drivers/mmc/card/block.c

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