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 dev_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\n",
 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 = dev_get_drvdata(&card->dev);
 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 get_card_status(struct mmc_card *card, u32 *status, int retries)
 725 {
 726         struct mmc_command cmd = {0};
 727         int err;
 728
 729         cmd.opcode = MMC_SEND_STATUS;
 730         if (!mmc_host_is_spi(card->host))
 731                 cmd.arg = card->rca << 16;
 732         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 733         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 734         if (err == 0)
 735                 *status = cmd.resp[0];
 736         return err;
 737 }
 738
 739 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 740                 bool hw_busy_detect, struct request *req, int *gen_err)
 741 {
 742         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 743         int err = 0;
 744         u32 status;
 745
 746         do {
 747                 err = get_card_status(card, &status, 5);
 748                 if (err) {
 749                         pr_err("%s: error %d requesting status\n",
 750                                req->rq_disk->disk_name, err);
 751                         return err;
 752                 }
 753
 754                 if (status & R1_ERROR) {
 755                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 756                                 req->rq_disk->disk_name, __func__, status);
 757                         *gen_err = 1;
 758                 }
 759
 760                 /* We may rely on the host hw to handle busy detection.*/
 761                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 762                         hw_busy_detect)
 763                         break;
 764
 765                 /*
 766                  * Timeout if the device never becomes ready for data and never
 767                  * leaves the program state.
 768                  */
 769                 if (time_after(jiffies, timeout)) {
 770                         pr_err("%s: Card stuck in programming state! %s %s\n",
 771                                 mmc_hostname(card->host),
 772                                 req->rq_disk->disk_name, __func__);
 773                         return -ETIMEDOUT;
 774                 }
 775
 776                 /*
 777                  * Some cards mishandle the status bits,
 778                  * so make sure to check both the busy
 779                  * indication and the card state.
 780                  */
 781         } while (!(status & R1_READY_FOR_DATA) ||
 782                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 783
 784         return err;
 785 }
 786
 787 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 788                 struct request *req, int *gen_err, u32 *stop_status)
 789 {
 790         struct mmc_host *host = card->host;
 791         struct mmc_command cmd = {0};
 792         int err;
 793         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 794
 795         /*
 796          * Normally we use R1B responses for WRITE, but in cases where the host
 797          * has specified a max_busy_timeout we need to validate it. A failure
 798          * means we need to prevent the host from doing hw busy detection, which
 799          * is done by converting to a R1 response instead.
 800          */
 801         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 802                 use_r1b_resp = false;
 803
 804         cmd.opcode = MMC_STOP_TRANSMISSION;
 805         if (use_r1b_resp) {
 806                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 807                 cmd.busy_timeout = timeout_ms;
 808         } else {
 809                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 810         }
 811
 812         err = mmc_wait_for_cmd(host, &cmd, 5);
 813         if (err)
 814                 return err;
 815
 816         *stop_status = cmd.resp[0];
 817
 818         /* No need to check card status in case of READ. */
 819         if (rq_data_dir(req) == READ)
 820                 return 0;
 821
 822         if (!mmc_host_is_spi(host) &&
 823                 (*stop_status & R1_ERROR)) {
 824                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 825                         req->rq_disk->disk_name, __func__, *stop_status);
 826                 *gen_err = 1;
 827         }
 828
 829         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 830 }
 831
 832 #define ERR_NOMEDIUM    3
 833 #define ERR_RETRY       2
 834 #define ERR_ABORT       1
 835 #define ERR_CONTINUE    0
 836
 837 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 838         bool status_valid, u32 status)
 839 {
 840         switch (error) {
 841         case -EILSEQ:
 842                 /* response crc error, retry the r/w cmd */
 843                 pr_err("%s: %s sending %s command, card status %#x\n",
 844                         req->rq_disk->disk_name, "response CRC error",
 845                         name, status);
 846                 return ERR_RETRY;
 847
 848         case -ETIMEDOUT:
 849                 pr_err("%s: %s sending %s command, card status %#x\n",
 850                         req->rq_disk->disk_name, "timed out", name, status);
 851
 852                 /* If the status cmd initially failed, retry the r/w cmd */
 853                 if (!status_valid)
 854                         return ERR_RETRY;
 855
 856                 /*
 857                  * If it was a r/w cmd crc error, or illegal command
 858                  * (eg, issued in wrong state) then retry - we should
 859                  * have corrected the state problem above.
 860                  */
 861                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 862                         return ERR_RETRY;
 863
 864                 /* Otherwise abort the command */
 865                 return ERR_ABORT;
 866
 867         default:
 868                 /* We don't understand the error code the driver gave us */
 869                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 870                        req->rq_disk->disk_name, error, status);
 871                 return ERR_ABORT;
 872         }
 873 }
 874
 875 /*
 876  * Initial r/w and stop cmd error recovery.
 877  * We don't know whether the card received the r/w cmd or not, so try to
 878  * restore things back to a sane state.  Essentially, we do this as follows:
 879  * - Obtain card status.  If the first attempt to obtain card status fails,
 880  *   the status word will reflect the failed status cmd, not the failed
 881  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 882  *   longer communicate with the card.
 883  * - Check the card state.  If the card received the cmd but there was a
 884  *   transient problem with the response, it might still be in a data transfer
 885  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 886  * - If the r/w cmd failed due to a response CRC error, it was probably
 887  *   transient, so retry the cmd.
 888  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 889  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 890  *   illegal cmd, retry.
 891  * Otherwise we don't understand what happened, so abort.
 892  */
 893 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 894         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 895 {
 896         bool prev_cmd_status_valid = true;
 897         u32 status, stop_status = 0;
 898         int err, retry;
 899
 900         if (mmc_card_removed(card))
 901                 return ERR_NOMEDIUM;
 902
 903         /*
 904          * Try to get card status which indicates both the card state
 905          * and why there was no response.  If the first attempt fails,
 906          * we can't be sure the returned status is for the r/w command.
 907          */
 908         for (retry = 2; retry >= 0; retry--) {
 909                 err = get_card_status(card, &status, 0);
 910                 if (!err)
 911                         break;
 912
 913                 prev_cmd_status_valid = false;
 914                 pr_err("%s: error %d sending status command, %sing\n",
 915                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 916         }
 917
 918         /* We couldn't get a response from the card.  Give up. */
 919         if (err) {
 920                 /* Check if the card is removed */
 921                 if (mmc_detect_card_removed(card->host))
 922                         return ERR_NOMEDIUM;
 923                 return ERR_ABORT;
 924         }
 925
 926         /* Flag ECC errors */
 927         if ((status & R1_CARD_ECC_FAILED) ||
 928             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 929             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 930                 *ecc_err = 1;
 931
 932         /* Flag General errors */
 933         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 934                 if ((status & R1_ERROR) ||
 935                         (brq->stop.resp[0] & R1_ERROR)) {
 936                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 937                                req->rq_disk->disk_name, __func__,
 938                                brq->stop.resp[0], status);
 939                         *gen_err = 1;
 940                 }
 941
 942         /*
 943          * Check the current card state.  If it is in some data transfer
 944          * mode, tell it to stop (and hopefully transition back to TRAN.)
 945          */
 946         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 947             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 948                 err = send_stop(card,
 949                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
 950                         req, gen_err, &stop_status);
 951                 if (err) {
 952                         pr_err("%s: error %d sending stop command\n",
 953                                req->rq_disk->disk_name, err);
 954                         /*
 955                          * If the stop cmd also timed out, the card is probably
 956                          * not present, so abort. Other errors are bad news too.
 957                          */
 958                         return ERR_ABORT;
 959                 }
 960
 961                 if (stop_status & R1_CARD_ECC_FAILED)
 962                         *ecc_err = 1;
 963         }
 964
 965         /* Check for set block count errors */
 966         if (brq->sbc.error)
 967                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 968                                 prev_cmd_status_valid, status);
 969
 970         /* Check for r/w command errors */
 971         if (brq->cmd.error)
 972                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 973                                 prev_cmd_status_valid, status);
 974
 975         /* Data errors */
 976         if (!brq->stop.error)
 977                 return ERR_CONTINUE;
 978
 979         /* Now for stop errors.  These aren't fatal to the transfer. */
 980         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 981                req->rq_disk->disk_name, brq->stop.error,
 982                brq->cmd.resp[0], status);
 983
 984         /*
 985          * Subsitute in our own stop status as this will give the error
 986          * state which happened during the execution of the r/w command.
 987          */
 988         if (stop_status) {
 989                 brq->stop.resp[0] = stop_status;
 990                 brq->stop.error = 0;
 991         }
 992         return ERR_CONTINUE;
 993 }
 994
 995 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 996                          int type)
 997 {
 998         int err;
 999
1000         if (md->reset_done & type)
1001                 return -EEXIST;
1002
1003         md->reset_done |= type;
1004         err = mmc_hw_reset(host);
1005         /* Ensure we switch back to the correct partition */
1006         if (err != -EOPNOTSUPP) {
1007                 struct mmc_blk_data *main_md =
1008                         dev_get_drvdata(&host->card->dev);
1009                 int part_err;
1010
1011                 main_md->part_curr = main_md->part_type;
1012                 part_err = mmc_blk_part_switch(host->card, md);
1013                 if (part_err) {
1014                         /*
1015                          * We have failed to get back into the correct
1016                          * partition, so we need to abort the whole request.
1017                          */
1018                         return -ENODEV;
1019                 }
1020         }
1021         return err;
1022 }
1023
1024 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1025 {
1026         md->reset_done &= ~type;
1027 }
1028
1029 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1030 {
1031         struct mmc_blk_data *md = mq->data;
1032         struct mmc_card *card = md->queue.card;
1033         unsigned int from, nr, arg;
1034         int err = 0, type = MMC_BLK_DISCARD;
1035
1036         if (!mmc_can_erase(card)) {
1037                 err = -EOPNOTSUPP;
1038                 goto out;
1039         }
1040
1041         from = blk_rq_pos(req);
1042         nr = blk_rq_sectors(req);
1043
1044         if (mmc_can_discard(card))
1045                 arg = MMC_DISCARD_ARG;
1046         else if (mmc_can_trim(card))
1047                 arg = MMC_TRIM_ARG;
1048         else
1049                 arg = MMC_ERASE_ARG;
1050 retry:
1051         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1052                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1053                                  INAND_CMD38_ARG_EXT_CSD,
1054                                  arg == MMC_TRIM_ARG ?
1055                                  INAND_CMD38_ARG_TRIM :
1056                                  INAND_CMD38_ARG_ERASE,
1057                                  0);
1058                 if (err)
1059                         goto out;
1060         }
1061         err = mmc_erase(card, from, nr, arg);
1062 out:
1063         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1064                 goto retry;
1065         if (!err)
1066                 mmc_blk_reset_success(md, type);
1067         blk_end_request(req, err, blk_rq_bytes(req));
1068
1069         return err ? 0 : 1;
1070 }
1071
1072 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1073                                        struct request *req)
1074 {
1075         struct mmc_blk_data *md = mq->data;
1076         struct mmc_card *card = md->queue.card;
1077         unsigned int from, nr, arg;
1078         int err = 0, type = MMC_BLK_SECDISCARD;
1079
1080         if (!(mmc_can_secure_erase_trim(card))) {
1081                 err = -EOPNOTSUPP;
1082                 goto out;
1083         }
1084
1085         from = blk_rq_pos(req);
1086         nr = blk_rq_sectors(req);
1087
1088         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1089                 arg = MMC_SECURE_TRIM1_ARG;
1090         else
1091                 arg = MMC_SECURE_ERASE_ARG;
1092
1093 retry:
1094         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1095                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1096                                  INAND_CMD38_ARG_EXT_CSD,
1097                                  arg == MMC_SECURE_TRIM1_ARG ?
1098                                  INAND_CMD38_ARG_SECTRIM1 :
1099                                  INAND_CMD38_ARG_SECERASE,
1100                                  0);
1101                 if (err)
1102                         goto out_retry;
1103         }
1104
1105         err = mmc_erase(card, from, nr, arg);
1106         if (err == -EIO)
1107                 goto out_retry;
1108         if (err)
1109                 goto out;
1110
1111         if (arg == MMC_SECURE_TRIM1_ARG) {
1112                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1113                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1114                                          INAND_CMD38_ARG_EXT_CSD,
1115                                          INAND_CMD38_ARG_SECTRIM2,
1116                                          0);
1117                         if (err)
1118                                 goto out_retry;
1119                 }
1120
1121                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1122                 if (err == -EIO)
1123                         goto out_retry;
1124                 if (err)
1125                         goto out;
1126         }
1127
1128 out_retry:
1129         if (err && !mmc_blk_reset(md, card->host, type))
1130                 goto retry;
1131         if (!err)
1132                 mmc_blk_reset_success(md, type);
1133 out:
1134         blk_end_request(req, err, blk_rq_bytes(req));
1135
1136         return err ? 0 : 1;
1137 }
1138
1139 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1140 {
1141         struct mmc_blk_data *md = mq->data;
1142         struct mmc_card *card = md->queue.card;
1143         int ret = 0;
1144
1145         ret = mmc_flush_cache(card);
1146         if (ret)
1147                 ret = -EIO;
1148
1149         blk_end_request_all(req, ret);
1150
1151         return ret ? 0 : 1;
1152 }
1153
1154 /*
1155  * Reformat current write as a reliable write, supporting
1156  * both legacy and the enhanced reliable write MMC cards.
1157  * In each transfer we'll handle only as much as a single
1158  * reliable write can handle, thus finish the request in
1159  * partial completions.
1160  */
1161 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1162                                     struct mmc_card *card,
1163                                     struct request *req)
1164 {
1165         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1166                 /* Legacy mode imposes restrictions on transfers. */
1167                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1168                         brq->data.blocks = 1;
1169
1170                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1171                         brq->data.blocks = card->ext_csd.rel_sectors;
1172                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1173                         brq->data.blocks = 1;
1174         }
1175 }
1176
1177 #define CMD_ERRORS                                                      \
1178         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1179          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1180          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1181          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1182          R1_CC_ERROR |          /* Card controller error */             \
1183          R1_ERROR)              /* General/unknown error */
1184
1185 static int mmc_blk_err_check(struct mmc_card *card,
1186                              struct mmc_async_req *areq)
1187 {
1188         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1189                                                     mmc_active);
1190         struct mmc_blk_request *brq = &mq_mrq->brq;
1191         struct request *req = mq_mrq->req;
1192         int ecc_err = 0, gen_err = 0;
1193
1194         /*
1195          * sbc.error indicates a problem with the set block count
1196          * command.  No data will have been transferred.
1197          *
1198          * cmd.error indicates a problem with the r/w command.  No
1199          * data will have been transferred.
1200          *
1201          * stop.error indicates a problem with the stop command.  Data
1202          * may have been transferred, or may still be transferring.
1203          */
1204         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1205             brq->data.error) {
1206                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1207                 case ERR_RETRY:
1208                         return MMC_BLK_RETRY;
1209                 case ERR_ABORT:
1210                         return MMC_BLK_ABORT;
1211                 case ERR_NOMEDIUM:
1212                         return MMC_BLK_NOMEDIUM;
1213                 case ERR_CONTINUE:
1214                         break;
1215                 }
1216         }
1217
1218         /*
1219          * Check for errors relating to the execution of the
1220          * initial command - such as address errors.  No data
1221          * has been transferred.
1222          */
1223         if (brq->cmd.resp[0] & CMD_ERRORS) {
1224                 pr_err("%s: r/w command failed, status = %#x\n",
1225                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1226                 return MMC_BLK_ABORT;
1227         }
1228
1229         /*
1230          * Everything else is either success, or a data error of some
1231          * kind.  If it was a write, we may have transitioned to
1232          * program mode, which we have to wait for it to complete.
1233          */
1234         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1235                 int err;
1236
1237                 /* Check stop command response */
1238                 if (brq->stop.resp[0] & R1_ERROR) {
1239                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1240                                req->rq_disk->disk_name, __func__,
1241                                brq->stop.resp[0]);
1242                         gen_err = 1;
1243                 }
1244
1245                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1246                                         &gen_err);
1247                 if (err)
1248                         return MMC_BLK_CMD_ERR;
1249         }
1250
1251         /* if general error occurs, retry the write operation. */
1252         if (gen_err) {
1253                 pr_warn("%s: retrying write for general error\n",
1254                                 req->rq_disk->disk_name);
1255                 return MMC_BLK_RETRY;
1256         }
1257
1258         if (brq->data.error) {
1259                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1260                        req->rq_disk->disk_name, brq->data.error,
1261                        (unsigned)blk_rq_pos(req),
1262                        (unsigned)blk_rq_sectors(req),
1263                        brq->cmd.resp[0], brq->stop.resp[0]);
1264
1265                 if (rq_data_dir(req) == READ) {
1266                         if (ecc_err)
1267                                 return MMC_BLK_ECC_ERR;
1268                         return MMC_BLK_DATA_ERR;
1269                 } else {
1270                         return MMC_BLK_CMD_ERR;
1271                 }
1272         }
1273
1274         if (!brq->data.bytes_xfered)
1275                 return MMC_BLK_RETRY;
1276
1277         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1278                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1279                         return MMC_BLK_PARTIAL;
1280                 else
1281                         return MMC_BLK_SUCCESS;
1282         }
1283
1284         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1285                 return MMC_BLK_PARTIAL;
1286
1287         return MMC_BLK_SUCCESS;
1288 }
1289
1290 static int mmc_blk_packed_err_check(struct mmc_card *card,
1291                                     struct mmc_async_req *areq)
1292 {
1293         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1294                         mmc_active);
1295         struct request *req = mq_rq->req;
1296         struct mmc_packed *packed = mq_rq->packed;
1297         int err, check, status;
1298         u8 *ext_csd;
1299
1300         BUG_ON(!packed);
1301
1302         packed->retries--;
1303         check = mmc_blk_err_check(card, areq);
1304         err = get_card_status(card, &status, 0);
1305         if (err) {
1306                 pr_err("%s: error %d sending status command\n",
1307                        req->rq_disk->disk_name, err);
1308                 return MMC_BLK_ABORT;
1309         }
1310
1311         if (status & R1_EXCEPTION_EVENT) {
1312                 ext_csd = kzalloc(512, GFP_KERNEL);
1313                 if (!ext_csd) {
1314                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1315                                req->rq_disk->disk_name);
1316                         return -ENOMEM;
1317                 }
1318
1319                 err = mmc_send_ext_csd(card, ext_csd);
1320                 if (err) {
1321                         pr_err("%s: error %d sending ext_csd\n",
1322                                req->rq_disk->disk_name, err);
1323                         check = MMC_BLK_ABORT;
1324                         goto free;
1325                 }
1326
1327                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1328                      EXT_CSD_PACKED_FAILURE) &&
1329                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1330                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1331                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1332                             EXT_CSD_PACKED_INDEXED_ERROR) {
1333                                 packed->idx_failure =
1334                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1335                                 check = MMC_BLK_PARTIAL;
1336                         }
1337                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1338                                "failure index: %d\n",
1339                                req->rq_disk->disk_name, packed->nr_entries,
1340                                packed->blocks, packed->idx_failure);
1341                 }
1342 free:
1343                 kfree(ext_csd);
1344         }
1345
1346         return check;
1347 }
1348
1349 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1350                                struct mmc_card *card,
1351                                int disable_multi,
1352                                struct mmc_queue *mq)
1353 {
1354         u32 readcmd, writecmd;
1355         struct mmc_blk_request *brq = &mqrq->brq;
1356         struct request *req = mqrq->req;
1357         struct mmc_blk_data *md = mq->data;
1358         bool do_data_tag;
1359
1360         /*
1361          * Reliable writes are used to implement Forced Unit Access and
1362          * REQ_META accesses, and are supported only on MMCs.
1363          *
1364          * XXX: this really needs a good explanation of why REQ_META
1365          * is treated special.
1366          */
1367         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1368                           (req->cmd_flags & REQ_META)) &&
1369                 (rq_data_dir(req) == WRITE) &&
1370                 (md->flags & MMC_BLK_REL_WR);
1371
1372         memset(brq, 0, sizeof(struct mmc_blk_request));
1373         brq->mrq.cmd = &brq->cmd;
1374         brq->mrq.data = &brq->data;
1375
1376         brq->cmd.arg = blk_rq_pos(req);
1377         if (!mmc_card_blockaddr(card))
1378                 brq->cmd.arg <<= 9;
1379         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1380         brq->data.blksz = 512;
1381         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1382         brq->stop.arg = 0;
1383         brq->data.blocks = blk_rq_sectors(req);
1384
1385         /*
1386          * The block layer doesn't support all sector count
1387          * restrictions, so we need to be prepared for too big
1388          * requests.
1389          */
1390         if (brq->data.blocks > card->host->max_blk_count)
1391                 brq->data.blocks = card->host->max_blk_count;
1392
1393         if (brq->data.blocks > 1) {
1394                 /*
1395                  * After a read error, we redo the request one sector
1396                  * at a time in order to accurately determine which
1397                  * sectors can be read successfully.
1398                  */
1399                 if (disable_multi)
1400                         brq->data.blocks = 1;
1401
1402                 /*
1403                  * Some controllers have HW issues while operating
1404                  * in multiple I/O mode
1405                  */
1406                 if (card->host->ops->multi_io_quirk)
1407                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1408                                                 (rq_data_dir(req) == READ) ?
1409                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1410                                                 brq->data.blocks);
1411         }
1412
1413         if (brq->data.blocks > 1 || do_rel_wr) {
1414                 /* SPI multiblock writes terminate using a special
1415                  * token, not a STOP_TRANSMISSION request.
1416                  */
1417                 if (!mmc_host_is_spi(card->host) ||
1418                     rq_data_dir(req) == READ)
1419                         brq->mrq.stop = &brq->stop;
1420                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1421                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1422         } else {
1423                 brq->mrq.stop = NULL;
1424                 readcmd = MMC_READ_SINGLE_BLOCK;
1425                 writecmd = MMC_WRITE_BLOCK;
1426         }
1427         if (rq_data_dir(req) == READ) {
1428                 brq->cmd.opcode = readcmd;
1429                 brq->data.flags |= MMC_DATA_READ;
1430                 if (brq->mrq.stop)
1431                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1432                                         MMC_CMD_AC;
1433         } else {
1434                 brq->cmd.opcode = writecmd;
1435                 brq->data.flags |= MMC_DATA_WRITE;
1436                 if (brq->mrq.stop)
1437                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1438                                         MMC_CMD_AC;
1439         }
1440
1441         if (do_rel_wr)
1442                 mmc_apply_rel_rw(brq, card, req);
1443
1444         /*
1445          * Data tag is used only during writing meta data to speed
1446          * up write and any subsequent read of this meta data
1447          */
1448         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1449                 (req->cmd_flags & REQ_META) &&
1450                 (rq_data_dir(req) == WRITE) &&
1451                 ((brq->data.blocks * brq->data.blksz) >=
1452                  card->ext_csd.data_tag_unit_size);
1453
1454         /*
1455          * Pre-defined multi-block transfers are preferable to
1456          * open ended-ones (and necessary for reliable writes).
1457          * However, it is not sufficient to just send CMD23,
1458          * and avoid the final CMD12, as on an error condition
1459          * CMD12 (stop) needs to be sent anyway. This, coupled
1460          * with Auto-CMD23 enhancements provided by some
1461          * hosts, means that the complexity of dealing
1462          * with this is best left to the host. If CMD23 is
1463          * supported by card and host, we'll fill sbc in and let
1464          * the host deal with handling it correctly. This means
1465          * that for hosts that don't expose MMC_CAP_CMD23, no
1466          * change of behavior will be observed.
1467          *
1468          * N.B: Some MMC cards experience perf degradation.
1469          * We'll avoid using CMD23-bounded multiblock writes for
1470          * these, while retaining features like reliable writes.
1471          */
1472         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1473             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1474              do_data_tag)) {
1475                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1476                 brq->sbc.arg = brq->data.blocks |
1477                         (do_rel_wr ? (1 << 31) : 0) |
1478                         (do_data_tag ? (1 << 29) : 0);
1479                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1480                 brq->mrq.sbc = &brq->sbc;
1481         }
1482
1483         mmc_set_data_timeout(&brq->data, card);
1484
1485         brq->data.sg = mqrq->sg;
1486         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1487
1488         /*
1489          * Adjust the sg list so it is the same size as the
1490          * request.
1491          */
1492         if (brq->data.blocks != blk_rq_sectors(req)) {
1493                 int i, data_size = brq->data.blocks << 9;
1494                 struct scatterlist *sg;
1495
1496                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1497                         data_size -= sg->length;
1498                         if (data_size <= 0) {
1499                                 sg->length += data_size;
1500                                 i++;
1501                                 break;
1502                         }
1503                 }
1504                 brq->data.sg_len = i;
1505         }
1506
1507         mqrq->mmc_active.mrq = &brq->mrq;
1508         mqrq->mmc_active.err_check = mmc_blk_err_check;
1509
1510         mmc_queue_bounce_pre(mqrq);
1511 }
1512
1513 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1514                                           struct mmc_card *card)
1515 {
1516         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1517         unsigned int max_seg_sz = queue_max_segment_size(q);
1518         unsigned int len, nr_segs = 0;
1519
1520         do {
1521                 len = min(hdr_sz, max_seg_sz);
1522                 hdr_sz -= len;
1523                 nr_segs++;
1524         } while (hdr_sz);
1525
1526         return nr_segs;
1527 }
1528
1529 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1530 {
1531         struct request_queue *q = mq->queue;
1532         struct mmc_card *card = mq->card;
1533         struct request *cur = req, *next = NULL;
1534         struct mmc_blk_data *md = mq->data;
1535         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1536         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1537         unsigned int req_sectors = 0, phys_segments = 0;
1538         unsigned int max_blk_count, max_phys_segs;
1539         bool put_back = true;
1540         u8 max_packed_rw = 0;
1541         u8 reqs = 0;
1542
1543         if (!(md->flags & MMC_BLK_PACKED_CMD))
1544                 goto no_packed;
1545
1546         if ((rq_data_dir(cur) == WRITE) &&
1547             mmc_host_packed_wr(card->host))
1548                 max_packed_rw = card->ext_csd.max_packed_writes;
1549
1550         if (max_packed_rw == 0)
1551                 goto no_packed;
1552
1553         if (mmc_req_rel_wr(cur) &&
1554             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1555                 goto no_packed;
1556
1557         if (mmc_large_sector(card) &&
1558             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1559                 goto no_packed;
1560
1561         mmc_blk_clear_packed(mqrq);
1562
1563         max_blk_count = min(card->host->max_blk_count,
1564                             card->host->max_req_size >> 9);
1565         if (unlikely(max_blk_count > 0xffff))
1566                 max_blk_count = 0xffff;
1567
1568         max_phys_segs = queue_max_segments(q);
1569         req_sectors += blk_rq_sectors(cur);
1570         phys_segments += cur->nr_phys_segments;
1571
1572         if (rq_data_dir(cur) == WRITE) {
1573                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1574                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1575         }
1576
1577         do {
1578                 if (reqs >= max_packed_rw - 1) {
1579                         put_back = false;
1580                         break;
1581                 }
1582
1583                 spin_lock_irq(q->queue_lock);
1584                 next = blk_fetch_request(q);
1585                 spin_unlock_irq(q->queue_lock);
1586                 if (!next) {
1587                         put_back = false;
1588                         break;
1589                 }
1590
1591                 if (mmc_large_sector(card) &&
1592                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1593                         break;
1594
1595                 if (next->cmd_flags & REQ_DISCARD ||
1596                     next->cmd_flags & REQ_FLUSH)
1597                         break;
1598
1599                 if (rq_data_dir(cur) != rq_data_dir(next))
1600                         break;
1601
1602                 if (mmc_req_rel_wr(next) &&
1603                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1604                         break;
1605
1606                 req_sectors += blk_rq_sectors(next);
1607                 if (req_sectors > max_blk_count)
1608                         break;
1609
1610                 phys_segments +=  next->nr_phys_segments;
1611                 if (phys_segments > max_phys_segs)
1612                         break;
1613
1614                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1615                 cur = next;
1616                 reqs++;
1617         } while (1);
1618
1619         if (put_back) {
1620                 spin_lock_irq(q->queue_lock);
1621                 blk_requeue_request(q, next);
1622                 spin_unlock_irq(q->queue_lock);
1623         }
1624
1625         if (reqs > 0) {
1626                 list_add(&req->queuelist, &mqrq->packed->list);
1627                 mqrq->packed->nr_entries = ++reqs;
1628                 mqrq->packed->retries = reqs;
1629                 return reqs;
1630         }
1631
1632 no_packed:
1633         mqrq->cmd_type = MMC_PACKED_NONE;
1634         return 0;
1635 }
1636
1637 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1638                                         struct mmc_card *card,
1639                                         struct mmc_queue *mq)
1640 {
1641         struct mmc_blk_request *brq = &mqrq->brq;
1642         struct request *req = mqrq->req;
1643         struct request *prq;
1644         struct mmc_blk_data *md = mq->data;
1645         struct mmc_packed *packed = mqrq->packed;
1646         bool do_rel_wr, do_data_tag;
1647         u32 *packed_cmd_hdr;
1648         u8 hdr_blocks;
1649         u8 i = 1;
1650
1651         BUG_ON(!packed);
1652
1653         mqrq->cmd_type = MMC_PACKED_WRITE;
1654         packed->blocks = 0;
1655         packed->idx_failure = MMC_PACKED_NR_IDX;
1656
1657         packed_cmd_hdr = packed->cmd_hdr;
1658         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1659         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1660                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1661         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1662
1663         /*
1664          * Argument for each entry of packed group
1665          */
1666         list_for_each_entry(prq, &packed->list, queuelist) {
1667                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1668                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1669                         (prq->cmd_flags & REQ_META) &&
1670                         (rq_data_dir(prq) == WRITE) &&
1671                         ((brq->data.blocks * brq->data.blksz) >=
1672                          card->ext_csd.data_tag_unit_size);
1673                 /* Argument of CMD23 */
1674                 packed_cmd_hdr[(i * 2)] =
1675                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1676                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1677                         blk_rq_sectors(prq);
1678                 /* Argument of CMD18 or CMD25 */
1679                 packed_cmd_hdr[((i * 2)) + 1] =
1680                         mmc_card_blockaddr(card) ?
1681                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1682                 packed->blocks += blk_rq_sectors(prq);
1683                 i++;
1684         }
1685
1686         memset(brq, 0, sizeof(struct mmc_blk_request));
1687         brq->mrq.cmd = &brq->cmd;
1688         brq->mrq.data = &brq->data;
1689         brq->mrq.sbc = &brq->sbc;
1690         brq->mrq.stop = &brq->stop;
1691
1692         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1693         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1694         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1695
1696         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1697         brq->cmd.arg = blk_rq_pos(req);
1698         if (!mmc_card_blockaddr(card))
1699                 brq->cmd.arg <<= 9;
1700         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1701
1702         brq->data.blksz = 512;
1703         brq->data.blocks = packed->blocks + hdr_blocks;
1704         brq->data.flags |= MMC_DATA_WRITE;
1705
1706         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1707         brq->stop.arg = 0;
1708         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1709
1710         mmc_set_data_timeout(&brq->data, card);
1711
1712         brq->data.sg = mqrq->sg;
1713         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1714
1715         mqrq->mmc_active.mrq = &brq->mrq;
1716         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1717
1718         mmc_queue_bounce_pre(mqrq);
1719 }
1720
1721 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1722                            struct mmc_blk_request *brq, struct request *req,
1723                            int ret)
1724 {
1725         struct mmc_queue_req *mq_rq;
1726         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1727
1728         /*
1729          * If this is an SD card and we're writing, we can first
1730          * mark the known good sectors as ok.
1731          *
1732          * If the card is not SD, we can still ok written sectors
1733          * as reported by the controller (which might be less than
1734          * the real number of written sectors, but never more).
1735          */
1736         if (mmc_card_sd(card)) {
1737                 u32 blocks;
1738
1739                 blocks = mmc_sd_num_wr_blocks(card);
1740                 if (blocks != (u32)-1) {
1741                         ret = blk_end_request(req, 0, blocks << 9);
1742                 }
1743         } else {
1744                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1745                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1746         }
1747         return ret;
1748 }
1749
1750 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1751 {
1752         struct request *prq;
1753         struct mmc_packed *packed = mq_rq->packed;
1754         int idx = packed->idx_failure, i = 0;
1755         int ret = 0;
1756
1757         BUG_ON(!packed);
1758
1759         while (!list_empty(&packed->list)) {
1760                 prq = list_entry_rq(packed->list.next);
1761                 if (idx == i) {
1762                         /* retry from error index */
1763                         packed->nr_entries -= idx;
1764                         mq_rq->req = prq;
1765                         ret = 1;
1766
1767                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1768                                 list_del_init(&prq->queuelist);
1769                                 mmc_blk_clear_packed(mq_rq);
1770                         }
1771                         return ret;
1772                 }
1773                 list_del_init(&prq->queuelist);
1774                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1775                 i++;
1776         }
1777
1778         mmc_blk_clear_packed(mq_rq);
1779         return ret;
1780 }
1781
1782 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1783 {
1784         struct request *prq;
1785         struct mmc_packed *packed = mq_rq->packed;
1786
1787         BUG_ON(!packed);
1788
1789         while (!list_empty(&packed->list)) {
1790                 prq = list_entry_rq(packed->list.next);
1791                 list_del_init(&prq->queuelist);
1792                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1793         }
1794
1795         mmc_blk_clear_packed(mq_rq);
1796 }
1797
1798 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1799                                       struct mmc_queue_req *mq_rq)
1800 {
1801         struct request *prq;
1802         struct request_queue *q = mq->queue;
1803         struct mmc_packed *packed = mq_rq->packed;
1804
1805         BUG_ON(!packed);
1806
1807         while (!list_empty(&packed->list)) {
1808                 prq = list_entry_rq(packed->list.prev);
1809                 if (prq->queuelist.prev != &packed->list) {
1810                         list_del_init(&prq->queuelist);
1811                         spin_lock_irq(q->queue_lock);
1812                         blk_requeue_request(mq->queue, prq);
1813                         spin_unlock_irq(q->queue_lock);
1814                 } else {
1815                         list_del_init(&prq->queuelist);
1816                 }
1817         }
1818
1819         mmc_blk_clear_packed(mq_rq);
1820 }
1821
1822 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1823 {
1824         struct mmc_blk_data *md = mq->data;
1825         struct mmc_card *card = md->queue.card;
1826         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1827         int ret = 1, disable_multi = 0, retry = 0, type;
1828         enum mmc_blk_status status;
1829         struct mmc_queue_req *mq_rq;
1830         struct request *req = rqc;
1831         struct mmc_async_req *areq;
1832         const u8 packed_nr = 2;
1833         u8 reqs = 0;
1834
1835         if (!rqc && !mq->mqrq_prev->req)
1836                 return 0;
1837
1838         if (rqc)
1839                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1840
1841         do {
1842                 if (rqc) {
1843                         /*
1844                          * When 4KB native sector is enabled, only 8 blocks
1845                          * multiple read or write is allowed
1846                          */
1847                         if ((brq->data.blocks & 0x07) &&
1848                             (card->ext_csd.data_sector_size == 4096)) {
1849                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1850                                         req->rq_disk->disk_name);
1851                                 mq_rq = mq->mqrq_cur;
1852                                 goto cmd_abort;
1853                         }
1854
1855                         if (reqs >= packed_nr)
1856                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1857                                                             card, mq);
1858                         else
1859                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1860                         areq = &mq->mqrq_cur->mmc_active;
1861                 } else
1862                         areq = NULL;
1863                 areq = mmc_start_req(card->host, areq, (int *) &status);
1864                 if (!areq) {
1865                         if (status == MMC_BLK_NEW_REQUEST)
1866                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1867                         return 0;
1868                 }
1869
1870                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1871                 brq = &mq_rq->brq;
1872                 req = mq_rq->req;
1873                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1874                 mmc_queue_bounce_post(mq_rq);
1875
1876                 switch (status) {
1877                 case MMC_BLK_SUCCESS:
1878                 case MMC_BLK_PARTIAL:
1879                         /*
1880                          * A block was successfully transferred.
1881                          */
1882                         mmc_blk_reset_success(md, type);
1883
1884                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1885                                 ret = mmc_blk_end_packed_req(mq_rq);
1886                                 break;
1887                         } else {
1888                                 ret = blk_end_request(req, 0,
1889                                                 brq->data.bytes_xfered);
1890                         }
1891
1892                         /*
1893                          * If the blk_end_request function returns non-zero even
1894                          * though all data has been transferred and no errors
1895                          * were returned by the host controller, it's a bug.
1896                          */
1897                         if (status == MMC_BLK_SUCCESS && ret) {
1898                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1899                                        __func__, blk_rq_bytes(req),
1900                                        brq->data.bytes_xfered);
1901                                 rqc = NULL;
1902                                 goto cmd_abort;
1903                         }
1904                         break;
1905                 case MMC_BLK_CMD_ERR:
1906                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1907                         if (!mmc_blk_reset(md, card->host, type))
1908                                 break;
1909                         goto cmd_abort;
1910                 case MMC_BLK_RETRY:
1911                         if (retry++ < 5)
1912                                 break;
1913                         /* Fall through */
1914                 case MMC_BLK_ABORT:
1915                         if (!mmc_blk_reset(md, card->host, type))
1916                                 break;
1917                         goto cmd_abort;
1918                 case MMC_BLK_DATA_ERR: {
1919                         int err;
1920
1921                         err = mmc_blk_reset(md, card->host, type);
1922                         if (!err)
1923                                 break;
1924                         if (err == -ENODEV ||
1925                                 mmc_packed_cmd(mq_rq->cmd_type))
1926                                 goto cmd_abort;
1927                         /* Fall through */
1928                 }
1929                 case MMC_BLK_ECC_ERR:
1930                         if (brq->data.blocks > 1) {
1931                                 /* Redo read one sector at a time */
1932                                 pr_warn("%s: retrying using single block read\n",
1933                                         req->rq_disk->disk_name);
1934                                 disable_multi = 1;
1935                                 break;
1936                         }
1937                         /*
1938                          * After an error, we redo I/O one sector at a
1939                          * time, so we only reach here after trying to
1940                          * read a single sector.
1941                          */
1942                         ret = blk_end_request(req, -EIO,
1943                                                 brq->data.blksz);
1944                         if (!ret)
1945                                 goto start_new_req;
1946                         break;
1947                 case MMC_BLK_NOMEDIUM:
1948                         goto cmd_abort;
1949                 default:
1950                         pr_err("%s: Unhandled return value (%d)",
1951                                         req->rq_disk->disk_name, status);
1952                         goto cmd_abort;
1953                 }
1954
1955                 if (ret) {
1956                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1957                                 if (!mq_rq->packed->retries)
1958                                         goto cmd_abort;
1959                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1960                                 mmc_start_req(card->host,
1961                                               &mq_rq->mmc_active, NULL);
1962                         } else {
1963
1964                                 /*
1965                                  * In case of a incomplete request
1966                                  * prepare it again and resend.
1967                                  */
1968                                 mmc_blk_rw_rq_prep(mq_rq, card,
1969                                                 disable_multi, mq);
1970                                 mmc_start_req(card->host,
1971                                                 &mq_rq->mmc_active, NULL);
1972                         }
1973                 }
1974         } while (ret);
1975
1976         return 1;
1977
1978  cmd_abort:
1979         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1980                 mmc_blk_abort_packed_req(mq_rq);
1981         } else {
1982                 if (mmc_card_removed(card))
1983                         req->cmd_flags |= REQ_QUIET;
1984                 while (ret)
1985                         ret = blk_end_request(req, -EIO,
1986                                         blk_rq_cur_bytes(req));
1987         }
1988
1989  start_new_req:
1990         if (rqc) {
1991                 if (mmc_card_removed(card)) {
1992                         rqc->cmd_flags |= REQ_QUIET;
1993                         blk_end_request_all(rqc, -EIO);
1994                 } else {
1995                         /*
1996                          * If current request is packed, it needs to put back.
1997                          */
1998                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1999                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2000
2001                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2002                         mmc_start_req(card->host,
2003                                       &mq->mqrq_cur->mmc_active, NULL);
2004                 }
2005         }
2006
2007         return 0;
2008 }
2009
2010 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2011 {
2012         int ret;
2013         struct mmc_blk_data *md = mq->data;
2014         struct mmc_card *card = md->queue.card;
2015         struct mmc_host *host = card->host;
2016         unsigned long flags;
2017         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2018
2019         if (req && !mq->mqrq_prev->req)
2020                 /* claim host only for the first request */
2021                 mmc_get_card(card);
2022
2023         ret = mmc_blk_part_switch(card, md);
2024         if (ret) {
2025                 if (req) {
2026                         blk_end_request_all(req, -EIO);
2027                 }
2028                 ret = 0;
2029                 goto out;
2030         }
2031
2032         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2033         if (cmd_flags & REQ_DISCARD) {
2034                 /* complete ongoing async transfer before issuing discard */
2035                 if (card->host->areq)
2036                         mmc_blk_issue_rw_rq(mq, NULL);
2037                 if (req->cmd_flags & REQ_SECURE)
2038                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2039                 else
2040                         ret = mmc_blk_issue_discard_rq(mq, req);
2041         } else if (cmd_flags & REQ_FLUSH) {
2042                 /* complete ongoing async transfer before issuing flush */
2043                 if (card->host->areq)
2044                         mmc_blk_issue_rw_rq(mq, NULL);
2045                 ret = mmc_blk_issue_flush(mq, req);
2046         } else {
2047                 if (!req && host->areq) {
2048                         spin_lock_irqsave(&host->context_info.lock, flags);
2049                         host->context_info.is_waiting_last_req = true;
2050                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2051                 }
2052                 ret = mmc_blk_issue_rw_rq(mq, req);
2053         }
2054
2055 out:
2056         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2057              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2058                 /*
2059                  * Release host when there are no more requests
2060                  * and after special request(discard, flush) is done.
2061                  * In case sepecial request, there is no reentry to
2062                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2063                  */
2064                 mmc_put_card(card);
2065         return ret;
2066 }
2067
2068 static inline int mmc_blk_readonly(struct mmc_card *card)
2069 {
2070         return mmc_card_readonly(card) ||
2071                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2072 }
2073
2074 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2075                                               struct device *parent,
2076                                               sector_t size,
2077                                               bool default_ro,
2078                                               const char *subname,
2079                                               int area_type)
2080 {
2081         struct mmc_blk_data *md;
2082         int devidx, ret;
2083
2084         devidx = find_first_zero_bit(dev_use, max_devices);
2085         if (devidx >= max_devices)
2086                 return ERR_PTR(-ENOSPC);
2087         __set_bit(devidx, dev_use);
2088
2089         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2090         if (!md) {
2091                 ret = -ENOMEM;
2092                 goto out;
2093         }
2094
2095         /*
2096          * !subname implies we are creating main mmc_blk_data that will be
2097          * associated with mmc_card with dev_set_drvdata. Due to device
2098          * partitions, devidx will not coincide with a per-physical card
2099          * index anymore so we keep track of a name index.
2100          */
2101         if (!subname) {
2102                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2103                 __set_bit(md->name_idx, name_use);
2104         } else
2105                 md->name_idx = ((struct mmc_blk_data *)
2106                                 dev_to_disk(parent)->private_data)->name_idx;
2107
2108         md->area_type = area_type;
2109
2110         /*
2111          * Set the read-only status based on the supported commands
2112          * and the write protect switch.
2113          */
2114         md->read_only = mmc_blk_readonly(card);
2115
2116         md->disk = alloc_disk(perdev_minors);
2117         if (md->disk == NULL) {
2118                 ret = -ENOMEM;
2119                 goto err_kfree;
2120         }
2121
2122         spin_lock_init(&md->lock);
2123         INIT_LIST_HEAD(&md->part);
2124         md->usage = 1;
2125
2126         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2127         if (ret)
2128                 goto err_putdisk;
2129
2130         md->queue.issue_fn = mmc_blk_issue_rq;
2131         md->queue.data = md;
2132
2133         md->disk->major = MMC_BLOCK_MAJOR;
2134         md->disk->first_minor = devidx * perdev_minors;
2135         md->disk->fops = &mmc_bdops;
2136         md->disk->private_data = md;
2137         md->disk->queue = md->queue.queue;
2138         md->disk->driverfs_dev = parent;
2139         set_disk_ro(md->disk, md->read_only || default_ro);
2140         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2141                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2142
2143         /*
2144          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2145          *
2146          * - be set for removable media with permanent block devices
2147          * - be unset for removable block devices with permanent media
2148          *
2149          * Since MMC block devices clearly fall under the second
2150          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2151          * should use the block device creation/destruction hotplug
2152          * messages to tell when the card is present.
2153          */
2154
2155         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2156                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2157
2158         if (mmc_card_mmc(card))
2159                 blk_queue_logical_block_size(md->queue.queue,
2160                                              card->ext_csd.data_sector_size);
2161         else
2162                 blk_queue_logical_block_size(md->queue.queue, 512);
2163
2164         set_capacity(md->disk, size);
2165
2166         if (mmc_host_cmd23(card->host)) {
2167                 if (mmc_card_mmc(card) ||
2168                     (mmc_card_sd(card) &&
2169                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2170                         md->flags |= MMC_BLK_CMD23;
2171         }
2172
2173         if (mmc_card_mmc(card) &&
2174             md->flags & MMC_BLK_CMD23 &&
2175             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2176              card->ext_csd.rel_sectors)) {
2177                 md->flags |= MMC_BLK_REL_WR;
2178                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2179         }
2180
2181         if (mmc_card_mmc(card) &&
2182             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2183             (md->flags & MMC_BLK_CMD23) &&
2184             card->ext_csd.packed_event_en) {
2185                 if (!mmc_packed_init(&md->queue, card))
2186                         md->flags |= MMC_BLK_PACKED_CMD;
2187         }
2188
2189         return md;
2190
2191  err_putdisk:
2192         put_disk(md->disk);
2193  err_kfree:
2194         kfree(md);
2195  out:
2196         return ERR_PTR(ret);
2197 }
2198
2199 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2200 {
2201         sector_t size;
2202         struct mmc_blk_data *md;
2203
2204         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2205                 /*
2206                  * The EXT_CSD sector count is in number or 512 byte
2207                  * sectors.
2208                  */
2209                 size = card->ext_csd.sectors;
2210         } else {
2211                 /*
2212                  * The CSD capacity field is in units of read_blkbits.
2213                  * set_capacity takes units of 512 bytes.
2214                  */
2215                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2216         }
2217
2218         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2219                                         MMC_BLK_DATA_AREA_MAIN);
2220         return md;
2221 }
2222
2223 static int mmc_blk_alloc_part(struct mmc_card *card,
2224                               struct mmc_blk_data *md,
2225                               unsigned int part_type,
2226                               sector_t size,
2227                               bool default_ro,
2228                               const char *subname,
2229                               int area_type)
2230 {
2231         char cap_str[10];
2232         struct mmc_blk_data *part_md;
2233
2234         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2235                                     subname, area_type);
2236         if (IS_ERR(part_md))
2237                 return PTR_ERR(part_md);
2238         part_md->part_type = part_type;
2239         list_add(&part_md->part, &md->part);
2240
2241         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2242                         cap_str, sizeof(cap_str));
2243         pr_info("%s: %s %s partition %u %s\n",
2244                part_md->disk->disk_name, mmc_card_id(card),
2245                mmc_card_name(card), part_md->part_type, cap_str);
2246         return 0;
2247 }
2248
2249 /* MMC Physical partitions consist of two boot partitions and
2250  * up to four general purpose partitions.
2251  * For each partition enabled in EXT_CSD a block device will be allocatedi
2252  * to provide access to the partition.
2253  */
2254
2255 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2256 {
2257         int idx, ret = 0;
2258
2259         if (!mmc_card_mmc(card))
2260                 return 0;
2261
2262         for (idx = 0; idx < card->nr_parts; idx++) {
2263                 if (card->part[idx].size) {
2264                         ret = mmc_blk_alloc_part(card, md,
2265                                 card->part[idx].part_cfg,
2266                                 card->part[idx].size >> 9,
2267                                 card->part[idx].force_ro,
2268                                 card->part[idx].name,
2269                                 card->part[idx].area_type);
2270                         if (ret)
2271                                 return ret;
2272                 }
2273         }
2274
2275         return ret;
2276 }
2277
2278 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2279 {
2280         struct mmc_card *card;
2281
2282         if (md) {
2283                 /*
2284                  * Flush remaining requests and free queues. It
2285                  * is freeing the queue that stops new requests
2286                  * from being accepted.
2287                  */
2288                 card = md->queue.card;
2289                 mmc_cleanup_queue(&md->queue);
2290                 if (md->flags & MMC_BLK_PACKED_CMD)
2291                         mmc_packed_clean(&md->queue);
2292                 if (md->disk->flags & GENHD_FL_UP) {
2293                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2294                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2295                                         card->ext_csd.boot_ro_lockable)
2296                                 device_remove_file(disk_to_dev(md->disk),
2297                                         &md->power_ro_lock);
2298
2299                         del_gendisk(md->disk);
2300                 }
2301                 mmc_blk_put(md);
2302         }
2303 }
2304
2305 static void mmc_blk_remove_parts(struct mmc_card *card,
2306                                  struct mmc_blk_data *md)
2307 {
2308         struct list_head *pos, *q;
2309         struct mmc_blk_data *part_md;
2310
2311         __clear_bit(md->name_idx, name_use);
2312         list_for_each_safe(pos, q, &md->part) {
2313                 part_md = list_entry(pos, struct mmc_blk_data, part);
2314                 list_del(pos);
2315                 mmc_blk_remove_req(part_md);
2316         }
2317 }
2318
2319 static int mmc_add_disk(struct mmc_blk_data *md)
2320 {
2321         int ret;
2322         struct mmc_card *card = md->queue.card;
2323
2324         add_disk(md->disk);
2325         md->force_ro.show = force_ro_show;
2326         md->force_ro.store = force_ro_store;
2327         sysfs_attr_init(&md->force_ro.attr);
2328         md->force_ro.attr.name = "force_ro";
2329         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2330         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2331         if (ret)
2332                 goto force_ro_fail;
2333
2334         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2335              card->ext_csd.boot_ro_lockable) {
2336                 umode_t mode;
2337
2338                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2339                         mode = S_IRUGO;
2340                 else
2341                         mode = S_IRUGO | S_IWUSR;
2342
2343                 md->power_ro_lock.show = power_ro_lock_show;
2344                 md->power_ro_lock.store = power_ro_lock_store;
2345                 sysfs_attr_init(&md->power_ro_lock.attr);
2346                 md->power_ro_lock.attr.mode = mode;
2347                 md->power_ro_lock.attr.name =
2348                                         "ro_lock_until_next_power_on";
2349                 ret = device_create_file(disk_to_dev(md->disk),
2350                                 &md->power_ro_lock);
2351                 if (ret)
2352                         goto power_ro_lock_fail;
2353         }
2354         return ret;
2355
2356 power_ro_lock_fail:
2357         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2358 force_ro_fail:
2359         del_gendisk(md->disk);
2360
2361         return ret;
2362 }
2363
2364 #define CID_MANFID_SANDISK      0x2
2365 #define CID_MANFID_TOSHIBA      0x11
2366 #define CID_MANFID_MICRON       0x13
2367 #define CID_MANFID_SAMSUNG      0x15
2368
2369 static const struct mmc_fixup blk_fixups[] =
2370 {
2371         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2372                   MMC_QUIRK_INAND_CMD38),
2373         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2374                   MMC_QUIRK_INAND_CMD38),
2375         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2376                   MMC_QUIRK_INAND_CMD38),
2377         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2378                   MMC_QUIRK_INAND_CMD38),
2379         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2380                   MMC_QUIRK_INAND_CMD38),
2381
2382         /*
2383          * Some MMC cards experience performance degradation with CMD23
2384          * instead of CMD12-bounded multiblock transfers. For now we'll
2385          * black list what's bad...
2386          * - Certain Toshiba cards.
2387          *
2388          * N.B. This doesn't affect SD cards.
2389          */
2390         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2391                   MMC_QUIRK_BLK_NO_CMD23),
2392         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2393                   MMC_QUIRK_BLK_NO_CMD23),
2394         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2395                   MMC_QUIRK_BLK_NO_CMD23),
2396
2397         /*
2398          * Some Micron MMC cards needs longer data read timeout than
2399          * indicated in CSD.
2400          */
2401         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2402                   MMC_QUIRK_LONG_READ_TIME),
2403
2404         /*
2405          * On these Samsung MoviNAND parts, performing secure erase or
2406          * secure trim can result in unrecoverable corruption due to a
2407          * firmware bug.
2408          */
2409         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2410                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2411         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2412                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2413         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2414                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2415         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2416                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2417         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2418                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2419         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2420                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2421         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2422                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2423         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2424                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2425
2426         END_FIXUP
2427 };
2428
2429 static int mmc_blk_probe(struct device *dev)
2430 {
2431         struct mmc_card *card = mmc_dev_to_card(dev);
2432         struct mmc_blk_data *md, *part_md;
2433         char cap_str[10];
2434
2435         /*
2436          * Check that the card supports the command class(es) we need.
2437          */
2438         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2439                 return -ENODEV;
2440
2441         mmc_fixup_device(card, blk_fixups);
2442
2443         md = mmc_blk_alloc(card);
2444         if (IS_ERR(md))
2445                 return PTR_ERR(md);
2446
2447         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2448                         cap_str, sizeof(cap_str));
2449         pr_info("%s: %s %s %s %s\n",
2450                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2451                 cap_str, md->read_only ? "(ro)" : "");
2452
2453         if (mmc_blk_alloc_parts(card, md))
2454                 goto out;
2455
2456         dev_set_drvdata(dev, md);
2457
2458         if (mmc_add_disk(md))
2459                 goto out;
2460
2461         list_for_each_entry(part_md, &md->part, part) {
2462                 if (mmc_add_disk(part_md))
2463                         goto out;
2464         }
2465
2466         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2467         pm_runtime_use_autosuspend(&card->dev);
2468
2469         /*
2470          * Don't enable runtime PM for SD-combo cards here. Leave that
2471          * decision to be taken during the SDIO init sequence instead.
2472          */
2473         if (card->type != MMC_TYPE_SD_COMBO) {
2474                 pm_runtime_set_active(&card->dev);
2475                 pm_runtime_enable(&card->dev);
2476         }
2477
2478         return 0;
2479
2480  out:
2481         mmc_blk_remove_parts(card, md);
2482         mmc_blk_remove_req(md);
2483         return 0;
2484 }
2485
2486 static int mmc_blk_remove(struct device *dev)
2487 {
2488         struct mmc_card *card = mmc_dev_to_card(dev);
2489         struct mmc_blk_data *md = dev_get_drvdata(dev);
2490
2491         mmc_blk_remove_parts(card, md);
2492         pm_runtime_get_sync(&card->dev);
2493         mmc_claim_host(card->host);
2494         mmc_blk_part_switch(card, md);
2495         mmc_release_host(card->host);
2496         if (card->type != MMC_TYPE_SD_COMBO)
2497                 pm_runtime_disable(&card->dev);
2498         pm_runtime_put_noidle(&card->dev);
2499         mmc_blk_remove_req(md);
2500         dev_set_drvdata(dev, NULL);
2501
2502         return 0;
2503 }
2504
2505 static int _mmc_blk_suspend(struct device *dev)
2506 {
2507         struct mmc_blk_data *part_md;
2508         struct mmc_blk_data *md = dev_get_drvdata(dev);
2509
2510         if (md) {
2511                 mmc_queue_suspend(&md->queue);
2512                 list_for_each_entry(part_md, &md->part, part) {
2513                         mmc_queue_suspend(&part_md->queue);
2514                 }
2515         }
2516         return 0;
2517 }
2518
2519 static void mmc_blk_shutdown(struct device *dev)
2520 {
2521         _mmc_blk_suspend(dev);
2522 }
2523
2524 #ifdef CONFIG_PM_SLEEP
2525 static int mmc_blk_suspend(struct device *dev)
2526 {
2527         return _mmc_blk_suspend(dev);
2528 }
2529
2530 static int mmc_blk_resume(struct device *dev)
2531 {
2532         struct mmc_blk_data *part_md;
2533         struct mmc_blk_data *md = dev_get_drvdata(dev);
2534
2535         if (md) {
2536                 /*
2537                  * Resume involves the card going into idle state,
2538                  * so current partition is always the main one.
2539                  */
2540                 md->part_curr = md->part_type;
2541                 mmc_queue_resume(&md->queue);
2542                 list_for_each_entry(part_md, &md->part, part) {
2543                         mmc_queue_resume(&part_md->queue);
2544                 }
2545         }
2546         return 0;
2547 }
2548 #endif
2549
2550 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2551
2552 static struct device_driver mmc_driver = {
2553         .name           = "mmcblk",
2554         .pm             = &mmc_blk_pm_ops,
2555         .probe          = mmc_blk_probe,
2556         .remove         = mmc_blk_remove,
2557         .shutdown       = mmc_blk_shutdown,
2558 };
2559
2560 static int __init mmc_blk_init(void)
2561 {
2562         int res;
2563
2564         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2565                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2566
2567         max_devices = 256 / perdev_minors;
2568
2569         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2570         if (res)
2571                 goto out;
2572
2573         res = mmc_register_driver(&mmc_driver);
2574         if (res)
2575                 goto out2;
2576
2577         return 0;
2578  out2:
2579         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2580  out:
2581         return res;
2582 }
2583
2584 static void __exit mmc_blk_exit(void)
2585 {
2586         mmc_unregister_driver(&mmc_driver);
2587         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2588 }
2589
2590 module_init(mmc_blk_init);
2591 module_exit(mmc_blk_exit);
2592
2593 MODULE_LICENSE("GPL");
2594 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2595