
6119 static struct dasd_device
6120 *copy_relation_find_device(struct dasd_copy_relation *copy,
6121                            char *busid)
6122 {
6123         int i;
6124
6125         for (i = 0; i < DASD_CP_ENTRIES; i++) {
6126                 if (copy->entry[i].configured &&
6127                     strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0)
6128                         return copy->entry[i].device;
6129         }
6130         return NULL;
6131 }
6132
6133 /*
6134  * set the new active/primary device
6135  */
6136 static void copy_pair_set_active(struct dasd_copy_relation *copy, char *new_busid,
6137                                  char *old_busid)
6138 {
6139         int i;
6140
6141         for (i = 0; i < DASD_CP_ENTRIES; i++) {
6142                 if (copy->entry[i].configured &&
6143                     strncmp(copy->entry[i].busid, new_busid,
6144                             DASD_BUS_ID_SIZE) == 0) {
6145                         copy->active = &copy->entry[i];
6146                         copy->entry[i].primary = true;
6147                 } else if (copy->entry[i].configured &&
6148                            strncmp(copy->entry[i].busid, old_busid,
6149                                    DASD_BUS_ID_SIZE) == 0) {
6150                         copy->entry[i].primary = false;
6151                 }
6152         }
6153 }
6154
6155 /*
6156  * The function will swap the role of a given copy pair.
6157  * During the swap operation the relation of the blockdevice is disconnected
6158  * from the old primary and connected to the new.
6159  *
6160  * IO is paused on the block queue before swap and may be resumed afterwards.
6161  */
6162 static int dasd_eckd_copy_pair_swap(struct dasd_device *device, char *prim_busid,
6163                                     char *sec_busid)
6164 {
6165         struct dasd_device *primary, *secondary;
6166         struct dasd_copy_relation *copy;
6167         struct dasd_block *block;
6168         struct gendisk *gdp;
6169
6170         copy = device->copy;
6171         if (!copy)
6172                 return DASD_COPYPAIRSWAP_INVALID;
6173         primary = copy->active->device;
6174         if (!primary)
6175                 return DASD_COPYPAIRSWAP_INVALID;
6176         /* double check if swap has correct primary */
6177         if (strncmp(dev_name(&primary->cdev->dev), prim_busid, DASD_BUS_ID_SIZE) != 0)
6178                 return DASD_COPYPAIRSWAP_PRIMARY;
6179
6180         secondary = copy_relation_find_device(copy, sec_busid);
6181         if (!secondary)
6182                 return DASD_COPYPAIRSWAP_SECONDARY;
6183
6184         /*
6185          * usually the device should be quiesced for swap
6186          * for paranoia stop device and requeue requests again
6187          */
6188         dasd_device_set_stop_bits(primary, DASD_STOPPED_PPRC);
6189         dasd_device_set_stop_bits(secondary, DASD_STOPPED_PPRC);
6190         dasd_generic_requeue_all_requests(primary);
6191
6192         /* swap DASD internal device <> block assignment */
6193         block = primary->block;
6194         primary->block = NULL;
6195         secondary->block = block;
6196         block->base = secondary;
6197         /* set new primary device in COPY relation */
6198         copy_pair_set_active(copy, sec_busid, prim_busid);
6199
6200         /* swap blocklayer device link */
6201         gdp = block->gdp;
6202         dasd_add_link_to_gendisk(gdp, secondary);
6203
6204         /* re-enable device */
6205         dasd_device_remove_stop_bits(primary, DASD_STOPPED_PPRC);
6206         dasd_device_remove_stop_bits(secondary, DASD_STOPPED_PPRC);
6207         dasd_schedule_device_bh(secondary);
6208
6209         return DASD_COPYPAIRSWAP_SUCCESS;
6210 }
6211
6212 /*
6213  * Perform Subsystem Function - Peer-to-Peer Remote Copy Extended Query
6214  */
6215 static int dasd_eckd_query_pprc_status(struct dasd_device *device,
6216                                        struct dasd_pprc_data_sc4 *data)
6217 {
6218         struct dasd_pprc_data_sc4 *pprc_data;
6219         struct dasd_psf_prssd_data *prssdp;
6220         struct dasd_ccw_req *cqr;
6221         struct ccw1 *ccw;
6222         int rc;
6223
6224         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
6225                                    sizeof(*prssdp) + sizeof(*pprc_data) + 1,
6226                                    device, NULL);
6227         if (IS_ERR(cqr)) {
6228                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6229                                 "Could not allocate query PPRC status request");
6230                 return PTR_ERR(cqr);
6231         }
6232         cqr->startdev = device;
6233         cqr->memdev = device;
6234         cqr->block = NULL;
6235         cqr->retries = 256;
6236         cqr->expires = 10 * HZ;
6237
6238         /* Prepare for Read Subsystem Data */
6239         prssdp = (struct dasd_psf_prssd_data *)cqr->data;
6240         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
6241         prssdp->order = PSF_ORDER_PRSSD;
6242         prssdp->suborder = PSF_SUBORDER_PPRCEQ;
6243         prssdp->varies[0] = PPRCEQ_SCOPE_4;
6244         pprc_data = (struct dasd_pprc_data_sc4 *)(prssdp + 1);
6245
6246         ccw = cqr->cpaddr;
6247         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6248         ccw->count = sizeof(struct dasd_psf_prssd_data);
6249         ccw->flags |= CCW_FLAG_CC;
6250         ccw->flags |= CCW_FLAG_SLI;
6251         ccw->cda = (__u32)(addr_t)prssdp;
6252
6253         /* Read Subsystem Data - query host access */
6254         ccw++;
6255         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6256         ccw->count = sizeof(*pprc_data);
6257         ccw->flags |= CCW_FLAG_SLI;
6258         ccw->cda = (__u32)(addr_t)pprc_data;
6259
6260         cqr->buildclk = get_tod_clock();
6261         cqr->status = DASD_CQR_FILLED;
6262
6263         rc = dasd_sleep_on_interruptible(cqr);
6264         if (rc == 0) {
6265                 *data = *pprc_data;
6266         } else {
6267                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6268                                 "PPRC Extended Query failed with rc=%d\n",
6269                                 rc);
6270                 rc = -EOPNOTSUPP;
6271         }
6272
6273         dasd_sfree_request(cqr, cqr->memdev);
6274         return rc;
6275 }
6276
6277 /*
6278  * ECKD NOP - no operation
6279  */
6280 static int dasd_eckd_nop(struct dasd_device *device)
6281 {
6282         struct dasd_ccw_req *cqr;
6283         struct ccw1 *ccw;
6284         int rc;
6285
6286         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 1, device, NULL);
6287         if (IS_ERR(cqr)) {
6288                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6289                                 "Could not allocate NOP request");
6290                 return PTR_ERR(cqr);
6291         }
6292         cqr->startdev = device;
6293         cqr->memdev = device;
6294         cqr->block = NULL;
6295         cqr->retries = 1;
6296         cqr->expires = 10 * HZ;
6297
6298         ccw = cqr->cpaddr;
6299         ccw->cmd_code = DASD_ECKD_CCW_NOP;
6300         ccw->flags |= CCW_FLAG_SLI;
6301
6302         cqr->buildclk = get_tod_clock();
6303         cqr->status = DASD_CQR_FILLED;
6304
6305         rc = dasd_sleep_on_interruptible(cqr);
6306         if (rc != 0) {
6307                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6308                                 "NOP failed with rc=%d\n", rc);
6309                 rc = -EOPNOTSUPP;
6310         }
6311         dasd_sfree_request(cqr, cqr->memdev);
6312         return rc;
6313 }
6314
6315 static int dasd_eckd_device_ping(struct dasd_device *device)
6316 {
6317         return dasd_eckd_nop(device);
6318 }
6319
6320 /*
6321  * Perform Subsystem Function - CUIR response
6322  */
6323 static int
6324 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6325                             __u32 message_id, __u8 lpum)
6326 {
6327         struct dasd_psf_cuir_response *psf_cuir;
6328         int pos = pathmask_to_pos(lpum);
6329         struct dasd_ccw_req *cqr;
6330         struct ccw1 *ccw;
6331         int rc;
6332
6333         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6334                                    sizeof(struct dasd_psf_cuir_response),
6335                                    device, NULL);
6336
6337         if (IS_ERR(cqr)) {
6338                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6339                            "Could not allocate PSF-CUIR request");
6340                 return PTR_ERR(cqr);
6341         }
6342
6343         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6344         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6345         psf_cuir->cc = response;
6346         psf_cuir->chpid = device->path[pos].chpid;
6347         psf_cuir->message_id = message_id;
6348         psf_cuir->cssid = device->path[pos].cssid;
6349         psf_cuir->ssid = device->path[pos].ssid;
6350         ccw = cqr->cpaddr;
6351         ccw->cmd_code = DASD_ECKD_CCW_PSF;
6352         ccw->cda = (__u32)virt_to_phys(psf_cuir);
6353         ccw->flags = CCW_FLAG_SLI;
6354         ccw->count = sizeof(struct dasd_psf_cuir_response);
6355
6356         cqr->startdev = device;
6357         cqr->memdev = device;
6358         cqr->block = NULL;
6359         cqr->retries = 256;
6360         cqr->expires = 10*HZ;
6361         cqr->buildclk = get_tod_clock();
6362         cqr->status = DASD_CQR_FILLED;
6363         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6364
6365         rc = dasd_sleep_on(cqr);
6366
6367         dasd_sfree_request(cqr, cqr->memdev);
6368         return rc;
6369 }
6370
6371 /*
6372  * return configuration data that is referenced by record selector
6373  * if a record selector is specified or per default return the
6374  * conf_data pointer for the path specified by lpum
6375  */
6376 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6377                                                      __u8 lpum,
6378                                                      struct dasd_cuir_message *cuir)
6379 {
6380         struct dasd_conf_data *conf_data;
6381         int path, pos;
6382
6383         if (cuir->record_selector == 0)
6384                 goto out;
6385         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6386                 conf_data = device->path[pos].conf_data;
6387                 if (conf_data->gneq.record_selector ==
6388                     cuir->record_selector)
6389                         return conf_data;
6390         }
6391 out:
6392         return device->path[pathmask_to_pos(lpum)].conf_data;
6393 }
6394
6395 /*
6396  * This function determines the scope of a reconfiguration request by
6397  * analysing the path and device selection data provided in the CUIR request.
6398  * Returns a path mask containing CUIR affected paths for the give device.
6399  *
6400  * If the CUIR request does not contain the required information return the
6401  * path mask of the path the attention message for the CUIR request was reveived
6402  * on.
6403  */
6404 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6405                                 struct dasd_cuir_message *cuir)
6406 {
6407         struct dasd_conf_data *ref_conf_data;
6408         unsigned long bitmask = 0, mask = 0;
6409         struct dasd_conf_data *conf_data;
6410         unsigned int pos, path;
6411         char *ref_gneq, *gneq;
6412         char *ref_ned, *ned;
6413         int tbcpm = 0;
6414
6415         /* if CUIR request does not specify the scope use the path
6416            the attention message was presented on */
6417         if (!cuir->ned_map ||
6418             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6419                 return lpum;
6420
6421         /* get reference conf data */
6422         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6423         /* reference ned is determined by ned_map field */
6424         pos = 8 - ffs(cuir->ned_map);
6425         ref_ned = (char *)&ref_conf_data->neds[pos];
6426         ref_gneq = (char *)&ref_conf_data->gneq;
6427         /* transfer 24 bit neq_map to mask */
6428         mask = cuir->neq_map[2];
6429         mask |= cuir->neq_map[1] << 8;
6430         mask |= cuir->neq_map[0] << 16;
6431
6432         for (path = 0; path < 8; path++) {
6433                 /* initialise data per path */
6434                 bitmask = mask;
6435                 conf_data = device->path[path].conf_data;
6436                 pos = 8 - ffs(cuir->ned_map);
6437                 ned = (char *) &conf_data->neds[pos];
6438                 /* compare reference ned and per path ned */
6439                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6440                         continue;
6441                 gneq = (char *)&conf_data->gneq;
6442                 /* compare reference gneq and per_path gneq under
6443                    24 bit mask where mask bit 0 equals byte 7 of
6444                    the gneq and mask bit 24 equals byte 31 */
6445                 while (bitmask) {
6446                         pos = ffs(bitmask) - 1;
6447                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6448                             != 0)
6449                                 break;
6450                         clear_bit(pos, &bitmask);
6451                 }
6452                 if (bitmask)
6453                         continue;
6454                 /* device and path match the reference values
6455                    add path to CUIR scope */
6456                 tbcpm |= 0x80 >> path;
6457         }
6458         return tbcpm;
6459 }
6460
6461 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6462                                        unsigned long paths, int action)
6463 {
6464         int pos;
6465
6466         while (paths) {
6467                 /* get position of bit in mask */
6468                 pos = 8 - ffs(paths);
6469                 /* get channel path descriptor from this position */
6470                 if (action == CUIR_QUIESCE)
6471                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
6472                                 device->path[pos].cssid,
6473                                 device->path[pos].chpid);
6474                 else if (action == CUIR_RESUME)
6475                         pr_info("Path %x.%02x is back online after service on the storage server",
6476                                 device->path[pos].cssid,
6477                                 device->path[pos].chpid);
6478                 clear_bit(7 - pos, &paths);
6479         }
6480 }
6481
6482 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6483                                       struct dasd_cuir_message *cuir)
6484 {
6485         unsigned long tbcpm;
6486
6487         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6488         /* nothing to do if path is not in use */
6489         if (!(dasd_path_get_opm(device) & tbcpm))
6490                 return 0;
6491         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6492                 /* no path would be left if the CUIR action is taken
6493                    return error */
6494                 return -EINVAL;
6495         }
6496         /* remove device from operational path mask */
6497         dasd_path_remove_opm(device, tbcpm);
6498         dasd_path_add_cuirpm(device, tbcpm);
6499         return tbcpm;
6500 }
6501
6502 /*
6503  * walk through all devices and build a path mask to quiesce them
6504  * return an error if the last path to a device would be removed
6505  *
6506  * if only part of the devices are quiesced and an error
6507  * occurs no onlining necessary, the storage server will
6508  * notify the already set offline devices again
6509  */
6510 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6511                                   struct dasd_cuir_message *cuir)
6512 {
6513         struct dasd_eckd_private *private = device->private;
6514         struct alias_pav_group *pavgroup, *tempgroup;
6515         struct dasd_device *dev, *n;
6516         unsigned long paths = 0;
6517         unsigned long flags;
6518         int tbcpm;
6519
6520         /* active devices */
6521         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6522                                  alias_list) {
6523                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6524                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6525                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6526                 if (tbcpm < 0)
6527                         goto out_err;
6528                 paths |= tbcpm;
6529         }
6530         /* inactive devices */
6531         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6532                                  alias_list) {
6533                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6534                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6535                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6536                 if (tbcpm < 0)
6537                         goto out_err;
6538                 paths |= tbcpm;
6539         }
6540         /* devices in PAV groups */
6541         list_for_each_entry_safe(pavgroup, tempgroup,
6542                                  &private->lcu->grouplist, group) {
6543                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6544                                          alias_list) {
6545                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6546                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6547                         spin_unlock_irqrestore(
6548                                 get_ccwdev_lock(dev->cdev), flags);
6549                         if (tbcpm < 0)
6550                                 goto out_err;
6551                         paths |= tbcpm;
6552                 }
6553                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6554                                          alias_list) {
6555                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6556                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6557                         spin_unlock_irqrestore(
6558                                 get_ccwdev_lock(dev->cdev), flags);
6559                         if (tbcpm < 0)
6560                                 goto out_err;
6561                         paths |= tbcpm;
6562                 }
6563         }
6564         /* notify user about all paths affected by CUIR action */
6565         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6566         return 0;
6567 out_err:
6568         return tbcpm;
6569 }
6570
6571 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6572                                  struct dasd_cuir_message *cuir)
6573 {
6574         struct dasd_eckd_private *private = device->private;
6575         struct alias_pav_group *pavgroup, *tempgroup;
6576         struct dasd_device *dev, *n;
6577         unsigned long paths = 0;
6578         int tbcpm;
6579
6580         /*
6581          * the path may have been added through a generic path event before
6582          * only trigger path verification if the path is not already in use
6583          */
6584         list_for_each_entry_safe(dev, n,
6585                                  &private->lcu->active_devices,
6586                                  alias_list) {
6587                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6588                 paths |= tbcpm;
6589                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6590                         dasd_path_add_tbvpm(dev, tbcpm);
6591                         dasd_schedule_device_bh(dev);
6592                 }
6593         }
6594         list_for_each_entry_safe(dev, n,
6595                                  &private->lcu->inactive_devices,
6596                                  alias_list) {
6597                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6598                 paths |= tbcpm;
6599                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6600                         dasd_path_add_tbvpm(dev, tbcpm);
6601                         dasd_schedule_device_bh(dev);
6602                 }
6603         }
6604         /* devices in PAV groups */
6605         list_for_each_entry_safe(pavgroup, tempgroup,
6606                                  &private->lcu->grouplist,
6607                                  group) {
6608                 list_for_each_entry_safe(dev, n,
6609                                          &pavgroup->baselist,
6610                                          alias_list) {
6611                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6612                         paths |= tbcpm;
6613                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6614                                 dasd_path_add_tbvpm(dev, tbcpm);
6615                                 dasd_schedule_device_bh(dev);
6616                         }
6617                 }
6618                 list_for_each_entry_safe(dev, n,
6619                                          &pavgroup->aliaslist,
6620                                          alias_list) {
6621                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6622                         paths |= tbcpm;
6623                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
6624                                 dasd_path_add_tbvpm(dev, tbcpm);
6625                                 dasd_schedule_device_bh(dev);
6626                         }
6627                 }
6628         }
6629         /* notify user about all paths affected by CUIR action */
6630         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6631         return 0;
6632 }
6633
6634 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6635                                  __u8 lpum)
6636 {
6637         struct dasd_cuir_message *cuir = messages;
6638         int response;
6639
6640         DBF_DEV_EVENT(DBF_WARNING, device,
6641                       "CUIR request: %016llx %016llx %016llx %08x",
6642                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6643                       ((u32 *)cuir)[3]);
6644
6645         if (cuir->code == CUIR_QUIESCE) {
6646                 /* quiesce */
6647                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6648                         response = PSF_CUIR_LAST_PATH;
6649                 else
6650                         response = PSF_CUIR_COMPLETED;
6651         } else if (cuir->code == CUIR_RESUME) {
6652                 /* resume */
6653                 dasd_eckd_cuir_resume(device, lpum, cuir);
6654                 response = PSF_CUIR_COMPLETED;
6655         } else
6656                 response = PSF_CUIR_NOT_SUPPORTED;
6657
6658         dasd_eckd_psf_cuir_response(device, response,
6659                                     cuir->message_id, lpum);
6660         DBF_DEV_EVENT(DBF_WARNING, device,
6661                       "CUIR response: %d on message ID %08x", response,
6662                       cuir->message_id);
6663         /* to make sure there is no attention left schedule work again */
6664         device->discipline->check_attention(device, lpum);
6665 }
6666
6667 static void dasd_eckd_oos_resume(struct dasd_device *device)
6668 {
6669         struct dasd_eckd_private *private = device->private;
6670         struct alias_pav_group *pavgroup, *tempgroup;
6671         struct dasd_device *dev, *n;
6672         unsigned long flags;
6673
6674         spin_lock_irqsave(&private->lcu->lock, flags);
6675         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6676                                  alias_list) {
6677                 if (dev->stopped & DASD_STOPPED_NOSPC)
6678                         dasd_generic_space_avail(dev);
6679         }
6680         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6681                                  alias_list) {
6682                 if (dev->stopped & DASD_STOPPED_NOSPC)
6683                         dasd_generic_space_avail(dev);
6684         }
6685         /* devices in PAV groups */
6686         list_for_each_entry_safe(pavgroup, tempgroup,
6687                                  &private->lcu->grouplist,
6688                                  group) {
6689                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6690                                          alias_list) {
6691                         if (dev->stopped & DASD_STOPPED_NOSPC)
6692                                 dasd_generic_space_avail(dev);
6693                 }
6694                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6695                                          alias_list) {
6696                         if (dev->stopped & DASD_STOPPED_NOSPC)
6697                                 dasd_generic_space_avail(dev);
6698                 }
6699         }
6700         spin_unlock_irqrestore(&private->lcu->lock, flags);
6701 }
6702
6703 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6704                                  __u8 lpum)
6705 {
6706         struct dasd_oos_message *oos = messages;
6707
6708         switch (oos->code) {
6709         case REPO_WARN:
6710         case POOL_WARN:
6711                 dev_warn(&device->cdev->dev,
6712                          "Extent pool usage has reached a critical value\n");
6713                 dasd_eckd_oos_resume(device);
6714                 break;
6715         case REPO_EXHAUST:
6716         case POOL_EXHAUST:
6717                 dev_warn(&device->cdev->dev,
6718                          "Extent pool is exhausted\n");
6719                 break;
6720         case REPO_RELIEVE:
6721         case POOL_RELIEVE:
6722                 dev_info(&device->cdev->dev,
6723                          "Extent pool physical space constraint has been relieved\n");
6724                 break;
6725         }
6726
6727         /* In any case, update related data */
6728         dasd_eckd_read_ext_pool_info(device);
6729
6730         /* to make sure there is no attention left schedule work again */
6731         device->discipline->check_attention(device, lpum);
6732 }
6733
6734 static void dasd_eckd_check_attention_work(struct work_struct *work)
6735 {
6736         struct check_attention_work_data *data;
6737         struct dasd_rssd_messages *messages;
6738         struct dasd_device *device;
6739         int rc;
6740
6741         data = container_of(work, struct check_attention_work_data, worker);
6742         device = data->device;
6743         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6744         if (!messages) {
6745                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6746                               "Could not allocate attention message buffer");
6747                 goto out;
6748         }
6749         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6750         if (rc)
6751                 goto out;
6752
6753         if (messages->length == ATTENTION_LENGTH_CUIR &&
6754             messages->format == ATTENTION_FORMAT_CUIR)
6755                 dasd_eckd_handle_cuir(device, messages, data->lpum);
6756         if (messages->length == ATTENTION_LENGTH_OOS &&
6757             messages->format == ATTENTION_FORMAT_OOS)
6758                 dasd_eckd_handle_oos(device, messages, data->lpum);
6759
6760 out:
6761         dasd_put_device(device);
6762         kfree(messages);
6763         kfree(data);
6764 }
6765
6766 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6767 {
6768         struct check_attention_work_data *data;
6769
6770         data = kzalloc(sizeof(*data), GFP_ATOMIC);
6771         if (!data)
6772                 return -ENOMEM;
6773         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6774         dasd_get_device(device);
6775         data->device = device;
6776         data->lpum = lpum;
6777         schedule_work(&data->worker);
6778         return 0;
6779 }
6780
6781 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6782 {
6783         if (~lpum & dasd_path_get_opm(device)) {
6784                 dasd_path_add_nohpfpm(device, lpum);
6785                 dasd_path_remove_opm(device, lpum);
6786                 dev_err(&device->cdev->dev,
6787                         "Channel path %02X lost HPF functionality and is disabled\n",
6788                         lpum);
6789                 return 1;
6790         }
6791         return 0;
6792 }
6793
6794 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6795 {
6796         struct dasd_eckd_private *private = device->private;
6797
6798         dev_err(&device->cdev->dev,
6799                 "High Performance FICON disabled\n");
6800         private->fcx_max_data = 0;
6801 }
6802
6803 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6804 {
6805         struct dasd_eckd_private *private = device->private;
6806
6807         return private->fcx_max_data ? 1 : 0;
6808 }
6809
6810 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6811                                        struct irb *irb)
6812 {
6813         struct dasd_eckd_private *private = device->private;
6814
6815         if (!private->fcx_max_data) {
6816                 /* sanity check for no HPF, the error makes no sense */
6817                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6818                               "Trying to disable HPF for a non HPF device");
6819                 return;
6820         }
6821         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6822                 dasd_eckd_disable_hpf_device(device);
6823         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6824                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6825                         return;
6826                 dasd_eckd_disable_hpf_device(device);
6827                 dasd_path_set_tbvpm(device,
6828                                   dasd_path_get_hpfpm(device));
6829         }
6830         /*
6831          * prevent that any new I/O ist started on the device and schedule a
6832          * requeue of existing requests
6833          */
6834         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6835         dasd_schedule_requeue(device);
6836 }
6837
6838 /*
6839  * Initialize block layer request queue.
6840  */
6841 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6842 {
6843         unsigned int logical_block_size = block->bp_block;
6844         struct request_queue *q = block->gdp->queue;
6845         struct dasd_device *device = block->base;
6846         int max;
6847
6848         if (device->features & DASD_FEATURE_USERAW) {
6849                 /*
6850                  * the max_blocks value for raw_track access is 256
6851                  * it is higher than the native ECKD value because we
6852                  * only need one ccw per track
6853                  * so the max_hw_sectors are
6854                  * 2048 x 512B = 1024kB = 16 tracks
6855                  */
6856                 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6857         } else {
6858                 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6859         }
6860         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6861         q->limits.max_dev_sectors = max;
6862         blk_queue_logical_block_size(q, logical_block_size);
6863         blk_queue_max_hw_sectors(q, max);
6864         blk_queue_max_segments(q, USHRT_MAX);
6865         /* With page sized segments each segment can be translated into one idaw/tidaw */
6866         blk_queue_max_segment_size(q, PAGE_SIZE);
6867         blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6868         blk_queue_dma_alignment(q, PAGE_SIZE - 1);
6869 }
6870
6871 static struct ccw_driver dasd_eckd_driver = {
6872         .driver = {
6873                 .name   = "dasd-eckd",
6874                 .owner  = THIS_MODULE,
6875                 .dev_groups = dasd_dev_groups,
6876         },
6877         .ids         = dasd_eckd_ids,
6878         .probe       = dasd_eckd_probe,
6879         .remove      = dasd_generic_remove,
6880         .set_offline = dasd_generic_set_offline,
6881         .set_online  = dasd_eckd_set_online,
6882         .notify      = dasd_generic_notify,
6883         .path_event  = dasd_generic_path_event,
6884         .shutdown    = dasd_generic_shutdown,
6885         .uc_handler  = dasd_generic_uc_handler,
6886         .int_class   = IRQIO_DAS,
6887 };
6888
6889 static struct dasd_discipline dasd_eckd_discipline = {
6890         .owner = THIS_MODULE,
6891         .name = "ECKD",
6892         .ebcname = "ECKD",
6893         .check_device = dasd_eckd_check_characteristics,
6894         .uncheck_device = dasd_eckd_uncheck_device,
6895         .do_analysis = dasd_eckd_do_analysis,
6896         .pe_handler = dasd_eckd_pe_handler,
6897         .basic_to_ready = dasd_eckd_basic_to_ready,
6898         .online_to_ready = dasd_eckd_online_to_ready,
6899         .basic_to_known = dasd_eckd_basic_to_known,
6900         .setup_blk_queue = dasd_eckd_setup_blk_queue,
6901         .fill_geometry = dasd_eckd_fill_geometry,
6902         .start_IO = dasd_start_IO,
6903         .term_IO = dasd_term_IO,
6904         .handle_terminated_request = dasd_eckd_handle_terminated_request,
6905         .format_device = dasd_eckd_format_device,
6906         .check_device_format = dasd_eckd_check_device_format,
6907         .erp_action = dasd_eckd_erp_action,
6908         .erp_postaction = dasd_eckd_erp_postaction,
6909         .check_for_device_change = dasd_eckd_check_for_device_change,
6910         .build_cp = dasd_eckd_build_alias_cp,
6911         .free_cp = dasd_eckd_free_alias_cp,
6912         .dump_sense = dasd_eckd_dump_sense,
6913         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6914         .fill_info = dasd_eckd_fill_info,
6915         .ioctl = dasd_eckd_ioctl,
6916         .reload = dasd_eckd_reload_device,
6917         .get_uid = dasd_eckd_get_uid,
6918         .kick_validate = dasd_eckd_kick_validate_server,
6919         .check_attention = dasd_eckd_check_attention,
6920         .host_access_count = dasd_eckd_host_access_count,
6921         .hosts_print = dasd_hosts_print,
6922         .handle_hpf_error = dasd_eckd_handle_hpf_error,
6923         .disable_hpf = dasd_eckd_disable_hpf_device,
6924         .hpf_enabled = dasd_eckd_hpf_enabled,
6925         .reset_path = dasd_eckd_reset_path,
6926         .is_ese = dasd_eckd_is_ese,
6927         .space_allocated = dasd_eckd_space_allocated,
6928         .space_configured = dasd_eckd_space_configured,
6929         .logical_capacity = dasd_eckd_logical_capacity,
6930         .release_space = dasd_eckd_release_space,
6931         .ext_pool_id = dasd_eckd_ext_pool_id,
6932         .ext_size = dasd_eckd_ext_size,
6933         .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6934         .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6935         .ext_pool_oos = dasd_eckd_ext_pool_oos,
6936         .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6937         .ese_format = dasd_eckd_ese_format,
6938         .ese_read = dasd_eckd_ese_read,
6939         .pprc_status = dasd_eckd_query_pprc_status,
6940         .pprc_enabled = dasd_eckd_pprc_enabled,
6941         .copy_pair_swap = dasd_eckd_copy_pair_swap,
6942         .device_ping = dasd_eckd_device_ping,
6943 };
6944
6945 static int __init
6946 dasd_eckd_init(void)
6947 {
6948         int ret;
6949
6950         ASCEBC(dasd_eckd_discipline.ebcname, 4);
6951         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6952                                    GFP_KERNEL | GFP_DMA);
6953         if (!dasd_reserve_req)
6954                 return -ENOMEM;
6955         dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6956                                     GFP_KERNEL | GFP_DMA);
6957         if (!dasd_vol_info_req) {
6958                 kfree(dasd_reserve_req);
6959                 return -ENOMEM;
6960         }
6961         pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6962                                     GFP_KERNEL | GFP_DMA);
6963         if (!pe_handler_worker) {
6964                 kfree(dasd_reserve_req);
6965                 kfree(dasd_vol_info_req);
6966                 return -ENOMEM;
6967         }
6968         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6969         if (!rawpadpage) {
6970                 kfree(pe_handler_worker);
6971                 kfree(dasd_reserve_req);
6972                 kfree(dasd_vol_info_req);
6973                 return -ENOMEM;
6974         }
6975         ret = ccw_driver_register(&dasd_eckd_driver);
6976         if (!ret)
6977                 wait_for_device_probe();
6978         else {
6979                 kfree(pe_handler_worker);
6980                 kfree(dasd_reserve_req);
6981                 kfree(dasd_vol_info_req);
6982                 free_page((unsigned long)rawpadpage);
6983         }
6984         return ret;
6985 }
6986
6987 static void __exit
6988 dasd_eckd_cleanup(void)
6989 {
6990         ccw_driver_unregister(&dasd_eckd_driver);
6991         kfree(pe_handler_worker);
6992         kfree(dasd_reserve_req);
6993         free_page((unsigned long)rawpadpage);
6994 }
6995
6996 module_init(dasd_eckd_init);
6997 module_exit(dasd_eckd_cleanup);