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                 /* Re-tune if needed */
 917                 mmc_retune_recheck(card->host);
 918
 919                 prev_cmd_status_valid = false;
 920                 pr_err("%s: error %d sending status command, %sing\n",
 921                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 922         }
 923
 924         /* We couldn't get a response from the card.  Give up. */
 925         if (err) {
 926                 /* Check if the card is removed */
 927                 if (mmc_detect_card_removed(card->host))
 928                         return ERR_NOMEDIUM;
 929                 return ERR_ABORT;
 930         }
 931
 932         /* Flag ECC errors */
 933         if ((status & R1_CARD_ECC_FAILED) ||
 934             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 935             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 936                 *ecc_err = 1;
 937
 938         /* Flag General errors */
 939         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 940                 if ((status & R1_ERROR) ||
 941                         (brq->stop.resp[0] & R1_ERROR)) {
 942                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 943                                req->rq_disk->disk_name, __func__,
 944                                brq->stop.resp[0], status);
 945                         *gen_err = 1;
 946                 }
 947
 948         /*
 949          * Check the current card state.  If it is in some data transfer
 950          * mode, tell it to stop (and hopefully transition back to TRAN.)
 951          */
 952         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 953             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 954                 err = send_stop(card,
 955                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
 956                         req, gen_err, &stop_status);
 957                 if (err) {
 958                         pr_err("%s: error %d sending stop command\n",
 959                                req->rq_disk->disk_name, err);
 960                         /*
 961                          * If the stop cmd also timed out, the card is probably
 962                          * not present, so abort. Other errors are bad news too.
 963                          */
 964                         return ERR_ABORT;
 965                 }
 966
 967                 if (stop_status & R1_CARD_ECC_FAILED)
 968                         *ecc_err = 1;
 969         }
 970
 971         /* Check for set block count errors */
 972         if (brq->sbc.error)
 973                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 974                                 prev_cmd_status_valid, status);
 975
 976         /* Check for r/w command errors */
 977         if (brq->cmd.error)
 978                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 979                                 prev_cmd_status_valid, status);
 980
 981         /* Data errors */
 982         if (!brq->stop.error)
 983                 return ERR_CONTINUE;
 984
 985         /* Now for stop errors.  These aren't fatal to the transfer. */
 986         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 987                req->rq_disk->disk_name, brq->stop.error,
 988                brq->cmd.resp[0], status);
 989
 990         /*
 991          * Subsitute in our own stop status as this will give the error
 992          * state which happened during the execution of the r/w command.
 993          */
 994         if (stop_status) {
 995                 brq->stop.resp[0] = stop_status;
 996                 brq->stop.error = 0;
 997         }
 998         return ERR_CONTINUE;
 999 }
1000
1001 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1002                          int type)
1003 {
1004         int err;
1005
1006         if (md->reset_done & type)
1007                 return -EEXIST;
1008
1009         md->reset_done |= type;
1010         err = mmc_hw_reset(host);
1011         /* Ensure we switch back to the correct partition */
1012         if (err != -EOPNOTSUPP) {
1013                 struct mmc_blk_data *main_md =
1014                         dev_get_drvdata(&host->card->dev);
1015                 int part_err;
1016
1017                 main_md->part_curr = main_md->part_type;
1018                 part_err = mmc_blk_part_switch(host->card, md);
1019                 if (part_err) {
1020                         /*
1021                          * We have failed to get back into the correct
1022                          * partition, so we need to abort the whole request.
1023                          */
1024                         return -ENODEV;
1025                 }
1026         }
1027         return err;
1028 }
1029
1030 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1031 {
1032         md->reset_done &= ~type;
1033 }
1034
1035 int mmc_access_rpmb(struct mmc_queue *mq)
1036 {
1037         struct mmc_blk_data *md = mq->data;
1038         /*
1039          * If this is a RPMB partition access, return ture
1040          */
1041         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1042                 return true;
1043
1044         return false;
1045 }
1046
1047 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1048 {
1049         struct mmc_blk_data *md = mq->data;
1050         struct mmc_card *card = md->queue.card;
1051         unsigned int from, nr, arg;
1052         int err = 0, type = MMC_BLK_DISCARD;
1053
1054         if (!mmc_can_erase(card)) {
1055                 err = -EOPNOTSUPP;
1056                 goto out;
1057         }
1058
1059         from = blk_rq_pos(req);
1060         nr = blk_rq_sectors(req);
1061
1062         if (mmc_can_discard(card))
1063                 arg = MMC_DISCARD_ARG;
1064         else if (mmc_can_trim(card))
1065                 arg = MMC_TRIM_ARG;
1066         else
1067                 arg = MMC_ERASE_ARG;
1068 retry:
1069         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1070                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1071                                  INAND_CMD38_ARG_EXT_CSD,
1072                                  arg == MMC_TRIM_ARG ?
1073                                  INAND_CMD38_ARG_TRIM :
1074                                  INAND_CMD38_ARG_ERASE,
1075                                  0);
1076                 if (err)
1077                         goto out;
1078         }
1079         err = mmc_erase(card, from, nr, arg);
1080 out:
1081         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1082                 goto retry;
1083         if (!err)
1084                 mmc_blk_reset_success(md, type);
1085         blk_end_request(req, err, blk_rq_bytes(req));
1086
1087         return err ? 0 : 1;
1088 }
1089
1090 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1091                                        struct request *req)
1092 {
1093         struct mmc_blk_data *md = mq->data;
1094         struct mmc_card *card = md->queue.card;
1095         unsigned int from, nr, arg;
1096         int err = 0, type = MMC_BLK_SECDISCARD;
1097
1098         if (!(mmc_can_secure_erase_trim(card))) {
1099                 err = -EOPNOTSUPP;
1100                 goto out;
1101         }
1102
1103         from = blk_rq_pos(req);
1104         nr = blk_rq_sectors(req);
1105
1106         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1107                 arg = MMC_SECURE_TRIM1_ARG;
1108         else
1109                 arg = MMC_SECURE_ERASE_ARG;
1110
1111 retry:
1112         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1113                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1114                                  INAND_CMD38_ARG_EXT_CSD,
1115                                  arg == MMC_SECURE_TRIM1_ARG ?
1116                                  INAND_CMD38_ARG_SECTRIM1 :
1117                                  INAND_CMD38_ARG_SECERASE,
1118                                  0);
1119                 if (err)
1120                         goto out_retry;
1121         }
1122
1123         err = mmc_erase(card, from, nr, arg);
1124         if (err == -EIO)
1125                 goto out_retry;
1126         if (err)
1127                 goto out;
1128
1129         if (arg == MMC_SECURE_TRIM1_ARG) {
1130                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1131                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1132                                          INAND_CMD38_ARG_EXT_CSD,
1133                                          INAND_CMD38_ARG_SECTRIM2,
1134                                          0);
1135                         if (err)
1136                                 goto out_retry;
1137                 }
1138
1139                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1140                 if (err == -EIO)
1141                         goto out_retry;
1142                 if (err)
1143                         goto out;
1144         }
1145
1146 out_retry:
1147         if (err && !mmc_blk_reset(md, card->host, type))
1148                 goto retry;
1149         if (!err)
1150                 mmc_blk_reset_success(md, type);
1151 out:
1152         blk_end_request(req, err, blk_rq_bytes(req));
1153
1154         return err ? 0 : 1;
1155 }
1156
1157 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1158 {
1159         struct mmc_blk_data *md = mq->data;
1160         struct mmc_card *card = md->queue.card;
1161         int ret = 0;
1162
1163         ret = mmc_flush_cache(card);
1164         if (ret)
1165                 ret = -EIO;
1166
1167         blk_end_request_all(req, ret);
1168
1169         return ret ? 0 : 1;
1170 }
1171
1172 /*
1173  * Reformat current write as a reliable write, supporting
1174  * both legacy and the enhanced reliable write MMC cards.
1175  * In each transfer we'll handle only as much as a single
1176  * reliable write can handle, thus finish the request in
1177  * partial completions.
1178  */
1179 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1180                                     struct mmc_card *card,
1181                                     struct request *req)
1182 {
1183         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1184                 /* Legacy mode imposes restrictions on transfers. */
1185                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1186                         brq->data.blocks = 1;
1187
1188                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1189                         brq->data.blocks = card->ext_csd.rel_sectors;
1190                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1191                         brq->data.blocks = 1;
1192         }
1193 }
1194
1195 #define CMD_ERRORS                                                      \
1196         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1197          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1198          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1199          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1200          R1_CC_ERROR |          /* Card controller error */             \
1201          R1_ERROR)              /* General/unknown error */
1202
1203 static int mmc_blk_err_check(struct mmc_card *card,
1204                              struct mmc_async_req *areq)
1205 {
1206         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1207                                                     mmc_active);
1208         struct mmc_blk_request *brq = &mq_mrq->brq;
1209         struct request *req = mq_mrq->req;
1210         int need_retune = card->host->need_retune;
1211         int ecc_err = 0, gen_err = 0;
1212
1213         /*
1214          * sbc.error indicates a problem with the set block count
1215          * command.  No data will have been transferred.
1216          *
1217          * cmd.error indicates a problem with the r/w command.  No
1218          * data will have been transferred.
1219          *
1220          * stop.error indicates a problem with the stop command.  Data
1221          * may have been transferred, or may still be transferring.
1222          */
1223         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1224             brq->data.error) {
1225                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1226                 case ERR_RETRY:
1227                         return MMC_BLK_RETRY;
1228                 case ERR_ABORT:
1229                         return MMC_BLK_ABORT;
1230                 case ERR_NOMEDIUM:
1231                         return MMC_BLK_NOMEDIUM;
1232                 case ERR_CONTINUE:
1233                         break;
1234                 }
1235         }
1236
1237         /*
1238          * Check for errors relating to the execution of the
1239          * initial command - such as address errors.  No data
1240          * has been transferred.
1241          */
1242         if (brq->cmd.resp[0] & CMD_ERRORS) {
1243                 pr_err("%s: r/w command failed, status = %#x\n",
1244                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1245                 return MMC_BLK_ABORT;
1246         }
1247
1248         /*
1249          * Everything else is either success, or a data error of some
1250          * kind.  If it was a write, we may have transitioned to
1251          * program mode, which we have to wait for it to complete.
1252          */
1253         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1254                 int err;
1255
1256                 /* Check stop command response */
1257                 if (brq->stop.resp[0] & R1_ERROR) {
1258                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1259                                req->rq_disk->disk_name, __func__,
1260                                brq->stop.resp[0]);
1261                         gen_err = 1;
1262                 }
1263
1264                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1265                                         &gen_err);
1266                 if (err)
1267                         return MMC_BLK_CMD_ERR;
1268         }
1269
1270         /* if general error occurs, retry the write operation. */
1271         if (gen_err) {
1272                 pr_warn("%s: retrying write for general error\n",
1273                                 req->rq_disk->disk_name);
1274                 return MMC_BLK_RETRY;
1275         }
1276
1277         if (brq->data.error) {
1278                 if (need_retune && !brq->retune_retry_done) {
1279                         pr_info("%s: retrying because a re-tune was needed\n",
1280                                 req->rq_disk->disk_name);
1281                         brq->retune_retry_done = 1;
1282                         return MMC_BLK_RETRY;
1283                 }
1284                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1285                        req->rq_disk->disk_name, brq->data.error,
1286                        (unsigned)blk_rq_pos(req),
1287                        (unsigned)blk_rq_sectors(req),
1288                        brq->cmd.resp[0], brq->stop.resp[0]);
1289
1290                 if (rq_data_dir(req) == READ) {
1291                         if (ecc_err)
1292                                 return MMC_BLK_ECC_ERR;
1293                         return MMC_BLK_DATA_ERR;
1294                 } else {
1295                         return MMC_BLK_CMD_ERR;
1296                 }
1297         }
1298
1299         if (!brq->data.bytes_xfered)
1300                 return MMC_BLK_RETRY;
1301
1302         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1303                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1304                         return MMC_BLK_PARTIAL;
1305                 else
1306                         return MMC_BLK_SUCCESS;
1307         }
1308
1309         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1310                 return MMC_BLK_PARTIAL;
1311
1312         return MMC_BLK_SUCCESS;
1313 }
1314
1315 static int mmc_blk_packed_err_check(struct mmc_card *card,
1316                                     struct mmc_async_req *areq)
1317 {
1318         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1319                         mmc_active);
1320         struct request *req = mq_rq->req;
1321         struct mmc_packed *packed = mq_rq->packed;
1322         int err, check, status;
1323         u8 *ext_csd;
1324
1325         BUG_ON(!packed);
1326
1327         packed->retries--;
1328         check = mmc_blk_err_check(card, areq);
1329         err = get_card_status(card, &status, 0);
1330         if (err) {
1331                 pr_err("%s: error %d sending status command\n",
1332                        req->rq_disk->disk_name, err);
1333                 return MMC_BLK_ABORT;
1334         }
1335
1336         if (status & R1_EXCEPTION_EVENT) {
1337                 err = mmc_get_ext_csd(card, &ext_csd);
1338                 if (err) {
1339                         pr_err("%s: error %d sending ext_csd\n",
1340                                req->rq_disk->disk_name, err);
1341                         return MMC_BLK_ABORT;
1342                 }
1343
1344                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1345                      EXT_CSD_PACKED_FAILURE) &&
1346                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1347                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1348                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1349                             EXT_CSD_PACKED_INDEXED_ERROR) {
1350                                 packed->idx_failure =
1351                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1352                                 check = MMC_BLK_PARTIAL;
1353                         }
1354                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1355                                "failure index: %d\n",
1356                                req->rq_disk->disk_name, packed->nr_entries,
1357                                packed->blocks, packed->idx_failure);
1358                 }
1359                 kfree(ext_csd);
1360         }
1361
1362         return check;
1363 }
1364
1365 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1366                                struct mmc_card *card,
1367                                int disable_multi,
1368                                struct mmc_queue *mq)
1369 {
1370         u32 readcmd, writecmd;
1371         struct mmc_blk_request *brq = &mqrq->brq;
1372         struct request *req = mqrq->req;
1373         struct mmc_blk_data *md = mq->data;
1374         bool do_data_tag;
1375
1376         /*
1377          * Reliable writes are used to implement Forced Unit Access and
1378          * REQ_META accesses, and are supported only on MMCs.
1379          *
1380          * XXX: this really needs a good explanation of why REQ_META
1381          * is treated special.
1382          */
1383         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1384                           (req->cmd_flags & REQ_META)) &&
1385                 (rq_data_dir(req) == WRITE) &&
1386                 (md->flags & MMC_BLK_REL_WR);
1387
1388         memset(brq, 0, sizeof(struct mmc_blk_request));
1389         brq->mrq.cmd = &brq->cmd;
1390         brq->mrq.data = &brq->data;
1391
1392         brq->cmd.arg = blk_rq_pos(req);
1393         if (!mmc_card_blockaddr(card))
1394                 brq->cmd.arg <<= 9;
1395         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1396         brq->data.blksz = 512;
1397         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1398         brq->stop.arg = 0;
1399         brq->data.blocks = blk_rq_sectors(req);
1400
1401         /*
1402          * The block layer doesn't support all sector count
1403          * restrictions, so we need to be prepared for too big
1404          * requests.
1405          */
1406         if (brq->data.blocks > card->host->max_blk_count)
1407                 brq->data.blocks = card->host->max_blk_count;
1408
1409         if (brq->data.blocks > 1) {
1410                 /*
1411                  * After a read error, we redo the request one sector
1412                  * at a time in order to accurately determine which
1413                  * sectors can be read successfully.
1414                  */
1415                 if (disable_multi)
1416                         brq->data.blocks = 1;
1417
1418                 /*
1419                  * Some controllers have HW issues while operating
1420                  * in multiple I/O mode
1421                  */
1422                 if (card->host->ops->multi_io_quirk)
1423                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1424                                                 (rq_data_dir(req) == READ) ?
1425                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1426                                                 brq->data.blocks);
1427         }
1428
1429         if (brq->data.blocks > 1 || do_rel_wr) {
1430                 /* SPI multiblock writes terminate using a special
1431                  * token, not a STOP_TRANSMISSION request.
1432                  */
1433                 if (!mmc_host_is_spi(card->host) ||
1434                     rq_data_dir(req) == READ)
1435                         brq->mrq.stop = &brq->stop;
1436                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1437                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1438         } else {
1439                 brq->mrq.stop = NULL;
1440                 readcmd = MMC_READ_SINGLE_BLOCK;
1441                 writecmd = MMC_WRITE_BLOCK;
1442         }
1443         if (rq_data_dir(req) == READ) {
1444                 brq->cmd.opcode = readcmd;
1445                 brq->data.flags |= MMC_DATA_READ;
1446                 if (brq->mrq.stop)
1447                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1448                                         MMC_CMD_AC;
1449         } else {
1450                 brq->cmd.opcode = writecmd;
1451                 brq->data.flags |= MMC_DATA_WRITE;
1452                 if (brq->mrq.stop)
1453                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1454                                         MMC_CMD_AC;
1455         }
1456
1457         if (do_rel_wr)
1458                 mmc_apply_rel_rw(brq, card, req);
1459
1460         /*
1461          * Data tag is used only during writing meta data to speed
1462          * up write and any subsequent read of this meta data
1463          */
1464         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1465                 (req->cmd_flags & REQ_META) &&
1466                 (rq_data_dir(req) == WRITE) &&
1467                 ((brq->data.blocks * brq->data.blksz) >=
1468                  card->ext_csd.data_tag_unit_size);
1469
1470         /*
1471          * Pre-defined multi-block transfers are preferable to
1472          * open ended-ones (and necessary for reliable writes).
1473          * However, it is not sufficient to just send CMD23,
1474          * and avoid the final CMD12, as on an error condition
1475          * CMD12 (stop) needs to be sent anyway. This, coupled
1476          * with Auto-CMD23 enhancements provided by some
1477          * hosts, means that the complexity of dealing
1478          * with this is best left to the host. If CMD23 is
1479          * supported by card and host, we'll fill sbc in and let
1480          * the host deal with handling it correctly. This means
1481          * that for hosts that don't expose MMC_CAP_CMD23, no
1482          * change of behavior will be observed.
1483          *
1484          * N.B: Some MMC cards experience perf degradation.
1485          * We'll avoid using CMD23-bounded multiblock writes for
1486          * these, while retaining features like reliable writes.
1487          */
1488         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1489             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1490              do_data_tag)) {
1491                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1492                 brq->sbc.arg = brq->data.blocks |
1493                         (do_rel_wr ? (1 << 31) : 0) |
1494                         (do_data_tag ? (1 << 29) : 0);
1495                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1496                 brq->mrq.sbc = &brq->sbc;
1497         }
1498
1499         mmc_set_data_timeout(&brq->data, card);
1500
1501         brq->data.sg = mqrq->sg;
1502         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1503
1504         /*
1505          * Adjust the sg list so it is the same size as the
1506          * request.
1507          */
1508         if (brq->data.blocks != blk_rq_sectors(req)) {
1509                 int i, data_size = brq->data.blocks << 9;
1510                 struct scatterlist *sg;
1511
1512                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1513                         data_size -= sg->length;
1514                         if (data_size <= 0) {
1515                                 sg->length += data_size;
1516                                 i++;
1517                                 break;
1518                         }
1519                 }
1520                 brq->data.sg_len = i;
1521         }
1522
1523         mqrq->mmc_active.mrq = &brq->mrq;
1524         mqrq->mmc_active.err_check = mmc_blk_err_check;
1525
1526         mmc_queue_bounce_pre(mqrq);
1527 }
1528
1529 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1530                                           struct mmc_card *card)
1531 {
1532         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1533         unsigned int max_seg_sz = queue_max_segment_size(q);
1534         unsigned int len, nr_segs = 0;
1535
1536         do {
1537                 len = min(hdr_sz, max_seg_sz);
1538                 hdr_sz -= len;
1539                 nr_segs++;
1540         } while (hdr_sz);
1541
1542         return nr_segs;
1543 }
1544
1545 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1546 {
1547         struct request_queue *q = mq->queue;
1548         struct mmc_card *card = mq->card;
1549         struct request *cur = req, *next = NULL;
1550         struct mmc_blk_data *md = mq->data;
1551         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1552         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1553         unsigned int req_sectors = 0, phys_segments = 0;
1554         unsigned int max_blk_count, max_phys_segs;
1555         bool put_back = true;
1556         u8 max_packed_rw = 0;
1557         u8 reqs = 0;
1558
1559         if (!(md->flags & MMC_BLK_PACKED_CMD))
1560                 goto no_packed;
1561
1562         if ((rq_data_dir(cur) == WRITE) &&
1563             mmc_host_packed_wr(card->host))
1564                 max_packed_rw = card->ext_csd.max_packed_writes;
1565
1566         if (max_packed_rw == 0)
1567                 goto no_packed;
1568
1569         if (mmc_req_rel_wr(cur) &&
1570             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1571                 goto no_packed;
1572
1573         if (mmc_large_sector(card) &&
1574             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1575                 goto no_packed;
1576
1577         mmc_blk_clear_packed(mqrq);
1578
1579         max_blk_count = min(card->host->max_blk_count,
1580                             card->host->max_req_size >> 9);
1581         if (unlikely(max_blk_count > 0xffff))
1582                 max_blk_count = 0xffff;
1583
1584         max_phys_segs = queue_max_segments(q);
1585         req_sectors += blk_rq_sectors(cur);
1586         phys_segments += cur->nr_phys_segments;
1587
1588         if (rq_data_dir(cur) == WRITE) {
1589                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1590                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1591         }
1592
1593         do {
1594                 if (reqs >= max_packed_rw - 1) {
1595                         put_back = false;
1596                         break;
1597                 }
1598
1599                 spin_lock_irq(q->queue_lock);
1600                 next = blk_fetch_request(q);
1601                 spin_unlock_irq(q->queue_lock);
1602                 if (!next) {
1603                         put_back = false;
1604                         break;
1605                 }
1606
1607                 if (mmc_large_sector(card) &&
1608                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1609                         break;
1610
1611                 if (next->cmd_flags & REQ_DISCARD ||
1612                     next->cmd_flags & REQ_FLUSH)
1613                         break;
1614
1615                 if (rq_data_dir(cur) != rq_data_dir(next))
1616                         break;
1617
1618                 if (mmc_req_rel_wr(next) &&
1619                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1620                         break;
1621
1622                 req_sectors += blk_rq_sectors(next);
1623                 if (req_sectors > max_blk_count)
1624                         break;
1625
1626                 phys_segments +=  next->nr_phys_segments;
1627                 if (phys_segments > max_phys_segs)
1628                         break;
1629
1630                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1631                 cur = next;
1632                 reqs++;
1633         } while (1);
1634
1635         if (put_back) {
1636                 spin_lock_irq(q->queue_lock);
1637                 blk_requeue_request(q, next);
1638                 spin_unlock_irq(q->queue_lock);
1639         }
1640
1641         if (reqs > 0) {
1642                 list_add(&req->queuelist, &mqrq->packed->list);
1643                 mqrq->packed->nr_entries = ++reqs;
1644                 mqrq->packed->retries = reqs;
1645                 return reqs;
1646         }
1647
1648 no_packed:
1649         mqrq->cmd_type = MMC_PACKED_NONE;
1650         return 0;
1651 }
1652
1653 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1654                                         struct mmc_card *card,
1655                                         struct mmc_queue *mq)
1656 {
1657         struct mmc_blk_request *brq = &mqrq->brq;
1658         struct request *req = mqrq->req;
1659         struct request *prq;
1660         struct mmc_blk_data *md = mq->data;
1661         struct mmc_packed *packed = mqrq->packed;
1662         bool do_rel_wr, do_data_tag;
1663         u32 *packed_cmd_hdr;
1664         u8 hdr_blocks;
1665         u8 i = 1;
1666
1667         BUG_ON(!packed);
1668
1669         mqrq->cmd_type = MMC_PACKED_WRITE;
1670         packed->blocks = 0;
1671         packed->idx_failure = MMC_PACKED_NR_IDX;
1672
1673         packed_cmd_hdr = packed->cmd_hdr;
1674         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1675         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1676                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1677         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1678
1679         /*
1680          * Argument for each entry of packed group
1681          */
1682         list_for_each_entry(prq, &packed->list, queuelist) {
1683                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1684                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1685                         (prq->cmd_flags & REQ_META) &&
1686                         (rq_data_dir(prq) == WRITE) &&
1687                         ((brq->data.blocks * brq->data.blksz) >=
1688                          card->ext_csd.data_tag_unit_size);
1689                 /* Argument of CMD23 */
1690                 packed_cmd_hdr[(i * 2)] =
1691                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1692                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1693                         blk_rq_sectors(prq);
1694                 /* Argument of CMD18 or CMD25 */
1695                 packed_cmd_hdr[((i * 2)) + 1] =
1696                         mmc_card_blockaddr(card) ?
1697                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1698                 packed->blocks += blk_rq_sectors(prq);
1699                 i++;
1700         }
1701
1702         memset(brq, 0, sizeof(struct mmc_blk_request));
1703         brq->mrq.cmd = &brq->cmd;
1704         brq->mrq.data = &brq->data;
1705         brq->mrq.sbc = &brq->sbc;
1706         brq->mrq.stop = &brq->stop;
1707
1708         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1709         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1710         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1711
1712         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1713         brq->cmd.arg = blk_rq_pos(req);
1714         if (!mmc_card_blockaddr(card))
1715                 brq->cmd.arg <<= 9;
1716         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1717
1718         brq->data.blksz = 512;
1719         brq->data.blocks = packed->blocks + hdr_blocks;
1720         brq->data.flags |= MMC_DATA_WRITE;
1721
1722         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1723         brq->stop.arg = 0;
1724         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1725
1726         mmc_set_data_timeout(&brq->data, card);
1727
1728         brq->data.sg = mqrq->sg;
1729         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1730
1731         mqrq->mmc_active.mrq = &brq->mrq;
1732         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1733
1734         mmc_queue_bounce_pre(mqrq);
1735 }
1736
1737 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1738                            struct mmc_blk_request *brq, struct request *req,
1739                            int ret)
1740 {
1741         struct mmc_queue_req *mq_rq;
1742         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1743
1744         /*
1745          * If this is an SD card and we're writing, we can first
1746          * mark the known good sectors as ok.
1747          *
1748          * If the card is not SD, we can still ok written sectors
1749          * as reported by the controller (which might be less than
1750          * the real number of written sectors, but never more).
1751          */
1752         if (mmc_card_sd(card)) {
1753                 u32 blocks;
1754
1755                 blocks = mmc_sd_num_wr_blocks(card);
1756                 if (blocks != (u32)-1) {
1757                         ret = blk_end_request(req, 0, blocks << 9);
1758                 }
1759         } else {
1760                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1761                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1762         }
1763         return ret;
1764 }
1765
1766 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1767 {
1768         struct request *prq;
1769         struct mmc_packed *packed = mq_rq->packed;
1770         int idx = packed->idx_failure, i = 0;
1771         int ret = 0;
1772
1773         BUG_ON(!packed);
1774
1775         while (!list_empty(&packed->list)) {
1776                 prq = list_entry_rq(packed->list.next);
1777                 if (idx == i) {
1778                         /* retry from error index */
1779                         packed->nr_entries -= idx;
1780                         mq_rq->req = prq;
1781                         ret = 1;
1782
1783                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1784                                 list_del_init(&prq->queuelist);
1785                                 mmc_blk_clear_packed(mq_rq);
1786                         }
1787                         return ret;
1788                 }
1789                 list_del_init(&prq->queuelist);
1790                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1791                 i++;
1792         }
1793
1794         mmc_blk_clear_packed(mq_rq);
1795         return ret;
1796 }
1797
1798 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1799 {
1800         struct request *prq;
1801         struct mmc_packed *packed = mq_rq->packed;
1802
1803         BUG_ON(!packed);
1804
1805         while (!list_empty(&packed->list)) {
1806                 prq = list_entry_rq(packed->list.next);
1807                 list_del_init(&prq->queuelist);
1808                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1809         }
1810
1811         mmc_blk_clear_packed(mq_rq);
1812 }
1813
1814 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1815                                       struct mmc_queue_req *mq_rq)
1816 {
1817         struct request *prq;
1818         struct request_queue *q = mq->queue;
1819         struct mmc_packed *packed = mq_rq->packed;
1820
1821         BUG_ON(!packed);
1822
1823         while (!list_empty(&packed->list)) {
1824                 prq = list_entry_rq(packed->list.prev);
1825                 if (prq->queuelist.prev != &packed->list) {
1826                         list_del_init(&prq->queuelist);
1827                         spin_lock_irq(q->queue_lock);
1828                         blk_requeue_request(mq->queue, prq);
1829                         spin_unlock_irq(q->queue_lock);
1830                 } else {
1831                         list_del_init(&prq->queuelist);
1832                 }
1833         }
1834
1835         mmc_blk_clear_packed(mq_rq);
1836 }
1837
1838 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1839 {
1840         struct mmc_blk_data *md = mq->data;
1841         struct mmc_card *card = md->queue.card;
1842         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1843         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1844         enum mmc_blk_status status;
1845         struct mmc_queue_req *mq_rq;
1846         struct request *req = rqc;
1847         struct mmc_async_req *areq;
1848         const u8 packed_nr = 2;
1849         u8 reqs = 0;
1850
1851         if (!rqc && !mq->mqrq_prev->req)
1852                 return 0;
1853
1854         if (rqc)
1855                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1856
1857         do {
1858                 if (rqc) {
1859                         /*
1860                          * When 4KB native sector is enabled, only 8 blocks
1861                          * multiple read or write is allowed
1862                          */
1863                         if ((brq->data.blocks & 0x07) &&
1864                             (card->ext_csd.data_sector_size == 4096)) {
1865                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1866                                         req->rq_disk->disk_name);
1867                                 mq_rq = mq->mqrq_cur;
1868                                 goto cmd_abort;
1869                         }
1870
1871                         if (reqs >= packed_nr)
1872                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1873                                                             card, mq);
1874                         else
1875                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1876                         areq = &mq->mqrq_cur->mmc_active;
1877                 } else
1878                         areq = NULL;
1879                 areq = mmc_start_req(card->host, areq, (int *) &status);
1880                 if (!areq) {
1881                         if (status == MMC_BLK_NEW_REQUEST)
1882                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1883                         return 0;
1884                 }
1885
1886                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1887                 brq = &mq_rq->brq;
1888                 req = mq_rq->req;
1889                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1890                 mmc_queue_bounce_post(mq_rq);
1891
1892                 switch (status) {
1893                 case MMC_BLK_SUCCESS:
1894                 case MMC_BLK_PARTIAL:
1895                         /*
1896                          * A block was successfully transferred.
1897                          */
1898                         mmc_blk_reset_success(md, type);
1899
1900                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1901                                 ret = mmc_blk_end_packed_req(mq_rq);
1902                                 break;
1903                         } else {
1904                                 ret = blk_end_request(req, 0,
1905                                                 brq->data.bytes_xfered);
1906                         }
1907
1908                         /*
1909                          * If the blk_end_request function returns non-zero even
1910                          * though all data has been transferred and no errors
1911                          * were returned by the host controller, it's a bug.
1912                          */
1913                         if (status == MMC_BLK_SUCCESS && ret) {
1914                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1915                                        __func__, blk_rq_bytes(req),
1916                                        brq->data.bytes_xfered);
1917                                 rqc = NULL;
1918                                 goto cmd_abort;
1919                         }
1920                         break;
1921                 case MMC_BLK_CMD_ERR:
1922                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1923                         if (mmc_blk_reset(md, card->host, type))
1924                                 goto cmd_abort;
1925                         if (!ret)
1926                                 goto start_new_req;
1927                         break;
1928                 case MMC_BLK_RETRY:
1929                         retune_retry_done = brq->retune_retry_done;
1930                         if (retry++ < 5)
1931                                 break;
1932                         /* Fall through */
1933                 case MMC_BLK_ABORT:
1934                         if (!mmc_blk_reset(md, card->host, type))
1935                                 break;
1936                         goto cmd_abort;
1937                 case MMC_BLK_DATA_ERR: {
1938                         int err;
1939
1940                         err = mmc_blk_reset(md, card->host, type);
1941                         if (!err)
1942                                 break;
1943                         if (err == -ENODEV ||
1944                                 mmc_packed_cmd(mq_rq->cmd_type))
1945                                 goto cmd_abort;
1946                         /* Fall through */
1947                 }
1948                 case MMC_BLK_ECC_ERR:
1949                         if (brq->data.blocks > 1) {
1950                                 /* Redo read one sector at a time */
1951                                 pr_warn("%s: retrying using single block read\n",
1952                                         req->rq_disk->disk_name);
1953                                 disable_multi = 1;
1954                                 break;
1955                         }
1956                         /*
1957                          * After an error, we redo I/O one sector at a
1958                          * time, so we only reach here after trying to
1959                          * read a single sector.
1960                          */
1961                         ret = blk_end_request(req, -EIO,
1962                                                 brq->data.blksz);
1963                         if (!ret)
1964                                 goto start_new_req;
1965                         break;
1966                 case MMC_BLK_NOMEDIUM:
1967                         goto cmd_abort;
1968                 default:
1969                         pr_err("%s: Unhandled return value (%d)",
1970                                         req->rq_disk->disk_name, status);
1971                         goto cmd_abort;
1972                 }
1973
1974                 if (ret) {
1975                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1976                                 if (!mq_rq->packed->retries)
1977                                         goto cmd_abort;
1978                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1979                                 mmc_start_req(card->host,
1980                                               &mq_rq->mmc_active, NULL);
1981                         } else {
1982
1983                                 /*
1984                                  * In case of a incomplete request
1985                                  * prepare it again and resend.
1986                                  */
1987                                 mmc_blk_rw_rq_prep(mq_rq, card,
1988                                                 disable_multi, mq);
1989                                 mmc_start_req(card->host,
1990                                                 &mq_rq->mmc_active, NULL);
1991                         }
1992                         mq_rq->brq.retune_retry_done = retune_retry_done;
1993                 }
1994         } while (ret);
1995
1996         return 1;
1997
1998  cmd_abort:
1999         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2000                 mmc_blk_abort_packed_req(mq_rq);
2001         } else {
2002                 if (mmc_card_removed(card))
2003                         req->cmd_flags |= REQ_QUIET;
2004                 while (ret)
2005                         ret = blk_end_request(req, -EIO,
2006                                         blk_rq_cur_bytes(req));
2007         }
2008
2009  start_new_req:
2010         if (rqc) {
2011                 if (mmc_card_removed(card)) {
2012                         rqc->cmd_flags |= REQ_QUIET;
2013                         blk_end_request_all(rqc, -EIO);
2014                 } else {
2015                         /*
2016                          * If current request is packed, it needs to put back.
2017                          */
2018                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2019                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2020
2021                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2022                         mmc_start_req(card->host,
2023                                       &mq->mqrq_cur->mmc_active, NULL);
2024                 }
2025         }
2026
2027         return 0;
2028 }
2029
2030 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2031 {
2032         int ret;
2033         struct mmc_blk_data *md = mq->data;
2034         struct mmc_card *card = md->queue.card;
2035         struct mmc_host *host = card->host;
2036         unsigned long flags;
2037         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2038
2039         if (req && !mq->mqrq_prev->req)
2040                 /* claim host only for the first request */
2041                 mmc_get_card(card);
2042
2043         ret = mmc_blk_part_switch(card, md);
2044         if (ret) {
2045                 if (req) {
2046                         blk_end_request_all(req, -EIO);
2047                 }
2048                 ret = 0;
2049                 goto out;
2050         }
2051
2052         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2053         if (cmd_flags & REQ_DISCARD) {
2054                 /* complete ongoing async transfer before issuing discard */
2055                 if (card->host->areq)
2056                         mmc_blk_issue_rw_rq(mq, NULL);
2057                 if (req->cmd_flags & REQ_SECURE)
2058                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2059                 else
2060                         ret = mmc_blk_issue_discard_rq(mq, req);
2061         } else if (cmd_flags & REQ_FLUSH) {
2062                 /* complete ongoing async transfer before issuing flush */
2063                 if (card->host->areq)
2064                         mmc_blk_issue_rw_rq(mq, NULL);
2065                 ret = mmc_blk_issue_flush(mq, req);
2066         } else {
2067                 if (!req && host->areq) {
2068                         spin_lock_irqsave(&host->context_info.lock, flags);
2069                         host->context_info.is_waiting_last_req = true;
2070                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2071                 }
2072                 ret = mmc_blk_issue_rw_rq(mq, req);
2073         }
2074
2075 out:
2076         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2077              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2078                 /*
2079                  * Release host when there are no more requests
2080                  * and after special request(discard, flush) is done.
2081                  * In case sepecial request, there is no reentry to
2082                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2083                  */
2084                 mmc_put_card(card);
2085         return ret;
2086 }
2087
2088 static inline int mmc_blk_readonly(struct mmc_card *card)
2089 {
2090         return mmc_card_readonly(card) ||
2091                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2092 }
2093
2094 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2095                                               struct device *parent,
2096                                               sector_t size,
2097                                               bool default_ro,
2098                                               const char *subname,
2099                                               int area_type)
2100 {
2101         struct mmc_blk_data *md;
2102         int devidx, ret;
2103
2104         devidx = find_first_zero_bit(dev_use, max_devices);
2105         if (devidx >= max_devices)
2106                 return ERR_PTR(-ENOSPC);
2107         __set_bit(devidx, dev_use);
2108
2109         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2110         if (!md) {
2111                 ret = -ENOMEM;
2112                 goto out;
2113         }
2114
2115         /*
2116          * !subname implies we are creating main mmc_blk_data that will be
2117          * associated with mmc_card with dev_set_drvdata. Due to device
2118          * partitions, devidx will not coincide with a per-physical card
2119          * index anymore so we keep track of a name index.
2120          */
2121         if (!subname) {
2122                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2123                 __set_bit(md->name_idx, name_use);
2124         } else
2125                 md->name_idx = ((struct mmc_blk_data *)
2126                                 dev_to_disk(parent)->private_data)->name_idx;
2127
2128         md->area_type = area_type;
2129
2130         /*
2131          * Set the read-only status based on the supported commands
2132          * and the write protect switch.
2133          */
2134         md->read_only = mmc_blk_readonly(card);
2135
2136         md->disk = alloc_disk(perdev_minors);
2137         if (md->disk == NULL) {
2138                 ret = -ENOMEM;
2139                 goto err_kfree;
2140         }
2141
2142         spin_lock_init(&md->lock);
2143         INIT_LIST_HEAD(&md->part);
2144         md->usage = 1;
2145
2146         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2147         if (ret)
2148                 goto err_putdisk;
2149
2150         md->queue.issue_fn = mmc_blk_issue_rq;
2151         md->queue.data = md;
2152
2153         md->disk->major = MMC_BLOCK_MAJOR;
2154         md->disk->first_minor = devidx * perdev_minors;
2155         md->disk->fops = &mmc_bdops;
2156         md->disk->private_data = md;
2157         md->disk->queue = md->queue.queue;
2158         md->disk->driverfs_dev = parent;
2159         set_disk_ro(md->disk, md->read_only || default_ro);
2160         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2161                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2162
2163         /*
2164          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2165          *
2166          * - be set for removable media with permanent block devices
2167          * - be unset for removable block devices with permanent media
2168          *
2169          * Since MMC block devices clearly fall under the second
2170          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2171          * should use the block device creation/destruction hotplug
2172          * messages to tell when the card is present.
2173          */
2174
2175         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2176                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2177
2178         if (mmc_card_mmc(card))
2179                 blk_queue_logical_block_size(md->queue.queue,
2180                                              card->ext_csd.data_sector_size);
2181         else
2182                 blk_queue_logical_block_size(md->queue.queue, 512);
2183
2184         set_capacity(md->disk, size);
2185
2186         if (mmc_host_cmd23(card->host)) {
2187                 if (mmc_card_mmc(card) ||
2188                     (mmc_card_sd(card) &&
2189                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2190                         md->flags |= MMC_BLK_CMD23;
2191         }
2192
2193         if (mmc_card_mmc(card) &&
2194             md->flags & MMC_BLK_CMD23 &&
2195             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2196              card->ext_csd.rel_sectors)) {
2197                 md->flags |= MMC_BLK_REL_WR;
2198                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2199         }
2200
2201         if (mmc_card_mmc(card) &&
2202             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2203             (md->flags & MMC_BLK_CMD23) &&
2204             card->ext_csd.packed_event_en) {
2205                 if (!mmc_packed_init(&md->queue, card))
2206                         md->flags |= MMC_BLK_PACKED_CMD;
2207         }
2208
2209         return md;
2210
2211  err_putdisk:
2212         put_disk(md->disk);
2213  err_kfree:
2214         kfree(md);
2215  out:
2216         return ERR_PTR(ret);
2217 }
2218
2219 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2220 {
2221         sector_t size;
2222
2223         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2224                 /*
2225                  * The EXT_CSD sector count is in number or 512 byte
2226                  * sectors.
2227                  */
2228                 size = card->ext_csd.sectors;
2229         } else {
2230                 /*
2231                  * The CSD capacity field is in units of read_blkbits.
2232                  * set_capacity takes units of 512 bytes.
2233                  */
2234                 size = (typeof(sector_t))card->csd.capacity
2235                         << (card->csd.read_blkbits - 9);
2236         }
2237
2238         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2239                                         MMC_BLK_DATA_AREA_MAIN);
2240 }
2241
2242 static int mmc_blk_alloc_part(struct mmc_card *card,
2243                               struct mmc_blk_data *md,
2244                               unsigned int part_type,
2245                               sector_t size,
2246                               bool default_ro,
2247                               const char *subname,
2248                               int area_type)
2249 {
2250         char cap_str[10];
2251         struct mmc_blk_data *part_md;
2252
2253         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2254                                     subname, area_type);
2255         if (IS_ERR(part_md))
2256                 return PTR_ERR(part_md);
2257         part_md->part_type = part_type;
2258         list_add(&part_md->part, &md->part);
2259
2260         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2261                         cap_str, sizeof(cap_str));
2262         pr_info("%s: %s %s partition %u %s\n",
2263                part_md->disk->disk_name, mmc_card_id(card),
2264                mmc_card_name(card), part_md->part_type, cap_str);
2265         return 0;
2266 }
2267
2268 /* MMC Physical partitions consist of two boot partitions and
2269  * up to four general purpose partitions.
2270  * For each partition enabled in EXT_CSD a block device will be allocatedi
2271  * to provide access to the partition.
2272  */
2273
2274 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2275 {
2276         int idx, ret = 0;
2277
2278         if (!mmc_card_mmc(card))
2279                 return 0;
2280
2281         for (idx = 0; idx < card->nr_parts; idx++) {
2282                 if (card->part[idx].size) {
2283                         ret = mmc_blk_alloc_part(card, md,
2284                                 card->part[idx].part_cfg,
2285                                 card->part[idx].size >> 9,
2286                                 card->part[idx].force_ro,
2287                                 card->part[idx].name,
2288                                 card->part[idx].area_type);
2289                         if (ret)
2290                                 return ret;
2291                 }
2292         }
2293
2294         return ret;
2295 }
2296
2297 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2298 {
2299         struct mmc_card *card;
2300
2301         if (md) {
2302                 /*
2303                  * Flush remaining requests and free queues. It
2304                  * is freeing the queue that stops new requests
2305                  * from being accepted.
2306                  */
2307                 card = md->queue.card;
2308                 mmc_cleanup_queue(&md->queue);
2309                 if (md->flags & MMC_BLK_PACKED_CMD)
2310                         mmc_packed_clean(&md->queue);
2311                 if (md->disk->flags & GENHD_FL_UP) {
2312                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2313                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2314                                         card->ext_csd.boot_ro_lockable)
2315                                 device_remove_file(disk_to_dev(md->disk),
2316                                         &md->power_ro_lock);
2317
2318                         del_gendisk(md->disk);
2319                 }
2320                 mmc_blk_put(md);
2321         }
2322 }
2323
2324 static void mmc_blk_remove_parts(struct mmc_card *card,
2325                                  struct mmc_blk_data *md)
2326 {
2327         struct list_head *pos, *q;
2328         struct mmc_blk_data *part_md;
2329
2330         __clear_bit(md->name_idx, name_use);
2331         list_for_each_safe(pos, q, &md->part) {
2332                 part_md = list_entry(pos, struct mmc_blk_data, part);
2333                 list_del(pos);
2334                 mmc_blk_remove_req(part_md);
2335         }
2336 }
2337
2338 static int mmc_add_disk(struct mmc_blk_data *md)
2339 {
2340         int ret;
2341         struct mmc_card *card = md->queue.card;
2342
2343         add_disk(md->disk);
2344         md->force_ro.show = force_ro_show;
2345         md->force_ro.store = force_ro_store;
2346         sysfs_attr_init(&md->force_ro.attr);
2347         md->force_ro.attr.name = "force_ro";
2348         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2349         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2350         if (ret)
2351                 goto force_ro_fail;
2352
2353         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2354              card->ext_csd.boot_ro_lockable) {
2355                 umode_t mode;
2356
2357                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2358                         mode = S_IRUGO;
2359                 else
2360                         mode = S_IRUGO | S_IWUSR;
2361
2362                 md->power_ro_lock.show = power_ro_lock_show;
2363                 md->power_ro_lock.store = power_ro_lock_store;
2364                 sysfs_attr_init(&md->power_ro_lock.attr);
2365                 md->power_ro_lock.attr.mode = mode;
2366                 md->power_ro_lock.attr.name =
2367                                         "ro_lock_until_next_power_on";
2368                 ret = device_create_file(disk_to_dev(md->disk),
2369                                 &md->power_ro_lock);
2370                 if (ret)
2371                         goto power_ro_lock_fail;
2372         }
2373         return ret;
2374
2375 power_ro_lock_fail:
2376         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2377 force_ro_fail:
2378         del_gendisk(md->disk);
2379
2380         return ret;
2381 }
2382
2383 #define CID_MANFID_SANDISK      0x2
2384 #define CID_MANFID_TOSHIBA      0x11
2385 #define CID_MANFID_MICRON       0x13
2386 #define CID_MANFID_SAMSUNG      0x15
2387
2388 static const struct mmc_fixup blk_fixups[] =
2389 {
2390         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2391                   MMC_QUIRK_INAND_CMD38),
2392         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2393                   MMC_QUIRK_INAND_CMD38),
2394         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2395                   MMC_QUIRK_INAND_CMD38),
2396         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2397                   MMC_QUIRK_INAND_CMD38),
2398         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2399                   MMC_QUIRK_INAND_CMD38),
2400
2401         /*
2402          * Some MMC cards experience performance degradation with CMD23
2403          * instead of CMD12-bounded multiblock transfers. For now we'll
2404          * black list what's bad...
2405          * - Certain Toshiba cards.
2406          *
2407          * N.B. This doesn't affect SD cards.
2408          */
2409         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2410                   MMC_QUIRK_BLK_NO_CMD23),
2411         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2412                   MMC_QUIRK_BLK_NO_CMD23),
2413         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2414                   MMC_QUIRK_BLK_NO_CMD23),
2415
2416         /*
2417          * Some Micron MMC cards needs longer data read timeout than
2418          * indicated in CSD.
2419          */
2420         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2421                   MMC_QUIRK_LONG_READ_TIME),
2422
2423         /*
2424          * On these Samsung MoviNAND parts, performing secure erase or
2425          * secure trim can result in unrecoverable corruption due to a
2426          * firmware bug.
2427          */
2428         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2429                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2430         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2431                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2432         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2433                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2434         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2435                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2436         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2437                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2438         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2439                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2440         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2441                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2442         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2443                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2444
2445         END_FIXUP
2446 };
2447
2448 static int mmc_blk_probe(struct mmc_card *card)
2449 {
2450         struct mmc_blk_data *md, *part_md;
2451         char cap_str[10];
2452
2453         /*
2454          * Check that the card supports the command class(es) we need.
2455          */
2456         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2457                 return -ENODEV;
2458
2459         mmc_fixup_device(card, blk_fixups);
2460
2461         md = mmc_blk_alloc(card);
2462         if (IS_ERR(md))
2463                 return PTR_ERR(md);
2464
2465         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2466                         cap_str, sizeof(cap_str));
2467         pr_info("%s: %s %s %s %s\n",
2468                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2469                 cap_str, md->read_only ? "(ro)" : "");
2470
2471         if (mmc_blk_alloc_parts(card, md))
2472                 goto out;
2473
2474         dev_set_drvdata(&card->dev, md);
2475
2476         if (mmc_add_disk(md))
2477                 goto out;
2478
2479         list_for_each_entry(part_md, &md->part, part) {
2480                 if (mmc_add_disk(part_md))
2481                         goto out;
2482         }
2483
2484         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2485         pm_runtime_use_autosuspend(&card->dev);
2486
2487         /*
2488          * Don't enable runtime PM for SD-combo cards here. Leave that
2489          * decision to be taken during the SDIO init sequence instead.
2490          */
2491         if (card->type != MMC_TYPE_SD_COMBO) {
2492                 pm_runtime_set_active(&card->dev);
2493                 pm_runtime_enable(&card->dev);
2494         }
2495
2496         return 0;
2497
2498  out:
2499         mmc_blk_remove_parts(card, md);
2500         mmc_blk_remove_req(md);
2501         return 0;
2502 }
2503
2504 static void mmc_blk_remove(struct mmc_card *card)
2505 {
2506         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2507
2508         mmc_blk_remove_parts(card, md);
2509         pm_runtime_get_sync(&card->dev);
2510         mmc_claim_host(card->host);
2511         mmc_blk_part_switch(card, md);
2512         mmc_release_host(card->host);
2513         if (card->type != MMC_TYPE_SD_COMBO)
2514                 pm_runtime_disable(&card->dev);
2515         pm_runtime_put_noidle(&card->dev);
2516         mmc_blk_remove_req(md);
2517         dev_set_drvdata(&card->dev, NULL);
2518 }
2519
2520 static int _mmc_blk_suspend(struct mmc_card *card)
2521 {
2522         struct mmc_blk_data *part_md;
2523         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2524
2525         if (md) {
2526                 mmc_queue_suspend(&md->queue);
2527                 list_for_each_entry(part_md, &md->part, part) {
2528                         mmc_queue_suspend(&part_md->queue);
2529                 }
2530         }
2531         return 0;
2532 }
2533
2534 static void mmc_blk_shutdown(struct mmc_card *card)
2535 {
2536         _mmc_blk_suspend(card);
2537 }
2538
2539 #ifdef CONFIG_PM_SLEEP
2540 static int mmc_blk_suspend(struct device *dev)
2541 {
2542         struct mmc_card *card = mmc_dev_to_card(dev);
2543
2544         return _mmc_blk_suspend(card);
2545 }
2546
2547 static int mmc_blk_resume(struct device *dev)
2548 {
2549         struct mmc_blk_data *part_md;
2550         struct mmc_blk_data *md = dev_get_drvdata(dev);
2551
2552         if (md) {
2553                 /*
2554                  * Resume involves the card going into idle state,
2555                  * so current partition is always the main one.
2556                  */
2557                 md->part_curr = md->part_type;
2558                 mmc_queue_resume(&md->queue);
2559                 list_for_each_entry(part_md, &md->part, part) {
2560                         mmc_queue_resume(&part_md->queue);
2561                 }
2562         }
2563         return 0;
2564 }
2565 #endif
2566
2567 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2568
2569 static struct mmc_driver mmc_driver = {
2570         .drv            = {
2571                 .name   = "mmcblk",
2572                 .pm     = &mmc_blk_pm_ops,
2573         },
2574         .probe          = mmc_blk_probe,
2575         .remove         = mmc_blk_remove,
2576         .shutdown       = mmc_blk_shutdown,
2577 };
2578
2579 static int __init mmc_blk_init(void)
2580 {
2581         int res;
2582
2583         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2584                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2585
2586         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2587
2588         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2589         if (res)
2590                 goto out;
2591
2592         res = mmc_register_driver(&mmc_driver);
2593         if (res)
2594                 goto out2;
2595
2596         return 0;
2597  out2:
2598         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2599  out:
2600         return res;
2601 }
2602
2603 static void __exit mmc_blk_exit(void)
2604 {
2605         mmc_unregister_driver(&mmc_driver);
2606         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2607 }
2608
2609 module_init(mmc_blk_init);
2610 module_exit(mmc_blk_exit);
2611
2612 MODULE_LICENSE("GPL");
2613 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2614