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
  38 #define CREATE_TRACE_POINTS
  39 #include <trace/events/mmc.h>
  40
  41 #include <linux/mmc/ioctl.h>
  42 #include <linux/mmc/card.h>
  43 #include <linux/mmc/host.h>
  44 #include <linux/mmc/mmc.h>
  45 #include <linux/mmc/sd.h>
  46
  47 #include <asm/uaccess.h>
  48
  49 #include "queue.h"
  50
  51 MODULE_ALIAS("mmc:block");
  52 #ifdef MODULE_PARAM_PREFIX
  53 #undef MODULE_PARAM_PREFIX
  54 #endif
  55 #define MODULE_PARAM_PREFIX "mmcblk."
  56
  57 #define INAND_CMD38_ARG_EXT_CSD  113
  58 #define INAND_CMD38_ARG_ERASE    0x00
  59 #define INAND_CMD38_ARG_TRIM     0x01
  60 #define INAND_CMD38_ARG_SECERASE 0x80
  61 #define INAND_CMD38_ARG_SECTRIM1 0x81
  62 #define INAND_CMD38_ARG_SECTRIM2 0x88
  63 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  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 256 / number of minors per device.
  82  */
  83 static int max_devices;
  84
  85 /* 256 minors, so at most 256 separate devices */
  86 static DECLARE_BITMAP(dev_use, 256);
  87 static DECLARE_BITMAP(name_use, 256);
  88
  89 /*
  90  * There is one mmc_blk_data per slot.
  91  */
  92 struct mmc_blk_data {
  93         spinlock_t      lock;
  94         struct gendisk  *disk;
  95         struct mmc_queue queue;
  96         struct list_head part;
  97
  98         unsigned int    flags;
  99 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 100 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 101 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 102
 103         unsigned int    usage;
 104         unsigned int    read_only;
 105         unsigned int    part_type;
 106         unsigned int    name_idx;
 107         unsigned int    reset_done;
 108 #define MMC_BLK_READ            BIT(0)
 109 #define MMC_BLK_WRITE           BIT(1)
 110 #define MMC_BLK_DISCARD         BIT(2)
 111 #define MMC_BLK_SECDISCARD      BIT(3)
 112
 113         /*
 114          * Only set in main mmc_blk_data associated
 115          * with mmc_card with mmc_set_drvdata, and keeps
 116          * track of the current selected device partition.
 117          */
 118         unsigned int    part_curr;
 119         struct device_attribute force_ro;
 120         struct device_attribute power_ro_lock;
 121         int     area_type;
 122 };
 123
 124 static DEFINE_MUTEX(open_lock);
 125
 126 enum {
 127         MMC_PACKED_NR_IDX = -1,
 128         MMC_PACKED_NR_ZERO,
 129         MMC_PACKED_NR_SINGLE,
 130 };
 131
 132 module_param(perdev_minors, int, 0444);
 133 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 134
 135 static inline int mmc_blk_part_switch(struct mmc_card *card,
 136                                       struct mmc_blk_data *md);
 137 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 138
 139 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 140 {
 141         struct mmc_packed *packed = mqrq->packed;
 142
 143         BUG_ON(!packed);
 144
 145         mqrq->cmd_type = MMC_PACKED_NONE;
 146         packed->nr_entries = MMC_PACKED_NR_ZERO;
 147         packed->idx_failure = MMC_PACKED_NR_IDX;
 148         packed->retries = 0;
 149         packed->blocks = 0;
 150 }
 151
 152 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 153 {
 154         struct mmc_blk_data *md;
 155
 156         mutex_lock(&open_lock);
 157         md = disk->private_data;
 158         if (md && md->usage == 0)
 159                 md = NULL;
 160         if (md)
 161                 md->usage++;
 162         mutex_unlock(&open_lock);
 163
 164         return md;
 165 }
 166
 167 static inline int mmc_get_devidx(struct gendisk *disk)
 168 {
 169         int devidx = disk->first_minor / perdev_minors;
 170         return devidx;
 171 }
 172
 173 static void mmc_blk_put(struct mmc_blk_data *md)
 174 {
 175         mutex_lock(&open_lock);
 176         md->usage--;
 177         if (md->usage == 0) {
 178                 int devidx = mmc_get_devidx(md->disk);
 179                 blk_cleanup_queue(md->queue.queue);
 180
 181                 __clear_bit(devidx, dev_use);
 182
 183                 put_disk(md->disk);
 184                 kfree(md);
 185         }
 186         mutex_unlock(&open_lock);
 187 }
 188
 189 static ssize_t power_ro_lock_show(struct device *dev,
 190                 struct device_attribute *attr, char *buf)
 191 {
 192         int ret;
 193         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 194         struct mmc_card *card = md->queue.card;
 195         int locked = 0;
 196
 197         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 198                 locked = 2;
 199         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 200                 locked = 1;
 201
 202         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 203
 204         return ret;
 205 }
 206
 207 static ssize_t power_ro_lock_store(struct device *dev,
 208                 struct device_attribute *attr, const char *buf, size_t count)
 209 {
 210         int ret;
 211         struct mmc_blk_data *md, *part_md;
 212         struct mmc_card *card;
 213         unsigned long set;
 214
 215         if (kstrtoul(buf, 0, &set))
 216                 return -EINVAL;
 217
 218         if (set != 1)
 219                 return count;
 220
 221         md = mmc_blk_get(dev_to_disk(dev));
 222         card = md->queue.card;
 223
 224         mmc_claim_host(card->host);
 225
 226         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 227                                 card->ext_csd.boot_ro_lock |
 228                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 229                                 card->ext_csd.part_time);
 230         if (ret)
 231                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 232         else
 233                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 234
 235         mmc_release_host(card->host);
 236
 237         if (!ret) {
 238                 pr_info("%s: Locking boot partition ro until next power on\n",
 239                         md->disk->disk_name);
 240                 set_disk_ro(md->disk, 1);
 241
 242                 list_for_each_entry(part_md, &md->part, part)
 243                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 244                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 245                                 set_disk_ro(part_md->disk, 1);
 246                         }
 247         }
 248
 249         mmc_blk_put(md);
 250         return count;
 251 }
 252
 253 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 254                              char *buf)
 255 {
 256         int ret;
 257         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 258
 259         ret = snprintf(buf, PAGE_SIZE, "%d",
 260                        get_disk_ro(dev_to_disk(dev)) ^
 261                        md->read_only);
 262         mmc_blk_put(md);
 263         return ret;
 264 }
 265
 266 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 267                               const char *buf, size_t count)
 268 {
 269         int ret;
 270         char *end;
 271         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 272         unsigned long set = simple_strtoul(buf, &end, 0);
 273         if (end == buf) {
 274                 ret = -EINVAL;
 275                 goto out;
 276         }
 277
 278         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 279         ret = count;
 280 out:
 281         mmc_blk_put(md);
 282         return ret;
 283 }
 284
 285 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 286 {
 287         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 288         int ret = -ENXIO;
 289
 290         mutex_lock(&block_mutex);
 291         if (md) {
 292                 if (md->usage == 2)
 293                         check_disk_change(bdev);
 294                 ret = 0;
 295
 296                 if ((mode & FMODE_WRITE) && md->read_only) {
 297                         mmc_blk_put(md);
 298                         ret = -EROFS;
 299                 }
 300         }
 301         mutex_unlock(&block_mutex);
 302
 303         return ret;
 304 }
 305
 306 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 307 {
 308         struct mmc_blk_data *md = disk->private_data;
 309
 310         mutex_lock(&block_mutex);
 311         mmc_blk_put(md);
 312         mutex_unlock(&block_mutex);
 313 }
 314
 315 static int
 316 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 317 {
 318         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 319         geo->heads = 4;
 320         geo->sectors = 16;
 321         return 0;
 322 }
 323
 324 struct mmc_blk_ioc_data {
 325         struct mmc_ioc_cmd ic;
 326         unsigned char *buf;
 327         u64 buf_bytes;
 328 };
 329
 330 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 331         struct mmc_ioc_cmd __user *user)
 332 {
 333         struct mmc_blk_ioc_data *idata;
 334         int err;
 335
 336         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 337         if (!idata) {
 338                 err = -ENOMEM;
 339                 goto out;
 340         }
 341
 342         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 343                 err = -EFAULT;
 344                 goto idata_err;
 345         }
 346
 347         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 348         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 349                 err = -EOVERFLOW;
 350                 goto idata_err;
 351         }
 352
 353         if (!idata->buf_bytes)
 354                 return idata;
 355
 356         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 357         if (!idata->buf) {
 358                 err = -ENOMEM;
 359                 goto idata_err;
 360         }
 361
 362         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 363                                         idata->ic.data_ptr, idata->buf_bytes)) {
 364                 err = -EFAULT;
 365                 goto copy_err;
 366         }
 367
 368         return idata;
 369
 370 copy_err:
 371         kfree(idata->buf);
 372 idata_err:
 373         kfree(idata);
 374 out:
 375         return ERR_PTR(err);
 376 }
 377
 378 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 379                                        u32 retries_max)
 380 {
 381         int err;
 382         u32 retry_count = 0;
 383
 384         if (!status || !retries_max)
 385                 return -EINVAL;
 386
 387         do {
 388                 err = get_card_status(card, status, 5);
 389                 if (err)
 390                         break;
 391
 392                 if (!R1_STATUS(*status) &&
 393                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 394                         break; /* RPMB programming operation complete */
 395
 396                 /*
 397                  * Rechedule to give the MMC device a chance to continue
 398                  * processing the previous command without being polled too
 399                  * frequently.
 400                  */
 401                 usleep_range(1000, 5000);
 402         } while (++retry_count < retries_max);
 403
 404         if (retry_count == retries_max)
 405                 err = -EPERM;
 406
 407         return err;
 408 }
 409
 410 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 411         struct mmc_ioc_cmd __user *ic_ptr)
 412 {
 413         struct mmc_blk_ioc_data *idata;
 414         struct mmc_blk_data *md;
 415         struct mmc_card *card;
 416         struct mmc_command cmd = {0};
 417         struct mmc_data data = {0};
 418         struct mmc_request mrq = {NULL};
 419         struct scatterlist sg;
 420         int err;
 421         int is_rpmb = false;
 422         u32 status = 0;
 423
 424         /*
 425          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 426          * whole block device, not on a partition.  This prevents overspray
 427          * between sibling partitions.
 428          */
 429         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 430                 return -EPERM;
 431
 432         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 433         if (IS_ERR(idata))
 434                 return PTR_ERR(idata);
 435
 436         md = mmc_blk_get(bdev->bd_disk);
 437         if (!md) {
 438                 err = -EINVAL;
 439                 goto cmd_err;
 440         }
 441
 442         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 443                 is_rpmb = true;
 444
 445         card = md->queue.card;
 446         if (IS_ERR(card)) {
 447                 err = PTR_ERR(card);
 448                 goto cmd_done;
 449         }
 450
 451         cmd.opcode = idata->ic.opcode;
 452         cmd.arg = idata->ic.arg;
 453         cmd.flags = idata->ic.flags;
 454
 455         if (idata->buf_bytes) {
 456                 data.sg = &sg;
 457                 data.sg_len = 1;
 458                 data.blksz = idata->ic.blksz;
 459                 data.blocks = idata->ic.blocks;
 460
 461                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 462
 463                 if (idata->ic.write_flag)
 464                         data.flags = MMC_DATA_WRITE;
 465                 else
 466                         data.flags = MMC_DATA_READ;
 467
 468                 /* data.flags must already be set before doing this. */
 469                 mmc_set_data_timeout(&data, card);
 470
 471                 /* Allow overriding the timeout_ns for empirical tuning. */
 472                 if (idata->ic.data_timeout_ns)
 473                         data.timeout_ns = idata->ic.data_timeout_ns;
 474
 475                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 476                         /*
 477                          * Pretend this is a data transfer and rely on the
 478                          * host driver to compute timeout.  When all host
 479                          * drivers support cmd.cmd_timeout for R1B, this
 480                          * can be changed to:
 481                          *
 482                          *     mrq.data = NULL;
 483                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 484                          */
 485                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 486                 }
 487
 488                 mrq.data = &data;
 489         }
 490
 491         mrq.cmd = &cmd;
 492
 493         mmc_claim_host(card->host);
 494
 495         err = mmc_blk_part_switch(card, md);
 496         if (err)
 497                 goto cmd_rel_host;
 498
 499         if (idata->ic.is_acmd) {
 500                 err = mmc_app_cmd(card->host, card);
 501                 if (err)
 502                         goto cmd_rel_host;
 503         }
 504
 505         if (is_rpmb) {
 506                 err = mmc_set_blockcount(card, data.blocks,
 507                         idata->ic.write_flag & (1 << 31));
 508                 if (err)
 509                         goto cmd_rel_host;
 510         }
 511
 512         mmc_wait_for_req(card->host, &mrq);
 513
 514         if (cmd.error) {
 515                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 516                                                 __func__, cmd.error);
 517                 err = cmd.error;
 518                 goto cmd_rel_host;
 519         }
 520         if (data.error) {
 521                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 522                                                 __func__, data.error);
 523                 err = data.error;
 524                 goto cmd_rel_host;
 525         }
 526
 527         /*
 528          * According to the SD specs, some commands require a delay after
 529          * issuing the command.
 530          */
 531         if (idata->ic.postsleep_min_us)
 532                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 533
 534         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 535                 err = -EFAULT;
 536                 goto cmd_rel_host;
 537         }
 538
 539         if (!idata->ic.write_flag) {
 540                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 541                                                 idata->buf, idata->buf_bytes)) {
 542                         err = -EFAULT;
 543                         goto cmd_rel_host;
 544                 }
 545         }
 546
 547         if (is_rpmb) {
 548                 /*
 549                  * Ensure RPMB command has completed by polling CMD13
 550                  * "Send Status".
 551                  */
 552                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 553                 if (err)
 554                         dev_err(mmc_dev(card->host),
 555                                         "%s: Card Status=0x%08X, error %d\n",
 556                                         __func__, status, err);
 557         }
 558
 559 cmd_rel_host:
 560         mmc_release_host(card->host);
 561
 562 cmd_done:
 563         mmc_blk_put(md);
 564 cmd_err:
 565         kfree(idata->buf);
 566         kfree(idata);
 567         return err;
 568 }
 569
 570 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 571         unsigned int cmd, unsigned long arg)
 572 {
 573         int ret = -EINVAL;
 574         if (cmd == MMC_IOC_CMD)
 575                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 576         return ret;
 577 }
 578
 579 #ifdef CONFIG_COMPAT
 580 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 581         unsigned int cmd, unsigned long arg)
 582 {
 583         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 584 }
 585 #endif
 586
 587 static const struct block_device_operations mmc_bdops = {
 588         .open                   = mmc_blk_open,
 589         .release                = mmc_blk_release,
 590         .getgeo                 = mmc_blk_getgeo,
 591         .owner                  = THIS_MODULE,
 592         .ioctl                  = mmc_blk_ioctl,
 593 #ifdef CONFIG_COMPAT
 594         .compat_ioctl           = mmc_blk_compat_ioctl,
 595 #endif
 596 };
 597
 598 static inline int mmc_blk_part_switch(struct mmc_card *card,
 599                                       struct mmc_blk_data *md)
 600 {
 601         int ret;
 602         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
 603
 604         if (main_md->part_curr == md->part_type)
 605                 return 0;
 606
 607         if (mmc_card_mmc(card)) {
 608                 u8 part_config = card->ext_csd.part_config;
 609
 610                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 611                 part_config |= md->part_type;
 612
 613                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 614                                  EXT_CSD_PART_CONFIG, part_config,
 615                                  card->ext_csd.part_time);
 616                 if (ret)
 617                         return ret;
 618
 619                 card->ext_csd.part_config = part_config;
 620         }
 621
 622         main_md->part_curr = md->part_type;
 623         return 0;
 624 }
 625
 626 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 627 {
 628         int err;
 629         u32 result;
 630         __be32 *blocks;
 631
 632         struct mmc_request mrq = {NULL};
 633         struct mmc_command cmd = {0};
 634         struct mmc_data data = {0};
 635
 636         struct scatterlist sg;
 637
 638         cmd.opcode = MMC_APP_CMD;
 639         cmd.arg = card->rca << 16;
 640         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 641
 642         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 643         if (err)
 644                 return (u32)-1;
 645         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 646                 return (u32)-1;
 647
 648         memset(&cmd, 0, sizeof(struct mmc_command));
 649
 650         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 651         cmd.arg = 0;
 652         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 653
 654         data.blksz = 4;
 655         data.blocks = 1;
 656         data.flags = MMC_DATA_READ;
 657         data.sg = &sg;
 658         data.sg_len = 1;
 659         mmc_set_data_timeout(&data, card);
 660
 661         mrq.cmd = &cmd;
 662         mrq.data = &data;
 663
 664         blocks = kmalloc(4, GFP_KERNEL);
 665         if (!blocks)
 666                 return (u32)-1;
 667
 668         sg_init_one(&sg, blocks, 4);
 669
 670         mmc_wait_for_req(card->host, &mrq);
 671
 672         result = ntohl(*blocks);
 673         kfree(blocks);
 674
 675         if (cmd.error || data.error)
 676                 result = (u32)-1;
 677
 678         return result;
 679 }
 680
 681 static int send_stop(struct mmc_card *card, u32 *status)
 682 {
 683         struct mmc_command cmd = {0};
 684         int err;
 685
 686         cmd.opcode = MMC_STOP_TRANSMISSION;
 687         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 688         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 689         if (err == 0)
 690                 *status = cmd.resp[0];
 691         return err;
 692 }
 693
 694 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 695 {
 696         struct mmc_command cmd = {0};
 697         int err;
 698
 699         cmd.opcode = MMC_SEND_STATUS;
 700         if (!mmc_host_is_spi(card->host))
 701                 cmd.arg = card->rca << 16;
 702         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 703         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 704         if (err == 0)
 705                 *status = cmd.resp[0];
 706         return err;
 707 }
 708
 709 #define ERR_NOMEDIUM    3
 710 #define ERR_RETRY       2
 711 #define ERR_ABORT       1
 712 #define ERR_CONTINUE    0
 713
 714 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 715         bool status_valid, u32 status)
 716 {
 717         switch (error) {
 718         case -EILSEQ:
 719                 /* response crc error, retry the r/w cmd */
 720                 pr_err("%s: %s sending %s command, card status %#x\n",
 721                         req->rq_disk->disk_name, "response CRC error",
 722                         name, status);
 723                 return ERR_RETRY;
 724
 725         case -ETIMEDOUT:
 726                 pr_err("%s: %s sending %s command, card status %#x\n",
 727                         req->rq_disk->disk_name, "timed out", name, status);
 728
 729                 /* If the status cmd initially failed, retry the r/w cmd */
 730                 if (!status_valid) {
 731                         pr_err("%s: status not valid, retrying timeout\n", req->rq_disk->disk_name);
 732                         return ERR_RETRY;
 733                 }
 734                 /*
 735                  * If it was a r/w cmd crc error, or illegal command
 736                  * (eg, issued in wrong state) then retry - we should
 737                  * have corrected the state problem above.
 738                  */
 739                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 740                         pr_err("%s: command error, retrying timeout\n", req->rq_disk->disk_name);
 741                         return ERR_RETRY;
 742                 }
 743
 744                 /* Otherwise abort the command */
 745                 pr_err("%s: not retrying timeout\n", req->rq_disk->disk_name);
 746                 return ERR_ABORT;
 747
 748         default:
 749                 /* We don't understand the error code the driver gave us */
 750                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 751                        req->rq_disk->disk_name, error, status);
 752                 return ERR_ABORT;
 753         }
 754 }
 755
 756 /*
 757  * Initial r/w and stop cmd error recovery.
 758  * We don't know whether the card received the r/w cmd or not, so try to
 759  * restore things back to a sane state.  Essentially, we do this as follows:
 760  * - Obtain card status.  If the first attempt to obtain card status fails,
 761  *   the status word will reflect the failed status cmd, not the failed
 762  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 763  *   longer communicate with the card.
 764  * - Check the card state.  If the card received the cmd but there was a
 765  *   transient problem with the response, it might still be in a data transfer
 766  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 767  * - If the r/w cmd failed due to a response CRC error, it was probably
 768  *   transient, so retry the cmd.
 769  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 770  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 771  *   illegal cmd, retry.
 772  * Otherwise we don't understand what happened, so abort.
 773  */
 774 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 775         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 776 {
 777         bool prev_cmd_status_valid = true;
 778         u32 status, stop_status = 0;
 779         int err, retry;
 780
 781         if (mmc_card_removed(card))
 782                 return ERR_NOMEDIUM;
 783
 784         /*
 785          * Try to get card status which indicates both the card state
 786          * and why there was no response.  If the first attempt fails,
 787          * we can't be sure the returned status is for the r/w command.
 788          */
 789         for (retry = 2; retry >= 0; retry--) {
 790                 err = get_card_status(card, &status, 0);
 791                 if (!err)
 792                         break;
 793
 794                 prev_cmd_status_valid = false;
 795                 pr_err("%s: error %d sending status command, %sing\n",
 796                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 797         }
 798
 799         /* We couldn't get a response from the card.  Give up. */
 800         if (err) {
 801                 /* Check if the card is removed */
 802                 if (mmc_detect_card_removed(card->host))
 803                         return ERR_NOMEDIUM;
 804                 return ERR_ABORT;
 805         }
 806
 807         /* Flag ECC errors */
 808         if ((status & R1_CARD_ECC_FAILED) ||
 809             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 810             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 811                 *ecc_err = 1;
 812
 813         /* Flag General errors */
 814         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 815                 if ((status & R1_ERROR) ||
 816                         (brq->stop.resp[0] & R1_ERROR)) {
 817                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 818                                req->rq_disk->disk_name, __func__,
 819                                brq->stop.resp[0], status);
 820                         *gen_err = 1;
 821                 }
 822
 823         /*
 824          * Check the current card state.  If it is in some data transfer
 825          * mode, tell it to stop (and hopefully transition back to TRAN.)
 826          */
 827         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 828             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 829                 err = send_stop(card, &stop_status);
 830                 if (err)
 831                         pr_err("%s: error %d sending stop command\n",
 832                                req->rq_disk->disk_name, err);
 833
 834                 /*
 835                  * If the stop cmd also timed out, the card is probably
 836                  * not present, so abort.  Other errors are bad news too.
 837                  */
 838                 if (err)
 839                         return ERR_ABORT;
 840                 if (stop_status & R1_CARD_ECC_FAILED)
 841                         *ecc_err = 1;
 842                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 843                         if (stop_status & R1_ERROR) {
 844                                 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
 845                                        req->rq_disk->disk_name, __func__,
 846                                        stop_status);
 847                                 *gen_err = 1;
 848                         }
 849         }
 850
 851         /* Check for set block count errors */
 852         if (brq->sbc.error)
 853                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 854                                 prev_cmd_status_valid, status);
 855
 856         /* Check for r/w command errors */
 857         if (brq->cmd.error)
 858                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 859                                 prev_cmd_status_valid, status);
 860
 861         /* Data errors */
 862         if (!brq->stop.error)
 863                 return ERR_CONTINUE;
 864
 865         /* Now for stop errors.  These aren't fatal to the transfer. */
 866         pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 867                req->rq_disk->disk_name, brq->stop.error,
 868                brq->cmd.resp[0], status);
 869
 870         /*
 871          * Subsitute in our own stop status as this will give the error
 872          * state which happened during the execution of the r/w command.
 873          */
 874         if (stop_status) {
 875                 brq->stop.resp[0] = stop_status;
 876                 brq->stop.error = 0;
 877         }
 878         return ERR_CONTINUE;
 879 }
 880
 881 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 882                          int type)
 883 {
 884         int err;
 885
 886         if (md->reset_done & type)
 887                 return -EEXIST;
 888
 889         md->reset_done |= type;
 890         err = mmc_hw_reset(host);
 891         /* Ensure we switch back to the correct partition */
 892         if (err != -EOPNOTSUPP) {
 893                 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
 894                 int part_err;
 895
 896                 main_md->part_curr = main_md->part_type;
 897                 part_err = mmc_blk_part_switch(host->card, md);
 898                 if (part_err) {
 899                         /*
 900                          * We have failed to get back into the correct
 901                          * partition, so we need to abort the whole request.
 902                          */
 903                         return -ENODEV;
 904                 }
 905         }
 906         return err;
 907 }
 908
 909 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
 910 {
 911         md->reset_done &= ~type;
 912 }
 913
 914 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 915 {
 916         struct mmc_blk_data *md = mq->data;
 917         struct mmc_card *card = md->queue.card;
 918         unsigned int from, nr, arg;
 919         int err = 0, type = MMC_BLK_DISCARD;
 920
 921         if (!mmc_can_erase(card)) {
 922                 err = -EOPNOTSUPP;
 923                 goto out;
 924         }
 925
 926         from = blk_rq_pos(req);
 927         nr = blk_rq_sectors(req);
 928
 929         if (mmc_can_discard(card))
 930                 arg = MMC_DISCARD_ARG;
 931         else if (mmc_can_trim(card))
 932                 arg = MMC_TRIM_ARG;
 933         else
 934                 arg = MMC_ERASE_ARG;
 935 retry:
 936         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 937                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 938                                  INAND_CMD38_ARG_EXT_CSD,
 939                                  arg == MMC_TRIM_ARG ?
 940                                  INAND_CMD38_ARG_TRIM :
 941                                  INAND_CMD38_ARG_ERASE,
 942                                  0);
 943                 if (err)
 944                         goto out;
 945         }
 946         err = mmc_erase(card, from, nr, arg);
 947 out:
 948         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
 949                 goto retry;
 950         if (!err)
 951                 mmc_blk_reset_success(md, type);
 952         blk_end_request(req, err, blk_rq_bytes(req));
 953
 954         return err ? 0 : 1;
 955 }
 956
 957 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 958                                        struct request *req)
 959 {
 960         struct mmc_blk_data *md = mq->data;
 961         struct mmc_card *card = md->queue.card;
 962         unsigned int from, nr, arg, trim_arg, erase_arg;
 963         int err = 0, type = MMC_BLK_SECDISCARD;
 964
 965         if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
 966                 err = -EOPNOTSUPP;
 967                 goto out;
 968         }
 969
 970         from = blk_rq_pos(req);
 971         nr = blk_rq_sectors(req);
 972
 973         /* The sanitize operation is supported at v4.5 only */
 974         if (mmc_can_sanitize(card)) {
 975                 erase_arg = MMC_ERASE_ARG;
 976                 trim_arg = MMC_TRIM_ARG;
 977         } else {
 978                 erase_arg = MMC_SECURE_ERASE_ARG;
 979                 trim_arg = MMC_SECURE_TRIM1_ARG;
 980         }
 981
 982         if (mmc_erase_group_aligned(card, from, nr))
 983                 arg = erase_arg;
 984         else if (mmc_can_trim(card))
 985                 arg = trim_arg;
 986         else {
 987                 err = -EINVAL;
 988                 goto out;
 989         }
 990 retry:
 991         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 992                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 993                                  INAND_CMD38_ARG_EXT_CSD,
 994                                  arg == MMC_SECURE_TRIM1_ARG ?
 995                                  INAND_CMD38_ARG_SECTRIM1 :
 996                                  INAND_CMD38_ARG_SECERASE,
 997                                  0);
 998                 if (err)
 999                         goto out_retry;
1000         }
1001
1002         err = mmc_erase(card, from, nr, arg);
1003         if (err == -EIO)
1004                 goto out_retry;
1005         if (err)
1006                 goto out;
1007
1008         if (arg == MMC_SECURE_TRIM1_ARG) {
1009                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1010                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1011                                          INAND_CMD38_ARG_EXT_CSD,
1012                                          INAND_CMD38_ARG_SECTRIM2,
1013                                          0);
1014                         if (err)
1015                                 goto out_retry;
1016                 }
1017
1018                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1019                 if (err == -EIO)
1020                         goto out_retry;
1021                 if (err)
1022                         goto out;
1023         }
1024
1025         if (mmc_can_sanitize(card)) {
1026                 trace_mmc_blk_erase_start(EXT_CSD_SANITIZE_START, 0, 0);
1027                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1028                                  EXT_CSD_SANITIZE_START, 1, 0);
1029                 trace_mmc_blk_erase_end(EXT_CSD_SANITIZE_START, 0, 0);
1030         }
1031 out_retry:
1032         if (err && !mmc_blk_reset(md, card->host, type))
1033                 goto retry;
1034         if (!err)
1035                 mmc_blk_reset_success(md, type);
1036 out:
1037         blk_end_request(req, err, blk_rq_bytes(req));
1038
1039         return err ? 0 : 1;
1040 }
1041
1042 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1043 {
1044         struct mmc_blk_data *md = mq->data;
1045         struct mmc_card *card = md->queue.card;
1046         int ret = 0;
1047
1048         ret = mmc_flush_cache(card);
1049         if (ret)
1050                 ret = -EIO;
1051
1052         blk_end_request_all(req, ret);
1053
1054         return ret ? 0 : 1;
1055 }
1056
1057 /*
1058  * Reformat current write as a reliable write, supporting
1059  * both legacy and the enhanced reliable write MMC cards.
1060  * In each transfer we'll handle only as much as a single
1061  * reliable write can handle, thus finish the request in
1062  * partial completions.
1063  */
1064 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1065                                     struct mmc_card *card,
1066                                     struct request *req)
1067 {
1068         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1069                 /* Legacy mode imposes restrictions on transfers. */
1070                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1071                         brq->data.blocks = 1;
1072
1073                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1074                         brq->data.blocks = card->ext_csd.rel_sectors;
1075                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1076                         brq->data.blocks = 1;
1077         }
1078 }
1079
1080 #define CMD_ERRORS                                                      \
1081         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1082          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1083          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1084          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1085          R1_CC_ERROR |          /* Card controller error */             \
1086          R1_ERROR)              /* General/unknown error */
1087
1088 static int mmc_blk_err_check(struct mmc_card *card,
1089                              struct mmc_async_req *areq)
1090 {
1091         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1092                                                     mmc_active);
1093         struct mmc_blk_request *brq = &mq_mrq->brq;
1094         struct request *req = mq_mrq->req;
1095         int ecc_err = 0, gen_err = 0;
1096
1097         /*
1098          * sbc.error indicates a problem with the set block count
1099          * command.  No data will have been transferred.
1100          *
1101          * cmd.error indicates a problem with the r/w command.  No
1102          * data will have been transferred.
1103          *
1104          * stop.error indicates a problem with the stop command.  Data
1105          * may have been transferred, or may still be transferring.
1106          */
1107         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1108             brq->data.error) {
1109                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1110                 case ERR_RETRY:
1111                         return MMC_BLK_RETRY;
1112                 case ERR_ABORT:
1113                         return MMC_BLK_ABORT;
1114                 case ERR_NOMEDIUM:
1115                         return MMC_BLK_NOMEDIUM;
1116                 case ERR_CONTINUE:
1117                         break;
1118                 }
1119         }
1120
1121         /*
1122          * Check for errors relating to the execution of the
1123          * initial command - such as address errors.  No data
1124          * has been transferred.
1125          */
1126         if (brq->cmd.resp[0] & CMD_ERRORS) {
1127                 pr_err("%s: r/w command failed, status = %#x\n",
1128                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1129                 return MMC_BLK_ABORT;
1130         }
1131
1132         /*
1133          * Everything else is either success, or a data error of some
1134          * kind.  If it was a write, we may have transitioned to
1135          * program mode, which we have to wait for it to complete.
1136          */
1137         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1138                 u32 status;
1139                 unsigned long timeout;
1140
1141                 /* Check stop command response */
1142                 if (brq->stop.resp[0] & R1_ERROR) {
1143                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1144                                req->rq_disk->disk_name, __func__,
1145                                brq->stop.resp[0]);
1146                         gen_err = 1;
1147                 }
1148
1149                 timeout = jiffies + msecs_to_jiffies(MMC_BLK_TIMEOUT_MS);
1150                 do {
1151                         int err = get_card_status(card, &status, 5);
1152                         if (err) {
1153                                 pr_err("%s: error %d requesting status\n",
1154                                        req->rq_disk->disk_name, err);
1155                                 return MMC_BLK_CMD_ERR;
1156                         }
1157
1158                         if (status & R1_ERROR) {
1159                                 pr_err("%s: %s: general error sending status command, card status %#x\n",
1160                                        req->rq_disk->disk_name, __func__,
1161                                        status);
1162                                 gen_err = 1;
1163                         }
1164
1165                         /* Timeout if the device never becomes ready for data
1166                          * and never leaves the program state.
1167                          */
1168                         if (time_after(jiffies, timeout)) {
1169                                 pr_err("%s: Card stuck in programming state!"\
1170                                         " %s %s\n", mmc_hostname(card->host),
1171                                         req->rq_disk->disk_name, __func__);
1172
1173                                 return MMC_BLK_CMD_ERR;
1174                         }
1175                         /*
1176                          * Some cards mishandle the status bits,
1177                          * so make sure to check both the busy
1178                          * indication and the card state.
1179                          */
1180                 } while (!(status & R1_READY_FOR_DATA) ||
1181                          (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1182         }
1183
1184         /* if general error occurs, retry the write operation. */
1185         if (gen_err) {
1186                 pr_warn("%s: retrying write for general error\n",
1187                                 req->rq_disk->disk_name);
1188                 return MMC_BLK_RETRY;
1189         }
1190
1191         if (brq->data.error) {
1192                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1193                        req->rq_disk->disk_name, brq->data.error,
1194                        (unsigned)blk_rq_pos(req),
1195                        (unsigned)blk_rq_sectors(req),
1196                        brq->cmd.resp[0], brq->stop.resp[0]);
1197
1198                 if (rq_data_dir(req) == READ) {
1199                         if (ecc_err)
1200                                 return MMC_BLK_ECC_ERR;
1201                         return MMC_BLK_DATA_ERR;
1202                 } else {
1203                         return MMC_BLK_CMD_ERR;
1204                 }
1205         }
1206
1207         if (!brq->data.bytes_xfered)
1208                 return MMC_BLK_RETRY;
1209
1210         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1211                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1212                         return MMC_BLK_PARTIAL;
1213                 else
1214                         return MMC_BLK_SUCCESS;
1215         }
1216
1217         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1218                 return MMC_BLK_PARTIAL;
1219
1220         return MMC_BLK_SUCCESS;
1221 }
1222
1223 static int mmc_blk_packed_err_check(struct mmc_card *card,
1224                                     struct mmc_async_req *areq)
1225 {
1226         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1227                         mmc_active);
1228         struct request *req = mq_rq->req;
1229         struct mmc_packed *packed = mq_rq->packed;
1230         int err, check, status;
1231         u8 *ext_csd;
1232
1233         BUG_ON(!packed);
1234
1235         packed->retries--;
1236         check = mmc_blk_err_check(card, areq);
1237         err = get_card_status(card, &status, 0);
1238         if (err) {
1239                 pr_err("%s: error %d sending status command\n",
1240                        req->rq_disk->disk_name, err);
1241                 return MMC_BLK_ABORT;
1242         }
1243
1244         if (status & R1_EXCEPTION_EVENT) {
1245                 ext_csd = kzalloc(512, GFP_KERNEL);
1246                 if (!ext_csd) {
1247                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1248                                req->rq_disk->disk_name);
1249                         return -ENOMEM;
1250                 }
1251
1252                 err = mmc_send_ext_csd(card, ext_csd);
1253                 if (err) {
1254                         pr_err("%s: error %d sending ext_csd\n",
1255                                req->rq_disk->disk_name, err);
1256                         check = MMC_BLK_ABORT;
1257                         goto free;
1258                 }
1259
1260                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1261                      EXT_CSD_PACKED_FAILURE) &&
1262                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1263                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1264                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1265                             EXT_CSD_PACKED_INDEXED_ERROR) {
1266                                 packed->idx_failure =
1267                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1268                                 check = MMC_BLK_PARTIAL;
1269                         }
1270                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1271                                "failure index: %d\n",
1272                                req->rq_disk->disk_name, packed->nr_entries,
1273                                packed->blocks, packed->idx_failure);
1274                 }
1275 free:
1276                 kfree(ext_csd);
1277         }
1278
1279         return check;
1280 }
1281
1282 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1283                                struct mmc_card *card,
1284                                int disable_multi,
1285                                struct mmc_queue *mq)
1286 {
1287         u32 readcmd, writecmd;
1288         struct mmc_blk_request *brq = &mqrq->brq;
1289         struct request *req = mqrq->req;
1290         struct mmc_blk_data *md = mq->data;
1291         bool do_data_tag;
1292
1293         /*
1294          * Reliable writes are used to implement Forced Unit Access and
1295          * REQ_META accesses, and are supported only on MMCs.
1296          *
1297          * XXX: this really needs a good explanation of why REQ_META
1298          * is treated special.
1299          */
1300         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1301                           (req->cmd_flags & REQ_META)) &&
1302                 (rq_data_dir(req) == WRITE) &&
1303                 (md->flags & MMC_BLK_REL_WR);
1304
1305         memset(brq, 0, sizeof(struct mmc_blk_request));
1306         brq->mrq.cmd = &brq->cmd;
1307         brq->mrq.data = &brq->data;
1308
1309         brq->cmd.arg = blk_rq_pos(req);
1310         if (!mmc_card_blockaddr(card))
1311                 brq->cmd.arg <<= 9;
1312         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1313         brq->data.blksz = 512;
1314         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1315         brq->stop.arg = 0;
1316         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1317         brq->data.blocks = blk_rq_sectors(req);
1318
1319         /*
1320          * The block layer doesn't support all sector count
1321          * restrictions, so we need to be prepared for too big
1322          * requests.
1323          */
1324         if (brq->data.blocks > card->host->max_blk_count)
1325                 brq->data.blocks = card->host->max_blk_count;
1326
1327         if (brq->data.blocks > 1) {
1328                 /*
1329                  * After a read error, we redo the request one sector
1330                  * at a time in order to accurately determine which
1331                  * sectors can be read successfully.
1332                  */
1333                 if (disable_multi)
1334                         brq->data.blocks = 1;
1335
1336                 /* Some controllers can't do multiblock reads due to hw bugs */
1337                 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1338                     rq_data_dir(req) == READ)
1339                         brq->data.blocks = 1;
1340         }
1341
1342         if (brq->data.blocks > 1 || do_rel_wr) {
1343                 /* SPI multiblock writes terminate using a special
1344                  * token, not a STOP_TRANSMISSION request.
1345                  */
1346                 if (!mmc_host_is_spi(card->host) ||
1347                     rq_data_dir(req) == READ)
1348                         brq->mrq.stop = &brq->stop;
1349                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1350                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1351         } else {
1352                 brq->mrq.stop = NULL;
1353                 readcmd = MMC_READ_SINGLE_BLOCK;
1354                 writecmd = MMC_WRITE_BLOCK;
1355         }
1356         if (rq_data_dir(req) == READ) {
1357                 brq->cmd.opcode = readcmd;
1358                 brq->data.flags |= MMC_DATA_READ;
1359         } else {
1360                 brq->cmd.opcode = writecmd;
1361                 brq->data.flags |= MMC_DATA_WRITE;
1362         }
1363
1364         if (do_rel_wr)
1365                 mmc_apply_rel_rw(brq, card, req);
1366
1367         /*
1368          * Data tag is used only during writing meta data to speed
1369          * up write and any subsequent read of this meta data
1370          */
1371         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1372                 (req->cmd_flags & REQ_META) &&
1373                 (rq_data_dir(req) == WRITE) &&
1374                 ((brq->data.blocks * brq->data.blksz) >=
1375                  card->ext_csd.data_tag_unit_size);
1376
1377         /*
1378          * Pre-defined multi-block transfers are preferable to
1379          * open ended-ones (and necessary for reliable writes).
1380          * However, it is not sufficient to just send CMD23,
1381          * and avoid the final CMD12, as on an error condition
1382          * CMD12 (stop) needs to be sent anyway. This, coupled
1383          * with Auto-CMD23 enhancements provided by some
1384          * hosts, means that the complexity of dealing
1385          * with this is best left to the host. If CMD23 is
1386          * supported by card and host, we'll fill sbc in and let
1387          * the host deal with handling it correctly. This means
1388          * that for hosts that don't expose MMC_CAP_CMD23, no
1389          * change of behavior will be observed.
1390          *
1391          * N.B: Some MMC cards experience perf degradation.
1392          * We'll avoid using CMD23-bounded multiblock writes for
1393          * these, while retaining features like reliable writes.
1394          */
1395         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1396             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1397              do_data_tag)) {
1398                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1399                 brq->sbc.arg = brq->data.blocks |
1400                         (do_rel_wr ? (1 << 31) : 0) |
1401                         (do_data_tag ? (1 << 29) : 0);
1402                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1403                 brq->mrq.sbc = &brq->sbc;
1404         }
1405
1406         mmc_set_data_timeout(&brq->data, card);
1407
1408         brq->data.sg = mqrq->sg;
1409         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1410
1411         /*
1412          * Adjust the sg list so it is the same size as the
1413          * request.
1414          */
1415         if (brq->data.blocks != blk_rq_sectors(req)) {
1416                 int i, data_size = brq->data.blocks << 9;
1417                 struct scatterlist *sg;
1418
1419                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1420                         data_size -= sg->length;
1421                         if (data_size <= 0) {
1422                                 sg->length += data_size;
1423                                 i++;
1424                                 break;
1425                         }
1426                 }
1427                 brq->data.sg_len = i;
1428         }
1429
1430         mqrq->mmc_active.mrq = &brq->mrq;
1431         mqrq->mmc_active.err_check = mmc_blk_err_check;
1432
1433         mmc_queue_bounce_pre(mqrq);
1434 }
1435
1436 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1437                                           struct mmc_card *card)
1438 {
1439         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1440         unsigned int max_seg_sz = queue_max_segment_size(q);
1441         unsigned int len, nr_segs = 0;
1442
1443         do {
1444                 len = min(hdr_sz, max_seg_sz);
1445                 hdr_sz -= len;
1446                 nr_segs++;
1447         } while (hdr_sz);
1448
1449         return nr_segs;
1450 }
1451
1452 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1453 {
1454         struct request_queue *q = mq->queue;
1455         struct mmc_card *card = mq->card;
1456         struct request *cur = req, *next = NULL;
1457         struct mmc_blk_data *md = mq->data;
1458         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1459         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1460         unsigned int req_sectors = 0, phys_segments = 0;
1461         unsigned int max_blk_count, max_phys_segs;
1462         bool put_back = true;
1463         u8 max_packed_rw = 0;
1464         u8 reqs = 0;
1465
1466         if (!(md->flags & MMC_BLK_PACKED_CMD))
1467                 goto no_packed;
1468
1469         if ((rq_data_dir(cur) == WRITE) &&
1470             mmc_host_packed_wr(card->host))
1471                 max_packed_rw = card->ext_csd.max_packed_writes;
1472
1473         if (max_packed_rw == 0)
1474                 goto no_packed;
1475
1476         if (mmc_req_rel_wr(cur) &&
1477             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1478                 goto no_packed;
1479
1480         if (mmc_large_sector(card) &&
1481             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1482                 goto no_packed;
1483
1484         mmc_blk_clear_packed(mqrq);
1485
1486         max_blk_count = min(card->host->max_blk_count,
1487                             card->host->max_req_size >> 9);
1488         if (unlikely(max_blk_count > 0xffff))
1489                 max_blk_count = 0xffff;
1490
1491         max_phys_segs = queue_max_segments(q);
1492         req_sectors += blk_rq_sectors(cur);
1493         phys_segments += cur->nr_phys_segments;
1494
1495         if (rq_data_dir(cur) == WRITE) {
1496                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1497                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1498         }
1499
1500         do {
1501                 if (reqs >= max_packed_rw - 1) {
1502                         put_back = false;
1503                         break;
1504                 }
1505
1506                 spin_lock_irq(q->queue_lock);
1507                 next = blk_fetch_request(q);
1508                 spin_unlock_irq(q->queue_lock);
1509                 if (!next) {
1510                         put_back = false;
1511                         break;
1512                 }
1513
1514                 if (mmc_large_sector(card) &&
1515                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1516                         break;
1517
1518                 if (next->cmd_flags & REQ_DISCARD ||
1519                     next->cmd_flags & REQ_FLUSH)
1520                         break;
1521
1522                 if (rq_data_dir(cur) != rq_data_dir(next))
1523                         break;
1524
1525                 if (mmc_req_rel_wr(next) &&
1526                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1527                         break;
1528
1529                 req_sectors += blk_rq_sectors(next);
1530                 if (req_sectors > max_blk_count)
1531                         break;
1532
1533                 phys_segments +=  next->nr_phys_segments;
1534                 if (phys_segments > max_phys_segs)
1535                         break;
1536
1537                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1538                 cur = next;
1539                 reqs++;
1540         } while (1);
1541
1542         if (put_back) {
1543                 spin_lock_irq(q->queue_lock);
1544                 blk_requeue_request(q, next);
1545                 spin_unlock_irq(q->queue_lock);
1546         }
1547
1548         if (reqs > 0) {
1549                 list_add(&req->queuelist, &mqrq->packed->list);
1550                 mqrq->packed->nr_entries = ++reqs;
1551                 mqrq->packed->retries = reqs;
1552                 return reqs;
1553         }
1554
1555 no_packed:
1556         mqrq->cmd_type = MMC_PACKED_NONE;
1557         return 0;
1558 }
1559
1560 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1561                                         struct mmc_card *card,
1562                                         struct mmc_queue *mq)
1563 {
1564         struct mmc_blk_request *brq = &mqrq->brq;
1565         struct request *req = mqrq->req;
1566         struct request *prq;
1567         struct mmc_blk_data *md = mq->data;
1568         struct mmc_packed *packed = mqrq->packed;
1569         bool do_rel_wr, do_data_tag;
1570         u32 *packed_cmd_hdr;
1571         u8 hdr_blocks;
1572         u8 i = 1;
1573
1574         BUG_ON(!packed);
1575
1576         mqrq->cmd_type = MMC_PACKED_WRITE;
1577         packed->blocks = 0;
1578         packed->idx_failure = MMC_PACKED_NR_IDX;
1579
1580         packed_cmd_hdr = packed->cmd_hdr;
1581         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1582         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1583                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1584         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1585
1586         /*
1587          * Argument for each entry of packed group
1588          */
1589         list_for_each_entry(prq, &packed->list, queuelist) {
1590                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1591                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1592                         (prq->cmd_flags & REQ_META) &&
1593                         (rq_data_dir(prq) == WRITE) &&
1594                         ((brq->data.blocks * brq->data.blksz) >=
1595                          card->ext_csd.data_tag_unit_size);
1596                 /* Argument of CMD23 */
1597                 packed_cmd_hdr[(i * 2)] =
1598                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1599                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1600                         blk_rq_sectors(prq);
1601                 /* Argument of CMD18 or CMD25 */
1602                 packed_cmd_hdr[((i * 2)) + 1] =
1603                         mmc_card_blockaddr(card) ?
1604                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1605                 packed->blocks += blk_rq_sectors(prq);
1606                 i++;
1607         }
1608
1609         memset(brq, 0, sizeof(struct mmc_blk_request));
1610         brq->mrq.cmd = &brq->cmd;
1611         brq->mrq.data = &brq->data;
1612         brq->mrq.sbc = &brq->sbc;
1613         brq->mrq.stop = &brq->stop;
1614
1615         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1616         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1617         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1618
1619         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1620         brq->cmd.arg = blk_rq_pos(req);
1621         if (!mmc_card_blockaddr(card))
1622                 brq->cmd.arg <<= 9;
1623         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1624
1625         brq->data.blksz = 512;
1626         brq->data.blocks = packed->blocks + hdr_blocks;
1627         brq->data.flags |= MMC_DATA_WRITE;
1628
1629         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1630         brq->stop.arg = 0;
1631         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1632
1633         mmc_set_data_timeout(&brq->data, card);
1634
1635         brq->data.sg = mqrq->sg;
1636         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1637
1638         mqrq->mmc_active.mrq = &brq->mrq;
1639         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1640
1641         mmc_queue_bounce_pre(mqrq);
1642 }
1643
1644 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1645                            struct mmc_blk_request *brq, struct request *req,
1646                            int ret)
1647 {
1648         struct mmc_queue_req *mq_rq;
1649         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1650
1651         /*
1652          * If this is an SD card and we're writing, we can first
1653          * mark the known good sectors as ok.
1654          *
1655          * If the card is not SD, we can still ok written sectors
1656          * as reported by the controller (which might be less than
1657          * the real number of written sectors, but never more).
1658          */
1659         if (mmc_card_sd(card)) {
1660                 u32 blocks;
1661
1662                 blocks = mmc_sd_num_wr_blocks(card);
1663                 if (blocks != (u32)-1) {
1664                         ret = blk_end_request(req, 0, blocks << 9);
1665                 }
1666         } else {
1667                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1668                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1669         }
1670         return ret;
1671 }
1672
1673 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1674 {
1675         struct request *prq;
1676         struct mmc_packed *packed = mq_rq->packed;
1677         int idx = packed->idx_failure, i = 0;
1678         int ret = 0;
1679
1680         BUG_ON(!packed);
1681
1682         while (!list_empty(&packed->list)) {
1683                 prq = list_entry_rq(packed->list.next);
1684                 if (idx == i) {
1685                         /* retry from error index */
1686                         packed->nr_entries -= idx;
1687                         mq_rq->req = prq;
1688                         ret = 1;
1689
1690                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1691                                 list_del_init(&prq->queuelist);
1692                                 mmc_blk_clear_packed(mq_rq);
1693                         }
1694                         return ret;
1695                 }
1696                 list_del_init(&prq->queuelist);
1697                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1698                 i++;
1699         }
1700
1701         mmc_blk_clear_packed(mq_rq);
1702         return ret;
1703 }
1704
1705 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1706 {
1707         struct request *prq;
1708         struct mmc_packed *packed = mq_rq->packed;
1709
1710         BUG_ON(!packed);
1711
1712         while (!list_empty(&packed->list)) {
1713                 prq = list_entry_rq(packed->list.next);
1714                 list_del_init(&prq->queuelist);
1715                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1716         }
1717
1718         mmc_blk_clear_packed(mq_rq);
1719 }
1720
1721 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1722                                       struct mmc_queue_req *mq_rq)
1723 {
1724         struct request *prq;
1725         struct request_queue *q = mq->queue;
1726         struct mmc_packed *packed = mq_rq->packed;
1727
1728         BUG_ON(!packed);
1729
1730         while (!list_empty(&packed->list)) {
1731                 prq = list_entry_rq(packed->list.prev);
1732                 if (prq->queuelist.prev != &packed->list) {
1733                         list_del_init(&prq->queuelist);
1734                         spin_lock_irq(q->queue_lock);
1735                         blk_requeue_request(mq->queue, prq);
1736                         spin_unlock_irq(q->queue_lock);
1737                 } else {
1738                         list_del_init(&prq->queuelist);
1739                 }
1740         }
1741
1742         mmc_blk_clear_packed(mq_rq);
1743 }
1744
1745 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1746 {
1747         struct mmc_blk_data *md = mq->data;
1748         struct mmc_card *card = md->queue.card;
1749         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1750         int ret = 1, disable_multi = 0, retry = 0, type;
1751         enum mmc_blk_status status;
1752         struct mmc_queue_req *mq_rq;
1753         struct request *req = rqc;
1754         struct mmc_async_req *areq;
1755         const u8 packed_nr = 2;
1756         u8 reqs = 0;
1757
1758         if (!rqc && !mq->mqrq_prev->req)
1759                 return 0;
1760
1761         if (rqc)
1762                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1763
1764         do {
1765                 if (rqc) {
1766                         /*
1767                          * When 4KB native sector is enabled, only 8 blocks
1768                          * multiple read or write is allowed
1769                          */
1770                         if ((brq->data.blocks & 0x07) &&
1771                             (card->ext_csd.data_sector_size == 4096)) {
1772                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1773                                         req->rq_disk->disk_name);
1774                                 mq_rq = mq->mqrq_cur;
1775                                 goto cmd_abort;
1776                         }
1777
1778                         if (reqs >= packed_nr)
1779                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1780                                                             card, mq);
1781                         else
1782                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1783                         areq = &mq->mqrq_cur->mmc_active;
1784                 } else
1785                         areq = NULL;
1786                 areq = mmc_start_req(card->host, areq, (int *) &status);
1787                 if (!areq) {
1788                         if (status == MMC_BLK_NEW_REQUEST)
1789                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1790                         return 0;
1791                 }
1792
1793                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1794                 brq = &mq_rq->brq;
1795                 req = mq_rq->req;
1796                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1797                 mmc_queue_bounce_post(mq_rq);
1798
1799                 switch (status) {
1800                 case MMC_BLK_SUCCESS:
1801                 case MMC_BLK_PARTIAL:
1802                         /*
1803                          * A block was successfully transferred.
1804                          */
1805                         mmc_blk_reset_success(md, type);
1806
1807                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1808                                 ret = mmc_blk_end_packed_req(mq_rq);
1809                                 break;
1810                         } else {
1811                                 ret = blk_end_request(req, 0,
1812                                                 brq->data.bytes_xfered);
1813                         }
1814
1815                         /*
1816                          * If the blk_end_request function returns non-zero even
1817                          * though all data has been transferred and no errors
1818                          * were returned by the host controller, it's a bug.
1819                          */
1820                         if (status == MMC_BLK_SUCCESS && ret) {
1821                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1822                                        __func__, blk_rq_bytes(req),
1823                                        brq->data.bytes_xfered);
1824                                 rqc = NULL;
1825                                 goto cmd_abort;
1826                         }
1827                         break;
1828                 case MMC_BLK_CMD_ERR:
1829                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1830                         if (!mmc_blk_reset(md, card->host, type))
1831                                 break;
1832                         goto cmd_abort;
1833                 case MMC_BLK_RETRY:
1834                         if (retry++ < 5)
1835                                 break;
1836                         /* Fall through */
1837                 case MMC_BLK_ABORT:
1838                         if (!mmc_blk_reset(md, card->host, type))
1839                                 break;
1840                         goto cmd_abort;
1841                 case MMC_BLK_DATA_ERR: {
1842                         int err;
1843
1844                         err = mmc_blk_reset(md, card->host, type);
1845                         if (!err)
1846                                 break;
1847                         if (err == -ENODEV ||
1848                                 mmc_packed_cmd(mq_rq->cmd_type))
1849                                 goto cmd_abort;
1850                         /* Fall through */
1851                 }
1852                 case MMC_BLK_ECC_ERR:
1853                         if (brq->data.blocks > 1) {
1854                                 /* Redo read one sector at a time */
1855                                 pr_warning("%s: retrying using single block read\n",
1856                                            req->rq_disk->disk_name);
1857                                 disable_multi = 1;
1858                                 break;
1859                         }
1860                         /*
1861                          * After an error, we redo I/O one sector at a
1862                          * time, so we only reach here after trying to
1863                          * read a single sector.
1864                          */
1865                         ret = blk_end_request(req, -EIO,
1866                                                 brq->data.blksz);
1867                         if (!ret)
1868                                 goto start_new_req;
1869                         break;
1870                 case MMC_BLK_NOMEDIUM:
1871                         goto cmd_abort;
1872                 default:
1873                         pr_err("%s: Unhandled return value (%d)",
1874                                         req->rq_disk->disk_name, status);
1875                         goto cmd_abort;
1876                 }
1877
1878                 if (ret) {
1879                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1880                                 if (!mq_rq->packed->retries)
1881                                         goto cmd_abort;
1882                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1883                                 mmc_start_req(card->host,
1884                                               &mq_rq->mmc_active, NULL);
1885                         } else {
1886
1887                                 /*
1888                                  * In case of a incomplete request
1889                                  * prepare it again and resend.
1890                                  */
1891                                 mmc_blk_rw_rq_prep(mq_rq, card,
1892                                                 disable_multi, mq);
1893                                 mmc_start_req(card->host,
1894                                                 &mq_rq->mmc_active, NULL);
1895                         }
1896                 }
1897         } while (ret);
1898
1899         return 1;
1900
1901  cmd_abort:
1902         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1903                 mmc_blk_abort_packed_req(mq_rq);
1904         } else {
1905                 if (mmc_card_removed(card))
1906                         req->cmd_flags |= REQ_QUIET;
1907                 while (ret)
1908                         ret = blk_end_request(req, -EIO,
1909                                         blk_rq_cur_bytes(req));
1910         }
1911
1912  start_new_req:
1913         if (rqc) {
1914                 if (mmc_card_removed(card)) {
1915                         rqc->cmd_flags |= REQ_QUIET;
1916                         blk_end_request_all(rqc, -EIO);
1917                 } else {
1918                         /*
1919                          * If current request is packed, it needs to put back.
1920                          */
1921                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1922                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1923
1924                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1925                         mmc_start_req(card->host,
1926                                       &mq->mqrq_cur->mmc_active, NULL);
1927                 }
1928         }
1929
1930         return 0;
1931 }
1932
1933 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1934 {
1935         int ret;
1936         struct mmc_blk_data *md = mq->data;
1937         struct mmc_card *card = md->queue.card;
1938         struct mmc_host *host = card->host;
1939         unsigned long flags;
1940         unsigned int cmd_flags = req ? req->cmd_flags : 0;
1941
1942 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
1943         if (mmc_bus_needs_resume(card->host))
1944                 mmc_resume_bus(card->host);
1945 #endif
1946
1947         if (req && !mq->mqrq_prev->req)
1948                 /* claim host only for the first request */
1949                 mmc_claim_host(card->host);
1950
1951         ret = mmc_blk_part_switch(card, md);
1952         if (ret) {
1953                 if (req) {
1954                         blk_end_request_all(req, -EIO);
1955                 }
1956                 ret = 0;
1957                 goto out;
1958         }
1959
1960         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
1961         if (cmd_flags & REQ_DISCARD) {
1962                 /* complete ongoing async transfer before issuing discard */
1963                 if (card->host->areq)
1964                         mmc_blk_issue_rw_rq(mq, NULL);
1965                 if (req->cmd_flags & REQ_SECURE &&
1966                         !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1967                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
1968                 else
1969                         ret = mmc_blk_issue_discard_rq(mq, req);
1970         } else if (cmd_flags & REQ_FLUSH) {
1971                 /* complete ongoing async transfer before issuing flush */
1972                 if (card->host->areq)
1973                         mmc_blk_issue_rw_rq(mq, NULL);
1974                 ret = mmc_blk_issue_flush(mq, req);
1975         } else {
1976                 if (!req && host->areq) {
1977                         spin_lock_irqsave(&host->context_info.lock, flags);
1978                         host->context_info.is_waiting_last_req = true;
1979                         spin_unlock_irqrestore(&host->context_info.lock, flags);
1980                 }
1981                 ret = mmc_blk_issue_rw_rq(mq, req);
1982         }
1983
1984 out:
1985         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
1986              (cmd_flags & MMC_REQ_SPECIAL_MASK))
1987                 /*
1988                  * Release host when there are no more requests
1989                  * and after special request(discard, flush) is done.
1990                  * In case sepecial request, there is no reentry to
1991                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
1992                  */
1993                 mmc_release_host(card->host);
1994         return ret;
1995 }
1996
1997 static inline int mmc_blk_readonly(struct mmc_card *card)
1998 {
1999         return mmc_card_readonly(card) ||
2000                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2001 }
2002
2003 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2004                                               struct device *parent,
2005                                               sector_t size,
2006                                               bool default_ro,
2007                                               const char *subname,
2008                                               int area_type)
2009 {
2010         struct mmc_blk_data *md;
2011         int devidx, ret;
2012
2013         devidx = find_first_zero_bit(dev_use, max_devices);
2014         if (devidx >= max_devices)
2015                 return ERR_PTR(-ENOSPC);
2016         __set_bit(devidx, dev_use);
2017
2018         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2019         if (!md) {
2020                 ret = -ENOMEM;
2021                 goto out;
2022         }
2023
2024         /*
2025          * !subname implies we are creating main mmc_blk_data that will be
2026          * associated with mmc_card with mmc_set_drvdata. Due to device
2027          * partitions, devidx will not coincide with a per-physical card
2028          * index anymore so we keep track of a name index.
2029          */
2030         if (!subname) {
2031                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2032                 __set_bit(md->name_idx, name_use);
2033         } else
2034                 md->name_idx = ((struct mmc_blk_data *)
2035                                 dev_to_disk(parent)->private_data)->name_idx;
2036
2037         md->area_type = area_type;
2038
2039         /*
2040          * Set the read-only status based on the supported commands
2041          * and the write protect switch.
2042          */
2043         md->read_only = mmc_blk_readonly(card);
2044
2045         md->disk = alloc_disk(perdev_minors);
2046         if (md->disk == NULL) {
2047                 ret = -ENOMEM;
2048                 goto err_kfree;
2049         }
2050
2051         spin_lock_init(&md->lock);
2052         INIT_LIST_HEAD(&md->part);
2053         md->usage = 1;
2054
2055         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2056         if (ret)
2057                 goto err_putdisk;
2058
2059         md->queue.issue_fn = mmc_blk_issue_rq;
2060         md->queue.data = md;
2061
2062         md->disk->major = MMC_BLOCK_MAJOR;
2063         md->disk->first_minor = devidx * perdev_minors;
2064         md->disk->fops = &mmc_bdops;
2065         md->disk->private_data = md;
2066         md->disk->queue = md->queue.queue;
2067         md->disk->driverfs_dev = parent;
2068         set_disk_ro(md->disk, md->read_only || default_ro);
2069         md->disk->flags = GENHD_FL_EXT_DEVT;
2070         if (area_type & MMC_BLK_DATA_AREA_RPMB)
2071                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2072
2073         /*
2074          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2075          *
2076          * - be set for removable media with permanent block devices
2077          * - be unset for removable block devices with permanent media
2078          *
2079          * Since MMC block devices clearly fall under the second
2080          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2081          * should use the block device creation/destruction hotplug
2082          * messages to tell when the card is present.
2083          */
2084
2085         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2086                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2087
2088         if (mmc_card_mmc(card))
2089                 blk_queue_logical_block_size(md->queue.queue,
2090                                              card->ext_csd.data_sector_size);
2091         else
2092                 blk_queue_logical_block_size(md->queue.queue, 512);
2093
2094         set_capacity(md->disk, size);
2095
2096         if (mmc_host_cmd23(card->host)) {
2097                 if (mmc_card_mmc(card) ||
2098                     (mmc_card_sd(card) &&
2099                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2100                         md->flags |= MMC_BLK_CMD23;
2101         }
2102
2103         if (mmc_card_mmc(card) &&
2104             md->flags & MMC_BLK_CMD23 &&
2105             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2106              card->ext_csd.rel_sectors)) {
2107                 md->flags |= MMC_BLK_REL_WR;
2108                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2109         }
2110
2111         if (mmc_card_mmc(card) &&
2112             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2113             (md->flags & MMC_BLK_CMD23) &&
2114             card->ext_csd.packed_event_en) {
2115                 if (!mmc_packed_init(&md->queue, card))
2116                         md->flags |= MMC_BLK_PACKED_CMD;
2117         }
2118
2119         return md;
2120
2121  err_putdisk:
2122         put_disk(md->disk);
2123  err_kfree:
2124         kfree(md);
2125  out:
2126         return ERR_PTR(ret);
2127 }
2128
2129 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2130 {
2131         sector_t size;
2132         struct mmc_blk_data *md;
2133
2134         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2135                 /*
2136                  * The EXT_CSD sector count is in number or 512 byte
2137                  * sectors.
2138                  */
2139                 size = card->ext_csd.sectors;
2140         } else {
2141                 /*
2142                  * The CSD capacity field is in units of read_blkbits.
2143                  * set_capacity takes units of 512 bytes.
2144                  */
2145                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2146         }
2147
2148         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2149                                         MMC_BLK_DATA_AREA_MAIN);
2150         return md;
2151 }
2152
2153 static int mmc_blk_alloc_part(struct mmc_card *card,
2154                               struct mmc_blk_data *md,
2155                               unsigned int part_type,
2156                               sector_t size,
2157                               bool default_ro,
2158                               const char *subname,
2159                               int area_type)
2160 {
2161         char cap_str[10];
2162         struct mmc_blk_data *part_md;
2163
2164         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2165                                     subname, area_type);
2166         if (IS_ERR(part_md))
2167                 return PTR_ERR(part_md);
2168         part_md->part_type = part_type;
2169         list_add(&part_md->part, &md->part);
2170
2171         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2172                         cap_str, sizeof(cap_str));
2173         pr_info("%s: %s %s partition %u %s\n",
2174                part_md->disk->disk_name, mmc_card_id(card),
2175                mmc_card_name(card), part_md->part_type, cap_str);
2176         return 0;
2177 }
2178
2179 /* MMC Physical partitions consist of two boot partitions and
2180  * up to four general purpose partitions.
2181  * For each partition enabled in EXT_CSD a block device will be allocatedi
2182  * to provide access to the partition.
2183  */
2184
2185 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2186 {
2187         int idx, ret = 0;
2188
2189         if (!mmc_card_mmc(card))
2190                 return 0;
2191
2192         for (idx = 0; idx < card->nr_parts; idx++) {
2193                 if (card->part[idx].size) {
2194                         ret = mmc_blk_alloc_part(card, md,
2195                                 card->part[idx].part_cfg,
2196                                 card->part[idx].size >> 9,
2197                                 card->part[idx].force_ro,
2198                                 card->part[idx].name,
2199                                 card->part[idx].area_type);
2200                         if (ret)
2201                                 return ret;
2202                 }
2203         }
2204
2205         return ret;
2206 }
2207
2208 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2209 {
2210         struct mmc_card *card;
2211
2212         if (md) {
2213                 card = md->queue.card;
2214                 if (md->disk->flags & GENHD_FL_UP) {
2215                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2216                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2217                                         card->ext_csd.boot_ro_lockable)
2218                                 device_remove_file(disk_to_dev(md->disk),
2219                                         &md->power_ro_lock);
2220
2221                         /* Stop new requests from getting into the queue */
2222                         del_gendisk(md->disk);
2223                 }
2224
2225                 /* Then flush out any already in there */
2226                 mmc_cleanup_queue(&md->queue);
2227                 if (md->flags & MMC_BLK_PACKED_CMD)
2228                         mmc_packed_clean(&md->queue);
2229                 mmc_blk_put(md);
2230         }
2231 }
2232
2233 static void mmc_blk_remove_parts(struct mmc_card *card,
2234                                  struct mmc_blk_data *md)
2235 {
2236         struct list_head *pos, *q;
2237         struct mmc_blk_data *part_md;
2238
2239         __clear_bit(md->name_idx, name_use);
2240         list_for_each_safe(pos, q, &md->part) {
2241                 part_md = list_entry(pos, struct mmc_blk_data, part);
2242                 list_del(pos);
2243                 mmc_blk_remove_req(part_md);
2244         }
2245 }
2246
2247 static int mmc_add_disk(struct mmc_blk_data *md)
2248 {
2249         int ret;
2250         struct mmc_card *card = md->queue.card;
2251
2252         add_disk(md->disk);
2253         md->force_ro.show = force_ro_show;
2254         md->force_ro.store = force_ro_store;
2255         sysfs_attr_init(&md->force_ro.attr);
2256         md->force_ro.attr.name = "force_ro";
2257         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2258         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2259         if (ret)
2260                 goto force_ro_fail;
2261
2262         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2263              card->ext_csd.boot_ro_lockable) {
2264                 umode_t mode;
2265
2266                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2267                         mode = S_IRUGO;
2268                 else
2269                         mode = S_IRUGO | S_IWUSR;
2270
2271                 md->power_ro_lock.show = power_ro_lock_show;
2272                 md->power_ro_lock.store = power_ro_lock_store;
2273                 sysfs_attr_init(&md->power_ro_lock.attr);
2274                 md->power_ro_lock.attr.mode = mode;
2275                 md->power_ro_lock.attr.name =
2276                                         "ro_lock_until_next_power_on";
2277                 ret = device_create_file(disk_to_dev(md->disk),
2278                                 &md->power_ro_lock);
2279                 if (ret)
2280                         goto power_ro_lock_fail;
2281         }
2282         return ret;
2283
2284 power_ro_lock_fail:
2285         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2286 force_ro_fail:
2287         del_gendisk(md->disk);
2288
2289         return ret;
2290 }
2291
2292 #define CID_MANFID_SANDISK      0x2
2293 #define CID_MANFID_TOSHIBA      0x11
2294 #define CID_MANFID_MICRON       0x13
2295 #define CID_MANFID_SAMSUNG      0x15
2296
2297 static const struct mmc_fixup blk_fixups[] =
2298 {
2299         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2300                   MMC_QUIRK_INAND_CMD38),
2301         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2302                   MMC_QUIRK_INAND_CMD38),
2303         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2304                   MMC_QUIRK_INAND_CMD38),
2305         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2306                   MMC_QUIRK_INAND_CMD38),
2307         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2308                   MMC_QUIRK_INAND_CMD38),
2309
2310         /*
2311          * Some MMC cards experience performance degradation with CMD23
2312          * instead of CMD12-bounded multiblock transfers. For now we'll
2313          * black list what's bad...
2314          * - Certain Toshiba cards.
2315          *
2316          * N.B. This doesn't affect SD cards.
2317          */
2318         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2319                   MMC_QUIRK_BLK_NO_CMD23),
2320         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2321                   MMC_QUIRK_BLK_NO_CMD23),
2322         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2323                   MMC_QUIRK_BLK_NO_CMD23),
2324
2325         /*
2326          * Some Micron MMC cards needs longer data read timeout than
2327          * indicated in CSD.
2328          */
2329         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2330                   MMC_QUIRK_LONG_READ_TIME),
2331
2332         /*
2333          * On these Samsung MoviNAND parts, performing secure erase or
2334          * secure trim can result in unrecoverable corruption due to a
2335          * firmware bug.
2336          */
2337         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2338                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2339         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2340                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2341         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2342                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2343         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2344                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2345         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2346                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2347         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2348                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2349         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2350                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2351         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2352                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2353
2354         END_FIXUP
2355 };
2356
2357 static int mmc_blk_probe(struct mmc_card *card)
2358 {
2359         struct mmc_blk_data *md, *part_md;
2360         char cap_str[10];
2361
2362         /*
2363          * Check that the card supports the command class(es) we need.
2364          */
2365         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2366                 return -ENODEV;
2367
2368         md = mmc_blk_alloc(card);
2369         if (IS_ERR(md))
2370                 return PTR_ERR(md);
2371
2372         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2373                         cap_str, sizeof(cap_str));
2374         pr_info("%s: %s %s %s %s\n",
2375                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2376                 cap_str, md->read_only ? "(ro)" : "");
2377
2378         if (mmc_blk_alloc_parts(card, md))
2379                 goto out;
2380
2381         mmc_set_drvdata(card, md);
2382         mmc_fixup_device(card, blk_fixups);
2383
2384 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
2385         mmc_set_bus_resume_policy(card->host, 1);
2386 #endif
2387         if (mmc_add_disk(md))
2388                 goto out;
2389
2390         list_for_each_entry(part_md, &md->part, part) {
2391                 if (mmc_add_disk(part_md))
2392                         goto out;
2393         }
2394         return 0;
2395
2396  out:
2397         mmc_blk_remove_parts(card, md);
2398         mmc_blk_remove_req(md);
2399         return 0;
2400 }
2401
2402 static void mmc_blk_remove(struct mmc_card *card)
2403 {
2404         struct mmc_blk_data *md = mmc_get_drvdata(card);
2405
2406         mmc_blk_remove_parts(card, md);
2407         mmc_claim_host(card->host);
2408         mmc_blk_part_switch(card, md);
2409         mmc_release_host(card->host);
2410         mmc_blk_remove_req(md);
2411         mmc_set_drvdata(card, NULL);
2412 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
2413         mmc_set_bus_resume_policy(card->host, 0);
2414 #endif
2415 }
2416
2417 #ifdef CONFIG_PM
2418 static int mmc_blk_suspend(struct mmc_card *card)
2419 {
2420         struct mmc_blk_data *part_md;
2421         struct mmc_blk_data *md = mmc_get_drvdata(card);
2422
2423         if (md) {
2424                 mmc_queue_suspend(&md->queue);
2425                 list_for_each_entry(part_md, &md->part, part) {
2426                         mmc_queue_suspend(&part_md->queue);
2427                 }
2428         }
2429         return 0;
2430 }
2431
2432 static int mmc_blk_resume(struct mmc_card *card)
2433 {
2434         struct mmc_blk_data *part_md;
2435         struct mmc_blk_data *md = mmc_get_drvdata(card);
2436
2437         if (md) {
2438                 /*
2439                  * Resume involves the card going into idle state,
2440                  * so current partition is always the main one.
2441                  */
2442                 md->part_curr = md->part_type;
2443                 mmc_queue_resume(&md->queue);
2444                 list_for_each_entry(part_md, &md->part, part) {
2445                         mmc_queue_resume(&part_md->queue);
2446                 }
2447         }
2448         return 0;
2449 }
2450 #else
2451 #define mmc_blk_suspend NULL
2452 #define mmc_blk_resume  NULL
2453 #endif
2454
2455 static struct mmc_driver mmc_driver = {
2456         .drv            = {
2457                 .name   = "mmcblk",
2458         },
2459         .probe          = mmc_blk_probe,
2460         .remove         = mmc_blk_remove,
2461         .suspend        = mmc_blk_suspend,
2462         .resume         = mmc_blk_resume,
2463 };
2464
2465 static int __init mmc_blk_init(void)
2466 {
2467         int res;
2468
2469         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2470                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2471
2472         max_devices = 256 / perdev_minors;
2473
2474         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2475         if (res)
2476                 goto out;
2477
2478         res = mmc_register_driver(&mmc_driver);
2479         if (res)
2480                 goto out2;
2481
2482         return 0;
2483  out2:
2484         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2485  out:
2486         return res;
2487 }
2488
2489 static void __exit mmc_blk_exit(void)
2490 {
2491         mmc_unregister_driver(&mmc_driver);
2492         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2493 }
2494
2495 module_init(mmc_blk_init);
2496 module_exit(mmc_blk_exit);
2497
2498 MODULE_LICENSE("GPL");
2499 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2500