kernel/drivers/mmc/card/block.c

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