kernel/drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50
  51 #ifdef KERNEL
  52 #ifdef MODULE_PARAM_PREFIX
  53 #undef MODULE_PARAM_PREFIX
  54 #endif
  55 #define MODULE_PARAM_PREFIX "mmcblk."
  56 #endif
  57
  58 #define INAND_CMD38_ARG_EXT_CSD  113
  59 #define INAND_CMD38_ARG_ERASE    0x00
  60 #define INAND_CMD38_ARG_TRIM     0x01
  61 #define INAND_CMD38_ARG_SECERASE 0x80
  62 #define INAND_CMD38_ARG_SECTRIM1 0x81
  63 #define INAND_CMD38_ARG_SECTRIM2 0x88
  64 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  65 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  66 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  67
  68 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  69                                   (rq_data_dir(req) == WRITE))
  70 #define PACKED_CMD_VER  0x01
  71 #define PACKED_CMD_WR   0x02
  72
  73 static DEFINE_MUTEX(block_mutex);
  74
  75 /*
  76  * The defaults come from config options but can be overriden by module
  77  * or bootarg options.
  78  */
  79 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  80
  81 /*
  82  * We've only got one major, so number of mmcblk devices is
  83  * limited to (1 << 20) / number of minors per device.  It is also
  84  * currently limited by the size of the static bitmaps below.
  85  */
  86 static int max_devices;
  87
  88 #define MAX_DEVICES 256
  89
  90 /* TODO: Replace these with struct ida */
  91 static DECLARE_BITMAP(dev_use, MAX_DEVICES);
  92 static DECLARE_BITMAP(name_use, MAX_DEVICES);
  93
  94 /*
  95  * There is one mmc_blk_data per slot.
  96  */
  97 struct mmc_blk_data {
  98         spinlock_t      lock;
  99         struct gendisk  *disk;
 100         struct mmc_queue queue;
 101         struct list_head part;
 102
 103         unsigned int    flags;
 104 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 105 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 106 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 107
 108         unsigned int    usage;
 109         unsigned int    read_only;
 110         unsigned int    part_type;
 111         unsigned int    name_idx;
 112         unsigned int    reset_done;
 113 #define MMC_BLK_READ            BIT(0)
 114 #define MMC_BLK_WRITE           BIT(1)
 115 #define MMC_BLK_DISCARD         BIT(2)
 116 #define MMC_BLK_SECDISCARD      BIT(3)
 117
 118         /*
 119          * Only set in main mmc_blk_data associated
 120          * with mmc_card with dev_set_drvdata, and keeps
 121          * track of the current selected device partition.
 122          */
 123         unsigned int    part_curr;
 124         struct device_attribute force_ro;
 125         struct device_attribute power_ro_lock;
 126         int     area_type;
 127 };
 128
 129 static DEFINE_MUTEX(open_lock);
 130
 131 enum {
 132         MMC_PACKED_NR_IDX = -1,
 133         MMC_PACKED_NR_ZERO,
 134         MMC_PACKED_NR_SINGLE,
 135 };
 136
 137 module_param(perdev_minors, int, 0444);
 138 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 139
 140 static inline int mmc_blk_part_switch(struct mmc_card *card,
 141                                       struct mmc_blk_data *md);
 142 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 143
 144 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 145 {
 146         struct mmc_packed *packed = mqrq->packed;
 147
 148         BUG_ON(!packed);
 149
 150         mqrq->cmd_type = MMC_PACKED_NONE;
 151         packed->nr_entries = MMC_PACKED_NR_ZERO;
 152         packed->idx_failure = MMC_PACKED_NR_IDX;
 153         packed->retries = 0;
 154         packed->blocks = 0;
 155 }
 156
 157 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 158 {
 159         struct mmc_blk_data *md;
 160
 161         mutex_lock(&open_lock);
 162         md = disk->private_data;
 163         if (md && md->usage == 0)
 164                 md = NULL;
 165         if (md)
 166                 md->usage++;
 167         mutex_unlock(&open_lock);
 168
 169         return md;
 170 }
 171
 172 static inline int mmc_get_devidx(struct gendisk *disk)
 173 {
 174         int devmaj = MAJOR(disk_devt(disk));
 175         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 176
 177         if (!devmaj)
 178                 devidx = disk->first_minor / perdev_minors;
 179         return devidx;
 180 }
 181
 182 static void mmc_blk_put(struct mmc_blk_data *md)
 183 {
 184         mutex_lock(&open_lock);
 185         md->usage--;
 186         if (md->usage == 0) {
 187                 int devidx = mmc_get_devidx(md->disk);
 188                 blk_cleanup_queue(md->queue.queue);
 189
 190                 __clear_bit(devidx, dev_use);
 191
 192                 put_disk(md->disk);
 193                 kfree(md);
 194         }
 195         mutex_unlock(&open_lock);
 196 }
 197
 198 static ssize_t power_ro_lock_show(struct device *dev,
 199                 struct device_attribute *attr, char *buf)
 200 {
 201         int ret;
 202         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 203         struct mmc_card *card = md->queue.card;
 204         int locked = 0;
 205
 206         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 207                 locked = 2;
 208         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 209                 locked = 1;
 210
 211         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 212
 213         mmc_blk_put(md);
 214
 215         return ret;
 216 }
 217
 218 static ssize_t power_ro_lock_store(struct device *dev,
 219                 struct device_attribute *attr, const char *buf, size_t count)
 220 {
 221         int ret;
 222         struct mmc_blk_data *md, *part_md;
 223         struct mmc_card *card;
 224         unsigned long set;
 225
 226         if (kstrtoul(buf, 0, &set))
 227                 return -EINVAL;
 228
 229         if (set != 1)
 230                 return count;
 231
 232         md = mmc_blk_get(dev_to_disk(dev));
 233         card = md->queue.card;
 234
 235         mmc_get_card(card);
 236
 237         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 238                                 card->ext_csd.boot_ro_lock |
 239                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 240                                 card->ext_csd.part_time);
 241         if (ret)
 242                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 243         else
 244                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 245
 246         mmc_put_card(card);
 247
 248         if (!ret) {
 249                 pr_info("%s: Locking boot partition ro until next power on\n",
 250                         md->disk->disk_name);
 251                 set_disk_ro(md->disk, 1);
 252
 253                 list_for_each_entry(part_md, &md->part, part)
 254                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 255                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 256                                 set_disk_ro(part_md->disk, 1);
 257                         }
 258         }
 259
 260         mmc_blk_put(md);
 261         return count;
 262 }
 263
 264 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 265                              char *buf)
 266 {
 267         int ret;
 268         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 269
 270         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 271                        get_disk_ro(dev_to_disk(dev)) ^
 272                        md->read_only);
 273         mmc_blk_put(md);
 274         return ret;
 275 }
 276
 277 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 278                               const char *buf, size_t count)
 279 {
 280         int ret;
 281         char *end;
 282         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 283         unsigned long set = simple_strtoul(buf, &end, 0);
 284         if (end == buf) {
 285                 ret = -EINVAL;
 286                 goto out;
 287         }
 288
 289         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 290         ret = count;
 291 out:
 292         mmc_blk_put(md);
 293         return ret;
 294 }
 295
 296 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 297 {
 298         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 299         int ret = -ENXIO;
 300
 301         mutex_lock(&block_mutex);
 302         if (md) {
 303                 if (md->usage == 2)
 304                         check_disk_change(bdev);
 305                 ret = 0;
 306
 307                 if ((mode & FMODE_WRITE) && md->read_only) {
 308                         mmc_blk_put(md);
 309                         ret = -EROFS;
 310                 }
 311         }
 312         mutex_unlock(&block_mutex);
 313
 314         return ret;
 315 }
 316
 317 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 318 {
 319         struct mmc_blk_data *md = disk->private_data;
 320
 321         mutex_lock(&block_mutex);
 322         mmc_blk_put(md);
 323         mutex_unlock(&block_mutex);
 324 }
 325
 326 static int
 327 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 328 {
 329         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 330         geo->heads = 4;
 331         geo->sectors = 16;
 332         return 0;
 333 }
 334
 335 struct mmc_blk_ioc_data {
 336         struct mmc_ioc_cmd ic;
 337         unsigned char *buf;
 338         u64 buf_bytes;
 339 };
 340
 341 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 342         struct mmc_ioc_cmd __user *user)
 343 {
 344         struct mmc_blk_ioc_data *idata;
 345         int err;
 346
 347         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 348         if (!idata) {
 349                 err = -ENOMEM;
 350                 goto out;
 351         }
 352
 353         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 354                 err = -EFAULT;
 355                 goto idata_err;
 356         }
 357
 358         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 359         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 360                 err = -EOVERFLOW;
 361                 goto idata_err;
 362         }
 363
 364         if (!idata->buf_bytes)
 365                 return idata;
 366
 367         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 368         if (!idata->buf) {
 369                 err = -ENOMEM;
 370                 goto idata_err;
 371         }
 372
 373         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 374                                         idata->ic.data_ptr, idata->buf_bytes)) {
 375                 err = -EFAULT;
 376                 goto copy_err;
 377         }
 378
 379         return idata;
 380
 381 copy_err:
 382         kfree(idata->buf);
 383 idata_err:
 384         kfree(idata);
 385 out:
 386         return ERR_PTR(err);
 387 }
 388
 389 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 390                                       struct mmc_blk_ioc_data *idata)
 391 {
 392         struct mmc_ioc_cmd *ic = &idata->ic;
 393
 394         if (copy_to_user(&(ic_ptr->response), ic->response,
 395                          sizeof(ic->response)))
 396                 return -EFAULT;
 397
 398         if (!idata->ic.write_flag) {
 399                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 400                                  idata->buf, idata->buf_bytes))
 401                         return -EFAULT;
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 408                                        u32 retries_max)
 409 {
 410         int err;
 411         u32 retry_count = 0;
 412
 413         if (!status || !retries_max)
 414                 return -EINVAL;
 415
 416         do {
 417                 err = get_card_status(card, status, 5);
 418                 if (err)
 419                         break;
 420
 421                 if (!R1_STATUS(*status) &&
 422                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 423                         break; /* RPMB programming operation complete */
 424
 425                 /*
 426                  * Rechedule to give the MMC device a chance to continue
 427                  * processing the previous command without being polled too
 428                  * frequently.
 429                  */
 430                 usleep_range(1000, 5000);
 431         } while (++retry_count < retries_max);
 432
 433         if (retry_count == retries_max)
 434                 err = -EPERM;
 435
 436         return err;
 437 }
 438
 439 static int ioctl_do_sanitize(struct mmc_card *card)
 440 {
 441         int err;
 442
 443         if (!mmc_can_sanitize(card)) {
 444                         pr_warn("%s: %s - SANITIZE is not supported\n",
 445                                 mmc_hostname(card->host), __func__);
 446                         err = -EOPNOTSUPP;
 447                         goto out;
 448         }
 449
 450         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 451                 mmc_hostname(card->host), __func__);
 452
 453         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 454                                         EXT_CSD_SANITIZE_START, 1,
 455                                         MMC_SANITIZE_REQ_TIMEOUT);
 456
 457         if (err)
 458                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 459                        mmc_hostname(card->host), __func__, err);
 460
 461         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 462                                              __func__);
 463 out:
 464         return err;
 465 }
 466
 467 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 468                                struct mmc_blk_ioc_data *idata)
 469 {
 470         struct mmc_command cmd = {0};
 471         struct mmc_data data = {0};
 472         struct mmc_request mrq = {NULL};
 473         struct scatterlist sg;
 474         int err;
 475         int is_rpmb = false;
 476         u32 status = 0;
 477
 478         if (!card || !md || !idata)
 479                 return -EINVAL;
 480
 481         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 482                 is_rpmb = true;
 483
 484         cmd.opcode = idata->ic.opcode;
 485         cmd.arg = idata->ic.arg;
 486         cmd.flags = idata->ic.flags;
 487
 488         if (idata->buf_bytes) {
 489                 data.sg = &sg;
 490                 data.sg_len = 1;
 491                 data.blksz = idata->ic.blksz;
 492                 data.blocks = idata->ic.blocks;
 493
 494                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 495
 496                 if (idata->ic.write_flag)
 497                         data.flags = MMC_DATA_WRITE;
 498                 else
 499                         data.flags = MMC_DATA_READ;
 500
 501                 /* data.flags must already be set before doing this. */
 502                 mmc_set_data_timeout(&data, card);
 503
 504                 /* Allow overriding the timeout_ns for empirical tuning. */
 505                 if (idata->ic.data_timeout_ns)
 506                         data.timeout_ns = idata->ic.data_timeout_ns;
 507
 508                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 509                         /*
 510                          * Pretend this is a data transfer and rely on the
 511                          * host driver to compute timeout.  When all host
 512                          * drivers support cmd.cmd_timeout for R1B, this
 513                          * can be changed to:
 514                          *
 515                          *     mrq.data = NULL;
 516                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 517                          */
 518                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 519                 }
 520
 521                 mrq.data = &data;
 522         }
 523
 524         mrq.cmd = &cmd;
 525
 526         err = mmc_blk_part_switch(card, md);
 527         if (err)
 528                 return err;
 529
 530         if (idata->ic.is_acmd) {
 531                 err = mmc_app_cmd(card->host, card);
 532                 if (err)
 533                         return err;
 534         }
 535
 536         if (is_rpmb) {
 537                 err = mmc_set_blockcount(card, data.blocks,
 538                         idata->ic.write_flag & (1 << 31));
 539                 if (err)
 540                         return err;
 541         }
 542
 543         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 544             (cmd.opcode == MMC_SWITCH)) {
 545                 err = ioctl_do_sanitize(card);
 546
 547                 if (err)
 548                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 549                                __func__, err);
 550
 551                 return err;
 552         }
 553
 554         mmc_wait_for_req(card->host, &mrq);
 555
 556         if (cmd.error) {
 557                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 558                                                 __func__, cmd.error);
 559                 return cmd.error;
 560         }
 561         if (data.error) {
 562                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 563                                                 __func__, data.error);
 564                 return data.error;
 565         }
 566
 567         /*
 568          * According to the SD specs, some commands require a delay after
 569          * issuing the command.
 570          */
 571         if (idata->ic.postsleep_min_us)
 572                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 573
 574         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 575
 576         if (is_rpmb) {
 577                 /*
 578                  * Ensure RPMB command has completed by polling CMD13
 579                  * "Send Status".
 580                  */
 581                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 582                 if (err)
 583                         dev_err(mmc_dev(card->host),
 584                                         "%s: Card Status=0x%08X, error %d\n",
 585                                         __func__, status, err);
 586         }
 587
 588         return err;
 589 }
 590
 591 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 592                              struct mmc_ioc_cmd __user *ic_ptr)
 593 {
 594         struct mmc_blk_ioc_data *idata;
 595         struct mmc_blk_data *md;
 596         struct mmc_card *card;
 597         int err = 0, ioc_err = 0;
 598
 599         /*
 600          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 601          * whole block device, not on a partition.  This prevents overspray
 602          * between sibling partitions.
 603          */
 604         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 605                 return -EPERM;
 606
 607         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 608         if (IS_ERR(idata))
 609                 return PTR_ERR(idata);
 610
 611         md = mmc_blk_get(bdev->bd_disk);
 612         if (!md) {
 613                 err = -EINVAL;
 614                 goto cmd_err;
 615         }
 616
 617         card = md->queue.card;
 618         if (IS_ERR(card)) {
 619                 err = PTR_ERR(card);
 620                 goto cmd_done;
 621         }
 622
 623         mmc_get_card(card);
 624
 625         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 626
 627         mmc_put_card(card);
 628
 629         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 630
 631 cmd_done:
 632         mmc_blk_put(md);
 633 cmd_err:
 634         kfree(idata->buf);
 635         kfree(idata);
 636         return ioc_err ? ioc_err : err;
 637 }
 638
 639 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 640                                    struct mmc_ioc_multi_cmd __user *user)
 641 {
 642         struct mmc_blk_ioc_data **idata = NULL;
 643         struct mmc_ioc_cmd __user *cmds = user->cmds;
 644         struct mmc_card *card;
 645         struct mmc_blk_data *md;
 646         int i, err = 0, ioc_err = 0;
 647         __u64 num_of_cmds;
 648
 649         /*
 650          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 651          * whole block device, not on a partition.  This prevents overspray
 652          * between sibling partitions.
 653          */
 654         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 655                 return -EPERM;
 656
 657         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 658                            sizeof(num_of_cmds)))
 659                 return -EFAULT;
 660
 661         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 662                 return -EINVAL;
 663
 664         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 665         if (!idata)
 666                 return -ENOMEM;
 667
 668         for (i = 0; i < num_of_cmds; i++) {
 669                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 670                 if (IS_ERR(idata[i])) {
 671                         err = PTR_ERR(idata[i]);
 672                         num_of_cmds = i;
 673                         goto cmd_err;
 674                 }
 675         }
 676
 677         md = mmc_blk_get(bdev->bd_disk);
 678         if (!md)
 679                 goto cmd_err;
 680
 681         card = md->queue.card;
 682         if (IS_ERR(card)) {
 683                 err = PTR_ERR(card);
 684                 goto cmd_done;
 685         }
 686
 687         mmc_get_card(card);
 688
 689         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 690                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 691
 692         mmc_put_card(card);
 693
 694         /* copy to user if data and response */
 695         for (i = 0; i < num_of_cmds && !err; i++)
 696                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 697
 698 cmd_done:
 699         mmc_blk_put(md);
 700 cmd_err:
 701         for (i = 0; i < num_of_cmds; i++) {
 702                 kfree(idata[i]->buf);
 703                 kfree(idata[i]);
 704         }
 705         kfree(idata);
 706         return ioc_err ? ioc_err : err;
 707 }
 708
 709 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 710         unsigned int cmd, unsigned long arg)
 711 {
 712         switch (cmd) {
 713         case MMC_IOC_CMD:
 714                 return mmc_blk_ioctl_cmd(bdev,
 715                                 (struct mmc_ioc_cmd __user *)arg);
 716         case MMC_IOC_MULTI_CMD:
 717                 return mmc_blk_ioctl_multi_cmd(bdev,
 718                                 (struct mmc_ioc_multi_cmd __user *)arg);
 719         default:
 720                 return -EINVAL;
 721         }
 722 }
 723
 724 #ifdef CONFIG_COMPAT
 725 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 726         unsigned int cmd, unsigned long arg)
 727 {
 728         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 729 }
 730 #endif
 731
 732 static const struct block_device_operations mmc_bdops = {
 733         .open                   = mmc_blk_open,
 734         .release                = mmc_blk_release,
 735         .getgeo                 = mmc_blk_getgeo,
 736         .owner                  = THIS_MODULE,
 737         .ioctl                  = mmc_blk_ioctl,
 738 #ifdef CONFIG_COMPAT
 739         .compat_ioctl           = mmc_blk_compat_ioctl,
 740 #endif
 741 };
 742
 743 static inline int mmc_blk_part_switch(struct mmc_card *card,
 744                                       struct mmc_blk_data *md)
 745 {
 746         int ret;
 747         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 748
 749         if (main_md->part_curr == md->part_type)
 750                 return 0;
 751
 752         if (mmc_card_mmc(card)) {
 753                 u8 part_config = card->ext_csd.part_config;
 754
 755                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 756                 part_config |= md->part_type;
 757
 758                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 759                                  EXT_CSD_PART_CONFIG, part_config,
 760                                  card->ext_csd.part_time);
 761                 if (ret)
 762                         return ret;
 763
 764                 card->ext_csd.part_config = part_config;
 765         }
 766
 767         main_md->part_curr = md->part_type;
 768         return 0;
 769 }
 770
 771 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 772 {
 773         int err;
 774         u32 result;
 775         __be32 *blocks;
 776
 777         struct mmc_request mrq = {NULL};
 778         struct mmc_command cmd = {0};
 779         struct mmc_data data = {0};
 780
 781         struct scatterlist sg;
 782
 783         cmd.opcode = MMC_APP_CMD;
 784         cmd.arg = card->rca << 16;
 785         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 786
 787         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 788         if (err)
 789                 return (u32)-1;
 790         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 791                 return (u32)-1;
 792
 793         memset(&cmd, 0, sizeof(struct mmc_command));
 794
 795         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 796         cmd.arg = 0;
 797         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 798
 799         data.blksz = 4;
 800         data.blocks = 1;
 801         data.flags = MMC_DATA_READ;
 802         data.sg = &sg;
 803         data.sg_len = 1;
 804         mmc_set_data_timeout(&data, card);
 805
 806         mrq.cmd = &cmd;
 807         mrq.data = &data;
 808
 809         blocks = kmalloc(4, GFP_KERNEL);
 810         if (!blocks)
 811                 return (u32)-1;
 812
 813         sg_init_one(&sg, blocks, 4);
 814
 815         mmc_wait_for_req(card->host, &mrq);
 816
 817         result = ntohl(*blocks);
 818         kfree(blocks);
 819
 820         if (cmd.error || data.error)
 821                 result = (u32)-1;
 822
 823         return result;
 824 }
 825
 826 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 827 {
 828         struct mmc_command cmd = {0};
 829         int err;
 830
 831         cmd.opcode = MMC_SEND_STATUS;
 832         if (!mmc_host_is_spi(card->host))
 833                 cmd.arg = card->rca << 16;
 834         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 835         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 836         if (err == 0)
 837                 *status = cmd.resp[0];
 838         return err;
 839 }
 840
 841 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 842                 bool hw_busy_detect, struct request *req, int *gen_err)
 843 {
 844         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 845         int err = 0;
 846         u32 status;
 847
 848         do {
 849                 err = get_card_status(card, &status, 5);
 850                 if (err) {
 851                         pr_err("%s: error %d requesting status\n",
 852                                req->rq_disk->disk_name, err);
 853                         return err;
 854                 }
 855
 856                 if (status & R1_ERROR) {
 857                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 858                                 req->rq_disk->disk_name, __func__, status);
 859                         *gen_err = 1;
 860                 }
 861
 862                 /* We may rely on the host hw to handle busy detection.*/
 863                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 864                         hw_busy_detect)
 865                         break;
 866
 867                 /*
 868                  * Timeout if the device never becomes ready for data and never
 869                  * leaves the program state.
 870                  */
 871                 if (time_after(jiffies, timeout)) {
 872                         pr_err("%s: Card stuck in programming state! %s %s\n",
 873                                 mmc_hostname(card->host),
 874                                 req->rq_disk->disk_name, __func__);
 875                         return -ETIMEDOUT;
 876                 }
 877
 878                 /*
 879                  * Some cards mishandle the status bits,
 880                  * so make sure to check both the busy
 881                  * indication and the card state.
 882                  */
 883         } while (!(status & R1_READY_FOR_DATA) ||
 884                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 885
 886         return err;
 887 }
 888
 889 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 890                 struct request *req, int *gen_err, u32 *stop_status)
 891 {
 892         struct mmc_host *host = card->host;
 893         struct mmc_command cmd = {0};
 894         int err;
 895         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 896
 897         /*
 898          * Normally we use R1B responses for WRITE, but in cases where the host
 899          * has specified a max_busy_timeout we need to validate it. A failure
 900          * means we need to prevent the host from doing hw busy detection, which
 901          * is done by converting to a R1 response instead.
 902          */
 903         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 904                 use_r1b_resp = false;
 905
 906         cmd.opcode = MMC_STOP_TRANSMISSION;
 907         if (use_r1b_resp) {
 908                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 909                 cmd.busy_timeout = timeout_ms;
 910         } else {
 911                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 912         }
 913
 914         err = mmc_wait_for_cmd(host, &cmd, 5);
 915         if (err)
 916                 return err;
 917
 918         *stop_status = cmd.resp[0];
 919
 920         /* No need to check card status in case of READ. */
 921         if (rq_data_dir(req) == READ)
 922                 return 0;
 923
 924         if (!mmc_host_is_spi(host) &&
 925                 (*stop_status & R1_ERROR)) {
 926                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 927                         req->rq_disk->disk_name, __func__, *stop_status);
 928                 *gen_err = 1;
 929         }
 930
 931         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 932 }
 933
 934 #define ERR_NOMEDIUM    3
 935 #define ERR_RETRY       2
 936 #define ERR_ABORT       1
 937 #define ERR_CONTINUE    0
 938
 939 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 940         bool status_valid, u32 status)
 941 {
 942         switch (error) {
 943         case -EILSEQ:
 944                 /* response crc error, retry the r/w cmd */
 945                 pr_err("%s: %s sending %s command, card status %#x\n",
 946                         req->rq_disk->disk_name, "response CRC error",
 947                         name, status);
 948                 return ERR_RETRY;
 949
 950         case -ETIMEDOUT:
 951                 pr_err("%s: %s sending %s command, card status %#x\n",
 952                         req->rq_disk->disk_name, "timed out", name, status);
 953
 954                 /* If the status cmd initially failed, retry the r/w cmd */
 955                 if (!status_valid)
 956                         return ERR_RETRY;
 957
 958                 /*
 959                  * If it was a r/w cmd crc error, or illegal command
 960                  * (eg, issued in wrong state) then retry - we should
 961                  * have corrected the state problem above.
 962                  */
 963                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 964                         return ERR_RETRY;
 965
 966                 /* Otherwise abort the command */
 967                 return ERR_ABORT;
 968
 969         default:
 970                 /* We don't understand the error code the driver gave us */
 971                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 972                        req->rq_disk->disk_name, error, status);
 973                 return ERR_ABORT;
 974         }
 975 }
 976
 977 /*
 978  * Initial r/w and stop cmd error recovery.
 979  * We don't know whether the card received the r/w cmd or not, so try to
 980  * restore things back to a sane state.  Essentially, we do this as follows:
 981  * - Obtain card status.  If the first attempt to obtain card status fails,
 982  *   the status word will reflect the failed status cmd, not the failed
 983  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 984  *   longer communicate with the card.
 985  * - Check the card state.  If the card received the cmd but there was a
 986  *   transient problem with the response, it might still be in a data transfer
 987  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 988  * - If the r/w cmd failed due to a response CRC error, it was probably
 989  *   transient, so retry the cmd.
 990  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 991  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 992  *   illegal cmd, retry.
 993  * Otherwise we don't understand what happened, so abort.
 994  */
 995 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 996         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 997 {
 998         bool prev_cmd_status_valid = true;
 999         u32 status, stop_status = 0;
1000         int err, retry;
1001
1002         if (mmc_card_removed(card))
1003                 return ERR_NOMEDIUM;
1004
1005         /*
1006          * Try to get card status which indicates both the card state
1007          * and why there was no response.  If the first attempt fails,
1008          * we can't be sure the returned status is for the r/w command.
1009          */
1010         for (retry = 2; retry >= 0; retry--) {
1011                 err = get_card_status(card, &status, 0);
1012                 if (!err)
1013                         break;
1014
1015                 /* Re-tune if needed */
1016                 mmc_retune_recheck(card->host);
1017
1018                 prev_cmd_status_valid = false;
1019                 pr_err("%s: error %d sending status command, %sing\n",
1020                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1021         }
1022
1023         /* We couldn't get a response from the card.  Give up. */
1024         if (err) {
1025                 /* Check if the card is removed */
1026                 if (mmc_detect_card_removed(card->host))
1027                         return ERR_NOMEDIUM;
1028                 return ERR_ABORT;
1029         }
1030
1031         /* Flag ECC errors */
1032         if ((status & R1_CARD_ECC_FAILED) ||
1033             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1034             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1035                 *ecc_err = 1;
1036
1037         /* Flag General errors */
1038         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1039                 if ((status & R1_ERROR) ||
1040                         (brq->stop.resp[0] & R1_ERROR)) {
1041                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1042                                req->rq_disk->disk_name, __func__,
1043                                brq->stop.resp[0], status);
1044                         *gen_err = 1;
1045                 }
1046
1047         /*
1048          * Check the current card state.  If it is in some data transfer
1049          * mode, tell it to stop (and hopefully transition back to TRAN.)
1050          */
1051         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1052             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1053                 err = send_stop(card,
1054                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1055                         req, gen_err, &stop_status);
1056                 if (err) {
1057                         pr_err("%s: error %d sending stop command\n",
1058                                req->rq_disk->disk_name, err);
1059                         /*
1060                          * If the stop cmd also timed out, the card is probably
1061                          * not present, so abort. Other errors are bad news too.
1062                          */
1063                         return ERR_ABORT;
1064                 }
1065
1066                 if (stop_status & R1_CARD_ECC_FAILED)
1067                         *ecc_err = 1;
1068         }
1069
1070         /* Check for set block count errors */
1071         if (brq->sbc.error)
1072                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1073                                 prev_cmd_status_valid, status);
1074
1075         /* Check for r/w command errors */
1076         if (brq->cmd.error)
1077                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1078                                 prev_cmd_status_valid, status);
1079
1080         /* Data errors */
1081         if (!brq->stop.error)
1082                 return ERR_CONTINUE;
1083
1084         /* Now for stop errors.  These aren't fatal to the transfer. */
1085         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1086                req->rq_disk->disk_name, brq->stop.error,
1087                brq->cmd.resp[0], status);
1088
1089         /*
1090          * Subsitute in our own stop status as this will give the error
1091          * state which happened during the execution of the r/w command.
1092          */
1093         if (stop_status) {
1094                 brq->stop.resp[0] = stop_status;
1095                 brq->stop.error = 0;
1096         }
1097         return ERR_CONTINUE;
1098 }
1099
1100 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1101                          int type)
1102 {
1103         int err;
1104
1105         if (md->reset_done & type)
1106                 return -EEXIST;
1107
1108         md->reset_done |= type;
1109         err = mmc_hw_reset(host);
1110         /* Ensure we switch back to the correct partition */
1111         if (err != -EOPNOTSUPP) {
1112                 struct mmc_blk_data *main_md =
1113                         dev_get_drvdata(&host->card->dev);
1114                 int part_err;
1115
1116                 main_md->part_curr = main_md->part_type;
1117                 part_err = mmc_blk_part_switch(host->card, md);
1118                 if (part_err) {
1119                         /*
1120                          * We have failed to get back into the correct
1121                          * partition, so we need to abort the whole request.
1122                          */
1123                         return -ENODEV;
1124                 }
1125         }
1126         return err;
1127 }
1128
1129 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1130 {
1131         md->reset_done &= ~type;
1132 }
1133
1134 int mmc_access_rpmb(struct mmc_queue *mq)
1135 {
1136         struct mmc_blk_data *md = mq->data;
1137         /*
1138          * If this is a RPMB partition access, return ture
1139          */
1140         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1141                 return true;
1142
1143         return false;
1144 }
1145
1146 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1147 {
1148         struct mmc_blk_data *md = mq->data;
1149         struct mmc_card *card = md->queue.card;
1150         unsigned int from, nr, arg;
1151         int err = 0, type = MMC_BLK_DISCARD;
1152
1153         if (!mmc_can_erase(card)) {
1154                 err = -EOPNOTSUPP;
1155                 goto out;
1156         }
1157
1158         from = blk_rq_pos(req);
1159         nr = blk_rq_sectors(req);
1160
1161         if (mmc_can_discard(card))
1162                 arg = MMC_DISCARD_ARG;
1163         else if (mmc_can_trim(card))
1164                 arg = MMC_TRIM_ARG;
1165         else
1166                 arg = MMC_ERASE_ARG;
1167 retry:
1168         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1169                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1170                                  INAND_CMD38_ARG_EXT_CSD,
1171                                  arg == MMC_TRIM_ARG ?
1172                                  INAND_CMD38_ARG_TRIM :
1173                                  INAND_CMD38_ARG_ERASE,
1174                                  0);
1175                 if (err)
1176                         goto out;
1177         }
1178         err = mmc_erase(card, from, nr, arg);
1179 out:
1180         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1181                 goto retry;
1182         if (!err)
1183                 mmc_blk_reset_success(md, type);
1184         blk_end_request(req, err, blk_rq_bytes(req));
1185
1186         return err ? 0 : 1;
1187 }
1188
1189 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1190                                        struct request *req)
1191 {
1192         struct mmc_blk_data *md = mq->data;
1193         struct mmc_card *card = md->queue.card;
1194         unsigned int from, nr, arg;
1195         int err = 0, type = MMC_BLK_SECDISCARD;
1196
1197         if (!(mmc_can_secure_erase_trim(card))) {
1198                 err = -EOPNOTSUPP;
1199                 goto out;
1200         }
1201
1202         from = blk_rq_pos(req);
1203         nr = blk_rq_sectors(req);
1204
1205         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1206                 arg = MMC_SECURE_TRIM1_ARG;
1207         else
1208                 arg = MMC_SECURE_ERASE_ARG;
1209
1210 retry:
1211         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1212                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1213                                  INAND_CMD38_ARG_EXT_CSD,
1214                                  arg == MMC_SECURE_TRIM1_ARG ?
1215                                  INAND_CMD38_ARG_SECTRIM1 :
1216                                  INAND_CMD38_ARG_SECERASE,
1217                                  0);
1218                 if (err)
1219                         goto out_retry;
1220         }
1221
1222         err = mmc_erase(card, from, nr, arg);
1223         if (err == -EIO)
1224                 goto out_retry;
1225         if (err)
1226                 goto out;
1227
1228         if (arg == MMC_SECURE_TRIM1_ARG) {
1229                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1230                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1231                                          INAND_CMD38_ARG_EXT_CSD,
1232                                          INAND_CMD38_ARG_SECTRIM2,
1233                                          0);
1234                         if (err)
1235                                 goto out_retry;
1236                 }
1237
1238                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1239                 if (err == -EIO)
1240                         goto out_retry;
1241                 if (err)
1242                         goto out;
1243         }
1244
1245 out_retry:
1246         if (err && !mmc_blk_reset(md, card->host, type))
1247                 goto retry;
1248         if (!err)
1249                 mmc_blk_reset_success(md, type);
1250 out:
1251         blk_end_request(req, err, blk_rq_bytes(req));
1252
1253         return err ? 0 : 1;
1254 }
1255
1256 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1257 {
1258         struct mmc_blk_data *md = mq->data;
1259         struct mmc_card *card = md->queue.card;
1260         int ret = 0;
1261
1262         ret = mmc_flush_cache(card);
1263         if (ret)
1264                 ret = -EIO;
1265
1266         blk_end_request_all(req, ret);
1267
1268         return ret ? 0 : 1;
1269 }
1270
1271 /*
1272  * Reformat current write as a reliable write, supporting
1273  * both legacy and the enhanced reliable write MMC cards.
1274  * In each transfer we'll handle only as much as a single
1275  * reliable write can handle, thus finish the request in
1276  * partial completions.
1277  */
1278 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1279                                     struct mmc_card *card,
1280                                     struct request *req)
1281 {
1282         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1283                 /* Legacy mode imposes restrictions on transfers. */
1284                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1285                         brq->data.blocks = 1;
1286
1287                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1288                         brq->data.blocks = card->ext_csd.rel_sectors;
1289                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1290                         brq->data.blocks = 1;
1291         }
1292 }
1293
1294 #define CMD_ERRORS                                                      \
1295         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1296          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1297          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1298          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1299          R1_CC_ERROR |          /* Card controller error */             \
1300          R1_ERROR)              /* General/unknown error */
1301
1302 static int mmc_blk_err_check(struct mmc_card *card,
1303                              struct mmc_async_req *areq)
1304 {
1305         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1306                                                     mmc_active);
1307         struct mmc_blk_request *brq = &mq_mrq->brq;
1308         struct request *req = mq_mrq->req;
1309         int need_retune = card->host->need_retune;
1310         int ecc_err = 0, gen_err = 0;
1311
1312         /*
1313          * sbc.error indicates a problem with the set block count
1314          * command.  No data will have been transferred.
1315          *
1316          * cmd.error indicates a problem with the r/w command.  No
1317          * data will have been transferred.
1318          *
1319          * stop.error indicates a problem with the stop command.  Data
1320          * may have been transferred, or may still be transferring.
1321          */
1322         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1323             brq->data.error) {
1324                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1325                 case ERR_RETRY:
1326                         return MMC_BLK_RETRY;
1327                 case ERR_ABORT:
1328                         return MMC_BLK_ABORT;
1329                 case ERR_NOMEDIUM:
1330                         return MMC_BLK_NOMEDIUM;
1331                 case ERR_CONTINUE:
1332                         break;
1333                 }
1334         }
1335
1336         /*
1337          * Check for errors relating to the execution of the
1338          * initial command - such as address errors.  No data
1339          * has been transferred.
1340          */
1341         if (brq->cmd.resp[0] & CMD_ERRORS) {
1342                 pr_err("%s: r/w command failed, status = %#x\n",
1343                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1344                 return MMC_BLK_ABORT;
1345         }
1346
1347         /*
1348          * Everything else is either success, or a data error of some
1349          * kind.  If it was a write, we may have transitioned to
1350          * program mode, which we have to wait for it to complete.
1351          */
1352         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1353                 int err;
1354
1355                 /* Check stop command response */
1356                 if (brq->stop.resp[0] & R1_ERROR) {
1357                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1358                                req->rq_disk->disk_name, __func__,
1359                                brq->stop.resp[0]);
1360                         gen_err = 1;
1361                 }
1362
1363                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1364                                         &gen_err);
1365                 if (err)
1366                         return MMC_BLK_CMD_ERR;
1367         }
1368
1369         /* if general error occurs, retry the write operation. */
1370         if (gen_err) {
1371                 pr_warn("%s: retrying write for general error\n",
1372                                 req->rq_disk->disk_name);
1373                 return MMC_BLK_RETRY;
1374         }
1375
1376         if (brq->data.error) {
1377                 if (need_retune && !brq->retune_retry_done) {
1378                         pr_info("%s: retrying because a re-tune was needed\n",
1379                                 req->rq_disk->disk_name);
1380                         brq->retune_retry_done = 1;
1381                         return MMC_BLK_RETRY;
1382                 }
1383                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1384                        req->rq_disk->disk_name, brq->data.error,
1385                        (unsigned)blk_rq_pos(req),
1386                        (unsigned)blk_rq_sectors(req),
1387                        brq->cmd.resp[0], brq->stop.resp[0]);
1388
1389                 if (rq_data_dir(req) == READ) {
1390                         if (ecc_err)
1391                                 return MMC_BLK_ECC_ERR;
1392                         return MMC_BLK_DATA_ERR;
1393                 } else {
1394                         return MMC_BLK_CMD_ERR;
1395                 }
1396         }
1397
1398         if (!brq->data.bytes_xfered)
1399                 return MMC_BLK_RETRY;
1400
1401         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1402                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1403                         return MMC_BLK_PARTIAL;
1404                 else
1405                         return MMC_BLK_SUCCESS;
1406         }
1407
1408         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1409                 return MMC_BLK_PARTIAL;
1410
1411         return MMC_BLK_SUCCESS;
1412 }
1413
1414 static int mmc_blk_packed_err_check(struct mmc_card *card,
1415                                     struct mmc_async_req *areq)
1416 {
1417         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1418                         mmc_active);
1419         struct request *req = mq_rq->req;
1420         struct mmc_packed *packed = mq_rq->packed;
1421         int err, check, status;
1422         u8 *ext_csd;
1423
1424         BUG_ON(!packed);
1425
1426         packed->retries--;
1427         check = mmc_blk_err_check(card, areq);
1428         err = get_card_status(card, &status, 0);
1429         if (err) {
1430                 pr_err("%s: error %d sending status command\n",
1431                        req->rq_disk->disk_name, err);
1432                 return MMC_BLK_ABORT;
1433         }
1434
1435         if (status & R1_EXCEPTION_EVENT) {
1436                 err = mmc_get_ext_csd(card, &ext_csd);
1437                 if (err) {
1438                         pr_err("%s: error %d sending ext_csd\n",
1439                                req->rq_disk->disk_name, err);
1440                         return MMC_BLK_ABORT;
1441                 }
1442
1443                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1444                      EXT_CSD_PACKED_FAILURE) &&
1445                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1446                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1447                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1448                             EXT_CSD_PACKED_INDEXED_ERROR) {
1449                                 packed->idx_failure =
1450                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1451                                 check = MMC_BLK_PARTIAL;
1452                         }
1453                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1454                                "failure index: %d\n",
1455                                req->rq_disk->disk_name, packed->nr_entries,
1456                                packed->blocks, packed->idx_failure);
1457                 }
1458                 kfree(ext_csd);
1459         }
1460
1461         return check;
1462 }
1463
1464 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1465                                struct mmc_card *card,
1466                                int disable_multi,
1467                                struct mmc_queue *mq)
1468 {
1469         u32 readcmd, writecmd;
1470         struct mmc_blk_request *brq = &mqrq->brq;
1471         struct request *req = mqrq->req;
1472         struct mmc_blk_data *md = mq->data;
1473         bool do_data_tag;
1474
1475         /*
1476          * Reliable writes are used to implement Forced Unit Access and
1477          * are supported only on MMCs.
1478          */
1479         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1480                 (rq_data_dir(req) == WRITE) &&
1481                 (md->flags & MMC_BLK_REL_WR);
1482
1483         memset(brq, 0, sizeof(struct mmc_blk_request));
1484         brq->mrq.cmd = &brq->cmd;
1485         brq->mrq.data = &brq->data;
1486
1487         brq->cmd.arg = blk_rq_pos(req);
1488         if (!mmc_card_blockaddr(card))
1489                 brq->cmd.arg <<= 9;
1490         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1491         brq->data.blksz = 512;
1492         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1493         brq->stop.arg = 0;
1494         brq->data.blocks = blk_rq_sectors(req);
1495
1496         /*
1497          * The block layer doesn't support all sector count
1498          * restrictions, so we need to be prepared for too big
1499          * requests.
1500          */
1501         if (brq->data.blocks > card->host->max_blk_count)
1502                 brq->data.blocks = card->host->max_blk_count;
1503
1504         if (brq->data.blocks > 1) {
1505                 /*
1506                  * After a read error, we redo the request one sector
1507                  * at a time in order to accurately determine which
1508                  * sectors can be read successfully.
1509                  */
1510                 if (disable_multi)
1511                         brq->data.blocks = 1;
1512
1513                 /*
1514                  * Some controllers have HW issues while operating
1515                  * in multiple I/O mode
1516                  */
1517                 if (card->host->ops->multi_io_quirk)
1518                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1519                                                 (rq_data_dir(req) == READ) ?
1520                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1521                                                 brq->data.blocks);
1522         }
1523
1524         if (brq->data.blocks > 1 || do_rel_wr) {
1525                 /* SPI multiblock writes terminate using a special
1526                  * token, not a STOP_TRANSMISSION request.
1527                  */
1528                 if (!mmc_host_is_spi(card->host) ||
1529                     rq_data_dir(req) == READ)
1530                         brq->mrq.stop = &brq->stop;
1531                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1532                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1533         } else {
1534                 brq->mrq.stop = NULL;
1535                 readcmd = MMC_READ_SINGLE_BLOCK;
1536                 writecmd = MMC_WRITE_BLOCK;
1537         }
1538         if (rq_data_dir(req) == READ) {
1539                 brq->cmd.opcode = readcmd;
1540                 brq->data.flags |= MMC_DATA_READ;
1541                 if (brq->mrq.stop)
1542                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1543                                         MMC_CMD_AC;
1544         } else {
1545                 brq->cmd.opcode = writecmd;
1546                 brq->data.flags |= MMC_DATA_WRITE;
1547                 if (brq->mrq.stop)
1548                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1549                                         MMC_CMD_AC;
1550         }
1551
1552         if (do_rel_wr)
1553                 mmc_apply_rel_rw(brq, card, req);
1554
1555         /*
1556          * Data tag is used only during writing meta data to speed
1557          * up write and any subsequent read of this meta data
1558          */
1559         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1560                 (req->cmd_flags & REQ_META) &&
1561                 (rq_data_dir(req) == WRITE) &&
1562                 ((brq->data.blocks * brq->data.blksz) >=
1563                  card->ext_csd.data_tag_unit_size);
1564
1565         /*
1566          * Pre-defined multi-block transfers are preferable to
1567          * open ended-ones (and necessary for reliable writes).
1568          * However, it is not sufficient to just send CMD23,
1569          * and avoid the final CMD12, as on an error condition
1570          * CMD12 (stop) needs to be sent anyway. This, coupled
1571          * with Auto-CMD23 enhancements provided by some
1572          * hosts, means that the complexity of dealing
1573          * with this is best left to the host. If CMD23 is
1574          * supported by card and host, we'll fill sbc in and let
1575          * the host deal with handling it correctly. This means
1576          * that for hosts that don't expose MMC_CAP_CMD23, no
1577          * change of behavior will be observed.
1578          *
1579          * N.B: Some MMC cards experience perf degradation.
1580          * We'll avoid using CMD23-bounded multiblock writes for
1581          * these, while retaining features like reliable writes.
1582          */
1583         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1584             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1585              do_data_tag)) {
1586                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1587                 brq->sbc.arg = brq->data.blocks |
1588                         (do_rel_wr ? (1 << 31) : 0) |
1589                         (do_data_tag ? (1 << 29) : 0);
1590                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1591                 brq->mrq.sbc = &brq->sbc;
1592         }
1593
1594         mmc_set_data_timeout(&brq->data, card);
1595
1596         brq->data.sg = mqrq->sg;
1597         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1598
1599         /*
1600          * Adjust the sg list so it is the same size as the
1601          * request.
1602          */
1603         if (brq->data.blocks != blk_rq_sectors(req)) {
1604                 int i, data_size = brq->data.blocks << 9;
1605                 struct scatterlist *sg;
1606
1607                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1608                         data_size -= sg->length;
1609                         if (data_size <= 0) {
1610                                 sg->length += data_size;
1611                                 i++;
1612                                 break;
1613                         }
1614                 }
1615                 brq->data.sg_len = i;
1616         }
1617
1618         mqrq->mmc_active.mrq = &brq->mrq;
1619         mqrq->mmc_active.err_check = mmc_blk_err_check;
1620
1621         mmc_queue_bounce_pre(mqrq);
1622 }
1623
1624 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1625                                           struct mmc_card *card)
1626 {
1627         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1628         unsigned int max_seg_sz = queue_max_segment_size(q);
1629         unsigned int len, nr_segs = 0;
1630
1631         do {
1632                 len = min(hdr_sz, max_seg_sz);
1633                 hdr_sz -= len;
1634                 nr_segs++;
1635         } while (hdr_sz);
1636
1637         return nr_segs;
1638 }
1639
1640 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1641 {
1642         struct request_queue *q = mq->queue;
1643         struct mmc_card *card = mq->card;
1644         struct request *cur = req, *next = NULL;
1645         struct mmc_blk_data *md = mq->data;
1646         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1647         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1648         unsigned int req_sectors = 0, phys_segments = 0;
1649         unsigned int max_blk_count, max_phys_segs;
1650         bool put_back = true;
1651         u8 max_packed_rw = 0;
1652         u8 reqs = 0;
1653
1654         if (!(md->flags & MMC_BLK_PACKED_CMD))
1655                 goto no_packed;
1656
1657         if ((rq_data_dir(cur) == WRITE) &&
1658             mmc_host_packed_wr(card->host))
1659                 max_packed_rw = card->ext_csd.max_packed_writes;
1660
1661         if (max_packed_rw == 0)
1662                 goto no_packed;
1663
1664         if (mmc_req_rel_wr(cur) &&
1665             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1666                 goto no_packed;
1667
1668         if (mmc_large_sector(card) &&
1669             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1670                 goto no_packed;
1671
1672         mmc_blk_clear_packed(mqrq);
1673
1674         max_blk_count = min(card->host->max_blk_count,
1675                             card->host->max_req_size >> 9);
1676         if (unlikely(max_blk_count > 0xffff))
1677                 max_blk_count = 0xffff;
1678
1679         max_phys_segs = queue_max_segments(q);
1680         req_sectors += blk_rq_sectors(cur);
1681         phys_segments += cur->nr_phys_segments;
1682
1683         if (rq_data_dir(cur) == WRITE) {
1684                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1685                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1686         }
1687
1688         do {
1689                 if (reqs >= max_packed_rw - 1) {
1690                         put_back = false;
1691                         break;
1692                 }
1693
1694                 spin_lock_irq(q->queue_lock);
1695                 next = blk_fetch_request(q);
1696                 spin_unlock_irq(q->queue_lock);
1697                 if (!next) {
1698                         put_back = false;
1699                         break;
1700                 }
1701
1702                 if (mmc_large_sector(card) &&
1703                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1704                         break;
1705
1706                 if (next->cmd_flags & REQ_DISCARD ||
1707                     next->cmd_flags & REQ_FLUSH)
1708                         break;
1709
1710                 if (rq_data_dir(cur) != rq_data_dir(next))
1711                         break;
1712
1713                 if (mmc_req_rel_wr(next) &&
1714                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1715                         break;
1716
1717                 req_sectors += blk_rq_sectors(next);
1718                 if (req_sectors > max_blk_count)
1719                         break;
1720
1721                 phys_segments +=  next->nr_phys_segments;
1722                 if (phys_segments > max_phys_segs)
1723                         break;
1724
1725                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1726                 cur = next;
1727                 reqs++;
1728         } while (1);
1729
1730         if (put_back) {
1731                 spin_lock_irq(q->queue_lock);
1732                 blk_requeue_request(q, next);
1733                 spin_unlock_irq(q->queue_lock);
1734         }
1735
1736         if (reqs > 0) {
1737                 list_add(&req->queuelist, &mqrq->packed->list);
1738                 mqrq->packed->nr_entries = ++reqs;
1739                 mqrq->packed->retries = reqs;
1740                 return reqs;
1741         }
1742
1743 no_packed:
1744         mqrq->cmd_type = MMC_PACKED_NONE;
1745         return 0;
1746 }
1747
1748 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1749                                         struct mmc_card *card,
1750                                         struct mmc_queue *mq)
1751 {
1752         struct mmc_blk_request *brq = &mqrq->brq;
1753         struct request *req = mqrq->req;
1754         struct request *prq;
1755         struct mmc_blk_data *md = mq->data;
1756         struct mmc_packed *packed = mqrq->packed;
1757         bool do_rel_wr, do_data_tag;
1758         __le32 *packed_cmd_hdr;
1759         u8 hdr_blocks;
1760         u8 i = 1;
1761
1762         BUG_ON(!packed);
1763
1764         mqrq->cmd_type = MMC_PACKED_WRITE;
1765         packed->blocks = 0;
1766         packed->idx_failure = MMC_PACKED_NR_IDX;
1767
1768         packed_cmd_hdr = packed->cmd_hdr;
1769         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1770         packed_cmd_hdr[0] = cpu_to_le32((packed->nr_entries << 16) |
1771                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER);
1772         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1773
1774         /*
1775          * Argument for each entry of packed group
1776          */
1777         list_for_each_entry(prq, &packed->list, queuelist) {
1778                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1779                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1780                         (prq->cmd_flags & REQ_META) &&
1781                         (rq_data_dir(prq) == WRITE) &&
1782                         ((brq->data.blocks * brq->data.blksz) >=
1783                          card->ext_csd.data_tag_unit_size);
1784                 /* Argument of CMD23 */
1785                 packed_cmd_hdr[(i * 2)] = cpu_to_le32(
1786                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1787                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1788                         blk_rq_sectors(prq));
1789                 /* Argument of CMD18 or CMD25 */
1790                 packed_cmd_hdr[((i * 2)) + 1] = cpu_to_le32(
1791                         mmc_card_blockaddr(card) ?
1792                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9);
1793                 packed->blocks += blk_rq_sectors(prq);
1794                 i++;
1795         }
1796
1797         memset(brq, 0, sizeof(struct mmc_blk_request));
1798         brq->mrq.cmd = &brq->cmd;
1799         brq->mrq.data = &brq->data;
1800         brq->mrq.sbc = &brq->sbc;
1801         brq->mrq.stop = &brq->stop;
1802
1803         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1804         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1805         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1806
1807         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1808         brq->cmd.arg = blk_rq_pos(req);
1809         if (!mmc_card_blockaddr(card))
1810                 brq->cmd.arg <<= 9;
1811         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1812
1813         brq->data.blksz = 512;
1814         brq->data.blocks = packed->blocks + hdr_blocks;
1815         brq->data.flags |= MMC_DATA_WRITE;
1816
1817         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1818         brq->stop.arg = 0;
1819         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1820
1821         mmc_set_data_timeout(&brq->data, card);
1822
1823         brq->data.sg = mqrq->sg;
1824         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1825
1826         mqrq->mmc_active.mrq = &brq->mrq;
1827         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1828
1829         mmc_queue_bounce_pre(mqrq);
1830 }
1831
1832 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1833                            struct mmc_blk_request *brq, struct request *req,
1834                            int ret)
1835 {
1836         struct mmc_queue_req *mq_rq;
1837         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1838
1839         /*
1840          * If this is an SD card and we're writing, we can first
1841          * mark the known good sectors as ok.
1842          *
1843          * If the card is not SD, we can still ok written sectors
1844          * as reported by the controller (which might be less than
1845          * the real number of written sectors, but never more).
1846          */
1847         if (mmc_card_sd(card)) {
1848                 u32 blocks;
1849
1850                 blocks = mmc_sd_num_wr_blocks(card);
1851                 if (blocks != (u32)-1) {
1852                         ret = blk_end_request(req, 0, blocks << 9);
1853                 }
1854         } else {
1855                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1856                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1857         }
1858         return ret;
1859 }
1860
1861 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1862 {
1863         struct request *prq;
1864         struct mmc_packed *packed = mq_rq->packed;
1865         int idx = packed->idx_failure, i = 0;
1866         int ret = 0;
1867
1868         BUG_ON(!packed);
1869
1870         while (!list_empty(&packed->list)) {
1871                 prq = list_entry_rq(packed->list.next);
1872                 if (idx == i) {
1873                         /* retry from error index */
1874                         packed->nr_entries -= idx;
1875                         mq_rq->req = prq;
1876                         ret = 1;
1877
1878                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1879                                 list_del_init(&prq->queuelist);
1880                                 mmc_blk_clear_packed(mq_rq);
1881                         }
1882                         return ret;
1883                 }
1884                 list_del_init(&prq->queuelist);
1885                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1886                 i++;
1887         }
1888
1889         mmc_blk_clear_packed(mq_rq);
1890         return ret;
1891 }
1892
1893 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1894 {
1895         struct request *prq;
1896         struct mmc_packed *packed = mq_rq->packed;
1897
1898         BUG_ON(!packed);
1899
1900         while (!list_empty(&packed->list)) {
1901                 prq = list_entry_rq(packed->list.next);
1902                 list_del_init(&prq->queuelist);
1903                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1904         }
1905
1906         mmc_blk_clear_packed(mq_rq);
1907 }
1908
1909 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1910                                       struct mmc_queue_req *mq_rq)
1911 {
1912         struct request *prq;
1913         struct request_queue *q = mq->queue;
1914         struct mmc_packed *packed = mq_rq->packed;
1915
1916         BUG_ON(!packed);
1917
1918         while (!list_empty(&packed->list)) {
1919                 prq = list_entry_rq(packed->list.prev);
1920                 if (prq->queuelist.prev != &packed->list) {
1921                         list_del_init(&prq->queuelist);
1922                         spin_lock_irq(q->queue_lock);
1923                         blk_requeue_request(mq->queue, prq);
1924                         spin_unlock_irq(q->queue_lock);
1925                 } else {
1926                         list_del_init(&prq->queuelist);
1927                 }
1928         }
1929
1930         mmc_blk_clear_packed(mq_rq);
1931 }
1932
1933 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1934 {
1935         struct mmc_blk_data *md = mq->data;
1936         struct mmc_card *card = md->queue.card;
1937         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1938         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1939         enum mmc_blk_status status;
1940         struct mmc_queue_req *mq_rq;
1941         struct request *req = rqc;
1942         struct mmc_async_req *areq;
1943         const u8 packed_nr = 2;
1944         u8 reqs = 0;
1945
1946         if (!rqc && !mq->mqrq_prev->req)
1947                 return 0;
1948
1949         if (rqc)
1950                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1951
1952         do {
1953                 if (rqc) {
1954                         /*
1955                          * When 4KB native sector is enabled, only 8 blocks
1956                          * multiple read or write is allowed
1957                          */
1958                         if ((brq->data.blocks & 0x07) &&
1959                             (card->ext_csd.data_sector_size == 4096)) {
1960                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1961                                         req->rq_disk->disk_name);
1962                                 mq_rq = mq->mqrq_cur;
1963                                 goto cmd_abort;
1964                         }
1965
1966                         if (reqs >= packed_nr)
1967                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1968                                                             card, mq);
1969                         else
1970                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1971                         areq = &mq->mqrq_cur->mmc_active;
1972                 } else
1973                         areq = NULL;
1974                 areq = mmc_start_req(card->host, areq, (int *) &status);
1975                 if (!areq) {
1976                         if (status == MMC_BLK_NEW_REQUEST)
1977                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1978                         return 0;
1979                 }
1980
1981                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1982                 brq = &mq_rq->brq;
1983                 req = mq_rq->req;
1984                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1985                 mmc_queue_bounce_post(mq_rq);
1986
1987                 switch (status) {
1988                 case MMC_BLK_SUCCESS:
1989                 case MMC_BLK_PARTIAL:
1990                         /*
1991                          * A block was successfully transferred.
1992                          */
1993                         mmc_blk_reset_success(md, type);
1994
1995                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1996                                 ret = mmc_blk_end_packed_req(mq_rq);
1997                                 break;
1998                         } else {
1999                                 ret = blk_end_request(req, 0,
2000                                                 brq->data.bytes_xfered);
2001                         }
2002
2003                         /*
2004                          * If the blk_end_request function returns non-zero even
2005                          * though all data has been transferred and no errors
2006                          * were returned by the host controller, it's a bug.
2007                          */
2008                         if (status == MMC_BLK_SUCCESS && ret) {
2009                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2010                                        __func__, blk_rq_bytes(req),
2011                                        brq->data.bytes_xfered);
2012                                 rqc = NULL;
2013                                 goto cmd_abort;
2014                         }
2015                         break;
2016                 case MMC_BLK_CMD_ERR:
2017                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2018                         if (mmc_blk_reset(md, card->host, type))
2019                                 goto cmd_abort;
2020                         if (!ret)
2021                                 goto start_new_req;
2022                         break;
2023                 case MMC_BLK_RETRY:
2024                         retune_retry_done = brq->retune_retry_done;
2025                         if (retry++ < 5)
2026                                 break;
2027                         /* Fall through */
2028                 case MMC_BLK_ABORT:
2029                         if (!mmc_blk_reset(md, card->host, type))
2030                                 break;
2031                         goto cmd_abort;
2032                 case MMC_BLK_DATA_ERR: {
2033                         int err;
2034
2035                         err = mmc_blk_reset(md, card->host, type);
2036                         if (!err)
2037                                 break;
2038                         if (err == -ENODEV ||
2039                                 mmc_packed_cmd(mq_rq->cmd_type))
2040                                 goto cmd_abort;
2041                         /* Fall through */
2042                 }
2043                 case MMC_BLK_ECC_ERR:
2044                         if (brq->data.blocks > 1) {
2045                                 /* Redo read one sector at a time */
2046                                 pr_warn("%s: retrying using single block read\n",
2047                                         req->rq_disk->disk_name);
2048                                 disable_multi = 1;
2049                                 break;
2050                         }
2051                         /*
2052                          * After an error, we redo I/O one sector at a
2053                          * time, so we only reach here after trying to
2054                          * read a single sector.
2055                          */
2056                         ret = blk_end_request(req, -EIO,
2057                                                 brq->data.blksz);
2058                         if (!ret)
2059                                 goto start_new_req;
2060                         break;
2061                 case MMC_BLK_NOMEDIUM:
2062                         goto cmd_abort;
2063                 default:
2064                         pr_err("%s: Unhandled return value (%d)",
2065                                         req->rq_disk->disk_name, status);
2066                         goto cmd_abort;
2067                 }
2068
2069                 if (ret) {
2070                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2071                                 if (!mq_rq->packed->retries)
2072                                         goto cmd_abort;
2073                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2074                                 mmc_start_req(card->host,
2075                                               &mq_rq->mmc_active, NULL);
2076                         } else {
2077
2078                                 /*
2079                                  * In case of a incomplete request
2080                                  * prepare it again and resend.
2081                                  */
2082                                 mmc_blk_rw_rq_prep(mq_rq, card,
2083                                                 disable_multi, mq);
2084                                 mmc_start_req(card->host,
2085                                                 &mq_rq->mmc_active, NULL);
2086                         }
2087                         mq_rq->brq.retune_retry_done = retune_retry_done;
2088                 }
2089         } while (ret);
2090
2091         return 1;
2092
2093  cmd_abort:
2094         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2095                 mmc_blk_abort_packed_req(mq_rq);
2096         } else {
2097                 if (mmc_card_removed(card))
2098                         req->cmd_flags |= REQ_QUIET;
2099                 while (ret)
2100                         ret = blk_end_request(req, -EIO,
2101                                         blk_rq_cur_bytes(req));
2102         }
2103
2104  start_new_req:
2105         if (rqc) {
2106                 if (mmc_card_removed(card)) {
2107                         rqc->cmd_flags |= REQ_QUIET;
2108                         blk_end_request_all(rqc, -EIO);
2109                 } else {
2110                         /*
2111                          * If current request is packed, it needs to put back.
2112                          */
2113                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2114                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2115
2116                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2117                         mmc_start_req(card->host,
2118                                       &mq->mqrq_cur->mmc_active, NULL);
2119                 }
2120         }
2121
2122         return 0;
2123 }
2124
2125 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2126 {
2127         int ret;
2128         struct mmc_blk_data *md = mq->data;
2129         struct mmc_card *card = md->queue.card;
2130         struct mmc_host *host = card->host;
2131         unsigned long flags;
2132         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2133
2134         if (req && !mq->mqrq_prev->req)
2135                 /* claim host only for the first request */
2136                 mmc_get_card(card);
2137
2138         ret = mmc_blk_part_switch(card, md);
2139         if (ret) {
2140                 if (req) {
2141                         blk_end_request_all(req, -EIO);
2142                 }
2143                 ret = 0;
2144                 goto out;
2145         }
2146
2147         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2148         if (cmd_flags & REQ_DISCARD) {
2149                 /* complete ongoing async transfer before issuing discard */
2150                 if (card->host->areq)
2151                         mmc_blk_issue_rw_rq(mq, NULL);
2152                 if (req->cmd_flags & REQ_SECURE)
2153                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2154                 else
2155                         ret = mmc_blk_issue_discard_rq(mq, req);
2156         } else if (cmd_flags & REQ_FLUSH) {
2157                 /* complete ongoing async transfer before issuing flush */
2158                 if (card->host->areq)
2159                         mmc_blk_issue_rw_rq(mq, NULL);
2160                 ret = mmc_blk_issue_flush(mq, req);
2161         } else {
2162                 if (!req && host->areq) {
2163                         spin_lock_irqsave(&host->context_info.lock, flags);
2164                         host->context_info.is_waiting_last_req = true;
2165                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2166                 }
2167                 ret = mmc_blk_issue_rw_rq(mq, req);
2168         }
2169
2170 out:
2171         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2172              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2173                 /*
2174                  * Release host when there are no more requests
2175                  * and after special request(discard, flush) is done.
2176                  * In case sepecial request, there is no reentry to
2177                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2178                  */
2179                 mmc_put_card(card);
2180         return ret;
2181 }
2182
2183 static inline int mmc_blk_readonly(struct mmc_card *card)
2184 {
2185         return mmc_card_readonly(card) ||
2186                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2187 }
2188
2189 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2190                                               struct device *parent,
2191                                               sector_t size,
2192                                               bool default_ro,
2193                                               const char *subname,
2194                                               int area_type)
2195 {
2196         struct mmc_blk_data *md;
2197         int devidx, ret;
2198
2199         devidx = find_first_zero_bit(dev_use, max_devices);
2200         if (devidx >= max_devices)
2201                 return ERR_PTR(-ENOSPC);
2202         __set_bit(devidx, dev_use);
2203
2204         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2205         if (!md) {
2206                 ret = -ENOMEM;
2207                 goto out;
2208         }
2209
2210         /*
2211          * !subname implies we are creating main mmc_blk_data that will be
2212          * associated with mmc_card with dev_set_drvdata. Due to device
2213          * partitions, devidx will not coincide with a per-physical card
2214          * index anymore so we keep track of a name index.
2215          */
2216         if (!subname) {
2217                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2218                 __set_bit(md->name_idx, name_use);
2219         } else
2220                 md->name_idx = ((struct mmc_blk_data *)
2221                                 dev_to_disk(parent)->private_data)->name_idx;
2222
2223         md->area_type = area_type;
2224
2225         /*
2226          * Set the read-only status based on the supported commands
2227          * and the write protect switch.
2228          */
2229         md->read_only = mmc_blk_readonly(card);
2230
2231         md->disk = alloc_disk(perdev_minors);
2232         if (md->disk == NULL) {
2233                 ret = -ENOMEM;
2234                 goto err_kfree;
2235         }
2236
2237         spin_lock_init(&md->lock);
2238         INIT_LIST_HEAD(&md->part);
2239         md->usage = 1;
2240
2241         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2242         if (ret)
2243                 goto err_putdisk;
2244
2245         md->queue.issue_fn = mmc_blk_issue_rq;
2246         md->queue.data = md;
2247
2248         md->disk->major = MMC_BLOCK_MAJOR;
2249         md->disk->first_minor = devidx * perdev_minors;
2250         md->disk->fops = &mmc_bdops;
2251         md->disk->private_data = md;
2252         md->disk->queue = md->queue.queue;
2253         md->disk->driverfs_dev = parent;
2254         set_disk_ro(md->disk, md->read_only || default_ro);
2255         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2256                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2257
2258         /*
2259          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2260          *
2261          * - be set for removable media with permanent block devices
2262          * - be unset for removable block devices with permanent media
2263          *
2264          * Since MMC block devices clearly fall under the second
2265          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2266          * should use the block device creation/destruction hotplug
2267          * messages to tell when the card is present.
2268          */
2269
2270         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2271                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2272
2273         if (mmc_card_mmc(card))
2274                 blk_queue_logical_block_size(md->queue.queue,
2275                                              card->ext_csd.data_sector_size);
2276         else
2277                 blk_queue_logical_block_size(md->queue.queue, 512);
2278
2279         set_capacity(md->disk, size);
2280
2281         if (mmc_host_cmd23(card->host)) {
2282                 if ((mmc_card_mmc(card) &&
2283                      card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2284                     (mmc_card_sd(card) &&
2285                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2286                         md->flags |= MMC_BLK_CMD23;
2287         }
2288
2289         if (mmc_card_mmc(card) &&
2290             md->flags & MMC_BLK_CMD23 &&
2291             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2292              card->ext_csd.rel_sectors)) {
2293                 md->flags |= MMC_BLK_REL_WR;
2294                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2295         }
2296
2297         if (mmc_card_mmc(card) &&
2298             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2299             (md->flags & MMC_BLK_CMD23) &&
2300             card->ext_csd.packed_event_en) {
2301                 if (!mmc_packed_init(&md->queue, card))
2302                         md->flags |= MMC_BLK_PACKED_CMD;
2303         }
2304
2305         return md;
2306
2307  err_putdisk:
2308         put_disk(md->disk);
2309  err_kfree:
2310         kfree(md);
2311  out:
2312         return ERR_PTR(ret);
2313 }
2314
2315 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2316 {
2317         sector_t size;
2318
2319         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2320                 /*
2321                  * The EXT_CSD sector count is in number or 512 byte
2322                  * sectors.
2323                  */
2324                 size = card->ext_csd.sectors;
2325         } else {
2326                 /*
2327                  * The CSD capacity field is in units of read_blkbits.
2328                  * set_capacity takes units of 512 bytes.
2329                  */
2330                 size = (typeof(sector_t))card->csd.capacity
2331                         << (card->csd.read_blkbits - 9);
2332         }
2333
2334         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2335                                         MMC_BLK_DATA_AREA_MAIN);
2336 }
2337
2338 static int mmc_blk_alloc_part(struct mmc_card *card,
2339                               struct mmc_blk_data *md,
2340                               unsigned int part_type,
2341                               sector_t size,
2342                               bool default_ro,
2343                               const char *subname,
2344                               int area_type)
2345 {
2346         char cap_str[10];
2347         struct mmc_blk_data *part_md;
2348
2349         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2350                                     subname, area_type);
2351         if (IS_ERR(part_md))
2352                 return PTR_ERR(part_md);
2353         part_md->part_type = part_type;
2354         list_add(&part_md->part, &md->part);
2355
2356         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2357                         cap_str, sizeof(cap_str));
2358         pr_info("%s: %s %s partition %u %s\n",
2359                part_md->disk->disk_name, mmc_card_id(card),
2360                mmc_card_name(card), part_md->part_type, cap_str);
2361         return 0;
2362 }
2363
2364 /* MMC Physical partitions consist of two boot partitions and
2365  * up to four general purpose partitions.
2366  * For each partition enabled in EXT_CSD a block device will be allocatedi
2367  * to provide access to the partition.
2368  */
2369
2370 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2371 {
2372         int idx, ret = 0;
2373
2374         if (!mmc_card_mmc(card))
2375                 return 0;
2376
2377         for (idx = 0; idx < card->nr_parts; idx++) {
2378                 if (card->part[idx].size) {
2379                         ret = mmc_blk_alloc_part(card, md,
2380                                 card->part[idx].part_cfg,
2381                                 card->part[idx].size >> 9,
2382                                 card->part[idx].force_ro,
2383                                 card->part[idx].name,
2384                                 card->part[idx].area_type);
2385                         if (ret)
2386                                 return ret;
2387                 }
2388         }
2389
2390         return ret;
2391 }
2392
2393 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2394 {
2395         struct mmc_card *card;
2396
2397         if (md) {
2398                 /*
2399                  * Flush remaining requests and free queues. It
2400                  * is freeing the queue that stops new requests
2401                  * from being accepted.
2402                  */
2403                 card = md->queue.card;
2404                 mmc_cleanup_queue(&md->queue);
2405                 if (md->flags & MMC_BLK_PACKED_CMD)
2406                         mmc_packed_clean(&md->queue);
2407                 if (md->disk->flags & GENHD_FL_UP) {
2408                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2409                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2410                                         card->ext_csd.boot_ro_lockable)
2411                                 device_remove_file(disk_to_dev(md->disk),
2412                                         &md->power_ro_lock);
2413
2414                         del_gendisk(md->disk);
2415                 }
2416                 mmc_blk_put(md);
2417         }
2418 }
2419
2420 static void mmc_blk_remove_parts(struct mmc_card *card,
2421                                  struct mmc_blk_data *md)
2422 {
2423         struct list_head *pos, *q;
2424         struct mmc_blk_data *part_md;
2425
2426         __clear_bit(md->name_idx, name_use);
2427         list_for_each_safe(pos, q, &md->part) {
2428                 part_md = list_entry(pos, struct mmc_blk_data, part);
2429                 list_del(pos);
2430                 mmc_blk_remove_req(part_md);
2431         }
2432 }
2433
2434 static int mmc_add_disk(struct mmc_blk_data *md)
2435 {
2436         int ret;
2437         struct mmc_card *card = md->queue.card;
2438
2439         add_disk(md->disk);
2440         md->force_ro.show = force_ro_show;
2441         md->force_ro.store = force_ro_store;
2442         sysfs_attr_init(&md->force_ro.attr);
2443         md->force_ro.attr.name = "force_ro";
2444         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2445         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2446         if (ret)
2447                 goto force_ro_fail;
2448
2449         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2450              card->ext_csd.boot_ro_lockable) {
2451                 umode_t mode;
2452
2453                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2454                         mode = S_IRUGO;
2455                 else
2456                         mode = S_IRUGO | S_IWUSR;
2457
2458                 md->power_ro_lock.show = power_ro_lock_show;
2459                 md->power_ro_lock.store = power_ro_lock_store;
2460                 sysfs_attr_init(&md->power_ro_lock.attr);
2461                 md->power_ro_lock.attr.mode = mode;
2462                 md->power_ro_lock.attr.name =
2463                                         "ro_lock_until_next_power_on";
2464                 ret = device_create_file(disk_to_dev(md->disk),
2465                                 &md->power_ro_lock);
2466                 if (ret)
2467                         goto power_ro_lock_fail;
2468         }
2469         return ret;
2470
2471 power_ro_lock_fail:
2472         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2473 force_ro_fail:
2474         del_gendisk(md->disk);
2475
2476         return ret;
2477 }
2478
2479 #define CID_MANFID_SANDISK      0x2
2480 #define CID_MANFID_TOSHIBA      0x11
2481 #define CID_MANFID_MICRON       0x13
2482 #define CID_MANFID_SAMSUNG      0x15
2483 #define CID_MANFID_KINGSTON     0x70
2484
2485 static const struct mmc_fixup blk_fixups[] =
2486 {
2487         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2488                   MMC_QUIRK_INAND_CMD38),
2489         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2490                   MMC_QUIRK_INAND_CMD38),
2491         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2492                   MMC_QUIRK_INAND_CMD38),
2493         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2494                   MMC_QUIRK_INAND_CMD38),
2495         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2496                   MMC_QUIRK_INAND_CMD38),
2497
2498         /*
2499          * Some MMC cards experience performance degradation with CMD23
2500          * instead of CMD12-bounded multiblock transfers. For now we'll
2501          * black list what's bad...
2502          * - Certain Toshiba cards.
2503          *
2504          * N.B. This doesn't affect SD cards.
2505          */
2506         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2507                   MMC_QUIRK_BLK_NO_CMD23),
2508         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2509                   MMC_QUIRK_BLK_NO_CMD23),
2510         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2511                   MMC_QUIRK_BLK_NO_CMD23),
2512         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2513                   MMC_QUIRK_BLK_NO_CMD23),
2514         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2515                   MMC_QUIRK_BLK_NO_CMD23),
2516
2517         /*
2518          * Some MMC cards need longer data read timeout than indicated in CSD.
2519          */
2520         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2521                   MMC_QUIRK_LONG_READ_TIME),
2522         MMC_FIXUP("008GE0", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2523                   MMC_QUIRK_LONG_READ_TIME),
2524
2525         /*
2526          * On these Samsung MoviNAND parts, performing secure erase or
2527          * secure trim can result in unrecoverable corruption due to a
2528          * firmware bug.
2529          */
2530         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2531                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2532         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2533                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2534         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2535                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2536         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2537                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2538         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2539                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2540         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2541                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2542         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2543                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2544         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2545                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2546
2547         /*
2548          *  On Some Kingston eMMCs, performing trim can result in
2549          *  unrecoverable data conrruption occasionally due to a firmware bug.
2550          */
2551         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2552                   MMC_QUIRK_TRIM_BROKEN),
2553         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2554                   MMC_QUIRK_TRIM_BROKEN),
2555
2556         END_FIXUP
2557 };
2558
2559 static int mmc_blk_probe(struct mmc_card *card)
2560 {
2561         struct mmc_blk_data *md, *part_md;
2562         char cap_str[10];
2563
2564         /*
2565          * Check that the card supports the command class(es) we need.
2566          */
2567         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2568                 return -ENODEV;
2569
2570         mmc_fixup_device(card, blk_fixups);
2571
2572         md = mmc_blk_alloc(card);
2573         if (IS_ERR(md))
2574                 return PTR_ERR(md);
2575
2576         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2577                         cap_str, sizeof(cap_str));
2578         pr_info("%s: %s %s %s %s\n",
2579                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2580                 cap_str, md->read_only ? "(ro)" : "");
2581
2582         if (mmc_blk_alloc_parts(card, md))
2583                 goto out;
2584
2585         dev_set_drvdata(&card->dev, md);
2586
2587         if (mmc_add_disk(md))
2588                 goto out;
2589
2590         list_for_each_entry(part_md, &md->part, part) {
2591                 if (mmc_add_disk(part_md))
2592                         goto out;
2593         }
2594
2595         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2596         pm_runtime_use_autosuspend(&card->dev);
2597
2598         /*
2599          * Don't enable runtime PM for SD-combo cards here. Leave that
2600          * decision to be taken during the SDIO init sequence instead.
2601          */
2602         if (card->type != MMC_TYPE_SD_COMBO) {
2603                 pm_runtime_set_active(&card->dev);
2604                 pm_runtime_enable(&card->dev);
2605         }
2606
2607         return 0;
2608
2609  out:
2610         mmc_blk_remove_parts(card, md);
2611         mmc_blk_remove_req(md);
2612         return 0;
2613 }
2614
2615 static void mmc_blk_remove(struct mmc_card *card)
2616 {
2617         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2618
2619         mmc_blk_remove_parts(card, md);
2620         pm_runtime_get_sync(&card->dev);
2621         mmc_claim_host(card->host);
2622         mmc_blk_part_switch(card, md);
2623         mmc_release_host(card->host);
2624         if (card->type != MMC_TYPE_SD_COMBO)
2625                 pm_runtime_disable(&card->dev);
2626         pm_runtime_put_noidle(&card->dev);
2627         mmc_blk_remove_req(md);
2628         dev_set_drvdata(&card->dev, NULL);
2629 }
2630
2631 static int _mmc_blk_suspend(struct mmc_card *card)
2632 {
2633         struct mmc_blk_data *part_md;
2634         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2635
2636         if (md) {
2637                 mmc_queue_suspend(&md->queue);
2638                 list_for_each_entry(part_md, &md->part, part) {
2639                         mmc_queue_suspend(&part_md->queue);
2640                 }
2641         }
2642         return 0;
2643 }
2644
2645 static void mmc_blk_shutdown(struct mmc_card *card)
2646 {
2647         _mmc_blk_suspend(card);
2648 }
2649
2650 #ifdef CONFIG_PM_SLEEP
2651 static int mmc_blk_suspend(struct device *dev)
2652 {
2653         struct mmc_card *card = mmc_dev_to_card(dev);
2654
2655         return _mmc_blk_suspend(card);
2656 }
2657
2658 static int mmc_blk_resume(struct device *dev)
2659 {
2660         struct mmc_blk_data *part_md;
2661         struct mmc_blk_data *md = dev_get_drvdata(dev);
2662
2663         if (md) {
2664                 /*
2665                  * Resume involves the card going into idle state,
2666                  * so current partition is always the main one.
2667                  */
2668                 md->part_curr = md->part_type;
2669                 mmc_queue_resume(&md->queue);
2670                 list_for_each_entry(part_md, &md->part, part) {
2671                         mmc_queue_resume(&part_md->queue);
2672                 }
2673         }
2674         return 0;
2675 }
2676 #endif
2677
2678 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2679
2680 static struct mmc_driver mmc_driver = {
2681         .drv            = {
2682                 .name   = "mmcblk",
2683                 .pm     = &mmc_blk_pm_ops,
2684         },
2685         .probe          = mmc_blk_probe,
2686         .remove         = mmc_blk_remove,
2687         .shutdown       = mmc_blk_shutdown,
2688 };
2689
2690 static int __init mmc_blk_init(void)
2691 {
2692         int res;
2693
2694         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2695                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2696
2697         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2698
2699         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2700         if (res)
2701                 goto out;
2702
2703         res = mmc_register_driver(&mmc_driver);
2704         if (res)
2705                 goto out2;
2706
2707         return 0;
2708  out2:
2709         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2710  out:
2711         return res;
2712 }
2713
2714 static void __exit mmc_blk_exit(void)
2715 {
2716         mmc_unregister_driver(&mmc_driver);
2717         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2718 }
2719
2720 module_init(mmc_blk_init);
2721 module_exit(mmc_blk_exit);
2722
2723 MODULE_LICENSE("GPL");
2724 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2725