drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <linux/gfp.h>
  17 #include <linux/kernel_stat.h>
  18 #include <asm/atomic.h>
  19 #include <asm/debug.h>
  20 #include <asm/qdio.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(struct subchannel_id schid,
  34                                unsigned int out_mask, unsigned int in_mask)
  35 {
  36         register unsigned long __fc asm ("0") = 2;
  37         register struct subchannel_id __schid asm ("1") = schid;
  38         register unsigned long out asm ("2") = out_mask;
  39         register unsigned long in asm ("3") = in_mask;
  40         int cc;
  41
  42         asm volatile(
  43                 "       siga    0\n"
  44                 "       ipm     %0\n"
  45                 "       srl     %0,28\n"
  46                 : "=d" (cc)
  47                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  48         return cc;
  49 }
  50
  51 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  52 {
  53         register unsigned long __fc asm ("0") = 1;
  54         register struct subchannel_id __schid asm ("1") = schid;
  55         register unsigned long __mask asm ("2") = mask;
  56         int cc;
  57
  58         asm volatile(
  59                 "       siga    0\n"
  60                 "       ipm     %0\n"
  61                 "       srl     %0,28\n"
  62                 : "=d" (cc)
  63                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  64         return cc;
  65 }
  66
  67 /**
  68  * do_siga_output - perform SIGA-w/wt function
  69  * @schid: subchannel id or in case of QEBSM the subchannel token
  70  * @mask: which output queues to process
  71  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  72  * @fc: function code to perform
  73  *
  74  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  75  * Note: For IQDC unicast queues only the highest priority queue is processed.
  76  */
  77 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  78                                  unsigned int *bb, unsigned int fc)
  79 {
  80         register unsigned long __fc asm("0") = fc;
  81         register unsigned long __schid asm("1") = schid;
  82         register unsigned long __mask asm("2") = mask;
  83         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  84
  85         asm volatile(
  86                 "       siga    0\n"
  87                 "0:     ipm     %0\n"
  88                 "       srl     %0,28\n"
  89                 "1:\n"
  90                 EX_TABLE(0b, 1b)
  91                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  92                 : : "cc", "memory");
  93         *bb = ((unsigned int) __fc) >> 31;
  94         return cc;
  95 }
  96
  97 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  98 {
  99         /* all done or next buffer state different */
 100         if (ccq == 0 || ccq == 32)
 101                 return 0;
 102         /* not all buffers processed */
 103         if (ccq == 96 || ccq == 97)
 104                 return 1;
 105         /* notify devices immediately */
 106         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 107         return -EIO;
 108 }
 109
 110 /**
 111  * qdio_do_eqbs - extract buffer states for QEBSM
 112  * @q: queue to manipulate
 113  * @state: state of the extracted buffers
 114  * @start: buffer number to start at
 115  * @count: count of buffers to examine
 116  * @auto_ack: automatically acknowledge buffers
 117  *
 118  * Returns the number of successfully extracted equal buffer states.
 119  * Stops processing if a state is different from the last buffers state.
 120  */
 121 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 122                         int start, int count, int auto_ack)
 123 {
 124         unsigned int ccq = 0;
 125         int tmp_count = count, tmp_start = start;
 126         int nr = q->nr;
 127         int rc;
 128
 129         BUG_ON(!q->irq_ptr->sch_token);
 130         qperf_inc(q, eqbs);
 131
 132         if (!q->is_input_q)
 133                 nr += q->irq_ptr->nr_input_qs;
 134 again:
 135         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 136                       auto_ack);
 137         rc = qdio_check_ccq(q, ccq);
 138
 139         /* At least one buffer was processed, return and extract the remaining
 140          * buffers later.
 141          */
 142         if ((ccq == 96) && (count != tmp_count)) {
 143                 qperf_inc(q, eqbs_partial);
 144                 return (count - tmp_count);
 145         }
 146
 147         if (rc == 1) {
 148                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 149                 goto again;
 150         }
 151
 152         if (rc < 0) {
 153                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 154                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 155                 q->handler(q->irq_ptr->cdev,
 156                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 157                            0, -1, -1, q->irq_ptr->int_parm);
 158                 return 0;
 159         }
 160         return count - tmp_count;
 161 }
 162
 163 /**
 164  * qdio_do_sqbs - set buffer states for QEBSM
 165  * @q: queue to manipulate
 166  * @state: new state of the buffers
 167  * @start: first buffer number to change
 168  * @count: how many buffers to change
 169  *
 170  * Returns the number of successfully changed buffers.
 171  * Does retrying until the specified count of buffer states is set or an
 172  * error occurs.
 173  */
 174 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 175                         int count)
 176 {
 177         unsigned int ccq = 0;
 178         int tmp_count = count, tmp_start = start;
 179         int nr = q->nr;
 180         int rc;
 181
 182         if (!count)
 183                 return 0;
 184
 185         BUG_ON(!q->irq_ptr->sch_token);
 186         qperf_inc(q, sqbs);
 187
 188         if (!q->is_input_q)
 189                 nr += q->irq_ptr->nr_input_qs;
 190 again:
 191         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 192         rc = qdio_check_ccq(q, ccq);
 193         if (rc == 1) {
 194                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 195                 qperf_inc(q, sqbs_partial);
 196                 goto again;
 197         }
 198         if (rc < 0) {
 199                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 200                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 201                 q->handler(q->irq_ptr->cdev,
 202                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 203                            0, -1, -1, q->irq_ptr->int_parm);
 204                 return 0;
 205         }
 206         WARN_ON(tmp_count);
 207         return count - tmp_count;
 208 }
 209
 210 /* returns number of examined buffers and their common state in *state */
 211 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 212                                  unsigned char *state, unsigned int count,
 213                                  int auto_ack)
 214 {
 215         unsigned char __state = 0;
 216         int i;
 217
 218         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 219         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 220
 221         if (is_qebsm(q))
 222                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 223
 224         for (i = 0; i < count; i++) {
 225                 if (!__state)
 226                         __state = q->slsb.val[bufnr];
 227                 else if (q->slsb.val[bufnr] != __state)
 228                         break;
 229                 bufnr = next_buf(bufnr);
 230         }
 231         *state = __state;
 232         return i;
 233 }
 234
 235 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 236                                 unsigned char *state, int auto_ack)
 237 {
 238         return get_buf_states(q, bufnr, state, 1, auto_ack);
 239 }
 240
 241 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 242 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 243                                  unsigned char state, int count)
 244 {
 245         int i;
 246
 247         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 248         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 249
 250         if (is_qebsm(q))
 251                 return qdio_do_sqbs(q, state, bufnr, count);
 252
 253         for (i = 0; i < count; i++) {
 254                 xchg(&q->slsb.val[bufnr], state);
 255                 bufnr = next_buf(bufnr);
 256         }
 257         return count;
 258 }
 259
 260 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 261                                 unsigned char state)
 262 {
 263         return set_buf_states(q, bufnr, state, 1);
 264 }
 265
 266 /* set slsb states to initial state */
 267 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 268 {
 269         struct qdio_q *q;
 270         int i;
 271
 272         for_each_input_queue(irq_ptr, q, i)
 273                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 274                                QDIO_MAX_BUFFERS_PER_Q);
 275         for_each_output_queue(irq_ptr, q, i)
 276                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 277                                QDIO_MAX_BUFFERS_PER_Q);
 278 }
 279
 280 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 281                           unsigned int input)
 282 {
 283         int cc;
 284
 285         if (!need_siga_sync(q))
 286                 return 0;
 287
 288         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 289         qperf_inc(q, siga_sync);
 290
 291         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 292         if (cc)
 293                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 294         return cc;
 295 }
 296
 297 static inline int qdio_siga_sync_q(struct qdio_q *q)
 298 {
 299         if (q->is_input_q)
 300                 return qdio_siga_sync(q, 0, q->mask);
 301         else
 302                 return qdio_siga_sync(q, q->mask, 0);
 303 }
 304
 305 static inline int qdio_siga_sync_out(struct qdio_q *q)
 306 {
 307         return qdio_siga_sync(q, ~0U, 0);
 308 }
 309
 310 static inline int qdio_siga_sync_all(struct qdio_q *q)
 311 {
 312         return qdio_siga_sync(q, ~0U, ~0U);
 313 }
 314
 315 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 316 {
 317         unsigned long schid;
 318         unsigned int fc = 0;
 319         u64 start_time = 0;
 320         int cc;
 321
 322         if (q->u.out.use_enh_siga)
 323                 fc = 3;
 324
 325         if (is_qebsm(q)) {
 326                 schid = q->irq_ptr->sch_token;
 327                 fc |= 0x80;
 328         }
 329         else
 330                 schid = *((u32 *)&q->irq_ptr->schid);
 331
 332 again:
 333         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 334
 335         /* hipersocket busy condition */
 336         if (*busy_bit) {
 337                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 338
 339                 if (!start_time) {
 340                         start_time = get_clock();
 341                         goto again;
 342                 }
 343                 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 344                         goto again;
 345         }
 346         return cc;
 347 }
 348
 349 static inline int qdio_siga_input(struct qdio_q *q)
 350 {
 351         int cc;
 352
 353         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 354         qperf_inc(q, siga_read);
 355
 356         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 357         if (cc)
 358                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 359         return cc;
 360 }
 361
 362 static inline void qdio_sync_after_thinint(struct qdio_q *q)
 363 {
 364         if (pci_out_supported(q)) {
 365                 if (need_siga_sync_thinint(q))
 366                         qdio_siga_sync_all(q);
 367                 else if (need_siga_sync_out_thinint(q))
 368                         qdio_siga_sync_out(q);
 369         } else
 370                 qdio_siga_sync_q(q);
 371 }
 372
 373 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 374                         unsigned char *state)
 375 {
 376         qdio_siga_sync_q(q);
 377         return get_buf_states(q, bufnr, state, 1, 0);
 378 }
 379
 380 static inline void qdio_stop_polling(struct qdio_q *q)
 381 {
 382         if (!q->u.in.polling)
 383                 return;
 384
 385         q->u.in.polling = 0;
 386         qperf_inc(q, stop_polling);
 387
 388         /* show the card that we are not polling anymore */
 389         if (is_qebsm(q)) {
 390                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 391                                q->u.in.ack_count);
 392                 q->u.in.ack_count = 0;
 393         } else
 394                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 395 }
 396
 397 static inline void account_sbals(struct qdio_q *q, int count)
 398 {
 399         int pos = 0;
 400
 401         q->q_stats.nr_sbal_total += count;
 402         if (count == QDIO_MAX_BUFFERS_MASK) {
 403                 q->q_stats.nr_sbals[7]++;
 404                 return;
 405         }
 406         while (count >>= 1)
 407                 pos++;
 408         q->q_stats.nr_sbals[pos]++;
 409 }
 410
 411 static void announce_buffer_error(struct qdio_q *q, int count)
 412 {
 413         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 414
 415         /* special handling for no target buffer empty */
 416         if ((!q->is_input_q &&
 417             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 418                 qperf_inc(q, target_full);
 419                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 420                               q->first_to_check);
 421                 return;
 422         }
 423
 424         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 425         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 426         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 427         DBF_ERROR("F14:%2x F15:%2x",
 428                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 429                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 430 }
 431
 432 static inline void inbound_primed(struct qdio_q *q, int count)
 433 {
 434         int new;
 435
 436         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 437
 438         /* for QEBSM the ACK was already set by EQBS */
 439         if (is_qebsm(q)) {
 440                 if (!q->u.in.polling) {
 441                         q->u.in.polling = 1;
 442                         q->u.in.ack_count = count;
 443                         q->u.in.ack_start = q->first_to_check;
 444                         return;
 445                 }
 446
 447                 /* delete the previous ACK's */
 448                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 449                                q->u.in.ack_count);
 450                 q->u.in.ack_count = count;
 451                 q->u.in.ack_start = q->first_to_check;
 452                 return;
 453         }
 454
 455         /*
 456          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 457          * or by the next inbound run.
 458          */
 459         new = add_buf(q->first_to_check, count - 1);
 460         if (q->u.in.polling) {
 461                 /* reset the previous ACK but first set the new one */
 462                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 463                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 464         } else {
 465                 q->u.in.polling = 1;
 466                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 467         }
 468
 469         q->u.in.ack_start = new;
 470         count--;
 471         if (!count)
 472                 return;
 473         /* need to change ALL buffers to get more interrupts */
 474         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 475 }
 476
 477 static int get_inbound_buffer_frontier(struct qdio_q *q)
 478 {
 479         int count, stop;
 480         unsigned char state;
 481
 482         /*
 483          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 484          * would return 0.
 485          */
 486         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 487         stop = add_buf(q->first_to_check, count);
 488
 489         if (q->first_to_check == stop)
 490                 goto out;
 491
 492         /*
 493          * No siga sync here, as a PCI or we after a thin interrupt
 494          * already sync'ed the queues.
 495          */
 496         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 497         if (!count)
 498                 goto out;
 499
 500         switch (state) {
 501         case SLSB_P_INPUT_PRIMED:
 502                 inbound_primed(q, count);
 503                 q->first_to_check = add_buf(q->first_to_check, count);
 504                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 505                         qperf_inc(q, inbound_queue_full);
 506                 if (q->irq_ptr->perf_stat_enabled)
 507                         account_sbals(q, count);
 508                 break;
 509         case SLSB_P_INPUT_ERROR:
 510                 announce_buffer_error(q, count);
 511                 /* process the buffer, the upper layer will take care of it */
 512                 q->first_to_check = add_buf(q->first_to_check, count);
 513                 atomic_sub(count, &q->nr_buf_used);
 514                 if (q->irq_ptr->perf_stat_enabled)
 515                         account_sbals_error(q, count);
 516                 break;
 517         case SLSB_CU_INPUT_EMPTY:
 518         case SLSB_P_INPUT_NOT_INIT:
 519         case SLSB_P_INPUT_ACK:
 520                 if (q->irq_ptr->perf_stat_enabled)
 521                         q->q_stats.nr_sbal_nop++;
 522                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 523                 break;
 524         default:
 525                 BUG();
 526         }
 527 out:
 528         return q->first_to_check;
 529 }
 530
 531 static int qdio_inbound_q_moved(struct qdio_q *q)
 532 {
 533         int bufnr;
 534
 535         bufnr = get_inbound_buffer_frontier(q);
 536
 537         if ((bufnr != q->last_move) || q->qdio_error) {
 538                 q->last_move = bufnr;
 539                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 540                         q->u.in.timestamp = get_clock();
 541                 return 1;
 542         } else
 543                 return 0;
 544 }
 545
 546 static inline int qdio_inbound_q_done(struct qdio_q *q)
 547 {
 548         unsigned char state = 0;
 549
 550         if (!atomic_read(&q->nr_buf_used))
 551                 return 1;
 552
 553         qdio_siga_sync_q(q);
 554         get_buf_state(q, q->first_to_check, &state, 0);
 555
 556         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 557                 /* more work coming */
 558                 return 0;
 559
 560         if (is_thinint_irq(q->irq_ptr))
 561                 return 1;
 562
 563         /* don't poll under z/VM */
 564         if (MACHINE_IS_VM)
 565                 return 1;
 566
 567         /*
 568          * At this point we know, that inbound first_to_check
 569          * has (probably) not moved (see qdio_inbound_processing).
 570          */
 571         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 572                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 573                               q->first_to_check);
 574                 return 1;
 575         } else
 576                 return 0;
 577 }
 578
 579 static void qdio_kick_handler(struct qdio_q *q)
 580 {
 581         int start = q->first_to_kick;
 582         int end = q->first_to_check;
 583         int count;
 584
 585         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 586                 return;
 587
 588         count = sub_buf(end, start);
 589
 590         if (q->is_input_q) {
 591                 qperf_inc(q, inbound_handler);
 592                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 593         } else {
 594                 qperf_inc(q, outbound_handler);
 595                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 596                               start, count);
 597         }
 598
 599         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 600                    q->irq_ptr->int_parm);
 601
 602         /* for the next time */
 603         q->first_to_kick = end;
 604         q->qdio_error = 0;
 605 }
 606
 607 static void __qdio_inbound_processing(struct qdio_q *q)
 608 {
 609         qperf_inc(q, tasklet_inbound);
 610
 611         if (!qdio_inbound_q_moved(q))
 612                 return;
 613
 614         qdio_kick_handler(q);
 615
 616         if (!qdio_inbound_q_done(q)) {
 617                 /* means poll time is not yet over */
 618                 qperf_inc(q, tasklet_inbound_resched);
 619                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 620                         tasklet_schedule(&q->tasklet);
 621                         return;
 622                 }
 623         }
 624
 625         qdio_stop_polling(q);
 626         /*
 627          * We need to check again to not lose initiative after
 628          * resetting the ACK state.
 629          */
 630         if (!qdio_inbound_q_done(q)) {
 631                 qperf_inc(q, tasklet_inbound_resched2);
 632                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 633                         tasklet_schedule(&q->tasklet);
 634         }
 635 }
 636
 637 void qdio_inbound_processing(unsigned long data)
 638 {
 639         struct qdio_q *q = (struct qdio_q *)data;
 640         __qdio_inbound_processing(q);
 641 }
 642
 643 static int get_outbound_buffer_frontier(struct qdio_q *q)
 644 {
 645         int count, stop;
 646         unsigned char state;
 647
 648         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 649             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 650                 qdio_siga_sync_q(q);
 651
 652         /*
 653          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 654          * would return 0.
 655          */
 656         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 657         stop = add_buf(q->first_to_check, count);
 658
 659         if (q->first_to_check == stop)
 660                 return q->first_to_check;
 661
 662         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 663         if (!count)
 664                 return q->first_to_check;
 665
 666         switch (state) {
 667         case SLSB_P_OUTPUT_EMPTY:
 668                 /* the adapter got it */
 669                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 670
 671                 atomic_sub(count, &q->nr_buf_used);
 672                 q->first_to_check = add_buf(q->first_to_check, count);
 673                 if (q->irq_ptr->perf_stat_enabled)
 674                         account_sbals(q, count);
 675                 break;
 676         case SLSB_P_OUTPUT_ERROR:
 677                 announce_buffer_error(q, count);
 678                 /* process the buffer, the upper layer will take care of it */
 679                 q->first_to_check = add_buf(q->first_to_check, count);
 680                 atomic_sub(count, &q->nr_buf_used);
 681                 if (q->irq_ptr->perf_stat_enabled)
 682                         account_sbals_error(q, count);
 683                 break;
 684         case SLSB_CU_OUTPUT_PRIMED:
 685                 /* the adapter has not fetched the output yet */
 686                 if (q->irq_ptr->perf_stat_enabled)
 687                         q->q_stats.nr_sbal_nop++;
 688                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 689                 break;
 690         case SLSB_P_OUTPUT_NOT_INIT:
 691         case SLSB_P_OUTPUT_HALTED:
 692                 break;
 693         default:
 694                 BUG();
 695         }
 696         return q->first_to_check;
 697 }
 698
 699 /* all buffers processed? */
 700 static inline int qdio_outbound_q_done(struct qdio_q *q)
 701 {
 702         return atomic_read(&q->nr_buf_used) == 0;
 703 }
 704
 705 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 706 {
 707         int bufnr;
 708
 709         bufnr = get_outbound_buffer_frontier(q);
 710
 711         if ((bufnr != q->last_move) || q->qdio_error) {
 712                 q->last_move = bufnr;
 713                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 714                 return 1;
 715         } else
 716                 return 0;
 717 }
 718
 719 static int qdio_kick_outbound_q(struct qdio_q *q)
 720 {
 721         unsigned int busy_bit;
 722         int cc;
 723
 724         if (!need_siga_out(q))
 725                 return 0;
 726
 727         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 728         qperf_inc(q, siga_write);
 729
 730         cc = qdio_siga_output(q, &busy_bit);
 731         switch (cc) {
 732         case 0:
 733                 break;
 734         case 2:
 735                 if (busy_bit) {
 736                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 737                         cc |= QDIO_ERROR_SIGA_BUSY;
 738                 } else
 739                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 740                 break;
 741         case 1:
 742         case 3:
 743                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 744                 break;
 745         }
 746         return cc;
 747 }
 748
 749 static void __qdio_outbound_processing(struct qdio_q *q)
 750 {
 751         qperf_inc(q, tasklet_outbound);
 752         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 753
 754         if (qdio_outbound_q_moved(q))
 755                 qdio_kick_handler(q);
 756
 757         if (queue_type(q) == QDIO_ZFCP_QFMT)
 758                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 759                         goto sched;
 760
 761         /* bail out for HiperSockets unicast queues */
 762         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 763                 return;
 764
 765         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 766             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 767                 goto sched;
 768
 769         if (q->u.out.pci_out_enabled)
 770                 return;
 771
 772         /*
 773          * Now we know that queue type is either qeth without pci enabled
 774          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 775          * EMPTY is noticed and outbound_handler is called after some time.
 776          */
 777         if (qdio_outbound_q_done(q))
 778                 del_timer(&q->u.out.timer);
 779         else
 780                 if (!timer_pending(&q->u.out.timer))
 781                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 782         return;
 783
 784 sched:
 785         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 786                 return;
 787         tasklet_schedule(&q->tasklet);
 788 }
 789
 790 /* outbound tasklet */
 791 void qdio_outbound_processing(unsigned long data)
 792 {
 793         struct qdio_q *q = (struct qdio_q *)data;
 794         __qdio_outbound_processing(q);
 795 }
 796
 797 void qdio_outbound_timer(unsigned long data)
 798 {
 799         struct qdio_q *q = (struct qdio_q *)data;
 800
 801         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 802                 return;
 803         tasklet_schedule(&q->tasklet);
 804 }
 805
 806 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 807 {
 808         struct qdio_q *out;
 809         int i;
 810
 811         if (!pci_out_supported(q))
 812                 return;
 813
 814         for_each_output_queue(q->irq_ptr, out, i)
 815                 if (!qdio_outbound_q_done(out))
 816                         tasklet_schedule(&out->tasklet);
 817 }
 818
 819 static void __tiqdio_inbound_processing(struct qdio_q *q)
 820 {
 821         qperf_inc(q, tasklet_inbound);
 822         qdio_sync_after_thinint(q);
 823
 824         /*
 825          * The interrupt could be caused by a PCI request. Check the
 826          * PCI capable outbound queues.
 827          */
 828         qdio_check_outbound_after_thinint(q);
 829
 830         if (!qdio_inbound_q_moved(q))
 831                 return;
 832
 833         qdio_kick_handler(q);
 834
 835         if (!qdio_inbound_q_done(q)) {
 836                 qperf_inc(q, tasklet_inbound_resched);
 837                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 838                         tasklet_schedule(&q->tasklet);
 839                         return;
 840                 }
 841         }
 842
 843         qdio_stop_polling(q);
 844         /*
 845          * We need to check again to not lose initiative after
 846          * resetting the ACK state.
 847          */
 848         if (!qdio_inbound_q_done(q)) {
 849                 qperf_inc(q, tasklet_inbound_resched2);
 850                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 851                         tasklet_schedule(&q->tasklet);
 852         }
 853 }
 854
 855 void tiqdio_inbound_processing(unsigned long data)
 856 {
 857         struct qdio_q *q = (struct qdio_q *)data;
 858         __tiqdio_inbound_processing(q);
 859 }
 860
 861 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 862                                   enum qdio_irq_states state)
 863 {
 864         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 865
 866         irq_ptr->state = state;
 867         mb();
 868 }
 869
 870 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 871 {
 872         if (irb->esw.esw0.erw.cons) {
 873                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 874                 DBF_ERROR_HEX(irb, 64);
 875                 DBF_ERROR_HEX(irb->ecw, 64);
 876         }
 877 }
 878
 879 /* PCI interrupt handler */
 880 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 881 {
 882         int i;
 883         struct qdio_q *q;
 884
 885         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 886                 return;
 887
 888         for_each_input_queue(irq_ptr, q, i) {
 889                 if (q->u.in.queue_start_poll) {
 890                         /* skip if polling is enabled or already in work */
 891                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 892                                      &q->u.in.queue_irq_state)) {
 893                                 qperf_inc(q, int_discarded);
 894                                 continue;
 895                         }
 896                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 897                                                  q->irq_ptr->int_parm);
 898                 } else
 899                         tasklet_schedule(&q->tasklet);
 900         }
 901
 902         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 903                 return;
 904
 905         for_each_output_queue(irq_ptr, q, i) {
 906                 if (qdio_outbound_q_done(q))
 907                         continue;
 908
 909                 if (!siga_syncs_out_pci(q))
 910                         qdio_siga_sync_q(q);
 911
 912                 tasklet_schedule(&q->tasklet);
 913         }
 914 }
 915
 916 static void qdio_handle_activate_check(struct ccw_device *cdev,
 917                                 unsigned long intparm, int cstat, int dstat)
 918 {
 919         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 920         struct qdio_q *q;
 921
 922         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 923         DBF_ERROR("intp :%lx", intparm);
 924         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 925
 926         if (irq_ptr->nr_input_qs) {
 927                 q = irq_ptr->input_qs[0];
 928         } else if (irq_ptr->nr_output_qs) {
 929                 q = irq_ptr->output_qs[0];
 930         } else {
 931                 dump_stack();
 932                 goto no_handler;
 933         }
 934         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 935                    0, -1, -1, irq_ptr->int_parm);
 936 no_handler:
 937         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 938 }
 939
 940 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 941                                       int dstat)
 942 {
 943         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 944
 945         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 946
 947         if (cstat)
 948                 goto error;
 949         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 950                 goto error;
 951         if (!(dstat & DEV_STAT_DEV_END))
 952                 goto error;
 953         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 954         return;
 955
 956 error:
 957         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 958         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 959         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 960 }
 961
 962 /* qdio interrupt handler */
 963 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 964                       struct irb *irb)
 965 {
 966         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 967         int cstat, dstat;
 968
 969         if (!intparm || !irq_ptr) {
 970                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 971                 return;
 972         }
 973
 974         kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++;
 975         if (irq_ptr->perf_stat_enabled)
 976                 irq_ptr->perf_stat.qdio_int++;
 977
 978         if (IS_ERR(irb)) {
 979                 switch (PTR_ERR(irb)) {
 980                 case -EIO:
 981                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 982                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 983                         wake_up(&cdev->private->wait_q);
 984                         return;
 985                 default:
 986                         WARN_ON(1);
 987                         return;
 988                 }
 989         }
 990         qdio_irq_check_sense(irq_ptr, irb);
 991         cstat = irb->scsw.cmd.cstat;
 992         dstat = irb->scsw.cmd.dstat;
 993
 994         switch (irq_ptr->state) {
 995         case QDIO_IRQ_STATE_INACTIVE:
 996                 qdio_establish_handle_irq(cdev, cstat, dstat);
 997                 break;
 998         case QDIO_IRQ_STATE_CLEANUP:
 999                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1000                 break;
1001         case QDIO_IRQ_STATE_ESTABLISHED:
1002         case QDIO_IRQ_STATE_ACTIVE:
1003                 if (cstat & SCHN_STAT_PCI) {
1004                         qdio_int_handler_pci(irq_ptr);
1005                         return;
1006                 }
1007                 if (cstat || dstat)
1008                         qdio_handle_activate_check(cdev, intparm, cstat,
1009                                                    dstat);
1010                 break;
1011         case QDIO_IRQ_STATE_STOPPED:
1012                 break;
1013         default:
1014                 WARN_ON(1);
1015         }
1016         wake_up(&cdev->private->wait_q);
1017 }
1018
1019 /**
1020  * qdio_get_ssqd_desc - get qdio subchannel description
1021  * @cdev: ccw device to get description for
1022  * @data: where to store the ssqd
1023  *
1024  * Returns 0 or an error code. The results of the chsc are stored in the
1025  * specified structure.
1026  */
1027 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1028                        struct qdio_ssqd_desc *data)
1029 {
1030
1031         if (!cdev || !cdev->private)
1032                 return -EINVAL;
1033
1034         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1035         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1036 }
1037 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1038
1039 static void qdio_shutdown_queues(struct ccw_device *cdev)
1040 {
1041         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1042         struct qdio_q *q;
1043         int i;
1044
1045         for_each_input_queue(irq_ptr, q, i)
1046                 tasklet_kill(&q->tasklet);
1047
1048         for_each_output_queue(irq_ptr, q, i) {
1049                 del_timer(&q->u.out.timer);
1050                 tasklet_kill(&q->tasklet);
1051         }
1052 }
1053
1054 /**
1055  * qdio_shutdown - shut down a qdio subchannel
1056  * @cdev: associated ccw device
1057  * @how: use halt or clear to shutdown
1058  */
1059 int qdio_shutdown(struct ccw_device *cdev, int how)
1060 {
1061         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1062         int rc;
1063         unsigned long flags;
1064
1065         if (!irq_ptr)
1066                 return -ENODEV;
1067
1068         BUG_ON(irqs_disabled());
1069         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1070
1071         mutex_lock(&irq_ptr->setup_mutex);
1072         /*
1073          * Subchannel was already shot down. We cannot prevent being called
1074          * twice since cio may trigger a shutdown asynchronously.
1075          */
1076         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1077                 mutex_unlock(&irq_ptr->setup_mutex);
1078                 return 0;
1079         }
1080
1081         /*
1082          * Indicate that the device is going down. Scheduling the queue
1083          * tasklets is forbidden from here on.
1084          */
1085         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1086
1087         tiqdio_remove_input_queues(irq_ptr);
1088         qdio_shutdown_queues(cdev);
1089         qdio_shutdown_debug_entries(irq_ptr, cdev);
1090
1091         /* cleanup subchannel */
1092         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1093
1094         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1095                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1096         else
1097                 /* default behaviour is halt */
1098                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1099         if (rc) {
1100                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1101                 DBF_ERROR("rc:%4d", rc);
1102                 goto no_cleanup;
1103         }
1104
1105         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1106         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1107         wait_event_interruptible_timeout(cdev->private->wait_q,
1108                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1109                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1110                 10 * HZ);
1111         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1112
1113 no_cleanup:
1114         qdio_shutdown_thinint(irq_ptr);
1115
1116         /* restore interrupt handler */
1117         if ((void *)cdev->handler == (void *)qdio_int_handler)
1118                 cdev->handler = irq_ptr->orig_handler;
1119         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1120
1121         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1122         mutex_unlock(&irq_ptr->setup_mutex);
1123         if (rc)
1124                 return rc;
1125         return 0;
1126 }
1127 EXPORT_SYMBOL_GPL(qdio_shutdown);
1128
1129 /**
1130  * qdio_free - free data structures for a qdio subchannel
1131  * @cdev: associated ccw device
1132  */
1133 int qdio_free(struct ccw_device *cdev)
1134 {
1135         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1136
1137         if (!irq_ptr)
1138                 return -ENODEV;
1139
1140         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1141         mutex_lock(&irq_ptr->setup_mutex);
1142
1143         if (irq_ptr->debug_area != NULL) {
1144                 debug_unregister(irq_ptr->debug_area);
1145                 irq_ptr->debug_area = NULL;
1146         }
1147         cdev->private->qdio_data = NULL;
1148         mutex_unlock(&irq_ptr->setup_mutex);
1149
1150         qdio_release_memory(irq_ptr);
1151         return 0;
1152 }
1153 EXPORT_SYMBOL_GPL(qdio_free);
1154
1155 /**
1156  * qdio_allocate - allocate qdio queues and associated data
1157  * @init_data: initialization data
1158  */
1159 int qdio_allocate(struct qdio_initialize *init_data)
1160 {
1161         struct qdio_irq *irq_ptr;
1162
1163         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1164
1165         if ((init_data->no_input_qs && !init_data->input_handler) ||
1166             (init_data->no_output_qs && !init_data->output_handler))
1167                 return -EINVAL;
1168
1169         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1170             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1171                 return -EINVAL;
1172
1173         if ((!init_data->input_sbal_addr_array) ||
1174             (!init_data->output_sbal_addr_array))
1175                 return -EINVAL;
1176
1177         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1178         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1179         if (!irq_ptr)
1180                 goto out_err;
1181
1182         mutex_init(&irq_ptr->setup_mutex);
1183         qdio_allocate_dbf(init_data, irq_ptr);
1184
1185         /*
1186          * Allocate a page for the chsc calls in qdio_establish.
1187          * Must be pre-allocated since a zfcp recovery will call
1188          * qdio_establish. In case of low memory and swap on a zfcp disk
1189          * we may not be able to allocate memory otherwise.
1190          */
1191         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1192         if (!irq_ptr->chsc_page)
1193                 goto out_rel;
1194
1195         /* qdr is used in ccw1.cda which is u32 */
1196         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1197         if (!irq_ptr->qdr)
1198                 goto out_rel;
1199         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1200
1201         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1202                              init_data->no_output_qs))
1203                 goto out_rel;
1204
1205         init_data->cdev->private->qdio_data = irq_ptr;
1206         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1207         return 0;
1208 out_rel:
1209         qdio_release_memory(irq_ptr);
1210 out_err:
1211         return -ENOMEM;
1212 }
1213 EXPORT_SYMBOL_GPL(qdio_allocate);
1214
1215 /**
1216  * qdio_establish - establish queues on a qdio subchannel
1217  * @init_data: initialization data
1218  */
1219 int qdio_establish(struct qdio_initialize *init_data)
1220 {
1221         struct qdio_irq *irq_ptr;
1222         struct ccw_device *cdev = init_data->cdev;
1223         unsigned long saveflags;
1224         int rc;
1225
1226         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1227
1228         irq_ptr = cdev->private->qdio_data;
1229         if (!irq_ptr)
1230                 return -ENODEV;
1231
1232         if (cdev->private->state != DEV_STATE_ONLINE)
1233                 return -EINVAL;
1234
1235         mutex_lock(&irq_ptr->setup_mutex);
1236         qdio_setup_irq(init_data);
1237
1238         rc = qdio_establish_thinint(irq_ptr);
1239         if (rc) {
1240                 mutex_unlock(&irq_ptr->setup_mutex);
1241                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1242                 return rc;
1243         }
1244
1245         /* establish q */
1246         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1247         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1248         irq_ptr->ccw.count = irq_ptr->equeue.count;
1249         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1250
1251         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1252         ccw_device_set_options_mask(cdev, 0);
1253
1254         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1255         if (rc) {
1256                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1257                 DBF_ERROR("rc:%4x", rc);
1258         }
1259         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1260
1261         if (rc) {
1262                 mutex_unlock(&irq_ptr->setup_mutex);
1263                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1264                 return rc;
1265         }
1266
1267         wait_event_interruptible_timeout(cdev->private->wait_q,
1268                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1269                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1270
1271         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1272                 mutex_unlock(&irq_ptr->setup_mutex);
1273                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1274                 return -EIO;
1275         }
1276
1277         qdio_setup_ssqd_info(irq_ptr);
1278         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1279         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1280
1281         /* qebsm is now setup if available, initialize buffer states */
1282         qdio_init_buf_states(irq_ptr);
1283
1284         mutex_unlock(&irq_ptr->setup_mutex);
1285         qdio_print_subchannel_info(irq_ptr, cdev);
1286         qdio_setup_debug_entries(irq_ptr, cdev);
1287         return 0;
1288 }
1289 EXPORT_SYMBOL_GPL(qdio_establish);
1290
1291 /**
1292  * qdio_activate - activate queues on a qdio subchannel
1293  * @cdev: associated cdev
1294  */
1295 int qdio_activate(struct ccw_device *cdev)
1296 {
1297         struct qdio_irq *irq_ptr;
1298         int rc;
1299         unsigned long saveflags;
1300
1301         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1302
1303         irq_ptr = cdev->private->qdio_data;
1304         if (!irq_ptr)
1305                 return -ENODEV;
1306
1307         if (cdev->private->state != DEV_STATE_ONLINE)
1308                 return -EINVAL;
1309
1310         mutex_lock(&irq_ptr->setup_mutex);
1311         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1312                 rc = -EBUSY;
1313                 goto out;
1314         }
1315
1316         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1317         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1318         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1319         irq_ptr->ccw.cda = 0;
1320
1321         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1322         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1323
1324         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1325                               0, DOIO_DENY_PREFETCH);
1326         if (rc) {
1327                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1328                 DBF_ERROR("rc:%4x", rc);
1329         }
1330         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1331
1332         if (rc)
1333                 goto out;
1334
1335         if (is_thinint_irq(irq_ptr))
1336                 tiqdio_add_input_queues(irq_ptr);
1337
1338         /* wait for subchannel to become active */
1339         msleep(5);
1340
1341         switch (irq_ptr->state) {
1342         case QDIO_IRQ_STATE_STOPPED:
1343         case QDIO_IRQ_STATE_ERR:
1344                 rc = -EIO;
1345                 break;
1346         default:
1347                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1348                 rc = 0;
1349         }
1350 out:
1351         mutex_unlock(&irq_ptr->setup_mutex);
1352         return rc;
1353 }
1354 EXPORT_SYMBOL_GPL(qdio_activate);
1355
1356 static inline int buf_in_between(int bufnr, int start, int count)
1357 {
1358         int end = add_buf(start, count);
1359
1360         if (end > start) {
1361                 if (bufnr >= start && bufnr < end)
1362                         return 1;
1363                 else
1364                         return 0;
1365         }
1366
1367         /* wrap-around case */
1368         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1369             (bufnr < end))
1370                 return 1;
1371         else
1372                 return 0;
1373 }
1374
1375 /**
1376  * handle_inbound - reset processed input buffers
1377  * @q: queue containing the buffers
1378  * @callflags: flags
1379  * @bufnr: first buffer to process
1380  * @count: how many buffers are emptied
1381  */
1382 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1383                           int bufnr, int count)
1384 {
1385         int used, diff;
1386
1387         qperf_inc(q, inbound_call);
1388
1389         if (!q->u.in.polling)
1390                 goto set;
1391
1392         /* protect against stop polling setting an ACK for an emptied slsb */
1393         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1394                 /* overwriting everything, just delete polling status */
1395                 q->u.in.polling = 0;
1396                 q->u.in.ack_count = 0;
1397                 goto set;
1398         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1399                 if (is_qebsm(q)) {
1400                         /* partial overwrite, just update ack_start */
1401                         diff = add_buf(bufnr, count);
1402                         diff = sub_buf(diff, q->u.in.ack_start);
1403                         q->u.in.ack_count -= diff;
1404                         if (q->u.in.ack_count <= 0) {
1405                                 q->u.in.polling = 0;
1406                                 q->u.in.ack_count = 0;
1407                                 goto set;
1408                         }
1409                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1410                 }
1411                 else
1412                         /* the only ACK will be deleted, so stop polling */
1413                         q->u.in.polling = 0;
1414         }
1415
1416 set:
1417         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1418
1419         used = atomic_add_return(count, &q->nr_buf_used) - count;
1420         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1421
1422         /* no need to signal as long as the adapter had free buffers */
1423         if (used)
1424                 return 0;
1425
1426         if (need_siga_in(q))
1427                 return qdio_siga_input(q);
1428         return 0;
1429 }
1430
1431 /**
1432  * handle_outbound - process filled outbound buffers
1433  * @q: queue containing the buffers
1434  * @callflags: flags
1435  * @bufnr: first buffer to process
1436  * @count: how many buffers are filled
1437  */
1438 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1439                            int bufnr, int count)
1440 {
1441         unsigned char state;
1442         int used, rc = 0;
1443
1444         qperf_inc(q, outbound_call);
1445
1446         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1447         used = atomic_add_return(count, &q->nr_buf_used);
1448         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1449
1450         if (used == QDIO_MAX_BUFFERS_PER_Q)
1451                 qperf_inc(q, outbound_queue_full);
1452
1453         if (callflags & QDIO_FLAG_PCI_OUT) {
1454                 q->u.out.pci_out_enabled = 1;
1455                 qperf_inc(q, pci_request_int);
1456         }
1457         else
1458                 q->u.out.pci_out_enabled = 0;
1459
1460         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1461                 if (multicast_outbound(q))
1462                         rc = qdio_kick_outbound_q(q);
1463                 else
1464                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1465                             (count > 1) &&
1466                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1467                                 /* exploit enhanced SIGA */
1468                                 q->u.out.use_enh_siga = 1;
1469                                 rc = qdio_kick_outbound_q(q);
1470                         } else {
1471                                 /*
1472                                 * One siga-w per buffer required for unicast
1473                                 * HiperSockets.
1474                                 */
1475                                 q->u.out.use_enh_siga = 0;
1476                                 while (count--) {
1477                                         rc = qdio_kick_outbound_q(q);
1478                                         if (rc)
1479                                                 goto out;
1480                                 }
1481                         }
1482                 goto out;
1483         }
1484
1485         if (need_siga_sync(q)) {
1486                 qdio_siga_sync_q(q);
1487                 goto out;
1488         }
1489
1490         /* try to fast requeue buffers */
1491         get_buf_state(q, prev_buf(bufnr), &state, 0);
1492         if (state != SLSB_CU_OUTPUT_PRIMED)
1493                 rc = qdio_kick_outbound_q(q);
1494         else
1495                 qperf_inc(q, fast_requeue);
1496
1497 out:
1498         /* in case of SIGA errors we must process the error immediately */
1499         if (used >= q->u.out.scan_threshold || rc)
1500                 tasklet_schedule(&q->tasklet);
1501         else
1502                 /* free the SBALs in case of no further traffic */
1503                 if (!timer_pending(&q->u.out.timer))
1504                         mod_timer(&q->u.out.timer, jiffies + HZ);
1505         return rc;
1506 }
1507
1508 /**
1509  * do_QDIO - process input or output buffers
1510  * @cdev: associated ccw_device for the qdio subchannel
1511  * @callflags: input or output and special flags from the program
1512  * @q_nr: queue number
1513  * @bufnr: buffer number
1514  * @count: how many buffers to process
1515  */
1516 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1517             int q_nr, unsigned int bufnr, unsigned int count)
1518 {
1519         struct qdio_irq *irq_ptr;
1520
1521         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1522                 return -EINVAL;
1523
1524         irq_ptr = cdev->private->qdio_data;
1525         if (!irq_ptr)
1526                 return -ENODEV;
1527
1528         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1529                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1530
1531         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1532                 return -EBUSY;
1533
1534         if (callflags & QDIO_FLAG_SYNC_INPUT)
1535                 return handle_inbound(irq_ptr->input_qs[q_nr],
1536                                       callflags, bufnr, count);
1537         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1538                 return handle_outbound(irq_ptr->output_qs[q_nr],
1539                                        callflags, bufnr, count);
1540         return -EINVAL;
1541 }
1542 EXPORT_SYMBOL_GPL(do_QDIO);
1543
1544 /**
1545  * qdio_start_irq - process input buffers
1546  * @cdev: associated ccw_device for the qdio subchannel
1547  * @nr: input queue number
1548  *
1549  * Return codes
1550  *   0 - success
1551  *   1 - irqs not started since new data is available
1552  */
1553 int qdio_start_irq(struct ccw_device *cdev, int nr)
1554 {
1555         struct qdio_q *q;
1556         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1557
1558         if (!irq_ptr)
1559                 return -ENODEV;
1560         q = irq_ptr->input_qs[nr];
1561
1562         WARN_ON(queue_irqs_enabled(q));
1563
1564         if (!shared_ind(q->irq_ptr->dsci))
1565                 xchg(q->irq_ptr->dsci, 0);
1566
1567         qdio_stop_polling(q);
1568         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1569
1570         /*
1571          * We need to check again to not lose initiative after
1572          * resetting the ACK state.
1573          */
1574         if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci)
1575                 goto rescan;
1576         if (!qdio_inbound_q_done(q))
1577                 goto rescan;
1578         return 0;
1579
1580 rescan:
1581         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1582                              &q->u.in.queue_irq_state))
1583                 return 0;
1584         else
1585                 return 1;
1586
1587 }
1588 EXPORT_SYMBOL(qdio_start_irq);
1589
1590 /**
1591  * qdio_get_next_buffers - process input buffers
1592  * @cdev: associated ccw_device for the qdio subchannel
1593  * @nr: input queue number
1594  * @bufnr: first filled buffer number
1595  * @error: buffers are in error state
1596  *
1597  * Return codes
1598  *   < 0 - error
1599  *   = 0 - no new buffers found
1600  *   > 0 - number of processed buffers
1601  */
1602 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1603                           int *error)
1604 {
1605         struct qdio_q *q;
1606         int start, end;
1607         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1608
1609         if (!irq_ptr)
1610                 return -ENODEV;
1611         q = irq_ptr->input_qs[nr];
1612         WARN_ON(queue_irqs_enabled(q));
1613
1614         qdio_sync_after_thinint(q);
1615
1616         /*
1617          * The interrupt could be caused by a PCI request. Check the
1618          * PCI capable outbound queues.
1619          */
1620         qdio_check_outbound_after_thinint(q);
1621
1622         if (!qdio_inbound_q_moved(q))
1623                 return 0;
1624
1625         /* Note: upper-layer MUST stop processing immediately here ... */
1626         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1627                 return -EIO;
1628
1629         start = q->first_to_kick;
1630         end = q->first_to_check;
1631         *bufnr = start;
1632         *error = q->qdio_error;
1633
1634         /* for the next time */
1635         q->first_to_kick = end;
1636         q->qdio_error = 0;
1637         return sub_buf(end, start);
1638 }
1639 EXPORT_SYMBOL(qdio_get_next_buffers);
1640
1641 /**
1642  * qdio_stop_irq - disable interrupt processing for the device
1643  * @cdev: associated ccw_device for the qdio subchannel
1644  * @nr: input queue number
1645  *
1646  * Return codes
1647  *   0 - interrupts were already disabled
1648  *   1 - interrupts successfully disabled
1649  */
1650 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1651 {
1652         struct qdio_q *q;
1653         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1654
1655         if (!irq_ptr)
1656                 return -ENODEV;
1657         q = irq_ptr->input_qs[nr];
1658
1659         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1660                              &q->u.in.queue_irq_state))
1661                 return 0;
1662         else
1663                 return 1;
1664 }
1665 EXPORT_SYMBOL(qdio_stop_irq);
1666
1667 static int __init init_QDIO(void)
1668 {
1669         int rc;
1670
1671         rc = qdio_setup_init();
1672         if (rc)
1673                 return rc;
1674         rc = tiqdio_allocate_memory();
1675         if (rc)
1676                 goto out_cache;
1677         rc = qdio_debug_init();
1678         if (rc)
1679                 goto out_ti;
1680         rc = tiqdio_register_thinints();
1681         if (rc)
1682                 goto out_debug;
1683         return 0;
1684
1685 out_debug:
1686         qdio_debug_exit();
1687 out_ti:
1688         tiqdio_free_memory();
1689 out_cache:
1690         qdio_setup_exit();
1691         return rc;
1692 }
1693
1694 static void __exit exit_QDIO(void)
1695 {
1696         tiqdio_unregister_thinints();
1697         tiqdio_free_memory();
1698         qdio_debug_exit();
1699         qdio_setup_exit();
1700 }
1701
1702 module_init(init_QDIO);
1703 module_exit(exit_QDIO);