drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50 #ifdef MODULE_PARAM_PREFIX
  51 #undef MODULE_PARAM_PREFIX
  52 #endif
  53 #define MODULE_PARAM_PREFIX "mmcblk."
  54
  55 #define INAND_CMD38_ARG_EXT_CSD  113
  56 #define INAND_CMD38_ARG_ERASE    0x00
  57 #define INAND_CMD38_ARG_TRIM     0x01
  58 #define INAND_CMD38_ARG_SECERASE 0x80
  59 #define INAND_CMD38_ARG_SECTRIM1 0x81
  60 #define INAND_CMD38_ARG_SECTRIM2 0x88
  61 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  62 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  63 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  64
  65 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
  66                                   (req->cmd_flags & REQ_META)) && \
  67                                   (rq_data_dir(req) == WRITE))
  68 #define PACKED_CMD_VER  0x01
  69 #define PACKED_CMD_WR   0x02
  70
  71 static DEFINE_MUTEX(block_mutex);
  72
  73 /*
  74  * The defaults come from config options but can be overriden by module
  75  * or bootarg options.
  76  */
  77 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  78
  79 /*
  80  * We've only got one major, so number of mmcblk devices is
  81  * limited to 256 / number of minors per device.
  82  */
  83 static int max_devices;
  84
  85 /* 256 minors, so at most 256 separate devices */
  86 static DECLARE_BITMAP(dev_use, 256);
  87 static DECLARE_BITMAP(name_use, 256);
  88
  89 /*
  90  * There is one mmc_blk_data per slot.
  91  */
  92 struct mmc_blk_data {
  93         spinlock_t      lock;
  94         struct gendisk  *disk;
  95         struct mmc_queue queue;
  96         struct list_head part;
  97
  98         unsigned int    flags;
  99 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 100 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 101 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 102
 103         unsigned int    usage;
 104         unsigned int    read_only;
 105         unsigned int    part_type;
 106         unsigned int    name_idx;
 107         unsigned int    reset_done;
 108 #define MMC_BLK_READ            BIT(0)
 109 #define MMC_BLK_WRITE           BIT(1)
 110 #define MMC_BLK_DISCARD         BIT(2)
 111 #define MMC_BLK_SECDISCARD      BIT(3)
 112
 113         /*
 114          * Only set in main mmc_blk_data associated
 115          * with mmc_card with mmc_set_drvdata, and keeps
 116          * track of the current selected device partition.
 117          */
 118         unsigned int    part_curr;
 119         struct device_attribute force_ro;
 120         struct device_attribute power_ro_lock;
 121         int     area_type;
 122 };
 123
 124 static DEFINE_MUTEX(open_lock);
 125
 126 enum {
 127         MMC_PACKED_NR_IDX = -1,
 128         MMC_PACKED_NR_ZERO,
 129         MMC_PACKED_NR_SINGLE,
 130 };
 131
 132 module_param(perdev_minors, int, 0444);
 133 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 134
 135 static inline int mmc_blk_part_switch(struct mmc_card *card,
 136                                       struct mmc_blk_data *md);
 137 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 138
 139 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 140 {
 141         struct mmc_packed *packed = mqrq->packed;
 142
 143         BUG_ON(!packed);
 144
 145         mqrq->cmd_type = MMC_PACKED_NONE;
 146         packed->nr_entries = MMC_PACKED_NR_ZERO;
 147         packed->idx_failure = MMC_PACKED_NR_IDX;
 148         packed->retries = 0;
 149         packed->blocks = 0;
 150 }
 151
 152 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 153 {
 154         struct mmc_blk_data *md;
 155
 156         mutex_lock(&open_lock);
 157         md = disk->private_data;
 158         if (md && md->usage == 0)
 159                 md = NULL;
 160         if (md)
 161                 md->usage++;
 162         mutex_unlock(&open_lock);
 163
 164         return md;
 165 }
 166
 167 static inline int mmc_get_devidx(struct gendisk *disk)
 168 {
 169         int devmaj = MAJOR(disk_devt(disk));
 170         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 171
 172         if (!devmaj)
 173                 devidx = disk->first_minor / perdev_minors;
 174         return devidx;
 175 }
 176
 177 static void mmc_blk_put(struct mmc_blk_data *md)
 178 {
 179         mutex_lock(&open_lock);
 180         md->usage--;
 181         if (md->usage == 0) {
 182                 int devidx = mmc_get_devidx(md->disk);
 183                 blk_cleanup_queue(md->queue.queue);
 184
 185                 __clear_bit(devidx, dev_use);
 186
 187                 put_disk(md->disk);
 188                 kfree(md);
 189         }
 190         mutex_unlock(&open_lock);
 191 }
 192
 193 static ssize_t power_ro_lock_show(struct device *dev,
 194                 struct device_attribute *attr, char *buf)
 195 {
 196         int ret;
 197         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 198         struct mmc_card *card = md->queue.card;
 199         int locked = 0;
 200
 201         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 202                 locked = 2;
 203         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 204                 locked = 1;
 205
 206         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 207
 208         return ret;
 209 }
 210
 211 static ssize_t power_ro_lock_store(struct device *dev,
 212                 struct device_attribute *attr, const char *buf, size_t count)
 213 {
 214         int ret;
 215         struct mmc_blk_data *md, *part_md;
 216         struct mmc_card *card;
 217         unsigned long set;
 218
 219         if (kstrtoul(buf, 0, &set))
 220                 return -EINVAL;
 221
 222         if (set != 1)
 223                 return count;
 224
 225         md = mmc_blk_get(dev_to_disk(dev));
 226         card = md->queue.card;
 227
 228         mmc_get_card(card);
 229
 230         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 231                                 card->ext_csd.boot_ro_lock |
 232                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 233                                 card->ext_csd.part_time);
 234         if (ret)
 235                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 236         else
 237                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 238
 239         mmc_put_card(card);
 240
 241         if (!ret) {
 242                 pr_info("%s: Locking boot partition ro until next power on\n",
 243                         md->disk->disk_name);
 244                 set_disk_ro(md->disk, 1);
 245
 246                 list_for_each_entry(part_md, &md->part, part)
 247                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 248                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 249                                 set_disk_ro(part_md->disk, 1);
 250                         }
 251         }
 252
 253         mmc_blk_put(md);
 254         return count;
 255 }
 256
 257 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 258                              char *buf)
 259 {
 260         int ret;
 261         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 262
 263         ret = snprintf(buf, PAGE_SIZE, "%d",
 264                        get_disk_ro(dev_to_disk(dev)) ^
 265                        md->read_only);
 266         mmc_blk_put(md);
 267         return ret;
 268 }
 269
 270 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 271                               const char *buf, size_t count)
 272 {
 273         int ret;
 274         char *end;
 275         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 276         unsigned long set = simple_strtoul(buf, &end, 0);
 277         if (end == buf) {
 278                 ret = -EINVAL;
 279                 goto out;
 280         }
 281
 282         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 283         ret = count;
 284 out:
 285         mmc_blk_put(md);
 286         return ret;
 287 }
 288
 289 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 290 {
 291         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 292         int ret = -ENXIO;
 293
 294         mutex_lock(&block_mutex);
 295         if (md) {
 296                 if (md->usage == 2)
 297                         check_disk_change(bdev);
 298                 ret = 0;
 299
 300                 if ((mode & FMODE_WRITE) && md->read_only) {
 301                         mmc_blk_put(md);
 302                         ret = -EROFS;
 303                 }
 304         }
 305         mutex_unlock(&block_mutex);
 306
 307         return ret;
 308 }
 309
 310 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 311 {
 312         struct mmc_blk_data *md = disk->private_data;
 313
 314         mutex_lock(&block_mutex);
 315         mmc_blk_put(md);
 316         mutex_unlock(&block_mutex);
 317 }
 318
 319 static int
 320 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 321 {
 322         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 323         geo->heads = 4;
 324         geo->sectors = 16;
 325         return 0;
 326 }
 327
 328 struct mmc_blk_ioc_data {
 329         struct mmc_ioc_cmd ic;
 330         unsigned char *buf;
 331         u64 buf_bytes;
 332 };
 333
 334 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 335         struct mmc_ioc_cmd __user *user)
 336 {
 337         struct mmc_blk_ioc_data *idata;
 338         int err;
 339
 340         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 341         if (!idata) {
 342                 err = -ENOMEM;
 343                 goto out;
 344         }
 345
 346         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 347                 err = -EFAULT;
 348                 goto idata_err;
 349         }
 350
 351         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 352         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 353                 err = -EOVERFLOW;
 354                 goto idata_err;
 355         }
 356
 357         if (!idata->buf_bytes)
 358                 return idata;
 359
 360         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 361         if (!idata->buf) {
 362                 err = -ENOMEM;
 363                 goto idata_err;
 364         }
 365
 366         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 367                                         idata->ic.data_ptr, idata->buf_bytes)) {
 368                 err = -EFAULT;
 369                 goto copy_err;
 370         }
 371
 372         return idata;
 373
 374 copy_err:
 375         kfree(idata->buf);
 376 idata_err:
 377         kfree(idata);
 378 out:
 379         return ERR_PTR(err);
 380 }
 381
 382 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 383                                        u32 retries_max)
 384 {
 385         int err;
 386         u32 retry_count = 0;
 387
 388         if (!status || !retries_max)
 389                 return -EINVAL;
 390
 391         do {
 392                 err = get_card_status(card, status, 5);
 393                 if (err)
 394                         break;
 395
 396                 if (!R1_STATUS(*status) &&
 397                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 398                         break; /* RPMB programming operation complete */
 399
 400                 /*
 401                  * Rechedule to give the MMC device a chance to continue
 402                  * processing the previous command without being polled too
 403                  * frequently.
 404                  */
 405                 usleep_range(1000, 5000);
 406         } while (++retry_count < retries_max);
 407
 408         if (retry_count == retries_max)
 409                 err = -EPERM;
 410
 411         return err;
 412 }
 413
 414 static int ioctl_do_sanitize(struct mmc_card *card)
 415 {
 416         int err;
 417
 418         if (!mmc_can_sanitize(card)) {
 419                         pr_warn("%s: %s - SANITIZE is not supported\n",
 420                                 mmc_hostname(card->host), __func__);
 421                         err = -EOPNOTSUPP;
 422                         goto out;
 423         }
 424
 425         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 426                 mmc_hostname(card->host), __func__);
 427
 428         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 429                                         EXT_CSD_SANITIZE_START, 1,
 430                                         MMC_SANITIZE_REQ_TIMEOUT);
 431
 432         if (err)
 433                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 434                        mmc_hostname(card->host), __func__, err);
 435
 436         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 437                                              __func__);
 438 out:
 439         return err;
 440 }
 441
 442 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 443         struct mmc_ioc_cmd __user *ic_ptr)
 444 {
 445         struct mmc_blk_ioc_data *idata;
 446         struct mmc_blk_data *md;
 447         struct mmc_card *card;
 448         struct mmc_command cmd = {0};
 449         struct mmc_data data = {0};
 450         struct mmc_request mrq = {NULL};
 451         struct scatterlist sg;
 452         int err;
 453         int is_rpmb = false;
 454         u32 status = 0;
 455
 456         /*
 457          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 458          * whole block device, not on a partition.  This prevents overspray
 459          * between sibling partitions.
 460          */
 461         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 462                 return -EPERM;
 463
 464         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 465         if (IS_ERR(idata))
 466                 return PTR_ERR(idata);
 467
 468         md = mmc_blk_get(bdev->bd_disk);
 469         if (!md) {
 470                 err = -EINVAL;
 471                 goto cmd_err;
 472         }
 473
 474         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 475                 is_rpmb = true;
 476
 477         card = md->queue.card;
 478         if (IS_ERR(card)) {
 479                 err = PTR_ERR(card);
 480                 goto cmd_done;
 481         }
 482
 483         cmd.opcode = idata->ic.opcode;
 484         cmd.arg = idata->ic.arg;
 485         cmd.flags = idata->ic.flags;
 486
 487         if (idata->buf_bytes) {
 488                 data.sg = &sg;
 489                 data.sg_len = 1;
 490                 data.blksz = idata->ic.blksz;
 491                 data.blocks = idata->ic.blocks;
 492
 493                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 494
 495                 if (idata->ic.write_flag)
 496                         data.flags = MMC_DATA_WRITE;
 497                 else
 498                         data.flags = MMC_DATA_READ;
 499
 500                 /* data.flags must already be set before doing this. */
 501                 mmc_set_data_timeout(&data, card);
 502
 503                 /* Allow overriding the timeout_ns for empirical tuning. */
 504                 if (idata->ic.data_timeout_ns)
 505                         data.timeout_ns = idata->ic.data_timeout_ns;
 506
 507                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 508                         /*
 509                          * Pretend this is a data transfer and rely on the
 510                          * host driver to compute timeout.  When all host
 511                          * drivers support cmd.cmd_timeout for R1B, this
 512                          * can be changed to:
 513                          *
 514                          *     mrq.data = NULL;
 515                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 516                          */
 517                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 518                 }
 519
 520                 mrq.data = &data;
 521         }
 522
 523         mrq.cmd = &cmd;
 524
 525         mmc_get_card(card);
 526
 527         err = mmc_blk_part_switch(card, md);
 528         if (err)
 529                 goto cmd_rel_host;
 530
 531         if (idata->ic.is_acmd) {
 532                 err = mmc_app_cmd(card->host, card);
 533                 if (err)
 534                         goto cmd_rel_host;
 535         }
 536
 537         if (is_rpmb) {
 538                 err = mmc_set_blockcount(card, data.blocks,
 539                         idata->ic.write_flag & (1 << 31));
 540                 if (err)
 541                         goto cmd_rel_host;
 542         }
 543
 544         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 545             (cmd.opcode == MMC_SWITCH)) {
 546                 err = ioctl_do_sanitize(card);
 547
 548                 if (err)
 549                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 550                                __func__, err);
 551
 552                 goto cmd_rel_host;
 553         }
 554
 555         mmc_wait_for_req(card->host, &mrq);
 556
 557         if (cmd.error) {
 558                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 559                                                 __func__, cmd.error);
 560                 err = cmd.error;
 561                 goto cmd_rel_host;
 562         }
 563         if (data.error) {
 564                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 565                                                 __func__, data.error);
 566                 err = data.error;
 567                 goto cmd_rel_host;
 568         }
 569
 570         /*
 571          * According to the SD specs, some commands require a delay after
 572          * issuing the command.
 573          */
 574         if (idata->ic.postsleep_min_us)
 575                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 576
 577         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 578                 err = -EFAULT;
 579                 goto cmd_rel_host;
 580         }
 581
 582         if (!idata->ic.write_flag) {
 583                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 584                                                 idata->buf, idata->buf_bytes)) {
 585                         err = -EFAULT;
 586                         goto cmd_rel_host;
 587                 }
 588         }
 589
 590         if (is_rpmb) {
 591                 /*
 592                  * Ensure RPMB command has completed by polling CMD13
 593                  * "Send Status".
 594                  */
 595                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 596                 if (err)
 597                         dev_err(mmc_dev(card->host),
 598                                         "%s: Card Status=0x%08X, error %d\n",
 599                                         __func__, status, err);
 600         }
 601
 602 cmd_rel_host:
 603         mmc_put_card(card);
 604
 605 cmd_done:
 606         mmc_blk_put(md);
 607 cmd_err:
 608         kfree(idata->buf);
 609         kfree(idata);
 610         return err;
 611 }
 612
 613 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 614         unsigned int cmd, unsigned long arg)
 615 {
 616         int ret = -EINVAL;
 617         if (cmd == MMC_IOC_CMD)
 618                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 619         return ret;
 620 }
 621
 622 #ifdef CONFIG_COMPAT
 623 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 624         unsigned int cmd, unsigned long arg)
 625 {
 626         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 627 }
 628 #endif
 629
 630 static const struct block_device_operations mmc_bdops = {
 631         .open                   = mmc_blk_open,
 632         .release                = mmc_blk_release,
 633         .getgeo                 = mmc_blk_getgeo,
 634         .owner                  = THIS_MODULE,
 635         .ioctl                  = mmc_blk_ioctl,
 636 #ifdef CONFIG_COMPAT
 637         .compat_ioctl           = mmc_blk_compat_ioctl,
 638 #endif
 639 };
 640
 641 static inline int mmc_blk_part_switch(struct mmc_card *card,
 642                                       struct mmc_blk_data *md)
 643 {
 644         int ret;
 645         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
 646
 647         if (main_md->part_curr == md->part_type)
 648                 return 0;
 649
 650         if (mmc_card_mmc(card)) {
 651                 u8 part_config = card->ext_csd.part_config;
 652
 653                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 654                 part_config |= md->part_type;
 655
 656                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 657                                  EXT_CSD_PART_CONFIG, part_config,
 658                                  card->ext_csd.part_time);
 659                 if (ret)
 660                         return ret;
 661
 662                 card->ext_csd.part_config = part_config;
 663         }
 664
 665         main_md->part_curr = md->part_type;
 666         return 0;
 667 }
 668
 669 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 670 {
 671         int err;
 672         u32 result;
 673         __be32 *blocks;
 674
 675         struct mmc_request mrq = {NULL};
 676         struct mmc_command cmd = {0};
 677         struct mmc_data data = {0};
 678
 679         struct scatterlist sg;
 680
 681         cmd.opcode = MMC_APP_CMD;
 682         cmd.arg = card->rca << 16;
 683         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 684
 685         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 686         if (err)
 687                 return (u32)-1;
 688         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 689                 return (u32)-1;
 690
 691         memset(&cmd, 0, sizeof(struct mmc_command));
 692
 693         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 694         cmd.arg = 0;
 695         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 696
 697         data.blksz = 4;
 698         data.blocks = 1;
 699         data.flags = MMC_DATA_READ;
 700         data.sg = &sg;
 701         data.sg_len = 1;
 702         mmc_set_data_timeout(&data, card);
 703
 704         mrq.cmd = &cmd;
 705         mrq.data = &data;
 706
 707         blocks = kmalloc(4, GFP_KERNEL);
 708         if (!blocks)
 709                 return (u32)-1;
 710
 711         sg_init_one(&sg, blocks, 4);
 712
 713         mmc_wait_for_req(card->host, &mrq);
 714
 715         result = ntohl(*blocks);
 716         kfree(blocks);
 717
 718         if (cmd.error || data.error)
 719                 result = (u32)-1;
 720
 721         return result;
 722 }
 723
 724 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 725 {
 726         struct mmc_command cmd = {0};
 727         int err;
 728
 729         cmd.opcode = MMC_SEND_STATUS;
 730         if (!mmc_host_is_spi(card->host))
 731                 cmd.arg = card->rca << 16;
 732         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 733         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 734         if (err == 0)
 735                 *status = cmd.resp[0];
 736         return err;
 737 }
 738
 739 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 740                 bool hw_busy_detect, struct request *req, int *gen_err)
 741 {
 742         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 743         int err = 0;
 744         u32 status;
 745
 746         do {
 747                 err = get_card_status(card, &status, 5);
 748                 if (err) {
 749                         pr_err("%s: error %d requesting status\n",
 750                                req->rq_disk->disk_name, err);
 751                         return err;
 752                 }
 753
 754                 if (status & R1_ERROR) {
 755                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 756                                 req->rq_disk->disk_name, __func__, status);
 757                         *gen_err = 1;
 758                 }
 759
 760                 /* We may rely on the host hw to handle busy detection.*/
 761                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 762                         hw_busy_detect)
 763                         break;
 764
 765                 /*
 766                  * Timeout if the device never becomes ready for data and never
 767                  * leaves the program state.
 768                  */
 769                 if (time_after(jiffies, timeout)) {
 770                         pr_err("%s: Card stuck in programming state! %s %s\n",
 771                                 mmc_hostname(card->host),
 772                                 req->rq_disk->disk_name, __func__);
 773                         return -ETIMEDOUT;
 774                 }
 775
 776                 /*
 777                  * Some cards mishandle the status bits,
 778                  * so make sure to check both the busy
 779                  * indication and the card state.
 780                  */
 781         } while (!(status & R1_READY_FOR_DATA) ||
 782                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 783
 784         return err;
 785 }
 786
 787 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 788                 struct request *req, int *gen_err, u32 *stop_status)
 789 {
 790         struct mmc_host *host = card->host;
 791         struct mmc_command cmd = {0};
 792         int err;
 793         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 794
 795         /*
 796          * Normally we use R1B responses for WRITE, but in cases where the host
 797          * has specified a max_busy_timeout we need to validate it. A failure
 798          * means we need to prevent the host from doing hw busy detection, which
 799          * is done by converting to a R1 response instead.
 800          */
 801         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 802                 use_r1b_resp = false;
 803
 804         cmd.opcode = MMC_STOP_TRANSMISSION;
 805         if (use_r1b_resp) {
 806                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 807                 cmd.busy_timeout = timeout_ms;
 808         } else {
 809                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 810         }
 811
 812         err = mmc_wait_for_cmd(host, &cmd, 5);
 813         if (err)
 814                 return err;
 815
 816         *stop_status = cmd.resp[0];
 817
 818         /* No need to check card status in case of READ. */
 819         if (rq_data_dir(req) == READ)
 820                 return 0;
 821
 822         if (!mmc_host_is_spi(host) &&
 823                 (*stop_status & R1_ERROR)) {
 824                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 825                         req->rq_disk->disk_name, __func__, *stop_status);
 826                 *gen_err = 1;
 827         }
 828
 829         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 830 }
 831
 832 #define ERR_NOMEDIUM    3
 833 #define ERR_RETRY       2
 834 #define ERR_ABORT       1
 835 #define ERR_CONTINUE    0
 836
 837 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 838         bool status_valid, u32 status)
 839 {
 840         switch (error) {
 841         case -EILSEQ:
 842                 /* response crc error, retry the r/w cmd */
 843                 pr_err("%s: %s sending %s command, card status %#x\n",
 844                         req->rq_disk->disk_name, "response CRC error",
 845                         name, status);
 846                 return ERR_RETRY;
 847
 848         case -ETIMEDOUT:
 849                 pr_err("%s: %s sending %s command, card status %#x\n",
 850                         req->rq_disk->disk_name, "timed out", name, status);
 851
 852                 /* If the status cmd initially failed, retry the r/w cmd */
 853                 if (!status_valid)
 854                         return ERR_RETRY;
 855
 856                 /*
 857                  * If it was a r/w cmd crc error, or illegal command
 858                  * (eg, issued in wrong state) then retry - we should
 859                  * have corrected the state problem above.
 860                  */
 861                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 862                         return ERR_RETRY;
 863
 864                 /* Otherwise abort the command */
 865                 return ERR_ABORT;
 866
 867         default:
 868                 /* We don't understand the error code the driver gave us */
 869                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 870                        req->rq_disk->disk_name, error, status);
 871                 return ERR_ABORT;
 872         }
 873 }
 874
 875 /*
 876  * Initial r/w and stop cmd error recovery.
 877  * We don't know whether the card received the r/w cmd or not, so try to
 878  * restore things back to a sane state.  Essentially, we do this as follows:
 879  * - Obtain card status.  If the first attempt to obtain card status fails,
 880  *   the status word will reflect the failed status cmd, not the failed
 881  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 882  *   longer communicate with the card.
 883  * - Check the card state.  If the card received the cmd but there was a
 884  *   transient problem with the response, it might still be in a data transfer
 885  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 886  * - If the r/w cmd failed due to a response CRC error, it was probably
 887  *   transient, so retry the cmd.
 888  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 889  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 890  *   illegal cmd, retry.
 891  * Otherwise we don't understand what happened, so abort.
 892  */
 893 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 894         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 895 {
 896         bool prev_cmd_status_valid = true;
 897         u32 status, stop_status = 0;
 898         int err, retry;
 899
 900         if (mmc_card_removed(card))
 901                 return ERR_NOMEDIUM;
 902
 903         /*
 904          * Try to get card status which indicates both the card state
 905          * and why there was no response.  If the first attempt fails,
 906          * we can't be sure the returned status is for the r/w command.
 907          */
 908         for (retry = 2; retry >= 0; retry--) {
 909                 err = get_card_status(card, &status, 0);
 910                 if (!err)
 911                         break;
 912
 913                 prev_cmd_status_valid = false;
 914                 pr_err("%s: error %d sending status command, %sing\n",
 915                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 916         }
 917
 918         /* We couldn't get a response from the card.  Give up. */
 919         if (err) {
 920                 /* Check if the card is removed */
 921                 if (mmc_detect_card_removed(card->host))
 922                         return ERR_NOMEDIUM;
 923                 return ERR_ABORT;
 924         }
 925
 926         /* Flag ECC errors */
 927         if ((status & R1_CARD_ECC_FAILED) ||
 928             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 929             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 930                 *ecc_err = 1;
 931
 932         /* Flag General errors */
 933         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 934                 if ((status & R1_ERROR) ||
 935                         (brq->stop.resp[0] & R1_ERROR)) {
 936                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 937                                req->rq_disk->disk_name, __func__,
 938                                brq->stop.resp[0], status);
 939                         *gen_err = 1;
 940                 }
 941
 942         /*
 943          * Check the current card state.  If it is in some data transfer
 944          * mode, tell it to stop (and hopefully transition back to TRAN.)
 945          */
 946         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 947             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 948                 err = send_stop(card,
 949                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
 950                         req, gen_err, &stop_status);
 951                 if (err) {
 952                         pr_err("%s: error %d sending stop command\n",
 953                                req->rq_disk->disk_name, err);
 954                         /*
 955                          * If the stop cmd also timed out, the card is probably
 956                          * not present, so abort. Other errors are bad news too.
 957                          */
 958                         return ERR_ABORT;
 959                 }
 960
 961                 if (stop_status & R1_CARD_ECC_FAILED)
 962                         *ecc_err = 1;
 963         }
 964
 965         /* Check for set block count errors */
 966         if (brq->sbc.error)
 967                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 968                                 prev_cmd_status_valid, status);
 969
 970         /* Check for r/w command errors */
 971         if (brq->cmd.error)
 972                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 973                                 prev_cmd_status_valid, status);
 974
 975         /* Data errors */
 976         if (!brq->stop.error)
 977                 return ERR_CONTINUE;
 978
 979         /* Now for stop errors.  These aren't fatal to the transfer. */
 980         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 981                req->rq_disk->disk_name, brq->stop.error,
 982                brq->cmd.resp[0], status);
 983
 984         /*
 985          * Subsitute in our own stop status as this will give the error
 986          * state which happened during the execution of the r/w command.
 987          */
 988         if (stop_status) {
 989                 brq->stop.resp[0] = stop_status;
 990                 brq->stop.error = 0;
 991         }
 992         return ERR_CONTINUE;
 993 }
 994
 995 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 996                          int type)
 997 {
 998         int err;
 999
1000         if (md->reset_done & type)
1001                 return -EEXIST;
1002
1003         md->reset_done |= type;
1004         err = mmc_hw_reset(host);
1005         /* Ensure we switch back to the correct partition */
1006         if (err != -EOPNOTSUPP) {
1007                 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
1008                 int part_err;
1009
1010                 main_md->part_curr = main_md->part_type;
1011                 part_err = mmc_blk_part_switch(host->card, md);
1012                 if (part_err) {
1013                         /*
1014                          * We have failed to get back into the correct
1015                          * partition, so we need to abort the whole request.
1016                          */
1017                         return -ENODEV;
1018                 }
1019         }
1020         return err;
1021 }
1022
1023 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1024 {
1025         md->reset_done &= ~type;
1026 }
1027
1028 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1029 {
1030         struct mmc_blk_data *md = mq->data;
1031         struct mmc_card *card = md->queue.card;
1032         unsigned int from, nr, arg;
1033         int err = 0, type = MMC_BLK_DISCARD;
1034
1035         if (!mmc_can_erase(card)) {
1036                 err = -EOPNOTSUPP;
1037                 goto out;
1038         }
1039
1040         from = blk_rq_pos(req);
1041         nr = blk_rq_sectors(req);
1042
1043         if (mmc_can_discard(card))
1044                 arg = MMC_DISCARD_ARG;
1045         else if (mmc_can_trim(card))
1046                 arg = MMC_TRIM_ARG;
1047         else
1048                 arg = MMC_ERASE_ARG;
1049 retry:
1050         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1051                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1052                                  INAND_CMD38_ARG_EXT_CSD,
1053                                  arg == MMC_TRIM_ARG ?
1054                                  INAND_CMD38_ARG_TRIM :
1055                                  INAND_CMD38_ARG_ERASE,
1056                                  0);
1057                 if (err)
1058                         goto out;
1059         }
1060         err = mmc_erase(card, from, nr, arg);
1061 out:
1062         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1063                 goto retry;
1064         if (!err)
1065                 mmc_blk_reset_success(md, type);
1066         blk_end_request(req, err, blk_rq_bytes(req));
1067
1068         return err ? 0 : 1;
1069 }
1070
1071 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1072                                        struct request *req)
1073 {
1074         struct mmc_blk_data *md = mq->data;
1075         struct mmc_card *card = md->queue.card;
1076         unsigned int from, nr, arg;
1077         int err = 0, type = MMC_BLK_SECDISCARD;
1078
1079         if (!(mmc_can_secure_erase_trim(card))) {
1080                 err = -EOPNOTSUPP;
1081                 goto out;
1082         }
1083
1084         from = blk_rq_pos(req);
1085         nr = blk_rq_sectors(req);
1086
1087         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1088                 arg = MMC_SECURE_TRIM1_ARG;
1089         else
1090                 arg = MMC_SECURE_ERASE_ARG;
1091
1092 retry:
1093         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1094                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1095                                  INAND_CMD38_ARG_EXT_CSD,
1096                                  arg == MMC_SECURE_TRIM1_ARG ?
1097                                  INAND_CMD38_ARG_SECTRIM1 :
1098                                  INAND_CMD38_ARG_SECERASE,
1099                                  0);
1100                 if (err)
1101                         goto out_retry;
1102         }
1103
1104         err = mmc_erase(card, from, nr, arg);
1105         if (err == -EIO)
1106                 goto out_retry;
1107         if (err)
1108                 goto out;
1109
1110         if (arg == MMC_SECURE_TRIM1_ARG) {
1111                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1112                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1113                                          INAND_CMD38_ARG_EXT_CSD,
1114                                          INAND_CMD38_ARG_SECTRIM2,
1115                                          0);
1116                         if (err)
1117                                 goto out_retry;
1118                 }
1119
1120                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1121                 if (err == -EIO)
1122                         goto out_retry;
1123                 if (err)
1124                         goto out;
1125         }
1126
1127 out_retry:
1128         if (err && !mmc_blk_reset(md, card->host, type))
1129                 goto retry;
1130         if (!err)
1131                 mmc_blk_reset_success(md, type);
1132 out:
1133         blk_end_request(req, err, blk_rq_bytes(req));
1134
1135         return err ? 0 : 1;
1136 }
1137
1138 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1139 {
1140         struct mmc_blk_data *md = mq->data;
1141         struct mmc_card *card = md->queue.card;
1142         int ret = 0;
1143
1144         ret = mmc_flush_cache(card);
1145         if (ret)
1146                 ret = -EIO;
1147
1148         blk_end_request_all(req, ret);
1149
1150         return ret ? 0 : 1;
1151 }
1152
1153 /*
1154  * Reformat current write as a reliable write, supporting
1155  * both legacy and the enhanced reliable write MMC cards.
1156  * In each transfer we'll handle only as much as a single
1157  * reliable write can handle, thus finish the request in
1158  * partial completions.
1159  */
1160 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1161                                     struct mmc_card *card,
1162                                     struct request *req)
1163 {
1164         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1165                 /* Legacy mode imposes restrictions on transfers. */
1166                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1167                         brq->data.blocks = 1;
1168
1169                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1170                         brq->data.blocks = card->ext_csd.rel_sectors;
1171                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1172                         brq->data.blocks = 1;
1173         }
1174 }
1175
1176 #define CMD_ERRORS                                                      \
1177         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1178          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1179          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1180          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1181          R1_CC_ERROR |          /* Card controller error */             \
1182          R1_ERROR)              /* General/unknown error */
1183
1184 static int mmc_blk_err_check(struct mmc_card *card,
1185                              struct mmc_async_req *areq)
1186 {
1187         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1188                                                     mmc_active);
1189         struct mmc_blk_request *brq = &mq_mrq->brq;
1190         struct request *req = mq_mrq->req;
1191         int ecc_err = 0, gen_err = 0;
1192
1193         /*
1194          * sbc.error indicates a problem with the set block count
1195          * command.  No data will have been transferred.
1196          *
1197          * cmd.error indicates a problem with the r/w command.  No
1198          * data will have been transferred.
1199          *
1200          * stop.error indicates a problem with the stop command.  Data
1201          * may have been transferred, or may still be transferring.
1202          */
1203         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1204             brq->data.error) {
1205                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1206                 case ERR_RETRY:
1207                         return MMC_BLK_RETRY;
1208                 case ERR_ABORT:
1209                         return MMC_BLK_ABORT;
1210                 case ERR_NOMEDIUM:
1211                         return MMC_BLK_NOMEDIUM;
1212                 case ERR_CONTINUE:
1213                         break;
1214                 }
1215         }
1216
1217         /*
1218          * Check for errors relating to the execution of the
1219          * initial command - such as address errors.  No data
1220          * has been transferred.
1221          */
1222         if (brq->cmd.resp[0] & CMD_ERRORS) {
1223                 pr_err("%s: r/w command failed, status = %#x\n",
1224                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1225                 return MMC_BLK_ABORT;
1226         }
1227
1228         /*
1229          * Everything else is either success, or a data error of some
1230          * kind.  If it was a write, we may have transitioned to
1231          * program mode, which we have to wait for it to complete.
1232          */
1233         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1234                 int err;
1235
1236                 /* Check stop command response */
1237                 if (brq->stop.resp[0] & R1_ERROR) {
1238                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1239                                req->rq_disk->disk_name, __func__,
1240                                brq->stop.resp[0]);
1241                         gen_err = 1;
1242                 }
1243
1244                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1245                                         &gen_err);
1246                 if (err)
1247                         return MMC_BLK_CMD_ERR;
1248         }
1249
1250         /* if general error occurs, retry the write operation. */
1251         if (gen_err) {
1252                 pr_warn("%s: retrying write for general error\n",
1253                                 req->rq_disk->disk_name);
1254                 return MMC_BLK_RETRY;
1255         }
1256
1257         if (brq->data.error) {
1258                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1259                        req->rq_disk->disk_name, brq->data.error,
1260                        (unsigned)blk_rq_pos(req),
1261                        (unsigned)blk_rq_sectors(req),
1262                        brq->cmd.resp[0], brq->stop.resp[0]);
1263
1264                 if (rq_data_dir(req) == READ) {
1265                         if (ecc_err)
1266                                 return MMC_BLK_ECC_ERR;
1267                         return MMC_BLK_DATA_ERR;
1268                 } else {
1269                         return MMC_BLK_CMD_ERR;
1270                 }
1271         }
1272
1273         if (!brq->data.bytes_xfered)
1274                 return MMC_BLK_RETRY;
1275
1276         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1277                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1278                         return MMC_BLK_PARTIAL;
1279                 else
1280                         return MMC_BLK_SUCCESS;
1281         }
1282
1283         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1284                 return MMC_BLK_PARTIAL;
1285
1286         return MMC_BLK_SUCCESS;
1287 }
1288
1289 static int mmc_blk_packed_err_check(struct mmc_card *card,
1290                                     struct mmc_async_req *areq)
1291 {
1292         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1293                         mmc_active);
1294         struct request *req = mq_rq->req;
1295         struct mmc_packed *packed = mq_rq->packed;
1296         int err, check, status;
1297         u8 *ext_csd;
1298
1299         BUG_ON(!packed);
1300
1301         packed->retries--;
1302         check = mmc_blk_err_check(card, areq);
1303         err = get_card_status(card, &status, 0);
1304         if (err) {
1305                 pr_err("%s: error %d sending status command\n",
1306                        req->rq_disk->disk_name, err);
1307                 return MMC_BLK_ABORT;
1308         }
1309
1310         if (status & R1_EXCEPTION_EVENT) {
1311                 ext_csd = kzalloc(512, GFP_KERNEL);
1312                 if (!ext_csd) {
1313                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1314                                req->rq_disk->disk_name);
1315                         return -ENOMEM;
1316                 }
1317
1318                 err = mmc_send_ext_csd(card, ext_csd);
1319                 if (err) {
1320                         pr_err("%s: error %d sending ext_csd\n",
1321                                req->rq_disk->disk_name, err);
1322                         check = MMC_BLK_ABORT;
1323                         goto free;
1324                 }
1325
1326                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1327                      EXT_CSD_PACKED_FAILURE) &&
1328                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1329                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1330                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1331                             EXT_CSD_PACKED_INDEXED_ERROR) {
1332                                 packed->idx_failure =
1333                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1334                                 check = MMC_BLK_PARTIAL;
1335                         }
1336                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1337                                "failure index: %d\n",
1338                                req->rq_disk->disk_name, packed->nr_entries,
1339                                packed->blocks, packed->idx_failure);
1340                 }
1341 free:
1342                 kfree(ext_csd);
1343         }
1344
1345         return check;
1346 }
1347
1348 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1349                                struct mmc_card *card,
1350                                int disable_multi,
1351                                struct mmc_queue *mq)
1352 {
1353         u32 readcmd, writecmd;
1354         struct mmc_blk_request *brq = &mqrq->brq;
1355         struct request *req = mqrq->req;
1356         struct mmc_blk_data *md = mq->data;
1357         bool do_data_tag;
1358
1359         /*
1360          * Reliable writes are used to implement Forced Unit Access and
1361          * REQ_META accesses, and are supported only on MMCs.
1362          *
1363          * XXX: this really needs a good explanation of why REQ_META
1364          * is treated special.
1365          */
1366         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1367                           (req->cmd_flags & REQ_META)) &&
1368                 (rq_data_dir(req) == WRITE) &&
1369                 (md->flags & MMC_BLK_REL_WR);
1370
1371         memset(brq, 0, sizeof(struct mmc_blk_request));
1372         brq->mrq.cmd = &brq->cmd;
1373         brq->mrq.data = &brq->data;
1374
1375         brq->cmd.arg = blk_rq_pos(req);
1376         if (!mmc_card_blockaddr(card))
1377                 brq->cmd.arg <<= 9;
1378         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1379         brq->data.blksz = 512;
1380         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1381         brq->stop.arg = 0;
1382         brq->data.blocks = blk_rq_sectors(req);
1383
1384         /*
1385          * The block layer doesn't support all sector count
1386          * restrictions, so we need to be prepared for too big
1387          * requests.
1388          */
1389         if (brq->data.blocks > card->host->max_blk_count)
1390                 brq->data.blocks = card->host->max_blk_count;
1391
1392         if (brq->data.blocks > 1) {
1393                 /*
1394                  * After a read error, we redo the request one sector
1395                  * at a time in order to accurately determine which
1396                  * sectors can be read successfully.
1397                  */
1398                 if (disable_multi)
1399                         brq->data.blocks = 1;
1400
1401                 /*
1402                  * Some controllers have HW issues while operating
1403                  * in multiple I/O mode
1404                  */
1405                 if (card->host->ops->multi_io_quirk)
1406                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1407                                                 (rq_data_dir(req) == READ) ?
1408                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1409                                                 brq->data.blocks);
1410         }
1411
1412         if (brq->data.blocks > 1 || do_rel_wr) {
1413                 /* SPI multiblock writes terminate using a special
1414                  * token, not a STOP_TRANSMISSION request.
1415                  */
1416                 if (!mmc_host_is_spi(card->host) ||
1417                     rq_data_dir(req) == READ)
1418                         brq->mrq.stop = &brq->stop;
1419                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1420                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1421         } else {
1422                 brq->mrq.stop = NULL;
1423                 readcmd = MMC_READ_SINGLE_BLOCK;
1424                 writecmd = MMC_WRITE_BLOCK;
1425         }
1426         if (rq_data_dir(req) == READ) {
1427                 brq->cmd.opcode = readcmd;
1428                 brq->data.flags |= MMC_DATA_READ;
1429                 if (brq->mrq.stop)
1430                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1431                                         MMC_CMD_AC;
1432         } else {
1433                 brq->cmd.opcode = writecmd;
1434                 brq->data.flags |= MMC_DATA_WRITE;
1435                 if (brq->mrq.stop)
1436                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1437                                         MMC_CMD_AC;
1438         }
1439
1440         if (do_rel_wr)
1441                 mmc_apply_rel_rw(brq, card, req);
1442
1443         /*
1444          * Data tag is used only during writing meta data to speed
1445          * up write and any subsequent read of this meta data
1446          */
1447         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1448                 (req->cmd_flags & REQ_META) &&
1449                 (rq_data_dir(req) == WRITE) &&
1450                 ((brq->data.blocks * brq->data.blksz) >=
1451                  card->ext_csd.data_tag_unit_size);
1452
1453         /*
1454          * Pre-defined multi-block transfers are preferable to
1455          * open ended-ones (and necessary for reliable writes).
1456          * However, it is not sufficient to just send CMD23,
1457          * and avoid the final CMD12, as on an error condition
1458          * CMD12 (stop) needs to be sent anyway. This, coupled
1459          * with Auto-CMD23 enhancements provided by some
1460          * hosts, means that the complexity of dealing
1461          * with this is best left to the host. If CMD23 is
1462          * supported by card and host, we'll fill sbc in and let
1463          * the host deal with handling it correctly. This means
1464          * that for hosts that don't expose MMC_CAP_CMD23, no
1465          * change of behavior will be observed.
1466          *
1467          * N.B: Some MMC cards experience perf degradation.
1468          * We'll avoid using CMD23-bounded multiblock writes for
1469          * these, while retaining features like reliable writes.
1470          */
1471         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1472             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1473              do_data_tag)) {
1474                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1475                 brq->sbc.arg = brq->data.blocks |
1476                         (do_rel_wr ? (1 << 31) : 0) |
1477                         (do_data_tag ? (1 << 29) : 0);
1478                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1479                 brq->mrq.sbc = &brq->sbc;
1480         }
1481
1482         mmc_set_data_timeout(&brq->data, card);
1483
1484         brq->data.sg = mqrq->sg;
1485         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1486
1487         /*
1488          * Adjust the sg list so it is the same size as the
1489          * request.
1490          */
1491         if (brq->data.blocks != blk_rq_sectors(req)) {
1492                 int i, data_size = brq->data.blocks << 9;
1493                 struct scatterlist *sg;
1494
1495                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1496                         data_size -= sg->length;
1497                         if (data_size <= 0) {
1498                                 sg->length += data_size;
1499                                 i++;
1500                                 break;
1501                         }
1502                 }
1503                 brq->data.sg_len = i;
1504         }
1505
1506         mqrq->mmc_active.mrq = &brq->mrq;
1507         mqrq->mmc_active.err_check = mmc_blk_err_check;
1508
1509         mmc_queue_bounce_pre(mqrq);
1510 }
1511
1512 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1513                                           struct mmc_card *card)
1514 {
1515         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1516         unsigned int max_seg_sz = queue_max_segment_size(q);
1517         unsigned int len, nr_segs = 0;
1518
1519         do {
1520                 len = min(hdr_sz, max_seg_sz);
1521                 hdr_sz -= len;
1522                 nr_segs++;
1523         } while (hdr_sz);
1524
1525         return nr_segs;
1526 }
1527
1528 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1529 {
1530         struct request_queue *q = mq->queue;
1531         struct mmc_card *card = mq->card;
1532         struct request *cur = req, *next = NULL;
1533         struct mmc_blk_data *md = mq->data;
1534         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1535         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1536         unsigned int req_sectors = 0, phys_segments = 0;
1537         unsigned int max_blk_count, max_phys_segs;
1538         bool put_back = true;
1539         u8 max_packed_rw = 0;
1540         u8 reqs = 0;
1541
1542         if (!(md->flags & MMC_BLK_PACKED_CMD))
1543                 goto no_packed;
1544
1545         if ((rq_data_dir(cur) == WRITE) &&
1546             mmc_host_packed_wr(card->host))
1547                 max_packed_rw = card->ext_csd.max_packed_writes;
1548
1549         if (max_packed_rw == 0)
1550                 goto no_packed;
1551
1552         if (mmc_req_rel_wr(cur) &&
1553             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1554                 goto no_packed;
1555
1556         if (mmc_large_sector(card) &&
1557             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1558                 goto no_packed;
1559
1560         mmc_blk_clear_packed(mqrq);
1561
1562         max_blk_count = min(card->host->max_blk_count,
1563                             card->host->max_req_size >> 9);
1564         if (unlikely(max_blk_count > 0xffff))
1565                 max_blk_count = 0xffff;
1566
1567         max_phys_segs = queue_max_segments(q);
1568         req_sectors += blk_rq_sectors(cur);
1569         phys_segments += cur->nr_phys_segments;
1570
1571         if (rq_data_dir(cur) == WRITE) {
1572                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1573                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1574         }
1575
1576         do {
1577                 if (reqs >= max_packed_rw - 1) {
1578                         put_back = false;
1579                         break;
1580                 }
1581
1582                 spin_lock_irq(q->queue_lock);
1583                 next = blk_fetch_request(q);
1584                 spin_unlock_irq(q->queue_lock);
1585                 if (!next) {
1586                         put_back = false;
1587                         break;
1588                 }
1589
1590                 if (mmc_large_sector(card) &&
1591                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1592                         break;
1593
1594                 if (next->cmd_flags & REQ_DISCARD ||
1595                     next->cmd_flags & REQ_FLUSH)
1596                         break;
1597
1598                 if (rq_data_dir(cur) != rq_data_dir(next))
1599                         break;
1600
1601                 if (mmc_req_rel_wr(next) &&
1602                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1603                         break;
1604
1605                 req_sectors += blk_rq_sectors(next);
1606                 if (req_sectors > max_blk_count)
1607                         break;
1608
1609                 phys_segments +=  next->nr_phys_segments;
1610                 if (phys_segments > max_phys_segs)
1611                         break;
1612
1613                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1614                 cur = next;
1615                 reqs++;
1616         } while (1);
1617
1618         if (put_back) {
1619                 spin_lock_irq(q->queue_lock);
1620                 blk_requeue_request(q, next);
1621                 spin_unlock_irq(q->queue_lock);
1622         }
1623
1624         if (reqs > 0) {
1625                 list_add(&req->queuelist, &mqrq->packed->list);
1626                 mqrq->packed->nr_entries = ++reqs;
1627                 mqrq->packed->retries = reqs;
1628                 return reqs;
1629         }
1630
1631 no_packed:
1632         mqrq->cmd_type = MMC_PACKED_NONE;
1633         return 0;
1634 }
1635
1636 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1637                                         struct mmc_card *card,
1638                                         struct mmc_queue *mq)
1639 {
1640         struct mmc_blk_request *brq = &mqrq->brq;
1641         struct request *req = mqrq->req;
1642         struct request *prq;
1643         struct mmc_blk_data *md = mq->data;
1644         struct mmc_packed *packed = mqrq->packed;
1645         bool do_rel_wr, do_data_tag;
1646         u32 *packed_cmd_hdr;
1647         u8 hdr_blocks;
1648         u8 i = 1;
1649
1650         BUG_ON(!packed);
1651
1652         mqrq->cmd_type = MMC_PACKED_WRITE;
1653         packed->blocks = 0;
1654         packed->idx_failure = MMC_PACKED_NR_IDX;
1655
1656         packed_cmd_hdr = packed->cmd_hdr;
1657         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1658         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1659                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1660         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1661
1662         /*
1663          * Argument for each entry of packed group
1664          */
1665         list_for_each_entry(prq, &packed->list, queuelist) {
1666                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1667                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1668                         (prq->cmd_flags & REQ_META) &&
1669                         (rq_data_dir(prq) == WRITE) &&
1670                         ((brq->data.blocks * brq->data.blksz) >=
1671                          card->ext_csd.data_tag_unit_size);
1672                 /* Argument of CMD23 */
1673                 packed_cmd_hdr[(i * 2)] =
1674                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1675                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1676                         blk_rq_sectors(prq);
1677                 /* Argument of CMD18 or CMD25 */
1678                 packed_cmd_hdr[((i * 2)) + 1] =
1679                         mmc_card_blockaddr(card) ?
1680                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1681                 packed->blocks += blk_rq_sectors(prq);
1682                 i++;
1683         }
1684
1685         memset(brq, 0, sizeof(struct mmc_blk_request));
1686         brq->mrq.cmd = &brq->cmd;
1687         brq->mrq.data = &brq->data;
1688         brq->mrq.sbc = &brq->sbc;
1689         brq->mrq.stop = &brq->stop;
1690
1691         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1692         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1693         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1694
1695         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1696         brq->cmd.arg = blk_rq_pos(req);
1697         if (!mmc_card_blockaddr(card))
1698                 brq->cmd.arg <<= 9;
1699         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1700
1701         brq->data.blksz = 512;
1702         brq->data.blocks = packed->blocks + hdr_blocks;
1703         brq->data.flags |= MMC_DATA_WRITE;
1704
1705         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1706         brq->stop.arg = 0;
1707         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1708
1709         mmc_set_data_timeout(&brq->data, card);
1710
1711         brq->data.sg = mqrq->sg;
1712         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1713
1714         mqrq->mmc_active.mrq = &brq->mrq;
1715         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1716
1717         mmc_queue_bounce_pre(mqrq);
1718 }
1719
1720 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1721                            struct mmc_blk_request *brq, struct request *req,
1722                            int ret)
1723 {
1724         struct mmc_queue_req *mq_rq;
1725         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1726
1727         /*
1728          * If this is an SD card and we're writing, we can first
1729          * mark the known good sectors as ok.
1730          *
1731          * If the card is not SD, we can still ok written sectors
1732          * as reported by the controller (which might be less than
1733          * the real number of written sectors, but never more).
1734          */
1735         if (mmc_card_sd(card)) {
1736                 u32 blocks;
1737
1738                 blocks = mmc_sd_num_wr_blocks(card);
1739                 if (blocks != (u32)-1) {
1740                         ret = blk_end_request(req, 0, blocks << 9);
1741                 }
1742         } else {
1743                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1744                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1745         }
1746         return ret;
1747 }
1748
1749 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1750 {
1751         struct request *prq;
1752         struct mmc_packed *packed = mq_rq->packed;
1753         int idx = packed->idx_failure, i = 0;
1754         int ret = 0;
1755
1756         BUG_ON(!packed);
1757
1758         while (!list_empty(&packed->list)) {
1759                 prq = list_entry_rq(packed->list.next);
1760                 if (idx == i) {
1761                         /* retry from error index */
1762                         packed->nr_entries -= idx;
1763                         mq_rq->req = prq;
1764                         ret = 1;
1765
1766                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1767                                 list_del_init(&prq->queuelist);
1768                                 mmc_blk_clear_packed(mq_rq);
1769                         }
1770                         return ret;
1771                 }
1772                 list_del_init(&prq->queuelist);
1773                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1774                 i++;
1775         }
1776
1777         mmc_blk_clear_packed(mq_rq);
1778         return ret;
1779 }
1780
1781 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1782 {
1783         struct request *prq;
1784         struct mmc_packed *packed = mq_rq->packed;
1785
1786         BUG_ON(!packed);
1787
1788         while (!list_empty(&packed->list)) {
1789                 prq = list_entry_rq(packed->list.next);
1790                 list_del_init(&prq->queuelist);
1791                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1792         }
1793
1794         mmc_blk_clear_packed(mq_rq);
1795 }
1796
1797 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1798                                       struct mmc_queue_req *mq_rq)
1799 {
1800         struct request *prq;
1801         struct request_queue *q = mq->queue;
1802         struct mmc_packed *packed = mq_rq->packed;
1803
1804         BUG_ON(!packed);
1805
1806         while (!list_empty(&packed->list)) {
1807                 prq = list_entry_rq(packed->list.prev);
1808                 if (prq->queuelist.prev != &packed->list) {
1809                         list_del_init(&prq->queuelist);
1810                         spin_lock_irq(q->queue_lock);
1811                         blk_requeue_request(mq->queue, prq);
1812                         spin_unlock_irq(q->queue_lock);
1813                 } else {
1814                         list_del_init(&prq->queuelist);
1815                 }
1816         }
1817
1818         mmc_blk_clear_packed(mq_rq);
1819 }
1820
1821 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1822 {
1823         struct mmc_blk_data *md = mq->data;
1824         struct mmc_card *card = md->queue.card;
1825         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1826         int ret = 1, disable_multi = 0, retry = 0, type;
1827         enum mmc_blk_status status;
1828         struct mmc_queue_req *mq_rq;
1829         struct request *req = rqc;
1830         struct mmc_async_req *areq;
1831         const u8 packed_nr = 2;
1832         u8 reqs = 0;
1833
1834         if (!rqc && !mq->mqrq_prev->req)
1835                 return 0;
1836
1837         if (rqc)
1838                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1839
1840         do {
1841                 if (rqc) {
1842                         /*
1843                          * When 4KB native sector is enabled, only 8 blocks
1844                          * multiple read or write is allowed
1845                          */
1846                         if ((brq->data.blocks & 0x07) &&
1847                             (card->ext_csd.data_sector_size == 4096)) {
1848                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1849                                         req->rq_disk->disk_name);
1850                                 mq_rq = mq->mqrq_cur;
1851                                 goto cmd_abort;
1852                         }
1853
1854                         if (reqs >= packed_nr)
1855                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1856                                                             card, mq);
1857                         else
1858                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1859                         areq = &mq->mqrq_cur->mmc_active;
1860                 } else
1861                         areq = NULL;
1862                 areq = mmc_start_req(card->host, areq, (int *) &status);
1863                 if (!areq) {
1864                         if (status == MMC_BLK_NEW_REQUEST)
1865                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1866                         return 0;
1867                 }
1868
1869                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1870                 brq = &mq_rq->brq;
1871                 req = mq_rq->req;
1872                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1873                 mmc_queue_bounce_post(mq_rq);
1874
1875                 switch (status) {
1876                 case MMC_BLK_SUCCESS:
1877                 case MMC_BLK_PARTIAL:
1878                         /*
1879                          * A block was successfully transferred.
1880                          */
1881                         mmc_blk_reset_success(md, type);
1882
1883                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1884                                 ret = mmc_blk_end_packed_req(mq_rq);
1885                                 break;
1886                         } else {
1887                                 ret = blk_end_request(req, 0,
1888                                                 brq->data.bytes_xfered);
1889                         }
1890
1891                         /*
1892                          * If the blk_end_request function returns non-zero even
1893                          * though all data has been transferred and no errors
1894                          * were returned by the host controller, it's a bug.
1895                          */
1896                         if (status == MMC_BLK_SUCCESS && ret) {
1897                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1898                                        __func__, blk_rq_bytes(req),
1899                                        brq->data.bytes_xfered);
1900                                 rqc = NULL;
1901                                 goto cmd_abort;
1902                         }
1903                         break;
1904                 case MMC_BLK_CMD_ERR:
1905                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1906                         if (!mmc_blk_reset(md, card->host, type))
1907                                 break;
1908                         goto cmd_abort;
1909                 case MMC_BLK_RETRY:
1910                         if (retry++ < 5)
1911                                 break;
1912                         /* Fall through */
1913                 case MMC_BLK_ABORT:
1914                         if (!mmc_blk_reset(md, card->host, type))
1915                                 break;
1916                         goto cmd_abort;
1917                 case MMC_BLK_DATA_ERR: {
1918                         int err;
1919
1920                         err = mmc_blk_reset(md, card->host, type);
1921                         if (!err)
1922                                 break;
1923                         if (err == -ENODEV ||
1924                                 mmc_packed_cmd(mq_rq->cmd_type))
1925                                 goto cmd_abort;
1926                         /* Fall through */
1927                 }
1928                 case MMC_BLK_ECC_ERR:
1929                         if (brq->data.blocks > 1) {
1930                                 /* Redo read one sector at a time */
1931                                 pr_warn("%s: retrying using single block read\n",
1932                                         req->rq_disk->disk_name);
1933                                 disable_multi = 1;
1934                                 break;
1935                         }
1936                         /*
1937                          * After an error, we redo I/O one sector at a
1938                          * time, so we only reach here after trying to
1939                          * read a single sector.
1940                          */
1941                         ret = blk_end_request(req, -EIO,
1942                                                 brq->data.blksz);
1943                         if (!ret)
1944                                 goto start_new_req;
1945                         break;
1946                 case MMC_BLK_NOMEDIUM:
1947                         goto cmd_abort;
1948                 default:
1949                         pr_err("%s: Unhandled return value (%d)",
1950                                         req->rq_disk->disk_name, status);
1951                         goto cmd_abort;
1952                 }
1953
1954                 if (ret) {
1955                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1956                                 if (!mq_rq->packed->retries)
1957                                         goto cmd_abort;
1958                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1959                                 mmc_start_req(card->host,
1960                                               &mq_rq->mmc_active, NULL);
1961                         } else {
1962
1963                                 /*
1964                                  * In case of a incomplete request
1965                                  * prepare it again and resend.
1966                                  */
1967                                 mmc_blk_rw_rq_prep(mq_rq, card,
1968                                                 disable_multi, mq);
1969                                 mmc_start_req(card->host,
1970                                                 &mq_rq->mmc_active, NULL);
1971                         }
1972                 }
1973         } while (ret);
1974
1975         return 1;
1976
1977  cmd_abort:
1978         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1979                 mmc_blk_abort_packed_req(mq_rq);
1980         } else {
1981                 if (mmc_card_removed(card))
1982                         req->cmd_flags |= REQ_QUIET;
1983                 while (ret)
1984                         ret = blk_end_request(req, -EIO,
1985                                         blk_rq_cur_bytes(req));
1986         }
1987
1988  start_new_req:
1989         if (rqc) {
1990                 if (mmc_card_removed(card)) {
1991                         rqc->cmd_flags |= REQ_QUIET;
1992                         blk_end_request_all(rqc, -EIO);
1993                 } else {
1994                         /*
1995                          * If current request is packed, it needs to put back.
1996                          */
1997                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1998                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1999
2000                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2001                         mmc_start_req(card->host,
2002                                       &mq->mqrq_cur->mmc_active, NULL);
2003                 }
2004         }
2005
2006         return 0;
2007 }
2008
2009 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2010 {
2011         int ret;
2012         struct mmc_blk_data *md = mq->data;
2013         struct mmc_card *card = md->queue.card;
2014         struct mmc_host *host = card->host;
2015         unsigned long flags;
2016         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2017
2018         if (req && !mq->mqrq_prev->req)
2019                 /* claim host only for the first request */
2020                 mmc_get_card(card);
2021
2022         ret = mmc_blk_part_switch(card, md);
2023         if (ret) {
2024                 if (req) {
2025                         blk_end_request_all(req, -EIO);
2026                 }
2027                 ret = 0;
2028                 goto out;
2029         }
2030
2031         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2032         if (cmd_flags & REQ_DISCARD) {
2033                 /* complete ongoing async transfer before issuing discard */
2034                 if (card->host->areq)
2035                         mmc_blk_issue_rw_rq(mq, NULL);
2036                 if (req->cmd_flags & REQ_SECURE)
2037                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2038                 else
2039                         ret = mmc_blk_issue_discard_rq(mq, req);
2040         } else if (cmd_flags & REQ_FLUSH) {
2041                 /* complete ongoing async transfer before issuing flush */
2042                 if (card->host->areq)
2043                         mmc_blk_issue_rw_rq(mq, NULL);
2044                 ret = mmc_blk_issue_flush(mq, req);
2045         } else {
2046                 if (!req && host->areq) {
2047                         spin_lock_irqsave(&host->context_info.lock, flags);
2048                         host->context_info.is_waiting_last_req = true;
2049                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2050                 }
2051                 ret = mmc_blk_issue_rw_rq(mq, req);
2052         }
2053
2054 out:
2055         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2056              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2057                 /*
2058                  * Release host when there are no more requests
2059                  * and after special request(discard, flush) is done.
2060                  * In case sepecial request, there is no reentry to
2061                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2062                  */
2063                 mmc_put_card(card);
2064         return ret;
2065 }
2066
2067 static inline int mmc_blk_readonly(struct mmc_card *card)
2068 {
2069         return mmc_card_readonly(card) ||
2070                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2071 }
2072
2073 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2074                                               struct device *parent,
2075                                               sector_t size,
2076                                               bool default_ro,
2077                                               const char *subname,
2078                                               int area_type)
2079 {
2080         struct mmc_blk_data *md;
2081         int devidx, ret;
2082
2083         devidx = find_first_zero_bit(dev_use, max_devices);
2084         if (devidx >= max_devices)
2085                 return ERR_PTR(-ENOSPC);
2086         __set_bit(devidx, dev_use);
2087
2088         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2089         if (!md) {
2090                 ret = -ENOMEM;
2091                 goto out;
2092         }
2093
2094         /*
2095          * !subname implies we are creating main mmc_blk_data that will be
2096          * associated with mmc_card with mmc_set_drvdata. Due to device
2097          * partitions, devidx will not coincide with a per-physical card
2098          * index anymore so we keep track of a name index.
2099          */
2100         if (!subname) {
2101                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2102                 __set_bit(md->name_idx, name_use);
2103         } else
2104                 md->name_idx = ((struct mmc_blk_data *)
2105                                 dev_to_disk(parent)->private_data)->name_idx;
2106
2107         md->area_type = area_type;
2108
2109         /*
2110          * Set the read-only status based on the supported commands
2111          * and the write protect switch.
2112          */
2113         md->read_only = mmc_blk_readonly(card);
2114
2115         md->disk = alloc_disk(perdev_minors);
2116         if (md->disk == NULL) {
2117                 ret = -ENOMEM;
2118                 goto err_kfree;
2119         }
2120
2121         spin_lock_init(&md->lock);
2122         INIT_LIST_HEAD(&md->part);
2123         md->usage = 1;
2124
2125         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2126         if (ret)
2127                 goto err_putdisk;
2128
2129         md->queue.issue_fn = mmc_blk_issue_rq;
2130         md->queue.data = md;
2131
2132         md->disk->major = MMC_BLOCK_MAJOR;
2133         md->disk->first_minor = devidx * perdev_minors;
2134         md->disk->fops = &mmc_bdops;
2135         md->disk->private_data = md;
2136         md->disk->queue = md->queue.queue;
2137         md->disk->driverfs_dev = parent;
2138         set_disk_ro(md->disk, md->read_only || default_ro);
2139         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2140                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2141
2142         /*
2143          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2144          *
2145          * - be set for removable media with permanent block devices
2146          * - be unset for removable block devices with permanent media
2147          *
2148          * Since MMC block devices clearly fall under the second
2149          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2150          * should use the block device creation/destruction hotplug
2151          * messages to tell when the card is present.
2152          */
2153
2154         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2155                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2156
2157         if (mmc_card_mmc(card))
2158                 blk_queue_logical_block_size(md->queue.queue,
2159                                              card->ext_csd.data_sector_size);
2160         else
2161                 blk_queue_logical_block_size(md->queue.queue, 512);
2162
2163         set_capacity(md->disk, size);
2164
2165         if (mmc_host_cmd23(card->host)) {
2166                 if (mmc_card_mmc(card) ||
2167                     (mmc_card_sd(card) &&
2168                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2169                         md->flags |= MMC_BLK_CMD23;
2170         }
2171
2172         if (mmc_card_mmc(card) &&
2173             md->flags & MMC_BLK_CMD23 &&
2174             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2175              card->ext_csd.rel_sectors)) {
2176                 md->flags |= MMC_BLK_REL_WR;
2177                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2178         }
2179
2180         if (mmc_card_mmc(card) &&
2181             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2182             (md->flags & MMC_BLK_CMD23) &&
2183             card->ext_csd.packed_event_en) {
2184                 if (!mmc_packed_init(&md->queue, card))
2185                         md->flags |= MMC_BLK_PACKED_CMD;
2186         }
2187
2188         return md;
2189
2190  err_putdisk:
2191         put_disk(md->disk);
2192  err_kfree:
2193         kfree(md);
2194  out:
2195         return ERR_PTR(ret);
2196 }
2197
2198 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2199 {
2200         sector_t size;
2201         struct mmc_blk_data *md;
2202
2203         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2204                 /*
2205                  * The EXT_CSD sector count is in number or 512 byte
2206                  * sectors.
2207                  */
2208                 size = card->ext_csd.sectors;
2209         } else {
2210                 /*
2211                  * The CSD capacity field is in units of read_blkbits.
2212                  * set_capacity takes units of 512 bytes.
2213                  */
2214                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2215         }
2216
2217         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2218                                         MMC_BLK_DATA_AREA_MAIN);
2219         return md;
2220 }
2221
2222 static int mmc_blk_alloc_part(struct mmc_card *card,
2223                               struct mmc_blk_data *md,
2224                               unsigned int part_type,
2225                               sector_t size,
2226                               bool default_ro,
2227                               const char *subname,
2228                               int area_type)
2229 {
2230         char cap_str[10];
2231         struct mmc_blk_data *part_md;
2232
2233         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2234                                     subname, area_type);
2235         if (IS_ERR(part_md))
2236                 return PTR_ERR(part_md);
2237         part_md->part_type = part_type;
2238         list_add(&part_md->part, &md->part);
2239
2240         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2241                         cap_str, sizeof(cap_str));
2242         pr_info("%s: %s %s partition %u %s\n",
2243                part_md->disk->disk_name, mmc_card_id(card),
2244                mmc_card_name(card), part_md->part_type, cap_str);
2245         return 0;
2246 }
2247
2248 /* MMC Physical partitions consist of two boot partitions and
2249  * up to four general purpose partitions.
2250  * For each partition enabled in EXT_CSD a block device will be allocatedi
2251  * to provide access to the partition.
2252  */
2253
2254 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2255 {
2256         int idx, ret = 0;
2257
2258         if (!mmc_card_mmc(card))
2259                 return 0;
2260
2261         for (idx = 0; idx < card->nr_parts; idx++) {
2262                 if (card->part[idx].size) {
2263                         ret = mmc_blk_alloc_part(card, md,
2264                                 card->part[idx].part_cfg,
2265                                 card->part[idx].size >> 9,
2266                                 card->part[idx].force_ro,
2267                                 card->part[idx].name,
2268                                 card->part[idx].area_type);
2269                         if (ret)
2270                                 return ret;
2271                 }
2272         }
2273
2274         return ret;
2275 }
2276
2277 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2278 {
2279         struct mmc_card *card;
2280
2281         if (md) {
2282                 /*
2283                  * Flush remaining requests and free queues. It
2284                  * is freeing the queue that stops new requests
2285                  * from being accepted.
2286                  */
2287                 card = md->queue.card;
2288                 mmc_cleanup_queue(&md->queue);
2289                 if (md->flags & MMC_BLK_PACKED_CMD)
2290                         mmc_packed_clean(&md->queue);
2291                 if (md->disk->flags & GENHD_FL_UP) {
2292                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2293                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2294                                         card->ext_csd.boot_ro_lockable)
2295                                 device_remove_file(disk_to_dev(md->disk),
2296                                         &md->power_ro_lock);
2297
2298                         del_gendisk(md->disk);
2299                 }
2300                 mmc_blk_put(md);
2301         }
2302 }
2303
2304 static void mmc_blk_remove_parts(struct mmc_card *card,
2305                                  struct mmc_blk_data *md)
2306 {
2307         struct list_head *pos, *q;
2308         struct mmc_blk_data *part_md;
2309
2310         __clear_bit(md->name_idx, name_use);
2311         list_for_each_safe(pos, q, &md->part) {
2312                 part_md = list_entry(pos, struct mmc_blk_data, part);
2313                 list_del(pos);
2314                 mmc_blk_remove_req(part_md);
2315         }
2316 }
2317
2318 static int mmc_add_disk(struct mmc_blk_data *md)
2319 {
2320         int ret;
2321         struct mmc_card *card = md->queue.card;
2322
2323         add_disk(md->disk);
2324         md->force_ro.show = force_ro_show;
2325         md->force_ro.store = force_ro_store;
2326         sysfs_attr_init(&md->force_ro.attr);
2327         md->force_ro.attr.name = "force_ro";
2328         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2329         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2330         if (ret)
2331                 goto force_ro_fail;
2332
2333         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2334              card->ext_csd.boot_ro_lockable) {
2335                 umode_t mode;
2336
2337                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2338                         mode = S_IRUGO;
2339                 else
2340                         mode = S_IRUGO | S_IWUSR;
2341
2342                 md->power_ro_lock.show = power_ro_lock_show;
2343                 md->power_ro_lock.store = power_ro_lock_store;
2344                 sysfs_attr_init(&md->power_ro_lock.attr);
2345                 md->power_ro_lock.attr.mode = mode;
2346                 md->power_ro_lock.attr.name =
2347                                         "ro_lock_until_next_power_on";
2348                 ret = device_create_file(disk_to_dev(md->disk),
2349                                 &md->power_ro_lock);
2350                 if (ret)
2351                         goto power_ro_lock_fail;
2352         }
2353         return ret;
2354
2355 power_ro_lock_fail:
2356         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2357 force_ro_fail:
2358         del_gendisk(md->disk);
2359
2360         return ret;
2361 }
2362
2363 #define CID_MANFID_SANDISK      0x2
2364 #define CID_MANFID_TOSHIBA      0x11
2365 #define CID_MANFID_MICRON       0x13
2366 #define CID_MANFID_SAMSUNG      0x15
2367
2368 static const struct mmc_fixup blk_fixups[] =
2369 {
2370         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2371                   MMC_QUIRK_INAND_CMD38),
2372         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2373                   MMC_QUIRK_INAND_CMD38),
2374         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2375                   MMC_QUIRK_INAND_CMD38),
2376         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2377                   MMC_QUIRK_INAND_CMD38),
2378         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2379                   MMC_QUIRK_INAND_CMD38),
2380
2381         /*
2382          * Some MMC cards experience performance degradation with CMD23
2383          * instead of CMD12-bounded multiblock transfers. For now we'll
2384          * black list what's bad...
2385          * - Certain Toshiba cards.
2386          *
2387          * N.B. This doesn't affect SD cards.
2388          */
2389         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2390                   MMC_QUIRK_BLK_NO_CMD23),
2391         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2392                   MMC_QUIRK_BLK_NO_CMD23),
2393         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2394                   MMC_QUIRK_BLK_NO_CMD23),
2395
2396         /*
2397          * Some Micron MMC cards needs longer data read timeout than
2398          * indicated in CSD.
2399          */
2400         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2401                   MMC_QUIRK_LONG_READ_TIME),
2402
2403         /*
2404          * On these Samsung MoviNAND parts, performing secure erase or
2405          * secure trim can result in unrecoverable corruption due to a
2406          * firmware bug.
2407          */
2408         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2409                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2410         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2411                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2412         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2413                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2414         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2415                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2416         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2417                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2418         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2419                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2420         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2421                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2422         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2423                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2424
2425         END_FIXUP
2426 };
2427
2428 static int mmc_blk_probe(struct mmc_card *card)
2429 {
2430         struct mmc_blk_data *md, *part_md;
2431         char cap_str[10];
2432
2433         /*
2434          * Check that the card supports the command class(es) we need.
2435          */
2436         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2437                 return -ENODEV;
2438
2439         mmc_fixup_device(card, blk_fixups);
2440
2441         md = mmc_blk_alloc(card);
2442         if (IS_ERR(md))
2443                 return PTR_ERR(md);
2444
2445         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2446                         cap_str, sizeof(cap_str));
2447         pr_info("%s: %s %s %s %s\n",
2448                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2449                 cap_str, md->read_only ? "(ro)" : "");
2450
2451         if (mmc_blk_alloc_parts(card, md))
2452                 goto out;
2453
2454         mmc_set_drvdata(card, md);
2455
2456         if (mmc_add_disk(md))
2457                 goto out;
2458
2459         list_for_each_entry(part_md, &md->part, part) {
2460                 if (mmc_add_disk(part_md))
2461                         goto out;
2462         }
2463
2464         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2465         pm_runtime_use_autosuspend(&card->dev);
2466
2467         /*
2468          * Don't enable runtime PM for SD-combo cards here. Leave that
2469          * decision to be taken during the SDIO init sequence instead.
2470          */
2471         if (card->type != MMC_TYPE_SD_COMBO) {
2472                 pm_runtime_set_active(&card->dev);
2473                 pm_runtime_enable(&card->dev);
2474         }
2475
2476         return 0;
2477
2478  out:
2479         mmc_blk_remove_parts(card, md);
2480         mmc_blk_remove_req(md);
2481         return 0;
2482 }
2483
2484 static void mmc_blk_remove(struct mmc_card *card)
2485 {
2486         struct mmc_blk_data *md = mmc_get_drvdata(card);
2487
2488         mmc_blk_remove_parts(card, md);
2489         pm_runtime_get_sync(&card->dev);
2490         mmc_claim_host(card->host);
2491         mmc_blk_part_switch(card, md);
2492         mmc_release_host(card->host);
2493         if (card->type != MMC_TYPE_SD_COMBO)
2494                 pm_runtime_disable(&card->dev);
2495         pm_runtime_put_noidle(&card->dev);
2496         mmc_blk_remove_req(md);
2497         mmc_set_drvdata(card, NULL);
2498 }
2499
2500 static int _mmc_blk_suspend(struct mmc_card *card)
2501 {
2502         struct mmc_blk_data *part_md;
2503         struct mmc_blk_data *md = mmc_get_drvdata(card);
2504
2505         if (md) {
2506                 mmc_queue_suspend(&md->queue);
2507                 list_for_each_entry(part_md, &md->part, part) {
2508                         mmc_queue_suspend(&part_md->queue);
2509                 }
2510         }
2511         return 0;
2512 }
2513
2514 static void mmc_blk_shutdown(struct mmc_card *card)
2515 {
2516         _mmc_blk_suspend(card);
2517 }
2518
2519 #ifdef CONFIG_PM
2520 static int mmc_blk_suspend(struct mmc_card *card)
2521 {
2522         return _mmc_blk_suspend(card);
2523 }
2524
2525 static int mmc_blk_resume(struct mmc_card *card)
2526 {
2527         struct mmc_blk_data *part_md;
2528         struct mmc_blk_data *md = mmc_get_drvdata(card);
2529
2530         if (md) {
2531                 /*
2532                  * Resume involves the card going into idle state,
2533                  * so current partition is always the main one.
2534                  */
2535                 md->part_curr = md->part_type;
2536                 mmc_queue_resume(&md->queue);
2537                 list_for_each_entry(part_md, &md->part, part) {
2538                         mmc_queue_resume(&part_md->queue);
2539                 }
2540         }
2541         return 0;
2542 }
2543 #else
2544 #define mmc_blk_suspend NULL
2545 #define mmc_blk_resume  NULL
2546 #endif
2547
2548 static struct mmc_driver mmc_driver = {
2549         .drv            = {
2550                 .name   = "mmcblk",
2551         },
2552         .probe          = mmc_blk_probe,
2553         .remove         = mmc_blk_remove,
2554         .suspend        = mmc_blk_suspend,
2555         .resume         = mmc_blk_resume,
2556         .shutdown       = mmc_blk_shutdown,
2557 };
2558
2559 static int __init mmc_blk_init(void)
2560 {
2561         int res;
2562
2563         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2564                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2565
2566         max_devices = 256 / perdev_minors;
2567
2568         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2569         if (res)
2570                 goto out;
2571
2572         res = mmc_register_driver(&mmc_driver);
2573         if (res)
2574                 goto out2;
2575
2576         return 0;
2577  out2:
2578         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2579  out:
2580         return res;
2581 }
2582
2583 static void __exit mmc_blk_exit(void)
2584 {
2585         mmc_unregister_driver(&mmc_driver);
2586         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2587 }
2588
2589 module_init(mmc_blk_init);
2590 module_exit(mmc_blk_exit);
2591
2592 MODULE_LICENSE("GPL");
2593 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2594