drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50 #ifdef MODULE_PARAM_PREFIX
  51 #undef MODULE_PARAM_PREFIX
  52 #endif
  53 #define MODULE_PARAM_PREFIX "mmcblk."
  54
  55 #define INAND_CMD38_ARG_EXT_CSD  113
  56 #define INAND_CMD38_ARG_ERASE    0x00
  57 #define INAND_CMD38_ARG_TRIM     0x01
  58 #define INAND_CMD38_ARG_SECERASE 0x80
  59 #define INAND_CMD38_ARG_SECTRIM1 0x81
  60 #define INAND_CMD38_ARG_SECTRIM2 0x88
  61 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  62 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  63 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  64
  65 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
  66                                   (req->cmd_flags & REQ_META)) && \
  67                                   (rq_data_dir(req) == WRITE))
  68 #define PACKED_CMD_VER  0x01
  69 #define PACKED_CMD_WR   0x02
  70
  71 static DEFINE_MUTEX(block_mutex);
  72
  73 /*
  74  * The defaults come from config options but can be overriden by module
  75  * or bootarg options.
  76  */
  77 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  78
  79 /*
  80  * We've only got one major, so number of mmcblk devices is
  81  * limited to 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 devmaj = MAJOR(disk_devt(disk));
 170         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 171
 172         if (!devmaj)
 173                 devidx = disk->first_minor / perdev_minors;
 174         return devidx;
 175 }
 176
 177 static void mmc_blk_put(struct mmc_blk_data *md)
 178 {
 179         mutex_lock(&open_lock);
 180         md->usage--;
 181         if (md->usage == 0) {
 182                 int devidx = mmc_get_devidx(md->disk);
 183                 blk_cleanup_queue(md->queue.queue);
 184
 185                 __clear_bit(devidx, dev_use);
 186
 187                 put_disk(md->disk);
 188                 kfree(md);
 189         }
 190         mutex_unlock(&open_lock);
 191 }
 192
 193 static ssize_t power_ro_lock_show(struct device *dev,
 194                 struct device_attribute *attr, char *buf)
 195 {
 196         int ret;
 197         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 198         struct mmc_card *card = md->queue.card;
 199         int locked = 0;
 200
 201         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 202                 locked = 2;
 203         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 204                 locked = 1;
 205
 206         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 207
 208         return ret;
 209 }
 210
 211 static ssize_t power_ro_lock_store(struct device *dev,
 212                 struct device_attribute *attr, const char *buf, size_t count)
 213 {
 214         int ret;
 215         struct mmc_blk_data *md, *part_md;
 216         struct mmc_card *card;
 217         unsigned long set;
 218
 219         if (kstrtoul(buf, 0, &set))
 220                 return -EINVAL;
 221
 222         if (set != 1)
 223                 return count;
 224
 225         md = mmc_blk_get(dev_to_disk(dev));
 226         card = md->queue.card;
 227
 228         mmc_get_card(card);
 229
 230         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 231                                 card->ext_csd.boot_ro_lock |
 232                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 233                                 card->ext_csd.part_time);
 234         if (ret)
 235                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 236         else
 237                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 238
 239         mmc_put_card(card);
 240
 241         if (!ret) {
 242                 pr_info("%s: Locking boot partition ro until next power on\n",
 243                         md->disk->disk_name);
 244                 set_disk_ro(md->disk, 1);
 245
 246                 list_for_each_entry(part_md, &md->part, part)
 247                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 248                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 249                                 set_disk_ro(part_md->disk, 1);
 250                         }
 251         }
 252
 253         mmc_blk_put(md);
 254         return count;
 255 }
 256
 257 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 258                              char *buf)
 259 {
 260         int ret;
 261         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 262
 263         ret = snprintf(buf, PAGE_SIZE, "%d",
 264                        get_disk_ro(dev_to_disk(dev)) ^
 265                        md->read_only);
 266         mmc_blk_put(md);
 267         return ret;
 268 }
 269
 270 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 271                               const char *buf, size_t count)
 272 {
 273         int ret;
 274         char *end;
 275         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 276         unsigned long set = simple_strtoul(buf, &end, 0);
 277         if (end == buf) {
 278                 ret = -EINVAL;
 279                 goto out;
 280         }
 281
 282         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 283         ret = count;
 284 out:
 285         mmc_blk_put(md);
 286         return ret;
 287 }
 288
 289 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 290 {
 291         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 292         int ret = -ENXIO;
 293
 294         mutex_lock(&block_mutex);
 295         if (md) {
 296                 if (md->usage == 2)
 297                         check_disk_change(bdev);
 298                 ret = 0;
 299
 300                 if ((mode & FMODE_WRITE) && md->read_only) {
 301                         mmc_blk_put(md);
 302                         ret = -EROFS;
 303                 }
 304         }
 305         mutex_unlock(&block_mutex);
 306
 307         return ret;
 308 }
 309
 310 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 311 {
 312         struct mmc_blk_data *md = disk->private_data;
 313
 314         mutex_lock(&block_mutex);
 315         mmc_blk_put(md);
 316         mutex_unlock(&block_mutex);
 317 }
 318
 319 static int
 320 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 321 {
 322         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 323         geo->heads = 4;
 324         geo->sectors = 16;
 325         return 0;
 326 }
 327
 328 struct mmc_blk_ioc_data {
 329         struct mmc_ioc_cmd ic;
 330         unsigned char *buf;
 331         u64 buf_bytes;
 332 };
 333
 334 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 335         struct mmc_ioc_cmd __user *user)
 336 {
 337         struct mmc_blk_ioc_data *idata;
 338         int err;
 339
 340         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 341         if (!idata) {
 342                 err = -ENOMEM;
 343                 goto out;
 344         }
 345
 346         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 347                 err = -EFAULT;
 348                 goto idata_err;
 349         }
 350
 351         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 352         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 353                 err = -EOVERFLOW;
 354                 goto idata_err;
 355         }
 356
 357         if (!idata->buf_bytes)
 358                 return idata;
 359
 360         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 361         if (!idata->buf) {
 362                 err = -ENOMEM;
 363                 goto idata_err;
 364         }
 365
 366         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 367                                         idata->ic.data_ptr, idata->buf_bytes)) {
 368                 err = -EFAULT;
 369                 goto copy_err;
 370         }
 371
 372         return idata;
 373
 374 copy_err:
 375         kfree(idata->buf);
 376 idata_err:
 377         kfree(idata);
 378 out:
 379         return ERR_PTR(err);
 380 }
 381
 382 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 383                                        u32 retries_max)
 384 {
 385         int err;
 386         u32 retry_count = 0;
 387
 388         if (!status || !retries_max)
 389                 return -EINVAL;
 390
 391         do {
 392                 err = get_card_status(card, status, 5);
 393                 if (err)
 394                         break;
 395
 396                 if (!R1_STATUS(*status) &&
 397                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 398                         break; /* RPMB programming operation complete */
 399
 400                 /*
 401                  * Rechedule to give the MMC device a chance to continue
 402                  * processing the previous command without being polled too
 403                  * frequently.
 404                  */
 405                 usleep_range(1000, 5000);
 406         } while (++retry_count < retries_max);
 407
 408         if (retry_count == retries_max)
 409                 err = -EPERM;
 410
 411         return err;
 412 }
 413
 414 static int ioctl_do_sanitize(struct mmc_card *card)
 415 {
 416         int err;
 417
 418         if (!mmc_can_sanitize(card)) {
 419                         pr_warn("%s: %s - SANITIZE is not supported\n",
 420                                 mmc_hostname(card->host), __func__);
 421                         err = -EOPNOTSUPP;
 422                         goto out;
 423         }
 424
 425         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 426                 mmc_hostname(card->host), __func__);
 427
 428         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 429                                         EXT_CSD_SANITIZE_START, 1,
 430                                         MMC_SANITIZE_REQ_TIMEOUT);
 431
 432         if (err)
 433                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 434                        mmc_hostname(card->host), __func__, err);
 435
 436         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 437                                              __func__);
 438 out:
 439         return err;
 440 }
 441
 442 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 443         struct mmc_ioc_cmd __user *ic_ptr)
 444 {
 445         struct mmc_blk_ioc_data *idata;
 446         struct mmc_blk_data *md;
 447         struct mmc_card *card;
 448         struct mmc_command cmd = {0};
 449         struct mmc_data data = {0};
 450         struct mmc_request mrq = {NULL};
 451         struct scatterlist sg;
 452         int err;
 453         int is_rpmb = false;
 454         u32 status = 0;
 455
 456         /*
 457          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 458          * whole block device, not on a partition.  This prevents overspray
 459          * between sibling partitions.
 460          */
 461         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 462                 return -EPERM;
 463
 464         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 465         if (IS_ERR(idata))
 466                 return PTR_ERR(idata);
 467
 468         md = mmc_blk_get(bdev->bd_disk);
 469         if (!md) {
 470                 err = -EINVAL;
 471                 goto cmd_err;
 472         }
 473
 474         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 475                 is_rpmb = true;
 476
 477         card = md->queue.card;
 478         if (IS_ERR(card)) {
 479                 err = PTR_ERR(card);
 480                 goto cmd_done;
 481         }
 482
 483         cmd.opcode = idata->ic.opcode;
 484         cmd.arg = idata->ic.arg;
 485         cmd.flags = idata->ic.flags;
 486
 487         if (idata->buf_bytes) {
 488                 data.sg = &sg;
 489                 data.sg_len = 1;
 490                 data.blksz = idata->ic.blksz;
 491                 data.blocks = idata->ic.blocks;
 492
 493                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 494
 495                 if (idata->ic.write_flag)
 496                         data.flags = MMC_DATA_WRITE;
 497                 else
 498                         data.flags = MMC_DATA_READ;
 499
 500                 /* data.flags must already be set before doing this. */
 501                 mmc_set_data_timeout(&data, card);
 502
 503                 /* Allow overriding the timeout_ns for empirical tuning. */
 504                 if (idata->ic.data_timeout_ns)
 505                         data.timeout_ns = idata->ic.data_timeout_ns;
 506
 507                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 508                         /*
 509                          * Pretend this is a data transfer and rely on the
 510                          * host driver to compute timeout.  When all host
 511                          * drivers support cmd.cmd_timeout for R1B, this
 512                          * can be changed to:
 513                          *
 514                          *     mrq.data = NULL;
 515                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 516                          */
 517                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 518                 }
 519
 520                 mrq.data = &data;
 521         }
 522
 523         mrq.cmd = &cmd;
 524
 525         mmc_get_card(card);
 526
 527         err = mmc_blk_part_switch(card, md);
 528         if (err)
 529                 goto cmd_rel_host;
 530
 531         if (idata->ic.is_acmd) {
 532                 err = mmc_app_cmd(card->host, card);
 533                 if (err)
 534                         goto cmd_rel_host;
 535         }
 536
 537         if (is_rpmb) {
 538                 err = mmc_set_blockcount(card, data.blocks,
 539                         idata->ic.write_flag & (1 << 31));
 540                 if (err)
 541                         goto cmd_rel_host;
 542         }
 543
 544         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 545             (cmd.opcode == MMC_SWITCH)) {
 546                 err = ioctl_do_sanitize(card);
 547
 548                 if (err)
 549                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 550                                __func__, err);
 551
 552                 goto cmd_rel_host;
 553         }
 554
 555         mmc_wait_for_req(card->host, &mrq);
 556
 557         if (cmd.error) {
 558                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 559                                                 __func__, cmd.error);
 560                 err = cmd.error;
 561                 goto cmd_rel_host;
 562         }
 563         if (data.error) {
 564                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 565                                                 __func__, data.error);
 566                 err = data.error;
 567                 goto cmd_rel_host;
 568         }
 569
 570         /*
 571          * According to the SD specs, some commands require a delay after
 572          * issuing the command.
 573          */
 574         if (idata->ic.postsleep_min_us)
 575                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 576
 577         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 578                 err = -EFAULT;
 579                 goto cmd_rel_host;
 580         }
 581
 582         if (!idata->ic.write_flag) {
 583                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 584                                                 idata->buf, idata->buf_bytes)) {
 585                         err = -EFAULT;
 586                         goto cmd_rel_host;
 587                 }
 588         }
 589
 590         if (is_rpmb) {
 591                 /*
 592                  * Ensure RPMB command has completed by polling CMD13
 593                  * "Send Status".
 594                  */
 595                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 596                 if (err)
 597                         dev_err(mmc_dev(card->host),
 598                                         "%s: Card Status=0x%08X, error %d\n",
 599                                         __func__, status, err);
 600         }
 601
 602 cmd_rel_host:
 603         mmc_put_card(card);
 604
 605 cmd_done:
 606         mmc_blk_put(md);
 607 cmd_err:
 608         kfree(idata->buf);
 609         kfree(idata);
 610         return err;
 611 }
 612
 613 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 614         unsigned int cmd, unsigned long arg)
 615 {
 616         int ret = -EINVAL;
 617         if (cmd == MMC_IOC_CMD)
 618                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 619         return ret;
 620 }
 621
 622 #ifdef CONFIG_COMPAT
 623 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 624         unsigned int cmd, unsigned long arg)
 625 {
 626         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 627 }
 628 #endif
 629
 630 static const struct block_device_operations mmc_bdops = {
 631         .open                   = mmc_blk_open,
 632         .release                = mmc_blk_release,
 633         .getgeo                 = mmc_blk_getgeo,
 634         .owner                  = THIS_MODULE,
 635         .ioctl                  = mmc_blk_ioctl,
 636 #ifdef CONFIG_COMPAT
 637         .compat_ioctl           = mmc_blk_compat_ioctl,
 638 #endif
 639 };
 640
 641 static inline int mmc_blk_part_switch(struct mmc_card *card,
 642                                       struct mmc_blk_data *md)
 643 {
 644         int ret;
 645         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
 646
 647         if (main_md->part_curr == md->part_type)
 648                 return 0;
 649
 650         if (mmc_card_mmc(card)) {
 651                 u8 part_config = card->ext_csd.part_config;
 652
 653                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 654                 part_config |= md->part_type;
 655
 656                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 657                                  EXT_CSD_PART_CONFIG, part_config,
 658                                  card->ext_csd.part_time);
 659                 if (ret)
 660                         return ret;
 661
 662                 card->ext_csd.part_config = part_config;
 663         }
 664
 665         main_md->part_curr = md->part_type;
 666         return 0;
 667 }
 668
 669 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 670 {
 671         int err;
 672         u32 result;
 673         __be32 *blocks;
 674
 675         struct mmc_request mrq = {NULL};
 676         struct mmc_command cmd = {0};
 677         struct mmc_data data = {0};
 678
 679         struct scatterlist sg;
 680
 681         cmd.opcode = MMC_APP_CMD;
 682         cmd.arg = card->rca << 16;
 683         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 684
 685         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 686         if (err)
 687                 return (u32)-1;
 688         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 689                 return (u32)-1;
 690
 691         memset(&cmd, 0, sizeof(struct mmc_command));
 692
 693         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 694         cmd.arg = 0;
 695         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 696
 697         data.blksz = 4;
 698         data.blocks = 1;
 699         data.flags = MMC_DATA_READ;
 700         data.sg = &sg;
 701         data.sg_len = 1;
 702         mmc_set_data_timeout(&data, card);
 703
 704         mrq.cmd = &cmd;
 705         mrq.data = &data;
 706
 707         blocks = kmalloc(4, GFP_KERNEL);
 708         if (!blocks)
 709                 return (u32)-1;
 710
 711         sg_init_one(&sg, blocks, 4);
 712
 713         mmc_wait_for_req(card->host, &mrq);
 714
 715         result = ntohl(*blocks);
 716         kfree(blocks);
 717
 718         if (cmd.error || data.error)
 719                 result = (u32)-1;
 720
 721         return result;
 722 }
 723
 724 static int send_stop(struct mmc_card *card, u32 *status)
 725 {
 726         struct mmc_command cmd = {0};
 727         int err;
 728
 729         cmd.opcode = MMC_STOP_TRANSMISSION;
 730         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 731         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 732         if (err == 0)
 733                 *status = cmd.resp[0];
 734         return err;
 735 }
 736
 737 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 738 {
 739         struct mmc_command cmd = {0};
 740         int err;
 741
 742         cmd.opcode = MMC_SEND_STATUS;
 743         if (!mmc_host_is_spi(card->host))
 744                 cmd.arg = card->rca << 16;
 745         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 746         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 747         if (err == 0)
 748                 *status = cmd.resp[0];
 749         return err;
 750 }
 751
 752 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 753                 bool hw_busy_detect, struct request *req, int *gen_err)
 754 {
 755         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 756         int err = 0;
 757         u32 status;
 758
 759         do {
 760                 err = get_card_status(card, &status, 5);
 761                 if (err) {
 762                         pr_err("%s: error %d requesting status\n",
 763                                req->rq_disk->disk_name, err);
 764                         return err;
 765                 }
 766
 767                 if (status & R1_ERROR) {
 768                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 769                                 req->rq_disk->disk_name, __func__, status);
 770                         *gen_err = 1;
 771                 }
 772
 773                 /* We may rely on the host hw to handle busy detection.*/
 774                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 775                         hw_busy_detect)
 776                         break;
 777
 778                 /*
 779                  * Timeout if the device never becomes ready for data and never
 780                  * leaves the program state.
 781                  */
 782                 if (time_after(jiffies, timeout)) {
 783                         pr_err("%s: Card stuck in programming state! %s %s\n",
 784                                 mmc_hostname(card->host),
 785                                 req->rq_disk->disk_name, __func__);
 786                         return -ETIMEDOUT;
 787                 }
 788
 789                 /*
 790                  * Some cards mishandle the status bits,
 791                  * so make sure to check both the busy
 792                  * indication and the card state.
 793                  */
 794         } while (!(status & R1_READY_FOR_DATA) ||
 795                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 796
 797         return err;
 798 }
 799
 800 #define ERR_NOMEDIUM    3
 801 #define ERR_RETRY       2
 802 #define ERR_ABORT       1
 803 #define ERR_CONTINUE    0
 804
 805 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 806         bool status_valid, u32 status)
 807 {
 808         switch (error) {
 809         case -EILSEQ:
 810                 /* response crc error, retry the r/w cmd */
 811                 pr_err("%s: %s sending %s command, card status %#x\n",
 812                         req->rq_disk->disk_name, "response CRC error",
 813                         name, status);
 814                 return ERR_RETRY;
 815
 816         case -ETIMEDOUT:
 817                 pr_err("%s: %s sending %s command, card status %#x\n",
 818                         req->rq_disk->disk_name, "timed out", name, status);
 819
 820                 /* If the status cmd initially failed, retry the r/w cmd */
 821                 if (!status_valid)
 822                         return ERR_RETRY;
 823
 824                 /*
 825                  * If it was a r/w cmd crc error, or illegal command
 826                  * (eg, issued in wrong state) then retry - we should
 827                  * have corrected the state problem above.
 828                  */
 829                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 830                         return ERR_RETRY;
 831
 832                 /* Otherwise abort the command */
 833                 return ERR_ABORT;
 834
 835         default:
 836                 /* We don't understand the error code the driver gave us */
 837                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 838                        req->rq_disk->disk_name, error, status);
 839                 return ERR_ABORT;
 840         }
 841 }
 842
 843 /*
 844  * Initial r/w and stop cmd error recovery.
 845  * We don't know whether the card received the r/w cmd or not, so try to
 846  * restore things back to a sane state.  Essentially, we do this as follows:
 847  * - Obtain card status.  If the first attempt to obtain card status fails,
 848  *   the status word will reflect the failed status cmd, not the failed
 849  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 850  *   longer communicate with the card.
 851  * - Check the card state.  If the card received the cmd but there was a
 852  *   transient problem with the response, it might still be in a data transfer
 853  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 854  * - If the r/w cmd failed due to a response CRC error, it was probably
 855  *   transient, so retry the cmd.
 856  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 857  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 858  *   illegal cmd, retry.
 859  * Otherwise we don't understand what happened, so abort.
 860  */
 861 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 862         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 863 {
 864         bool prev_cmd_status_valid = true;
 865         u32 status, stop_status = 0;
 866         int err, retry;
 867
 868         if (mmc_card_removed(card))
 869                 return ERR_NOMEDIUM;
 870
 871         /*
 872          * Try to get card status which indicates both the card state
 873          * and why there was no response.  If the first attempt fails,
 874          * we can't be sure the returned status is for the r/w command.
 875          */
 876         for (retry = 2; retry >= 0; retry--) {
 877                 err = get_card_status(card, &status, 0);
 878                 if (!err)
 879                         break;
 880
 881                 prev_cmd_status_valid = false;
 882                 pr_err("%s: error %d sending status command, %sing\n",
 883                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 884         }
 885
 886         /* We couldn't get a response from the card.  Give up. */
 887         if (err) {
 888                 /* Check if the card is removed */
 889                 if (mmc_detect_card_removed(card->host))
 890                         return ERR_NOMEDIUM;
 891                 return ERR_ABORT;
 892         }
 893
 894         /* Flag ECC errors */
 895         if ((status & R1_CARD_ECC_FAILED) ||
 896             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 897             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 898                 *ecc_err = 1;
 899
 900         /* Flag General errors */
 901         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 902                 if ((status & R1_ERROR) ||
 903                         (brq->stop.resp[0] & R1_ERROR)) {
 904                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 905                                req->rq_disk->disk_name, __func__,
 906                                brq->stop.resp[0], status);
 907                         *gen_err = 1;
 908                 }
 909
 910         /*
 911          * Check the current card state.  If it is in some data transfer
 912          * mode, tell it to stop (and hopefully transition back to TRAN.)
 913          */
 914         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 915             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 916                 err = send_stop(card, &stop_status);
 917                 if (err)
 918                         pr_err("%s: error %d sending stop command\n",
 919                                req->rq_disk->disk_name, err);
 920
 921                 /*
 922                  * If the stop cmd also timed out, the card is probably
 923                  * not present, so abort.  Other errors are bad news too.
 924                  */
 925                 if (err)
 926                         return ERR_ABORT;
 927                 if (stop_status & R1_CARD_ECC_FAILED)
 928                         *ecc_err = 1;
 929                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 930                         if (stop_status & R1_ERROR) {
 931                                 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
 932                                        req->rq_disk->disk_name, __func__,
 933                                        stop_status);
 934                                 *gen_err = 1;
 935                         }
 936         }
 937
 938         /* Check for set block count errors */
 939         if (brq->sbc.error)
 940                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 941                                 prev_cmd_status_valid, status);
 942
 943         /* Check for r/w command errors */
 944         if (brq->cmd.error)
 945                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 946                                 prev_cmd_status_valid, status);
 947
 948         /* Data errors */
 949         if (!brq->stop.error)
 950                 return ERR_CONTINUE;
 951
 952         /* Now for stop errors.  These aren't fatal to the transfer. */
 953         pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 954                req->rq_disk->disk_name, brq->stop.error,
 955                brq->cmd.resp[0], status);
 956
 957         /*
 958          * Subsitute in our own stop status as this will give the error
 959          * state which happened during the execution of the r/w command.
 960          */
 961         if (stop_status) {
 962                 brq->stop.resp[0] = stop_status;
 963                 brq->stop.error = 0;
 964         }
 965         return ERR_CONTINUE;
 966 }
 967
 968 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 969                          int type)
 970 {
 971         int err;
 972
 973         if (md->reset_done & type)
 974                 return -EEXIST;
 975
 976         md->reset_done |= type;
 977         err = mmc_hw_reset(host);
 978         /* Ensure we switch back to the correct partition */
 979         if (err != -EOPNOTSUPP) {
 980                 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
 981                 int part_err;
 982
 983                 main_md->part_curr = main_md->part_type;
 984                 part_err = mmc_blk_part_switch(host->card, md);
 985                 if (part_err) {
 986                         /*
 987                          * We have failed to get back into the correct
 988                          * partition, so we need to abort the whole request.
 989                          */
 990                         return -ENODEV;
 991                 }
 992         }
 993         return err;
 994 }
 995
 996 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
 997 {
 998         md->reset_done &= ~type;
 999 }
1000
1001 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1002 {
1003         struct mmc_blk_data *md = mq->data;
1004         struct mmc_card *card = md->queue.card;
1005         unsigned int from, nr, arg;
1006         int err = 0, type = MMC_BLK_DISCARD;
1007
1008         if (!mmc_can_erase(card)) {
1009                 err = -EOPNOTSUPP;
1010                 goto out;
1011         }
1012
1013         from = blk_rq_pos(req);
1014         nr = blk_rq_sectors(req);
1015
1016         if (mmc_can_discard(card))
1017                 arg = MMC_DISCARD_ARG;
1018         else if (mmc_can_trim(card))
1019                 arg = MMC_TRIM_ARG;
1020         else
1021                 arg = MMC_ERASE_ARG;
1022 retry:
1023         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1024                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1025                                  INAND_CMD38_ARG_EXT_CSD,
1026                                  arg == MMC_TRIM_ARG ?
1027                                  INAND_CMD38_ARG_TRIM :
1028                                  INAND_CMD38_ARG_ERASE,
1029                                  0);
1030                 if (err)
1031                         goto out;
1032         }
1033         err = mmc_erase(card, from, nr, arg);
1034 out:
1035         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1036                 goto retry;
1037         if (!err)
1038                 mmc_blk_reset_success(md, type);
1039         blk_end_request(req, err, blk_rq_bytes(req));
1040
1041         return err ? 0 : 1;
1042 }
1043
1044 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1045                                        struct request *req)
1046 {
1047         struct mmc_blk_data *md = mq->data;
1048         struct mmc_card *card = md->queue.card;
1049         unsigned int from, nr, arg;
1050         int err = 0, type = MMC_BLK_SECDISCARD;
1051
1052         if (!(mmc_can_secure_erase_trim(card))) {
1053                 err = -EOPNOTSUPP;
1054                 goto out;
1055         }
1056
1057         from = blk_rq_pos(req);
1058         nr = blk_rq_sectors(req);
1059
1060         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1061                 arg = MMC_SECURE_TRIM1_ARG;
1062         else
1063                 arg = MMC_SECURE_ERASE_ARG;
1064
1065 retry:
1066         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1067                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1068                                  INAND_CMD38_ARG_EXT_CSD,
1069                                  arg == MMC_SECURE_TRIM1_ARG ?
1070                                  INAND_CMD38_ARG_SECTRIM1 :
1071                                  INAND_CMD38_ARG_SECERASE,
1072                                  0);
1073                 if (err)
1074                         goto out_retry;
1075         }
1076
1077         err = mmc_erase(card, from, nr, arg);
1078         if (err == -EIO)
1079                 goto out_retry;
1080         if (err)
1081                 goto out;
1082
1083         if (arg == MMC_SECURE_TRIM1_ARG) {
1084                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1085                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1086                                          INAND_CMD38_ARG_EXT_CSD,
1087                                          INAND_CMD38_ARG_SECTRIM2,
1088                                          0);
1089                         if (err)
1090                                 goto out_retry;
1091                 }
1092
1093                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1094                 if (err == -EIO)
1095                         goto out_retry;
1096                 if (err)
1097                         goto out;
1098         }
1099
1100 out_retry:
1101         if (err && !mmc_blk_reset(md, card->host, type))
1102                 goto retry;
1103         if (!err)
1104                 mmc_blk_reset_success(md, type);
1105 out:
1106         blk_end_request(req, err, blk_rq_bytes(req));
1107
1108         return err ? 0 : 1;
1109 }
1110
1111 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1112 {
1113         struct mmc_blk_data *md = mq->data;
1114         struct mmc_card *card = md->queue.card;
1115         int ret = 0;
1116
1117         ret = mmc_flush_cache(card);
1118         if (ret)
1119                 ret = -EIO;
1120
1121         blk_end_request_all(req, ret);
1122
1123         return ret ? 0 : 1;
1124 }
1125
1126 /*
1127  * Reformat current write as a reliable write, supporting
1128  * both legacy and the enhanced reliable write MMC cards.
1129  * In each transfer we'll handle only as much as a single
1130  * reliable write can handle, thus finish the request in
1131  * partial completions.
1132  */
1133 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1134                                     struct mmc_card *card,
1135                                     struct request *req)
1136 {
1137         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1138                 /* Legacy mode imposes restrictions on transfers. */
1139                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1140                         brq->data.blocks = 1;
1141
1142                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1143                         brq->data.blocks = card->ext_csd.rel_sectors;
1144                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1145                         brq->data.blocks = 1;
1146         }
1147 }
1148
1149 #define CMD_ERRORS                                                      \
1150         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1151          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1152          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1153          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1154          R1_CC_ERROR |          /* Card controller error */             \
1155          R1_ERROR)              /* General/unknown error */
1156
1157 static int mmc_blk_err_check(struct mmc_card *card,
1158                              struct mmc_async_req *areq)
1159 {
1160         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1161                                                     mmc_active);
1162         struct mmc_blk_request *brq = &mq_mrq->brq;
1163         struct request *req = mq_mrq->req;
1164         int ecc_err = 0, gen_err = 0;
1165
1166         /*
1167          * sbc.error indicates a problem with the set block count
1168          * command.  No data will have been transferred.
1169          *
1170          * cmd.error indicates a problem with the r/w command.  No
1171          * data will have been transferred.
1172          *
1173          * stop.error indicates a problem with the stop command.  Data
1174          * may have been transferred, or may still be transferring.
1175          */
1176         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1177             brq->data.error) {
1178                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1179                 case ERR_RETRY:
1180                         return MMC_BLK_RETRY;
1181                 case ERR_ABORT:
1182                         return MMC_BLK_ABORT;
1183                 case ERR_NOMEDIUM:
1184                         return MMC_BLK_NOMEDIUM;
1185                 case ERR_CONTINUE:
1186                         break;
1187                 }
1188         }
1189
1190         /*
1191          * Check for errors relating to the execution of the
1192          * initial command - such as address errors.  No data
1193          * has been transferred.
1194          */
1195         if (brq->cmd.resp[0] & CMD_ERRORS) {
1196                 pr_err("%s: r/w command failed, status = %#x\n",
1197                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1198                 return MMC_BLK_ABORT;
1199         }
1200
1201         /*
1202          * Everything else is either success, or a data error of some
1203          * kind.  If it was a write, we may have transitioned to
1204          * program mode, which we have to wait for it to complete.
1205          */
1206         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1207                 int err;
1208
1209                 /* Check stop command response */
1210                 if (brq->stop.resp[0] & R1_ERROR) {
1211                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1212                                req->rq_disk->disk_name, __func__,
1213                                brq->stop.resp[0]);
1214                         gen_err = 1;
1215                 }
1216
1217                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1218                                         &gen_err);
1219                 if (err)
1220                         return MMC_BLK_CMD_ERR;
1221         }
1222
1223         /* if general error occurs, retry the write operation. */
1224         if (gen_err) {
1225                 pr_warn("%s: retrying write for general error\n",
1226                                 req->rq_disk->disk_name);
1227                 return MMC_BLK_RETRY;
1228         }
1229
1230         if (brq->data.error) {
1231                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1232                        req->rq_disk->disk_name, brq->data.error,
1233                        (unsigned)blk_rq_pos(req),
1234                        (unsigned)blk_rq_sectors(req),
1235                        brq->cmd.resp[0], brq->stop.resp[0]);
1236
1237                 if (rq_data_dir(req) == READ) {
1238                         if (ecc_err)
1239                                 return MMC_BLK_ECC_ERR;
1240                         return MMC_BLK_DATA_ERR;
1241                 } else {
1242                         return MMC_BLK_CMD_ERR;
1243                 }
1244         }
1245
1246         if (!brq->data.bytes_xfered)
1247                 return MMC_BLK_RETRY;
1248
1249         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1250                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1251                         return MMC_BLK_PARTIAL;
1252                 else
1253                         return MMC_BLK_SUCCESS;
1254         }
1255
1256         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1257                 return MMC_BLK_PARTIAL;
1258
1259         return MMC_BLK_SUCCESS;
1260 }
1261
1262 static int mmc_blk_packed_err_check(struct mmc_card *card,
1263                                     struct mmc_async_req *areq)
1264 {
1265         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1266                         mmc_active);
1267         struct request *req = mq_rq->req;
1268         struct mmc_packed *packed = mq_rq->packed;
1269         int err, check, status;
1270         u8 *ext_csd;
1271
1272         BUG_ON(!packed);
1273
1274         packed->retries--;
1275         check = mmc_blk_err_check(card, areq);
1276         err = get_card_status(card, &status, 0);
1277         if (err) {
1278                 pr_err("%s: error %d sending status command\n",
1279                        req->rq_disk->disk_name, err);
1280                 return MMC_BLK_ABORT;
1281         }
1282
1283         if (status & R1_EXCEPTION_EVENT) {
1284                 ext_csd = kzalloc(512, GFP_KERNEL);
1285                 if (!ext_csd) {
1286                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1287                                req->rq_disk->disk_name);
1288                         return -ENOMEM;
1289                 }
1290
1291                 err = mmc_send_ext_csd(card, ext_csd);
1292                 if (err) {
1293                         pr_err("%s: error %d sending ext_csd\n",
1294                                req->rq_disk->disk_name, err);
1295                         check = MMC_BLK_ABORT;
1296                         goto free;
1297                 }
1298
1299                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1300                      EXT_CSD_PACKED_FAILURE) &&
1301                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1302                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1303                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1304                             EXT_CSD_PACKED_INDEXED_ERROR) {
1305                                 packed->idx_failure =
1306                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1307                                 check = MMC_BLK_PARTIAL;
1308                         }
1309                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1310                                "failure index: %d\n",
1311                                req->rq_disk->disk_name, packed->nr_entries,
1312                                packed->blocks, packed->idx_failure);
1313                 }
1314 free:
1315                 kfree(ext_csd);
1316         }
1317
1318         return check;
1319 }
1320
1321 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1322                                struct mmc_card *card,
1323                                int disable_multi,
1324                                struct mmc_queue *mq)
1325 {
1326         u32 readcmd, writecmd;
1327         struct mmc_blk_request *brq = &mqrq->brq;
1328         struct request *req = mqrq->req;
1329         struct mmc_blk_data *md = mq->data;
1330         bool do_data_tag;
1331
1332         /*
1333          * Reliable writes are used to implement Forced Unit Access and
1334          * REQ_META accesses, and are supported only on MMCs.
1335          *
1336          * XXX: this really needs a good explanation of why REQ_META
1337          * is treated special.
1338          */
1339         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1340                           (req->cmd_flags & REQ_META)) &&
1341                 (rq_data_dir(req) == WRITE) &&
1342                 (md->flags & MMC_BLK_REL_WR);
1343
1344         memset(brq, 0, sizeof(struct mmc_blk_request));
1345         brq->mrq.cmd = &brq->cmd;
1346         brq->mrq.data = &brq->data;
1347
1348         brq->cmd.arg = blk_rq_pos(req);
1349         if (!mmc_card_blockaddr(card))
1350                 brq->cmd.arg <<= 9;
1351         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1352         brq->data.blksz = 512;
1353         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1354         brq->stop.arg = 0;
1355         brq->data.blocks = blk_rq_sectors(req);
1356
1357         /*
1358          * The block layer doesn't support all sector count
1359          * restrictions, so we need to be prepared for too big
1360          * requests.
1361          */
1362         if (brq->data.blocks > card->host->max_blk_count)
1363                 brq->data.blocks = card->host->max_blk_count;
1364
1365         if (brq->data.blocks > 1) {
1366                 /*
1367                  * After a read error, we redo the request one sector
1368                  * at a time in order to accurately determine which
1369                  * sectors can be read successfully.
1370                  */
1371                 if (disable_multi)
1372                         brq->data.blocks = 1;
1373
1374                 /* Some controllers can't do multiblock reads due to hw bugs */
1375                 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1376                     rq_data_dir(req) == READ)
1377                         brq->data.blocks = 1;
1378         }
1379
1380         if (brq->data.blocks > 1 || do_rel_wr) {
1381                 /* SPI multiblock writes terminate using a special
1382                  * token, not a STOP_TRANSMISSION request.
1383                  */
1384                 if (!mmc_host_is_spi(card->host) ||
1385                     rq_data_dir(req) == READ)
1386                         brq->mrq.stop = &brq->stop;
1387                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1388                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1389         } else {
1390                 brq->mrq.stop = NULL;
1391                 readcmd = MMC_READ_SINGLE_BLOCK;
1392                 writecmd = MMC_WRITE_BLOCK;
1393         }
1394         if (rq_data_dir(req) == READ) {
1395                 brq->cmd.opcode = readcmd;
1396                 brq->data.flags |= MMC_DATA_READ;
1397                 if (brq->mrq.stop)
1398                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1399                                         MMC_CMD_AC;
1400         } else {
1401                 brq->cmd.opcode = writecmd;
1402                 brq->data.flags |= MMC_DATA_WRITE;
1403                 if (brq->mrq.stop)
1404                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1405                                         MMC_CMD_AC;
1406         }
1407
1408         if (do_rel_wr)
1409                 mmc_apply_rel_rw(brq, card, req);
1410
1411         /*
1412          * Data tag is used only during writing meta data to speed
1413          * up write and any subsequent read of this meta data
1414          */
1415         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1416                 (req->cmd_flags & REQ_META) &&
1417                 (rq_data_dir(req) == WRITE) &&
1418                 ((brq->data.blocks * brq->data.blksz) >=
1419                  card->ext_csd.data_tag_unit_size);
1420
1421         /*
1422          * Pre-defined multi-block transfers are preferable to
1423          * open ended-ones (and necessary for reliable writes).
1424          * However, it is not sufficient to just send CMD23,
1425          * and avoid the final CMD12, as on an error condition
1426          * CMD12 (stop) needs to be sent anyway. This, coupled
1427          * with Auto-CMD23 enhancements provided by some
1428          * hosts, means that the complexity of dealing
1429          * with this is best left to the host. If CMD23 is
1430          * supported by card and host, we'll fill sbc in and let
1431          * the host deal with handling it correctly. This means
1432          * that for hosts that don't expose MMC_CAP_CMD23, no
1433          * change of behavior will be observed.
1434          *
1435          * N.B: Some MMC cards experience perf degradation.
1436          * We'll avoid using CMD23-bounded multiblock writes for
1437          * these, while retaining features like reliable writes.
1438          */
1439         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1440             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1441              do_data_tag)) {
1442                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1443                 brq->sbc.arg = brq->data.blocks |
1444                         (do_rel_wr ? (1 << 31) : 0) |
1445                         (do_data_tag ? (1 << 29) : 0);
1446                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1447                 brq->mrq.sbc = &brq->sbc;
1448         }
1449
1450         mmc_set_data_timeout(&brq->data, card);
1451
1452         brq->data.sg = mqrq->sg;
1453         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1454
1455         /*
1456          * Adjust the sg list so it is the same size as the
1457          * request.
1458          */
1459         if (brq->data.blocks != blk_rq_sectors(req)) {
1460                 int i, data_size = brq->data.blocks << 9;
1461                 struct scatterlist *sg;
1462
1463                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1464                         data_size -= sg->length;
1465                         if (data_size <= 0) {
1466                                 sg->length += data_size;
1467                                 i++;
1468                                 break;
1469                         }
1470                 }
1471                 brq->data.sg_len = i;
1472         }
1473
1474         mqrq->mmc_active.mrq = &brq->mrq;
1475         mqrq->mmc_active.err_check = mmc_blk_err_check;
1476
1477         mmc_queue_bounce_pre(mqrq);
1478 }
1479
1480 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1481                                           struct mmc_card *card)
1482 {
1483         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1484         unsigned int max_seg_sz = queue_max_segment_size(q);
1485         unsigned int len, nr_segs = 0;
1486
1487         do {
1488                 len = min(hdr_sz, max_seg_sz);
1489                 hdr_sz -= len;
1490                 nr_segs++;
1491         } while (hdr_sz);
1492
1493         return nr_segs;
1494 }
1495
1496 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1497 {
1498         struct request_queue *q = mq->queue;
1499         struct mmc_card *card = mq->card;
1500         struct request *cur = req, *next = NULL;
1501         struct mmc_blk_data *md = mq->data;
1502         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1503         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1504         unsigned int req_sectors = 0, phys_segments = 0;
1505         unsigned int max_blk_count, max_phys_segs;
1506         bool put_back = true;
1507         u8 max_packed_rw = 0;
1508         u8 reqs = 0;
1509
1510         if (!(md->flags & MMC_BLK_PACKED_CMD))
1511                 goto no_packed;
1512
1513         if ((rq_data_dir(cur) == WRITE) &&
1514             mmc_host_packed_wr(card->host))
1515                 max_packed_rw = card->ext_csd.max_packed_writes;
1516
1517         if (max_packed_rw == 0)
1518                 goto no_packed;
1519
1520         if (mmc_req_rel_wr(cur) &&
1521             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1522                 goto no_packed;
1523
1524         if (mmc_large_sector(card) &&
1525             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1526                 goto no_packed;
1527
1528         mmc_blk_clear_packed(mqrq);
1529
1530         max_blk_count = min(card->host->max_blk_count,
1531                             card->host->max_req_size >> 9);
1532         if (unlikely(max_blk_count > 0xffff))
1533                 max_blk_count = 0xffff;
1534
1535         max_phys_segs = queue_max_segments(q);
1536         req_sectors += blk_rq_sectors(cur);
1537         phys_segments += cur->nr_phys_segments;
1538
1539         if (rq_data_dir(cur) == WRITE) {
1540                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1541                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1542         }
1543
1544         do {
1545                 if (reqs >= max_packed_rw - 1) {
1546                         put_back = false;
1547                         break;
1548                 }
1549
1550                 spin_lock_irq(q->queue_lock);
1551                 next = blk_fetch_request(q);
1552                 spin_unlock_irq(q->queue_lock);
1553                 if (!next) {
1554                         put_back = false;
1555                         break;
1556                 }
1557
1558                 if (mmc_large_sector(card) &&
1559                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1560                         break;
1561
1562                 if (next->cmd_flags & REQ_DISCARD ||
1563                     next->cmd_flags & REQ_FLUSH)
1564                         break;
1565
1566                 if (rq_data_dir(cur) != rq_data_dir(next))
1567                         break;
1568
1569                 if (mmc_req_rel_wr(next) &&
1570                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1571                         break;
1572
1573                 req_sectors += blk_rq_sectors(next);
1574                 if (req_sectors > max_blk_count)
1575                         break;
1576
1577                 phys_segments +=  next->nr_phys_segments;
1578                 if (phys_segments > max_phys_segs)
1579                         break;
1580
1581                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1582                 cur = next;
1583                 reqs++;
1584         } while (1);
1585
1586         if (put_back) {
1587                 spin_lock_irq(q->queue_lock);
1588                 blk_requeue_request(q, next);
1589                 spin_unlock_irq(q->queue_lock);
1590         }
1591
1592         if (reqs > 0) {
1593                 list_add(&req->queuelist, &mqrq->packed->list);
1594                 mqrq->packed->nr_entries = ++reqs;
1595                 mqrq->packed->retries = reqs;
1596                 return reqs;
1597         }
1598
1599 no_packed:
1600         mqrq->cmd_type = MMC_PACKED_NONE;
1601         return 0;
1602 }
1603
1604 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1605                                         struct mmc_card *card,
1606                                         struct mmc_queue *mq)
1607 {
1608         struct mmc_blk_request *brq = &mqrq->brq;
1609         struct request *req = mqrq->req;
1610         struct request *prq;
1611         struct mmc_blk_data *md = mq->data;
1612         struct mmc_packed *packed = mqrq->packed;
1613         bool do_rel_wr, do_data_tag;
1614         u32 *packed_cmd_hdr;
1615         u8 hdr_blocks;
1616         u8 i = 1;
1617
1618         BUG_ON(!packed);
1619
1620         mqrq->cmd_type = MMC_PACKED_WRITE;
1621         packed->blocks = 0;
1622         packed->idx_failure = MMC_PACKED_NR_IDX;
1623
1624         packed_cmd_hdr = packed->cmd_hdr;
1625         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1626         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1627                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1628         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1629
1630         /*
1631          * Argument for each entry of packed group
1632          */
1633         list_for_each_entry(prq, &packed->list, queuelist) {
1634                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1635                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1636                         (prq->cmd_flags & REQ_META) &&
1637                         (rq_data_dir(prq) == WRITE) &&
1638                         ((brq->data.blocks * brq->data.blksz) >=
1639                          card->ext_csd.data_tag_unit_size);
1640                 /* Argument of CMD23 */
1641                 packed_cmd_hdr[(i * 2)] =
1642                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1643                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1644                         blk_rq_sectors(prq);
1645                 /* Argument of CMD18 or CMD25 */
1646                 packed_cmd_hdr[((i * 2)) + 1] =
1647                         mmc_card_blockaddr(card) ?
1648                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1649                 packed->blocks += blk_rq_sectors(prq);
1650                 i++;
1651         }
1652
1653         memset(brq, 0, sizeof(struct mmc_blk_request));
1654         brq->mrq.cmd = &brq->cmd;
1655         brq->mrq.data = &brq->data;
1656         brq->mrq.sbc = &brq->sbc;
1657         brq->mrq.stop = &brq->stop;
1658
1659         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1660         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1661         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1662
1663         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1664         brq->cmd.arg = blk_rq_pos(req);
1665         if (!mmc_card_blockaddr(card))
1666                 brq->cmd.arg <<= 9;
1667         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1668
1669         brq->data.blksz = 512;
1670         brq->data.blocks = packed->blocks + hdr_blocks;
1671         brq->data.flags |= MMC_DATA_WRITE;
1672
1673         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1674         brq->stop.arg = 0;
1675         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1676
1677         mmc_set_data_timeout(&brq->data, card);
1678
1679         brq->data.sg = mqrq->sg;
1680         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1681
1682         mqrq->mmc_active.mrq = &brq->mrq;
1683         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1684
1685         mmc_queue_bounce_pre(mqrq);
1686 }
1687
1688 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1689                            struct mmc_blk_request *brq, struct request *req,
1690                            int ret)
1691 {
1692         struct mmc_queue_req *mq_rq;
1693         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1694
1695         /*
1696          * If this is an SD card and we're writing, we can first
1697          * mark the known good sectors as ok.
1698          *
1699          * If the card is not SD, we can still ok written sectors
1700          * as reported by the controller (which might be less than
1701          * the real number of written sectors, but never more).
1702          */
1703         if (mmc_card_sd(card)) {
1704                 u32 blocks;
1705
1706                 blocks = mmc_sd_num_wr_blocks(card);
1707                 if (blocks != (u32)-1) {
1708                         ret = blk_end_request(req, 0, blocks << 9);
1709                 }
1710         } else {
1711                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1712                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1713         }
1714         return ret;
1715 }
1716
1717 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1718 {
1719         struct request *prq;
1720         struct mmc_packed *packed = mq_rq->packed;
1721         int idx = packed->idx_failure, i = 0;
1722         int ret = 0;
1723
1724         BUG_ON(!packed);
1725
1726         while (!list_empty(&packed->list)) {
1727                 prq = list_entry_rq(packed->list.next);
1728                 if (idx == i) {
1729                         /* retry from error index */
1730                         packed->nr_entries -= idx;
1731                         mq_rq->req = prq;
1732                         ret = 1;
1733
1734                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1735                                 list_del_init(&prq->queuelist);
1736                                 mmc_blk_clear_packed(mq_rq);
1737                         }
1738                         return ret;
1739                 }
1740                 list_del_init(&prq->queuelist);
1741                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1742                 i++;
1743         }
1744
1745         mmc_blk_clear_packed(mq_rq);
1746         return ret;
1747 }
1748
1749 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1750 {
1751         struct request *prq;
1752         struct mmc_packed *packed = mq_rq->packed;
1753
1754         BUG_ON(!packed);
1755
1756         while (!list_empty(&packed->list)) {
1757                 prq = list_entry_rq(packed->list.next);
1758                 list_del_init(&prq->queuelist);
1759                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1760         }
1761
1762         mmc_blk_clear_packed(mq_rq);
1763 }
1764
1765 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1766                                       struct mmc_queue_req *mq_rq)
1767 {
1768         struct request *prq;
1769         struct request_queue *q = mq->queue;
1770         struct mmc_packed *packed = mq_rq->packed;
1771
1772         BUG_ON(!packed);
1773
1774         while (!list_empty(&packed->list)) {
1775                 prq = list_entry_rq(packed->list.prev);
1776                 if (prq->queuelist.prev != &packed->list) {
1777                         list_del_init(&prq->queuelist);
1778                         spin_lock_irq(q->queue_lock);
1779                         blk_requeue_request(mq->queue, prq);
1780                         spin_unlock_irq(q->queue_lock);
1781                 } else {
1782                         list_del_init(&prq->queuelist);
1783                 }
1784         }
1785
1786         mmc_blk_clear_packed(mq_rq);
1787 }
1788
1789 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1790 {
1791         struct mmc_blk_data *md = mq->data;
1792         struct mmc_card *card = md->queue.card;
1793         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1794         int ret = 1, disable_multi = 0, retry = 0, type;
1795         enum mmc_blk_status status;
1796         struct mmc_queue_req *mq_rq;
1797         struct request *req = rqc;
1798         struct mmc_async_req *areq;
1799         const u8 packed_nr = 2;
1800         u8 reqs = 0;
1801
1802         if (!rqc && !mq->mqrq_prev->req)
1803                 return 0;
1804
1805         if (rqc)
1806                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1807
1808         do {
1809                 if (rqc) {
1810                         /*
1811                          * When 4KB native sector is enabled, only 8 blocks
1812                          * multiple read or write is allowed
1813                          */
1814                         if ((brq->data.blocks & 0x07) &&
1815                             (card->ext_csd.data_sector_size == 4096)) {
1816                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1817                                         req->rq_disk->disk_name);
1818                                 mq_rq = mq->mqrq_cur;
1819                                 goto cmd_abort;
1820                         }
1821
1822                         if (reqs >= packed_nr)
1823                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1824                                                             card, mq);
1825                         else
1826                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1827                         areq = &mq->mqrq_cur->mmc_active;
1828                 } else
1829                         areq = NULL;
1830                 areq = mmc_start_req(card->host, areq, (int *) &status);
1831                 if (!areq) {
1832                         if (status == MMC_BLK_NEW_REQUEST)
1833                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1834                         return 0;
1835                 }
1836
1837                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1838                 brq = &mq_rq->brq;
1839                 req = mq_rq->req;
1840                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1841                 mmc_queue_bounce_post(mq_rq);
1842
1843                 switch (status) {
1844                 case MMC_BLK_SUCCESS:
1845                 case MMC_BLK_PARTIAL:
1846                         /*
1847                          * A block was successfully transferred.
1848                          */
1849                         mmc_blk_reset_success(md, type);
1850
1851                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1852                                 ret = mmc_blk_end_packed_req(mq_rq);
1853                                 break;
1854                         } else {
1855                                 ret = blk_end_request(req, 0,
1856                                                 brq->data.bytes_xfered);
1857                         }
1858
1859                         /*
1860                          * If the blk_end_request function returns non-zero even
1861                          * though all data has been transferred and no errors
1862                          * were returned by the host controller, it's a bug.
1863                          */
1864                         if (status == MMC_BLK_SUCCESS && ret) {
1865                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1866                                        __func__, blk_rq_bytes(req),
1867                                        brq->data.bytes_xfered);
1868                                 rqc = NULL;
1869                                 goto cmd_abort;
1870                         }
1871                         break;
1872                 case MMC_BLK_CMD_ERR:
1873                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1874                         if (!mmc_blk_reset(md, card->host, type))
1875                                 break;
1876                         goto cmd_abort;
1877                 case MMC_BLK_RETRY:
1878                         if (retry++ < 5)
1879                                 break;
1880                         /* Fall through */
1881                 case MMC_BLK_ABORT:
1882                         if (!mmc_blk_reset(md, card->host, type))
1883                                 break;
1884                         goto cmd_abort;
1885                 case MMC_BLK_DATA_ERR: {
1886                         int err;
1887
1888                         err = mmc_blk_reset(md, card->host, type);
1889                         if (!err)
1890                                 break;
1891                         if (err == -ENODEV ||
1892                                 mmc_packed_cmd(mq_rq->cmd_type))
1893                                 goto cmd_abort;
1894                         /* Fall through */
1895                 }
1896                 case MMC_BLK_ECC_ERR:
1897                         if (brq->data.blocks > 1) {
1898                                 /* Redo read one sector at a time */
1899                                 pr_warning("%s: retrying using single block read\n",
1900                                            req->rq_disk->disk_name);
1901                                 disable_multi = 1;
1902                                 break;
1903                         }
1904                         /*
1905                          * After an error, we redo I/O one sector at a
1906                          * time, so we only reach here after trying to
1907                          * read a single sector.
1908                          */
1909                         ret = blk_end_request(req, -EIO,
1910                                                 brq->data.blksz);
1911                         if (!ret)
1912                                 goto start_new_req;
1913                         break;
1914                 case MMC_BLK_NOMEDIUM:
1915                         goto cmd_abort;
1916                 default:
1917                         pr_err("%s: Unhandled return value (%d)",
1918                                         req->rq_disk->disk_name, status);
1919                         goto cmd_abort;
1920                 }
1921
1922                 if (ret) {
1923                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1924                                 if (!mq_rq->packed->retries)
1925                                         goto cmd_abort;
1926                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1927                                 mmc_start_req(card->host,
1928                                               &mq_rq->mmc_active, NULL);
1929                         } else {
1930
1931                                 /*
1932                                  * In case of a incomplete request
1933                                  * prepare it again and resend.
1934                                  */
1935                                 mmc_blk_rw_rq_prep(mq_rq, card,
1936                                                 disable_multi, mq);
1937                                 mmc_start_req(card->host,
1938                                                 &mq_rq->mmc_active, NULL);
1939                         }
1940                 }
1941         } while (ret);
1942
1943         return 1;
1944
1945  cmd_abort:
1946         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1947                 mmc_blk_abort_packed_req(mq_rq);
1948         } else {
1949                 if (mmc_card_removed(card))
1950                         req->cmd_flags |= REQ_QUIET;
1951                 while (ret)
1952                         ret = blk_end_request(req, -EIO,
1953                                         blk_rq_cur_bytes(req));
1954         }
1955
1956  start_new_req:
1957         if (rqc) {
1958                 if (mmc_card_removed(card)) {
1959                         rqc->cmd_flags |= REQ_QUIET;
1960                         blk_end_request_all(rqc, -EIO);
1961                 } else {
1962                         /*
1963                          * If current request is packed, it needs to put back.
1964                          */
1965                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1966                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1967
1968                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1969                         mmc_start_req(card->host,
1970                                       &mq->mqrq_cur->mmc_active, NULL);
1971                 }
1972         }
1973
1974         return 0;
1975 }
1976
1977 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1978 {
1979         int ret;
1980         struct mmc_blk_data *md = mq->data;
1981         struct mmc_card *card = md->queue.card;
1982         struct mmc_host *host = card->host;
1983         unsigned long flags;
1984         unsigned int cmd_flags = req ? req->cmd_flags : 0;
1985
1986         if (req && !mq->mqrq_prev->req)
1987                 /* claim host only for the first request */
1988                 mmc_get_card(card);
1989
1990         ret = mmc_blk_part_switch(card, md);
1991         if (ret) {
1992                 if (req) {
1993                         blk_end_request_all(req, -EIO);
1994                 }
1995                 ret = 0;
1996                 goto out;
1997         }
1998
1999         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2000         if (cmd_flags & REQ_DISCARD) {
2001                 /* complete ongoing async transfer before issuing discard */
2002                 if (card->host->areq)
2003                         mmc_blk_issue_rw_rq(mq, NULL);
2004                 if (req->cmd_flags & REQ_SECURE &&
2005                         !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
2006                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2007                 else
2008                         ret = mmc_blk_issue_discard_rq(mq, req);
2009         } else if (cmd_flags & REQ_FLUSH) {
2010                 /* complete ongoing async transfer before issuing flush */
2011                 if (card->host->areq)
2012                         mmc_blk_issue_rw_rq(mq, NULL);
2013                 ret = mmc_blk_issue_flush(mq, req);
2014         } else {
2015                 if (!req && host->areq) {
2016                         spin_lock_irqsave(&host->context_info.lock, flags);
2017                         host->context_info.is_waiting_last_req = true;
2018                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2019                 }
2020                 ret = mmc_blk_issue_rw_rq(mq, req);
2021         }
2022
2023 out:
2024         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2025              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2026                 /*
2027                  * Release host when there are no more requests
2028                  * and after special request(discard, flush) is done.
2029                  * In case sepecial request, there is no reentry to
2030                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2031                  */
2032                 mmc_put_card(card);
2033         return ret;
2034 }
2035
2036 static inline int mmc_blk_readonly(struct mmc_card *card)
2037 {
2038         return mmc_card_readonly(card) ||
2039                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2040 }
2041
2042 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2043                                               struct device *parent,
2044                                               sector_t size,
2045                                               bool default_ro,
2046                                               const char *subname,
2047                                               int area_type)
2048 {
2049         struct mmc_blk_data *md;
2050         int devidx, ret;
2051
2052         devidx = find_first_zero_bit(dev_use, max_devices);
2053         if (devidx >= max_devices)
2054                 return ERR_PTR(-ENOSPC);
2055         __set_bit(devidx, dev_use);
2056
2057         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2058         if (!md) {
2059                 ret = -ENOMEM;
2060                 goto out;
2061         }
2062
2063         /*
2064          * !subname implies we are creating main mmc_blk_data that will be
2065          * associated with mmc_card with mmc_set_drvdata. Due to device
2066          * partitions, devidx will not coincide with a per-physical card
2067          * index anymore so we keep track of a name index.
2068          */
2069         if (!subname) {
2070                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2071                 __set_bit(md->name_idx, name_use);
2072         } else
2073                 md->name_idx = ((struct mmc_blk_data *)
2074                                 dev_to_disk(parent)->private_data)->name_idx;
2075
2076         md->area_type = area_type;
2077
2078         /*
2079          * Set the read-only status based on the supported commands
2080          * and the write protect switch.
2081          */
2082         md->read_only = mmc_blk_readonly(card);
2083
2084         md->disk = alloc_disk(perdev_minors);
2085         if (md->disk == NULL) {
2086                 ret = -ENOMEM;
2087                 goto err_kfree;
2088         }
2089
2090         spin_lock_init(&md->lock);
2091         INIT_LIST_HEAD(&md->part);
2092         md->usage = 1;
2093
2094         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2095         if (ret)
2096                 goto err_putdisk;
2097
2098         md->queue.issue_fn = mmc_blk_issue_rq;
2099         md->queue.data = md;
2100
2101         md->disk->major = MMC_BLOCK_MAJOR;
2102         md->disk->first_minor = devidx * perdev_minors;
2103         md->disk->fops = &mmc_bdops;
2104         md->disk->private_data = md;
2105         md->disk->queue = md->queue.queue;
2106         md->disk->driverfs_dev = parent;
2107         set_disk_ro(md->disk, md->read_only || default_ro);
2108         if (area_type & MMC_BLK_DATA_AREA_RPMB)
2109                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2110
2111         /*
2112          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2113          *
2114          * - be set for removable media with permanent block devices
2115          * - be unset for removable block devices with permanent media
2116          *
2117          * Since MMC block devices clearly fall under the second
2118          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2119          * should use the block device creation/destruction hotplug
2120          * messages to tell when the card is present.
2121          */
2122
2123         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2124                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2125
2126         if (mmc_card_mmc(card))
2127                 blk_queue_logical_block_size(md->queue.queue,
2128                                              card->ext_csd.data_sector_size);
2129         else
2130                 blk_queue_logical_block_size(md->queue.queue, 512);
2131
2132         set_capacity(md->disk, size);
2133
2134         if (mmc_host_cmd23(card->host)) {
2135                 if (mmc_card_mmc(card) ||
2136                     (mmc_card_sd(card) &&
2137                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2138                         md->flags |= MMC_BLK_CMD23;
2139         }
2140
2141         if (mmc_card_mmc(card) &&
2142             md->flags & MMC_BLK_CMD23 &&
2143             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2144              card->ext_csd.rel_sectors)) {
2145                 md->flags |= MMC_BLK_REL_WR;
2146                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2147         }
2148
2149         if (mmc_card_mmc(card) &&
2150             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2151             (md->flags & MMC_BLK_CMD23) &&
2152             card->ext_csd.packed_event_en) {
2153                 if (!mmc_packed_init(&md->queue, card))
2154                         md->flags |= MMC_BLK_PACKED_CMD;
2155         }
2156
2157         return md;
2158
2159  err_putdisk:
2160         put_disk(md->disk);
2161  err_kfree:
2162         kfree(md);
2163  out:
2164         return ERR_PTR(ret);
2165 }
2166
2167 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2168 {
2169         sector_t size;
2170         struct mmc_blk_data *md;
2171
2172         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2173                 /*
2174                  * The EXT_CSD sector count is in number or 512 byte
2175                  * sectors.
2176                  */
2177                 size = card->ext_csd.sectors;
2178         } else {
2179                 /*
2180                  * The CSD capacity field is in units of read_blkbits.
2181                  * set_capacity takes units of 512 bytes.
2182                  */
2183                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2184         }
2185
2186         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2187                                         MMC_BLK_DATA_AREA_MAIN);
2188         return md;
2189 }
2190
2191 static int mmc_blk_alloc_part(struct mmc_card *card,
2192                               struct mmc_blk_data *md,
2193                               unsigned int part_type,
2194                               sector_t size,
2195                               bool default_ro,
2196                               const char *subname,
2197                               int area_type)
2198 {
2199         char cap_str[10];
2200         struct mmc_blk_data *part_md;
2201
2202         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2203                                     subname, area_type);
2204         if (IS_ERR(part_md))
2205                 return PTR_ERR(part_md);
2206         part_md->part_type = part_type;
2207         list_add(&part_md->part, &md->part);
2208
2209         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2210                         cap_str, sizeof(cap_str));
2211         pr_info("%s: %s %s partition %u %s\n",
2212                part_md->disk->disk_name, mmc_card_id(card),
2213                mmc_card_name(card), part_md->part_type, cap_str);
2214         return 0;
2215 }
2216
2217 /* MMC Physical partitions consist of two boot partitions and
2218  * up to four general purpose partitions.
2219  * For each partition enabled in EXT_CSD a block device will be allocatedi
2220  * to provide access to the partition.
2221  */
2222
2223 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2224 {
2225         int idx, ret = 0;
2226
2227         if (!mmc_card_mmc(card))
2228                 return 0;
2229
2230         for (idx = 0; idx < card->nr_parts; idx++) {
2231                 if (card->part[idx].size) {
2232                         ret = mmc_blk_alloc_part(card, md,
2233                                 card->part[idx].part_cfg,
2234                                 card->part[idx].size >> 9,
2235                                 card->part[idx].force_ro,
2236                                 card->part[idx].name,
2237                                 card->part[idx].area_type);
2238                         if (ret)
2239                                 return ret;
2240                 }
2241         }
2242
2243         return ret;
2244 }
2245
2246 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2247 {
2248         struct mmc_card *card;
2249
2250         if (md) {
2251                 /*
2252                  * Flush remaining requests and free queues. It
2253                  * is freeing the queue that stops new requests
2254                  * from being accepted.
2255                  */
2256                 card = md->queue.card;
2257                 mmc_cleanup_queue(&md->queue);
2258                 if (md->flags & MMC_BLK_PACKED_CMD)
2259                         mmc_packed_clean(&md->queue);
2260                 if (md->disk->flags & GENHD_FL_UP) {
2261                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2262                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2263                                         card->ext_csd.boot_ro_lockable)
2264                                 device_remove_file(disk_to_dev(md->disk),
2265                                         &md->power_ro_lock);
2266
2267                         del_gendisk(md->disk);
2268                 }
2269                 mmc_blk_put(md);
2270         }
2271 }
2272
2273 static void mmc_blk_remove_parts(struct mmc_card *card,
2274                                  struct mmc_blk_data *md)
2275 {
2276         struct list_head *pos, *q;
2277         struct mmc_blk_data *part_md;
2278
2279         __clear_bit(md->name_idx, name_use);
2280         list_for_each_safe(pos, q, &md->part) {
2281                 part_md = list_entry(pos, struct mmc_blk_data, part);
2282                 list_del(pos);
2283                 mmc_blk_remove_req(part_md);
2284         }
2285 }
2286
2287 static int mmc_add_disk(struct mmc_blk_data *md)
2288 {
2289         int ret;
2290         struct mmc_card *card = md->queue.card;
2291
2292         add_disk(md->disk);
2293         md->force_ro.show = force_ro_show;
2294         md->force_ro.store = force_ro_store;
2295         sysfs_attr_init(&md->force_ro.attr);
2296         md->force_ro.attr.name = "force_ro";
2297         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2298         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2299         if (ret)
2300                 goto force_ro_fail;
2301
2302         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2303              card->ext_csd.boot_ro_lockable) {
2304                 umode_t mode;
2305
2306                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2307                         mode = S_IRUGO;
2308                 else
2309                         mode = S_IRUGO | S_IWUSR;
2310
2311                 md->power_ro_lock.show = power_ro_lock_show;
2312                 md->power_ro_lock.store = power_ro_lock_store;
2313                 sysfs_attr_init(&md->power_ro_lock.attr);
2314                 md->power_ro_lock.attr.mode = mode;
2315                 md->power_ro_lock.attr.name =
2316                                         "ro_lock_until_next_power_on";
2317                 ret = device_create_file(disk_to_dev(md->disk),
2318                                 &md->power_ro_lock);
2319                 if (ret)
2320                         goto power_ro_lock_fail;
2321         }
2322         return ret;
2323
2324 power_ro_lock_fail:
2325         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2326 force_ro_fail:
2327         del_gendisk(md->disk);
2328
2329         return ret;
2330 }
2331
2332 #define CID_MANFID_SANDISK      0x2
2333 #define CID_MANFID_TOSHIBA      0x11
2334 #define CID_MANFID_MICRON       0x13
2335 #define CID_MANFID_SAMSUNG      0x15
2336
2337 static const struct mmc_fixup blk_fixups[] =
2338 {
2339         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2340                   MMC_QUIRK_INAND_CMD38),
2341         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2342                   MMC_QUIRK_INAND_CMD38),
2343         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2344                   MMC_QUIRK_INAND_CMD38),
2345         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2346                   MMC_QUIRK_INAND_CMD38),
2347         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2348                   MMC_QUIRK_INAND_CMD38),
2349
2350         /*
2351          * Some MMC cards experience performance degradation with CMD23
2352          * instead of CMD12-bounded multiblock transfers. For now we'll
2353          * black list what's bad...
2354          * - Certain Toshiba cards.
2355          *
2356          * N.B. This doesn't affect SD cards.
2357          */
2358         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2359                   MMC_QUIRK_BLK_NO_CMD23),
2360         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2361                   MMC_QUIRK_BLK_NO_CMD23),
2362         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2363                   MMC_QUIRK_BLK_NO_CMD23),
2364
2365         /*
2366          * Some Micron MMC cards needs longer data read timeout than
2367          * indicated in CSD.
2368          */
2369         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2370                   MMC_QUIRK_LONG_READ_TIME),
2371
2372         /*
2373          * On these Samsung MoviNAND parts, performing secure erase or
2374          * secure trim can result in unrecoverable corruption due to a
2375          * firmware bug.
2376          */
2377         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2378                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2379         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2380                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2381         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2382                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2383         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2384                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2385         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2386                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2387         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2388                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2389         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2390                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2391         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2392                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2393
2394         END_FIXUP
2395 };
2396
2397 static int mmc_blk_probe(struct mmc_card *card)
2398 {
2399         struct mmc_blk_data *md, *part_md;
2400         char cap_str[10];
2401
2402         /*
2403          * Check that the card supports the command class(es) we need.
2404          */
2405         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2406                 return -ENODEV;
2407
2408         md = mmc_blk_alloc(card);
2409         if (IS_ERR(md))
2410                 return PTR_ERR(md);
2411
2412         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2413                         cap_str, sizeof(cap_str));
2414         pr_info("%s: %s %s %s %s\n",
2415                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2416                 cap_str, md->read_only ? "(ro)" : "");
2417
2418         if (mmc_blk_alloc_parts(card, md))
2419                 goto out;
2420
2421         mmc_set_drvdata(card, md);
2422         mmc_fixup_device(card, blk_fixups);
2423
2424         if (mmc_add_disk(md))
2425                 goto out;
2426
2427         list_for_each_entry(part_md, &md->part, part) {
2428                 if (mmc_add_disk(part_md))
2429                         goto out;
2430         }
2431
2432         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2433         pm_runtime_use_autosuspend(&card->dev);
2434
2435         /*
2436          * Don't enable runtime PM for SD-combo cards here. Leave that
2437          * decision to be taken during the SDIO init sequence instead.
2438          */
2439         if (card->type != MMC_TYPE_SD_COMBO) {
2440                 pm_runtime_set_active(&card->dev);
2441                 pm_runtime_enable(&card->dev);
2442         }
2443
2444         return 0;
2445
2446  out:
2447         mmc_blk_remove_parts(card, md);
2448         mmc_blk_remove_req(md);
2449         return 0;
2450 }
2451
2452 static void mmc_blk_remove(struct mmc_card *card)
2453 {
2454         struct mmc_blk_data *md = mmc_get_drvdata(card);
2455
2456         mmc_blk_remove_parts(card, md);
2457         pm_runtime_get_sync(&card->dev);
2458         mmc_claim_host(card->host);
2459         mmc_blk_part_switch(card, md);
2460         mmc_release_host(card->host);
2461         if (card->type != MMC_TYPE_SD_COMBO)
2462                 pm_runtime_disable(&card->dev);
2463         pm_runtime_put_noidle(&card->dev);
2464         mmc_blk_remove_req(md);
2465         mmc_set_drvdata(card, NULL);
2466 }
2467
2468 static int _mmc_blk_suspend(struct mmc_card *card)
2469 {
2470         struct mmc_blk_data *part_md;
2471         struct mmc_blk_data *md = mmc_get_drvdata(card);
2472
2473         if (md) {
2474                 mmc_queue_suspend(&md->queue);
2475                 list_for_each_entry(part_md, &md->part, part) {
2476                         mmc_queue_suspend(&part_md->queue);
2477                 }
2478         }
2479         return 0;
2480 }
2481
2482 static void mmc_blk_shutdown(struct mmc_card *card)
2483 {
2484         _mmc_blk_suspend(card);
2485 }
2486
2487 #ifdef CONFIG_PM
2488 static int mmc_blk_suspend(struct mmc_card *card)
2489 {
2490         return _mmc_blk_suspend(card);
2491 }
2492
2493 static int mmc_blk_resume(struct mmc_card *card)
2494 {
2495         struct mmc_blk_data *part_md;
2496         struct mmc_blk_data *md = mmc_get_drvdata(card);
2497
2498         if (md) {
2499                 /*
2500                  * Resume involves the card going into idle state,
2501                  * so current partition is always the main one.
2502                  */
2503                 md->part_curr = md->part_type;
2504                 mmc_queue_resume(&md->queue);
2505                 list_for_each_entry(part_md, &md->part, part) {
2506                         mmc_queue_resume(&part_md->queue);
2507                 }
2508         }
2509         return 0;
2510 }
2511 #else
2512 #define mmc_blk_suspend NULL
2513 #define mmc_blk_resume  NULL
2514 #endif
2515
2516 static struct mmc_driver mmc_driver = {
2517         .drv            = {
2518                 .name   = "mmcblk",
2519         },
2520         .probe          = mmc_blk_probe,
2521         .remove         = mmc_blk_remove,
2522         .suspend        = mmc_blk_suspend,
2523         .resume         = mmc_blk_resume,
2524         .shutdown       = mmc_blk_shutdown,
2525 };
2526
2527 static int __init mmc_blk_init(void)
2528 {
2529         int res;
2530
2531         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2532                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2533
2534         max_devices = 256 / perdev_minors;
2535
2536         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2537         if (res)
2538                 goto out;
2539
2540         res = mmc_register_driver(&mmc_driver);
2541         if (res)
2542                 goto out2;
2543
2544         return 0;
2545  out2:
2546         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2547  out:
2548         return res;
2549 }
2550
2551 static void __exit mmc_blk_exit(void)
2552 {
2553         mmc_unregister_driver(&mmc_driver);
2554         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2555 }
2556
2557 module_init(mmc_blk_init);
2558 module_exit(mmc_blk_exit);
2559
2560 MODULE_LICENSE("GPL");
2561 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2562