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 #define CREATE_TRACE_POINTS
  40 #include <trace/events/mmc.h>
  41
  42 #include <linux/mmc/ioctl.h>
  43 #include <linux/mmc/card.h>
  44 #include <linux/mmc/host.h>
  45 #include <linux/mmc/mmc.h>
  46 #include <linux/mmc/sd.h>
  47
  48 #include <asm/uaccess.h>
  49
  50 #include "queue.h"
  51
  52 MODULE_ALIAS("mmc:block");
  53 #ifdef MODULE_PARAM_PREFIX
  54 #undef MODULE_PARAM_PREFIX
  55 #endif
  56 #define MODULE_PARAM_PREFIX "mmcblk."
  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 = kzalloc(sizeof(*idata), GFP_KERNEL);
 344         if (!idata) {
 345                 err = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 350                 err = -EFAULT;
 351                 goto idata_err;
 352         }
 353
 354         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 355         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 356                 err = -EOVERFLOW;
 357                 goto idata_err;
 358         }
 359
 360         if (!idata->buf_bytes)
 361                 return idata;
 362
 363         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 364         if (!idata->buf) {
 365                 err = -ENOMEM;
 366                 goto idata_err;
 367         }
 368
 369         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 370                                         idata->ic.data_ptr, idata->buf_bytes)) {
 371                 err = -EFAULT;
 372                 goto copy_err;
 373         }
 374
 375         return idata;
 376
 377 copy_err:
 378         kfree(idata->buf);
 379 idata_err:
 380         kfree(idata);
 381 out:
 382         return ERR_PTR(err);
 383 }
 384
 385 static int 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         trace_mmc_blk_erase_start(EXT_CSD_SANITIZE_START, 0, 0);
 450         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 451                                         EXT_CSD_SANITIZE_START, 1,
 452                                         MMC_SANITIZE_REQ_TIMEOUT);
 453         trace_mmc_blk_erase_end(EXT_CSD_SANITIZE_START, 0, 0);
 454
 455         if (err)
 456                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 457                        mmc_hostname(card->host), __func__, err);
 458
 459         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 460                                              __func__);
 461 out:
 462         return err;
 463 }
 464
 465 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 466                                struct mmc_blk_ioc_data *idata)
 467 {
 468         struct mmc_command cmd = {0};
 469         struct mmc_data data = {0};
 470         struct mmc_request mrq = {NULL};
 471         struct scatterlist sg;
 472         int err;
 473         int is_rpmb = false;
 474         u32 status = 0;
 475
 476         if (!card || !md || !idata)
 477                 return -EINVAL;
 478
 479         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 480                 is_rpmb = true;
 481
 482         cmd.opcode = idata->ic.opcode;
 483         cmd.arg = idata->ic.arg;
 484         cmd.flags = idata->ic.flags;
 485
 486         if (idata->buf_bytes) {
 487                 data.sg = &sg;
 488                 data.sg_len = 1;
 489                 data.blksz = idata->ic.blksz;
 490                 data.blocks = idata->ic.blocks;
 491
 492                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 493
 494                 if (idata->ic.write_flag)
 495                         data.flags = MMC_DATA_WRITE;
 496                 else
 497                         data.flags = MMC_DATA_READ;
 498
 499                 /* data.flags must already be set before doing this. */
 500                 mmc_set_data_timeout(&data, card);
 501
 502                 /* Allow overriding the timeout_ns for empirical tuning. */
 503                 if (idata->ic.data_timeout_ns)
 504                         data.timeout_ns = idata->ic.data_timeout_ns;
 505
 506                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 507                         /*
 508                          * Pretend this is a data transfer and rely on the
 509                          * host driver to compute timeout.  When all host
 510                          * drivers support cmd.cmd_timeout for R1B, this
 511                          * can be changed to:
 512                          *
 513                          *     mrq.data = NULL;
 514                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 515                          */
 516                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 517                 }
 518
 519                 mrq.data = &data;
 520         }
 521
 522         mrq.cmd = &cmd;
 523
 524         err = mmc_blk_part_switch(card, md);
 525         if (err)
 526                 return err;
 527
 528         if (idata->ic.is_acmd) {
 529                 err = mmc_app_cmd(card->host, card);
 530                 if (err)
 531                         return err;
 532         }
 533
 534         if (is_rpmb) {
 535                 err = mmc_set_blockcount(card, data.blocks,
 536                         idata->ic.write_flag & (1 << 31));
 537                 if (err)
 538                         return err;
 539         }
 540
 541         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 542             (cmd.opcode == MMC_SWITCH)) {
 543                 err = ioctl_do_sanitize(card);
 544
 545                 if (err)
 546                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 547                                __func__, err);
 548
 549                 return err;
 550         }
 551
 552         mmc_wait_for_req(card->host, &mrq);
 553
 554         if (cmd.error) {
 555                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 556                                                 __func__, cmd.error);
 557                 return cmd.error;
 558         }
 559         if (data.error) {
 560                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 561                                                 __func__, data.error);
 562                 return data.error;
 563         }
 564
 565         /*
 566          * According to the SD specs, some commands require a delay after
 567          * issuing the command.
 568          */
 569         if (idata->ic.postsleep_min_us)
 570                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 571
 572         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 573
 574         if (is_rpmb) {
 575                 /*
 576                  * Ensure RPMB command has completed by polling CMD13
 577                  * "Send Status".
 578                  */
 579                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 580                 if (err)
 581                         dev_err(mmc_dev(card->host),
 582                                         "%s: Card Status=0x%08X, error %d\n",
 583                                         __func__, status, err);
 584         }
 585
 586         return err;
 587 }
 588
 589 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 590                              struct mmc_ioc_cmd __user *ic_ptr)
 591 {
 592         struct mmc_blk_ioc_data *idata;
 593         struct mmc_blk_data *md;
 594         struct mmc_card *card;
 595         int err = 0, ioc_err = 0;
 596
 597         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 598         if (IS_ERR(idata))
 599                 return PTR_ERR(idata);
 600
 601         md = mmc_blk_get(bdev->bd_disk);
 602         if (!md) {
 603                 err = -EINVAL;
 604                 goto cmd_err;
 605         }
 606
 607         card = md->queue.card;
 608         if (IS_ERR(card)) {
 609                 err = PTR_ERR(card);
 610                 goto cmd_done;
 611         }
 612
 613         mmc_get_card(card);
 614
 615         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 616
 617         mmc_put_card(card);
 618
 619         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 620
 621 cmd_done:
 622         mmc_blk_put(md);
 623 cmd_err:
 624         kfree(idata->buf);
 625         kfree(idata);
 626         return ioc_err ? ioc_err : err;
 627 }
 628
 629 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 630                                    struct mmc_ioc_multi_cmd __user *user)
 631 {
 632         struct mmc_blk_ioc_data **idata = NULL;
 633         struct mmc_ioc_cmd __user *cmds = user->cmds;
 634         struct mmc_card *card;
 635         struct mmc_blk_data *md;
 636         int i, err = 0, ioc_err = 0;
 637         __u64 num_of_cmds;
 638
 639         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 640                            sizeof(num_of_cmds)))
 641                 return -EFAULT;
 642
 643         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 644                 return -EINVAL;
 645
 646         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 647         if (!idata)
 648                 return -ENOMEM;
 649
 650         for (i = 0; i < num_of_cmds; i++) {
 651                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 652                 if (IS_ERR(idata[i])) {
 653                         err = PTR_ERR(idata[i]);
 654                         num_of_cmds = i;
 655                         goto cmd_err;
 656                 }
 657         }
 658
 659         md = mmc_blk_get(bdev->bd_disk);
 660         if (!md)
 661                 goto cmd_err;
 662
 663         card = md->queue.card;
 664         if (IS_ERR(card)) {
 665                 err = PTR_ERR(card);
 666                 goto cmd_done;
 667         }
 668
 669         mmc_get_card(card);
 670
 671         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 672                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 673
 674         mmc_put_card(card);
 675
 676         /* copy to user if data and response */
 677         for (i = 0; i < num_of_cmds && !err; i++)
 678                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 679
 680 cmd_done:
 681         mmc_blk_put(md);
 682 cmd_err:
 683         for (i = 0; i < num_of_cmds; i++) {
 684                 kfree(idata[i]->buf);
 685                 kfree(idata[i]);
 686         }
 687         kfree(idata);
 688         return ioc_err ? ioc_err : err;
 689 }
 690
 691 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 692         unsigned int cmd, unsigned long arg)
 693 {
 694         /*
 695          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 696          * whole block device, not on a partition.  This prevents overspray
 697          * between sibling partitions.
 698          */
 699         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 700                 return -EPERM;
 701
 702         switch (cmd) {
 703         case MMC_IOC_CMD:
 704                 return mmc_blk_ioctl_cmd(bdev,
 705                                 (struct mmc_ioc_cmd __user *)arg);
 706         case MMC_IOC_MULTI_CMD:
 707                 return mmc_blk_ioctl_multi_cmd(bdev,
 708                                 (struct mmc_ioc_multi_cmd __user *)arg);
 709         default:
 710                 return -EINVAL;
 711         }
 712 }
 713
 714 #ifdef CONFIG_COMPAT
 715 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 716         unsigned int cmd, unsigned long arg)
 717 {
 718         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 719 }
 720 #endif
 721
 722 static const struct block_device_operations mmc_bdops = {
 723         .open                   = mmc_blk_open,
 724         .release                = mmc_blk_release,
 725         .getgeo                 = mmc_blk_getgeo,
 726         .owner                  = THIS_MODULE,
 727         .ioctl                  = mmc_blk_ioctl,
 728 #ifdef CONFIG_COMPAT
 729         .compat_ioctl           = mmc_blk_compat_ioctl,
 730 #endif
 731 };
 732
 733 static inline int mmc_blk_part_switch(struct mmc_card *card,
 734                                       struct mmc_blk_data *md)
 735 {
 736         int ret;
 737         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 738
 739         if (main_md->part_curr == md->part_type)
 740                 return 0;
 741
 742         if (mmc_card_mmc(card)) {
 743                 u8 part_config = card->ext_csd.part_config;
 744
 745                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 746                 part_config |= md->part_type;
 747
 748                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 749                                  EXT_CSD_PART_CONFIG, part_config,
 750                                  card->ext_csd.part_time);
 751                 if (ret)
 752                         return ret;
 753
 754                 card->ext_csd.part_config = part_config;
 755         }
 756
 757         main_md->part_curr = md->part_type;
 758         return 0;
 759 }
 760
 761 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 762 {
 763         int err;
 764         u32 result;
 765         __be32 *blocks;
 766
 767         struct mmc_request mrq = {NULL};
 768         struct mmc_command cmd = {0};
 769         struct mmc_data data = {0};
 770
 771         struct scatterlist sg;
 772
 773         cmd.opcode = MMC_APP_CMD;
 774         cmd.arg = card->rca << 16;
 775         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 776
 777         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 778         if (err)
 779                 return (u32)-1;
 780         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 781                 return (u32)-1;
 782
 783         memset(&cmd, 0, sizeof(struct mmc_command));
 784
 785         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 786         cmd.arg = 0;
 787         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 788
 789         data.blksz = 4;
 790         data.blocks = 1;
 791         data.flags = MMC_DATA_READ;
 792         data.sg = &sg;
 793         data.sg_len = 1;
 794         mmc_set_data_timeout(&data, card);
 795
 796         mrq.cmd = &cmd;
 797         mrq.data = &data;
 798
 799         blocks = kmalloc(4, GFP_KERNEL);
 800         if (!blocks)
 801                 return (u32)-1;
 802
 803         sg_init_one(&sg, blocks, 4);
 804
 805         mmc_wait_for_req(card->host, &mrq);
 806
 807         result = ntohl(*blocks);
 808         kfree(blocks);
 809
 810         if (cmd.error || data.error)
 811                 result = (u32)-1;
 812
 813         return result;
 814 }
 815
 816 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 817 {
 818         struct mmc_command cmd = {0};
 819         int err;
 820
 821         cmd.opcode = MMC_SEND_STATUS;
 822         if (!mmc_host_is_spi(card->host))
 823                 cmd.arg = card->rca << 16;
 824         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 825         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 826         if (err == 0)
 827                 *status = cmd.resp[0];
 828         return err;
 829 }
 830
 831 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 832                 bool hw_busy_detect, struct request *req, int *gen_err)
 833 {
 834         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 835         int err = 0;
 836         u32 status;
 837
 838         do {
 839                 err = get_card_status(card, &status, 5);
 840                 if (err) {
 841                         pr_err("%s: error %d requesting status\n",
 842                                req->rq_disk->disk_name, err);
 843                         return err;
 844                 }
 845
 846                 if (status & R1_ERROR) {
 847                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 848                                 req->rq_disk->disk_name, __func__, status);
 849                         *gen_err = 1;
 850                 }
 851
 852                 /* We may rely on the host hw to handle busy detection.*/
 853                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 854                         hw_busy_detect)
 855                         break;
 856
 857                 /*
 858                  * Timeout if the device never becomes ready for data and never
 859                  * leaves the program state.
 860                  */
 861                 if (time_after(jiffies, timeout)) {
 862                         pr_err("%s: Card stuck in programming state! %s %s\n",
 863                                 mmc_hostname(card->host),
 864                                 req->rq_disk->disk_name, __func__);
 865                         return -ETIMEDOUT;
 866                 }
 867
 868                 /*
 869                  * Some cards mishandle the status bits,
 870                  * so make sure to check both the busy
 871                  * indication and the card state.
 872                  */
 873         } while (!(status & R1_READY_FOR_DATA) ||
 874                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 875
 876         return err;
 877 }
 878
 879 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 880                 struct request *req, int *gen_err, u32 *stop_status)
 881 {
 882         struct mmc_host *host = card->host;
 883         struct mmc_command cmd = {0};
 884         int err;
 885         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 886
 887         /*
 888          * Normally we use R1B responses for WRITE, but in cases where the host
 889          * has specified a max_busy_timeout we need to validate it. A failure
 890          * means we need to prevent the host from doing hw busy detection, which
 891          * is done by converting to a R1 response instead.
 892          */
 893         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 894                 use_r1b_resp = false;
 895
 896         cmd.opcode = MMC_STOP_TRANSMISSION;
 897         if (use_r1b_resp) {
 898                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 899                 cmd.busy_timeout = timeout_ms;
 900         } else {
 901                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 902         }
 903
 904         err = mmc_wait_for_cmd(host, &cmd, 5);
 905         if (err)
 906                 return err;
 907
 908         *stop_status = cmd.resp[0];
 909
 910         /* No need to check card status in case of READ. */
 911         if (rq_data_dir(req) == READ)
 912                 return 0;
 913
 914         if (!mmc_host_is_spi(host) &&
 915                 (*stop_status & R1_ERROR)) {
 916                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 917                         req->rq_disk->disk_name, __func__, *stop_status);
 918                 *gen_err = 1;
 919         }
 920
 921         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 922 }
 923
 924 #define ERR_NOMEDIUM    3
 925 #define ERR_RETRY       2
 926 #define ERR_ABORT       1
 927 #define ERR_CONTINUE    0
 928
 929 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 930         bool status_valid, u32 status)
 931 {
 932         switch (error) {
 933         case -EILSEQ:
 934                 /* response crc error, retry the r/w cmd */
 935                 pr_err("%s: %s sending %s command, card status %#x\n",
 936                         req->rq_disk->disk_name, "response CRC error",
 937                         name, status);
 938                 return ERR_RETRY;
 939
 940         case -ETIMEDOUT:
 941                 pr_err("%s: %s sending %s command, card status %#x\n",
 942                         req->rq_disk->disk_name, "timed out", name, status);
 943
 944                 /* If the status cmd initially failed, retry the r/w cmd */
 945                 if (!status_valid) {
 946                         pr_err("%s: status not valid, retrying timeout\n", req->rq_disk->disk_name);
 947                         return ERR_RETRY;
 948                 }
 949                 /*
 950                  * If it was a r/w cmd crc error, or illegal command
 951                  * (eg, issued in wrong state) then retry - we should
 952                  * have corrected the state problem above.
 953                  */
 954                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 955                         pr_err("%s: command error, retrying timeout\n", req->rq_disk->disk_name);
 956                         return ERR_RETRY;
 957                 }
 958
 959                 /* Otherwise abort the command */
 960                 pr_err("%s: not retrying timeout\n", req->rq_disk->disk_name);
 961                 return ERR_ABORT;
 962
 963         default:
 964                 /* We don't understand the error code the driver gave us */
 965                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 966                        req->rq_disk->disk_name, error, status);
 967                 return ERR_ABORT;
 968         }
 969 }
 970
 971 /*
 972  * Initial r/w and stop cmd error recovery.
 973  * We don't know whether the card received the r/w cmd or not, so try to
 974  * restore things back to a sane state.  Essentially, we do this as follows:
 975  * - Obtain card status.  If the first attempt to obtain card status fails,
 976  *   the status word will reflect the failed status cmd, not the failed
 977  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 978  *   longer communicate with the card.
 979  * - Check the card state.  If the card received the cmd but there was a
 980  *   transient problem with the response, it might still be in a data transfer
 981  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 982  * - If the r/w cmd failed due to a response CRC error, it was probably
 983  *   transient, so retry the cmd.
 984  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 985  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 986  *   illegal cmd, retry.
 987  * Otherwise we don't understand what happened, so abort.
 988  */
 989 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 990         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 991 {
 992         bool prev_cmd_status_valid = true;
 993         u32 status, stop_status = 0;
 994         int err, retry;
 995
 996         if (mmc_card_removed(card))
 997                 return ERR_NOMEDIUM;
 998
 999         /*
1000          * Try to get card status which indicates both the card state
1001          * and why there was no response.  If the first attempt fails,
1002          * we can't be sure the returned status is for the r/w command.
1003          */
1004         for (retry = 2; retry >= 0; retry--) {
1005                 err = get_card_status(card, &status, 0);
1006                 if (!err)
1007                         break;
1008
1009                 /* Re-tune if needed */
1010                 mmc_retune_recheck(card->host);
1011
1012                 prev_cmd_status_valid = false;
1013                 pr_err("%s: error %d sending status command, %sing\n",
1014                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1015         }
1016
1017         /* We couldn't get a response from the card.  Give up. */
1018         if (err) {
1019                 /* Check if the card is removed */
1020                 if (mmc_detect_card_removed(card->host))
1021                         return ERR_NOMEDIUM;
1022                 return ERR_ABORT;
1023         }
1024
1025         /* Flag ECC errors */
1026         if ((status & R1_CARD_ECC_FAILED) ||
1027             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1028             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1029                 *ecc_err = 1;
1030
1031         /* Flag General errors */
1032         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1033                 if ((status & R1_ERROR) ||
1034                         (brq->stop.resp[0] & R1_ERROR)) {
1035                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1036                                req->rq_disk->disk_name, __func__,
1037                                brq->stop.resp[0], status);
1038                         *gen_err = 1;
1039                 }
1040
1041         /*
1042          * Check the current card state.  If it is in some data transfer
1043          * mode, tell it to stop (and hopefully transition back to TRAN.)
1044          */
1045         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1046             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1047                 err = send_stop(card,
1048                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1049                         req, gen_err, &stop_status);
1050                 if (err) {
1051                         pr_err("%s: error %d sending stop command\n",
1052                                req->rq_disk->disk_name, err);
1053                         /*
1054                          * If the stop cmd also timed out, the card is probably
1055                          * not present, so abort. Other errors are bad news too.
1056                          */
1057                         return ERR_ABORT;
1058                 }
1059
1060                 if (stop_status & R1_CARD_ECC_FAILED)
1061                         *ecc_err = 1;
1062         }
1063
1064         /* Check for set block count errors */
1065         if (brq->sbc.error)
1066                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1067                                 prev_cmd_status_valid, status);
1068
1069         /* Check for r/w command errors */
1070         if (brq->cmd.error)
1071                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1072                                 prev_cmd_status_valid, status);
1073
1074         /* Data errors */
1075         if (!brq->stop.error)
1076                 return ERR_CONTINUE;
1077
1078         /* Now for stop errors.  These aren't fatal to the transfer. */
1079         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1080                req->rq_disk->disk_name, brq->stop.error,
1081                brq->cmd.resp[0], status);
1082
1083         /*
1084          * Subsitute in our own stop status as this will give the error
1085          * state which happened during the execution of the r/w command.
1086          */
1087         if (stop_status) {
1088                 brq->stop.resp[0] = stop_status;
1089                 brq->stop.error = 0;
1090         }
1091         return ERR_CONTINUE;
1092 }
1093
1094 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1095                          int type)
1096 {
1097         int err;
1098
1099         if (md->reset_done & type)
1100                 return -EEXIST;
1101
1102         md->reset_done |= type;
1103         err = mmc_hw_reset(host);
1104         /* Ensure we switch back to the correct partition */
1105         if (err != -EOPNOTSUPP) {
1106                 struct mmc_blk_data *main_md =
1107                         dev_get_drvdata(&host->card->dev);
1108                 int part_err;
1109
1110                 main_md->part_curr = main_md->part_type;
1111                 part_err = mmc_blk_part_switch(host->card, md);
1112                 if (part_err) {
1113                         /*
1114                          * We have failed to get back into the correct
1115                          * partition, so we need to abort the whole request.
1116                          */
1117                         return -ENODEV;
1118                 }
1119         }
1120         return err;
1121 }
1122
1123 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1124 {
1125         md->reset_done &= ~type;
1126 }
1127
1128 int mmc_access_rpmb(struct mmc_queue *mq)
1129 {
1130         struct mmc_blk_data *md = mq->data;
1131         /*
1132          * If this is a RPMB partition access, return ture
1133          */
1134         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1135                 return true;
1136
1137         return false;
1138 }
1139
1140 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1141 {
1142         struct mmc_blk_data *md = mq->data;
1143         struct mmc_card *card = md->queue.card;
1144         unsigned int from, nr, arg;
1145         int err = 0, type = MMC_BLK_DISCARD;
1146
1147         if (!mmc_can_erase(card)) {
1148                 err = -EOPNOTSUPP;
1149                 goto out;
1150         }
1151
1152         from = blk_rq_pos(req);
1153         nr = blk_rq_sectors(req);
1154
1155         if (mmc_can_discard(card))
1156                 arg = MMC_DISCARD_ARG;
1157         else if (mmc_can_trim(card))
1158                 arg = MMC_TRIM_ARG;
1159         else
1160                 arg = MMC_ERASE_ARG;
1161 retry:
1162         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1163                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1164                                  INAND_CMD38_ARG_EXT_CSD,
1165                                  arg == MMC_TRIM_ARG ?
1166                                  INAND_CMD38_ARG_TRIM :
1167                                  INAND_CMD38_ARG_ERASE,
1168                                  0);
1169                 if (err)
1170                         goto out;
1171         }
1172         err = mmc_erase(card, from, nr, arg);
1173 out:
1174         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1175                 goto retry;
1176         if (!err)
1177                 mmc_blk_reset_success(md, type);
1178         blk_end_request(req, err, blk_rq_bytes(req));
1179
1180         return err ? 0 : 1;
1181 }
1182
1183 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1184                                        struct request *req)
1185 {
1186         struct mmc_blk_data *md = mq->data;
1187         struct mmc_card *card = md->queue.card;
1188         unsigned int from, nr, arg;
1189         int err = 0, type = MMC_BLK_SECDISCARD;
1190
1191         if (!(mmc_can_secure_erase_trim(card))) {
1192                 err = -EOPNOTSUPP;
1193                 goto out;
1194         }
1195
1196         from = blk_rq_pos(req);
1197         nr = blk_rq_sectors(req);
1198
1199         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1200                 arg = MMC_SECURE_TRIM1_ARG;
1201         else
1202                 arg = MMC_SECURE_ERASE_ARG;
1203
1204 retry:
1205         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1206                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1207                                  INAND_CMD38_ARG_EXT_CSD,
1208                                  arg == MMC_SECURE_TRIM1_ARG ?
1209                                  INAND_CMD38_ARG_SECTRIM1 :
1210                                  INAND_CMD38_ARG_SECERASE,
1211                                  0);
1212                 if (err)
1213                         goto out_retry;
1214         }
1215
1216         err = mmc_erase(card, from, nr, arg);
1217         if (err == -EIO)
1218                 goto out_retry;
1219         if (err)
1220                 goto out;
1221
1222         if (arg == MMC_SECURE_TRIM1_ARG) {
1223                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1224                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1225                                          INAND_CMD38_ARG_EXT_CSD,
1226                                          INAND_CMD38_ARG_SECTRIM2,
1227                                          0);
1228                         if (err)
1229                                 goto out_retry;
1230                 }
1231
1232                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1233                 if (err == -EIO)
1234                         goto out_retry;
1235                 if (err)
1236                         goto out;
1237         }
1238
1239 out_retry:
1240         if (err && !mmc_blk_reset(md, card->host, type))
1241                 goto retry;
1242         if (!err)
1243                 mmc_blk_reset_success(md, type);
1244 out:
1245         blk_end_request(req, err, blk_rq_bytes(req));
1246
1247         return err ? 0 : 1;
1248 }
1249
1250 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1251 {
1252         struct mmc_blk_data *md = mq->data;
1253         struct mmc_card *card = md->queue.card;
1254         int ret = 0;
1255
1256         ret = mmc_flush_cache(card);
1257         if (ret)
1258                 ret = -EIO;
1259
1260         blk_end_request_all(req, ret);
1261
1262         return ret ? 0 : 1;
1263 }
1264
1265 /*
1266  * Reformat current write as a reliable write, supporting
1267  * both legacy and the enhanced reliable write MMC cards.
1268  * In each transfer we'll handle only as much as a single
1269  * reliable write can handle, thus finish the request in
1270  * partial completions.
1271  */
1272 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1273                                     struct mmc_card *card,
1274                                     struct request *req)
1275 {
1276         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1277                 /* Legacy mode imposes restrictions on transfers. */
1278                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1279                         brq->data.blocks = 1;
1280
1281                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1282                         brq->data.blocks = card->ext_csd.rel_sectors;
1283                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1284                         brq->data.blocks = 1;
1285         }
1286 }
1287
1288 #define CMD_ERRORS                                                      \
1289         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1290          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1291          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1292          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1293          R1_CC_ERROR |          /* Card controller error */             \
1294          R1_ERROR)              /* General/unknown error */
1295
1296 static int mmc_blk_err_check(struct mmc_card *card,
1297                              struct mmc_async_req *areq)
1298 {
1299         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1300                                                     mmc_active);
1301         struct mmc_blk_request *brq = &mq_mrq->brq;
1302         struct request *req = mq_mrq->req;
1303         int need_retune = card->host->need_retune;
1304         int ecc_err = 0, gen_err = 0;
1305
1306         /*
1307          * sbc.error indicates a problem with the set block count
1308          * command.  No data will have been transferred.
1309          *
1310          * cmd.error indicates a problem with the r/w command.  No
1311          * data will have been transferred.
1312          *
1313          * stop.error indicates a problem with the stop command.  Data
1314          * may have been transferred, or may still be transferring.
1315          */
1316         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1317             brq->data.error) {
1318                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1319                 case ERR_RETRY:
1320                         return MMC_BLK_RETRY;
1321                 case ERR_ABORT:
1322                         return MMC_BLK_ABORT;
1323                 case ERR_NOMEDIUM:
1324                         return MMC_BLK_NOMEDIUM;
1325                 case ERR_CONTINUE:
1326                         break;
1327                 }
1328         }
1329
1330         /*
1331          * Check for errors relating to the execution of the
1332          * initial command - such as address errors.  No data
1333          * has been transferred.
1334          */
1335         if (brq->cmd.resp[0] & CMD_ERRORS) {
1336                 pr_err("%s: r/w command failed, status = %#x\n",
1337                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1338                 return MMC_BLK_ABORT;
1339         }
1340
1341         /*
1342          * Everything else is either success, or a data error of some
1343          * kind.  If it was a write, we may have transitioned to
1344          * program mode, which we have to wait for it to complete.
1345          */
1346         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1347                 int err;
1348
1349                 /* Check stop command response */
1350                 if (brq->stop.resp[0] & R1_ERROR) {
1351                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1352                                req->rq_disk->disk_name, __func__,
1353                                brq->stop.resp[0]);
1354                         gen_err = 1;
1355                 }
1356
1357                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1358                                         &gen_err);
1359                 if (err)
1360                         return MMC_BLK_CMD_ERR;
1361         }
1362
1363         /* if general error occurs, retry the write operation. */
1364         if (gen_err) {
1365                 pr_warn("%s: retrying write for general error\n",
1366                                 req->rq_disk->disk_name);
1367                 return MMC_BLK_RETRY;
1368         }
1369
1370         if (brq->data.error) {
1371                 if (need_retune && !brq->retune_retry_done) {
1372                         pr_info("%s: retrying because a re-tune was needed\n",
1373                                 req->rq_disk->disk_name);
1374                         brq->retune_retry_done = 1;
1375                         return MMC_BLK_RETRY;
1376                 }
1377                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1378                        req->rq_disk->disk_name, brq->data.error,
1379                        (unsigned)blk_rq_pos(req),
1380                        (unsigned)blk_rq_sectors(req),
1381                        brq->cmd.resp[0], brq->stop.resp[0]);
1382
1383                 if (rq_data_dir(req) == READ) {
1384                         if (ecc_err)
1385                                 return MMC_BLK_ECC_ERR;
1386                         return MMC_BLK_DATA_ERR;
1387                 } else {
1388                         return MMC_BLK_CMD_ERR;
1389                 }
1390         }
1391
1392         if (!brq->data.bytes_xfered)
1393                 return MMC_BLK_RETRY;
1394
1395         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1396                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1397                         return MMC_BLK_PARTIAL;
1398                 else
1399                         return MMC_BLK_SUCCESS;
1400         }
1401
1402         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1403                 return MMC_BLK_PARTIAL;
1404
1405         return MMC_BLK_SUCCESS;
1406 }
1407
1408 static int mmc_blk_packed_err_check(struct mmc_card *card,
1409                                     struct mmc_async_req *areq)
1410 {
1411         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1412                         mmc_active);
1413         struct request *req = mq_rq->req;
1414         struct mmc_packed *packed = mq_rq->packed;
1415         int err, check, status;
1416         u8 *ext_csd;
1417
1418         BUG_ON(!packed);
1419
1420         packed->retries--;
1421         check = mmc_blk_err_check(card, areq);
1422         err = get_card_status(card, &status, 0);
1423         if (err) {
1424                 pr_err("%s: error %d sending status command\n",
1425                        req->rq_disk->disk_name, err);
1426                 return MMC_BLK_ABORT;
1427         }
1428
1429         if (status & R1_EXCEPTION_EVENT) {
1430                 err = mmc_get_ext_csd(card, &ext_csd);
1431                 if (err) {
1432                         pr_err("%s: error %d sending ext_csd\n",
1433                                req->rq_disk->disk_name, err);
1434                         return MMC_BLK_ABORT;
1435                 }
1436
1437                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1438                      EXT_CSD_PACKED_FAILURE) &&
1439                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1440                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1441                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1442                             EXT_CSD_PACKED_INDEXED_ERROR) {
1443                                 packed->idx_failure =
1444                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1445                                 check = MMC_BLK_PARTIAL;
1446                         }
1447                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1448                                "failure index: %d\n",
1449                                req->rq_disk->disk_name, packed->nr_entries,
1450                                packed->blocks, packed->idx_failure);
1451                 }
1452                 kfree(ext_csd);
1453         }
1454
1455         return check;
1456 }
1457
1458 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1459                                struct mmc_card *card,
1460                                int disable_multi,
1461                                struct mmc_queue *mq)
1462 {
1463         u32 readcmd, writecmd;
1464         struct mmc_blk_request *brq = &mqrq->brq;
1465         struct request *req = mqrq->req;
1466         struct mmc_blk_data *md = mq->data;
1467         bool do_data_tag;
1468
1469         /*
1470          * Reliable writes are used to implement Forced Unit Access and
1471          * are supported only on MMCs.
1472          */
1473         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1474                 (rq_data_dir(req) == WRITE) &&
1475                 (md->flags & MMC_BLK_REL_WR);
1476
1477         memset(brq, 0, sizeof(struct mmc_blk_request));
1478         brq->mrq.cmd = &brq->cmd;
1479         brq->mrq.data = &brq->data;
1480
1481         brq->cmd.arg = blk_rq_pos(req);
1482         if (!mmc_card_blockaddr(card))
1483                 brq->cmd.arg <<= 9;
1484         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1485         brq->data.blksz = 512;
1486         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1487         brq->stop.arg = 0;
1488         brq->data.blocks = blk_rq_sectors(req);
1489
1490         /*
1491          * The block layer doesn't support all sector count
1492          * restrictions, so we need to be prepared for too big
1493          * requests.
1494          */
1495         if (brq->data.blocks > card->host->max_blk_count)
1496                 brq->data.blocks = card->host->max_blk_count;
1497
1498         if (brq->data.blocks > 1) {
1499                 /*
1500                  * After a read error, we redo the request one sector
1501                  * at a time in order to accurately determine which
1502                  * sectors can be read successfully.
1503                  */
1504                 if (disable_multi)
1505                         brq->data.blocks = 1;
1506
1507                 /*
1508                  * Some controllers have HW issues while operating
1509                  * in multiple I/O mode
1510                  */
1511                 if (card->host->ops->multi_io_quirk)
1512                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1513                                                 (rq_data_dir(req) == READ) ?
1514                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1515                                                 brq->data.blocks);
1516         }
1517
1518         if (brq->data.blocks > 1 || do_rel_wr) {
1519                 /* SPI multiblock writes terminate using a special
1520                  * token, not a STOP_TRANSMISSION request.
1521                  */
1522                 if (!mmc_host_is_spi(card->host) ||
1523                     rq_data_dir(req) == READ)
1524                         brq->mrq.stop = &brq->stop;
1525                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1526                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1527         } else {
1528                 brq->mrq.stop = NULL;
1529                 readcmd = MMC_READ_SINGLE_BLOCK;
1530                 writecmd = MMC_WRITE_BLOCK;
1531         }
1532         if (rq_data_dir(req) == READ) {
1533                 brq->cmd.opcode = readcmd;
1534                 brq->data.flags |= MMC_DATA_READ;
1535                 if (brq->mrq.stop)
1536                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1537                                         MMC_CMD_AC;
1538         } else {
1539                 brq->cmd.opcode = writecmd;
1540                 brq->data.flags |= MMC_DATA_WRITE;
1541                 if (brq->mrq.stop)
1542                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1543                                         MMC_CMD_AC;
1544         }
1545
1546         if (do_rel_wr)
1547                 mmc_apply_rel_rw(brq, card, req);
1548
1549         /*
1550          * Data tag is used only during writing meta data to speed
1551          * up write and any subsequent read of this meta data
1552          */
1553         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1554                 (req->cmd_flags & REQ_META) &&
1555                 (rq_data_dir(req) == WRITE) &&
1556                 ((brq->data.blocks * brq->data.blksz) >=
1557                  card->ext_csd.data_tag_unit_size);
1558
1559         /*
1560          * Pre-defined multi-block transfers are preferable to
1561          * open ended-ones (and necessary for reliable writes).
1562          * However, it is not sufficient to just send CMD23,
1563          * and avoid the final CMD12, as on an error condition
1564          * CMD12 (stop) needs to be sent anyway. This, coupled
1565          * with Auto-CMD23 enhancements provided by some
1566          * hosts, means that the complexity of dealing
1567          * with this is best left to the host. If CMD23 is
1568          * supported by card and host, we'll fill sbc in and let
1569          * the host deal with handling it correctly. This means
1570          * that for hosts that don't expose MMC_CAP_CMD23, no
1571          * change of behavior will be observed.
1572          *
1573          * N.B: Some MMC cards experience perf degradation.
1574          * We'll avoid using CMD23-bounded multiblock writes for
1575          * these, while retaining features like reliable writes.
1576          */
1577         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1578             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1579              do_data_tag)) {
1580                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1581                 brq->sbc.arg = brq->data.blocks |
1582                         (do_rel_wr ? (1 << 31) : 0) |
1583                         (do_data_tag ? (1 << 29) : 0);
1584                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1585                 brq->mrq.sbc = &brq->sbc;
1586         }
1587
1588         mmc_set_data_timeout(&brq->data, card);
1589
1590         brq->data.sg = mqrq->sg;
1591         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1592
1593         /*
1594          * Adjust the sg list so it is the same size as the
1595          * request.
1596          */
1597         if (brq->data.blocks != blk_rq_sectors(req)) {
1598                 int i, data_size = brq->data.blocks << 9;
1599                 struct scatterlist *sg;
1600
1601                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1602                         data_size -= sg->length;
1603                         if (data_size <= 0) {
1604                                 sg->length += data_size;
1605                                 i++;
1606                                 break;
1607                         }
1608                 }
1609                 brq->data.sg_len = i;
1610         }
1611
1612         mqrq->mmc_active.mrq = &brq->mrq;
1613         mqrq->mmc_active.err_check = mmc_blk_err_check;
1614
1615         mmc_queue_bounce_pre(mqrq);
1616 }
1617
1618 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1619                                           struct mmc_card *card)
1620 {
1621         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1622         unsigned int max_seg_sz = queue_max_segment_size(q);
1623         unsigned int len, nr_segs = 0;
1624
1625         do {
1626                 len = min(hdr_sz, max_seg_sz);
1627                 hdr_sz -= len;
1628                 nr_segs++;
1629         } while (hdr_sz);
1630
1631         return nr_segs;
1632 }
1633
1634 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1635 {
1636         struct request_queue *q = mq->queue;
1637         struct mmc_card *card = mq->card;
1638         struct request *cur = req, *next = NULL;
1639         struct mmc_blk_data *md = mq->data;
1640         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1641         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1642         unsigned int req_sectors = 0, phys_segments = 0;
1643         unsigned int max_blk_count, max_phys_segs;
1644         bool put_back = true;
1645         u8 max_packed_rw = 0;
1646         u8 reqs = 0;
1647
1648         if (!(md->flags & MMC_BLK_PACKED_CMD))
1649                 goto no_packed;
1650
1651         if ((rq_data_dir(cur) == WRITE) &&
1652             mmc_host_packed_wr(card->host))
1653                 max_packed_rw = card->ext_csd.max_packed_writes;
1654
1655         if (max_packed_rw == 0)
1656                 goto no_packed;
1657
1658         if (mmc_req_rel_wr(cur) &&
1659             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1660                 goto no_packed;
1661
1662         if (mmc_large_sector(card) &&
1663             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1664                 goto no_packed;
1665
1666         mmc_blk_clear_packed(mqrq);
1667
1668         max_blk_count = min(card->host->max_blk_count,
1669                             card->host->max_req_size >> 9);
1670         if (unlikely(max_blk_count > 0xffff))
1671                 max_blk_count = 0xffff;
1672
1673         max_phys_segs = queue_max_segments(q);
1674         req_sectors += blk_rq_sectors(cur);
1675         phys_segments += cur->nr_phys_segments;
1676
1677         if (rq_data_dir(cur) == WRITE) {
1678                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1679                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1680         }
1681
1682         do {
1683                 if (reqs >= max_packed_rw - 1) {
1684                         put_back = false;
1685                         break;
1686                 }
1687
1688                 spin_lock_irq(q->queue_lock);
1689                 next = blk_fetch_request(q);
1690                 spin_unlock_irq(q->queue_lock);
1691                 if (!next) {
1692                         put_back = false;
1693                         break;
1694                 }
1695
1696                 if (mmc_large_sector(card) &&
1697                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1698                         break;
1699
1700                 if (next->cmd_flags & REQ_DISCARD ||
1701                     next->cmd_flags & REQ_FLUSH)
1702                         break;
1703
1704                 if (rq_data_dir(cur) != rq_data_dir(next))
1705                         break;
1706
1707                 if (mmc_req_rel_wr(next) &&
1708                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1709                         break;
1710
1711                 req_sectors += blk_rq_sectors(next);
1712                 if (req_sectors > max_blk_count)
1713                         break;
1714
1715                 phys_segments +=  next->nr_phys_segments;
1716                 if (phys_segments > max_phys_segs)
1717                         break;
1718
1719                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1720                 cur = next;
1721                 reqs++;
1722         } while (1);
1723
1724         if (put_back) {
1725                 spin_lock_irq(q->queue_lock);
1726                 blk_requeue_request(q, next);
1727                 spin_unlock_irq(q->queue_lock);
1728         }
1729
1730         if (reqs > 0) {
1731                 list_add(&req->queuelist, &mqrq->packed->list);
1732                 mqrq->packed->nr_entries = ++reqs;
1733                 mqrq->packed->retries = reqs;
1734                 return reqs;
1735         }
1736
1737 no_packed:
1738         mqrq->cmd_type = MMC_PACKED_NONE;
1739         return 0;
1740 }
1741
1742 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1743                                         struct mmc_card *card,
1744                                         struct mmc_queue *mq)
1745 {
1746         struct mmc_blk_request *brq = &mqrq->brq;
1747         struct request *req = mqrq->req;
1748         struct request *prq;
1749         struct mmc_blk_data *md = mq->data;
1750         struct mmc_packed *packed = mqrq->packed;
1751         bool do_rel_wr, do_data_tag;
1752         u32 *packed_cmd_hdr;
1753         u8 hdr_blocks;
1754         u8 i = 1;
1755
1756         BUG_ON(!packed);
1757
1758         mqrq->cmd_type = MMC_PACKED_WRITE;
1759         packed->blocks = 0;
1760         packed->idx_failure = MMC_PACKED_NR_IDX;
1761
1762         packed_cmd_hdr = packed->cmd_hdr;
1763         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1764         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1765                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1766         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1767
1768         /*
1769          * Argument for each entry of packed group
1770          */
1771         list_for_each_entry(prq, &packed->list, queuelist) {
1772                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1773                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1774                         (prq->cmd_flags & REQ_META) &&
1775                         (rq_data_dir(prq) == WRITE) &&
1776                         ((brq->data.blocks * brq->data.blksz) >=
1777                          card->ext_csd.data_tag_unit_size);
1778                 /* Argument of CMD23 */
1779                 packed_cmd_hdr[(i * 2)] =
1780                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1781                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1782                         blk_rq_sectors(prq);
1783                 /* Argument of CMD18 or CMD25 */
1784                 packed_cmd_hdr[((i * 2)) + 1] =
1785                         mmc_card_blockaddr(card) ?
1786                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1787                 packed->blocks += blk_rq_sectors(prq);
1788                 i++;
1789         }
1790
1791         memset(brq, 0, sizeof(struct mmc_blk_request));
1792         brq->mrq.cmd = &brq->cmd;
1793         brq->mrq.data = &brq->data;
1794         brq->mrq.sbc = &brq->sbc;
1795         brq->mrq.stop = &brq->stop;
1796
1797         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1798         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1799         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1800
1801         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1802         brq->cmd.arg = blk_rq_pos(req);
1803         if (!mmc_card_blockaddr(card))
1804                 brq->cmd.arg <<= 9;
1805         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1806
1807         brq->data.blksz = 512;
1808         brq->data.blocks = packed->blocks + hdr_blocks;
1809         brq->data.flags |= MMC_DATA_WRITE;
1810
1811         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1812         brq->stop.arg = 0;
1813         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1814
1815         mmc_set_data_timeout(&brq->data, card);
1816
1817         brq->data.sg = mqrq->sg;
1818         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1819
1820         mqrq->mmc_active.mrq = &brq->mrq;
1821         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1822
1823         mmc_queue_bounce_pre(mqrq);
1824 }
1825
1826 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1827                            struct mmc_blk_request *brq, struct request *req,
1828                            int ret)
1829 {
1830         struct mmc_queue_req *mq_rq;
1831         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1832
1833         /*
1834          * If this is an SD card and we're writing, we can first
1835          * mark the known good sectors as ok.
1836          *
1837          * If the card is not SD, we can still ok written sectors
1838          * as reported by the controller (which might be less than
1839          * the real number of written sectors, but never more).
1840          */
1841         if (mmc_card_sd(card)) {
1842                 u32 blocks;
1843
1844                 blocks = mmc_sd_num_wr_blocks(card);
1845                 if (blocks != (u32)-1) {
1846                         ret = blk_end_request(req, 0, blocks << 9);
1847                 }
1848         } else {
1849                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1850                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1851         }
1852         return ret;
1853 }
1854
1855 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1856 {
1857         struct request *prq;
1858         struct mmc_packed *packed = mq_rq->packed;
1859         int idx = packed->idx_failure, i = 0;
1860         int ret = 0;
1861
1862         BUG_ON(!packed);
1863
1864         while (!list_empty(&packed->list)) {
1865                 prq = list_entry_rq(packed->list.next);
1866                 if (idx == i) {
1867                         /* retry from error index */
1868                         packed->nr_entries -= idx;
1869                         mq_rq->req = prq;
1870                         ret = 1;
1871
1872                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1873                                 list_del_init(&prq->queuelist);
1874                                 mmc_blk_clear_packed(mq_rq);
1875                         }
1876                         return ret;
1877                 }
1878                 list_del_init(&prq->queuelist);
1879                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1880                 i++;
1881         }
1882
1883         mmc_blk_clear_packed(mq_rq);
1884         return ret;
1885 }
1886
1887 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1888 {
1889         struct request *prq;
1890         struct mmc_packed *packed = mq_rq->packed;
1891
1892         BUG_ON(!packed);
1893
1894         while (!list_empty(&packed->list)) {
1895                 prq = list_entry_rq(packed->list.next);
1896                 list_del_init(&prq->queuelist);
1897                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1898         }
1899
1900         mmc_blk_clear_packed(mq_rq);
1901 }
1902
1903 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1904                                       struct mmc_queue_req *mq_rq)
1905 {
1906         struct request *prq;
1907         struct request_queue *q = mq->queue;
1908         struct mmc_packed *packed = mq_rq->packed;
1909
1910         BUG_ON(!packed);
1911
1912         while (!list_empty(&packed->list)) {
1913                 prq = list_entry_rq(packed->list.prev);
1914                 if (prq->queuelist.prev != &packed->list) {
1915                         list_del_init(&prq->queuelist);
1916                         spin_lock_irq(q->queue_lock);
1917                         blk_requeue_request(mq->queue, prq);
1918                         spin_unlock_irq(q->queue_lock);
1919                 } else {
1920                         list_del_init(&prq->queuelist);
1921                 }
1922         }
1923
1924         mmc_blk_clear_packed(mq_rq);
1925 }
1926
1927 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1928 {
1929         struct mmc_blk_data *md = mq->data;
1930         struct mmc_card *card = md->queue.card;
1931         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1932         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1933         enum mmc_blk_status status;
1934         struct mmc_queue_req *mq_rq;
1935         struct request *req = rqc;
1936         struct mmc_async_req *areq;
1937         const u8 packed_nr = 2;
1938         u8 reqs = 0;
1939
1940         if (!rqc && !mq->mqrq_prev->req)
1941                 return 0;
1942
1943         if (rqc)
1944                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1945
1946         do {
1947                 if (rqc) {
1948                         /*
1949                          * When 4KB native sector is enabled, only 8 blocks
1950                          * multiple read or write is allowed
1951                          */
1952                         if ((brq->data.blocks & 0x07) &&
1953                             (card->ext_csd.data_sector_size == 4096)) {
1954                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1955                                         req->rq_disk->disk_name);
1956                                 mq_rq = mq->mqrq_cur;
1957                                 goto cmd_abort;
1958                         }
1959
1960                         if (reqs >= packed_nr)
1961                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1962                                                             card, mq);
1963                         else
1964                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1965                         areq = &mq->mqrq_cur->mmc_active;
1966                 } else
1967                         areq = NULL;
1968                 areq = mmc_start_req(card->host, areq, (int *) &status);
1969                 if (!areq) {
1970                         if (status == MMC_BLK_NEW_REQUEST)
1971                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1972                         return 0;
1973                 }
1974
1975                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1976                 brq = &mq_rq->brq;
1977                 req = mq_rq->req;
1978                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1979                 mmc_queue_bounce_post(mq_rq);
1980
1981                 switch (status) {
1982                 case MMC_BLK_SUCCESS:
1983                 case MMC_BLK_PARTIAL:
1984                         /*
1985                          * A block was successfully transferred.
1986                          */
1987                         mmc_blk_reset_success(md, type);
1988
1989                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1990                                 ret = mmc_blk_end_packed_req(mq_rq);
1991                                 break;
1992                         } else {
1993                                 ret = blk_end_request(req, 0,
1994                                                 brq->data.bytes_xfered);
1995                         }
1996
1997                         /*
1998                          * If the blk_end_request function returns non-zero even
1999                          * though all data has been transferred and no errors
2000                          * were returned by the host controller, it's a bug.
2001                          */
2002                         if (status == MMC_BLK_SUCCESS && ret) {
2003                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2004                                        __func__, blk_rq_bytes(req),
2005                                        brq->data.bytes_xfered);
2006                                 rqc = NULL;
2007                                 goto cmd_abort;
2008                         }
2009                         break;
2010                 case MMC_BLK_CMD_ERR:
2011                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2012                         if (mmc_blk_reset(md, card->host, type))
2013                                 goto cmd_abort;
2014                         if (!ret)
2015                                 goto start_new_req;
2016                         break;
2017                 case MMC_BLK_RETRY:
2018                         retune_retry_done = brq->retune_retry_done;
2019                         if (retry++ < 5)
2020                                 break;
2021                         /* Fall through */
2022                 case MMC_BLK_ABORT:
2023                         if (!mmc_blk_reset(md, card->host, type))
2024                                 break;
2025                         goto cmd_abort;
2026                 case MMC_BLK_DATA_ERR: {
2027                         int err;
2028
2029                         err = mmc_blk_reset(md, card->host, type);
2030                         if (!err)
2031                                 break;
2032                         if (err == -ENODEV ||
2033                                 mmc_packed_cmd(mq_rq->cmd_type))
2034                                 goto cmd_abort;
2035                         /* Fall through */
2036                 }
2037                 case MMC_BLK_ECC_ERR:
2038                         if (brq->data.blocks > 1) {
2039                                 /* Redo read one sector at a time */
2040                                 pr_warn("%s: retrying using single block read\n",
2041                                         req->rq_disk->disk_name);
2042                                 disable_multi = 1;
2043                                 break;
2044                         }
2045                         /*
2046                          * After an error, we redo I/O one sector at a
2047                          * time, so we only reach here after trying to
2048                          * read a single sector.
2049                          */
2050                         ret = blk_end_request(req, -EIO,
2051                                                 brq->data.blksz);
2052                         if (!ret)
2053                                 goto start_new_req;
2054                         break;
2055                 case MMC_BLK_NOMEDIUM:
2056                         goto cmd_abort;
2057                 default:
2058                         pr_err("%s: Unhandled return value (%d)",
2059                                         req->rq_disk->disk_name, status);
2060                         goto cmd_abort;
2061                 }
2062
2063                 if (ret) {
2064                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2065                                 if (!mq_rq->packed->retries)
2066                                         goto cmd_abort;
2067                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2068                                 mmc_start_req(card->host,
2069                                               &mq_rq->mmc_active, NULL);
2070                         } else {
2071
2072                                 /*
2073                                  * In case of a incomplete request
2074                                  * prepare it again and resend.
2075                                  */
2076                                 mmc_blk_rw_rq_prep(mq_rq, card,
2077                                                 disable_multi, mq);
2078                                 mmc_start_req(card->host,
2079                                                 &mq_rq->mmc_active, NULL);
2080                         }
2081                         mq_rq->brq.retune_retry_done = retune_retry_done;
2082                 }
2083         } while (ret);
2084
2085         return 1;
2086
2087  cmd_abort:
2088         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2089                 mmc_blk_abort_packed_req(mq_rq);
2090         } else {
2091                 if (mmc_card_removed(card))
2092                         req->cmd_flags |= REQ_QUIET;
2093                 while (ret)
2094                         ret = blk_end_request(req, -EIO,
2095                                         blk_rq_cur_bytes(req));
2096         }
2097
2098  start_new_req:
2099         if (rqc) {
2100                 if (mmc_card_removed(card)) {
2101                         rqc->cmd_flags |= REQ_QUIET;
2102                         blk_end_request_all(rqc, -EIO);
2103                 } else {
2104                         /*
2105                          * If current request is packed, it needs to put back.
2106                          */
2107                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2108                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2109
2110                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2111                         mmc_start_req(card->host,
2112                                       &mq->mqrq_cur->mmc_active, NULL);
2113                 }
2114         }
2115
2116         return 0;
2117 }
2118
2119 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2120 {
2121         int ret;
2122         struct mmc_blk_data *md = mq->data;
2123         struct mmc_card *card = md->queue.card;
2124         struct mmc_host *host = card->host;
2125         unsigned long flags;
2126         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2127
2128         if (req && !mq->mqrq_prev->req)
2129                 /* claim host only for the first request */
2130                 mmc_get_card(card);
2131
2132         ret = mmc_blk_part_switch(card, md);
2133         if (ret) {
2134                 if (req) {
2135                         blk_end_request_all(req, -EIO);
2136                 }
2137                 ret = 0;
2138                 goto out;
2139         }
2140
2141         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2142         if (cmd_flags & REQ_DISCARD) {
2143                 /* complete ongoing async transfer before issuing discard */
2144                 if (card->host->areq)
2145                         mmc_blk_issue_rw_rq(mq, NULL);
2146                 if (req->cmd_flags & REQ_SECURE)
2147                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2148                 else
2149                         ret = mmc_blk_issue_discard_rq(mq, req);
2150         } else if (cmd_flags & REQ_FLUSH) {
2151                 /* complete ongoing async transfer before issuing flush */
2152                 if (card->host->areq)
2153                         mmc_blk_issue_rw_rq(mq, NULL);
2154                 ret = mmc_blk_issue_flush(mq, req);
2155         } else {
2156                 if (!req && host->areq) {
2157                         spin_lock_irqsave(&host->context_info.lock, flags);
2158                         host->context_info.is_waiting_last_req = true;
2159                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2160                 }
2161                 ret = mmc_blk_issue_rw_rq(mq, req);
2162         }
2163
2164 out:
2165         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2166              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2167                 /*
2168                  * Release host when there are no more requests
2169                  * and after special request(discard, flush) is done.
2170                  * In case sepecial request, there is no reentry to
2171                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2172                  */
2173                 mmc_put_card(card);
2174         return ret;
2175 }
2176
2177 static inline int mmc_blk_readonly(struct mmc_card *card)
2178 {
2179         return mmc_card_readonly(card) ||
2180                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2181 }
2182
2183 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2184                                               struct device *parent,
2185                                               sector_t size,
2186                                               bool default_ro,
2187                                               const char *subname,
2188                                               int area_type)
2189 {
2190         struct mmc_blk_data *md;
2191         int devidx, ret;
2192
2193         devidx = find_first_zero_bit(dev_use, max_devices);
2194         if (devidx >= max_devices)
2195                 return ERR_PTR(-ENOSPC);
2196         __set_bit(devidx, dev_use);
2197
2198         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2199         if (!md) {
2200                 ret = -ENOMEM;
2201                 goto out;
2202         }
2203
2204         /*
2205          * !subname implies we are creating main mmc_blk_data that will be
2206          * associated with mmc_card with dev_set_drvdata. Due to device
2207          * partitions, devidx will not coincide with a per-physical card
2208          * index anymore so we keep track of a name index.
2209          */
2210         if (!subname) {
2211                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2212                 __set_bit(md->name_idx, name_use);
2213         } else
2214                 md->name_idx = ((struct mmc_blk_data *)
2215                                 dev_to_disk(parent)->private_data)->name_idx;
2216
2217         md->area_type = area_type;
2218
2219         /*
2220          * Set the read-only status based on the supported commands
2221          * and the write protect switch.
2222          */
2223         md->read_only = mmc_blk_readonly(card);
2224
2225         md->disk = alloc_disk(perdev_minors);
2226         if (md->disk == NULL) {
2227                 ret = -ENOMEM;
2228                 goto err_kfree;
2229         }
2230
2231         spin_lock_init(&md->lock);
2232         INIT_LIST_HEAD(&md->part);
2233         md->usage = 1;
2234
2235         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2236         if (ret)
2237                 goto err_putdisk;
2238
2239         md->queue.issue_fn = mmc_blk_issue_rq;
2240         md->queue.data = md;
2241
2242         md->disk->major = MMC_BLOCK_MAJOR;
2243         md->disk->first_minor = devidx * perdev_minors;
2244         md->disk->fops = &mmc_bdops;
2245         md->disk->private_data = md;
2246         md->disk->queue = md->queue.queue;
2247         md->disk->driverfs_dev = parent;
2248         set_disk_ro(md->disk, md->read_only || default_ro);
2249         md->disk->flags = GENHD_FL_EXT_DEVT;
2250         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2251                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2252
2253         /*
2254          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2255          *
2256          * - be set for removable media with permanent block devices
2257          * - be unset for removable block devices with permanent media
2258          *
2259          * Since MMC block devices clearly fall under the second
2260          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2261          * should use the block device creation/destruction hotplug
2262          * messages to tell when the card is present.
2263          */
2264
2265         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2266                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2267
2268         if (mmc_card_mmc(card))
2269                 blk_queue_logical_block_size(md->queue.queue,
2270                                              card->ext_csd.data_sector_size);
2271         else
2272                 blk_queue_logical_block_size(md->queue.queue, 512);
2273
2274         set_capacity(md->disk, size);
2275
2276         if (mmc_host_cmd23(card->host)) {
2277                 if (mmc_card_mmc(card) ||
2278                     (mmc_card_sd(card) &&
2279                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2280                         md->flags |= MMC_BLK_CMD23;
2281         }
2282
2283         if (mmc_card_mmc(card) &&
2284             md->flags & MMC_BLK_CMD23 &&
2285             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2286              card->ext_csd.rel_sectors)) {
2287                 md->flags |= MMC_BLK_REL_WR;
2288                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2289         }
2290
2291         if (mmc_card_mmc(card) &&
2292             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2293             (md->flags & MMC_BLK_CMD23) &&
2294             card->ext_csd.packed_event_en) {
2295                 if (!mmc_packed_init(&md->queue, card))
2296                         md->flags |= MMC_BLK_PACKED_CMD;
2297         }
2298
2299         return md;
2300
2301  err_putdisk:
2302         put_disk(md->disk);
2303  err_kfree:
2304         kfree(md);
2305  out:
2306         return ERR_PTR(ret);
2307 }
2308
2309 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2310 {
2311         sector_t size;
2312
2313         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2314                 /*
2315                  * The EXT_CSD sector count is in number or 512 byte
2316                  * sectors.
2317                  */
2318                 size = card->ext_csd.sectors;
2319         } else {
2320                 /*
2321                  * The CSD capacity field is in units of read_blkbits.
2322                  * set_capacity takes units of 512 bytes.
2323                  */
2324                 size = (typeof(sector_t))card->csd.capacity
2325                         << (card->csd.read_blkbits - 9);
2326         }
2327
2328         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2329                                         MMC_BLK_DATA_AREA_MAIN);
2330 }
2331
2332 static int mmc_blk_alloc_part(struct mmc_card *card,
2333                               struct mmc_blk_data *md,
2334                               unsigned int part_type,
2335                               sector_t size,
2336                               bool default_ro,
2337                               const char *subname,
2338                               int area_type)
2339 {
2340         char cap_str[10];
2341         struct mmc_blk_data *part_md;
2342
2343         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2344                                     subname, area_type);
2345         if (IS_ERR(part_md))
2346                 return PTR_ERR(part_md);
2347         part_md->part_type = part_type;
2348         list_add(&part_md->part, &md->part);
2349
2350         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2351                         cap_str, sizeof(cap_str));
2352         pr_info("%s: %s %s partition %u %s\n",
2353                part_md->disk->disk_name, mmc_card_id(card),
2354                mmc_card_name(card), part_md->part_type, cap_str);
2355         return 0;
2356 }
2357
2358 /* MMC Physical partitions consist of two boot partitions and
2359  * up to four general purpose partitions.
2360  * For each partition enabled in EXT_CSD a block device will be allocatedi
2361  * to provide access to the partition.
2362  */
2363
2364 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2365 {
2366         int idx, ret = 0;
2367
2368         if (!mmc_card_mmc(card))
2369                 return 0;
2370
2371         for (idx = 0; idx < card->nr_parts; idx++) {
2372                 if (card->part[idx].size) {
2373                         ret = mmc_blk_alloc_part(card, md,
2374                                 card->part[idx].part_cfg,
2375                                 card->part[idx].size >> 9,
2376                                 card->part[idx].force_ro,
2377                                 card->part[idx].name,
2378                                 card->part[idx].area_type);
2379                         if (ret)
2380                                 return ret;
2381                 }
2382         }
2383
2384         return ret;
2385 }
2386
2387 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2388 {
2389         struct mmc_card *card;
2390
2391         if (md) {
2392                 /*
2393                  * Flush remaining requests and free queues. It
2394                  * is freeing the queue that stops new requests
2395                  * from being accepted.
2396                  */
2397                 card = md->queue.card;
2398                 mmc_cleanup_queue(&md->queue);
2399                 if (md->flags & MMC_BLK_PACKED_CMD)
2400                         mmc_packed_clean(&md->queue);
2401                 if (md->disk->flags & GENHD_FL_UP) {
2402                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2403                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2404                                         card->ext_csd.boot_ro_lockable)
2405                                 device_remove_file(disk_to_dev(md->disk),
2406                                         &md->power_ro_lock);
2407
2408                         del_gendisk(md->disk);
2409                 }
2410                 mmc_blk_put(md);
2411         }
2412 }
2413
2414 static void mmc_blk_remove_parts(struct mmc_card *card,
2415                                  struct mmc_blk_data *md)
2416 {
2417         struct list_head *pos, *q;
2418         struct mmc_blk_data *part_md;
2419
2420         __clear_bit(md->name_idx, name_use);
2421         list_for_each_safe(pos, q, &md->part) {
2422                 part_md = list_entry(pos, struct mmc_blk_data, part);
2423                 list_del(pos);
2424                 mmc_blk_remove_req(part_md);
2425         }
2426 }
2427
2428 static int mmc_add_disk(struct mmc_blk_data *md)
2429 {
2430         int ret;
2431         struct mmc_card *card = md->queue.card;
2432
2433         add_disk(md->disk);
2434         md->force_ro.show = force_ro_show;
2435         md->force_ro.store = force_ro_store;
2436         sysfs_attr_init(&md->force_ro.attr);
2437         md->force_ro.attr.name = "force_ro";
2438         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2439         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2440         if (ret)
2441                 goto force_ro_fail;
2442
2443         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2444              card->ext_csd.boot_ro_lockable) {
2445                 umode_t mode;
2446
2447                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2448                         mode = S_IRUGO;
2449                 else
2450                         mode = S_IRUGO | S_IWUSR;
2451
2452                 md->power_ro_lock.show = power_ro_lock_show;
2453                 md->power_ro_lock.store = power_ro_lock_store;
2454                 sysfs_attr_init(&md->power_ro_lock.attr);
2455                 md->power_ro_lock.attr.mode = mode;
2456                 md->power_ro_lock.attr.name =
2457                                         "ro_lock_until_next_power_on";
2458                 ret = device_create_file(disk_to_dev(md->disk),
2459                                 &md->power_ro_lock);
2460                 if (ret)
2461                         goto power_ro_lock_fail;
2462         }
2463         return ret;
2464
2465 power_ro_lock_fail:
2466         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2467 force_ro_fail:
2468         del_gendisk(md->disk);
2469
2470         return ret;
2471 }
2472
2473 #define CID_MANFID_SANDISK      0x2
2474 #define CID_MANFID_TOSHIBA      0x11
2475 #define CID_MANFID_MICRON       0x13
2476 #define CID_MANFID_SAMSUNG      0x15
2477 #define CID_MANFID_KINGSTON     0x70
2478
2479 static const struct mmc_fixup blk_fixups[] =
2480 {
2481         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2482                   MMC_QUIRK_INAND_CMD38),
2483         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2484                   MMC_QUIRK_INAND_CMD38),
2485         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2486                   MMC_QUIRK_INAND_CMD38),
2487         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2488                   MMC_QUIRK_INAND_CMD38),
2489         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2490                   MMC_QUIRK_INAND_CMD38),
2491
2492         /*
2493          * Some MMC cards experience performance degradation with CMD23
2494          * instead of CMD12-bounded multiblock transfers. For now we'll
2495          * black list what's bad...
2496          * - Certain Toshiba cards.
2497          *
2498          * N.B. This doesn't affect SD cards.
2499          */
2500         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2501                   MMC_QUIRK_BLK_NO_CMD23),
2502         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2503                   MMC_QUIRK_BLK_NO_CMD23),
2504         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2505                   MMC_QUIRK_BLK_NO_CMD23),
2506         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2507                   MMC_QUIRK_BLK_NO_CMD23),
2508         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2509                   MMC_QUIRK_BLK_NO_CMD23),
2510
2511         /*
2512          * Some Micron MMC cards needs longer data read timeout than
2513          * indicated in CSD.
2514          */
2515         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2516                   MMC_QUIRK_LONG_READ_TIME),
2517
2518         /*
2519          * On these Samsung MoviNAND parts, performing secure erase or
2520          * secure trim can result in unrecoverable corruption due to a
2521          * firmware bug.
2522          */
2523         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2524                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2525         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2526                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2527         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2528                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2529         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2530                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2531         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2532                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2533         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2534                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2535         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2536                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2537         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2538                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2539
2540         /*
2541          *  On Some Kingston eMMCs, performing trim can result in
2542          *  unrecoverable data conrruption occasionally due to a firmware bug.
2543          */
2544         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2545                   MMC_QUIRK_TRIM_BROKEN),
2546         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2547                   MMC_QUIRK_TRIM_BROKEN),
2548
2549         END_FIXUP
2550 };
2551
2552 extern struct mmc_card *this_card;
2553 static int mmc_blk_probe(struct mmc_card *card)
2554 {
2555         struct mmc_blk_data *md, *part_md;
2556         char cap_str[10];
2557
2558         /*
2559          * Check that the card supports the command class(es) we need.
2560          */
2561         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2562                 return -ENODEV;
2563
2564         mmc_fixup_device(card, blk_fixups);
2565
2566         md = mmc_blk_alloc(card);
2567         if (IS_ERR(md))
2568                 return PTR_ERR(md);
2569
2570         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2571                         cap_str, sizeof(cap_str));
2572         pr_info("%s: %s %s %s %s\n",
2573                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2574                 cap_str, md->read_only ? "(ro)" : "");
2575
2576         if (mmc_blk_alloc_parts(card, md))
2577                 goto out;
2578
2579         dev_set_drvdata(&card->dev, md);
2580
2581         #if defined(CONFIG_MMC_DW_ROCKCHIP)
2582         if (card->host->restrict_caps & RESTRICT_CARD_TYPE_EMMC) {
2583                 this_card = card;
2584                 md->disk->emmc_disk = 1;
2585         } else {
2586                 md->disk->emmc_disk = 0;
2587         }
2588         #endif
2589
2590         if (mmc_add_disk(md))
2591                 goto out;
2592
2593         list_for_each_entry(part_md, &md->part, part) {
2594                 if (mmc_add_disk(part_md))
2595                         goto out;
2596         }
2597
2598         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2599         pm_runtime_use_autosuspend(&card->dev);
2600
2601         /*
2602          * Don't enable runtime PM for SD-combo cards here. Leave that
2603          * decision to be taken during the SDIO init sequence instead.
2604          */
2605         if (card->type != MMC_TYPE_SD_COMBO) {
2606                 pm_runtime_set_active(&card->dev);
2607                 pm_runtime_enable(&card->dev);
2608         }
2609
2610         return 0;
2611
2612  out:
2613         mmc_blk_remove_parts(card, md);
2614         mmc_blk_remove_req(md);
2615         return 0;
2616 }
2617
2618 static void mmc_blk_remove(struct mmc_card *card)
2619 {
2620         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2621
2622         #if defined(CONFIG_MMC_DW_ROCKCHIP)
2623         if (card->host->restrict_caps & RESTRICT_CARD_TYPE_EMMC)
2624                 this_card = NULL;
2625         #endif
2626
2627         mmc_blk_remove_parts(card, md);
2628         pm_runtime_get_sync(&card->dev);
2629         mmc_claim_host(card->host);
2630         mmc_blk_part_switch(card, md);
2631         mmc_release_host(card->host);
2632         if (card->type != MMC_TYPE_SD_COMBO)
2633                 pm_runtime_disable(&card->dev);
2634         pm_runtime_put_noidle(&card->dev);
2635         mmc_blk_remove_req(md);
2636         dev_set_drvdata(&card->dev, NULL);
2637 }
2638
2639 static int _mmc_blk_suspend(struct mmc_card *card)
2640 {
2641         struct mmc_blk_data *part_md;
2642         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2643
2644         if (md) {
2645                 mmc_queue_suspend(&md->queue);
2646                 list_for_each_entry(part_md, &md->part, part) {
2647                         mmc_queue_suspend(&part_md->queue);
2648                 }
2649         }
2650         return 0;
2651 }
2652
2653 static void mmc_blk_shutdown(struct mmc_card *card)
2654 {
2655         _mmc_blk_suspend(card);
2656 }
2657
2658 #ifdef CONFIG_PM_SLEEP
2659 static int mmc_blk_suspend(struct device *dev)
2660 {
2661         struct mmc_card *card = mmc_dev_to_card(dev);
2662
2663         return _mmc_blk_suspend(card);
2664 }
2665
2666 static int mmc_blk_resume(struct device *dev)
2667 {
2668         struct mmc_blk_data *part_md;
2669         struct mmc_blk_data *md = dev_get_drvdata(dev);
2670
2671         if (md) {
2672                 /*
2673                  * Resume involves the card going into idle state,
2674                  * so current partition is always the main one.
2675                  */
2676                 md->part_curr = md->part_type;
2677                 mmc_queue_resume(&md->queue);
2678                 list_for_each_entry(part_md, &md->part, part) {
2679                         mmc_queue_resume(&part_md->queue);
2680                 }
2681         }
2682         return 0;
2683 }
2684 #endif
2685
2686 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2687
2688 static struct mmc_driver mmc_driver = {
2689         .drv            = {
2690                 .name   = "mmcblk",
2691                 .pm     = &mmc_blk_pm_ops,
2692         },
2693         .probe          = mmc_blk_probe,
2694         .remove         = mmc_blk_remove,
2695         .shutdown       = mmc_blk_shutdown,
2696 };
2697
2698 static int __init mmc_blk_init(void)
2699 {
2700         int res;
2701
2702         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2703                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2704
2705         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2706
2707         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2708         if (res)
2709                 goto out;
2710
2711         res = mmc_register_driver(&mmc_driver);
2712         if (res)
2713                 goto out2;
2714
2715         return 0;
2716  out2:
2717         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2718  out:
2719         return res;
2720 }
2721
2722 static void __exit mmc_blk_exit(void)
2723 {
2724         mmc_unregister_driver(&mmc_driver);
2725         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2726 }
2727
2728 module_init(mmc_blk_init);
2729 module_exit(mmc_blk_exit);
2730
2731 MODULE_LICENSE("GPL");
2732 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2733