drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50 #ifdef MODULE_PARAM_PREFIX
  51 #undef MODULE_PARAM_PREFIX
  52 #endif
  53 #define MODULE_PARAM_PREFIX "mmcblk."
  54
  55 #define INAND_CMD38_ARG_EXT_CSD  113
  56 #define INAND_CMD38_ARG_ERASE    0x00
  57 #define INAND_CMD38_ARG_TRIM     0x01
  58 #define INAND_CMD38_ARG_SECERASE 0x80
  59 #define INAND_CMD38_ARG_SECTRIM1 0x81
  60 #define INAND_CMD38_ARG_SECTRIM2 0x88
  61 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  62 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  63 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  64
  65 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
  66                                   (req->cmd_flags & REQ_META)) && \
  67                                   (rq_data_dir(req) == WRITE))
  68 #define PACKED_CMD_VER  0x01
  69 #define PACKED_CMD_WR   0x02
  70
  71 static DEFINE_MUTEX(block_mutex);
  72
  73 /*
  74  * The defaults come from config options but can be overriden by module
  75  * or bootarg options.
  76  */
  77 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  78
  79 /*
  80  * We've only got one major, so number of mmcblk devices is
  81  * limited to (1 << 20) / number of minors per device.  It is also
  82  * currently limited by the size of the static bitmaps below.
  83  */
  84 static int max_devices;
  85
  86 #define MAX_DEVICES 256
  87
  88 /* TODO: Replace these with struct ida */
  89 static DECLARE_BITMAP(dev_use, MAX_DEVICES);
  90 static DECLARE_BITMAP(name_use, MAX_DEVICES);
  91
  92 /*
  93  * There is one mmc_blk_data per slot.
  94  */
  95 struct mmc_blk_data {
  96         spinlock_t      lock;
  97         struct gendisk  *disk;
  98         struct mmc_queue queue;
  99         struct list_head part;
 100
 101         unsigned int    flags;
 102 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 103 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 104 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 105
 106         unsigned int    usage;
 107         unsigned int    read_only;
 108         unsigned int    part_type;
 109         unsigned int    name_idx;
 110         unsigned int    reset_done;
 111 #define MMC_BLK_READ            BIT(0)
 112 #define MMC_BLK_WRITE           BIT(1)
 113 #define MMC_BLK_DISCARD         BIT(2)
 114 #define MMC_BLK_SECDISCARD      BIT(3)
 115
 116         /*
 117          * Only set in main mmc_blk_data associated
 118          * with mmc_card with dev_set_drvdata, and keeps
 119          * track of the current selected device partition.
 120          */
 121         unsigned int    part_curr;
 122         struct device_attribute force_ro;
 123         struct device_attribute power_ro_lock;
 124         int     area_type;
 125 };
 126
 127 static DEFINE_MUTEX(open_lock);
 128
 129 enum {
 130         MMC_PACKED_NR_IDX = -1,
 131         MMC_PACKED_NR_ZERO,
 132         MMC_PACKED_NR_SINGLE,
 133 };
 134
 135 module_param(perdev_minors, int, 0444);
 136 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 137
 138 static inline int mmc_blk_part_switch(struct mmc_card *card,
 139                                       struct mmc_blk_data *md);
 140 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 141
 142 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 143 {
 144         struct mmc_packed *packed = mqrq->packed;
 145
 146         BUG_ON(!packed);
 147
 148         mqrq->cmd_type = MMC_PACKED_NONE;
 149         packed->nr_entries = MMC_PACKED_NR_ZERO;
 150         packed->idx_failure = MMC_PACKED_NR_IDX;
 151         packed->retries = 0;
 152         packed->blocks = 0;
 153 }
 154
 155 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 156 {
 157         struct mmc_blk_data *md;
 158
 159         mutex_lock(&open_lock);
 160         md = disk->private_data;
 161         if (md && md->usage == 0)
 162                 md = NULL;
 163         if (md)
 164                 md->usage++;
 165         mutex_unlock(&open_lock);
 166
 167         return md;
 168 }
 169
 170 static inline int mmc_get_devidx(struct gendisk *disk)
 171 {
 172         int devmaj = MAJOR(disk_devt(disk));
 173         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 174
 175         if (!devmaj)
 176                 devidx = disk->first_minor / perdev_minors;
 177         return devidx;
 178 }
 179
 180 static void mmc_blk_put(struct mmc_blk_data *md)
 181 {
 182         mutex_lock(&open_lock);
 183         md->usage--;
 184         if (md->usage == 0) {
 185                 int devidx = mmc_get_devidx(md->disk);
 186                 blk_cleanup_queue(md->queue.queue);
 187
 188                 __clear_bit(devidx, dev_use);
 189
 190                 put_disk(md->disk);
 191                 kfree(md);
 192         }
 193         mutex_unlock(&open_lock);
 194 }
 195
 196 static ssize_t power_ro_lock_show(struct device *dev,
 197                 struct device_attribute *attr, char *buf)
 198 {
 199         int ret;
 200         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 201         struct mmc_card *card = md->queue.card;
 202         int locked = 0;
 203
 204         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 205                 locked = 2;
 206         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 207                 locked = 1;
 208
 209         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 210
 211         return ret;
 212 }
 213
 214 static ssize_t power_ro_lock_store(struct device *dev,
 215                 struct device_attribute *attr, const char *buf, size_t count)
 216 {
 217         int ret;
 218         struct mmc_blk_data *md, *part_md;
 219         struct mmc_card *card;
 220         unsigned long set;
 221
 222         if (kstrtoul(buf, 0, &set))
 223                 return -EINVAL;
 224
 225         if (set != 1)
 226                 return count;
 227
 228         md = mmc_blk_get(dev_to_disk(dev));
 229         card = md->queue.card;
 230
 231         mmc_get_card(card);
 232
 233         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 234                                 card->ext_csd.boot_ro_lock |
 235                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 236                                 card->ext_csd.part_time);
 237         if (ret)
 238                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 239         else
 240                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 241
 242         mmc_put_card(card);
 243
 244         if (!ret) {
 245                 pr_info("%s: Locking boot partition ro until next power on\n",
 246                         md->disk->disk_name);
 247                 set_disk_ro(md->disk, 1);
 248
 249                 list_for_each_entry(part_md, &md->part, part)
 250                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 251                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 252                                 set_disk_ro(part_md->disk, 1);
 253                         }
 254         }
 255
 256         mmc_blk_put(md);
 257         return count;
 258 }
 259
 260 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 261                              char *buf)
 262 {
 263         int ret;
 264         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 265
 266         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 267                        get_disk_ro(dev_to_disk(dev)) ^
 268                        md->read_only);
 269         mmc_blk_put(md);
 270         return ret;
 271 }
 272
 273 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 274                               const char *buf, size_t count)
 275 {
 276         int ret;
 277         char *end;
 278         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 279         unsigned long set = simple_strtoul(buf, &end, 0);
 280         if (end == buf) {
 281                 ret = -EINVAL;
 282                 goto out;
 283         }
 284
 285         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 286         ret = count;
 287 out:
 288         mmc_blk_put(md);
 289         return ret;
 290 }
 291
 292 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 293 {
 294         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 295         int ret = -ENXIO;
 296
 297         mutex_lock(&block_mutex);
 298         if (md) {
 299                 if (md->usage == 2)
 300                         check_disk_change(bdev);
 301                 ret = 0;
 302
 303                 if ((mode & FMODE_WRITE) && md->read_only) {
 304                         mmc_blk_put(md);
 305                         ret = -EROFS;
 306                 }
 307         }
 308         mutex_unlock(&block_mutex);
 309
 310         return ret;
 311 }
 312
 313 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 314 {
 315         struct mmc_blk_data *md = disk->private_data;
 316
 317         mutex_lock(&block_mutex);
 318         mmc_blk_put(md);
 319         mutex_unlock(&block_mutex);
 320 }
 321
 322 static int
 323 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 324 {
 325         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 326         geo->heads = 4;
 327         geo->sectors = 16;
 328         return 0;
 329 }
 330
 331 struct mmc_blk_ioc_data {
 332         struct mmc_ioc_cmd ic;
 333         unsigned char *buf;
 334         u64 buf_bytes;
 335 };
 336
 337 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 338         struct mmc_ioc_cmd __user *user)
 339 {
 340         struct mmc_blk_ioc_data *idata;
 341         int err;
 342
 343         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 344         if (!idata) {
 345                 err = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 350                 err = -EFAULT;
 351                 goto idata_err;
 352         }
 353
 354         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 355         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 356                 err = -EOVERFLOW;
 357                 goto idata_err;
 358         }
 359
 360         if (!idata->buf_bytes)
 361                 return idata;
 362
 363         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 364         if (!idata->buf) {
 365                 err = -ENOMEM;
 366                 goto idata_err;
 367         }
 368
 369         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 370                                         idata->ic.data_ptr, idata->buf_bytes)) {
 371                 err = -EFAULT;
 372                 goto copy_err;
 373         }
 374
 375         return idata;
 376
 377 copy_err:
 378         kfree(idata->buf);
 379 idata_err:
 380         kfree(idata);
 381 out:
 382         return ERR_PTR(err);
 383 }
 384
 385 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 386                                        u32 retries_max)
 387 {
 388         int err;
 389         u32 retry_count = 0;
 390
 391         if (!status || !retries_max)
 392                 return -EINVAL;
 393
 394         do {
 395                 err = get_card_status(card, status, 5);
 396                 if (err)
 397                         break;
 398
 399                 if (!R1_STATUS(*status) &&
 400                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 401                         break; /* RPMB programming operation complete */
 402
 403                 /*
 404                  * Rechedule to give the MMC device a chance to continue
 405                  * processing the previous command without being polled too
 406                  * frequently.
 407                  */
 408                 usleep_range(1000, 5000);
 409         } while (++retry_count < retries_max);
 410
 411         if (retry_count == retries_max)
 412                 err = -EPERM;
 413
 414         return err;
 415 }
 416
 417 static int ioctl_do_sanitize(struct mmc_card *card)
 418 {
 419         int err;
 420
 421         if (!mmc_can_sanitize(card)) {
 422                         pr_warn("%s: %s - SANITIZE is not supported\n",
 423                                 mmc_hostname(card->host), __func__);
 424                         err = -EOPNOTSUPP;
 425                         goto out;
 426         }
 427
 428         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 429                 mmc_hostname(card->host), __func__);
 430
 431         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 432                                         EXT_CSD_SANITIZE_START, 1,
 433                                         MMC_SANITIZE_REQ_TIMEOUT);
 434
 435         if (err)
 436                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 437                        mmc_hostname(card->host), __func__, err);
 438
 439         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 440                                              __func__);
 441 out:
 442         return err;
 443 }
 444
 445 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 446         struct mmc_ioc_cmd __user *ic_ptr)
 447 {
 448         struct mmc_blk_ioc_data *idata;
 449         struct mmc_blk_data *md;
 450         struct mmc_card *card;
 451         struct mmc_command cmd = {0};
 452         struct mmc_data data = {0};
 453         struct mmc_request mrq = {NULL};
 454         struct scatterlist sg;
 455         int err;
 456         int is_rpmb = false;
 457         u32 status = 0;
 458
 459         /*
 460          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 461          * whole block device, not on a partition.  This prevents overspray
 462          * between sibling partitions.
 463          */
 464         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 465                 return -EPERM;
 466
 467         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 468         if (IS_ERR(idata))
 469                 return PTR_ERR(idata);
 470
 471         md = mmc_blk_get(bdev->bd_disk);
 472         if (!md) {
 473                 err = -EINVAL;
 474                 goto cmd_err;
 475         }
 476
 477         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 478                 is_rpmb = true;
 479
 480         card = md->queue.card;
 481         if (IS_ERR(card)) {
 482                 err = PTR_ERR(card);
 483                 goto cmd_done;
 484         }
 485
 486         cmd.opcode = idata->ic.opcode;
 487         cmd.arg = idata->ic.arg;
 488         cmd.flags = idata->ic.flags;
 489
 490         if (idata->buf_bytes) {
 491                 data.sg = &sg;
 492                 data.sg_len = 1;
 493                 data.blksz = idata->ic.blksz;
 494                 data.blocks = idata->ic.blocks;
 495
 496                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 497
 498                 if (idata->ic.write_flag)
 499                         data.flags = MMC_DATA_WRITE;
 500                 else
 501                         data.flags = MMC_DATA_READ;
 502
 503                 /* data.flags must already be set before doing this. */
 504                 mmc_set_data_timeout(&data, card);
 505
 506                 /* Allow overriding the timeout_ns for empirical tuning. */
 507                 if (idata->ic.data_timeout_ns)
 508                         data.timeout_ns = idata->ic.data_timeout_ns;
 509
 510                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 511                         /*
 512                          * Pretend this is a data transfer and rely on the
 513                          * host driver to compute timeout.  When all host
 514                          * drivers support cmd.cmd_timeout for R1B, this
 515                          * can be changed to:
 516                          *
 517                          *     mrq.data = NULL;
 518                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 519                          */
 520                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 521                 }
 522
 523                 mrq.data = &data;
 524         }
 525
 526         mrq.cmd = &cmd;
 527
 528         mmc_get_card(card);
 529
 530         err = mmc_blk_part_switch(card, md);
 531         if (err)
 532                 goto cmd_rel_host;
 533
 534         if (idata->ic.is_acmd) {
 535                 err = mmc_app_cmd(card->host, card);
 536                 if (err)
 537                         goto cmd_rel_host;
 538         }
 539
 540         if (is_rpmb) {
 541                 err = mmc_set_blockcount(card, data.blocks,
 542                         idata->ic.write_flag & (1 << 31));
 543                 if (err)
 544                         goto cmd_rel_host;
 545         }
 546
 547         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 548             (cmd.opcode == MMC_SWITCH)) {
 549                 err = ioctl_do_sanitize(card);
 550
 551                 if (err)
 552                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 553                                __func__, err);
 554
 555                 goto cmd_rel_host;
 556         }
 557
 558         mmc_wait_for_req(card->host, &mrq);
 559
 560         if (cmd.error) {
 561                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 562                                                 __func__, cmd.error);
 563                 err = cmd.error;
 564                 goto cmd_rel_host;
 565         }
 566         if (data.error) {
 567                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 568                                                 __func__, data.error);
 569                 err = data.error;
 570                 goto cmd_rel_host;
 571         }
 572
 573         /*
 574          * According to the SD specs, some commands require a delay after
 575          * issuing the command.
 576          */
 577         if (idata->ic.postsleep_min_us)
 578                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 579
 580         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 581                 err = -EFAULT;
 582                 goto cmd_rel_host;
 583         }
 584
 585         if (!idata->ic.write_flag) {
 586                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 587                                                 idata->buf, idata->buf_bytes)) {
 588                         err = -EFAULT;
 589                         goto cmd_rel_host;
 590                 }
 591         }
 592
 593         if (is_rpmb) {
 594                 /*
 595                  * Ensure RPMB command has completed by polling CMD13
 596                  * "Send Status".
 597                  */
 598                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 599                 if (err)
 600                         dev_err(mmc_dev(card->host),
 601                                         "%s: Card Status=0x%08X, error %d\n",
 602                                         __func__, status, err);
 603         }
 604
 605 cmd_rel_host:
 606         mmc_put_card(card);
 607
 608 cmd_done:
 609         mmc_blk_put(md);
 610 cmd_err:
 611         kfree(idata->buf);
 612         kfree(idata);
 613         return err;
 614 }
 615
 616 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 617         unsigned int cmd, unsigned long arg)
 618 {
 619         int ret = -EINVAL;
 620         if (cmd == MMC_IOC_CMD)
 621                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 622         return ret;
 623 }
 624
 625 #ifdef CONFIG_COMPAT
 626 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 627         unsigned int cmd, unsigned long arg)
 628 {
 629         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 630 }
 631 #endif
 632
 633 static const struct block_device_operations mmc_bdops = {
 634         .open                   = mmc_blk_open,
 635         .release                = mmc_blk_release,
 636         .getgeo                 = mmc_blk_getgeo,
 637         .owner                  = THIS_MODULE,
 638         .ioctl                  = mmc_blk_ioctl,
 639 #ifdef CONFIG_COMPAT
 640         .compat_ioctl           = mmc_blk_compat_ioctl,
 641 #endif
 642 };
 643
 644 static inline int mmc_blk_part_switch(struct mmc_card *card,
 645                                       struct mmc_blk_data *md)
 646 {
 647         int ret;
 648         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 649
 650         if (main_md->part_curr == md->part_type)
 651                 return 0;
 652
 653         if (mmc_card_mmc(card)) {
 654                 u8 part_config = card->ext_csd.part_config;
 655
 656                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 657                 part_config |= md->part_type;
 658
 659                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 660                                  EXT_CSD_PART_CONFIG, part_config,
 661                                  card->ext_csd.part_time);
 662                 if (ret)
 663                         return ret;
 664
 665                 card->ext_csd.part_config = part_config;
 666         }
 667
 668         main_md->part_curr = md->part_type;
 669         return 0;
 670 }
 671
 672 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 673 {
 674         int err;
 675         u32 result;
 676         __be32 *blocks;
 677
 678         struct mmc_request mrq = {NULL};
 679         struct mmc_command cmd = {0};
 680         struct mmc_data data = {0};
 681
 682         struct scatterlist sg;
 683
 684         cmd.opcode = MMC_APP_CMD;
 685         cmd.arg = card->rca << 16;
 686         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 687
 688         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 689         if (err)
 690                 return (u32)-1;
 691         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 692                 return (u32)-1;
 693
 694         memset(&cmd, 0, sizeof(struct mmc_command));
 695
 696         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 697         cmd.arg = 0;
 698         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 699
 700         data.blksz = 4;
 701         data.blocks = 1;
 702         data.flags = MMC_DATA_READ;
 703         data.sg = &sg;
 704         data.sg_len = 1;
 705         mmc_set_data_timeout(&data, card);
 706
 707         mrq.cmd = &cmd;
 708         mrq.data = &data;
 709
 710         blocks = kmalloc(4, GFP_KERNEL);
 711         if (!blocks)
 712                 return (u32)-1;
 713
 714         sg_init_one(&sg, blocks, 4);
 715
 716         mmc_wait_for_req(card->host, &mrq);
 717
 718         result = ntohl(*blocks);
 719         kfree(blocks);
 720
 721         if (cmd.error || data.error)
 722                 result = (u32)-1;
 723
 724         return result;
 725 }
 726
 727 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 728 {
 729         struct mmc_command cmd = {0};
 730         int err;
 731
 732         cmd.opcode = MMC_SEND_STATUS;
 733         if (!mmc_host_is_spi(card->host))
 734                 cmd.arg = card->rca << 16;
 735         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 736         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 737         if (err == 0)
 738                 *status = cmd.resp[0];
 739         return err;
 740 }
 741
 742 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 743                 bool hw_busy_detect, struct request *req, int *gen_err)
 744 {
 745         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 746         int err = 0;
 747         u32 status;
 748
 749         do {
 750                 err = get_card_status(card, &status, 5);
 751                 if (err) {
 752                         pr_err("%s: error %d requesting status\n",
 753                                req->rq_disk->disk_name, err);
 754                         return err;
 755                 }
 756
 757                 if (status & R1_ERROR) {
 758                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 759                                 req->rq_disk->disk_name, __func__, status);
 760                         *gen_err = 1;
 761                 }
 762
 763                 /* We may rely on the host hw to handle busy detection.*/
 764                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 765                         hw_busy_detect)
 766                         break;
 767
 768                 /*
 769                  * Timeout if the device never becomes ready for data and never
 770                  * leaves the program state.
 771                  */
 772                 if (time_after(jiffies, timeout)) {
 773                         pr_err("%s: Card stuck in programming state! %s %s\n",
 774                                 mmc_hostname(card->host),
 775                                 req->rq_disk->disk_name, __func__);
 776                         return -ETIMEDOUT;
 777                 }
 778
 779                 /*
 780                  * Some cards mishandle the status bits,
 781                  * so make sure to check both the busy
 782                  * indication and the card state.
 783                  */
 784         } while (!(status & R1_READY_FOR_DATA) ||
 785                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 786
 787         return err;
 788 }
 789
 790 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 791                 struct request *req, int *gen_err, u32 *stop_status)
 792 {
 793         struct mmc_host *host = card->host;
 794         struct mmc_command cmd = {0};
 795         int err;
 796         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 797
 798         /*
 799          * Normally we use R1B responses for WRITE, but in cases where the host
 800          * has specified a max_busy_timeout we need to validate it. A failure
 801          * means we need to prevent the host from doing hw busy detection, which
 802          * is done by converting to a R1 response instead.
 803          */
 804         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 805                 use_r1b_resp = false;
 806
 807         cmd.opcode = MMC_STOP_TRANSMISSION;
 808         if (use_r1b_resp) {
 809                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 810                 cmd.busy_timeout = timeout_ms;
 811         } else {
 812                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 813         }
 814
 815         err = mmc_wait_for_cmd(host, &cmd, 5);
 816         if (err)
 817                 return err;
 818
 819         *stop_status = cmd.resp[0];
 820
 821         /* No need to check card status in case of READ. */
 822         if (rq_data_dir(req) == READ)
 823                 return 0;
 824
 825         if (!mmc_host_is_spi(host) &&
 826                 (*stop_status & R1_ERROR)) {
 827                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 828                         req->rq_disk->disk_name, __func__, *stop_status);
 829                 *gen_err = 1;
 830         }
 831
 832         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 833 }
 834
 835 #define ERR_NOMEDIUM    3
 836 #define ERR_RETRY       2
 837 #define ERR_ABORT       1
 838 #define ERR_CONTINUE    0
 839
 840 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 841         bool status_valid, u32 status)
 842 {
 843         switch (error) {
 844         case -EILSEQ:
 845                 /* response crc error, retry the r/w cmd */
 846                 pr_err("%s: %s sending %s command, card status %#x\n",
 847                         req->rq_disk->disk_name, "response CRC error",
 848                         name, status);
 849                 return ERR_RETRY;
 850
 851         case -ETIMEDOUT:
 852                 pr_err("%s: %s sending %s command, card status %#x\n",
 853                         req->rq_disk->disk_name, "timed out", name, status);
 854
 855                 /* If the status cmd initially failed, retry the r/w cmd */
 856                 if (!status_valid)
 857                         return ERR_RETRY;
 858
 859                 /*
 860                  * If it was a r/w cmd crc error, or illegal command
 861                  * (eg, issued in wrong state) then retry - we should
 862                  * have corrected the state problem above.
 863                  */
 864                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 865                         return ERR_RETRY;
 866
 867                 /* Otherwise abort the command */
 868                 return ERR_ABORT;
 869
 870         default:
 871                 /* We don't understand the error code the driver gave us */
 872                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 873                        req->rq_disk->disk_name, error, status);
 874                 return ERR_ABORT;
 875         }
 876 }
 877
 878 /*
 879  * Initial r/w and stop cmd error recovery.
 880  * We don't know whether the card received the r/w cmd or not, so try to
 881  * restore things back to a sane state.  Essentially, we do this as follows:
 882  * - Obtain card status.  If the first attempt to obtain card status fails,
 883  *   the status word will reflect the failed status cmd, not the failed
 884  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 885  *   longer communicate with the card.
 886  * - Check the card state.  If the card received the cmd but there was a
 887  *   transient problem with the response, it might still be in a data transfer
 888  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 889  * - If the r/w cmd failed due to a response CRC error, it was probably
 890  *   transient, so retry the cmd.
 891  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 892  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 893  *   illegal cmd, retry.
 894  * Otherwise we don't understand what happened, so abort.
 895  */
 896 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 897         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 898 {
 899         bool prev_cmd_status_valid = true;
 900         u32 status, stop_status = 0;
 901         int err, retry;
 902
 903         if (mmc_card_removed(card))
 904                 return ERR_NOMEDIUM;
 905
 906         /*
 907          * Try to get card status which indicates both the card state
 908          * and why there was no response.  If the first attempt fails,
 909          * we can't be sure the returned status is for the r/w command.
 910          */
 911         for (retry = 2; retry >= 0; retry--) {
 912                 err = get_card_status(card, &status, 0);
 913                 if (!err)
 914                         break;
 915
 916                 prev_cmd_status_valid = false;
 917                 pr_err("%s: error %d sending status command, %sing\n",
 918                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 919         }
 920
 921         /* We couldn't get a response from the card.  Give up. */
 922         if (err) {
 923                 /* Check if the card is removed */
 924                 if (mmc_detect_card_removed(card->host))
 925                         return ERR_NOMEDIUM;
 926                 return ERR_ABORT;
 927         }
 928
 929         /* Flag ECC errors */
 930         if ((status & R1_CARD_ECC_FAILED) ||
 931             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 932             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 933                 *ecc_err = 1;
 934
 935         /* Flag General errors */
 936         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 937                 if ((status & R1_ERROR) ||
 938                         (brq->stop.resp[0] & R1_ERROR)) {
 939                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 940                                req->rq_disk->disk_name, __func__,
 941                                brq->stop.resp[0], status);
 942                         *gen_err = 1;
 943                 }
 944
 945         /*
 946          * Check the current card state.  If it is in some data transfer
 947          * mode, tell it to stop (and hopefully transition back to TRAN.)
 948          */
 949         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 950             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 951                 err = send_stop(card,
 952                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
 953                         req, gen_err, &stop_status);
 954                 if (err) {
 955                         pr_err("%s: error %d sending stop command\n",
 956                                req->rq_disk->disk_name, err);
 957                         /*
 958                          * If the stop cmd also timed out, the card is probably
 959                          * not present, so abort. Other errors are bad news too.
 960                          */
 961                         return ERR_ABORT;
 962                 }
 963
 964                 if (stop_status & R1_CARD_ECC_FAILED)
 965                         *ecc_err = 1;
 966         }
 967
 968         /* Check for set block count errors */
 969         if (brq->sbc.error)
 970                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 971                                 prev_cmd_status_valid, status);
 972
 973         /* Check for r/w command errors */
 974         if (brq->cmd.error)
 975                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 976                                 prev_cmd_status_valid, status);
 977
 978         /* Data errors */
 979         if (!brq->stop.error)
 980                 return ERR_CONTINUE;
 981
 982         /* Now for stop errors.  These aren't fatal to the transfer. */
 983         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 984                req->rq_disk->disk_name, brq->stop.error,
 985                brq->cmd.resp[0], status);
 986
 987         /*
 988          * Subsitute in our own stop status as this will give the error
 989          * state which happened during the execution of the r/w command.
 990          */
 991         if (stop_status) {
 992                 brq->stop.resp[0] = stop_status;
 993                 brq->stop.error = 0;
 994         }
 995         return ERR_CONTINUE;
 996 }
 997
 998 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 999                          int type)
1000 {
1001         int err;
1002
1003         if (md->reset_done & type)
1004                 return -EEXIST;
1005
1006         md->reset_done |= type;
1007         err = mmc_hw_reset(host);
1008         /* Ensure we switch back to the correct partition */
1009         if (err != -EOPNOTSUPP) {
1010                 struct mmc_blk_data *main_md =
1011                         dev_get_drvdata(&host->card->dev);
1012                 int part_err;
1013
1014                 main_md->part_curr = main_md->part_type;
1015                 part_err = mmc_blk_part_switch(host->card, md);
1016                 if (part_err) {
1017                         /*
1018                          * We have failed to get back into the correct
1019                          * partition, so we need to abort the whole request.
1020                          */
1021                         return -ENODEV;
1022                 }
1023         }
1024         return err;
1025 }
1026
1027 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1028 {
1029         md->reset_done &= ~type;
1030 }
1031
1032 int mmc_access_rpmb(struct mmc_queue *mq)
1033 {
1034         struct mmc_blk_data *md = mq->data;
1035         /*
1036          * If this is a RPMB partition access, return ture
1037          */
1038         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1039                 return true;
1040
1041         return false;
1042 }
1043 EXPORT_SYMBOL_GPL(mmc_access_rpmb);
1044
1045 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1046 {
1047         struct mmc_blk_data *md = mq->data;
1048         struct mmc_card *card = md->queue.card;
1049         unsigned int from, nr, arg;
1050         int err = 0, type = MMC_BLK_DISCARD;
1051
1052         if (!mmc_can_erase(card)) {
1053                 err = -EOPNOTSUPP;
1054                 goto out;
1055         }
1056
1057         from = blk_rq_pos(req);
1058         nr = blk_rq_sectors(req);
1059
1060         if (mmc_can_discard(card))
1061                 arg = MMC_DISCARD_ARG;
1062         else if (mmc_can_trim(card))
1063                 arg = MMC_TRIM_ARG;
1064         else
1065                 arg = MMC_ERASE_ARG;
1066 retry:
1067         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1068                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1069                                  INAND_CMD38_ARG_EXT_CSD,
1070                                  arg == MMC_TRIM_ARG ?
1071                                  INAND_CMD38_ARG_TRIM :
1072                                  INAND_CMD38_ARG_ERASE,
1073                                  0);
1074                 if (err)
1075                         goto out;
1076         }
1077         err = mmc_erase(card, from, nr, arg);
1078 out:
1079         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1080                 goto retry;
1081         if (!err)
1082                 mmc_blk_reset_success(md, type);
1083         blk_end_request(req, err, blk_rq_bytes(req));
1084
1085         return err ? 0 : 1;
1086 }
1087
1088 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1089                                        struct request *req)
1090 {
1091         struct mmc_blk_data *md = mq->data;
1092         struct mmc_card *card = md->queue.card;
1093         unsigned int from, nr, arg;
1094         int err = 0, type = MMC_BLK_SECDISCARD;
1095
1096         if (!(mmc_can_secure_erase_trim(card))) {
1097                 err = -EOPNOTSUPP;
1098                 goto out;
1099         }
1100
1101         from = blk_rq_pos(req);
1102         nr = blk_rq_sectors(req);
1103
1104         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1105                 arg = MMC_SECURE_TRIM1_ARG;
1106         else
1107                 arg = MMC_SECURE_ERASE_ARG;
1108
1109 retry:
1110         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1111                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1112                                  INAND_CMD38_ARG_EXT_CSD,
1113                                  arg == MMC_SECURE_TRIM1_ARG ?
1114                                  INAND_CMD38_ARG_SECTRIM1 :
1115                                  INAND_CMD38_ARG_SECERASE,
1116                                  0);
1117                 if (err)
1118                         goto out_retry;
1119         }
1120
1121         err = mmc_erase(card, from, nr, arg);
1122         if (err == -EIO)
1123                 goto out_retry;
1124         if (err)
1125                 goto out;
1126
1127         if (arg == MMC_SECURE_TRIM1_ARG) {
1128                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1129                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1130                                          INAND_CMD38_ARG_EXT_CSD,
1131                                          INAND_CMD38_ARG_SECTRIM2,
1132                                          0);
1133                         if (err)
1134                                 goto out_retry;
1135                 }
1136
1137                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1138                 if (err == -EIO)
1139                         goto out_retry;
1140                 if (err)
1141                         goto out;
1142         }
1143
1144 out_retry:
1145         if (err && !mmc_blk_reset(md, card->host, type))
1146                 goto retry;
1147         if (!err)
1148                 mmc_blk_reset_success(md, type);
1149 out:
1150         blk_end_request(req, err, blk_rq_bytes(req));
1151
1152         return err ? 0 : 1;
1153 }
1154
1155 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1156 {
1157         struct mmc_blk_data *md = mq->data;
1158         struct mmc_card *card = md->queue.card;
1159         int ret = 0;
1160
1161         ret = mmc_flush_cache(card);
1162         if (ret)
1163                 ret = -EIO;
1164
1165         blk_end_request_all(req, ret);
1166
1167         return ret ? 0 : 1;
1168 }
1169
1170 /*
1171  * Reformat current write as a reliable write, supporting
1172  * both legacy and the enhanced reliable write MMC cards.
1173  * In each transfer we'll handle only as much as a single
1174  * reliable write can handle, thus finish the request in
1175  * partial completions.
1176  */
1177 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1178                                     struct mmc_card *card,
1179                                     struct request *req)
1180 {
1181         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1182                 /* Legacy mode imposes restrictions on transfers. */
1183                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1184                         brq->data.blocks = 1;
1185
1186                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1187                         brq->data.blocks = card->ext_csd.rel_sectors;
1188                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1189                         brq->data.blocks = 1;
1190         }
1191 }
1192
1193 #define CMD_ERRORS                                                      \
1194         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1195          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1196          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1197          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1198          R1_CC_ERROR |          /* Card controller error */             \
1199          R1_ERROR)              /* General/unknown error */
1200
1201 static int mmc_blk_err_check(struct mmc_card *card,
1202                              struct mmc_async_req *areq)
1203 {
1204         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1205                                                     mmc_active);
1206         struct mmc_blk_request *brq = &mq_mrq->brq;
1207         struct request *req = mq_mrq->req;
1208         int ecc_err = 0, gen_err = 0;
1209
1210         /*
1211          * sbc.error indicates a problem with the set block count
1212          * command.  No data will have been transferred.
1213          *
1214          * cmd.error indicates a problem with the r/w command.  No
1215          * data will have been transferred.
1216          *
1217          * stop.error indicates a problem with the stop command.  Data
1218          * may have been transferred, or may still be transferring.
1219          */
1220         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1221             brq->data.error) {
1222                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1223                 case ERR_RETRY:
1224                         return MMC_BLK_RETRY;
1225                 case ERR_ABORT:
1226                         return MMC_BLK_ABORT;
1227                 case ERR_NOMEDIUM:
1228                         return MMC_BLK_NOMEDIUM;
1229                 case ERR_CONTINUE:
1230                         break;
1231                 }
1232         }
1233
1234         /*
1235          * Check for errors relating to the execution of the
1236          * initial command - such as address errors.  No data
1237          * has been transferred.
1238          */
1239         if (brq->cmd.resp[0] & CMD_ERRORS) {
1240                 pr_err("%s: r/w command failed, status = %#x\n",
1241                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1242                 return MMC_BLK_ABORT;
1243         }
1244
1245         /*
1246          * Everything else is either success, or a data error of some
1247          * kind.  If it was a write, we may have transitioned to
1248          * program mode, which we have to wait for it to complete.
1249          */
1250         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1251                 int err;
1252
1253                 /* Check stop command response */
1254                 if (brq->stop.resp[0] & R1_ERROR) {
1255                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1256                                req->rq_disk->disk_name, __func__,
1257                                brq->stop.resp[0]);
1258                         gen_err = 1;
1259                 }
1260
1261                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1262                                         &gen_err);
1263                 if (err)
1264                         return MMC_BLK_CMD_ERR;
1265         }
1266
1267         /* if general error occurs, retry the write operation. */
1268         if (gen_err) {
1269                 pr_warn("%s: retrying write for general error\n",
1270                                 req->rq_disk->disk_name);
1271                 return MMC_BLK_RETRY;
1272         }
1273
1274         if (brq->data.error) {
1275                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1276                        req->rq_disk->disk_name, brq->data.error,
1277                        (unsigned)blk_rq_pos(req),
1278                        (unsigned)blk_rq_sectors(req),
1279                        brq->cmd.resp[0], brq->stop.resp[0]);
1280
1281                 if (rq_data_dir(req) == READ) {
1282                         if (ecc_err)
1283                                 return MMC_BLK_ECC_ERR;
1284                         return MMC_BLK_DATA_ERR;
1285                 } else {
1286                         return MMC_BLK_CMD_ERR;
1287                 }
1288         }
1289
1290         if (!brq->data.bytes_xfered)
1291                 return MMC_BLK_RETRY;
1292
1293         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1294                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1295                         return MMC_BLK_PARTIAL;
1296                 else
1297                         return MMC_BLK_SUCCESS;
1298         }
1299
1300         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1301                 return MMC_BLK_PARTIAL;
1302
1303         return MMC_BLK_SUCCESS;
1304 }
1305
1306 static int mmc_blk_packed_err_check(struct mmc_card *card,
1307                                     struct mmc_async_req *areq)
1308 {
1309         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1310                         mmc_active);
1311         struct request *req = mq_rq->req;
1312         struct mmc_packed *packed = mq_rq->packed;
1313         int err, check, status;
1314         u8 *ext_csd;
1315
1316         BUG_ON(!packed);
1317
1318         packed->retries--;
1319         check = mmc_blk_err_check(card, areq);
1320         err = get_card_status(card, &status, 0);
1321         if (err) {
1322                 pr_err("%s: error %d sending status command\n",
1323                        req->rq_disk->disk_name, err);
1324                 return MMC_BLK_ABORT;
1325         }
1326
1327         if (status & R1_EXCEPTION_EVENT) {
1328                 err = mmc_get_ext_csd(card, &ext_csd);
1329                 if (err) {
1330                         pr_err("%s: error %d sending ext_csd\n",
1331                                req->rq_disk->disk_name, err);
1332                         return MMC_BLK_ABORT;
1333                 }
1334
1335                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1336                      EXT_CSD_PACKED_FAILURE) &&
1337                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1338                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1339                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1340                             EXT_CSD_PACKED_INDEXED_ERROR) {
1341                                 packed->idx_failure =
1342                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1343                                 check = MMC_BLK_PARTIAL;
1344                         }
1345                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1346                                "failure index: %d\n",
1347                                req->rq_disk->disk_name, packed->nr_entries,
1348                                packed->blocks, packed->idx_failure);
1349                 }
1350                 kfree(ext_csd);
1351         }
1352
1353         return check;
1354 }
1355
1356 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1357                                struct mmc_card *card,
1358                                int disable_multi,
1359                                struct mmc_queue *mq)
1360 {
1361         u32 readcmd, writecmd;
1362         struct mmc_blk_request *brq = &mqrq->brq;
1363         struct request *req = mqrq->req;
1364         struct mmc_blk_data *md = mq->data;
1365         bool do_data_tag;
1366
1367         /*
1368          * Reliable writes are used to implement Forced Unit Access and
1369          * REQ_META accesses, and are supported only on MMCs.
1370          *
1371          * XXX: this really needs a good explanation of why REQ_META
1372          * is treated special.
1373          */
1374         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1375                           (req->cmd_flags & REQ_META)) &&
1376                 (rq_data_dir(req) == WRITE) &&
1377                 (md->flags & MMC_BLK_REL_WR);
1378
1379         memset(brq, 0, sizeof(struct mmc_blk_request));
1380         brq->mrq.cmd = &brq->cmd;
1381         brq->mrq.data = &brq->data;
1382
1383         brq->cmd.arg = blk_rq_pos(req);
1384         if (!mmc_card_blockaddr(card))
1385                 brq->cmd.arg <<= 9;
1386         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1387         brq->data.blksz = 512;
1388         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1389         brq->stop.arg = 0;
1390         brq->data.blocks = blk_rq_sectors(req);
1391
1392         /*
1393          * The block layer doesn't support all sector count
1394          * restrictions, so we need to be prepared for too big
1395          * requests.
1396          */
1397         if (brq->data.blocks > card->host->max_blk_count)
1398                 brq->data.blocks = card->host->max_blk_count;
1399
1400         if (brq->data.blocks > 1) {
1401                 /*
1402                  * After a read error, we redo the request one sector
1403                  * at a time in order to accurately determine which
1404                  * sectors can be read successfully.
1405                  */
1406                 if (disable_multi)
1407                         brq->data.blocks = 1;
1408
1409                 /*
1410                  * Some controllers have HW issues while operating
1411                  * in multiple I/O mode
1412                  */
1413                 if (card->host->ops->multi_io_quirk)
1414                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1415                                                 (rq_data_dir(req) == READ) ?
1416                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1417                                                 brq->data.blocks);
1418         }
1419
1420         if (brq->data.blocks > 1 || do_rel_wr) {
1421                 /* SPI multiblock writes terminate using a special
1422                  * token, not a STOP_TRANSMISSION request.
1423                  */
1424                 if (!mmc_host_is_spi(card->host) ||
1425                     rq_data_dir(req) == READ)
1426                         brq->mrq.stop = &brq->stop;
1427                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1428                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1429         } else {
1430                 brq->mrq.stop = NULL;
1431                 readcmd = MMC_READ_SINGLE_BLOCK;
1432                 writecmd = MMC_WRITE_BLOCK;
1433         }
1434         if (rq_data_dir(req) == READ) {
1435                 brq->cmd.opcode = readcmd;
1436                 brq->data.flags |= MMC_DATA_READ;
1437                 if (brq->mrq.stop)
1438                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1439                                         MMC_CMD_AC;
1440         } else {
1441                 brq->cmd.opcode = writecmd;
1442                 brq->data.flags |= MMC_DATA_WRITE;
1443                 if (brq->mrq.stop)
1444                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1445                                         MMC_CMD_AC;
1446         }
1447
1448         if (do_rel_wr)
1449                 mmc_apply_rel_rw(brq, card, req);
1450
1451         /*
1452          * Data tag is used only during writing meta data to speed
1453          * up write and any subsequent read of this meta data
1454          */
1455         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1456                 (req->cmd_flags & REQ_META) &&
1457                 (rq_data_dir(req) == WRITE) &&
1458                 ((brq->data.blocks * brq->data.blksz) >=
1459                  card->ext_csd.data_tag_unit_size);
1460
1461         /*
1462          * Pre-defined multi-block transfers are preferable to
1463          * open ended-ones (and necessary for reliable writes).
1464          * However, it is not sufficient to just send CMD23,
1465          * and avoid the final CMD12, as on an error condition
1466          * CMD12 (stop) needs to be sent anyway. This, coupled
1467          * with Auto-CMD23 enhancements provided by some
1468          * hosts, means that the complexity of dealing
1469          * with this is best left to the host. If CMD23 is
1470          * supported by card and host, we'll fill sbc in and let
1471          * the host deal with handling it correctly. This means
1472          * that for hosts that don't expose MMC_CAP_CMD23, no
1473          * change of behavior will be observed.
1474          *
1475          * N.B: Some MMC cards experience perf degradation.
1476          * We'll avoid using CMD23-bounded multiblock writes for
1477          * these, while retaining features like reliable writes.
1478          */
1479         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1480             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1481              do_data_tag)) {
1482                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1483                 brq->sbc.arg = brq->data.blocks |
1484                         (do_rel_wr ? (1 << 31) : 0) |
1485                         (do_data_tag ? (1 << 29) : 0);
1486                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1487                 brq->mrq.sbc = &brq->sbc;
1488         }
1489
1490         mmc_set_data_timeout(&brq->data, card);
1491
1492         brq->data.sg = mqrq->sg;
1493         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1494
1495         /*
1496          * Adjust the sg list so it is the same size as the
1497          * request.
1498          */
1499         if (brq->data.blocks != blk_rq_sectors(req)) {
1500                 int i, data_size = brq->data.blocks << 9;
1501                 struct scatterlist *sg;
1502
1503                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1504                         data_size -= sg->length;
1505                         if (data_size <= 0) {
1506                                 sg->length += data_size;
1507                                 i++;
1508                                 break;
1509                         }
1510                 }
1511                 brq->data.sg_len = i;
1512         }
1513
1514         mqrq->mmc_active.mrq = &brq->mrq;
1515         mqrq->mmc_active.err_check = mmc_blk_err_check;
1516
1517         mmc_queue_bounce_pre(mqrq);
1518 }
1519
1520 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1521                                           struct mmc_card *card)
1522 {
1523         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1524         unsigned int max_seg_sz = queue_max_segment_size(q);
1525         unsigned int len, nr_segs = 0;
1526
1527         do {
1528                 len = min(hdr_sz, max_seg_sz);
1529                 hdr_sz -= len;
1530                 nr_segs++;
1531         } while (hdr_sz);
1532
1533         return nr_segs;
1534 }
1535
1536 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1537 {
1538         struct request_queue *q = mq->queue;
1539         struct mmc_card *card = mq->card;
1540         struct request *cur = req, *next = NULL;
1541         struct mmc_blk_data *md = mq->data;
1542         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1543         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1544         unsigned int req_sectors = 0, phys_segments = 0;
1545         unsigned int max_blk_count, max_phys_segs;
1546         bool put_back = true;
1547         u8 max_packed_rw = 0;
1548         u8 reqs = 0;
1549
1550         if (!(md->flags & MMC_BLK_PACKED_CMD))
1551                 goto no_packed;
1552
1553         if ((rq_data_dir(cur) == WRITE) &&
1554             mmc_host_packed_wr(card->host))
1555                 max_packed_rw = card->ext_csd.max_packed_writes;
1556
1557         if (max_packed_rw == 0)
1558                 goto no_packed;
1559
1560         if (mmc_req_rel_wr(cur) &&
1561             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1562                 goto no_packed;
1563
1564         if (mmc_large_sector(card) &&
1565             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1566                 goto no_packed;
1567
1568         mmc_blk_clear_packed(mqrq);
1569
1570         max_blk_count = min(card->host->max_blk_count,
1571                             card->host->max_req_size >> 9);
1572         if (unlikely(max_blk_count > 0xffff))
1573                 max_blk_count = 0xffff;
1574
1575         max_phys_segs = queue_max_segments(q);
1576         req_sectors += blk_rq_sectors(cur);
1577         phys_segments += cur->nr_phys_segments;
1578
1579         if (rq_data_dir(cur) == WRITE) {
1580                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1581                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1582         }
1583
1584         do {
1585                 if (reqs >= max_packed_rw - 1) {
1586                         put_back = false;
1587                         break;
1588                 }
1589
1590                 spin_lock_irq(q->queue_lock);
1591                 next = blk_fetch_request(q);
1592                 spin_unlock_irq(q->queue_lock);
1593                 if (!next) {
1594                         put_back = false;
1595                         break;
1596                 }
1597
1598                 if (mmc_large_sector(card) &&
1599                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1600                         break;
1601
1602                 if (next->cmd_flags & REQ_DISCARD ||
1603                     next->cmd_flags & REQ_FLUSH)
1604                         break;
1605
1606                 if (rq_data_dir(cur) != rq_data_dir(next))
1607                         break;
1608
1609                 if (mmc_req_rel_wr(next) &&
1610                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1611                         break;
1612
1613                 req_sectors += blk_rq_sectors(next);
1614                 if (req_sectors > max_blk_count)
1615                         break;
1616
1617                 phys_segments +=  next->nr_phys_segments;
1618                 if (phys_segments > max_phys_segs)
1619                         break;
1620
1621                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1622                 cur = next;
1623                 reqs++;
1624         } while (1);
1625
1626         if (put_back) {
1627                 spin_lock_irq(q->queue_lock);
1628                 blk_requeue_request(q, next);
1629                 spin_unlock_irq(q->queue_lock);
1630         }
1631
1632         if (reqs > 0) {
1633                 list_add(&req->queuelist, &mqrq->packed->list);
1634                 mqrq->packed->nr_entries = ++reqs;
1635                 mqrq->packed->retries = reqs;
1636                 return reqs;
1637         }
1638
1639 no_packed:
1640         mqrq->cmd_type = MMC_PACKED_NONE;
1641         return 0;
1642 }
1643
1644 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1645                                         struct mmc_card *card,
1646                                         struct mmc_queue *mq)
1647 {
1648         struct mmc_blk_request *brq = &mqrq->brq;
1649         struct request *req = mqrq->req;
1650         struct request *prq;
1651         struct mmc_blk_data *md = mq->data;
1652         struct mmc_packed *packed = mqrq->packed;
1653         bool do_rel_wr, do_data_tag;
1654         u32 *packed_cmd_hdr;
1655         u8 hdr_blocks;
1656         u8 i = 1;
1657
1658         BUG_ON(!packed);
1659
1660         mqrq->cmd_type = MMC_PACKED_WRITE;
1661         packed->blocks = 0;
1662         packed->idx_failure = MMC_PACKED_NR_IDX;
1663
1664         packed_cmd_hdr = packed->cmd_hdr;
1665         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1666         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1667                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1668         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1669
1670         /*
1671          * Argument for each entry of packed group
1672          */
1673         list_for_each_entry(prq, &packed->list, queuelist) {
1674                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1675                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1676                         (prq->cmd_flags & REQ_META) &&
1677                         (rq_data_dir(prq) == WRITE) &&
1678                         ((brq->data.blocks * brq->data.blksz) >=
1679                          card->ext_csd.data_tag_unit_size);
1680                 /* Argument of CMD23 */
1681                 packed_cmd_hdr[(i * 2)] =
1682                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1683                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1684                         blk_rq_sectors(prq);
1685                 /* Argument of CMD18 or CMD25 */
1686                 packed_cmd_hdr[((i * 2)) + 1] =
1687                         mmc_card_blockaddr(card) ?
1688                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1689                 packed->blocks += blk_rq_sectors(prq);
1690                 i++;
1691         }
1692
1693         memset(brq, 0, sizeof(struct mmc_blk_request));
1694         brq->mrq.cmd = &brq->cmd;
1695         brq->mrq.data = &brq->data;
1696         brq->mrq.sbc = &brq->sbc;
1697         brq->mrq.stop = &brq->stop;
1698
1699         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1700         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1701         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1702
1703         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1704         brq->cmd.arg = blk_rq_pos(req);
1705         if (!mmc_card_blockaddr(card))
1706                 brq->cmd.arg <<= 9;
1707         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1708
1709         brq->data.blksz = 512;
1710         brq->data.blocks = packed->blocks + hdr_blocks;
1711         brq->data.flags |= MMC_DATA_WRITE;
1712
1713         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1714         brq->stop.arg = 0;
1715         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1716
1717         mmc_set_data_timeout(&brq->data, card);
1718
1719         brq->data.sg = mqrq->sg;
1720         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1721
1722         mqrq->mmc_active.mrq = &brq->mrq;
1723         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1724
1725         mmc_queue_bounce_pre(mqrq);
1726 }
1727
1728 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1729                            struct mmc_blk_request *brq, struct request *req,
1730                            int ret)
1731 {
1732         struct mmc_queue_req *mq_rq;
1733         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1734
1735         /*
1736          * If this is an SD card and we're writing, we can first
1737          * mark the known good sectors as ok.
1738          *
1739          * If the card is not SD, we can still ok written sectors
1740          * as reported by the controller (which might be less than
1741          * the real number of written sectors, but never more).
1742          */
1743         if (mmc_card_sd(card)) {
1744                 u32 blocks;
1745
1746                 blocks = mmc_sd_num_wr_blocks(card);
1747                 if (blocks != (u32)-1) {
1748                         ret = blk_end_request(req, 0, blocks << 9);
1749                 }
1750         } else {
1751                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1752                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1753         }
1754         return ret;
1755 }
1756
1757 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1758 {
1759         struct request *prq;
1760         struct mmc_packed *packed = mq_rq->packed;
1761         int idx = packed->idx_failure, i = 0;
1762         int ret = 0;
1763
1764         BUG_ON(!packed);
1765
1766         while (!list_empty(&packed->list)) {
1767                 prq = list_entry_rq(packed->list.next);
1768                 if (idx == i) {
1769                         /* retry from error index */
1770                         packed->nr_entries -= idx;
1771                         mq_rq->req = prq;
1772                         ret = 1;
1773
1774                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1775                                 list_del_init(&prq->queuelist);
1776                                 mmc_blk_clear_packed(mq_rq);
1777                         }
1778                         return ret;
1779                 }
1780                 list_del_init(&prq->queuelist);
1781                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1782                 i++;
1783         }
1784
1785         mmc_blk_clear_packed(mq_rq);
1786         return ret;
1787 }
1788
1789 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1790 {
1791         struct request *prq;
1792         struct mmc_packed *packed = mq_rq->packed;
1793
1794         BUG_ON(!packed);
1795
1796         while (!list_empty(&packed->list)) {
1797                 prq = list_entry_rq(packed->list.next);
1798                 list_del_init(&prq->queuelist);
1799                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1800         }
1801
1802         mmc_blk_clear_packed(mq_rq);
1803 }
1804
1805 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1806                                       struct mmc_queue_req *mq_rq)
1807 {
1808         struct request *prq;
1809         struct request_queue *q = mq->queue;
1810         struct mmc_packed *packed = mq_rq->packed;
1811
1812         BUG_ON(!packed);
1813
1814         while (!list_empty(&packed->list)) {
1815                 prq = list_entry_rq(packed->list.prev);
1816                 if (prq->queuelist.prev != &packed->list) {
1817                         list_del_init(&prq->queuelist);
1818                         spin_lock_irq(q->queue_lock);
1819                         blk_requeue_request(mq->queue, prq);
1820                         spin_unlock_irq(q->queue_lock);
1821                 } else {
1822                         list_del_init(&prq->queuelist);
1823                 }
1824         }
1825
1826         mmc_blk_clear_packed(mq_rq);
1827 }
1828
1829 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1830 {
1831         struct mmc_blk_data *md = mq->data;
1832         struct mmc_card *card = md->queue.card;
1833         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1834         int ret = 1, disable_multi = 0, retry = 0, type;
1835         enum mmc_blk_status status;
1836         struct mmc_queue_req *mq_rq;
1837         struct request *req = rqc;
1838         struct mmc_async_req *areq;
1839         const u8 packed_nr = 2;
1840         u8 reqs = 0;
1841
1842         if (!rqc && !mq->mqrq_prev->req)
1843                 return 0;
1844
1845         if (rqc)
1846                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1847
1848         do {
1849                 if (rqc) {
1850                         /*
1851                          * When 4KB native sector is enabled, only 8 blocks
1852                          * multiple read or write is allowed
1853                          */
1854                         if ((brq->data.blocks & 0x07) &&
1855                             (card->ext_csd.data_sector_size == 4096)) {
1856                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1857                                         req->rq_disk->disk_name);
1858                                 mq_rq = mq->mqrq_cur;
1859                                 goto cmd_abort;
1860                         }
1861
1862                         if (reqs >= packed_nr)
1863                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1864                                                             card, mq);
1865                         else
1866                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1867                         areq = &mq->mqrq_cur->mmc_active;
1868                 } else
1869                         areq = NULL;
1870                 areq = mmc_start_req(card->host, areq, (int *) &status);
1871                 if (!areq) {
1872                         if (status == MMC_BLK_NEW_REQUEST)
1873                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1874                         return 0;
1875                 }
1876
1877                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1878                 brq = &mq_rq->brq;
1879                 req = mq_rq->req;
1880                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1881                 mmc_queue_bounce_post(mq_rq);
1882
1883                 switch (status) {
1884                 case MMC_BLK_SUCCESS:
1885                 case MMC_BLK_PARTIAL:
1886                         /*
1887                          * A block was successfully transferred.
1888                          */
1889                         mmc_blk_reset_success(md, type);
1890
1891                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1892                                 ret = mmc_blk_end_packed_req(mq_rq);
1893                                 break;
1894                         } else {
1895                                 ret = blk_end_request(req, 0,
1896                                                 brq->data.bytes_xfered);
1897                         }
1898
1899                         /*
1900                          * If the blk_end_request function returns non-zero even
1901                          * though all data has been transferred and no errors
1902                          * were returned by the host controller, it's a bug.
1903                          */
1904                         if (status == MMC_BLK_SUCCESS && ret) {
1905                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1906                                        __func__, blk_rq_bytes(req),
1907                                        brq->data.bytes_xfered);
1908                                 rqc = NULL;
1909                                 goto cmd_abort;
1910                         }
1911                         break;
1912                 case MMC_BLK_CMD_ERR:
1913                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1914                         if (!mmc_blk_reset(md, card->host, type))
1915                                 break;
1916                         goto cmd_abort;
1917                 case MMC_BLK_RETRY:
1918                         if (retry++ < 5)
1919                                 break;
1920                         /* Fall through */
1921                 case MMC_BLK_ABORT:
1922                         if (!mmc_blk_reset(md, card->host, type))
1923                                 break;
1924                         goto cmd_abort;
1925                 case MMC_BLK_DATA_ERR: {
1926                         int err;
1927
1928                         err = mmc_blk_reset(md, card->host, type);
1929                         if (!err)
1930                                 break;
1931                         if (err == -ENODEV ||
1932                                 mmc_packed_cmd(mq_rq->cmd_type))
1933                                 goto cmd_abort;
1934                         /* Fall through */
1935                 }
1936                 case MMC_BLK_ECC_ERR:
1937                         if (brq->data.blocks > 1) {
1938                                 /* Redo read one sector at a time */
1939                                 pr_warn("%s: retrying using single block read\n",
1940                                         req->rq_disk->disk_name);
1941                                 disable_multi = 1;
1942                                 break;
1943                         }
1944                         /*
1945                          * After an error, we redo I/O one sector at a
1946                          * time, so we only reach here after trying to
1947                          * read a single sector.
1948                          */
1949                         ret = blk_end_request(req, -EIO,
1950                                                 brq->data.blksz);
1951                         if (!ret)
1952                                 goto start_new_req;
1953                         break;
1954                 case MMC_BLK_NOMEDIUM:
1955                         goto cmd_abort;
1956                 default:
1957                         pr_err("%s: Unhandled return value (%d)",
1958                                         req->rq_disk->disk_name, status);
1959                         goto cmd_abort;
1960                 }
1961
1962                 if (ret) {
1963                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1964                                 if (!mq_rq->packed->retries)
1965                                         goto cmd_abort;
1966                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1967                                 mmc_start_req(card->host,
1968                                               &mq_rq->mmc_active, NULL);
1969                         } else {
1970
1971                                 /*
1972                                  * In case of a incomplete request
1973                                  * prepare it again and resend.
1974                                  */
1975                                 mmc_blk_rw_rq_prep(mq_rq, card,
1976                                                 disable_multi, mq);
1977                                 mmc_start_req(card->host,
1978                                                 &mq_rq->mmc_active, NULL);
1979                         }
1980                 }
1981         } while (ret);
1982
1983         return 1;
1984
1985  cmd_abort:
1986         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1987                 mmc_blk_abort_packed_req(mq_rq);
1988         } else {
1989                 if (mmc_card_removed(card))
1990                         req->cmd_flags |= REQ_QUIET;
1991                 while (ret)
1992                         ret = blk_end_request(req, -EIO,
1993                                         blk_rq_cur_bytes(req));
1994         }
1995
1996  start_new_req:
1997         if (rqc) {
1998                 if (mmc_card_removed(card)) {
1999                         rqc->cmd_flags |= REQ_QUIET;
2000                         blk_end_request_all(rqc, -EIO);
2001                 } else {
2002                         /*
2003                          * If current request is packed, it needs to put back.
2004                          */
2005                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2006                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2007
2008                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2009                         mmc_start_req(card->host,
2010                                       &mq->mqrq_cur->mmc_active, NULL);
2011                 }
2012         }
2013
2014         return 0;
2015 }
2016
2017 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2018 {
2019         int ret;
2020         struct mmc_blk_data *md = mq->data;
2021         struct mmc_card *card = md->queue.card;
2022         struct mmc_host *host = card->host;
2023         unsigned long flags;
2024         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2025
2026         if (req && !mq->mqrq_prev->req)
2027                 /* claim host only for the first request */
2028                 mmc_get_card(card);
2029
2030         ret = mmc_blk_part_switch(card, md);
2031         if (ret) {
2032                 if (req) {
2033                         blk_end_request_all(req, -EIO);
2034                 }
2035                 ret = 0;
2036                 goto out;
2037         }
2038
2039         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2040         if (cmd_flags & REQ_DISCARD) {
2041                 /* complete ongoing async transfer before issuing discard */
2042                 if (card->host->areq)
2043                         mmc_blk_issue_rw_rq(mq, NULL);
2044                 if (req->cmd_flags & REQ_SECURE)
2045                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2046                 else
2047                         ret = mmc_blk_issue_discard_rq(mq, req);
2048         } else if (cmd_flags & REQ_FLUSH) {
2049                 /* complete ongoing async transfer before issuing flush */
2050                 if (card->host->areq)
2051                         mmc_blk_issue_rw_rq(mq, NULL);
2052                 ret = mmc_blk_issue_flush(mq, req);
2053         } else {
2054                 if (!req && host->areq) {
2055                         spin_lock_irqsave(&host->context_info.lock, flags);
2056                         host->context_info.is_waiting_last_req = true;
2057                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2058                 }
2059                 ret = mmc_blk_issue_rw_rq(mq, req);
2060         }
2061
2062 out:
2063         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2064              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2065                 /*
2066                  * Release host when there are no more requests
2067                  * and after special request(discard, flush) is done.
2068                  * In case sepecial request, there is no reentry to
2069                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2070                  */
2071                 mmc_put_card(card);
2072         return ret;
2073 }
2074
2075 static inline int mmc_blk_readonly(struct mmc_card *card)
2076 {
2077         return mmc_card_readonly(card) ||
2078                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2079 }
2080
2081 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2082                                               struct device *parent,
2083                                               sector_t size,
2084                                               bool default_ro,
2085                                               const char *subname,
2086                                               int area_type)
2087 {
2088         struct mmc_blk_data *md;
2089         int devidx, ret;
2090
2091         devidx = find_first_zero_bit(dev_use, max_devices);
2092         if (devidx >= max_devices)
2093                 return ERR_PTR(-ENOSPC);
2094         __set_bit(devidx, dev_use);
2095
2096         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2097         if (!md) {
2098                 ret = -ENOMEM;
2099                 goto out;
2100         }
2101
2102         /*
2103          * !subname implies we are creating main mmc_blk_data that will be
2104          * associated with mmc_card with dev_set_drvdata. Due to device
2105          * partitions, devidx will not coincide with a per-physical card
2106          * index anymore so we keep track of a name index.
2107          */
2108         if (!subname) {
2109                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2110                 __set_bit(md->name_idx, name_use);
2111         } else
2112                 md->name_idx = ((struct mmc_blk_data *)
2113                                 dev_to_disk(parent)->private_data)->name_idx;
2114
2115         md->area_type = area_type;
2116
2117         /*
2118          * Set the read-only status based on the supported commands
2119          * and the write protect switch.
2120          */
2121         md->read_only = mmc_blk_readonly(card);
2122
2123         md->disk = alloc_disk(perdev_minors);
2124         if (md->disk == NULL) {
2125                 ret = -ENOMEM;
2126                 goto err_kfree;
2127         }
2128
2129         spin_lock_init(&md->lock);
2130         INIT_LIST_HEAD(&md->part);
2131         md->usage = 1;
2132
2133         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2134         if (ret)
2135                 goto err_putdisk;
2136
2137         md->queue.issue_fn = mmc_blk_issue_rq;
2138         md->queue.data = md;
2139
2140         md->disk->major = MMC_BLOCK_MAJOR;
2141         md->disk->first_minor = devidx * perdev_minors;
2142         md->disk->fops = &mmc_bdops;
2143         md->disk->private_data = md;
2144         md->disk->queue = md->queue.queue;
2145         md->disk->driverfs_dev = parent;
2146         set_disk_ro(md->disk, md->read_only || default_ro);
2147         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2148                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2149
2150         /*
2151          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2152          *
2153          * - be set for removable media with permanent block devices
2154          * - be unset for removable block devices with permanent media
2155          *
2156          * Since MMC block devices clearly fall under the second
2157          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2158          * should use the block device creation/destruction hotplug
2159          * messages to tell when the card is present.
2160          */
2161
2162         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2163                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2164
2165         if (mmc_card_mmc(card))
2166                 blk_queue_logical_block_size(md->queue.queue,
2167                                              card->ext_csd.data_sector_size);
2168         else
2169                 blk_queue_logical_block_size(md->queue.queue, 512);
2170
2171         set_capacity(md->disk, size);
2172
2173         if (mmc_host_cmd23(card->host)) {
2174                 if (mmc_card_mmc(card) ||
2175                     (mmc_card_sd(card) &&
2176                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2177                         md->flags |= MMC_BLK_CMD23;
2178         }
2179
2180         if (mmc_card_mmc(card) &&
2181             md->flags & MMC_BLK_CMD23 &&
2182             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2183              card->ext_csd.rel_sectors)) {
2184                 md->flags |= MMC_BLK_REL_WR;
2185                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2186         }
2187
2188         if (mmc_card_mmc(card) &&
2189             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2190             (md->flags & MMC_BLK_CMD23) &&
2191             card->ext_csd.packed_event_en) {
2192                 if (!mmc_packed_init(&md->queue, card))
2193                         md->flags |= MMC_BLK_PACKED_CMD;
2194         }
2195
2196         return md;
2197
2198  err_putdisk:
2199         put_disk(md->disk);
2200  err_kfree:
2201         kfree(md);
2202  out:
2203         return ERR_PTR(ret);
2204 }
2205
2206 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2207 {
2208         sector_t size;
2209
2210         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2211                 /*
2212                  * The EXT_CSD sector count is in number or 512 byte
2213                  * sectors.
2214                  */
2215                 size = card->ext_csd.sectors;
2216         } else {
2217                 /*
2218                  * The CSD capacity field is in units of read_blkbits.
2219                  * set_capacity takes units of 512 bytes.
2220                  */
2221                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2222         }
2223
2224         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2225                                         MMC_BLK_DATA_AREA_MAIN);
2226 }
2227
2228 static int mmc_blk_alloc_part(struct mmc_card *card,
2229                               struct mmc_blk_data *md,
2230                               unsigned int part_type,
2231                               sector_t size,
2232                               bool default_ro,
2233                               const char *subname,
2234                               int area_type)
2235 {
2236         char cap_str[10];
2237         struct mmc_blk_data *part_md;
2238
2239         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2240                                     subname, area_type);
2241         if (IS_ERR(part_md))
2242                 return PTR_ERR(part_md);
2243         part_md->part_type = part_type;
2244         list_add(&part_md->part, &md->part);
2245
2246         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2247                         cap_str, sizeof(cap_str));
2248         pr_info("%s: %s %s partition %u %s\n",
2249                part_md->disk->disk_name, mmc_card_id(card),
2250                mmc_card_name(card), part_md->part_type, cap_str);
2251         return 0;
2252 }
2253
2254 /* MMC Physical partitions consist of two boot partitions and
2255  * up to four general purpose partitions.
2256  * For each partition enabled in EXT_CSD a block device will be allocatedi
2257  * to provide access to the partition.
2258  */
2259
2260 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2261 {
2262         int idx, ret = 0;
2263
2264         if (!mmc_card_mmc(card))
2265                 return 0;
2266
2267         for (idx = 0; idx < card->nr_parts; idx++) {
2268                 if (card->part[idx].size) {
2269                         ret = mmc_blk_alloc_part(card, md,
2270                                 card->part[idx].part_cfg,
2271                                 card->part[idx].size >> 9,
2272                                 card->part[idx].force_ro,
2273                                 card->part[idx].name,
2274                                 card->part[idx].area_type);
2275                         if (ret)
2276                                 return ret;
2277                 }
2278         }
2279
2280         return ret;
2281 }
2282
2283 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2284 {
2285         struct mmc_card *card;
2286
2287         if (md) {
2288                 /*
2289                  * Flush remaining requests and free queues. It
2290                  * is freeing the queue that stops new requests
2291                  * from being accepted.
2292                  */
2293                 card = md->queue.card;
2294                 mmc_cleanup_queue(&md->queue);
2295                 if (md->flags & MMC_BLK_PACKED_CMD)
2296                         mmc_packed_clean(&md->queue);
2297                 if (md->disk->flags & GENHD_FL_UP) {
2298                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2299                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2300                                         card->ext_csd.boot_ro_lockable)
2301                                 device_remove_file(disk_to_dev(md->disk),
2302                                         &md->power_ro_lock);
2303
2304                         del_gendisk(md->disk);
2305                 }
2306                 mmc_blk_put(md);
2307         }
2308 }
2309
2310 static void mmc_blk_remove_parts(struct mmc_card *card,
2311                                  struct mmc_blk_data *md)
2312 {
2313         struct list_head *pos, *q;
2314         struct mmc_blk_data *part_md;
2315
2316         __clear_bit(md->name_idx, name_use);
2317         list_for_each_safe(pos, q, &md->part) {
2318                 part_md = list_entry(pos, struct mmc_blk_data, part);
2319                 list_del(pos);
2320                 mmc_blk_remove_req(part_md);
2321         }
2322 }
2323
2324 static int mmc_add_disk(struct mmc_blk_data *md)
2325 {
2326         int ret;
2327         struct mmc_card *card = md->queue.card;
2328
2329         add_disk(md->disk);
2330         md->force_ro.show = force_ro_show;
2331         md->force_ro.store = force_ro_store;
2332         sysfs_attr_init(&md->force_ro.attr);
2333         md->force_ro.attr.name = "force_ro";
2334         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2335         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2336         if (ret)
2337                 goto force_ro_fail;
2338
2339         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2340              card->ext_csd.boot_ro_lockable) {
2341                 umode_t mode;
2342
2343                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2344                         mode = S_IRUGO;
2345                 else
2346                         mode = S_IRUGO | S_IWUSR;
2347
2348                 md->power_ro_lock.show = power_ro_lock_show;
2349                 md->power_ro_lock.store = power_ro_lock_store;
2350                 sysfs_attr_init(&md->power_ro_lock.attr);
2351                 md->power_ro_lock.attr.mode = mode;
2352                 md->power_ro_lock.attr.name =
2353                                         "ro_lock_until_next_power_on";
2354                 ret = device_create_file(disk_to_dev(md->disk),
2355                                 &md->power_ro_lock);
2356                 if (ret)
2357                         goto power_ro_lock_fail;
2358         }
2359         return ret;
2360
2361 power_ro_lock_fail:
2362         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2363 force_ro_fail:
2364         del_gendisk(md->disk);
2365
2366         return ret;
2367 }
2368
2369 #define CID_MANFID_SANDISK      0x2
2370 #define CID_MANFID_TOSHIBA      0x11
2371 #define CID_MANFID_MICRON       0x13
2372 #define CID_MANFID_SAMSUNG      0x15
2373
2374 static const struct mmc_fixup blk_fixups[] =
2375 {
2376         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2377                   MMC_QUIRK_INAND_CMD38),
2378         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2379                   MMC_QUIRK_INAND_CMD38),
2380         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2381                   MMC_QUIRK_INAND_CMD38),
2382         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2383                   MMC_QUIRK_INAND_CMD38),
2384         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2385                   MMC_QUIRK_INAND_CMD38),
2386
2387         /*
2388          * Some MMC cards experience performance degradation with CMD23
2389          * instead of CMD12-bounded multiblock transfers. For now we'll
2390          * black list what's bad...
2391          * - Certain Toshiba cards.
2392          *
2393          * N.B. This doesn't affect SD cards.
2394          */
2395         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2396                   MMC_QUIRK_BLK_NO_CMD23),
2397         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2398                   MMC_QUIRK_BLK_NO_CMD23),
2399         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2400                   MMC_QUIRK_BLK_NO_CMD23),
2401
2402         /*
2403          * Some Micron MMC cards needs longer data read timeout than
2404          * indicated in CSD.
2405          */
2406         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2407                   MMC_QUIRK_LONG_READ_TIME),
2408
2409         /*
2410          * On these Samsung MoviNAND parts, performing secure erase or
2411          * secure trim can result in unrecoverable corruption due to a
2412          * firmware bug.
2413          */
2414         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2415                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2416         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2417                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2418         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2419                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2420         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2421                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2422         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2423                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2424         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2425                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2426         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2427                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2428         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2429                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2430
2431         END_FIXUP
2432 };
2433
2434 static int mmc_blk_probe(struct device *dev)
2435 {
2436         struct mmc_card *card = mmc_dev_to_card(dev);
2437         struct mmc_blk_data *md, *part_md;
2438         char cap_str[10];
2439
2440         /*
2441          * Check that the card supports the command class(es) we need.
2442          */
2443         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2444                 return -ENODEV;
2445
2446         mmc_fixup_device(card, blk_fixups);
2447
2448         md = mmc_blk_alloc(card);
2449         if (IS_ERR(md))
2450                 return PTR_ERR(md);
2451
2452         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2453                         cap_str, sizeof(cap_str));
2454         pr_info("%s: %s %s %s %s\n",
2455                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2456                 cap_str, md->read_only ? "(ro)" : "");
2457
2458         if (mmc_blk_alloc_parts(card, md))
2459                 goto out;
2460
2461         dev_set_drvdata(dev, md);
2462
2463         if (mmc_add_disk(md))
2464                 goto out;
2465
2466         list_for_each_entry(part_md, &md->part, part) {
2467                 if (mmc_add_disk(part_md))
2468                         goto out;
2469         }
2470
2471         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2472         pm_runtime_use_autosuspend(&card->dev);
2473
2474         /*
2475          * Don't enable runtime PM for SD-combo cards here. Leave that
2476          * decision to be taken during the SDIO init sequence instead.
2477          */
2478         if (card->type != MMC_TYPE_SD_COMBO) {
2479                 pm_runtime_set_active(&card->dev);
2480                 pm_runtime_enable(&card->dev);
2481         }
2482
2483         return 0;
2484
2485  out:
2486         mmc_blk_remove_parts(card, md);
2487         mmc_blk_remove_req(md);
2488         return 0;
2489 }
2490
2491 static int mmc_blk_remove(struct device *dev)
2492 {
2493         struct mmc_card *card = mmc_dev_to_card(dev);
2494         struct mmc_blk_data *md = dev_get_drvdata(dev);
2495
2496         mmc_blk_remove_parts(card, md);
2497         pm_runtime_get_sync(&card->dev);
2498         mmc_claim_host(card->host);
2499         mmc_blk_part_switch(card, md);
2500         mmc_release_host(card->host);
2501         if (card->type != MMC_TYPE_SD_COMBO)
2502                 pm_runtime_disable(&card->dev);
2503         pm_runtime_put_noidle(&card->dev);
2504         mmc_blk_remove_req(md);
2505         dev_set_drvdata(dev, NULL);
2506
2507         return 0;
2508 }
2509
2510 static int _mmc_blk_suspend(struct device *dev)
2511 {
2512         struct mmc_blk_data *part_md;
2513         struct mmc_blk_data *md = dev_get_drvdata(dev);
2514
2515         if (md) {
2516                 mmc_queue_suspend(&md->queue);
2517                 list_for_each_entry(part_md, &md->part, part) {
2518                         mmc_queue_suspend(&part_md->queue);
2519                 }
2520         }
2521         return 0;
2522 }
2523
2524 static void mmc_blk_shutdown(struct device *dev)
2525 {
2526         _mmc_blk_suspend(dev);
2527 }
2528
2529 #ifdef CONFIG_PM_SLEEP
2530 static int mmc_blk_suspend(struct device *dev)
2531 {
2532         return _mmc_blk_suspend(dev);
2533 }
2534
2535 static int mmc_blk_resume(struct device *dev)
2536 {
2537         struct mmc_blk_data *part_md;
2538         struct mmc_blk_data *md = dev_get_drvdata(dev);
2539
2540         if (md) {
2541                 /*
2542                  * Resume involves the card going into idle state,
2543                  * so current partition is always the main one.
2544                  */
2545                 md->part_curr = md->part_type;
2546                 mmc_queue_resume(&md->queue);
2547                 list_for_each_entry(part_md, &md->part, part) {
2548                         mmc_queue_resume(&part_md->queue);
2549                 }
2550         }
2551         return 0;
2552 }
2553 #endif
2554
2555 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2556
2557 static struct device_driver mmc_driver = {
2558         .name           = "mmcblk",
2559         .pm             = &mmc_blk_pm_ops,
2560         .probe          = mmc_blk_probe,
2561         .remove         = mmc_blk_remove,
2562         .shutdown       = mmc_blk_shutdown,
2563 };
2564
2565 static int __init mmc_blk_init(void)
2566 {
2567         int res;
2568
2569         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2570                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2571
2572         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2573
2574         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2575         if (res)
2576                 goto out;
2577
2578         res = mmc_register_driver(&mmc_driver);
2579         if (res)
2580                 goto out2;
2581
2582         return 0;
2583  out2:
2584         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2585  out:
2586         return res;
2587 }
2588
2589 static void __exit mmc_blk_exit(void)
2590 {
2591         mmc_unregister_driver(&mmc_driver);
2592         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2593 }
2594
2595 module_init(mmc_blk_init);
2596 module_exit(mmc_blk_exit);
2597
2598 MODULE_LICENSE("GPL");
2599 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2600