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                 goto cmd_err;
 660
 661         card = md->queue.card;
 662         if (IS_ERR(card)) {
 663                 err = PTR_ERR(card);
 664                 goto cmd_done;
 665         }
 666
 667         mmc_get_card(card);
 668
 669         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 670                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 671
 672         mmc_put_card(card);
 673
 674         /* copy to user if data and response */
 675         for (i = 0; i < num_of_cmds && !err; i++)
 676                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 677
 678 cmd_done:
 679         mmc_blk_put(md);
 680 cmd_err:
 681         for (i = 0; i < num_of_cmds; i++) {
 682                 kfree(idata[i]->buf);
 683                 kfree(idata[i]);
 684         }
 685         kfree(idata);
 686         return ioc_err ? ioc_err : err;
 687 }
 688
 689 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 690         unsigned int cmd, unsigned long arg)
 691 {
 692         /*
 693          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 694          * whole block device, not on a partition.  This prevents overspray
 695          * between sibling partitions.
 696          */
 697         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 698                 return -EPERM;
 699
 700         switch (cmd) {
 701         case MMC_IOC_CMD:
 702                 return mmc_blk_ioctl_cmd(bdev,
 703                                 (struct mmc_ioc_cmd __user *)arg);
 704         case MMC_IOC_MULTI_CMD:
 705                 return mmc_blk_ioctl_multi_cmd(bdev,
 706                                 (struct mmc_ioc_multi_cmd __user *)arg);
 707         default:
 708                 return -EINVAL;
 709         }
 710 }
 711
 712 #ifdef CONFIG_COMPAT
 713 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 714         unsigned int cmd, unsigned long arg)
 715 {
 716         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 717 }
 718 #endif
 719
 720 static const struct block_device_operations mmc_bdops = {
 721         .open                   = mmc_blk_open,
 722         .release                = mmc_blk_release,
 723         .getgeo                 = mmc_blk_getgeo,
 724         .owner                  = THIS_MODULE,
 725         .ioctl                  = mmc_blk_ioctl,
 726 #ifdef CONFIG_COMPAT
 727         .compat_ioctl           = mmc_blk_compat_ioctl,
 728 #endif
 729 };
 730
 731 static inline int mmc_blk_part_switch(struct mmc_card *card,
 732                                       struct mmc_blk_data *md)
 733 {
 734         int ret;
 735         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 736
 737         if (main_md->part_curr == md->part_type)
 738                 return 0;
 739
 740         if (mmc_card_mmc(card)) {
 741                 u8 part_config = card->ext_csd.part_config;
 742
 743                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 744                 part_config |= md->part_type;
 745
 746                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 747                                  EXT_CSD_PART_CONFIG, part_config,
 748                                  card->ext_csd.part_time);
 749                 if (ret)
 750                         return ret;
 751
 752                 card->ext_csd.part_config = part_config;
 753         }
 754
 755         main_md->part_curr = md->part_type;
 756         return 0;
 757 }
 758
 759 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 760 {
 761         int err;
 762         u32 result;
 763         __be32 *blocks;
 764
 765         struct mmc_request mrq = {NULL};
 766         struct mmc_command cmd = {0};
 767         struct mmc_data data = {0};
 768
 769         struct scatterlist sg;
 770
 771         cmd.opcode = MMC_APP_CMD;
 772         cmd.arg = card->rca << 16;
 773         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 774
 775         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 776         if (err)
 777                 return (u32)-1;
 778         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 779                 return (u32)-1;
 780
 781         memset(&cmd, 0, sizeof(struct mmc_command));
 782
 783         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 784         cmd.arg = 0;
 785         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 786
 787         data.blksz = 4;
 788         data.blocks = 1;
 789         data.flags = MMC_DATA_READ;
 790         data.sg = &sg;
 791         data.sg_len = 1;
 792         mmc_set_data_timeout(&data, card);
 793
 794         mrq.cmd = &cmd;
 795         mrq.data = &data;
 796
 797         blocks = kmalloc(4, GFP_KERNEL);
 798         if (!blocks)
 799                 return (u32)-1;
 800
 801         sg_init_one(&sg, blocks, 4);
 802
 803         mmc_wait_for_req(card->host, &mrq);
 804
 805         result = ntohl(*blocks);
 806         kfree(blocks);
 807
 808         if (cmd.error || data.error)
 809                 result = (u32)-1;
 810
 811         return result;
 812 }
 813
 814 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 815 {
 816         struct mmc_command cmd = {0};
 817         int err;
 818
 819         cmd.opcode = MMC_SEND_STATUS;
 820         if (!mmc_host_is_spi(card->host))
 821                 cmd.arg = card->rca << 16;
 822         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 823         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 824         if (err == 0)
 825                 *status = cmd.resp[0];
 826         return err;
 827 }
 828
 829 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 830                 bool hw_busy_detect, struct request *req, int *gen_err)
 831 {
 832         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 833         int err = 0;
 834         u32 status;
 835
 836         do {
 837                 err = get_card_status(card, &status, 5);
 838                 if (err) {
 839                         pr_err("%s: error %d requesting status\n",
 840                                req->rq_disk->disk_name, err);
 841                         return err;
 842                 }
 843
 844                 if (status & R1_ERROR) {
 845                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 846                                 req->rq_disk->disk_name, __func__, status);
 847                         *gen_err = 1;
 848                 }
 849
 850                 /* We may rely on the host hw to handle busy detection.*/
 851                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 852                         hw_busy_detect)
 853                         break;
 854
 855                 /*
 856                  * Timeout if the device never becomes ready for data and never
 857                  * leaves the program state.
 858                  */
 859                 if (time_after(jiffies, timeout)) {
 860                         pr_err("%s: Card stuck in programming state! %s %s\n",
 861                                 mmc_hostname(card->host),
 862                                 req->rq_disk->disk_name, __func__);
 863                         return -ETIMEDOUT;
 864                 }
 865
 866                 /*
 867                  * Some cards mishandle the status bits,
 868                  * so make sure to check both the busy
 869                  * indication and the card state.
 870                  */
 871         } while (!(status & R1_READY_FOR_DATA) ||
 872                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 873
 874         return err;
 875 }
 876
 877 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 878                 struct request *req, int *gen_err, u32 *stop_status)
 879 {
 880         struct mmc_host *host = card->host;
 881         struct mmc_command cmd = {0};
 882         int err;
 883         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 884
 885         /*
 886          * Normally we use R1B responses for WRITE, but in cases where the host
 887          * has specified a max_busy_timeout we need to validate it. A failure
 888          * means we need to prevent the host from doing hw busy detection, which
 889          * is done by converting to a R1 response instead.
 890          */
 891         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 892                 use_r1b_resp = false;
 893
 894         cmd.opcode = MMC_STOP_TRANSMISSION;
 895         if (use_r1b_resp) {
 896                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 897                 cmd.busy_timeout = timeout_ms;
 898         } else {
 899                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 900         }
 901
 902         err = mmc_wait_for_cmd(host, &cmd, 5);
 903         if (err)
 904                 return err;
 905
 906         *stop_status = cmd.resp[0];
 907
 908         /* No need to check card status in case of READ. */
 909         if (rq_data_dir(req) == READ)
 910                 return 0;
 911
 912         if (!mmc_host_is_spi(host) &&
 913                 (*stop_status & R1_ERROR)) {
 914                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 915                         req->rq_disk->disk_name, __func__, *stop_status);
 916                 *gen_err = 1;
 917         }
 918
 919         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 920 }
 921
 922 #define ERR_NOMEDIUM    3
 923 #define ERR_RETRY       2
 924 #define ERR_ABORT       1
 925 #define ERR_CONTINUE    0
 926
 927 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 928         bool status_valid, u32 status)
 929 {
 930         switch (error) {
 931         case -EILSEQ:
 932                 /* response crc error, retry the r/w cmd */
 933                 pr_err("%s: %s sending %s command, card status %#x\n",
 934                         req->rq_disk->disk_name, "response CRC error",
 935                         name, status);
 936                 return ERR_RETRY;
 937
 938         case -ETIMEDOUT:
 939                 pr_err("%s: %s sending %s command, card status %#x\n",
 940                         req->rq_disk->disk_name, "timed out", name, status);
 941
 942                 /* If the status cmd initially failed, retry the r/w cmd */
 943                 if (!status_valid)
 944                         return ERR_RETRY;
 945
 946                 /*
 947                  * If it was a r/w cmd crc error, or illegal command
 948                  * (eg, issued in wrong state) then retry - we should
 949                  * have corrected the state problem above.
 950                  */
 951                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 952                         return ERR_RETRY;
 953
 954                 /* Otherwise abort the command */
 955                 return ERR_ABORT;
 956
 957         default:
 958                 /* We don't understand the error code the driver gave us */
 959                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 960                        req->rq_disk->disk_name, error, status);
 961                 return ERR_ABORT;
 962         }
 963 }
 964
 965 /*
 966  * Initial r/w and stop cmd error recovery.
 967  * We don't know whether the card received the r/w cmd or not, so try to
 968  * restore things back to a sane state.  Essentially, we do this as follows:
 969  * - Obtain card status.  If the first attempt to obtain card status fails,
 970  *   the status word will reflect the failed status cmd, not the failed
 971  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 972  *   longer communicate with the card.
 973  * - Check the card state.  If the card received the cmd but there was a
 974  *   transient problem with the response, it might still be in a data transfer
 975  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 976  * - If the r/w cmd failed due to a response CRC error, it was probably
 977  *   transient, so retry the cmd.
 978  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 979  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 980  *   illegal cmd, retry.
 981  * Otherwise we don't understand what happened, so abort.
 982  */
 983 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 984         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 985 {
 986         bool prev_cmd_status_valid = true;
 987         u32 status, stop_status = 0;
 988         int err, retry;
 989
 990         if (mmc_card_removed(card))
 991                 return ERR_NOMEDIUM;
 992
 993         /*
 994          * Try to get card status which indicates both the card state
 995          * and why there was no response.  If the first attempt fails,
 996          * we can't be sure the returned status is for the r/w command.
 997          */
 998         for (retry = 2; retry >= 0; retry--) {
 999                 err = get_card_status(card, &status, 0);
1000                 if (!err)
1001                         break;
1002
1003                 /* Re-tune if needed */
1004                 mmc_retune_recheck(card->host);
1005
1006                 prev_cmd_status_valid = false;
1007                 pr_err("%s: error %d sending status command, %sing\n",
1008                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1009         }
1010
1011         /* We couldn't get a response from the card.  Give up. */
1012         if (err) {
1013                 /* Check if the card is removed */
1014                 if (mmc_detect_card_removed(card->host))
1015                         return ERR_NOMEDIUM;
1016                 return ERR_ABORT;
1017         }
1018
1019         /* Flag ECC errors */
1020         if ((status & R1_CARD_ECC_FAILED) ||
1021             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1022             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1023                 *ecc_err = 1;
1024
1025         /* Flag General errors */
1026         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1027                 if ((status & R1_ERROR) ||
1028                         (brq->stop.resp[0] & R1_ERROR)) {
1029                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1030                                req->rq_disk->disk_name, __func__,
1031                                brq->stop.resp[0], status);
1032                         *gen_err = 1;
1033                 }
1034
1035         /*
1036          * Check the current card state.  If it is in some data transfer
1037          * mode, tell it to stop (and hopefully transition back to TRAN.)
1038          */
1039         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1040             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1041                 err = send_stop(card,
1042                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1043                         req, gen_err, &stop_status);
1044                 if (err) {
1045                         pr_err("%s: error %d sending stop command\n",
1046                                req->rq_disk->disk_name, err);
1047                         /*
1048                          * If the stop cmd also timed out, the card is probably
1049                          * not present, so abort. Other errors are bad news too.
1050                          */
1051                         return ERR_ABORT;
1052                 }
1053
1054                 if (stop_status & R1_CARD_ECC_FAILED)
1055                         *ecc_err = 1;
1056         }
1057
1058         /* Check for set block count errors */
1059         if (brq->sbc.error)
1060                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1061                                 prev_cmd_status_valid, status);
1062
1063         /* Check for r/w command errors */
1064         if (brq->cmd.error)
1065                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1066                                 prev_cmd_status_valid, status);
1067
1068         /* Data errors */
1069         if (!brq->stop.error)
1070                 return ERR_CONTINUE;
1071
1072         /* Now for stop errors.  These aren't fatal to the transfer. */
1073         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1074                req->rq_disk->disk_name, brq->stop.error,
1075                brq->cmd.resp[0], status);
1076
1077         /*
1078          * Subsitute in our own stop status as this will give the error
1079          * state which happened during the execution of the r/w command.
1080          */
1081         if (stop_status) {
1082                 brq->stop.resp[0] = stop_status;
1083                 brq->stop.error = 0;
1084         }
1085         return ERR_CONTINUE;
1086 }
1087
1088 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1089                          int type)
1090 {
1091         int err;
1092
1093         if (md->reset_done & type)
1094                 return -EEXIST;
1095
1096         md->reset_done |= type;
1097         err = mmc_hw_reset(host);
1098         /* Ensure we switch back to the correct partition */
1099         if (err != -EOPNOTSUPP) {
1100                 struct mmc_blk_data *main_md =
1101                         dev_get_drvdata(&host->card->dev);
1102                 int part_err;
1103
1104                 main_md->part_curr = main_md->part_type;
1105                 part_err = mmc_blk_part_switch(host->card, md);
1106                 if (part_err) {
1107                         /*
1108                          * We have failed to get back into the correct
1109                          * partition, so we need to abort the whole request.
1110                          */
1111                         return -ENODEV;
1112                 }
1113         }
1114         return err;
1115 }
1116
1117 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1118 {
1119         md->reset_done &= ~type;
1120 }
1121
1122 int mmc_access_rpmb(struct mmc_queue *mq)
1123 {
1124         struct mmc_blk_data *md = mq->data;
1125         /*
1126          * If this is a RPMB partition access, return ture
1127          */
1128         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1129                 return true;
1130
1131         return false;
1132 }
1133
1134 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1135 {
1136         struct mmc_blk_data *md = mq->data;
1137         struct mmc_card *card = md->queue.card;
1138         unsigned int from, nr, arg;
1139         int err = 0, type = MMC_BLK_DISCARD;
1140
1141         if (!mmc_can_erase(card)) {
1142                 err = -EOPNOTSUPP;
1143                 goto out;
1144         }
1145
1146         from = blk_rq_pos(req);
1147         nr = blk_rq_sectors(req);
1148
1149         if (mmc_can_discard(card))
1150                 arg = MMC_DISCARD_ARG;
1151         else if (mmc_can_trim(card))
1152                 arg = MMC_TRIM_ARG;
1153         else
1154                 arg = MMC_ERASE_ARG;
1155 retry:
1156         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1157                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1158                                  INAND_CMD38_ARG_EXT_CSD,
1159                                  arg == MMC_TRIM_ARG ?
1160                                  INAND_CMD38_ARG_TRIM :
1161                                  INAND_CMD38_ARG_ERASE,
1162                                  0);
1163                 if (err)
1164                         goto out;
1165         }
1166         err = mmc_erase(card, from, nr, arg);
1167 out:
1168         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1169                 goto retry;
1170         if (!err)
1171                 mmc_blk_reset_success(md, type);
1172         blk_end_request(req, err, blk_rq_bytes(req));
1173
1174         return err ? 0 : 1;
1175 }
1176
1177 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1178                                        struct request *req)
1179 {
1180         struct mmc_blk_data *md = mq->data;
1181         struct mmc_card *card = md->queue.card;
1182         unsigned int from, nr, arg;
1183         int err = 0, type = MMC_BLK_SECDISCARD;
1184
1185         if (!(mmc_can_secure_erase_trim(card))) {
1186                 err = -EOPNOTSUPP;
1187                 goto out;
1188         }
1189
1190         from = blk_rq_pos(req);
1191         nr = blk_rq_sectors(req);
1192
1193         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1194                 arg = MMC_SECURE_TRIM1_ARG;
1195         else
1196                 arg = MMC_SECURE_ERASE_ARG;
1197
1198 retry:
1199         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1200                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1201                                  INAND_CMD38_ARG_EXT_CSD,
1202                                  arg == MMC_SECURE_TRIM1_ARG ?
1203                                  INAND_CMD38_ARG_SECTRIM1 :
1204                                  INAND_CMD38_ARG_SECERASE,
1205                                  0);
1206                 if (err)
1207                         goto out_retry;
1208         }
1209
1210         err = mmc_erase(card, from, nr, arg);
1211         if (err == -EIO)
1212                 goto out_retry;
1213         if (err)
1214                 goto out;
1215
1216         if (arg == MMC_SECURE_TRIM1_ARG) {
1217                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1218                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1219                                          INAND_CMD38_ARG_EXT_CSD,
1220                                          INAND_CMD38_ARG_SECTRIM2,
1221                                          0);
1222                         if (err)
1223                                 goto out_retry;
1224                 }
1225
1226                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1227                 if (err == -EIO)
1228                         goto out_retry;
1229                 if (err)
1230                         goto out;
1231         }
1232
1233 out_retry:
1234         if (err && !mmc_blk_reset(md, card->host, type))
1235                 goto retry;
1236         if (!err)
1237                 mmc_blk_reset_success(md, type);
1238 out:
1239         blk_end_request(req, err, blk_rq_bytes(req));
1240
1241         return err ? 0 : 1;
1242 }
1243
1244 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1245 {
1246         struct mmc_blk_data *md = mq->data;
1247         struct mmc_card *card = md->queue.card;
1248         int ret = 0;
1249
1250         ret = mmc_flush_cache(card);
1251         if (ret)
1252                 ret = -EIO;
1253
1254         blk_end_request_all(req, ret);
1255
1256         return ret ? 0 : 1;
1257 }
1258
1259 /*
1260  * Reformat current write as a reliable write, supporting
1261  * both legacy and the enhanced reliable write MMC cards.
1262  * In each transfer we'll handle only as much as a single
1263  * reliable write can handle, thus finish the request in
1264  * partial completions.
1265  */
1266 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1267                                     struct mmc_card *card,
1268                                     struct request *req)
1269 {
1270         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1271                 /* Legacy mode imposes restrictions on transfers. */
1272                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1273                         brq->data.blocks = 1;
1274
1275                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1276                         brq->data.blocks = card->ext_csd.rel_sectors;
1277                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1278                         brq->data.blocks = 1;
1279         }
1280 }
1281
1282 #define CMD_ERRORS                                                      \
1283         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1284          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1285          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1286          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1287          R1_CC_ERROR |          /* Card controller error */             \
1288          R1_ERROR)              /* General/unknown error */
1289
1290 static int mmc_blk_err_check(struct mmc_card *card,
1291                              struct mmc_async_req *areq)
1292 {
1293         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1294                                                     mmc_active);
1295         struct mmc_blk_request *brq = &mq_mrq->brq;
1296         struct request *req = mq_mrq->req;
1297         int need_retune = card->host->need_retune;
1298         int ecc_err = 0, gen_err = 0;
1299
1300         /*
1301          * sbc.error indicates a problem with the set block count
1302          * command.  No data will have been transferred.
1303          *
1304          * cmd.error indicates a problem with the r/w command.  No
1305          * data will have been transferred.
1306          *
1307          * stop.error indicates a problem with the stop command.  Data
1308          * may have been transferred, or may still be transferring.
1309          */
1310         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1311             brq->data.error) {
1312                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1313                 case ERR_RETRY:
1314                         return MMC_BLK_RETRY;
1315                 case ERR_ABORT:
1316                         return MMC_BLK_ABORT;
1317                 case ERR_NOMEDIUM:
1318                         return MMC_BLK_NOMEDIUM;
1319                 case ERR_CONTINUE:
1320                         break;
1321                 }
1322         }
1323
1324         /*
1325          * Check for errors relating to the execution of the
1326          * initial command - such as address errors.  No data
1327          * has been transferred.
1328          */
1329         if (brq->cmd.resp[0] & CMD_ERRORS) {
1330                 pr_err("%s: r/w command failed, status = %#x\n",
1331                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1332                 return MMC_BLK_ABORT;
1333         }
1334
1335         /*
1336          * Everything else is either success, or a data error of some
1337          * kind.  If it was a write, we may have transitioned to
1338          * program mode, which we have to wait for it to complete.
1339          */
1340         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1341                 int err;
1342
1343                 /* Check stop command response */
1344                 if (brq->stop.resp[0] & R1_ERROR) {
1345                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1346                                req->rq_disk->disk_name, __func__,
1347                                brq->stop.resp[0]);
1348                         gen_err = 1;
1349                 }
1350
1351                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1352                                         &gen_err);
1353                 if (err)
1354                         return MMC_BLK_CMD_ERR;
1355         }
1356
1357         /* if general error occurs, retry the write operation. */
1358         if (gen_err) {
1359                 pr_warn("%s: retrying write for general error\n",
1360                                 req->rq_disk->disk_name);
1361                 return MMC_BLK_RETRY;
1362         }
1363
1364         if (brq->data.error) {
1365                 if (need_retune && !brq->retune_retry_done) {
1366                         pr_info("%s: retrying because a re-tune was needed\n",
1367                                 req->rq_disk->disk_name);
1368                         brq->retune_retry_done = 1;
1369                         return MMC_BLK_RETRY;
1370                 }
1371                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1372                        req->rq_disk->disk_name, brq->data.error,
1373                        (unsigned)blk_rq_pos(req),
1374                        (unsigned)blk_rq_sectors(req),
1375                        brq->cmd.resp[0], brq->stop.resp[0]);
1376
1377                 if (rq_data_dir(req) == READ) {
1378                         if (ecc_err)
1379                                 return MMC_BLK_ECC_ERR;
1380                         return MMC_BLK_DATA_ERR;
1381                 } else {
1382                         return MMC_BLK_CMD_ERR;
1383                 }
1384         }
1385
1386         if (!brq->data.bytes_xfered)
1387                 return MMC_BLK_RETRY;
1388
1389         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1390                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1391                         return MMC_BLK_PARTIAL;
1392                 else
1393                         return MMC_BLK_SUCCESS;
1394         }
1395
1396         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1397                 return MMC_BLK_PARTIAL;
1398
1399         return MMC_BLK_SUCCESS;
1400 }
1401
1402 static int mmc_blk_packed_err_check(struct mmc_card *card,
1403                                     struct mmc_async_req *areq)
1404 {
1405         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1406                         mmc_active);
1407         struct request *req = mq_rq->req;
1408         struct mmc_packed *packed = mq_rq->packed;
1409         int err, check, status;
1410         u8 *ext_csd;
1411
1412         BUG_ON(!packed);
1413
1414         packed->retries--;
1415         check = mmc_blk_err_check(card, areq);
1416         err = get_card_status(card, &status, 0);
1417         if (err) {
1418                 pr_err("%s: error %d sending status command\n",
1419                        req->rq_disk->disk_name, err);
1420                 return MMC_BLK_ABORT;
1421         }
1422
1423         if (status & R1_EXCEPTION_EVENT) {
1424                 err = mmc_get_ext_csd(card, &ext_csd);
1425                 if (err) {
1426                         pr_err("%s: error %d sending ext_csd\n",
1427                                req->rq_disk->disk_name, err);
1428                         return MMC_BLK_ABORT;
1429                 }
1430
1431                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1432                      EXT_CSD_PACKED_FAILURE) &&
1433                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1434                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1435                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1436                             EXT_CSD_PACKED_INDEXED_ERROR) {
1437                                 packed->idx_failure =
1438                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1439                                 check = MMC_BLK_PARTIAL;
1440                         }
1441                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1442                                "failure index: %d\n",
1443                                req->rq_disk->disk_name, packed->nr_entries,
1444                                packed->blocks, packed->idx_failure);
1445                 }
1446                 kfree(ext_csd);
1447         }
1448
1449         return check;
1450 }
1451
1452 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1453                                struct mmc_card *card,
1454                                int disable_multi,
1455                                struct mmc_queue *mq)
1456 {
1457         u32 readcmd, writecmd;
1458         struct mmc_blk_request *brq = &mqrq->brq;
1459         struct request *req = mqrq->req;
1460         struct mmc_blk_data *md = mq->data;
1461         bool do_data_tag;
1462
1463         /*
1464          * Reliable writes are used to implement Forced Unit Access and
1465          * are supported only on MMCs.
1466          */
1467         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1468                 (rq_data_dir(req) == WRITE) &&
1469                 (md->flags & MMC_BLK_REL_WR);
1470
1471         memset(brq, 0, sizeof(struct mmc_blk_request));
1472         brq->mrq.cmd = &brq->cmd;
1473         brq->mrq.data = &brq->data;
1474
1475         brq->cmd.arg = blk_rq_pos(req);
1476         if (!mmc_card_blockaddr(card))
1477                 brq->cmd.arg <<= 9;
1478         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1479         brq->data.blksz = 512;
1480         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1481         brq->stop.arg = 0;
1482         brq->data.blocks = blk_rq_sectors(req);
1483
1484         /*
1485          * The block layer doesn't support all sector count
1486          * restrictions, so we need to be prepared for too big
1487          * requests.
1488          */
1489         if (brq->data.blocks > card->host->max_blk_count)
1490                 brq->data.blocks = card->host->max_blk_count;
1491
1492         if (brq->data.blocks > 1) {
1493                 /*
1494                  * After a read error, we redo the request one sector
1495                  * at a time in order to accurately determine which
1496                  * sectors can be read successfully.
1497                  */
1498                 if (disable_multi)
1499                         brq->data.blocks = 1;
1500
1501                 /*
1502                  * Some controllers have HW issues while operating
1503                  * in multiple I/O mode
1504                  */
1505                 if (card->host->ops->multi_io_quirk)
1506                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1507                                                 (rq_data_dir(req) == READ) ?
1508                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1509                                                 brq->data.blocks);
1510         }
1511
1512         if (brq->data.blocks > 1 || do_rel_wr) {
1513                 /* SPI multiblock writes terminate using a special
1514                  * token, not a STOP_TRANSMISSION request.
1515                  */
1516                 if (!mmc_host_is_spi(card->host) ||
1517                     rq_data_dir(req) == READ)
1518                         brq->mrq.stop = &brq->stop;
1519                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1520                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1521         } else {
1522                 brq->mrq.stop = NULL;
1523                 readcmd = MMC_READ_SINGLE_BLOCK;
1524                 writecmd = MMC_WRITE_BLOCK;
1525         }
1526         if (rq_data_dir(req) == READ) {
1527                 brq->cmd.opcode = readcmd;
1528                 brq->data.flags |= MMC_DATA_READ;
1529                 if (brq->mrq.stop)
1530                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1531                                         MMC_CMD_AC;
1532         } else {
1533                 brq->cmd.opcode = writecmd;
1534                 brq->data.flags |= MMC_DATA_WRITE;
1535                 if (brq->mrq.stop)
1536                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1537                                         MMC_CMD_AC;
1538         }
1539
1540         if (do_rel_wr)
1541                 mmc_apply_rel_rw(brq, card, req);
1542
1543         /*
1544          * Data tag is used only during writing meta data to speed
1545          * up write and any subsequent read of this meta data
1546          */
1547         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1548                 (req->cmd_flags & REQ_META) &&
1549                 (rq_data_dir(req) == WRITE) &&
1550                 ((brq->data.blocks * brq->data.blksz) >=
1551                  card->ext_csd.data_tag_unit_size);
1552
1553         /*
1554          * Pre-defined multi-block transfers are preferable to
1555          * open ended-ones (and necessary for reliable writes).
1556          * However, it is not sufficient to just send CMD23,
1557          * and avoid the final CMD12, as on an error condition
1558          * CMD12 (stop) needs to be sent anyway. This, coupled
1559          * with Auto-CMD23 enhancements provided by some
1560          * hosts, means that the complexity of dealing
1561          * with this is best left to the host. If CMD23 is
1562          * supported by card and host, we'll fill sbc in and let
1563          * the host deal with handling it correctly. This means
1564          * that for hosts that don't expose MMC_CAP_CMD23, no
1565          * change of behavior will be observed.
1566          *
1567          * N.B: Some MMC cards experience perf degradation.
1568          * We'll avoid using CMD23-bounded multiblock writes for
1569          * these, while retaining features like reliable writes.
1570          */
1571         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1572             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1573              do_data_tag)) {
1574                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1575                 brq->sbc.arg = brq->data.blocks |
1576                         (do_rel_wr ? (1 << 31) : 0) |
1577                         (do_data_tag ? (1 << 29) : 0);
1578                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1579                 brq->mrq.sbc = &brq->sbc;
1580         }
1581
1582         mmc_set_data_timeout(&brq->data, card);
1583
1584         brq->data.sg = mqrq->sg;
1585         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1586
1587         /*
1588          * Adjust the sg list so it is the same size as the
1589          * request.
1590          */
1591         if (brq->data.blocks != blk_rq_sectors(req)) {
1592                 int i, data_size = brq->data.blocks << 9;
1593                 struct scatterlist *sg;
1594
1595                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1596                         data_size -= sg->length;
1597                         if (data_size <= 0) {
1598                                 sg->length += data_size;
1599                                 i++;
1600                                 break;
1601                         }
1602                 }
1603                 brq->data.sg_len = i;
1604         }
1605
1606         mqrq->mmc_active.mrq = &brq->mrq;
1607         mqrq->mmc_active.err_check = mmc_blk_err_check;
1608
1609         mmc_queue_bounce_pre(mqrq);
1610 }
1611
1612 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1613                                           struct mmc_card *card)
1614 {
1615         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1616         unsigned int max_seg_sz = queue_max_segment_size(q);
1617         unsigned int len, nr_segs = 0;
1618
1619         do {
1620                 len = min(hdr_sz, max_seg_sz);
1621                 hdr_sz -= len;
1622                 nr_segs++;
1623         } while (hdr_sz);
1624
1625         return nr_segs;
1626 }
1627
1628 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1629 {
1630         struct request_queue *q = mq->queue;
1631         struct mmc_card *card = mq->card;
1632         struct request *cur = req, *next = NULL;
1633         struct mmc_blk_data *md = mq->data;
1634         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1635         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1636         unsigned int req_sectors = 0, phys_segments = 0;
1637         unsigned int max_blk_count, max_phys_segs;
1638         bool put_back = true;
1639         u8 max_packed_rw = 0;
1640         u8 reqs = 0;
1641
1642         if (!(md->flags & MMC_BLK_PACKED_CMD))
1643                 goto no_packed;
1644
1645         if ((rq_data_dir(cur) == WRITE) &&
1646             mmc_host_packed_wr(card->host))
1647                 max_packed_rw = card->ext_csd.max_packed_writes;
1648
1649         if (max_packed_rw == 0)
1650                 goto no_packed;
1651
1652         if (mmc_req_rel_wr(cur) &&
1653             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1654                 goto no_packed;
1655
1656         if (mmc_large_sector(card) &&
1657             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1658                 goto no_packed;
1659
1660         mmc_blk_clear_packed(mqrq);
1661
1662         max_blk_count = min(card->host->max_blk_count,
1663                             card->host->max_req_size >> 9);
1664         if (unlikely(max_blk_count > 0xffff))
1665                 max_blk_count = 0xffff;
1666
1667         max_phys_segs = queue_max_segments(q);
1668         req_sectors += blk_rq_sectors(cur);
1669         phys_segments += cur->nr_phys_segments;
1670
1671         if (rq_data_dir(cur) == WRITE) {
1672                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1673                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1674         }
1675
1676         do {
1677                 if (reqs >= max_packed_rw - 1) {
1678                         put_back = false;
1679                         break;
1680                 }
1681
1682                 spin_lock_irq(q->queue_lock);
1683                 next = blk_fetch_request(q);
1684                 spin_unlock_irq(q->queue_lock);
1685                 if (!next) {
1686                         put_back = false;
1687                         break;
1688                 }
1689
1690                 if (mmc_large_sector(card) &&
1691                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1692                         break;
1693
1694                 if (next->cmd_flags & REQ_DISCARD ||
1695                     next->cmd_flags & REQ_FLUSH)
1696                         break;
1697
1698                 if (rq_data_dir(cur) != rq_data_dir(next))
1699                         break;
1700
1701                 if (mmc_req_rel_wr(next) &&
1702                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1703                         break;
1704
1705                 req_sectors += blk_rq_sectors(next);
1706                 if (req_sectors > max_blk_count)
1707                         break;
1708
1709                 phys_segments +=  next->nr_phys_segments;
1710                 if (phys_segments > max_phys_segs)
1711                         break;
1712
1713                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1714                 cur = next;
1715                 reqs++;
1716         } while (1);
1717
1718         if (put_back) {
1719                 spin_lock_irq(q->queue_lock);
1720                 blk_requeue_request(q, next);
1721                 spin_unlock_irq(q->queue_lock);
1722         }
1723
1724         if (reqs > 0) {
1725                 list_add(&req->queuelist, &mqrq->packed->list);
1726                 mqrq->packed->nr_entries = ++reqs;
1727                 mqrq->packed->retries = reqs;
1728                 return reqs;
1729         }
1730
1731 no_packed:
1732         mqrq->cmd_type = MMC_PACKED_NONE;
1733         return 0;
1734 }
1735
1736 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1737                                         struct mmc_card *card,
1738                                         struct mmc_queue *mq)
1739 {
1740         struct mmc_blk_request *brq = &mqrq->brq;
1741         struct request *req = mqrq->req;
1742         struct request *prq;
1743         struct mmc_blk_data *md = mq->data;
1744         struct mmc_packed *packed = mqrq->packed;
1745         bool do_rel_wr, do_data_tag;
1746         u32 *packed_cmd_hdr;
1747         u8 hdr_blocks;
1748         u8 i = 1;
1749
1750         BUG_ON(!packed);
1751
1752         mqrq->cmd_type = MMC_PACKED_WRITE;
1753         packed->blocks = 0;
1754         packed->idx_failure = MMC_PACKED_NR_IDX;
1755
1756         packed_cmd_hdr = packed->cmd_hdr;
1757         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1758         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1759                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1760         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1761
1762         /*
1763          * Argument for each entry of packed group
1764          */
1765         list_for_each_entry(prq, &packed->list, queuelist) {
1766                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1767                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1768                         (prq->cmd_flags & REQ_META) &&
1769                         (rq_data_dir(prq) == WRITE) &&
1770                         ((brq->data.blocks * brq->data.blksz) >=
1771                          card->ext_csd.data_tag_unit_size);
1772                 /* Argument of CMD23 */
1773                 packed_cmd_hdr[(i * 2)] =
1774                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1775                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1776                         blk_rq_sectors(prq);
1777                 /* Argument of CMD18 or CMD25 */
1778                 packed_cmd_hdr[((i * 2)) + 1] =
1779                         mmc_card_blockaddr(card) ?
1780                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1781                 packed->blocks += blk_rq_sectors(prq);
1782                 i++;
1783         }
1784
1785         memset(brq, 0, sizeof(struct mmc_blk_request));
1786         brq->mrq.cmd = &brq->cmd;
1787         brq->mrq.data = &brq->data;
1788         brq->mrq.sbc = &brq->sbc;
1789         brq->mrq.stop = &brq->stop;
1790
1791         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1792         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1793         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1794
1795         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1796         brq->cmd.arg = blk_rq_pos(req);
1797         if (!mmc_card_blockaddr(card))
1798                 brq->cmd.arg <<= 9;
1799         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1800
1801         brq->data.blksz = 512;
1802         brq->data.blocks = packed->blocks + hdr_blocks;
1803         brq->data.flags |= MMC_DATA_WRITE;
1804
1805         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1806         brq->stop.arg = 0;
1807         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1808
1809         mmc_set_data_timeout(&brq->data, card);
1810
1811         brq->data.sg = mqrq->sg;
1812         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1813
1814         mqrq->mmc_active.mrq = &brq->mrq;
1815         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1816
1817         mmc_queue_bounce_pre(mqrq);
1818 }
1819
1820 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1821                            struct mmc_blk_request *brq, struct request *req,
1822                            int ret)
1823 {
1824         struct mmc_queue_req *mq_rq;
1825         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1826
1827         /*
1828          * If this is an SD card and we're writing, we can first
1829          * mark the known good sectors as ok.
1830          *
1831          * If the card is not SD, we can still ok written sectors
1832          * as reported by the controller (which might be less than
1833          * the real number of written sectors, but never more).
1834          */
1835         if (mmc_card_sd(card)) {
1836                 u32 blocks;
1837
1838                 blocks = mmc_sd_num_wr_blocks(card);
1839                 if (blocks != (u32)-1) {
1840                         ret = blk_end_request(req, 0, blocks << 9);
1841                 }
1842         } else {
1843                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1844                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1845         }
1846         return ret;
1847 }
1848
1849 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1850 {
1851         struct request *prq;
1852         struct mmc_packed *packed = mq_rq->packed;
1853         int idx = packed->idx_failure, i = 0;
1854         int ret = 0;
1855
1856         BUG_ON(!packed);
1857
1858         while (!list_empty(&packed->list)) {
1859                 prq = list_entry_rq(packed->list.next);
1860                 if (idx == i) {
1861                         /* retry from error index */
1862                         packed->nr_entries -= idx;
1863                         mq_rq->req = prq;
1864                         ret = 1;
1865
1866                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1867                                 list_del_init(&prq->queuelist);
1868                                 mmc_blk_clear_packed(mq_rq);
1869                         }
1870                         return ret;
1871                 }
1872                 list_del_init(&prq->queuelist);
1873                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1874                 i++;
1875         }
1876
1877         mmc_blk_clear_packed(mq_rq);
1878         return ret;
1879 }
1880
1881 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1882 {
1883         struct request *prq;
1884         struct mmc_packed *packed = mq_rq->packed;
1885
1886         BUG_ON(!packed);
1887
1888         while (!list_empty(&packed->list)) {
1889                 prq = list_entry_rq(packed->list.next);
1890                 list_del_init(&prq->queuelist);
1891                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1892         }
1893
1894         mmc_blk_clear_packed(mq_rq);
1895 }
1896
1897 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1898                                       struct mmc_queue_req *mq_rq)
1899 {
1900         struct request *prq;
1901         struct request_queue *q = mq->queue;
1902         struct mmc_packed *packed = mq_rq->packed;
1903
1904         BUG_ON(!packed);
1905
1906         while (!list_empty(&packed->list)) {
1907                 prq = list_entry_rq(packed->list.prev);
1908                 if (prq->queuelist.prev != &packed->list) {
1909                         list_del_init(&prq->queuelist);
1910                         spin_lock_irq(q->queue_lock);
1911                         blk_requeue_request(mq->queue, prq);
1912                         spin_unlock_irq(q->queue_lock);
1913                 } else {
1914                         list_del_init(&prq->queuelist);
1915                 }
1916         }
1917
1918         mmc_blk_clear_packed(mq_rq);
1919 }
1920
1921 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1922 {
1923         struct mmc_blk_data *md = mq->data;
1924         struct mmc_card *card = md->queue.card;
1925         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1926         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1927         enum mmc_blk_status status;
1928         struct mmc_queue_req *mq_rq;
1929         struct request *req = rqc;
1930         struct mmc_async_req *areq;
1931         const u8 packed_nr = 2;
1932         u8 reqs = 0;
1933
1934         if (!rqc && !mq->mqrq_prev->req)
1935                 return 0;
1936
1937         if (rqc)
1938                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1939
1940         do {
1941                 if (rqc) {
1942                         /*
1943                          * When 4KB native sector is enabled, only 8 blocks
1944                          * multiple read or write is allowed
1945                          */
1946                         if ((brq->data.blocks & 0x07) &&
1947                             (card->ext_csd.data_sector_size == 4096)) {
1948                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1949                                         req->rq_disk->disk_name);
1950                                 mq_rq = mq->mqrq_cur;
1951                                 goto cmd_abort;
1952                         }
1953
1954                         if (reqs >= packed_nr)
1955                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1956                                                             card, mq);
1957                         else
1958                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1959                         areq = &mq->mqrq_cur->mmc_active;
1960                 } else
1961                         areq = NULL;
1962                 areq = mmc_start_req(card->host, areq, (int *) &status);
1963                 if (!areq) {
1964                         if (status == MMC_BLK_NEW_REQUEST)
1965                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1966                         return 0;
1967                 }
1968
1969                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1970                 brq = &mq_rq->brq;
1971                 req = mq_rq->req;
1972                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1973                 mmc_queue_bounce_post(mq_rq);
1974
1975                 switch (status) {
1976                 case MMC_BLK_SUCCESS:
1977                 case MMC_BLK_PARTIAL:
1978                         /*
1979                          * A block was successfully transferred.
1980                          */
1981                         mmc_blk_reset_success(md, type);
1982
1983                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1984                                 ret = mmc_blk_end_packed_req(mq_rq);
1985                                 break;
1986                         } else {
1987                                 ret = blk_end_request(req, 0,
1988                                                 brq->data.bytes_xfered);
1989                         }
1990
1991                         /*
1992                          * If the blk_end_request function returns non-zero even
1993                          * though all data has been transferred and no errors
1994                          * were returned by the host controller, it's a bug.
1995                          */
1996                         if (status == MMC_BLK_SUCCESS && ret) {
1997                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1998                                        __func__, blk_rq_bytes(req),
1999                                        brq->data.bytes_xfered);
2000                                 rqc = NULL;
2001                                 goto cmd_abort;
2002                         }
2003                         break;
2004                 case MMC_BLK_CMD_ERR:
2005                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2006                         if (mmc_blk_reset(md, card->host, type))
2007                                 goto cmd_abort;
2008                         if (!ret)
2009                                 goto start_new_req;
2010                         break;
2011                 case MMC_BLK_RETRY:
2012                         retune_retry_done = brq->retune_retry_done;
2013                         if (retry++ < 5)
2014                                 break;
2015                         /* Fall through */
2016                 case MMC_BLK_ABORT:
2017                         if (!mmc_blk_reset(md, card->host, type))
2018                                 break;
2019                         goto cmd_abort;
2020                 case MMC_BLK_DATA_ERR: {
2021                         int err;
2022
2023                         err = mmc_blk_reset(md, card->host, type);
2024                         if (!err)
2025                                 break;
2026                         if (err == -ENODEV ||
2027                                 mmc_packed_cmd(mq_rq->cmd_type))
2028                                 goto cmd_abort;
2029                         /* Fall through */
2030                 }
2031                 case MMC_BLK_ECC_ERR:
2032                         if (brq->data.blocks > 1) {
2033                                 /* Redo read one sector at a time */
2034                                 pr_warn("%s: retrying using single block read\n",
2035                                         req->rq_disk->disk_name);
2036                                 disable_multi = 1;
2037                                 break;
2038                         }
2039                         /*
2040                          * After an error, we redo I/O one sector at a
2041                          * time, so we only reach here after trying to
2042                          * read a single sector.
2043                          */
2044                         ret = blk_end_request(req, -EIO,
2045                                                 brq->data.blksz);
2046                         if (!ret)
2047                                 goto start_new_req;
2048                         break;
2049                 case MMC_BLK_NOMEDIUM:
2050                         goto cmd_abort;
2051                 default:
2052                         pr_err("%s: Unhandled return value (%d)",
2053                                         req->rq_disk->disk_name, status);
2054                         goto cmd_abort;
2055                 }
2056
2057                 if (ret) {
2058                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2059                                 if (!mq_rq->packed->retries)
2060                                         goto cmd_abort;
2061                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2062                                 mmc_start_req(card->host,
2063                                               &mq_rq->mmc_active, NULL);
2064                         } else {
2065
2066                                 /*
2067                                  * In case of a incomplete request
2068                                  * prepare it again and resend.
2069                                  */
2070                                 mmc_blk_rw_rq_prep(mq_rq, card,
2071                                                 disable_multi, mq);
2072                                 mmc_start_req(card->host,
2073                                                 &mq_rq->mmc_active, NULL);
2074                         }
2075                         mq_rq->brq.retune_retry_done = retune_retry_done;
2076                 }
2077         } while (ret);
2078
2079         return 1;
2080
2081  cmd_abort:
2082         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2083                 mmc_blk_abort_packed_req(mq_rq);
2084         } else {
2085                 if (mmc_card_removed(card))
2086                         req->cmd_flags |= REQ_QUIET;
2087                 while (ret)
2088                         ret = blk_end_request(req, -EIO,
2089                                         blk_rq_cur_bytes(req));
2090         }
2091
2092  start_new_req:
2093         if (rqc) {
2094                 if (mmc_card_removed(card)) {
2095                         rqc->cmd_flags |= REQ_QUIET;
2096                         blk_end_request_all(rqc, -EIO);
2097                 } else {
2098                         /*
2099                          * If current request is packed, it needs to put back.
2100                          */
2101                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2102                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2103
2104                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2105                         mmc_start_req(card->host,
2106                                       &mq->mqrq_cur->mmc_active, NULL);
2107                 }
2108         }
2109
2110         return 0;
2111 }
2112
2113 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2114 {
2115         int ret;
2116         struct mmc_blk_data *md = mq->data;
2117         struct mmc_card *card = md->queue.card;
2118         struct mmc_host *host = card->host;
2119         unsigned long flags;
2120         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2121
2122         if (req && !mq->mqrq_prev->req)
2123                 /* claim host only for the first request */
2124                 mmc_get_card(card);
2125
2126         ret = mmc_blk_part_switch(card, md);
2127         if (ret) {
2128                 if (req) {
2129                         blk_end_request_all(req, -EIO);
2130                 }
2131                 ret = 0;
2132                 goto out;
2133         }
2134
2135         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2136         if (cmd_flags & REQ_DISCARD) {
2137                 /* complete ongoing async transfer before issuing discard */
2138                 if (card->host->areq)
2139                         mmc_blk_issue_rw_rq(mq, NULL);
2140                 if (req->cmd_flags & REQ_SECURE)
2141                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2142                 else
2143                         ret = mmc_blk_issue_discard_rq(mq, req);
2144         } else if (cmd_flags & REQ_FLUSH) {
2145                 /* complete ongoing async transfer before issuing flush */
2146                 if (card->host->areq)
2147                         mmc_blk_issue_rw_rq(mq, NULL);
2148                 ret = mmc_blk_issue_flush(mq, req);
2149         } else {
2150                 if (!req && host->areq) {
2151                         spin_lock_irqsave(&host->context_info.lock, flags);
2152                         host->context_info.is_waiting_last_req = true;
2153                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2154                 }
2155                 ret = mmc_blk_issue_rw_rq(mq, req);
2156         }
2157
2158 out:
2159         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2160              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2161                 /*
2162                  * Release host when there are no more requests
2163                  * and after special request(discard, flush) is done.
2164                  * In case sepecial request, there is no reentry to
2165                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2166                  */
2167                 mmc_put_card(card);
2168         return ret;
2169 }
2170
2171 static inline int mmc_blk_readonly(struct mmc_card *card)
2172 {
2173         return mmc_card_readonly(card) ||
2174                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2175 }
2176
2177 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2178                                               struct device *parent,
2179                                               sector_t size,
2180                                               bool default_ro,
2181                                               const char *subname,
2182                                               int area_type)
2183 {
2184         struct mmc_blk_data *md;
2185         int devidx, ret;
2186
2187         devidx = find_first_zero_bit(dev_use, max_devices);
2188         if (devidx >= max_devices)
2189                 return ERR_PTR(-ENOSPC);
2190         __set_bit(devidx, dev_use);
2191
2192         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2193         if (!md) {
2194                 ret = -ENOMEM;
2195                 goto out;
2196         }
2197
2198         /*
2199          * !subname implies we are creating main mmc_blk_data that will be
2200          * associated with mmc_card with dev_set_drvdata. Due to device
2201          * partitions, devidx will not coincide with a per-physical card
2202          * index anymore so we keep track of a name index.
2203          */
2204         if (!subname) {
2205                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2206                 __set_bit(md->name_idx, name_use);
2207         } else
2208                 md->name_idx = ((struct mmc_blk_data *)
2209                                 dev_to_disk(parent)->private_data)->name_idx;
2210
2211         md->area_type = area_type;
2212
2213         /*
2214          * Set the read-only status based on the supported commands
2215          * and the write protect switch.
2216          */
2217         md->read_only = mmc_blk_readonly(card);
2218
2219         md->disk = alloc_disk(perdev_minors);
2220         if (md->disk == NULL) {
2221                 ret = -ENOMEM;
2222                 goto err_kfree;
2223         }
2224
2225         spin_lock_init(&md->lock);
2226         INIT_LIST_HEAD(&md->part);
2227         md->usage = 1;
2228
2229         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2230         if (ret)
2231                 goto err_putdisk;
2232
2233         md->queue.issue_fn = mmc_blk_issue_rq;
2234         md->queue.data = md;
2235
2236         md->disk->major = MMC_BLOCK_MAJOR;
2237         md->disk->first_minor = devidx * perdev_minors;
2238         md->disk->fops = &mmc_bdops;
2239         md->disk->private_data = md;
2240         md->disk->queue = md->queue.queue;
2241         md->disk->driverfs_dev = parent;
2242         set_disk_ro(md->disk, md->read_only || default_ro);
2243         md->disk->flags = GENHD_FL_EXT_DEVT;
2244         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2245                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2246
2247         /*
2248          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2249          *
2250          * - be set for removable media with permanent block devices
2251          * - be unset for removable block devices with permanent media
2252          *
2253          * Since MMC block devices clearly fall under the second
2254          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2255          * should use the block device creation/destruction hotplug
2256          * messages to tell when the card is present.
2257          */
2258
2259         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2260                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2261
2262         if (mmc_card_mmc(card))
2263                 blk_queue_logical_block_size(md->queue.queue,
2264                                              card->ext_csd.data_sector_size);
2265         else
2266                 blk_queue_logical_block_size(md->queue.queue, 512);
2267
2268         set_capacity(md->disk, size);
2269
2270         if (mmc_host_cmd23(card->host)) {
2271                 if (mmc_card_mmc(card) ||
2272                     (mmc_card_sd(card) &&
2273                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2274                         md->flags |= MMC_BLK_CMD23;
2275         }
2276
2277         if (mmc_card_mmc(card) &&
2278             md->flags & MMC_BLK_CMD23 &&
2279             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2280              card->ext_csd.rel_sectors)) {
2281                 md->flags |= MMC_BLK_REL_WR;
2282                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2283         }
2284
2285         if (mmc_card_mmc(card) &&
2286             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2287             (md->flags & MMC_BLK_CMD23) &&
2288             card->ext_csd.packed_event_en) {
2289                 if (!mmc_packed_init(&md->queue, card))
2290                         md->flags |= MMC_BLK_PACKED_CMD;
2291         }
2292
2293         return md;
2294
2295  err_putdisk:
2296         put_disk(md->disk);
2297  err_kfree:
2298         kfree(md);
2299  out:
2300         return ERR_PTR(ret);
2301 }
2302
2303 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2304 {
2305         sector_t size;
2306
2307         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2308                 /*
2309                  * The EXT_CSD sector count is in number or 512 byte
2310                  * sectors.
2311                  */
2312                 size = card->ext_csd.sectors;
2313         } else {
2314                 /*
2315                  * The CSD capacity field is in units of read_blkbits.
2316                  * set_capacity takes units of 512 bytes.
2317                  */
2318                 size = (typeof(sector_t))card->csd.capacity
2319                         << (card->csd.read_blkbits - 9);
2320         }
2321
2322         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2323                                         MMC_BLK_DATA_AREA_MAIN);
2324 }
2325
2326 static int mmc_blk_alloc_part(struct mmc_card *card,
2327                               struct mmc_blk_data *md,
2328                               unsigned int part_type,
2329                               sector_t size,
2330                               bool default_ro,
2331                               const char *subname,
2332                               int area_type)
2333 {
2334         char cap_str[10];
2335         struct mmc_blk_data *part_md;
2336
2337         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2338                                     subname, area_type);
2339         if (IS_ERR(part_md))
2340                 return PTR_ERR(part_md);
2341         part_md->part_type = part_type;
2342         list_add(&part_md->part, &md->part);
2343
2344         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2345                         cap_str, sizeof(cap_str));
2346         pr_info("%s: %s %s partition %u %s\n",
2347                part_md->disk->disk_name, mmc_card_id(card),
2348                mmc_card_name(card), part_md->part_type, cap_str);
2349         return 0;
2350 }
2351
2352 /* MMC Physical partitions consist of two boot partitions and
2353  * up to four general purpose partitions.
2354  * For each partition enabled in EXT_CSD a block device will be allocatedi
2355  * to provide access to the partition.
2356  */
2357
2358 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2359 {
2360         int idx, ret = 0;
2361
2362         if (!mmc_card_mmc(card))
2363                 return 0;
2364
2365         for (idx = 0; idx < card->nr_parts; idx++) {
2366                 if (card->part[idx].size) {
2367                         ret = mmc_blk_alloc_part(card, md,
2368                                 card->part[idx].part_cfg,
2369                                 card->part[idx].size >> 9,
2370                                 card->part[idx].force_ro,
2371                                 card->part[idx].name,
2372                                 card->part[idx].area_type);
2373                         if (ret)
2374                                 return ret;
2375                 }
2376         }
2377
2378         return ret;
2379 }
2380
2381 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2382 {
2383         struct mmc_card *card;
2384
2385         if (md) {
2386                 /*
2387                  * Flush remaining requests and free queues. It
2388                  * is freeing the queue that stops new requests
2389                  * from being accepted.
2390                  */
2391                 card = md->queue.card;
2392                 mmc_cleanup_queue(&md->queue);
2393                 if (md->flags & MMC_BLK_PACKED_CMD)
2394                         mmc_packed_clean(&md->queue);
2395                 if (md->disk->flags & GENHD_FL_UP) {
2396                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2397                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2398                                         card->ext_csd.boot_ro_lockable)
2399                                 device_remove_file(disk_to_dev(md->disk),
2400                                         &md->power_ro_lock);
2401
2402                         del_gendisk(md->disk);
2403                 }
2404                 mmc_blk_put(md);
2405         }
2406 }
2407
2408 static void mmc_blk_remove_parts(struct mmc_card *card,
2409                                  struct mmc_blk_data *md)
2410 {
2411         struct list_head *pos, *q;
2412         struct mmc_blk_data *part_md;
2413
2414         __clear_bit(md->name_idx, name_use);
2415         list_for_each_safe(pos, q, &md->part) {
2416                 part_md = list_entry(pos, struct mmc_blk_data, part);
2417                 list_del(pos);
2418                 mmc_blk_remove_req(part_md);
2419         }
2420 }
2421
2422 static int mmc_add_disk(struct mmc_blk_data *md)
2423 {
2424         int ret;
2425         struct mmc_card *card = md->queue.card;
2426
2427         add_disk(md->disk);
2428         md->force_ro.show = force_ro_show;
2429         md->force_ro.store = force_ro_store;
2430         sysfs_attr_init(&md->force_ro.attr);
2431         md->force_ro.attr.name = "force_ro";
2432         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2433         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2434         if (ret)
2435                 goto force_ro_fail;
2436
2437         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2438              card->ext_csd.boot_ro_lockable) {
2439                 umode_t mode;
2440
2441                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2442                         mode = S_IRUGO;
2443                 else
2444                         mode = S_IRUGO | S_IWUSR;
2445
2446                 md->power_ro_lock.show = power_ro_lock_show;
2447                 md->power_ro_lock.store = power_ro_lock_store;
2448                 sysfs_attr_init(&md->power_ro_lock.attr);
2449                 md->power_ro_lock.attr.mode = mode;
2450                 md->power_ro_lock.attr.name =
2451                                         "ro_lock_until_next_power_on";
2452                 ret = device_create_file(disk_to_dev(md->disk),
2453                                 &md->power_ro_lock);
2454                 if (ret)
2455                         goto power_ro_lock_fail;
2456         }
2457         return ret;
2458
2459 power_ro_lock_fail:
2460         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2461 force_ro_fail:
2462         del_gendisk(md->disk);
2463
2464         return ret;
2465 }
2466
2467 #define CID_MANFID_SANDISK      0x2
2468 #define CID_MANFID_TOSHIBA      0x11
2469 #define CID_MANFID_MICRON       0x13
2470 #define CID_MANFID_SAMSUNG      0x15
2471 #define CID_MANFID_KINGSTON     0x70
2472
2473 static const struct mmc_fixup blk_fixups[] =
2474 {
2475         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2476                   MMC_QUIRK_INAND_CMD38),
2477         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2478                   MMC_QUIRK_INAND_CMD38),
2479         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2480                   MMC_QUIRK_INAND_CMD38),
2481         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2482                   MMC_QUIRK_INAND_CMD38),
2483         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2484                   MMC_QUIRK_INAND_CMD38),
2485
2486         /*
2487          * Some MMC cards experience performance degradation with CMD23
2488          * instead of CMD12-bounded multiblock transfers. For now we'll
2489          * black list what's bad...
2490          * - Certain Toshiba cards.
2491          *
2492          * N.B. This doesn't affect SD cards.
2493          */
2494         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2495                   MMC_QUIRK_BLK_NO_CMD23),
2496         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2497                   MMC_QUIRK_BLK_NO_CMD23),
2498         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2499                   MMC_QUIRK_BLK_NO_CMD23),
2500         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2501                   MMC_QUIRK_BLK_NO_CMD23),
2502         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2503                   MMC_QUIRK_BLK_NO_CMD23),
2504
2505         /*
2506          * Some Micron MMC cards needs longer data read timeout than
2507          * indicated in CSD.
2508          */
2509         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2510                   MMC_QUIRK_LONG_READ_TIME),
2511
2512         /*
2513          * On these Samsung MoviNAND parts, performing secure erase or
2514          * secure trim can result in unrecoverable corruption due to a
2515          * firmware bug.
2516          */
2517         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2518                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2519         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2520                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2521         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2522                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2523         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2524                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2525         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2526                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2527         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2528                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2529         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2530                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2531         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2532                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2533
2534         /*
2535          *  On Some Kingston eMMCs, performing trim can result in
2536          *  unrecoverable data conrruption occasionally due to a firmware bug.
2537          */
2538         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2539                   MMC_QUIRK_TRIM_BROKEN),
2540         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2541                   MMC_QUIRK_TRIM_BROKEN),
2542
2543         END_FIXUP
2544 };
2545
2546 static int mmc_blk_probe(struct mmc_card *card)
2547 {
2548         struct mmc_blk_data *md, *part_md;
2549         char cap_str[10];
2550
2551         /*
2552          * Check that the card supports the command class(es) we need.
2553          */
2554         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2555                 return -ENODEV;
2556
2557         mmc_fixup_device(card, blk_fixups);
2558
2559         md = mmc_blk_alloc(card);
2560         if (IS_ERR(md))
2561                 return PTR_ERR(md);
2562
2563         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2564                         cap_str, sizeof(cap_str));
2565         pr_info("%s: %s %s %s %s\n",
2566                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2567                 cap_str, md->read_only ? "(ro)" : "");
2568
2569         if (mmc_blk_alloc_parts(card, md))
2570                 goto out;
2571
2572         dev_set_drvdata(&card->dev, md);
2573
2574         if (mmc_add_disk(md))
2575                 goto out;
2576
2577         list_for_each_entry(part_md, &md->part, part) {
2578                 if (mmc_add_disk(part_md))
2579                         goto out;
2580         }
2581
2582         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2583         pm_runtime_use_autosuspend(&card->dev);
2584
2585         /*
2586          * Don't enable runtime PM for SD-combo cards here. Leave that
2587          * decision to be taken during the SDIO init sequence instead.
2588          */
2589         if (card->type != MMC_TYPE_SD_COMBO) {
2590                 pm_runtime_set_active(&card->dev);
2591                 pm_runtime_enable(&card->dev);
2592         }
2593
2594         return 0;
2595
2596  out:
2597         mmc_blk_remove_parts(card, md);
2598         mmc_blk_remove_req(md);
2599         return 0;
2600 }
2601
2602 static void mmc_blk_remove(struct mmc_card *card)
2603 {
2604         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2605
2606         mmc_blk_remove_parts(card, md);
2607         pm_runtime_get_sync(&card->dev);
2608         mmc_claim_host(card->host);
2609         mmc_blk_part_switch(card, md);
2610         mmc_release_host(card->host);
2611         if (card->type != MMC_TYPE_SD_COMBO)
2612                 pm_runtime_disable(&card->dev);
2613         pm_runtime_put_noidle(&card->dev);
2614         mmc_blk_remove_req(md);
2615         dev_set_drvdata(&card->dev, NULL);
2616 }
2617
2618 static int _mmc_blk_suspend(struct mmc_card *card)
2619 {
2620         struct mmc_blk_data *part_md;
2621         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2622
2623         if (md) {
2624                 mmc_queue_suspend(&md->queue);
2625                 list_for_each_entry(part_md, &md->part, part) {
2626                         mmc_queue_suspend(&part_md->queue);
2627                 }
2628         }
2629         return 0;
2630 }
2631
2632 static void mmc_blk_shutdown(struct mmc_card *card)
2633 {
2634         _mmc_blk_suspend(card);
2635 }
2636
2637 #ifdef CONFIG_PM_SLEEP
2638 static int mmc_blk_suspend(struct device *dev)
2639 {
2640         struct mmc_card *card = mmc_dev_to_card(dev);
2641
2642         return _mmc_blk_suspend(card);
2643 }
2644
2645 static int mmc_blk_resume(struct device *dev)
2646 {
2647         struct mmc_blk_data *part_md;
2648         struct mmc_blk_data *md = dev_get_drvdata(dev);
2649
2650         if (md) {
2651                 /*
2652                  * Resume involves the card going into idle state,
2653                  * so current partition is always the main one.
2654                  */
2655                 md->part_curr = md->part_type;
2656                 mmc_queue_resume(&md->queue);
2657                 list_for_each_entry(part_md, &md->part, part) {
2658                         mmc_queue_resume(&part_md->queue);
2659                 }
2660         }
2661         return 0;
2662 }
2663 #endif
2664
2665 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2666
2667 static struct mmc_driver mmc_driver = {
2668         .drv            = {
2669                 .name   = "mmcblk",
2670                 .pm     = &mmc_blk_pm_ops,
2671         },
2672         .probe          = mmc_blk_probe,
2673         .remove         = mmc_blk_remove,
2674         .shutdown       = mmc_blk_shutdown,
2675 };
2676
2677 static int __init mmc_blk_init(void)
2678 {
2679         int res;
2680
2681         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2682                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2683
2684         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2685
2686         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2687         if (res)
2688                 goto out;
2689
2690         res = mmc_register_driver(&mmc_driver);
2691         if (res)
2692                 goto out2;
2693
2694         return 0;
2695  out2:
2696         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2697  out:
2698         return res;
2699 }
2700
2701 static void __exit mmc_blk_exit(void)
2702 {
2703         mmc_unregister_driver(&mmc_driver);
2704         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2705 }
2706
2707 module_init(mmc_blk_init);
2708 module_exit(mmc_blk_exit);
2709
2710 MODULE_LICENSE("GPL");
2711 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2712