drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50 #ifdef MODULE_PARAM_PREFIX
  51 #undef MODULE_PARAM_PREFIX
  52 #endif
  53 #define MODULE_PARAM_PREFIX "mmcblk."
  54
  55 #define INAND_CMD38_ARG_EXT_CSD  113
  56 #define INAND_CMD38_ARG_ERASE    0x00
  57 #define INAND_CMD38_ARG_TRIM     0x01
  58 #define INAND_CMD38_ARG_SECERASE 0x80
  59 #define INAND_CMD38_ARG_SECTRIM1 0x81
  60 #define INAND_CMD38_ARG_SECTRIM2 0x88
  61 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  62 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  63 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  64
  65 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
  66                                   (req->cmd_flags & REQ_META)) && \
  67                                   (rq_data_dir(req) == WRITE))
  68 #define PACKED_CMD_VER  0x01
  69 #define PACKED_CMD_WR   0x02
  70
  71 static DEFINE_MUTEX(block_mutex);
  72
  73 /*
  74  * The defaults come from config options but can be overriden by module
  75  * or bootarg options.
  76  */
  77 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  78
  79 /*
  80  * We've only got one major, so number of mmcblk devices is
  81  * limited to 256 / number of minors per device.
  82  */
  83 static int max_devices;
  84
  85 /* 256 minors, so at most 256 separate devices */
  86 static DECLARE_BITMAP(dev_use, 256);
  87 static DECLARE_BITMAP(name_use, 256);
  88
  89 /*
  90  * There is one mmc_blk_data per slot.
  91  */
  92 struct mmc_blk_data {
  93         spinlock_t      lock;
  94         struct gendisk  *disk;
  95         struct mmc_queue queue;
  96         struct list_head part;
  97
  98         unsigned int    flags;
  99 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 100 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 101 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 102
 103         unsigned int    usage;
 104         unsigned int    read_only;
 105         unsigned int    part_type;
 106         unsigned int    name_idx;
 107         unsigned int    reset_done;
 108 #define MMC_BLK_READ            BIT(0)
 109 #define MMC_BLK_WRITE           BIT(1)
 110 #define MMC_BLK_DISCARD         BIT(2)
 111 #define MMC_BLK_SECDISCARD      BIT(3)
 112
 113         /*
 114          * Only set in main mmc_blk_data associated
 115          * with mmc_card with mmc_set_drvdata, and keeps
 116          * track of the current selected device partition.
 117          */
 118         unsigned int    part_curr;
 119         struct device_attribute force_ro;
 120         struct device_attribute power_ro_lock;
 121         int     area_type;
 122 };
 123
 124 static DEFINE_MUTEX(open_lock);
 125
 126 enum {
 127         MMC_PACKED_NR_IDX = -1,
 128         MMC_PACKED_NR_ZERO,
 129         MMC_PACKED_NR_SINGLE,
 130 };
 131
 132 module_param(perdev_minors, int, 0444);
 133 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 134
 135 static inline int mmc_blk_part_switch(struct mmc_card *card,
 136                                       struct mmc_blk_data *md);
 137 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 138
 139 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 140 {
 141         struct mmc_packed *packed = mqrq->packed;
 142
 143         BUG_ON(!packed);
 144
 145         mqrq->cmd_type = MMC_PACKED_NONE;
 146         packed->nr_entries = MMC_PACKED_NR_ZERO;
 147         packed->idx_failure = MMC_PACKED_NR_IDX;
 148         packed->retries = 0;
 149         packed->blocks = 0;
 150 }
 151
 152 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 153 {
 154         struct mmc_blk_data *md;
 155
 156         mutex_lock(&open_lock);
 157         md = disk->private_data;
 158         if (md && md->usage == 0)
 159                 md = NULL;
 160         if (md)
 161                 md->usage++;
 162         mutex_unlock(&open_lock);
 163
 164         return md;
 165 }
 166
 167 static inline int mmc_get_devidx(struct gendisk *disk)
 168 {
 169         int devmaj = MAJOR(disk_devt(disk));
 170         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 171
 172         if (!devmaj)
 173                 devidx = disk->first_minor / perdev_minors;
 174         return devidx;
 175 }
 176
 177 static void mmc_blk_put(struct mmc_blk_data *md)
 178 {
 179         mutex_lock(&open_lock);
 180         md->usage--;
 181         if (md->usage == 0) {
 182                 int devidx = mmc_get_devidx(md->disk);
 183                 blk_cleanup_queue(md->queue.queue);
 184
 185                 __clear_bit(devidx, dev_use);
 186
 187                 put_disk(md->disk);
 188                 kfree(md);
 189         }
 190         mutex_unlock(&open_lock);
 191 }
 192
 193 static ssize_t power_ro_lock_show(struct device *dev,
 194                 struct device_attribute *attr, char *buf)
 195 {
 196         int ret;
 197         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 198         struct mmc_card *card = md->queue.card;
 199         int locked = 0;
 200
 201         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 202                 locked = 2;
 203         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 204                 locked = 1;
 205
 206         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 207
 208         return ret;
 209 }
 210
 211 static ssize_t power_ro_lock_store(struct device *dev,
 212                 struct device_attribute *attr, const char *buf, size_t count)
 213 {
 214         int ret;
 215         struct mmc_blk_data *md, *part_md;
 216         struct mmc_card *card;
 217         unsigned long set;
 218
 219         if (kstrtoul(buf, 0, &set))
 220                 return -EINVAL;
 221
 222         if (set != 1)
 223                 return count;
 224
 225         md = mmc_blk_get(dev_to_disk(dev));
 226         card = md->queue.card;
 227
 228         mmc_get_card(card);
 229
 230         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 231                                 card->ext_csd.boot_ro_lock |
 232                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 233                                 card->ext_csd.part_time);
 234         if (ret)
 235                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 236         else
 237                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 238
 239         mmc_put_card(card);
 240
 241         if (!ret) {
 242                 pr_info("%s: Locking boot partition ro until next power on\n",
 243                         md->disk->disk_name);
 244                 set_disk_ro(md->disk, 1);
 245
 246                 list_for_each_entry(part_md, &md->part, part)
 247                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 248                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 249                                 set_disk_ro(part_md->disk, 1);
 250                         }
 251         }
 252
 253         mmc_blk_put(md);
 254         return count;
 255 }
 256
 257 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 258                              char *buf)
 259 {
 260         int ret;
 261         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 262
 263         ret = snprintf(buf, PAGE_SIZE, "%d",
 264                        get_disk_ro(dev_to_disk(dev)) ^
 265                        md->read_only);
 266         mmc_blk_put(md);
 267         return ret;
 268 }
 269
 270 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 271                               const char *buf, size_t count)
 272 {
 273         int ret;
 274         char *end;
 275         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 276         unsigned long set = simple_strtoul(buf, &end, 0);
 277         if (end == buf) {
 278                 ret = -EINVAL;
 279                 goto out;
 280         }
 281
 282         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 283         ret = count;
 284 out:
 285         mmc_blk_put(md);
 286         return ret;
 287 }
 288
 289 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 290 {
 291         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 292         int ret = -ENXIO;
 293
 294         mutex_lock(&block_mutex);
 295         if (md) {
 296                 if (md->usage == 2)
 297                         check_disk_change(bdev);
 298                 ret = 0;
 299
 300                 if ((mode & FMODE_WRITE) && md->read_only) {
 301                         mmc_blk_put(md);
 302                         ret = -EROFS;
 303                 }
 304         }
 305         mutex_unlock(&block_mutex);
 306
 307         return ret;
 308 }
 309
 310 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 311 {
 312         struct mmc_blk_data *md = disk->private_data;
 313
 314         mutex_lock(&block_mutex);
 315         mmc_blk_put(md);
 316         mutex_unlock(&block_mutex);
 317 }
 318
 319 static int
 320 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 321 {
 322         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 323         geo->heads = 4;
 324         geo->sectors = 16;
 325         return 0;
 326 }
 327
 328 struct mmc_blk_ioc_data {
 329         struct mmc_ioc_cmd ic;
 330         unsigned char *buf;
 331         u64 buf_bytes;
 332 };
 333
 334 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 335         struct mmc_ioc_cmd __user *user)
 336 {
 337         struct mmc_blk_ioc_data *idata;
 338         int err;
 339
 340         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 341         if (!idata) {
 342                 err = -ENOMEM;
 343                 goto out;
 344         }
 345
 346         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 347                 err = -EFAULT;
 348                 goto idata_err;
 349         }
 350
 351         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 352         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 353                 err = -EOVERFLOW;
 354                 goto idata_err;
 355         }
 356
 357         if (!idata->buf_bytes)
 358                 return idata;
 359
 360         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 361         if (!idata->buf) {
 362                 err = -ENOMEM;
 363                 goto idata_err;
 364         }
 365
 366         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 367                                         idata->ic.data_ptr, idata->buf_bytes)) {
 368                 err = -EFAULT;
 369                 goto copy_err;
 370         }
 371
 372         return idata;
 373
 374 copy_err:
 375         kfree(idata->buf);
 376 idata_err:
 377         kfree(idata);
 378 out:
 379         return ERR_PTR(err);
 380 }
 381
 382 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 383                                        u32 retries_max)
 384 {
 385         int err;
 386         u32 retry_count = 0;
 387
 388         if (!status || !retries_max)
 389                 return -EINVAL;
 390
 391         do {
 392                 err = get_card_status(card, status, 5);
 393                 if (err)
 394                         break;
 395
 396                 if (!R1_STATUS(*status) &&
 397                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 398                         break; /* RPMB programming operation complete */
 399
 400                 /*
 401                  * Rechedule to give the MMC device a chance to continue
 402                  * processing the previous command without being polled too
 403                  * frequently.
 404                  */
 405                 usleep_range(1000, 5000);
 406         } while (++retry_count < retries_max);
 407
 408         if (retry_count == retries_max)
 409                 err = -EPERM;
 410
 411         return err;
 412 }
 413
 414 static int ioctl_do_sanitize(struct mmc_card *card)
 415 {
 416         int err;
 417
 418         if (!(mmc_can_sanitize(card) &&
 419               (card->host->caps2 & MMC_CAP2_SANITIZE))) {
 420                         pr_warn("%s: %s - SANITIZE is not supported\n",
 421                                 mmc_hostname(card->host), __func__);
 422                         err = -EOPNOTSUPP;
 423                         goto out;
 424         }
 425
 426         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 427                 mmc_hostname(card->host), __func__);
 428
 429         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 430                                         EXT_CSD_SANITIZE_START, 1,
 431                                         MMC_SANITIZE_REQ_TIMEOUT);
 432
 433         if (err)
 434                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 435                        mmc_hostname(card->host), __func__, err);
 436
 437         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 438                                              __func__);
 439 out:
 440         return err;
 441 }
 442
 443 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 444         struct mmc_ioc_cmd __user *ic_ptr)
 445 {
 446         struct mmc_blk_ioc_data *idata;
 447         struct mmc_blk_data *md;
 448         struct mmc_card *card;
 449         struct mmc_command cmd = {0};
 450         struct mmc_data data = {0};
 451         struct mmc_request mrq = {NULL};
 452         struct scatterlist sg;
 453         int err;
 454         int is_rpmb = false;
 455         u32 status = 0;
 456
 457         /*
 458          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 459          * whole block device, not on a partition.  This prevents overspray
 460          * between sibling partitions.
 461          */
 462         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 463                 return -EPERM;
 464
 465         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 466         if (IS_ERR(idata))
 467                 return PTR_ERR(idata);
 468
 469         md = mmc_blk_get(bdev->bd_disk);
 470         if (!md) {
 471                 err = -EINVAL;
 472                 goto cmd_err;
 473         }
 474
 475         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 476                 is_rpmb = true;
 477
 478         card = md->queue.card;
 479         if (IS_ERR(card)) {
 480                 err = PTR_ERR(card);
 481                 goto cmd_done;
 482         }
 483
 484         cmd.opcode = idata->ic.opcode;
 485         cmd.arg = idata->ic.arg;
 486         cmd.flags = idata->ic.flags;
 487
 488         if (idata->buf_bytes) {
 489                 data.sg = &sg;
 490                 data.sg_len = 1;
 491                 data.blksz = idata->ic.blksz;
 492                 data.blocks = idata->ic.blocks;
 493
 494                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 495
 496                 if (idata->ic.write_flag)
 497                         data.flags = MMC_DATA_WRITE;
 498                 else
 499                         data.flags = MMC_DATA_READ;
 500
 501                 /* data.flags must already be set before doing this. */
 502                 mmc_set_data_timeout(&data, card);
 503
 504                 /* Allow overriding the timeout_ns for empirical tuning. */
 505                 if (idata->ic.data_timeout_ns)
 506                         data.timeout_ns = idata->ic.data_timeout_ns;
 507
 508                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 509                         /*
 510                          * Pretend this is a data transfer and rely on the
 511                          * host driver to compute timeout.  When all host
 512                          * drivers support cmd.cmd_timeout for R1B, this
 513                          * can be changed to:
 514                          *
 515                          *     mrq.data = NULL;
 516                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 517                          */
 518                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 519                 }
 520
 521                 mrq.data = &data;
 522         }
 523
 524         mrq.cmd = &cmd;
 525
 526         mmc_get_card(card);
 527
 528         err = mmc_blk_part_switch(card, md);
 529         if (err)
 530                 goto cmd_rel_host;
 531
 532         if (idata->ic.is_acmd) {
 533                 err = mmc_app_cmd(card->host, card);
 534                 if (err)
 535                         goto cmd_rel_host;
 536         }
 537
 538         if (is_rpmb) {
 539                 err = mmc_set_blockcount(card, data.blocks,
 540                         idata->ic.write_flag & (1 << 31));
 541                 if (err)
 542                         goto cmd_rel_host;
 543         }
 544
 545         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 546             (cmd.opcode == MMC_SWITCH)) {
 547                 err = ioctl_do_sanitize(card);
 548
 549                 if (err)
 550                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 551                                __func__, err);
 552
 553                 goto cmd_rel_host;
 554         }
 555
 556         mmc_wait_for_req(card->host, &mrq);
 557
 558         if (cmd.error) {
 559                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 560                                                 __func__, cmd.error);
 561                 err = cmd.error;
 562                 goto cmd_rel_host;
 563         }
 564         if (data.error) {
 565                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 566                                                 __func__, data.error);
 567                 err = data.error;
 568                 goto cmd_rel_host;
 569         }
 570
 571         /*
 572          * According to the SD specs, some commands require a delay after
 573          * issuing the command.
 574          */
 575         if (idata->ic.postsleep_min_us)
 576                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 577
 578         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 579                 err = -EFAULT;
 580                 goto cmd_rel_host;
 581         }
 582
 583         if (!idata->ic.write_flag) {
 584                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 585                                                 idata->buf, idata->buf_bytes)) {
 586                         err = -EFAULT;
 587                         goto cmd_rel_host;
 588                 }
 589         }
 590
 591         if (is_rpmb) {
 592                 /*
 593                  * Ensure RPMB command has completed by polling CMD13
 594                  * "Send Status".
 595                  */
 596                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 597                 if (err)
 598                         dev_err(mmc_dev(card->host),
 599                                         "%s: Card Status=0x%08X, error %d\n",
 600                                         __func__, status, err);
 601         }
 602
 603 cmd_rel_host:
 604         mmc_put_card(card);
 605
 606 cmd_done:
 607         mmc_blk_put(md);
 608 cmd_err:
 609         kfree(idata->buf);
 610         kfree(idata);
 611         return err;
 612 }
 613
 614 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 615         unsigned int cmd, unsigned long arg)
 616 {
 617         int ret = -EINVAL;
 618         if (cmd == MMC_IOC_CMD)
 619                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 620         return ret;
 621 }
 622
 623 #ifdef CONFIG_COMPAT
 624 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 625         unsigned int cmd, unsigned long arg)
 626 {
 627         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 628 }
 629 #endif
 630
 631 static const struct block_device_operations mmc_bdops = {
 632         .open                   = mmc_blk_open,
 633         .release                = mmc_blk_release,
 634         .getgeo                 = mmc_blk_getgeo,
 635         .owner                  = THIS_MODULE,
 636         .ioctl                  = mmc_blk_ioctl,
 637 #ifdef CONFIG_COMPAT
 638         .compat_ioctl           = mmc_blk_compat_ioctl,
 639 #endif
 640 };
 641
 642 static inline int mmc_blk_part_switch(struct mmc_card *card,
 643                                       struct mmc_blk_data *md)
 644 {
 645         int ret;
 646         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
 647
 648         if (main_md->part_curr == md->part_type)
 649                 return 0;
 650
 651         if (mmc_card_mmc(card)) {
 652                 u8 part_config = card->ext_csd.part_config;
 653
 654                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 655                 part_config |= md->part_type;
 656
 657                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 658                                  EXT_CSD_PART_CONFIG, part_config,
 659                                  card->ext_csd.part_time);
 660                 if (ret)
 661                         return ret;
 662
 663                 card->ext_csd.part_config = part_config;
 664         }
 665
 666         main_md->part_curr = md->part_type;
 667         return 0;
 668 }
 669
 670 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 671 {
 672         int err;
 673         u32 result;
 674         __be32 *blocks;
 675
 676         struct mmc_request mrq = {NULL};
 677         struct mmc_command cmd = {0};
 678         struct mmc_data data = {0};
 679
 680         struct scatterlist sg;
 681
 682         cmd.opcode = MMC_APP_CMD;
 683         cmd.arg = card->rca << 16;
 684         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 685
 686         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 687         if (err)
 688                 return (u32)-1;
 689         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 690                 return (u32)-1;
 691
 692         memset(&cmd, 0, sizeof(struct mmc_command));
 693
 694         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 695         cmd.arg = 0;
 696         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 697
 698         data.blksz = 4;
 699         data.blocks = 1;
 700         data.flags = MMC_DATA_READ;
 701         data.sg = &sg;
 702         data.sg_len = 1;
 703         mmc_set_data_timeout(&data, card);
 704
 705         mrq.cmd = &cmd;
 706         mrq.data = &data;
 707
 708         blocks = kmalloc(4, GFP_KERNEL);
 709         if (!blocks)
 710                 return (u32)-1;
 711
 712         sg_init_one(&sg, blocks, 4);
 713
 714         mmc_wait_for_req(card->host, &mrq);
 715
 716         result = ntohl(*blocks);
 717         kfree(blocks);
 718
 719         if (cmd.error || data.error)
 720                 result = (u32)-1;
 721
 722         return result;
 723 }
 724
 725 static int send_stop(struct mmc_card *card, u32 *status)
 726 {
 727         struct mmc_command cmd = {0};
 728         int err;
 729
 730         cmd.opcode = MMC_STOP_TRANSMISSION;
 731         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 732         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 733         if (err == 0)
 734                 *status = cmd.resp[0];
 735         return err;
 736 }
 737
 738 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 739 {
 740         struct mmc_command cmd = {0};
 741         int err;
 742
 743         cmd.opcode = MMC_SEND_STATUS;
 744         if (!mmc_host_is_spi(card->host))
 745                 cmd.arg = card->rca << 16;
 746         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 747         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 748         if (err == 0)
 749                 *status = cmd.resp[0];
 750         return err;
 751 }
 752
 753 #define ERR_NOMEDIUM    3
 754 #define ERR_RETRY       2
 755 #define ERR_ABORT       1
 756 #define ERR_CONTINUE    0
 757
 758 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 759         bool status_valid, u32 status)
 760 {
 761         switch (error) {
 762         case -EILSEQ:
 763                 /* response crc error, retry the r/w cmd */
 764                 pr_err("%s: %s sending %s command, card status %#x\n",
 765                         req->rq_disk->disk_name, "response CRC error",
 766                         name, status);
 767                 return ERR_RETRY;
 768
 769         case -ETIMEDOUT:
 770                 pr_err("%s: %s sending %s command, card status %#x\n",
 771                         req->rq_disk->disk_name, "timed out", name, status);
 772
 773                 /* If the status cmd initially failed, retry the r/w cmd */
 774                 if (!status_valid)
 775                         return ERR_RETRY;
 776
 777                 /*
 778                  * If it was a r/w cmd crc error, or illegal command
 779                  * (eg, issued in wrong state) then retry - we should
 780                  * have corrected the state problem above.
 781                  */
 782                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 783                         return ERR_RETRY;
 784
 785                 /* Otherwise abort the command */
 786                 return ERR_ABORT;
 787
 788         default:
 789                 /* We don't understand the error code the driver gave us */
 790                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 791                        req->rq_disk->disk_name, error, status);
 792                 return ERR_ABORT;
 793         }
 794 }
 795
 796 /*
 797  * Initial r/w and stop cmd error recovery.
 798  * We don't know whether the card received the r/w cmd or not, so try to
 799  * restore things back to a sane state.  Essentially, we do this as follows:
 800  * - Obtain card status.  If the first attempt to obtain card status fails,
 801  *   the status word will reflect the failed status cmd, not the failed
 802  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 803  *   longer communicate with the card.
 804  * - Check the card state.  If the card received the cmd but there was a
 805  *   transient problem with the response, it might still be in a data transfer
 806  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 807  * - If the r/w cmd failed due to a response CRC error, it was probably
 808  *   transient, so retry the cmd.
 809  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 810  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 811  *   illegal cmd, retry.
 812  * Otherwise we don't understand what happened, so abort.
 813  */
 814 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 815         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 816 {
 817         bool prev_cmd_status_valid = true;
 818         u32 status, stop_status = 0;
 819         int err, retry;
 820
 821         if (mmc_card_removed(card))
 822                 return ERR_NOMEDIUM;
 823
 824         /*
 825          * Try to get card status which indicates both the card state
 826          * and why there was no response.  If the first attempt fails,
 827          * we can't be sure the returned status is for the r/w command.
 828          */
 829         for (retry = 2; retry >= 0; retry--) {
 830                 err = get_card_status(card, &status, 0);
 831                 if (!err)
 832                         break;
 833
 834                 prev_cmd_status_valid = false;
 835                 pr_err("%s: error %d sending status command, %sing\n",
 836                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 837         }
 838
 839         /* We couldn't get a response from the card.  Give up. */
 840         if (err) {
 841                 /* Check if the card is removed */
 842                 if (mmc_detect_card_removed(card->host))
 843                         return ERR_NOMEDIUM;
 844                 return ERR_ABORT;
 845         }
 846
 847         /* Flag ECC errors */
 848         if ((status & R1_CARD_ECC_FAILED) ||
 849             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 850             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 851                 *ecc_err = 1;
 852
 853         /* Flag General errors */
 854         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 855                 if ((status & R1_ERROR) ||
 856                         (brq->stop.resp[0] & R1_ERROR)) {
 857                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 858                                req->rq_disk->disk_name, __func__,
 859                                brq->stop.resp[0], status);
 860                         *gen_err = 1;
 861                 }
 862
 863         /*
 864          * Check the current card state.  If it is in some data transfer
 865          * mode, tell it to stop (and hopefully transition back to TRAN.)
 866          */
 867         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 868             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 869                 err = send_stop(card, &stop_status);
 870                 if (err)
 871                         pr_err("%s: error %d sending stop command\n",
 872                                req->rq_disk->disk_name, err);
 873
 874                 /*
 875                  * If the stop cmd also timed out, the card is probably
 876                  * not present, so abort.  Other errors are bad news too.
 877                  */
 878                 if (err)
 879                         return ERR_ABORT;
 880                 if (stop_status & R1_CARD_ECC_FAILED)
 881                         *ecc_err = 1;
 882                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 883                         if (stop_status & R1_ERROR) {
 884                                 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
 885                                        req->rq_disk->disk_name, __func__,
 886                                        stop_status);
 887                                 *gen_err = 1;
 888                         }
 889         }
 890
 891         /* Check for set block count errors */
 892         if (brq->sbc.error)
 893                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 894                                 prev_cmd_status_valid, status);
 895
 896         /* Check for r/w command errors */
 897         if (brq->cmd.error)
 898                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 899                                 prev_cmd_status_valid, status);
 900
 901         /* Data errors */
 902         if (!brq->stop.error)
 903                 return ERR_CONTINUE;
 904
 905         /* Now for stop errors.  These aren't fatal to the transfer. */
 906         pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 907                req->rq_disk->disk_name, brq->stop.error,
 908                brq->cmd.resp[0], status);
 909
 910         /*
 911          * Subsitute in our own stop status as this will give the error
 912          * state which happened during the execution of the r/w command.
 913          */
 914         if (stop_status) {
 915                 brq->stop.resp[0] = stop_status;
 916                 brq->stop.error = 0;
 917         }
 918         return ERR_CONTINUE;
 919 }
 920
 921 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 922                          int type)
 923 {
 924         int err;
 925
 926         if (md->reset_done & type)
 927                 return -EEXIST;
 928
 929         md->reset_done |= type;
 930         err = mmc_hw_reset(host);
 931         /* Ensure we switch back to the correct partition */
 932         if (err != -EOPNOTSUPP) {
 933                 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
 934                 int part_err;
 935
 936                 main_md->part_curr = main_md->part_type;
 937                 part_err = mmc_blk_part_switch(host->card, md);
 938                 if (part_err) {
 939                         /*
 940                          * We have failed to get back into the correct
 941                          * partition, so we need to abort the whole request.
 942                          */
 943                         return -ENODEV;
 944                 }
 945         }
 946         return err;
 947 }
 948
 949 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
 950 {
 951         md->reset_done &= ~type;
 952 }
 953
 954 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 955 {
 956         struct mmc_blk_data *md = mq->data;
 957         struct mmc_card *card = md->queue.card;
 958         unsigned int from, nr, arg;
 959         int err = 0, type = MMC_BLK_DISCARD;
 960
 961         if (!mmc_can_erase(card)) {
 962                 err = -EOPNOTSUPP;
 963                 goto out;
 964         }
 965
 966         from = blk_rq_pos(req);
 967         nr = blk_rq_sectors(req);
 968
 969         if (mmc_can_discard(card))
 970                 arg = MMC_DISCARD_ARG;
 971         else if (mmc_can_trim(card))
 972                 arg = MMC_TRIM_ARG;
 973         else
 974                 arg = MMC_ERASE_ARG;
 975 retry:
 976         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 977                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 978                                  INAND_CMD38_ARG_EXT_CSD,
 979                                  arg == MMC_TRIM_ARG ?
 980                                  INAND_CMD38_ARG_TRIM :
 981                                  INAND_CMD38_ARG_ERASE,
 982                                  0);
 983                 if (err)
 984                         goto out;
 985         }
 986         err = mmc_erase(card, from, nr, arg);
 987 out:
 988         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
 989                 goto retry;
 990         if (!err)
 991                 mmc_blk_reset_success(md, type);
 992         blk_end_request(req, err, blk_rq_bytes(req));
 993
 994         return err ? 0 : 1;
 995 }
 996
 997 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 998                                        struct request *req)
 999 {
1000         struct mmc_blk_data *md = mq->data;
1001         struct mmc_card *card = md->queue.card;
1002         unsigned int from, nr, arg;
1003         int err = 0, type = MMC_BLK_SECDISCARD;
1004
1005         if (!(mmc_can_secure_erase_trim(card))) {
1006                 err = -EOPNOTSUPP;
1007                 goto out;
1008         }
1009
1010         from = blk_rq_pos(req);
1011         nr = blk_rq_sectors(req);
1012
1013         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1014                 arg = MMC_SECURE_TRIM1_ARG;
1015         else
1016                 arg = MMC_SECURE_ERASE_ARG;
1017
1018 retry:
1019         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1020                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1021                                  INAND_CMD38_ARG_EXT_CSD,
1022                                  arg == MMC_SECURE_TRIM1_ARG ?
1023                                  INAND_CMD38_ARG_SECTRIM1 :
1024                                  INAND_CMD38_ARG_SECERASE,
1025                                  0);
1026                 if (err)
1027                         goto out_retry;
1028         }
1029
1030         err = mmc_erase(card, from, nr, arg);
1031         if (err == -EIO)
1032                 goto out_retry;
1033         if (err)
1034                 goto out;
1035
1036         if (arg == MMC_SECURE_TRIM1_ARG) {
1037                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1038                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1039                                          INAND_CMD38_ARG_EXT_CSD,
1040                                          INAND_CMD38_ARG_SECTRIM2,
1041                                          0);
1042                         if (err)
1043                                 goto out_retry;
1044                 }
1045
1046                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1047                 if (err == -EIO)
1048                         goto out_retry;
1049                 if (err)
1050                         goto out;
1051         }
1052
1053 out_retry:
1054         if (err && !mmc_blk_reset(md, card->host, type))
1055                 goto retry;
1056         if (!err)
1057                 mmc_blk_reset_success(md, type);
1058 out:
1059         blk_end_request(req, err, blk_rq_bytes(req));
1060
1061         return err ? 0 : 1;
1062 }
1063
1064 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1065 {
1066         struct mmc_blk_data *md = mq->data;
1067         struct mmc_card *card = md->queue.card;
1068         int ret = 0;
1069
1070         ret = mmc_flush_cache(card);
1071         if (ret)
1072                 ret = -EIO;
1073
1074         blk_end_request_all(req, ret);
1075
1076         return ret ? 0 : 1;
1077 }
1078
1079 /*
1080  * Reformat current write as a reliable write, supporting
1081  * both legacy and the enhanced reliable write MMC cards.
1082  * In each transfer we'll handle only as much as a single
1083  * reliable write can handle, thus finish the request in
1084  * partial completions.
1085  */
1086 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1087                                     struct mmc_card *card,
1088                                     struct request *req)
1089 {
1090         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1091                 /* Legacy mode imposes restrictions on transfers. */
1092                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1093                         brq->data.blocks = 1;
1094
1095                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1096                         brq->data.blocks = card->ext_csd.rel_sectors;
1097                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1098                         brq->data.blocks = 1;
1099         }
1100 }
1101
1102 #define CMD_ERRORS                                                      \
1103         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1104          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1105          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1106          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1107          R1_CC_ERROR |          /* Card controller error */             \
1108          R1_ERROR)              /* General/unknown error */
1109
1110 static int mmc_blk_err_check(struct mmc_card *card,
1111                              struct mmc_async_req *areq)
1112 {
1113         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1114                                                     mmc_active);
1115         struct mmc_blk_request *brq = &mq_mrq->brq;
1116         struct request *req = mq_mrq->req;
1117         int ecc_err = 0, gen_err = 0;
1118
1119         /*
1120          * sbc.error indicates a problem with the set block count
1121          * command.  No data will have been transferred.
1122          *
1123          * cmd.error indicates a problem with the r/w command.  No
1124          * data will have been transferred.
1125          *
1126          * stop.error indicates a problem with the stop command.  Data
1127          * may have been transferred, or may still be transferring.
1128          */
1129         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1130             brq->data.error) {
1131                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1132                 case ERR_RETRY:
1133                         return MMC_BLK_RETRY;
1134                 case ERR_ABORT:
1135                         return MMC_BLK_ABORT;
1136                 case ERR_NOMEDIUM:
1137                         return MMC_BLK_NOMEDIUM;
1138                 case ERR_CONTINUE:
1139                         break;
1140                 }
1141         }
1142
1143         /*
1144          * Check for errors relating to the execution of the
1145          * initial command - such as address errors.  No data
1146          * has been transferred.
1147          */
1148         if (brq->cmd.resp[0] & CMD_ERRORS) {
1149                 pr_err("%s: r/w command failed, status = %#x\n",
1150                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1151                 return MMC_BLK_ABORT;
1152         }
1153
1154         /*
1155          * Everything else is either success, or a data error of some
1156          * kind.  If it was a write, we may have transitioned to
1157          * program mode, which we have to wait for it to complete.
1158          */
1159         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1160                 u32 status;
1161                 unsigned long timeout;
1162
1163                 /* Check stop command response */
1164                 if (brq->stop.resp[0] & R1_ERROR) {
1165                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1166                                req->rq_disk->disk_name, __func__,
1167                                brq->stop.resp[0]);
1168                         gen_err = 1;
1169                 }
1170
1171                 timeout = jiffies + msecs_to_jiffies(MMC_BLK_TIMEOUT_MS);
1172                 do {
1173                         int err = get_card_status(card, &status, 5);
1174                         if (err) {
1175                                 pr_err("%s: error %d requesting status\n",
1176                                        req->rq_disk->disk_name, err);
1177                                 return MMC_BLK_CMD_ERR;
1178                         }
1179
1180                         if (status & R1_ERROR) {
1181                                 pr_err("%s: %s: general error sending status command, card status %#x\n",
1182                                        req->rq_disk->disk_name, __func__,
1183                                        status);
1184                                 gen_err = 1;
1185                         }
1186
1187                         /* Timeout if the device never becomes ready for data
1188                          * and never leaves the program state.
1189                          */
1190                         if (time_after(jiffies, timeout)) {
1191                                 pr_err("%s: Card stuck in programming state!"\
1192                                         " %s %s\n", mmc_hostname(card->host),
1193                                         req->rq_disk->disk_name, __func__);
1194
1195                                 return MMC_BLK_CMD_ERR;
1196                         }
1197                         /*
1198                          * Some cards mishandle the status bits,
1199                          * so make sure to check both the busy
1200                          * indication and the card state.
1201                          */
1202                 } while (!(status & R1_READY_FOR_DATA) ||
1203                          (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1204         }
1205
1206         /* if general error occurs, retry the write operation. */
1207         if (gen_err) {
1208                 pr_warn("%s: retrying write for general error\n",
1209                                 req->rq_disk->disk_name);
1210                 return MMC_BLK_RETRY;
1211         }
1212
1213         if (brq->data.error) {
1214                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1215                        req->rq_disk->disk_name, brq->data.error,
1216                        (unsigned)blk_rq_pos(req),
1217                        (unsigned)blk_rq_sectors(req),
1218                        brq->cmd.resp[0], brq->stop.resp[0]);
1219
1220                 if (rq_data_dir(req) == READ) {
1221                         if (ecc_err)
1222                                 return MMC_BLK_ECC_ERR;
1223                         return MMC_BLK_DATA_ERR;
1224                 } else {
1225                         return MMC_BLK_CMD_ERR;
1226                 }
1227         }
1228
1229         if (!brq->data.bytes_xfered)
1230                 return MMC_BLK_RETRY;
1231
1232         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1233                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1234                         return MMC_BLK_PARTIAL;
1235                 else
1236                         return MMC_BLK_SUCCESS;
1237         }
1238
1239         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1240                 return MMC_BLK_PARTIAL;
1241
1242         return MMC_BLK_SUCCESS;
1243 }
1244
1245 static int mmc_blk_packed_err_check(struct mmc_card *card,
1246                                     struct mmc_async_req *areq)
1247 {
1248         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1249                         mmc_active);
1250         struct request *req = mq_rq->req;
1251         struct mmc_packed *packed = mq_rq->packed;
1252         int err, check, status;
1253         u8 *ext_csd;
1254
1255         BUG_ON(!packed);
1256
1257         packed->retries--;
1258         check = mmc_blk_err_check(card, areq);
1259         err = get_card_status(card, &status, 0);
1260         if (err) {
1261                 pr_err("%s: error %d sending status command\n",
1262                        req->rq_disk->disk_name, err);
1263                 return MMC_BLK_ABORT;
1264         }
1265
1266         if (status & R1_EXCEPTION_EVENT) {
1267                 ext_csd = kzalloc(512, GFP_KERNEL);
1268                 if (!ext_csd) {
1269                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1270                                req->rq_disk->disk_name);
1271                         return -ENOMEM;
1272                 }
1273
1274                 err = mmc_send_ext_csd(card, ext_csd);
1275                 if (err) {
1276                         pr_err("%s: error %d sending ext_csd\n",
1277                                req->rq_disk->disk_name, err);
1278                         check = MMC_BLK_ABORT;
1279                         goto free;
1280                 }
1281
1282                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1283                      EXT_CSD_PACKED_FAILURE) &&
1284                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1285                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1286                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1287                             EXT_CSD_PACKED_INDEXED_ERROR) {
1288                                 packed->idx_failure =
1289                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1290                                 check = MMC_BLK_PARTIAL;
1291                         }
1292                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1293                                "failure index: %d\n",
1294                                req->rq_disk->disk_name, packed->nr_entries,
1295                                packed->blocks, packed->idx_failure);
1296                 }
1297 free:
1298                 kfree(ext_csd);
1299         }
1300
1301         return check;
1302 }
1303
1304 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1305                                struct mmc_card *card,
1306                                int disable_multi,
1307                                struct mmc_queue *mq)
1308 {
1309         u32 readcmd, writecmd;
1310         struct mmc_blk_request *brq = &mqrq->brq;
1311         struct request *req = mqrq->req;
1312         struct mmc_blk_data *md = mq->data;
1313         bool do_data_tag;
1314
1315         /*
1316          * Reliable writes are used to implement Forced Unit Access and
1317          * REQ_META accesses, and are supported only on MMCs.
1318          *
1319          * XXX: this really needs a good explanation of why REQ_META
1320          * is treated special.
1321          */
1322         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1323                           (req->cmd_flags & REQ_META)) &&
1324                 (rq_data_dir(req) == WRITE) &&
1325                 (md->flags & MMC_BLK_REL_WR);
1326
1327         memset(brq, 0, sizeof(struct mmc_blk_request));
1328         brq->mrq.cmd = &brq->cmd;
1329         brq->mrq.data = &brq->data;
1330
1331         brq->cmd.arg = blk_rq_pos(req);
1332         if (!mmc_card_blockaddr(card))
1333                 brq->cmd.arg <<= 9;
1334         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1335         brq->data.blksz = 512;
1336         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1337         brq->stop.arg = 0;
1338         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1339         brq->data.blocks = blk_rq_sectors(req);
1340
1341         /*
1342          * The block layer doesn't support all sector count
1343          * restrictions, so we need to be prepared for too big
1344          * requests.
1345          */
1346         if (brq->data.blocks > card->host->max_blk_count)
1347                 brq->data.blocks = card->host->max_blk_count;
1348
1349         if (brq->data.blocks > 1) {
1350                 /*
1351                  * After a read error, we redo the request one sector
1352                  * at a time in order to accurately determine which
1353                  * sectors can be read successfully.
1354                  */
1355                 if (disable_multi)
1356                         brq->data.blocks = 1;
1357
1358                 /* Some controllers can't do multiblock reads due to hw bugs */
1359                 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1360                     rq_data_dir(req) == READ)
1361                         brq->data.blocks = 1;
1362
1363                 /*
1364                  * Some controllers have HW issues while operating
1365                  * in multiple I/O mode
1366                  */
1367                 if (card->host->ops->multi_io_quirk)
1368                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1369                                                 (rq_data_dir(req) == READ) ?
1370                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1371                                                 brq->data.blocks);
1372         }
1373
1374         if (brq->data.blocks > 1 || do_rel_wr) {
1375                 /* SPI multiblock writes terminate using a special
1376                  * token, not a STOP_TRANSMISSION request.
1377                  */
1378                 if (!mmc_host_is_spi(card->host) ||
1379                     rq_data_dir(req) == READ)
1380                         brq->mrq.stop = &brq->stop;
1381                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1382                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1383         } else {
1384                 brq->mrq.stop = NULL;
1385                 readcmd = MMC_READ_SINGLE_BLOCK;
1386                 writecmd = MMC_WRITE_BLOCK;
1387         }
1388         if (rq_data_dir(req) == READ) {
1389                 brq->cmd.opcode = readcmd;
1390                 brq->data.flags |= MMC_DATA_READ;
1391         } else {
1392                 brq->cmd.opcode = writecmd;
1393                 brq->data.flags |= MMC_DATA_WRITE;
1394         }
1395
1396         if (do_rel_wr)
1397                 mmc_apply_rel_rw(brq, card, req);
1398
1399         /*
1400          * Data tag is used only during writing meta data to speed
1401          * up write and any subsequent read of this meta data
1402          */
1403         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1404                 (req->cmd_flags & REQ_META) &&
1405                 (rq_data_dir(req) == WRITE) &&
1406                 ((brq->data.blocks * brq->data.blksz) >=
1407                  card->ext_csd.data_tag_unit_size);
1408
1409         /*
1410          * Pre-defined multi-block transfers are preferable to
1411          * open ended-ones (and necessary for reliable writes).
1412          * However, it is not sufficient to just send CMD23,
1413          * and avoid the final CMD12, as on an error condition
1414          * CMD12 (stop) needs to be sent anyway. This, coupled
1415          * with Auto-CMD23 enhancements provided by some
1416          * hosts, means that the complexity of dealing
1417          * with this is best left to the host. If CMD23 is
1418          * supported by card and host, we'll fill sbc in and let
1419          * the host deal with handling it correctly. This means
1420          * that for hosts that don't expose MMC_CAP_CMD23, no
1421          * change of behavior will be observed.
1422          *
1423          * N.B: Some MMC cards experience perf degradation.
1424          * We'll avoid using CMD23-bounded multiblock writes for
1425          * these, while retaining features like reliable writes.
1426          */
1427         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1428             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1429              do_data_tag)) {
1430                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1431                 brq->sbc.arg = brq->data.blocks |
1432                         (do_rel_wr ? (1 << 31) : 0) |
1433                         (do_data_tag ? (1 << 29) : 0);
1434                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1435                 brq->mrq.sbc = &brq->sbc;
1436         }
1437
1438         mmc_set_data_timeout(&brq->data, card);
1439
1440         brq->data.sg = mqrq->sg;
1441         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1442
1443         /*
1444          * Adjust the sg list so it is the same size as the
1445          * request.
1446          */
1447         if (brq->data.blocks != blk_rq_sectors(req)) {
1448                 int i, data_size = brq->data.blocks << 9;
1449                 struct scatterlist *sg;
1450
1451                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1452                         data_size -= sg->length;
1453                         if (data_size <= 0) {
1454                                 sg->length += data_size;
1455                                 i++;
1456                                 break;
1457                         }
1458                 }
1459                 brq->data.sg_len = i;
1460         }
1461
1462         mqrq->mmc_active.mrq = &brq->mrq;
1463         mqrq->mmc_active.err_check = mmc_blk_err_check;
1464
1465         mmc_queue_bounce_pre(mqrq);
1466 }
1467
1468 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1469                                           struct mmc_card *card)
1470 {
1471         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1472         unsigned int max_seg_sz = queue_max_segment_size(q);
1473         unsigned int len, nr_segs = 0;
1474
1475         do {
1476                 len = min(hdr_sz, max_seg_sz);
1477                 hdr_sz -= len;
1478                 nr_segs++;
1479         } while (hdr_sz);
1480
1481         return nr_segs;
1482 }
1483
1484 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1485 {
1486         struct request_queue *q = mq->queue;
1487         struct mmc_card *card = mq->card;
1488         struct request *cur = req, *next = NULL;
1489         struct mmc_blk_data *md = mq->data;
1490         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1491         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1492         unsigned int req_sectors = 0, phys_segments = 0;
1493         unsigned int max_blk_count, max_phys_segs;
1494         bool put_back = true;
1495         u8 max_packed_rw = 0;
1496         u8 reqs = 0;
1497
1498         if (!(md->flags & MMC_BLK_PACKED_CMD))
1499                 goto no_packed;
1500
1501         if ((rq_data_dir(cur) == WRITE) &&
1502             mmc_host_packed_wr(card->host))
1503                 max_packed_rw = card->ext_csd.max_packed_writes;
1504
1505         if (max_packed_rw == 0)
1506                 goto no_packed;
1507
1508         if (mmc_req_rel_wr(cur) &&
1509             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1510                 goto no_packed;
1511
1512         if (mmc_large_sector(card) &&
1513             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1514                 goto no_packed;
1515
1516         mmc_blk_clear_packed(mqrq);
1517
1518         max_blk_count = min(card->host->max_blk_count,
1519                             card->host->max_req_size >> 9);
1520         if (unlikely(max_blk_count > 0xffff))
1521                 max_blk_count = 0xffff;
1522
1523         max_phys_segs = queue_max_segments(q);
1524         req_sectors += blk_rq_sectors(cur);
1525         phys_segments += cur->nr_phys_segments;
1526
1527         if (rq_data_dir(cur) == WRITE) {
1528                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1529                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1530         }
1531
1532         do {
1533                 if (reqs >= max_packed_rw - 1) {
1534                         put_back = false;
1535                         break;
1536                 }
1537
1538                 spin_lock_irq(q->queue_lock);
1539                 next = blk_fetch_request(q);
1540                 spin_unlock_irq(q->queue_lock);
1541                 if (!next) {
1542                         put_back = false;
1543                         break;
1544                 }
1545
1546                 if (mmc_large_sector(card) &&
1547                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1548                         break;
1549
1550                 if (next->cmd_flags & REQ_DISCARD ||
1551                     next->cmd_flags & REQ_FLUSH)
1552                         break;
1553
1554                 if (rq_data_dir(cur) != rq_data_dir(next))
1555                         break;
1556
1557                 if (mmc_req_rel_wr(next) &&
1558                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1559                         break;
1560
1561                 req_sectors += blk_rq_sectors(next);
1562                 if (req_sectors > max_blk_count)
1563                         break;
1564
1565                 phys_segments +=  next->nr_phys_segments;
1566                 if (phys_segments > max_phys_segs)
1567                         break;
1568
1569                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1570                 cur = next;
1571                 reqs++;
1572         } while (1);
1573
1574         if (put_back) {
1575                 spin_lock_irq(q->queue_lock);
1576                 blk_requeue_request(q, next);
1577                 spin_unlock_irq(q->queue_lock);
1578         }
1579
1580         if (reqs > 0) {
1581                 list_add(&req->queuelist, &mqrq->packed->list);
1582                 mqrq->packed->nr_entries = ++reqs;
1583                 mqrq->packed->retries = reqs;
1584                 return reqs;
1585         }
1586
1587 no_packed:
1588         mqrq->cmd_type = MMC_PACKED_NONE;
1589         return 0;
1590 }
1591
1592 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1593                                         struct mmc_card *card,
1594                                         struct mmc_queue *mq)
1595 {
1596         struct mmc_blk_request *brq = &mqrq->brq;
1597         struct request *req = mqrq->req;
1598         struct request *prq;
1599         struct mmc_blk_data *md = mq->data;
1600         struct mmc_packed *packed = mqrq->packed;
1601         bool do_rel_wr, do_data_tag;
1602         u32 *packed_cmd_hdr;
1603         u8 hdr_blocks;
1604         u8 i = 1;
1605
1606         BUG_ON(!packed);
1607
1608         mqrq->cmd_type = MMC_PACKED_WRITE;
1609         packed->blocks = 0;
1610         packed->idx_failure = MMC_PACKED_NR_IDX;
1611
1612         packed_cmd_hdr = packed->cmd_hdr;
1613         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1614         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1615                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1616         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1617
1618         /*
1619          * Argument for each entry of packed group
1620          */
1621         list_for_each_entry(prq, &packed->list, queuelist) {
1622                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1623                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1624                         (prq->cmd_flags & REQ_META) &&
1625                         (rq_data_dir(prq) == WRITE) &&
1626                         ((brq->data.blocks * brq->data.blksz) >=
1627                          card->ext_csd.data_tag_unit_size);
1628                 /* Argument of CMD23 */
1629                 packed_cmd_hdr[(i * 2)] =
1630                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1631                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1632                         blk_rq_sectors(prq);
1633                 /* Argument of CMD18 or CMD25 */
1634                 packed_cmd_hdr[((i * 2)) + 1] =
1635                         mmc_card_blockaddr(card) ?
1636                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1637                 packed->blocks += blk_rq_sectors(prq);
1638                 i++;
1639         }
1640
1641         memset(brq, 0, sizeof(struct mmc_blk_request));
1642         brq->mrq.cmd = &brq->cmd;
1643         brq->mrq.data = &brq->data;
1644         brq->mrq.sbc = &brq->sbc;
1645         brq->mrq.stop = &brq->stop;
1646
1647         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1648         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1649         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1650
1651         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1652         brq->cmd.arg = blk_rq_pos(req);
1653         if (!mmc_card_blockaddr(card))
1654                 brq->cmd.arg <<= 9;
1655         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1656
1657         brq->data.blksz = 512;
1658         brq->data.blocks = packed->blocks + hdr_blocks;
1659         brq->data.flags |= MMC_DATA_WRITE;
1660
1661         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1662         brq->stop.arg = 0;
1663         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1664
1665         mmc_set_data_timeout(&brq->data, card);
1666
1667         brq->data.sg = mqrq->sg;
1668         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1669
1670         mqrq->mmc_active.mrq = &brq->mrq;
1671         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1672
1673         mmc_queue_bounce_pre(mqrq);
1674 }
1675
1676 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1677                            struct mmc_blk_request *brq, struct request *req,
1678                            int ret)
1679 {
1680         struct mmc_queue_req *mq_rq;
1681         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1682
1683         /*
1684          * If this is an SD card and we're writing, we can first
1685          * mark the known good sectors as ok.
1686          *
1687          * If the card is not SD, we can still ok written sectors
1688          * as reported by the controller (which might be less than
1689          * the real number of written sectors, but never more).
1690          */
1691         if (mmc_card_sd(card)) {
1692                 u32 blocks;
1693
1694                 blocks = mmc_sd_num_wr_blocks(card);
1695                 if (blocks != (u32)-1) {
1696                         ret = blk_end_request(req, 0, blocks << 9);
1697                 }
1698         } else {
1699                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1700                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1701         }
1702         return ret;
1703 }
1704
1705 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1706 {
1707         struct request *prq;
1708         struct mmc_packed *packed = mq_rq->packed;
1709         int idx = packed->idx_failure, i = 0;
1710         int ret = 0;
1711
1712         BUG_ON(!packed);
1713
1714         while (!list_empty(&packed->list)) {
1715                 prq = list_entry_rq(packed->list.next);
1716                 if (idx == i) {
1717                         /* retry from error index */
1718                         packed->nr_entries -= idx;
1719                         mq_rq->req = prq;
1720                         ret = 1;
1721
1722                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1723                                 list_del_init(&prq->queuelist);
1724                                 mmc_blk_clear_packed(mq_rq);
1725                         }
1726                         return ret;
1727                 }
1728                 list_del_init(&prq->queuelist);
1729                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1730                 i++;
1731         }
1732
1733         mmc_blk_clear_packed(mq_rq);
1734         return ret;
1735 }
1736
1737 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1738 {
1739         struct request *prq;
1740         struct mmc_packed *packed = mq_rq->packed;
1741
1742         BUG_ON(!packed);
1743
1744         while (!list_empty(&packed->list)) {
1745                 prq = list_entry_rq(packed->list.next);
1746                 list_del_init(&prq->queuelist);
1747                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1748         }
1749
1750         mmc_blk_clear_packed(mq_rq);
1751 }
1752
1753 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1754                                       struct mmc_queue_req *mq_rq)
1755 {
1756         struct request *prq;
1757         struct request_queue *q = mq->queue;
1758         struct mmc_packed *packed = mq_rq->packed;
1759
1760         BUG_ON(!packed);
1761
1762         while (!list_empty(&packed->list)) {
1763                 prq = list_entry_rq(packed->list.prev);
1764                 if (prq->queuelist.prev != &packed->list) {
1765                         list_del_init(&prq->queuelist);
1766                         spin_lock_irq(q->queue_lock);
1767                         blk_requeue_request(mq->queue, prq);
1768                         spin_unlock_irq(q->queue_lock);
1769                 } else {
1770                         list_del_init(&prq->queuelist);
1771                 }
1772         }
1773
1774         mmc_blk_clear_packed(mq_rq);
1775 }
1776
1777 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1778 {
1779         struct mmc_blk_data *md = mq->data;
1780         struct mmc_card *card = md->queue.card;
1781         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1782         int ret = 1, disable_multi = 0, retry = 0, type;
1783         enum mmc_blk_status status;
1784         struct mmc_queue_req *mq_rq;
1785         struct request *req = rqc;
1786         struct mmc_async_req *areq;
1787         const u8 packed_nr = 2;
1788         u8 reqs = 0;
1789
1790         if (!rqc && !mq->mqrq_prev->req)
1791                 return 0;
1792
1793         if (rqc)
1794                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1795
1796         do {
1797                 if (rqc) {
1798                         /*
1799                          * When 4KB native sector is enabled, only 8 blocks
1800                          * multiple read or write is allowed
1801                          */
1802                         if ((brq->data.blocks & 0x07) &&
1803                             (card->ext_csd.data_sector_size == 4096)) {
1804                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1805                                         req->rq_disk->disk_name);
1806                                 mq_rq = mq->mqrq_cur;
1807                                 goto cmd_abort;
1808                         }
1809
1810                         if (reqs >= packed_nr)
1811                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1812                                                             card, mq);
1813                         else
1814                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1815                         areq = &mq->mqrq_cur->mmc_active;
1816                 } else
1817                         areq = NULL;
1818                 areq = mmc_start_req(card->host, areq, (int *) &status);
1819                 if (!areq) {
1820                         if (status == MMC_BLK_NEW_REQUEST)
1821                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1822                         return 0;
1823                 }
1824
1825                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1826                 brq = &mq_rq->brq;
1827                 req = mq_rq->req;
1828                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1829                 mmc_queue_bounce_post(mq_rq);
1830
1831                 switch (status) {
1832                 case MMC_BLK_SUCCESS:
1833                 case MMC_BLK_PARTIAL:
1834                         /*
1835                          * A block was successfully transferred.
1836                          */
1837                         mmc_blk_reset_success(md, type);
1838
1839                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1840                                 ret = mmc_blk_end_packed_req(mq_rq);
1841                                 break;
1842                         } else {
1843                                 ret = blk_end_request(req, 0,
1844                                                 brq->data.bytes_xfered);
1845                         }
1846
1847                         /*
1848                          * If the blk_end_request function returns non-zero even
1849                          * though all data has been transferred and no errors
1850                          * were returned by the host controller, it's a bug.
1851                          */
1852                         if (status == MMC_BLK_SUCCESS && ret) {
1853                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1854                                        __func__, blk_rq_bytes(req),
1855                                        brq->data.bytes_xfered);
1856                                 rqc = NULL;
1857                                 goto cmd_abort;
1858                         }
1859                         break;
1860                 case MMC_BLK_CMD_ERR:
1861                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1862                         if (!mmc_blk_reset(md, card->host, type))
1863                                 break;
1864                         goto cmd_abort;
1865                 case MMC_BLK_RETRY:
1866                         if (retry++ < 5)
1867                                 break;
1868                         /* Fall through */
1869                 case MMC_BLK_ABORT:
1870                         if (!mmc_blk_reset(md, card->host, type))
1871                                 break;
1872                         goto cmd_abort;
1873                 case MMC_BLK_DATA_ERR: {
1874                         int err;
1875
1876                         err = mmc_blk_reset(md, card->host, type);
1877                         if (!err)
1878                                 break;
1879                         if (err == -ENODEV ||
1880                                 mmc_packed_cmd(mq_rq->cmd_type))
1881                                 goto cmd_abort;
1882                         /* Fall through */
1883                 }
1884                 case MMC_BLK_ECC_ERR:
1885                         if (brq->data.blocks > 1) {
1886                                 /* Redo read one sector at a time */
1887                                 pr_warning("%s: retrying using single block read\n",
1888                                            req->rq_disk->disk_name);
1889                                 disable_multi = 1;
1890                                 break;
1891                         }
1892                         /*
1893                          * After an error, we redo I/O one sector at a
1894                          * time, so we only reach here after trying to
1895                          * read a single sector.
1896                          */
1897                         ret = blk_end_request(req, -EIO,
1898                                                 brq->data.blksz);
1899                         if (!ret)
1900                                 goto start_new_req;
1901                         break;
1902                 case MMC_BLK_NOMEDIUM:
1903                         goto cmd_abort;
1904                 default:
1905                         pr_err("%s: Unhandled return value (%d)",
1906                                         req->rq_disk->disk_name, status);
1907                         goto cmd_abort;
1908                 }
1909
1910                 if (ret) {
1911                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1912                                 if (!mq_rq->packed->retries)
1913                                         goto cmd_abort;
1914                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1915                                 mmc_start_req(card->host,
1916                                               &mq_rq->mmc_active, NULL);
1917                         } else {
1918
1919                                 /*
1920                                  * In case of a incomplete request
1921                                  * prepare it again and resend.
1922                                  */
1923                                 mmc_blk_rw_rq_prep(mq_rq, card,
1924                                                 disable_multi, mq);
1925                                 mmc_start_req(card->host,
1926                                                 &mq_rq->mmc_active, NULL);
1927                         }
1928                 }
1929         } while (ret);
1930
1931         return 1;
1932
1933  cmd_abort:
1934         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1935                 mmc_blk_abort_packed_req(mq_rq);
1936         } else {
1937                 if (mmc_card_removed(card))
1938                         req->cmd_flags |= REQ_QUIET;
1939                 while (ret)
1940                         ret = blk_end_request(req, -EIO,
1941                                         blk_rq_cur_bytes(req));
1942         }
1943
1944  start_new_req:
1945         if (rqc) {
1946                 if (mmc_card_removed(card)) {
1947                         rqc->cmd_flags |= REQ_QUIET;
1948                         blk_end_request_all(rqc, -EIO);
1949                 } else {
1950                         /*
1951                          * If current request is packed, it needs to put back.
1952                          */
1953                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1954                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1955
1956                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1957                         mmc_start_req(card->host,
1958                                       &mq->mqrq_cur->mmc_active, NULL);
1959                 }
1960         }
1961
1962         return 0;
1963 }
1964
1965 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1966 {
1967         int ret;
1968         struct mmc_blk_data *md = mq->data;
1969         struct mmc_card *card = md->queue.card;
1970         struct mmc_host *host = card->host;
1971         unsigned long flags;
1972         unsigned int cmd_flags = req ? req->cmd_flags : 0;
1973
1974         if (req && !mq->mqrq_prev->req)
1975                 /* claim host only for the first request */
1976                 mmc_get_card(card);
1977
1978         ret = mmc_blk_part_switch(card, md);
1979         if (ret) {
1980                 if (req) {
1981                         blk_end_request_all(req, -EIO);
1982                 }
1983                 ret = 0;
1984                 goto out;
1985         }
1986
1987         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
1988         if (cmd_flags & REQ_DISCARD) {
1989                 /* complete ongoing async transfer before issuing discard */
1990                 if (card->host->areq)
1991                         mmc_blk_issue_rw_rq(mq, NULL);
1992                 if (req->cmd_flags & REQ_SECURE &&
1993                         !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1994                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
1995                 else
1996                         ret = mmc_blk_issue_discard_rq(mq, req);
1997         } else if (cmd_flags & REQ_FLUSH) {
1998                 /* complete ongoing async transfer before issuing flush */
1999                 if (card->host->areq)
2000                         mmc_blk_issue_rw_rq(mq, NULL);
2001                 ret = mmc_blk_issue_flush(mq, req);
2002         } else {
2003                 if (!req && host->areq) {
2004                         spin_lock_irqsave(&host->context_info.lock, flags);
2005                         host->context_info.is_waiting_last_req = true;
2006                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2007                 }
2008                 ret = mmc_blk_issue_rw_rq(mq, req);
2009         }
2010
2011 out:
2012         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2013              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2014                 /*
2015                  * Release host when there are no more requests
2016                  * and after special request(discard, flush) is done.
2017                  * In case sepecial request, there is no reentry to
2018                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2019                  */
2020                 mmc_put_card(card);
2021         return ret;
2022 }
2023
2024 static inline int mmc_blk_readonly(struct mmc_card *card)
2025 {
2026         return mmc_card_readonly(card) ||
2027                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2028 }
2029
2030 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2031                                               struct device *parent,
2032                                               sector_t size,
2033                                               bool default_ro,
2034                                               const char *subname,
2035                                               int area_type)
2036 {
2037         struct mmc_blk_data *md;
2038         int devidx, ret;
2039
2040         devidx = find_first_zero_bit(dev_use, max_devices);
2041         if (devidx >= max_devices)
2042                 return ERR_PTR(-ENOSPC);
2043         __set_bit(devidx, dev_use);
2044
2045         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2046         if (!md) {
2047                 ret = -ENOMEM;
2048                 goto out;
2049         }
2050
2051         /*
2052          * !subname implies we are creating main mmc_blk_data that will be
2053          * associated with mmc_card with mmc_set_drvdata. Due to device
2054          * partitions, devidx will not coincide with a per-physical card
2055          * index anymore so we keep track of a name index.
2056          */
2057         if (!subname) {
2058                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2059                 __set_bit(md->name_idx, name_use);
2060         } else
2061                 md->name_idx = ((struct mmc_blk_data *)
2062                                 dev_to_disk(parent)->private_data)->name_idx;
2063
2064         md->area_type = area_type;
2065
2066         /*
2067          * Set the read-only status based on the supported commands
2068          * and the write protect switch.
2069          */
2070         md->read_only = mmc_blk_readonly(card);
2071
2072         md->disk = alloc_disk(perdev_minors);
2073         if (md->disk == NULL) {
2074                 ret = -ENOMEM;
2075                 goto err_kfree;
2076         }
2077
2078         spin_lock_init(&md->lock);
2079         INIT_LIST_HEAD(&md->part);
2080         md->usage = 1;
2081
2082         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2083         if (ret)
2084                 goto err_putdisk;
2085
2086         md->queue.issue_fn = mmc_blk_issue_rq;
2087         md->queue.data = md;
2088
2089         md->disk->major = MMC_BLOCK_MAJOR;
2090         md->disk->first_minor = devidx * perdev_minors;
2091         md->disk->fops = &mmc_bdops;
2092         md->disk->private_data = md;
2093         md->disk->queue = md->queue.queue;
2094         md->disk->driverfs_dev = parent;
2095         set_disk_ro(md->disk, md->read_only || default_ro);
2096         if (area_type & MMC_BLK_DATA_AREA_RPMB)
2097                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2098
2099         /*
2100          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2101          *
2102          * - be set for removable media with permanent block devices
2103          * - be unset for removable block devices with permanent media
2104          *
2105          * Since MMC block devices clearly fall under the second
2106          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2107          * should use the block device creation/destruction hotplug
2108          * messages to tell when the card is present.
2109          */
2110
2111         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2112                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2113
2114         if (mmc_card_mmc(card))
2115                 blk_queue_logical_block_size(md->queue.queue,
2116                                              card->ext_csd.data_sector_size);
2117         else
2118                 blk_queue_logical_block_size(md->queue.queue, 512);
2119
2120         set_capacity(md->disk, size);
2121
2122         if (mmc_host_cmd23(card->host)) {
2123                 if (mmc_card_mmc(card) ||
2124                     (mmc_card_sd(card) &&
2125                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2126                         md->flags |= MMC_BLK_CMD23;
2127         }
2128
2129         if (mmc_card_mmc(card) &&
2130             md->flags & MMC_BLK_CMD23 &&
2131             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2132              card->ext_csd.rel_sectors)) {
2133                 md->flags |= MMC_BLK_REL_WR;
2134                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2135         }
2136
2137         if (mmc_card_mmc(card) &&
2138             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2139             (md->flags & MMC_BLK_CMD23) &&
2140             card->ext_csd.packed_event_en) {
2141                 if (!mmc_packed_init(&md->queue, card))
2142                         md->flags |= MMC_BLK_PACKED_CMD;
2143         }
2144
2145         return md;
2146
2147  err_putdisk:
2148         put_disk(md->disk);
2149  err_kfree:
2150         kfree(md);
2151  out:
2152         return ERR_PTR(ret);
2153 }
2154
2155 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2156 {
2157         sector_t size;
2158         struct mmc_blk_data *md;
2159
2160         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2161                 /*
2162                  * The EXT_CSD sector count is in number or 512 byte
2163                  * sectors.
2164                  */
2165                 size = card->ext_csd.sectors;
2166         } else {
2167                 /*
2168                  * The CSD capacity field is in units of read_blkbits.
2169                  * set_capacity takes units of 512 bytes.
2170                  */
2171                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2172         }
2173
2174         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2175                                         MMC_BLK_DATA_AREA_MAIN);
2176         return md;
2177 }
2178
2179 static int mmc_blk_alloc_part(struct mmc_card *card,
2180                               struct mmc_blk_data *md,
2181                               unsigned int part_type,
2182                               sector_t size,
2183                               bool default_ro,
2184                               const char *subname,
2185                               int area_type)
2186 {
2187         char cap_str[10];
2188         struct mmc_blk_data *part_md;
2189
2190         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2191                                     subname, area_type);
2192         if (IS_ERR(part_md))
2193                 return PTR_ERR(part_md);
2194         part_md->part_type = part_type;
2195         list_add(&part_md->part, &md->part);
2196
2197         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2198                         cap_str, sizeof(cap_str));
2199         pr_info("%s: %s %s partition %u %s\n",
2200                part_md->disk->disk_name, mmc_card_id(card),
2201                mmc_card_name(card), part_md->part_type, cap_str);
2202         return 0;
2203 }
2204
2205 /* MMC Physical partitions consist of two boot partitions and
2206  * up to four general purpose partitions.
2207  * For each partition enabled in EXT_CSD a block device will be allocatedi
2208  * to provide access to the partition.
2209  */
2210
2211 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2212 {
2213         int idx, ret = 0;
2214
2215         if (!mmc_card_mmc(card))
2216                 return 0;
2217
2218         for (idx = 0; idx < card->nr_parts; idx++) {
2219                 if (card->part[idx].size) {
2220                         ret = mmc_blk_alloc_part(card, md,
2221                                 card->part[idx].part_cfg,
2222                                 card->part[idx].size >> 9,
2223                                 card->part[idx].force_ro,
2224                                 card->part[idx].name,
2225                                 card->part[idx].area_type);
2226                         if (ret)
2227                                 return ret;
2228                 }
2229         }
2230
2231         return ret;
2232 }
2233
2234 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2235 {
2236         struct mmc_card *card;
2237
2238         if (md) {
2239                 /*
2240                  * Flush remaining requests and free queues. It
2241                  * is freeing the queue that stops new requests
2242                  * from being accepted.
2243                  */
2244                 card = md->queue.card;
2245                 mmc_cleanup_queue(&md->queue);
2246                 if (md->flags & MMC_BLK_PACKED_CMD)
2247                         mmc_packed_clean(&md->queue);
2248                 if (md->disk->flags & GENHD_FL_UP) {
2249                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2250                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2251                                         card->ext_csd.boot_ro_lockable)
2252                                 device_remove_file(disk_to_dev(md->disk),
2253                                         &md->power_ro_lock);
2254
2255                         del_gendisk(md->disk);
2256                 }
2257                 mmc_blk_put(md);
2258         }
2259 }
2260
2261 static void mmc_blk_remove_parts(struct mmc_card *card,
2262                                  struct mmc_blk_data *md)
2263 {
2264         struct list_head *pos, *q;
2265         struct mmc_blk_data *part_md;
2266
2267         __clear_bit(md->name_idx, name_use);
2268         list_for_each_safe(pos, q, &md->part) {
2269                 part_md = list_entry(pos, struct mmc_blk_data, part);
2270                 list_del(pos);
2271                 mmc_blk_remove_req(part_md);
2272         }
2273 }
2274
2275 static int mmc_add_disk(struct mmc_blk_data *md)
2276 {
2277         int ret;
2278         struct mmc_card *card = md->queue.card;
2279
2280         add_disk(md->disk);
2281         md->force_ro.show = force_ro_show;
2282         md->force_ro.store = force_ro_store;
2283         sysfs_attr_init(&md->force_ro.attr);
2284         md->force_ro.attr.name = "force_ro";
2285         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2286         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2287         if (ret)
2288                 goto force_ro_fail;
2289
2290         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2291              card->ext_csd.boot_ro_lockable) {
2292                 umode_t mode;
2293
2294                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2295                         mode = S_IRUGO;
2296                 else
2297                         mode = S_IRUGO | S_IWUSR;
2298
2299                 md->power_ro_lock.show = power_ro_lock_show;
2300                 md->power_ro_lock.store = power_ro_lock_store;
2301                 sysfs_attr_init(&md->power_ro_lock.attr);
2302                 md->power_ro_lock.attr.mode = mode;
2303                 md->power_ro_lock.attr.name =
2304                                         "ro_lock_until_next_power_on";
2305                 ret = device_create_file(disk_to_dev(md->disk),
2306                                 &md->power_ro_lock);
2307                 if (ret)
2308                         goto power_ro_lock_fail;
2309         }
2310         return ret;
2311
2312 power_ro_lock_fail:
2313         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2314 force_ro_fail:
2315         del_gendisk(md->disk);
2316
2317         return ret;
2318 }
2319
2320 #define CID_MANFID_SANDISK      0x2
2321 #define CID_MANFID_TOSHIBA      0x11
2322 #define CID_MANFID_MICRON       0x13
2323 #define CID_MANFID_SAMSUNG      0x15
2324
2325 static const struct mmc_fixup blk_fixups[] =
2326 {
2327         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2328                   MMC_QUIRK_INAND_CMD38),
2329         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2330                   MMC_QUIRK_INAND_CMD38),
2331         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2332                   MMC_QUIRK_INAND_CMD38),
2333         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2334                   MMC_QUIRK_INAND_CMD38),
2335         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2336                   MMC_QUIRK_INAND_CMD38),
2337
2338         /*
2339          * Some MMC cards experience performance degradation with CMD23
2340          * instead of CMD12-bounded multiblock transfers. For now we'll
2341          * black list what's bad...
2342          * - Certain Toshiba cards.
2343          *
2344          * N.B. This doesn't affect SD cards.
2345          */
2346         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2347                   MMC_QUIRK_BLK_NO_CMD23),
2348         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2349                   MMC_QUIRK_BLK_NO_CMD23),
2350         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2351                   MMC_QUIRK_BLK_NO_CMD23),
2352
2353         /*
2354          * Some Micron MMC cards needs longer data read timeout than
2355          * indicated in CSD.
2356          */
2357         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2358                   MMC_QUIRK_LONG_READ_TIME),
2359
2360         /*
2361          * On these Samsung MoviNAND parts, performing secure erase or
2362          * secure trim can result in unrecoverable corruption due to a
2363          * firmware bug.
2364          */
2365         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2366                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2367         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2368                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2369         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2370                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2371         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2372                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2373         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2374                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2375         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2376                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2377         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2378                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2379         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2380                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2381
2382         END_FIXUP
2383 };
2384
2385 static int mmc_blk_probe(struct mmc_card *card)
2386 {
2387         struct mmc_blk_data *md, *part_md;
2388         char cap_str[10];
2389
2390         /*
2391          * Check that the card supports the command class(es) we need.
2392          */
2393         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2394                 return -ENODEV;
2395
2396         md = mmc_blk_alloc(card);
2397         if (IS_ERR(md))
2398                 return PTR_ERR(md);
2399
2400         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2401                         cap_str, sizeof(cap_str));
2402         pr_info("%s: %s %s %s %s\n",
2403                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2404                 cap_str, md->read_only ? "(ro)" : "");
2405
2406         if (mmc_blk_alloc_parts(card, md))
2407                 goto out;
2408
2409         mmc_set_drvdata(card, md);
2410         mmc_fixup_device(card, blk_fixups);
2411
2412         if (mmc_add_disk(md))
2413                 goto out;
2414
2415         list_for_each_entry(part_md, &md->part, part) {
2416                 if (mmc_add_disk(part_md))
2417                         goto out;
2418         }
2419
2420         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2421         pm_runtime_use_autosuspend(&card->dev);
2422
2423         /*
2424          * Don't enable runtime PM for SD-combo cards here. Leave that
2425          * decision to be taken during the SDIO init sequence instead.
2426          */
2427         if (card->type != MMC_TYPE_SD_COMBO) {
2428                 pm_runtime_set_active(&card->dev);
2429                 pm_runtime_enable(&card->dev);
2430         }
2431
2432         return 0;
2433
2434  out:
2435         mmc_blk_remove_parts(card, md);
2436         mmc_blk_remove_req(md);
2437         return 0;
2438 }
2439
2440 static void mmc_blk_remove(struct mmc_card *card)
2441 {
2442         struct mmc_blk_data *md = mmc_get_drvdata(card);
2443
2444         mmc_blk_remove_parts(card, md);
2445         pm_runtime_get_sync(&card->dev);
2446         mmc_claim_host(card->host);
2447         mmc_blk_part_switch(card, md);
2448         mmc_release_host(card->host);
2449         if (card->type != MMC_TYPE_SD_COMBO)
2450                 pm_runtime_disable(&card->dev);
2451         pm_runtime_put_noidle(&card->dev);
2452         mmc_blk_remove_req(md);
2453         mmc_set_drvdata(card, NULL);
2454 }
2455
2456 static int _mmc_blk_suspend(struct mmc_card *card)
2457 {
2458         struct mmc_blk_data *part_md;
2459         struct mmc_blk_data *md = mmc_get_drvdata(card);
2460
2461         if (md) {
2462                 mmc_queue_suspend(&md->queue);
2463                 list_for_each_entry(part_md, &md->part, part) {
2464                         mmc_queue_suspend(&part_md->queue);
2465                 }
2466         }
2467         return 0;
2468 }
2469
2470 static void mmc_blk_shutdown(struct mmc_card *card)
2471 {
2472         _mmc_blk_suspend(card);
2473 }
2474
2475 #ifdef CONFIG_PM
2476 static int mmc_blk_suspend(struct mmc_card *card)
2477 {
2478         return _mmc_blk_suspend(card);
2479 }
2480
2481 static int mmc_blk_resume(struct mmc_card *card)
2482 {
2483         struct mmc_blk_data *part_md;
2484         struct mmc_blk_data *md = mmc_get_drvdata(card);
2485
2486         if (md) {
2487                 /*
2488                  * Resume involves the card going into idle state,
2489                  * so current partition is always the main one.
2490                  */
2491                 md->part_curr = md->part_type;
2492                 mmc_queue_resume(&md->queue);
2493                 list_for_each_entry(part_md, &md->part, part) {
2494                         mmc_queue_resume(&part_md->queue);
2495                 }
2496         }
2497         return 0;
2498 }
2499 #else
2500 #define mmc_blk_suspend NULL
2501 #define mmc_blk_resume  NULL
2502 #endif
2503
2504 static struct mmc_driver mmc_driver = {
2505         .drv            = {
2506                 .name   = "mmcblk",
2507         },
2508         .probe          = mmc_blk_probe,
2509         .remove         = mmc_blk_remove,
2510         .suspend        = mmc_blk_suspend,
2511         .resume         = mmc_blk_resume,
2512         .shutdown       = mmc_blk_shutdown,
2513 };
2514
2515 static int __init mmc_blk_init(void)
2516 {
2517         int res;
2518
2519         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2520                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2521
2522         max_devices = 256 / perdev_minors;
2523
2524         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2525         if (res)
2526                 goto out;
2527
2528         res = mmc_register_driver(&mmc_driver);
2529         if (res)
2530                 goto out2;
2531
2532         return 0;
2533  out2:
2534         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2535  out:
2536         return res;
2537 }
2538
2539 static void __exit mmc_blk_exit(void)
2540 {
2541         mmc_unregister_driver(&mmc_driver);
2542         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2543 }
2544
2545 module_init(mmc_blk_init);
2546 module_exit(mmc_blk_exit);
2547
2548 MODULE_LICENSE("GPL");
2549 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2550