drivers/mmc/card/block.c

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