drivers/mmc/card/block.c

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