kernel/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         mmc_blk_put(md);
 212
 213         return ret;
 214 }
 215
 216 static ssize_t power_ro_lock_store(struct device *dev,
 217                 struct device_attribute *attr, const char *buf, size_t count)
 218 {
 219         int ret;
 220         struct mmc_blk_data *md, *part_md;
 221         struct mmc_card *card;
 222         unsigned long set;
 223
 224         if (kstrtoul(buf, 0, &set))
 225                 return -EINVAL;
 226
 227         if (set != 1)
 228                 return count;
 229
 230         md = mmc_blk_get(dev_to_disk(dev));
 231         card = md->queue.card;
 232
 233         mmc_get_card(card);
 234
 235         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 236                                 card->ext_csd.boot_ro_lock |
 237                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 238                                 card->ext_csd.part_time);
 239         if (ret)
 240                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 241         else
 242                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 243
 244         mmc_put_card(card);
 245
 246         if (!ret) {
 247                 pr_info("%s: Locking boot partition ro until next power on\n",
 248                         md->disk->disk_name);
 249                 set_disk_ro(md->disk, 1);
 250
 251                 list_for_each_entry(part_md, &md->part, part)
 252                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 253                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 254                                 set_disk_ro(part_md->disk, 1);
 255                         }
 256         }
 257
 258         mmc_blk_put(md);
 259         return count;
 260 }
 261
 262 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 263                              char *buf)
 264 {
 265         int ret;
 266         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 267
 268         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 269                        get_disk_ro(dev_to_disk(dev)) ^
 270                        md->read_only);
 271         mmc_blk_put(md);
 272         return ret;
 273 }
 274
 275 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 276                               const char *buf, size_t count)
 277 {
 278         int ret;
 279         char *end;
 280         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 281         unsigned long set = simple_strtoul(buf, &end, 0);
 282         if (end == buf) {
 283                 ret = -EINVAL;
 284                 goto out;
 285         }
 286
 287         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 288         ret = count;
 289 out:
 290         mmc_blk_put(md);
 291         return ret;
 292 }
 293
 294 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 295 {
 296         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 297         int ret = -ENXIO;
 298
 299         mutex_lock(&block_mutex);
 300         if (md) {
 301                 if (md->usage == 2)
 302                         check_disk_change(bdev);
 303                 ret = 0;
 304
 305                 if ((mode & FMODE_WRITE) && md->read_only) {
 306                         mmc_blk_put(md);
 307                         ret = -EROFS;
 308                 }
 309         }
 310         mutex_unlock(&block_mutex);
 311
 312         return ret;
 313 }
 314
 315 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 316 {
 317         struct mmc_blk_data *md = disk->private_data;
 318
 319         mutex_lock(&block_mutex);
 320         mmc_blk_put(md);
 321         mutex_unlock(&block_mutex);
 322 }
 323
 324 static int
 325 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 326 {
 327         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 328         geo->heads = 4;
 329         geo->sectors = 16;
 330         return 0;
 331 }
 332
 333 struct mmc_blk_ioc_data {
 334         struct mmc_ioc_cmd ic;
 335         unsigned char *buf;
 336         u64 buf_bytes;
 337 };
 338
 339 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 340         struct mmc_ioc_cmd __user *user)
 341 {
 342         struct mmc_blk_ioc_data *idata;
 343         int err;
 344
 345         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 346         if (!idata) {
 347                 err = -ENOMEM;
 348                 goto out;
 349         }
 350
 351         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 352                 err = -EFAULT;
 353                 goto idata_err;
 354         }
 355
 356         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 357         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 358                 err = -EOVERFLOW;
 359                 goto idata_err;
 360         }
 361
 362         if (!idata->buf_bytes)
 363                 return idata;
 364
 365         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 366         if (!idata->buf) {
 367                 err = -ENOMEM;
 368                 goto idata_err;
 369         }
 370
 371         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 372                                         idata->ic.data_ptr, idata->buf_bytes)) {
 373                 err = -EFAULT;
 374                 goto copy_err;
 375         }
 376
 377         return idata;
 378
 379 copy_err:
 380         kfree(idata->buf);
 381 idata_err:
 382         kfree(idata);
 383 out:
 384         return ERR_PTR(err);
 385 }
 386
 387 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 388                                        u32 retries_max)
 389 {
 390         int err;
 391         u32 retry_count = 0;
 392
 393         if (!status || !retries_max)
 394                 return -EINVAL;
 395
 396         do {
 397                 err = get_card_status(card, status, 5);
 398                 if (err)
 399                         break;
 400
 401                 if (!R1_STATUS(*status) &&
 402                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 403                         break; /* RPMB programming operation complete */
 404
 405                 /*
 406                  * Rechedule to give the MMC device a chance to continue
 407                  * processing the previous command without being polled too
 408                  * frequently.
 409                  */
 410                 usleep_range(1000, 5000);
 411         } while (++retry_count < retries_max);
 412
 413         if (retry_count == retries_max)
 414                 err = -EPERM;
 415
 416         return err;
 417 }
 418
 419 static int ioctl_do_sanitize(struct mmc_card *card)
 420 {
 421         int err;
 422
 423         if (!mmc_can_sanitize(card)) {
 424                         pr_warn("%s: %s - SANITIZE is not supported\n",
 425                                 mmc_hostname(card->host), __func__);
 426                         err = -EOPNOTSUPP;
 427                         goto out;
 428         }
 429
 430         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 431                 mmc_hostname(card->host), __func__);
 432
 433         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 434                                         EXT_CSD_SANITIZE_START, 1,
 435                                         MMC_SANITIZE_REQ_TIMEOUT);
 436
 437         if (err)
 438                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 439                        mmc_hostname(card->host), __func__, err);
 440
 441         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 442                                              __func__);
 443 out:
 444         return err;
 445 }
 446
 447 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 448         struct mmc_ioc_cmd __user *ic_ptr)
 449 {
 450         struct mmc_blk_ioc_data *idata;
 451         struct mmc_blk_data *md;
 452         struct mmc_card *card;
 453         struct mmc_command cmd = {0};
 454         struct mmc_data data = {0};
 455         struct mmc_request mrq = {NULL};
 456         struct scatterlist sg;
 457         int err;
 458         int is_rpmb = false;
 459         u32 status = 0;
 460
 461         /*
 462          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 463          * whole block device, not on a partition.  This prevents overspray
 464          * between sibling partitions.
 465          */
 466         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 467                 return -EPERM;
 468
 469         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 470         if (IS_ERR(idata))
 471                 return PTR_ERR(idata);
 472
 473         md = mmc_blk_get(bdev->bd_disk);
 474         if (!md) {
 475                 err = -EINVAL;
 476                 goto cmd_err;
 477         }
 478
 479         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 480                 is_rpmb = true;
 481
 482         card = md->queue.card;
 483         if (IS_ERR(card)) {
 484                 err = PTR_ERR(card);
 485                 goto cmd_done;
 486         }
 487
 488         cmd.opcode = idata->ic.opcode;
 489         cmd.arg = idata->ic.arg;
 490         cmd.flags = idata->ic.flags;
 491
 492         if (idata->buf_bytes) {
 493                 data.sg = &sg;
 494                 data.sg_len = 1;
 495                 data.blksz = idata->ic.blksz;
 496                 data.blocks = idata->ic.blocks;
 497
 498                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 499
 500                 if (idata->ic.write_flag)
 501                         data.flags = MMC_DATA_WRITE;
 502                 else
 503                         data.flags = MMC_DATA_READ;
 504
 505                 /* data.flags must already be set before doing this. */
 506                 mmc_set_data_timeout(&data, card);
 507
 508                 /* Allow overriding the timeout_ns for empirical tuning. */
 509                 if (idata->ic.data_timeout_ns)
 510                         data.timeout_ns = idata->ic.data_timeout_ns;
 511
 512                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 513                         /*
 514                          * Pretend this is a data transfer and rely on the
 515                          * host driver to compute timeout.  When all host
 516                          * drivers support cmd.cmd_timeout for R1B, this
 517                          * can be changed to:
 518                          *
 519                          *     mrq.data = NULL;
 520                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 521                          */
 522                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 523                 }
 524
 525                 mrq.data = &data;
 526         }
 527
 528         mrq.cmd = &cmd;
 529
 530         mmc_get_card(card);
 531
 532         err = mmc_blk_part_switch(card, md);
 533         if (err)
 534                 goto cmd_rel_host;
 535
 536         if (idata->ic.is_acmd) {
 537                 err = mmc_app_cmd(card->host, card);
 538                 if (err)
 539                         goto cmd_rel_host;
 540         }
 541
 542         if (is_rpmb) {
 543                 err = mmc_set_blockcount(card, data.blocks,
 544                         idata->ic.write_flag & (1 << 31));
 545                 if (err)
 546                         goto cmd_rel_host;
 547         }
 548
 549         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 550             (cmd.opcode == MMC_SWITCH)) {
 551                 err = ioctl_do_sanitize(card);
 552
 553                 if (err)
 554                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 555                                __func__, err);
 556
 557                 goto cmd_rel_host;
 558         }
 559
 560         mmc_wait_for_req(card->host, &mrq);
 561
 562         if (cmd.error) {
 563                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 564                                                 __func__, cmd.error);
 565                 err = cmd.error;
 566                 goto cmd_rel_host;
 567         }
 568         if (data.error) {
 569                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 570                                                 __func__, data.error);
 571                 err = data.error;
 572                 goto cmd_rel_host;
 573         }
 574
 575         /*
 576          * According to the SD specs, some commands require a delay after
 577          * issuing the command.
 578          */
 579         if (idata->ic.postsleep_min_us)
 580                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 581
 582         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 583                 err = -EFAULT;
 584                 goto cmd_rel_host;
 585         }
 586
 587         if (!idata->ic.write_flag) {
 588                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 589                                                 idata->buf, idata->buf_bytes)) {
 590                         err = -EFAULT;
 591                         goto cmd_rel_host;
 592                 }
 593         }
 594
 595         if (is_rpmb) {
 596                 /*
 597                  * Ensure RPMB command has completed by polling CMD13
 598                  * "Send Status".
 599                  */
 600                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 601                 if (err)
 602                         dev_err(mmc_dev(card->host),
 603                                         "%s: Card Status=0x%08X, error %d\n",
 604                                         __func__, status, err);
 605         }
 606
 607 cmd_rel_host:
 608         mmc_put_card(card);
 609
 610 cmd_done:
 611         mmc_blk_put(md);
 612 cmd_err:
 613         kfree(idata->buf);
 614         kfree(idata);
 615         return err;
 616 }
 617
 618 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 619         unsigned int cmd, unsigned long arg)
 620 {
 621         int ret = -EINVAL;
 622         if (cmd == MMC_IOC_CMD)
 623                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 624         return ret;
 625 }
 626
 627 #ifdef CONFIG_COMPAT
 628 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 629         unsigned int cmd, unsigned long arg)
 630 {
 631         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 632 }
 633 #endif
 634
 635 static const struct block_device_operations mmc_bdops = {
 636         .open                   = mmc_blk_open,
 637         .release                = mmc_blk_release,
 638         .getgeo                 = mmc_blk_getgeo,
 639         .owner                  = THIS_MODULE,
 640         .ioctl                  = mmc_blk_ioctl,
 641 #ifdef CONFIG_COMPAT
 642         .compat_ioctl           = mmc_blk_compat_ioctl,
 643 #endif
 644 };
 645
 646 static inline int mmc_blk_part_switch(struct mmc_card *card,
 647                                       struct mmc_blk_data *md)
 648 {
 649         int ret;
 650         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 651
 652         if (main_md->part_curr == md->part_type)
 653                 return 0;
 654
 655         if (mmc_card_mmc(card)) {
 656                 u8 part_config = card->ext_csd.part_config;
 657
 658                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 659                 part_config |= md->part_type;
 660
 661                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 662                                  EXT_CSD_PART_CONFIG, part_config,
 663                                  card->ext_csd.part_time);
 664                 if (ret)
 665                         return ret;
 666
 667                 card->ext_csd.part_config = part_config;
 668         }
 669
 670         main_md->part_curr = md->part_type;
 671         return 0;
 672 }
 673
 674 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 675 {
 676         int err;
 677         u32 result;
 678         __be32 *blocks;
 679
 680         struct mmc_request mrq = {NULL};
 681         struct mmc_command cmd = {0};
 682         struct mmc_data data = {0};
 683
 684         struct scatterlist sg;
 685
 686         cmd.opcode = MMC_APP_CMD;
 687         cmd.arg = card->rca << 16;
 688         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 689
 690         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 691         if (err)
 692                 return (u32)-1;
 693         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 694                 return (u32)-1;
 695
 696         memset(&cmd, 0, sizeof(struct mmc_command));
 697
 698         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 699         cmd.arg = 0;
 700         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 701
 702         data.blksz = 4;
 703         data.blocks = 1;
 704         data.flags = MMC_DATA_READ;
 705         data.sg = &sg;
 706         data.sg_len = 1;
 707         mmc_set_data_timeout(&data, card);
 708
 709         mrq.cmd = &cmd;
 710         mrq.data = &data;
 711
 712         blocks = kmalloc(4, GFP_KERNEL);
 713         if (!blocks)
 714                 return (u32)-1;
 715
 716         sg_init_one(&sg, blocks, 4);
 717
 718         mmc_wait_for_req(card->host, &mrq);
 719
 720         result = ntohl(*blocks);
 721         kfree(blocks);
 722
 723         if (cmd.error || data.error)
 724                 result = (u32)-1;
 725
 726         return result;
 727 }
 728
 729 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 730 {
 731         struct mmc_command cmd = {0};
 732         int err;
 733
 734         cmd.opcode = MMC_SEND_STATUS;
 735         if (!mmc_host_is_spi(card->host))
 736                 cmd.arg = card->rca << 16;
 737         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 738         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 739         if (err == 0)
 740                 *status = cmd.resp[0];
 741         return err;
 742 }
 743
 744 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 745                 bool hw_busy_detect, struct request *req, int *gen_err)
 746 {
 747         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 748         int err = 0;
 749         u32 status;
 750
 751         do {
 752                 err = get_card_status(card, &status, 5);
 753                 if (err) {
 754                         pr_err("%s: error %d requesting status\n",
 755                                req->rq_disk->disk_name, err);
 756                         return err;
 757                 }
 758
 759                 if (status & R1_ERROR) {
 760                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 761                                 req->rq_disk->disk_name, __func__, status);
 762                         *gen_err = 1;
 763                 }
 764
 765                 /* We may rely on the host hw to handle busy detection.*/
 766                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 767                         hw_busy_detect)
 768                         break;
 769
 770                 /*
 771                  * Timeout if the device never becomes ready for data and never
 772                  * leaves the program state.
 773                  */
 774                 if (time_after(jiffies, timeout)) {
 775                         pr_err("%s: Card stuck in programming state! %s %s\n",
 776                                 mmc_hostname(card->host),
 777                                 req->rq_disk->disk_name, __func__);
 778                         return -ETIMEDOUT;
 779                 }
 780
 781                 /*
 782                  * Some cards mishandle the status bits,
 783                  * so make sure to check both the busy
 784                  * indication and the card state.
 785                  */
 786         } while (!(status & R1_READY_FOR_DATA) ||
 787                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 788
 789         return err;
 790 }
 791
 792 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 793                 struct request *req, int *gen_err, u32 *stop_status)
 794 {
 795         struct mmc_host *host = card->host;
 796         struct mmc_command cmd = {0};
 797         int err;
 798         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 799
 800         /*
 801          * Normally we use R1B responses for WRITE, but in cases where the host
 802          * has specified a max_busy_timeout we need to validate it. A failure
 803          * means we need to prevent the host from doing hw busy detection, which
 804          * is done by converting to a R1 response instead.
 805          */
 806         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 807                 use_r1b_resp = false;
 808
 809         cmd.opcode = MMC_STOP_TRANSMISSION;
 810         if (use_r1b_resp) {
 811                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 812                 cmd.busy_timeout = timeout_ms;
 813         } else {
 814                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 815         }
 816
 817         err = mmc_wait_for_cmd(host, &cmd, 5);
 818         if (err)
 819                 return err;
 820
 821         *stop_status = cmd.resp[0];
 822
 823         /* No need to check card status in case of READ. */
 824         if (rq_data_dir(req) == READ)
 825                 return 0;
 826
 827         if (!mmc_host_is_spi(host) &&
 828                 (*stop_status & R1_ERROR)) {
 829                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 830                         req->rq_disk->disk_name, __func__, *stop_status);
 831                 *gen_err = 1;
 832         }
 833
 834         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 835 }
 836
 837 #define ERR_NOMEDIUM    3
 838 #define ERR_RETRY       2
 839 #define ERR_ABORT       1
 840 #define ERR_CONTINUE    0
 841
 842 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 843         bool status_valid, u32 status)
 844 {
 845         switch (error) {
 846         case -EILSEQ:
 847                 /* response crc error, retry the r/w cmd */
 848                 pr_err("%s: %s sending %s command, card status %#x\n",
 849                         req->rq_disk->disk_name, "response CRC error",
 850                         name, status);
 851                 return ERR_RETRY;
 852
 853         case -ETIMEDOUT:
 854                 pr_err("%s: %s sending %s command, card status %#x\n",
 855                         req->rq_disk->disk_name, "timed out", name, status);
 856
 857                 /* If the status cmd initially failed, retry the r/w cmd */
 858                 if (!status_valid)
 859                         return ERR_RETRY;
 860
 861                 /*
 862                  * If it was a r/w cmd crc error, or illegal command
 863                  * (eg, issued in wrong state) then retry - we should
 864                  * have corrected the state problem above.
 865                  */
 866                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 867                         return ERR_RETRY;
 868
 869                 /* Otherwise abort the command */
 870                 return ERR_ABORT;
 871
 872         default:
 873                 /* We don't understand the error code the driver gave us */
 874                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 875                        req->rq_disk->disk_name, error, status);
 876                 return ERR_ABORT;
 877         }
 878 }
 879
 880 /*
 881  * Initial r/w and stop cmd error recovery.
 882  * We don't know whether the card received the r/w cmd or not, so try to
 883  * restore things back to a sane state.  Essentially, we do this as follows:
 884  * - Obtain card status.  If the first attempt to obtain card status fails,
 885  *   the status word will reflect the failed status cmd, not the failed
 886  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 887  *   longer communicate with the card.
 888  * - Check the card state.  If the card received the cmd but there was a
 889  *   transient problem with the response, it might still be in a data transfer
 890  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 891  * - If the r/w cmd failed due to a response CRC error, it was probably
 892  *   transient, so retry the cmd.
 893  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 894  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 895  *   illegal cmd, retry.
 896  * Otherwise we don't understand what happened, so abort.
 897  */
 898 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 899         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 900 {
 901         bool prev_cmd_status_valid = true;
 902         u32 status, stop_status = 0;
 903         int err, retry;
 904
 905         if (mmc_card_removed(card))
 906                 return ERR_NOMEDIUM;
 907
 908         /*
 909          * Try to get card status which indicates both the card state
 910          * and why there was no response.  If the first attempt fails,
 911          * we can't be sure the returned status is for the r/w command.
 912          */
 913         for (retry = 2; retry >= 0; retry--) {
 914                 err = get_card_status(card, &status, 0);
 915                 if (!err)
 916                         break;
 917
 918                 prev_cmd_status_valid = false;
 919                 pr_err("%s: error %d sending status command, %sing\n",
 920                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 921         }
 922
 923         /* We couldn't get a response from the card.  Give up. */
 924         if (err) {
 925                 /* Check if the card is removed */
 926                 if (mmc_detect_card_removed(card->host))
 927                         return ERR_NOMEDIUM;
 928                 return ERR_ABORT;
 929         }
 930
 931         /* Flag ECC errors */
 932         if ((status & R1_CARD_ECC_FAILED) ||
 933             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 934             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 935                 *ecc_err = 1;
 936
 937         /* Flag General errors */
 938         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 939                 if ((status & R1_ERROR) ||
 940                         (brq->stop.resp[0] & R1_ERROR)) {
 941                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 942                                req->rq_disk->disk_name, __func__,
 943                                brq->stop.resp[0], status);
 944                         *gen_err = 1;
 945                 }
 946
 947         /*
 948          * Check the current card state.  If it is in some data transfer
 949          * mode, tell it to stop (and hopefully transition back to TRAN.)
 950          */
 951         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 952             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 953                 err = send_stop(card,
 954                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
 955                         req, gen_err, &stop_status);
 956                 if (err) {
 957                         pr_err("%s: error %d sending stop command\n",
 958                                req->rq_disk->disk_name, err);
 959                         /*
 960                          * If the stop cmd also timed out, the card is probably
 961                          * not present, so abort. Other errors are bad news too.
 962                          */
 963                         return ERR_ABORT;
 964                 }
 965
 966                 if (stop_status & R1_CARD_ECC_FAILED)
 967                         *ecc_err = 1;
 968         }
 969
 970         /* Check for set block count errors */
 971         if (brq->sbc.error)
 972                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 973                                 prev_cmd_status_valid, status);
 974
 975         /* Check for r/w command errors */
 976         if (brq->cmd.error)
 977                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 978                                 prev_cmd_status_valid, status);
 979
 980         /* Data errors */
 981         if (!brq->stop.error)
 982                 return ERR_CONTINUE;
 983
 984         /* Now for stop errors.  These aren't fatal to the transfer. */
 985         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 986                req->rq_disk->disk_name, brq->stop.error,
 987                brq->cmd.resp[0], status);
 988
 989         /*
 990          * Subsitute in our own stop status as this will give the error
 991          * state which happened during the execution of the r/w command.
 992          */
 993         if (stop_status) {
 994                 brq->stop.resp[0] = stop_status;
 995                 brq->stop.error = 0;
 996         }
 997         return ERR_CONTINUE;
 998 }
 999
1000 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1001                          int type)
1002 {
1003         int err;
1004
1005         if (md->reset_done & type)
1006                 return -EEXIST;
1007
1008         md->reset_done |= type;
1009         err = mmc_hw_reset(host);
1010         /* Ensure we switch back to the correct partition */
1011         if (err != -EOPNOTSUPP) {
1012                 struct mmc_blk_data *main_md =
1013                         dev_get_drvdata(&host->card->dev);
1014                 int part_err;
1015
1016                 main_md->part_curr = main_md->part_type;
1017                 part_err = mmc_blk_part_switch(host->card, md);
1018                 if (part_err) {
1019                         /*
1020                          * We have failed to get back into the correct
1021                          * partition, so we need to abort the whole request.
1022                          */
1023                         return -ENODEV;
1024                 }
1025         }
1026         return err;
1027 }
1028
1029 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1030 {
1031         md->reset_done &= ~type;
1032 }
1033
1034 int mmc_access_rpmb(struct mmc_queue *mq)
1035 {
1036         struct mmc_blk_data *md = mq->data;
1037         /*
1038          * If this is a RPMB partition access, return ture
1039          */
1040         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1041                 return true;
1042
1043         return false;
1044 }
1045
1046 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1047 {
1048         struct mmc_blk_data *md = mq->data;
1049         struct mmc_card *card = md->queue.card;
1050         unsigned int from, nr, arg;
1051         int err = 0, type = MMC_BLK_DISCARD;
1052
1053         if (!mmc_can_erase(card)) {
1054                 err = -EOPNOTSUPP;
1055                 goto out;
1056         }
1057
1058         from = blk_rq_pos(req);
1059         nr = blk_rq_sectors(req);
1060
1061         if (mmc_can_discard(card))
1062                 arg = MMC_DISCARD_ARG;
1063         else if (mmc_can_trim(card))
1064                 arg = MMC_TRIM_ARG;
1065         else
1066                 arg = MMC_ERASE_ARG;
1067 retry:
1068         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1069                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1070                                  INAND_CMD38_ARG_EXT_CSD,
1071                                  arg == MMC_TRIM_ARG ?
1072                                  INAND_CMD38_ARG_TRIM :
1073                                  INAND_CMD38_ARG_ERASE,
1074                                  0);
1075                 if (err)
1076                         goto out;
1077         }
1078         err = mmc_erase(card, from, nr, arg);
1079 out:
1080         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1081                 goto retry;
1082         if (!err)
1083                 mmc_blk_reset_success(md, type);
1084         blk_end_request(req, err, blk_rq_bytes(req));
1085
1086         return err ? 0 : 1;
1087 }
1088
1089 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1090                                        struct request *req)
1091 {
1092         struct mmc_blk_data *md = mq->data;
1093         struct mmc_card *card = md->queue.card;
1094         unsigned int from, nr, arg;
1095         int err = 0, type = MMC_BLK_SECDISCARD;
1096
1097         if (!(mmc_can_secure_erase_trim(card))) {
1098                 err = -EOPNOTSUPP;
1099                 goto out;
1100         }
1101
1102         from = blk_rq_pos(req);
1103         nr = blk_rq_sectors(req);
1104
1105         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1106                 arg = MMC_SECURE_TRIM1_ARG;
1107         else
1108                 arg = MMC_SECURE_ERASE_ARG;
1109
1110 retry:
1111         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1112                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1113                                  INAND_CMD38_ARG_EXT_CSD,
1114                                  arg == MMC_SECURE_TRIM1_ARG ?
1115                                  INAND_CMD38_ARG_SECTRIM1 :
1116                                  INAND_CMD38_ARG_SECERASE,
1117                                  0);
1118                 if (err)
1119                         goto out_retry;
1120         }
1121
1122         err = mmc_erase(card, from, nr, arg);
1123         if (err == -EIO)
1124                 goto out_retry;
1125         if (err)
1126                 goto out;
1127
1128         if (arg == MMC_SECURE_TRIM1_ARG) {
1129                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1130                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1131                                          INAND_CMD38_ARG_EXT_CSD,
1132                                          INAND_CMD38_ARG_SECTRIM2,
1133                                          0);
1134                         if (err)
1135                                 goto out_retry;
1136                 }
1137
1138                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1139                 if (err == -EIO)
1140                         goto out_retry;
1141                 if (err)
1142                         goto out;
1143         }
1144
1145 out_retry:
1146         if (err && !mmc_blk_reset(md, card->host, type))
1147                 goto retry;
1148         if (!err)
1149                 mmc_blk_reset_success(md, type);
1150 out:
1151         blk_end_request(req, err, blk_rq_bytes(req));
1152
1153         return err ? 0 : 1;
1154 }
1155
1156 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1157 {
1158         struct mmc_blk_data *md = mq->data;
1159         struct mmc_card *card = md->queue.card;
1160         int ret = 0;
1161
1162         ret = mmc_flush_cache(card);
1163         if (ret)
1164                 ret = -EIO;
1165
1166         blk_end_request_all(req, ret);
1167
1168         return ret ? 0 : 1;
1169 }
1170
1171 /*
1172  * Reformat current write as a reliable write, supporting
1173  * both legacy and the enhanced reliable write MMC cards.
1174  * In each transfer we'll handle only as much as a single
1175  * reliable write can handle, thus finish the request in
1176  * partial completions.
1177  */
1178 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1179                                     struct mmc_card *card,
1180                                     struct request *req)
1181 {
1182         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1183                 /* Legacy mode imposes restrictions on transfers. */
1184                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1185                         brq->data.blocks = 1;
1186
1187                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1188                         brq->data.blocks = card->ext_csd.rel_sectors;
1189                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1190                         brq->data.blocks = 1;
1191         }
1192 }
1193
1194 #define CMD_ERRORS                                                      \
1195         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1196          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1197          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1198          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1199          R1_CC_ERROR |          /* Card controller error */             \
1200          R1_ERROR)              /* General/unknown error */
1201
1202 static int mmc_blk_err_check(struct mmc_card *card,
1203                              struct mmc_async_req *areq)
1204 {
1205         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1206                                                     mmc_active);
1207         struct mmc_blk_request *brq = &mq_mrq->brq;
1208         struct request *req = mq_mrq->req;
1209         int ecc_err = 0, gen_err = 0;
1210
1211         /*
1212          * sbc.error indicates a problem with the set block count
1213          * command.  No data will have been transferred.
1214          *
1215          * cmd.error indicates a problem with the r/w command.  No
1216          * data will have been transferred.
1217          *
1218          * stop.error indicates a problem with the stop command.  Data
1219          * may have been transferred, or may still be transferring.
1220          */
1221         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1222             brq->data.error) {
1223                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1224                 case ERR_RETRY:
1225                         return MMC_BLK_RETRY;
1226                 case ERR_ABORT:
1227                         return MMC_BLK_ABORT;
1228                 case ERR_NOMEDIUM:
1229                         return MMC_BLK_NOMEDIUM;
1230                 case ERR_CONTINUE:
1231                         break;
1232                 }
1233         }
1234
1235         /*
1236          * Check for errors relating to the execution of the
1237          * initial command - such as address errors.  No data
1238          * has been transferred.
1239          */
1240         if (brq->cmd.resp[0] & CMD_ERRORS) {
1241                 pr_err("%s: r/w command failed, status = %#x\n",
1242                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1243                 return MMC_BLK_ABORT;
1244         }
1245
1246         /*
1247          * Everything else is either success, or a data error of some
1248          * kind.  If it was a write, we may have transitioned to
1249          * program mode, which we have to wait for it to complete.
1250          */
1251         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1252                 int err;
1253
1254                 /* Check stop command response */
1255                 if (brq->stop.resp[0] & R1_ERROR) {
1256                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1257                                req->rq_disk->disk_name, __func__,
1258                                brq->stop.resp[0]);
1259                         gen_err = 1;
1260                 }
1261
1262                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1263                                         &gen_err);
1264                 if (err)
1265                         return MMC_BLK_CMD_ERR;
1266         }
1267
1268         /* if general error occurs, retry the write operation. */
1269         if (gen_err) {
1270                 pr_warn("%s: retrying write for general error\n",
1271                                 req->rq_disk->disk_name);
1272                 return MMC_BLK_RETRY;
1273         }
1274
1275         if (brq->data.error) {
1276                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1277                        req->rq_disk->disk_name, brq->data.error,
1278                        (unsigned)blk_rq_pos(req),
1279                        (unsigned)blk_rq_sectors(req),
1280                        brq->cmd.resp[0], brq->stop.resp[0]);
1281
1282                 if (rq_data_dir(req) == READ) {
1283                         if (ecc_err)
1284                                 return MMC_BLK_ECC_ERR;
1285                         return MMC_BLK_DATA_ERR;
1286                 } else {
1287                         return MMC_BLK_CMD_ERR;
1288                 }
1289         }
1290
1291         if (!brq->data.bytes_xfered)
1292                 return MMC_BLK_RETRY;
1293
1294         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1295                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1296                         return MMC_BLK_PARTIAL;
1297                 else
1298                         return MMC_BLK_SUCCESS;
1299         }
1300
1301         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1302                 return MMC_BLK_PARTIAL;
1303
1304         return MMC_BLK_SUCCESS;
1305 }
1306
1307 static int mmc_blk_packed_err_check(struct mmc_card *card,
1308                                     struct mmc_async_req *areq)
1309 {
1310         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1311                         mmc_active);
1312         struct request *req = mq_rq->req;
1313         struct mmc_packed *packed = mq_rq->packed;
1314         int err, check, status;
1315         u8 *ext_csd;
1316
1317         BUG_ON(!packed);
1318
1319         packed->retries--;
1320         check = mmc_blk_err_check(card, areq);
1321         err = get_card_status(card, &status, 0);
1322         if (err) {
1323                 pr_err("%s: error %d sending status command\n",
1324                        req->rq_disk->disk_name, err);
1325                 return MMC_BLK_ABORT;
1326         }
1327
1328         if (status & R1_EXCEPTION_EVENT) {
1329                 err = mmc_get_ext_csd(card, &ext_csd);
1330                 if (err) {
1331                         pr_err("%s: error %d sending ext_csd\n",
1332                                req->rq_disk->disk_name, err);
1333                         return MMC_BLK_ABORT;
1334                 }
1335
1336                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1337                      EXT_CSD_PACKED_FAILURE) &&
1338                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1339                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1340                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1341                             EXT_CSD_PACKED_INDEXED_ERROR) {
1342                                 packed->idx_failure =
1343                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1344                                 check = MMC_BLK_PARTIAL;
1345                         }
1346                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1347                                "failure index: %d\n",
1348                                req->rq_disk->disk_name, packed->nr_entries,
1349                                packed->blocks, packed->idx_failure);
1350                 }
1351                 kfree(ext_csd);
1352         }
1353
1354         return check;
1355 }
1356
1357 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1358                                struct mmc_card *card,
1359                                int disable_multi,
1360                                struct mmc_queue *mq)
1361 {
1362         u32 readcmd, writecmd;
1363         struct mmc_blk_request *brq = &mqrq->brq;
1364         struct request *req = mqrq->req;
1365         struct mmc_blk_data *md = mq->data;
1366         bool do_data_tag;
1367
1368         /*
1369          * Reliable writes are used to implement Forced Unit Access and
1370          * REQ_META accesses, and are supported only on MMCs.
1371          *
1372          * XXX: this really needs a good explanation of why REQ_META
1373          * is treated special.
1374          */
1375         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1376                           (req->cmd_flags & REQ_META)) &&
1377                 (rq_data_dir(req) == WRITE) &&
1378                 (md->flags & MMC_BLK_REL_WR);
1379
1380         memset(brq, 0, sizeof(struct mmc_blk_request));
1381         brq->mrq.cmd = &brq->cmd;
1382         brq->mrq.data = &brq->data;
1383
1384         brq->cmd.arg = blk_rq_pos(req);
1385         if (!mmc_card_blockaddr(card))
1386                 brq->cmd.arg <<= 9;
1387         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1388         brq->data.blksz = 512;
1389         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1390         brq->stop.arg = 0;
1391         brq->data.blocks = blk_rq_sectors(req);
1392
1393         /*
1394          * The block layer doesn't support all sector count
1395          * restrictions, so we need to be prepared for too big
1396          * requests.
1397          */
1398         if (brq->data.blocks > card->host->max_blk_count)
1399                 brq->data.blocks = card->host->max_blk_count;
1400
1401         if (brq->data.blocks > 1) {
1402                 /*
1403                  * After a read error, we redo the request one sector
1404                  * at a time in order to accurately determine which
1405                  * sectors can be read successfully.
1406                  */
1407                 if (disable_multi)
1408                         brq->data.blocks = 1;
1409
1410                 /*
1411                  * Some controllers have HW issues while operating
1412                  * in multiple I/O mode
1413                  */
1414                 if (card->host->ops->multi_io_quirk)
1415                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1416                                                 (rq_data_dir(req) == READ) ?
1417                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1418                                                 brq->data.blocks);
1419         }
1420
1421         if (brq->data.blocks > 1 || do_rel_wr) {
1422                 /* SPI multiblock writes terminate using a special
1423                  * token, not a STOP_TRANSMISSION request.
1424                  */
1425                 if (!mmc_host_is_spi(card->host) ||
1426                     rq_data_dir(req) == READ)
1427                         brq->mrq.stop = &brq->stop;
1428                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1429                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1430         } else {
1431                 brq->mrq.stop = NULL;
1432                 readcmd = MMC_READ_SINGLE_BLOCK;
1433                 writecmd = MMC_WRITE_BLOCK;
1434         }
1435         if (rq_data_dir(req) == READ) {
1436                 brq->cmd.opcode = readcmd;
1437                 brq->data.flags |= MMC_DATA_READ;
1438                 if (brq->mrq.stop)
1439                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1440                                         MMC_CMD_AC;
1441         } else {
1442                 brq->cmd.opcode = writecmd;
1443                 brq->data.flags |= MMC_DATA_WRITE;
1444                 if (brq->mrq.stop)
1445                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1446                                         MMC_CMD_AC;
1447         }
1448
1449         if (do_rel_wr)
1450                 mmc_apply_rel_rw(brq, card, req);
1451
1452         /*
1453          * Data tag is used only during writing meta data to speed
1454          * up write and any subsequent read of this meta data
1455          */
1456         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1457                 (req->cmd_flags & REQ_META) &&
1458                 (rq_data_dir(req) == WRITE) &&
1459                 ((brq->data.blocks * brq->data.blksz) >=
1460                  card->ext_csd.data_tag_unit_size);
1461
1462         /*
1463          * Pre-defined multi-block transfers are preferable to
1464          * open ended-ones (and necessary for reliable writes).
1465          * However, it is not sufficient to just send CMD23,
1466          * and avoid the final CMD12, as on an error condition
1467          * CMD12 (stop) needs to be sent anyway. This, coupled
1468          * with Auto-CMD23 enhancements provided by some
1469          * hosts, means that the complexity of dealing
1470          * with this is best left to the host. If CMD23 is
1471          * supported by card and host, we'll fill sbc in and let
1472          * the host deal with handling it correctly. This means
1473          * that for hosts that don't expose MMC_CAP_CMD23, no
1474          * change of behavior will be observed.
1475          *
1476          * N.B: Some MMC cards experience perf degradation.
1477          * We'll avoid using CMD23-bounded multiblock writes for
1478          * these, while retaining features like reliable writes.
1479          */
1480         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1481             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1482              do_data_tag)) {
1483                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1484                 brq->sbc.arg = brq->data.blocks |
1485                         (do_rel_wr ? (1 << 31) : 0) |
1486                         (do_data_tag ? (1 << 29) : 0);
1487                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1488                 brq->mrq.sbc = &brq->sbc;
1489         }
1490
1491         mmc_set_data_timeout(&brq->data, card);
1492
1493         brq->data.sg = mqrq->sg;
1494         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1495
1496         /*
1497          * Adjust the sg list so it is the same size as the
1498          * request.
1499          */
1500         if (brq->data.blocks != blk_rq_sectors(req)) {
1501                 int i, data_size = brq->data.blocks << 9;
1502                 struct scatterlist *sg;
1503
1504                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1505                         data_size -= sg->length;
1506                         if (data_size <= 0) {
1507                                 sg->length += data_size;
1508                                 i++;
1509                                 break;
1510                         }
1511                 }
1512                 brq->data.sg_len = i;
1513         }
1514
1515         mqrq->mmc_active.mrq = &brq->mrq;
1516         mqrq->mmc_active.err_check = mmc_blk_err_check;
1517
1518         mmc_queue_bounce_pre(mqrq);
1519 }
1520
1521 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1522                                           struct mmc_card *card)
1523 {
1524         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1525         unsigned int max_seg_sz = queue_max_segment_size(q);
1526         unsigned int len, nr_segs = 0;
1527
1528         do {
1529                 len = min(hdr_sz, max_seg_sz);
1530                 hdr_sz -= len;
1531                 nr_segs++;
1532         } while (hdr_sz);
1533
1534         return nr_segs;
1535 }
1536
1537 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1538 {
1539         struct request_queue *q = mq->queue;
1540         struct mmc_card *card = mq->card;
1541         struct request *cur = req, *next = NULL;
1542         struct mmc_blk_data *md = mq->data;
1543         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1544         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1545         unsigned int req_sectors = 0, phys_segments = 0;
1546         unsigned int max_blk_count, max_phys_segs;
1547         bool put_back = true;
1548         u8 max_packed_rw = 0;
1549         u8 reqs = 0;
1550
1551         if (!(md->flags & MMC_BLK_PACKED_CMD))
1552                 goto no_packed;
1553
1554         if ((rq_data_dir(cur) == WRITE) &&
1555             mmc_host_packed_wr(card->host))
1556                 max_packed_rw = card->ext_csd.max_packed_writes;
1557
1558         if (max_packed_rw == 0)
1559                 goto no_packed;
1560
1561         if (mmc_req_rel_wr(cur) &&
1562             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1563                 goto no_packed;
1564
1565         if (mmc_large_sector(card) &&
1566             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1567                 goto no_packed;
1568
1569         mmc_blk_clear_packed(mqrq);
1570
1571         max_blk_count = min(card->host->max_blk_count,
1572                             card->host->max_req_size >> 9);
1573         if (unlikely(max_blk_count > 0xffff))
1574                 max_blk_count = 0xffff;
1575
1576         max_phys_segs = queue_max_segments(q);
1577         req_sectors += blk_rq_sectors(cur);
1578         phys_segments += cur->nr_phys_segments;
1579
1580         if (rq_data_dir(cur) == WRITE) {
1581                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1582                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1583         }
1584
1585         do {
1586                 if (reqs >= max_packed_rw - 1) {
1587                         put_back = false;
1588                         break;
1589                 }
1590
1591                 spin_lock_irq(q->queue_lock);
1592                 next = blk_fetch_request(q);
1593                 spin_unlock_irq(q->queue_lock);
1594                 if (!next) {
1595                         put_back = false;
1596                         break;
1597                 }
1598
1599                 if (mmc_large_sector(card) &&
1600                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1601                         break;
1602
1603                 if (next->cmd_flags & REQ_DISCARD ||
1604                     next->cmd_flags & REQ_FLUSH)
1605                         break;
1606
1607                 if (rq_data_dir(cur) != rq_data_dir(next))
1608                         break;
1609
1610                 if (mmc_req_rel_wr(next) &&
1611                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1612                         break;
1613
1614                 req_sectors += blk_rq_sectors(next);
1615                 if (req_sectors > max_blk_count)
1616                         break;
1617
1618                 phys_segments +=  next->nr_phys_segments;
1619                 if (phys_segments > max_phys_segs)
1620                         break;
1621
1622                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1623                 cur = next;
1624                 reqs++;
1625         } while (1);
1626
1627         if (put_back) {
1628                 spin_lock_irq(q->queue_lock);
1629                 blk_requeue_request(q, next);
1630                 spin_unlock_irq(q->queue_lock);
1631         }
1632
1633         if (reqs > 0) {
1634                 list_add(&req->queuelist, &mqrq->packed->list);
1635                 mqrq->packed->nr_entries = ++reqs;
1636                 mqrq->packed->retries = reqs;
1637                 return reqs;
1638         }
1639
1640 no_packed:
1641         mqrq->cmd_type = MMC_PACKED_NONE;
1642         return 0;
1643 }
1644
1645 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1646                                         struct mmc_card *card,
1647                                         struct mmc_queue *mq)
1648 {
1649         struct mmc_blk_request *brq = &mqrq->brq;
1650         struct request *req = mqrq->req;
1651         struct request *prq;
1652         struct mmc_blk_data *md = mq->data;
1653         struct mmc_packed *packed = mqrq->packed;
1654         bool do_rel_wr, do_data_tag;
1655         u32 *packed_cmd_hdr;
1656         u8 hdr_blocks;
1657         u8 i = 1;
1658
1659         BUG_ON(!packed);
1660
1661         mqrq->cmd_type = MMC_PACKED_WRITE;
1662         packed->blocks = 0;
1663         packed->idx_failure = MMC_PACKED_NR_IDX;
1664
1665         packed_cmd_hdr = packed->cmd_hdr;
1666         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1667         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1668                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1669         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1670
1671         /*
1672          * Argument for each entry of packed group
1673          */
1674         list_for_each_entry(prq, &packed->list, queuelist) {
1675                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1676                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1677                         (prq->cmd_flags & REQ_META) &&
1678                         (rq_data_dir(prq) == WRITE) &&
1679                         ((brq->data.blocks * brq->data.blksz) >=
1680                          card->ext_csd.data_tag_unit_size);
1681                 /* Argument of CMD23 */
1682                 packed_cmd_hdr[(i * 2)] =
1683                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1684                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1685                         blk_rq_sectors(prq);
1686                 /* Argument of CMD18 or CMD25 */
1687                 packed_cmd_hdr[((i * 2)) + 1] =
1688                         mmc_card_blockaddr(card) ?
1689                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1690                 packed->blocks += blk_rq_sectors(prq);
1691                 i++;
1692         }
1693
1694         memset(brq, 0, sizeof(struct mmc_blk_request));
1695         brq->mrq.cmd = &brq->cmd;
1696         brq->mrq.data = &brq->data;
1697         brq->mrq.sbc = &brq->sbc;
1698         brq->mrq.stop = &brq->stop;
1699
1700         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1701         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1702         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1703
1704         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1705         brq->cmd.arg = blk_rq_pos(req);
1706         if (!mmc_card_blockaddr(card))
1707                 brq->cmd.arg <<= 9;
1708         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1709
1710         brq->data.blksz = 512;
1711         brq->data.blocks = packed->blocks + hdr_blocks;
1712         brq->data.flags |= MMC_DATA_WRITE;
1713
1714         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1715         brq->stop.arg = 0;
1716         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1717
1718         mmc_set_data_timeout(&brq->data, card);
1719
1720         brq->data.sg = mqrq->sg;
1721         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1722
1723         mqrq->mmc_active.mrq = &brq->mrq;
1724         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1725
1726         mmc_queue_bounce_pre(mqrq);
1727 }
1728
1729 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1730                            struct mmc_blk_request *brq, struct request *req,
1731                            int ret)
1732 {
1733         struct mmc_queue_req *mq_rq;
1734         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1735
1736         /*
1737          * If this is an SD card and we're writing, we can first
1738          * mark the known good sectors as ok.
1739          *
1740          * If the card is not SD, we can still ok written sectors
1741          * as reported by the controller (which might be less than
1742          * the real number of written sectors, but never more).
1743          */
1744         if (mmc_card_sd(card)) {
1745                 u32 blocks;
1746
1747                 blocks = mmc_sd_num_wr_blocks(card);
1748                 if (blocks != (u32)-1) {
1749                         ret = blk_end_request(req, 0, blocks << 9);
1750                 }
1751         } else {
1752                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1753                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1754         }
1755         return ret;
1756 }
1757
1758 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1759 {
1760         struct request *prq;
1761         struct mmc_packed *packed = mq_rq->packed;
1762         int idx = packed->idx_failure, i = 0;
1763         int ret = 0;
1764
1765         BUG_ON(!packed);
1766
1767         while (!list_empty(&packed->list)) {
1768                 prq = list_entry_rq(packed->list.next);
1769                 if (idx == i) {
1770                         /* retry from error index */
1771                         packed->nr_entries -= idx;
1772                         mq_rq->req = prq;
1773                         ret = 1;
1774
1775                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1776                                 list_del_init(&prq->queuelist);
1777                                 mmc_blk_clear_packed(mq_rq);
1778                         }
1779                         return ret;
1780                 }
1781                 list_del_init(&prq->queuelist);
1782                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1783                 i++;
1784         }
1785
1786         mmc_blk_clear_packed(mq_rq);
1787         return ret;
1788 }
1789
1790 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1791 {
1792         struct request *prq;
1793         struct mmc_packed *packed = mq_rq->packed;
1794
1795         BUG_ON(!packed);
1796
1797         while (!list_empty(&packed->list)) {
1798                 prq = list_entry_rq(packed->list.next);
1799                 list_del_init(&prq->queuelist);
1800                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1801         }
1802
1803         mmc_blk_clear_packed(mq_rq);
1804 }
1805
1806 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1807                                       struct mmc_queue_req *mq_rq)
1808 {
1809         struct request *prq;
1810         struct request_queue *q = mq->queue;
1811         struct mmc_packed *packed = mq_rq->packed;
1812
1813         BUG_ON(!packed);
1814
1815         while (!list_empty(&packed->list)) {
1816                 prq = list_entry_rq(packed->list.prev);
1817                 if (prq->queuelist.prev != &packed->list) {
1818                         list_del_init(&prq->queuelist);
1819                         spin_lock_irq(q->queue_lock);
1820                         blk_requeue_request(mq->queue, prq);
1821                         spin_unlock_irq(q->queue_lock);
1822                 } else {
1823                         list_del_init(&prq->queuelist);
1824                 }
1825         }
1826
1827         mmc_blk_clear_packed(mq_rq);
1828 }
1829
1830 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1831 {
1832         struct mmc_blk_data *md = mq->data;
1833         struct mmc_card *card = md->queue.card;
1834         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1835         int ret = 1, disable_multi = 0, retry = 0, type;
1836         enum mmc_blk_status status;
1837         struct mmc_queue_req *mq_rq;
1838         struct request *req = rqc;
1839         struct mmc_async_req *areq;
1840         const u8 packed_nr = 2;
1841         u8 reqs = 0;
1842
1843         if (!rqc && !mq->mqrq_prev->req)
1844                 return 0;
1845
1846         if (rqc)
1847                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1848
1849         do {
1850                 if (rqc) {
1851                         /*
1852                          * When 4KB native sector is enabled, only 8 blocks
1853                          * multiple read or write is allowed
1854                          */
1855                         if ((brq->data.blocks & 0x07) &&
1856                             (card->ext_csd.data_sector_size == 4096)) {
1857                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1858                                         req->rq_disk->disk_name);
1859                                 mq_rq = mq->mqrq_cur;
1860                                 goto cmd_abort;
1861                         }
1862
1863                         if (reqs >= packed_nr)
1864                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1865                                                             card, mq);
1866                         else
1867                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1868                         areq = &mq->mqrq_cur->mmc_active;
1869                 } else
1870                         areq = NULL;
1871                 areq = mmc_start_req(card->host, areq, (int *) &status);
1872                 if (!areq) {
1873                         if (status == MMC_BLK_NEW_REQUEST)
1874                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1875                         return 0;
1876                 }
1877
1878                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1879                 brq = &mq_rq->brq;
1880                 req = mq_rq->req;
1881                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1882                 mmc_queue_bounce_post(mq_rq);
1883
1884                 switch (status) {
1885                 case MMC_BLK_SUCCESS:
1886                 case MMC_BLK_PARTIAL:
1887                         /*
1888                          * A block was successfully transferred.
1889                          */
1890                         mmc_blk_reset_success(md, type);
1891
1892                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1893                                 ret = mmc_blk_end_packed_req(mq_rq);
1894                                 break;
1895                         } else {
1896                                 ret = blk_end_request(req, 0,
1897                                                 brq->data.bytes_xfered);
1898                         }
1899
1900                         /*
1901                          * If the blk_end_request function returns non-zero even
1902                          * though all data has been transferred and no errors
1903                          * were returned by the host controller, it's a bug.
1904                          */
1905                         if (status == MMC_BLK_SUCCESS && ret) {
1906                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1907                                        __func__, blk_rq_bytes(req),
1908                                        brq->data.bytes_xfered);
1909                                 rqc = NULL;
1910                                 goto cmd_abort;
1911                         }
1912                         break;
1913                 case MMC_BLK_CMD_ERR:
1914                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1915                         if (mmc_blk_reset(md, card->host, type))
1916                                 goto cmd_abort;
1917                         if (!ret)
1918                                 goto start_new_req;
1919                         break;
1920                 case MMC_BLK_RETRY:
1921                         if (retry++ < 5)
1922                                 break;
1923                         /* Fall through */
1924                 case MMC_BLK_ABORT:
1925                         if (!mmc_blk_reset(md, card->host, type))
1926                                 break;
1927                         goto cmd_abort;
1928                 case MMC_BLK_DATA_ERR: {
1929                         int err;
1930
1931                         err = mmc_blk_reset(md, card->host, type);
1932                         if (!err)
1933                                 break;
1934                         if (err == -ENODEV ||
1935                                 mmc_packed_cmd(mq_rq->cmd_type))
1936                                 goto cmd_abort;
1937                         /* Fall through */
1938                 }
1939                 case MMC_BLK_ECC_ERR:
1940                         if (brq->data.blocks > 1) {
1941                                 /* Redo read one sector at a time */
1942                                 pr_warn("%s: retrying using single block read\n",
1943                                         req->rq_disk->disk_name);
1944                                 disable_multi = 1;
1945                                 break;
1946                         }
1947                         /*
1948                          * After an error, we redo I/O one sector at a
1949                          * time, so we only reach here after trying to
1950                          * read a single sector.
1951                          */
1952                         ret = blk_end_request(req, -EIO,
1953                                                 brq->data.blksz);
1954                         if (!ret)
1955                                 goto start_new_req;
1956                         break;
1957                 case MMC_BLK_NOMEDIUM:
1958                         goto cmd_abort;
1959                 default:
1960                         pr_err("%s: Unhandled return value (%d)",
1961                                         req->rq_disk->disk_name, status);
1962                         goto cmd_abort;
1963                 }
1964
1965                 if (ret) {
1966                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1967                                 if (!mq_rq->packed->retries)
1968                                         goto cmd_abort;
1969                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1970                                 mmc_start_req(card->host,
1971                                               &mq_rq->mmc_active, NULL);
1972                         } else {
1973
1974                                 /*
1975                                  * In case of a incomplete request
1976                                  * prepare it again and resend.
1977                                  */
1978                                 mmc_blk_rw_rq_prep(mq_rq, card,
1979                                                 disable_multi, mq);
1980                                 mmc_start_req(card->host,
1981                                                 &mq_rq->mmc_active, NULL);
1982                         }
1983                 }
1984         } while (ret);
1985
1986         return 1;
1987
1988  cmd_abort:
1989         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1990                 mmc_blk_abort_packed_req(mq_rq);
1991         } else {
1992                 if (mmc_card_removed(card))
1993                         req->cmd_flags |= REQ_QUIET;
1994                 while (ret)
1995                         ret = blk_end_request(req, -EIO,
1996                                         blk_rq_cur_bytes(req));
1997         }
1998
1999  start_new_req:
2000         if (rqc) {
2001                 if (mmc_card_removed(card)) {
2002                         rqc->cmd_flags |= REQ_QUIET;
2003                         blk_end_request_all(rqc, -EIO);
2004                 } else {
2005                         /*
2006                          * If current request is packed, it needs to put back.
2007                          */
2008                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2009                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2010
2011                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2012                         mmc_start_req(card->host,
2013                                       &mq->mqrq_cur->mmc_active, NULL);
2014                 }
2015         }
2016
2017         return 0;
2018 }
2019
2020 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2021 {
2022         int ret;
2023         struct mmc_blk_data *md = mq->data;
2024         struct mmc_card *card = md->queue.card;
2025         struct mmc_host *host = card->host;
2026         unsigned long flags;
2027         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2028
2029         if (req && !mq->mqrq_prev->req)
2030                 /* claim host only for the first request */
2031                 mmc_get_card(card);
2032
2033         ret = mmc_blk_part_switch(card, md);
2034         if (ret) {
2035                 if (req) {
2036                         blk_end_request_all(req, -EIO);
2037                 }
2038                 ret = 0;
2039                 goto out;
2040         }
2041
2042         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2043         if (cmd_flags & REQ_DISCARD) {
2044                 /* complete ongoing async transfer before issuing discard */
2045                 if (card->host->areq)
2046                         mmc_blk_issue_rw_rq(mq, NULL);
2047                 if (req->cmd_flags & REQ_SECURE)
2048                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2049                 else
2050                         ret = mmc_blk_issue_discard_rq(mq, req);
2051         } else if (cmd_flags & REQ_FLUSH) {
2052                 /* complete ongoing async transfer before issuing flush */
2053                 if (card->host->areq)
2054                         mmc_blk_issue_rw_rq(mq, NULL);
2055                 ret = mmc_blk_issue_flush(mq, req);
2056         } else {
2057                 if (!req && host->areq) {
2058                         spin_lock_irqsave(&host->context_info.lock, flags);
2059                         host->context_info.is_waiting_last_req = true;
2060                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2061                 }
2062                 ret = mmc_blk_issue_rw_rq(mq, req);
2063         }
2064
2065 out:
2066         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2067              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2068                 /*
2069                  * Release host when there are no more requests
2070                  * and after special request(discard, flush) is done.
2071                  * In case sepecial request, there is no reentry to
2072                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2073                  */
2074                 mmc_put_card(card);
2075         return ret;
2076 }
2077
2078 static inline int mmc_blk_readonly(struct mmc_card *card)
2079 {
2080         return mmc_card_readonly(card) ||
2081                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2082 }
2083
2084 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2085                                               struct device *parent,
2086                                               sector_t size,
2087                                               bool default_ro,
2088                                               const char *subname,
2089                                               int area_type)
2090 {
2091         struct mmc_blk_data *md;
2092         int devidx, ret;
2093
2094         devidx = find_first_zero_bit(dev_use, max_devices);
2095         if (devidx >= max_devices)
2096                 return ERR_PTR(-ENOSPC);
2097         __set_bit(devidx, dev_use);
2098
2099         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2100         if (!md) {
2101                 ret = -ENOMEM;
2102                 goto out;
2103         }
2104
2105         /*
2106          * !subname implies we are creating main mmc_blk_data that will be
2107          * associated with mmc_card with dev_set_drvdata. Due to device
2108          * partitions, devidx will not coincide with a per-physical card
2109          * index anymore so we keep track of a name index.
2110          */
2111         if (!subname) {
2112                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2113                 __set_bit(md->name_idx, name_use);
2114         } else
2115                 md->name_idx = ((struct mmc_blk_data *)
2116                                 dev_to_disk(parent)->private_data)->name_idx;
2117
2118         md->area_type = area_type;
2119
2120         /*
2121          * Set the read-only status based on the supported commands
2122          * and the write protect switch.
2123          */
2124         md->read_only = mmc_blk_readonly(card);
2125
2126         md->disk = alloc_disk(perdev_minors);
2127         if (md->disk == NULL) {
2128                 ret = -ENOMEM;
2129                 goto err_kfree;
2130         }
2131
2132         spin_lock_init(&md->lock);
2133         INIT_LIST_HEAD(&md->part);
2134         md->usage = 1;
2135
2136         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2137         if (ret)
2138                 goto err_putdisk;
2139
2140         md->queue.issue_fn = mmc_blk_issue_rq;
2141         md->queue.data = md;
2142
2143         md->disk->major = MMC_BLOCK_MAJOR;
2144         md->disk->first_minor = devidx * perdev_minors;
2145         md->disk->fops = &mmc_bdops;
2146         md->disk->private_data = md;
2147         md->disk->queue = md->queue.queue;
2148         md->disk->driverfs_dev = parent;
2149         set_disk_ro(md->disk, md->read_only || default_ro);
2150         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2151                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2152
2153         /*
2154          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2155          *
2156          * - be set for removable media with permanent block devices
2157          * - be unset for removable block devices with permanent media
2158          *
2159          * Since MMC block devices clearly fall under the second
2160          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2161          * should use the block device creation/destruction hotplug
2162          * messages to tell when the card is present.
2163          */
2164
2165         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2166                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2167
2168         if (mmc_card_mmc(card))
2169                 blk_queue_logical_block_size(md->queue.queue,
2170                                              card->ext_csd.data_sector_size);
2171         else
2172                 blk_queue_logical_block_size(md->queue.queue, 512);
2173
2174         set_capacity(md->disk, size);
2175
2176         if (mmc_host_cmd23(card->host)) {
2177                 if (mmc_card_mmc(card) ||
2178                     (mmc_card_sd(card) &&
2179                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2180                         md->flags |= MMC_BLK_CMD23;
2181         }
2182
2183         if (mmc_card_mmc(card) &&
2184             md->flags & MMC_BLK_CMD23 &&
2185             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2186              card->ext_csd.rel_sectors)) {
2187                 md->flags |= MMC_BLK_REL_WR;
2188                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2189         }
2190
2191         if (mmc_card_mmc(card) &&
2192             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2193             (md->flags & MMC_BLK_CMD23) &&
2194             card->ext_csd.packed_event_en) {
2195                 if (!mmc_packed_init(&md->queue, card))
2196                         md->flags |= MMC_BLK_PACKED_CMD;
2197         }
2198
2199         return md;
2200
2201  err_putdisk:
2202         put_disk(md->disk);
2203  err_kfree:
2204         kfree(md);
2205  out:
2206         return ERR_PTR(ret);
2207 }
2208
2209 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2210 {
2211         sector_t size;
2212
2213         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2214                 /*
2215                  * The EXT_CSD sector count is in number or 512 byte
2216                  * sectors.
2217                  */
2218                 size = card->ext_csd.sectors;
2219         } else {
2220                 /*
2221                  * The CSD capacity field is in units of read_blkbits.
2222                  * set_capacity takes units of 512 bytes.
2223                  */
2224                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2225         }
2226
2227         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2228                                         MMC_BLK_DATA_AREA_MAIN);
2229 }
2230
2231 static int mmc_blk_alloc_part(struct mmc_card *card,
2232                               struct mmc_blk_data *md,
2233                               unsigned int part_type,
2234                               sector_t size,
2235                               bool default_ro,
2236                               const char *subname,
2237                               int area_type)
2238 {
2239         char cap_str[10];
2240         struct mmc_blk_data *part_md;
2241
2242         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2243                                     subname, area_type);
2244         if (IS_ERR(part_md))
2245                 return PTR_ERR(part_md);
2246         part_md->part_type = part_type;
2247         list_add(&part_md->part, &md->part);
2248
2249         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2250                         cap_str, sizeof(cap_str));
2251         pr_info("%s: %s %s partition %u %s\n",
2252                part_md->disk->disk_name, mmc_card_id(card),
2253                mmc_card_name(card), part_md->part_type, cap_str);
2254         return 0;
2255 }
2256
2257 /* MMC Physical partitions consist of two boot partitions and
2258  * up to four general purpose partitions.
2259  * For each partition enabled in EXT_CSD a block device will be allocatedi
2260  * to provide access to the partition.
2261  */
2262
2263 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2264 {
2265         int idx, ret = 0;
2266
2267         if (!mmc_card_mmc(card))
2268                 return 0;
2269
2270         for (idx = 0; idx < card->nr_parts; idx++) {
2271                 if (card->part[idx].size) {
2272                         ret = mmc_blk_alloc_part(card, md,
2273                                 card->part[idx].part_cfg,
2274                                 card->part[idx].size >> 9,
2275                                 card->part[idx].force_ro,
2276                                 card->part[idx].name,
2277                                 card->part[idx].area_type);
2278                         if (ret)
2279                                 return ret;
2280                 }
2281         }
2282
2283         return ret;
2284 }
2285
2286 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2287 {
2288         struct mmc_card *card;
2289
2290         if (md) {
2291                 /*
2292                  * Flush remaining requests and free queues. It
2293                  * is freeing the queue that stops new requests
2294                  * from being accepted.
2295                  */
2296                 card = md->queue.card;
2297                 mmc_cleanup_queue(&md->queue);
2298                 if (md->flags & MMC_BLK_PACKED_CMD)
2299                         mmc_packed_clean(&md->queue);
2300                 if (md->disk->flags & GENHD_FL_UP) {
2301                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2302                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2303                                         card->ext_csd.boot_ro_lockable)
2304                                 device_remove_file(disk_to_dev(md->disk),
2305                                         &md->power_ro_lock);
2306
2307                         del_gendisk(md->disk);
2308                 }
2309                 mmc_blk_put(md);
2310         }
2311 }
2312
2313 static void mmc_blk_remove_parts(struct mmc_card *card,
2314                                  struct mmc_blk_data *md)
2315 {
2316         struct list_head *pos, *q;
2317         struct mmc_blk_data *part_md;
2318
2319         __clear_bit(md->name_idx, name_use);
2320         list_for_each_safe(pos, q, &md->part) {
2321                 part_md = list_entry(pos, struct mmc_blk_data, part);
2322                 list_del(pos);
2323                 mmc_blk_remove_req(part_md);
2324         }
2325 }
2326
2327 static int mmc_add_disk(struct mmc_blk_data *md)
2328 {
2329         int ret;
2330         struct mmc_card *card = md->queue.card;
2331
2332         add_disk(md->disk);
2333         md->force_ro.show = force_ro_show;
2334         md->force_ro.store = force_ro_store;
2335         sysfs_attr_init(&md->force_ro.attr);
2336         md->force_ro.attr.name = "force_ro";
2337         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2338         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2339         if (ret)
2340                 goto force_ro_fail;
2341
2342         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2343              card->ext_csd.boot_ro_lockable) {
2344                 umode_t mode;
2345
2346                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2347                         mode = S_IRUGO;
2348                 else
2349                         mode = S_IRUGO | S_IWUSR;
2350
2351                 md->power_ro_lock.show = power_ro_lock_show;
2352                 md->power_ro_lock.store = power_ro_lock_store;
2353                 sysfs_attr_init(&md->power_ro_lock.attr);
2354                 md->power_ro_lock.attr.mode = mode;
2355                 md->power_ro_lock.attr.name =
2356                                         "ro_lock_until_next_power_on";
2357                 ret = device_create_file(disk_to_dev(md->disk),
2358                                 &md->power_ro_lock);
2359                 if (ret)
2360                         goto power_ro_lock_fail;
2361         }
2362         return ret;
2363
2364 power_ro_lock_fail:
2365         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2366 force_ro_fail:
2367         del_gendisk(md->disk);
2368
2369         return ret;
2370 }
2371
2372 #define CID_MANFID_SANDISK      0x2
2373 #define CID_MANFID_TOSHIBA      0x11
2374 #define CID_MANFID_MICRON       0x13
2375 #define CID_MANFID_SAMSUNG      0x15
2376
2377 static const struct mmc_fixup blk_fixups[] =
2378 {
2379         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2380                   MMC_QUIRK_INAND_CMD38),
2381         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2382                   MMC_QUIRK_INAND_CMD38),
2383         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2384                   MMC_QUIRK_INAND_CMD38),
2385         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2386                   MMC_QUIRK_INAND_CMD38),
2387         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2388                   MMC_QUIRK_INAND_CMD38),
2389
2390         /*
2391          * Some MMC cards experience performance degradation with CMD23
2392          * instead of CMD12-bounded multiblock transfers. For now we'll
2393          * black list what's bad...
2394          * - Certain Toshiba cards.
2395          *
2396          * N.B. This doesn't affect SD cards.
2397          */
2398         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2399                   MMC_QUIRK_BLK_NO_CMD23),
2400         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2401                   MMC_QUIRK_BLK_NO_CMD23),
2402         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2403                   MMC_QUIRK_BLK_NO_CMD23),
2404
2405         /*
2406          * Some Micron MMC cards needs longer data read timeout than
2407          * indicated in CSD.
2408          */
2409         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2410                   MMC_QUIRK_LONG_READ_TIME),
2411
2412         /*
2413          * On these Samsung MoviNAND parts, performing secure erase or
2414          * secure trim can result in unrecoverable corruption due to a
2415          * firmware bug.
2416          */
2417         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2418                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2419         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2420                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2421         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2422                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2423         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2424                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2425         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2426                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2427         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2428                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2429         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2430                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2431         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2432                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2433
2434         END_FIXUP
2435 };
2436
2437 static int mmc_blk_probe(struct mmc_card *card)
2438 {
2439         struct mmc_blk_data *md, *part_md;
2440         char cap_str[10];
2441
2442         /*
2443          * Check that the card supports the command class(es) we need.
2444          */
2445         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2446                 return -ENODEV;
2447
2448         mmc_fixup_device(card, blk_fixups);
2449
2450         md = mmc_blk_alloc(card);
2451         if (IS_ERR(md))
2452                 return PTR_ERR(md);
2453
2454         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2455                         cap_str, sizeof(cap_str));
2456         pr_info("%s: %s %s %s %s\n",
2457                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2458                 cap_str, md->read_only ? "(ro)" : "");
2459
2460         if (mmc_blk_alloc_parts(card, md))
2461                 goto out;
2462
2463         dev_set_drvdata(&card->dev, md);
2464
2465         if (mmc_add_disk(md))
2466                 goto out;
2467
2468         list_for_each_entry(part_md, &md->part, part) {
2469                 if (mmc_add_disk(part_md))
2470                         goto out;
2471         }
2472
2473         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2474         pm_runtime_use_autosuspend(&card->dev);
2475
2476         /*
2477          * Don't enable runtime PM for SD-combo cards here. Leave that
2478          * decision to be taken during the SDIO init sequence instead.
2479          */
2480         if (card->type != MMC_TYPE_SD_COMBO) {
2481                 pm_runtime_set_active(&card->dev);
2482                 pm_runtime_enable(&card->dev);
2483         }
2484
2485         return 0;
2486
2487  out:
2488         mmc_blk_remove_parts(card, md);
2489         mmc_blk_remove_req(md);
2490         return 0;
2491 }
2492
2493 static void mmc_blk_remove(struct mmc_card *card)
2494 {
2495         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2496
2497         mmc_blk_remove_parts(card, md);
2498         pm_runtime_get_sync(&card->dev);
2499         mmc_claim_host(card->host);
2500         mmc_blk_part_switch(card, md);
2501         mmc_release_host(card->host);
2502         if (card->type != MMC_TYPE_SD_COMBO)
2503                 pm_runtime_disable(&card->dev);
2504         pm_runtime_put_noidle(&card->dev);
2505         mmc_blk_remove_req(md);
2506         dev_set_drvdata(&card->dev, NULL);
2507 }
2508
2509 static int _mmc_blk_suspend(struct mmc_card *card)
2510 {
2511         struct mmc_blk_data *part_md;
2512         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2513
2514         if (md) {
2515                 mmc_queue_suspend(&md->queue);
2516                 list_for_each_entry(part_md, &md->part, part) {
2517                         mmc_queue_suspend(&part_md->queue);
2518                 }
2519         }
2520         return 0;
2521 }
2522
2523 static void mmc_blk_shutdown(struct mmc_card *card)
2524 {
2525         _mmc_blk_suspend(card);
2526 }
2527
2528 #ifdef CONFIG_PM_SLEEP
2529 static int mmc_blk_suspend(struct device *dev)
2530 {
2531         struct mmc_card *card = mmc_dev_to_card(dev);
2532
2533         return _mmc_blk_suspend(card);
2534 }
2535
2536 static int mmc_blk_resume(struct device *dev)
2537 {
2538         struct mmc_blk_data *part_md;
2539         struct mmc_blk_data *md = dev_get_drvdata(dev);
2540
2541         if (md) {
2542                 /*
2543                  * Resume involves the card going into idle state,
2544                  * so current partition is always the main one.
2545                  */
2546                 md->part_curr = md->part_type;
2547                 mmc_queue_resume(&md->queue);
2548                 list_for_each_entry(part_md, &md->part, part) {
2549                         mmc_queue_resume(&part_md->queue);
2550                 }
2551         }
2552         return 0;
2553 }
2554 #endif
2555
2556 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2557
2558 static struct mmc_driver mmc_driver = {
2559         .drv            = {
2560                 .name   = "mmcblk",
2561                 .pm     = &mmc_blk_pm_ops,
2562         },
2563         .probe          = mmc_blk_probe,
2564         .remove         = mmc_blk_remove,
2565         .shutdown       = mmc_blk_shutdown,
2566 };
2567
2568 static int __init mmc_blk_init(void)
2569 {
2570         int res;
2571
2572         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2573                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2574
2575         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2576
2577         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2578         if (res)
2579                 goto out;
2580
2581         res = mmc_register_driver(&mmc_driver);
2582         if (res)
2583                 goto out2;
2584
2585         return 0;
2586  out2:
2587         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2588  out:
2589         return res;
2590 }
2591
2592 static void __exit mmc_blk_exit(void)
2593 {
2594         mmc_unregister_driver(&mmc_driver);
2595         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2596 }
2597
2598 module_init(mmc_blk_init);
2599 module_exit(mmc_blk_exit);
2600
2601 MODULE_LICENSE("GPL");
2602 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2603