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 #include <linux/idr.h>
  39
  40 #include <linux/mmc/ioctl.h>
  41 #include <linux/mmc/card.h>
  42 #include <linux/mmc/host.h>
  43 #include <linux/mmc/mmc.h>
  44 #include <linux/mmc/sd.h>
  45
  46 #include <asm/uaccess.h>
  47
  48 #include "queue.h"
  49 #include "block.h"
  50
  51 MODULE_ALIAS("mmc:block");
  52 #ifdef MODULE_PARAM_PREFIX
  53 #undef MODULE_PARAM_PREFIX
  54 #endif
  55 #define MODULE_PARAM_PREFIX "mmcblk."
  56
  57 #define INAND_CMD38_ARG_EXT_CSD  113
  58 #define INAND_CMD38_ARG_ERASE    0x00
  59 #define INAND_CMD38_ARG_TRIM     0x01
  60 #define INAND_CMD38_ARG_SECERASE 0x80
  61 #define INAND_CMD38_ARG_SECTRIM1 0x81
  62 #define INAND_CMD38_ARG_SECTRIM2 0x88
  63 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  64 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  65 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  66
  67 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  68                                   (rq_data_dir(req) == WRITE))
  69 #define PACKED_CMD_VER  0x01
  70 #define PACKED_CMD_WR   0x02
  71
  72 static DEFINE_MUTEX(block_mutex);
  73
  74 /*
  75  * The defaults come from config options but can be overriden by module
  76  * or bootarg options.
  77  */
  78 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  79
  80 /*
  81  * We've only got one major, so number of mmcblk devices is
  82  * limited to (1 << 20) / number of minors per device.  It is also
  83  * limited by the MAX_DEVICES below.
  84  */
  85 static int max_devices;
  86
  87 #define MAX_DEVICES 256
  88
  89 static DEFINE_IDA(mmc_blk_ida);
  90 static DEFINE_SPINLOCK(mmc_blk_lock);
  91
  92 /*
  93  * There is one mmc_blk_data per slot.
  94  */
  95 struct mmc_blk_data {
  96         spinlock_t      lock;
  97         struct device   *parent;
  98         struct gendisk  *disk;
  99         struct mmc_queue queue;
 100         struct list_head part;
 101
 102         unsigned int    flags;
 103 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 104 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 105 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 106
 107         unsigned int    usage;
 108         unsigned int    read_only;
 109         unsigned int    part_type;
 110         unsigned int    reset_done;
 111 #define MMC_BLK_READ            BIT(0)
 112 #define MMC_BLK_WRITE           BIT(1)
 113 #define MMC_BLK_DISCARD         BIT(2)
 114 #define MMC_BLK_SECDISCARD      BIT(3)
 115
 116         /*
 117          * Only set in main mmc_blk_data associated
 118          * with mmc_card with dev_set_drvdata, and keeps
 119          * track of the current selected device partition.
 120          */
 121         unsigned int    part_curr;
 122         struct device_attribute force_ro;
 123         struct device_attribute power_ro_lock;
 124         int     area_type;
 125 };
 126
 127 static DEFINE_MUTEX(open_lock);
 128
 129 enum {
 130         MMC_PACKED_NR_IDX = -1,
 131         MMC_PACKED_NR_ZERO,
 132         MMC_PACKED_NR_SINGLE,
 133 };
 134
 135 module_param(perdev_minors, int, 0444);
 136 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 137
 138 static inline int mmc_blk_part_switch(struct mmc_card *card,
 139                                       struct mmc_blk_data *md);
 140 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 141
 142 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 143 {
 144         struct mmc_packed *packed = mqrq->packed;
 145
 146         mqrq->cmd_type = MMC_PACKED_NONE;
 147         packed->nr_entries = MMC_PACKED_NR_ZERO;
 148         packed->idx_failure = MMC_PACKED_NR_IDX;
 149         packed->retries = 0;
 150         packed->blocks = 0;
 151 }
 152
 153 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 154 {
 155         struct mmc_blk_data *md;
 156
 157         mutex_lock(&open_lock);
 158         md = disk->private_data;
 159         if (md && md->usage == 0)
 160                 md = NULL;
 161         if (md)
 162                 md->usage++;
 163         mutex_unlock(&open_lock);
 164
 165         return md;
 166 }
 167
 168 static inline int mmc_get_devidx(struct gendisk *disk)
 169 {
 170         int devidx = disk->first_minor / perdev_minors;
 171         return devidx;
 172 }
 173
 174 static void mmc_blk_put(struct mmc_blk_data *md)
 175 {
 176         mutex_lock(&open_lock);
 177         md->usage--;
 178         if (md->usage == 0) {
 179                 int devidx = mmc_get_devidx(md->disk);
 180                 blk_cleanup_queue(md->queue.queue);
 181
 182                 spin_lock(&mmc_blk_lock);
 183                 ida_remove(&mmc_blk_ida, devidx);
 184                 spin_unlock(&mmc_blk_lock);
 185
 186                 put_disk(md->disk);
 187                 kfree(md);
 188         }
 189         mutex_unlock(&open_lock);
 190 }
 191
 192 static ssize_t power_ro_lock_show(struct device *dev,
 193                 struct device_attribute *attr, char *buf)
 194 {
 195         int ret;
 196         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 197         struct mmc_card *card = md->queue.card;
 198         int locked = 0;
 199
 200         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 201                 locked = 2;
 202         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 203                 locked = 1;
 204
 205         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 206
 207         mmc_blk_put(md);
 208
 209         return ret;
 210 }
 211
 212 static ssize_t power_ro_lock_store(struct device *dev,
 213                 struct device_attribute *attr, const char *buf, size_t count)
 214 {
 215         int ret;
 216         struct mmc_blk_data *md, *part_md;
 217         struct mmc_card *card;
 218         unsigned long set;
 219
 220         if (kstrtoul(buf, 0, &set))
 221                 return -EINVAL;
 222
 223         if (set != 1)
 224                 return count;
 225
 226         md = mmc_blk_get(dev_to_disk(dev));
 227         card = md->queue.card;
 228
 229         mmc_get_card(card);
 230
 231         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 232                                 card->ext_csd.boot_ro_lock |
 233                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 234                                 card->ext_csd.part_time);
 235         if (ret)
 236                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 237         else
 238                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 239
 240         mmc_put_card(card);
 241
 242         if (!ret) {
 243                 pr_info("%s: Locking boot partition ro until next power on\n",
 244                         md->disk->disk_name);
 245                 set_disk_ro(md->disk, 1);
 246
 247                 list_for_each_entry(part_md, &md->part, part)
 248                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 249                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 250                                 set_disk_ro(part_md->disk, 1);
 251                         }
 252         }
 253
 254         mmc_blk_put(md);
 255         return count;
 256 }
 257
 258 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 259                              char *buf)
 260 {
 261         int ret;
 262         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 263
 264         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 265                        get_disk_ro(dev_to_disk(dev)) ^
 266                        md->read_only);
 267         mmc_blk_put(md);
 268         return ret;
 269 }
 270
 271 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 272                               const char *buf, size_t count)
 273 {
 274         int ret;
 275         char *end;
 276         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 277         unsigned long set = simple_strtoul(buf, &end, 0);
 278         if (end == buf) {
 279                 ret = -EINVAL;
 280                 goto out;
 281         }
 282
 283         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 284         ret = count;
 285 out:
 286         mmc_blk_put(md);
 287         return ret;
 288 }
 289
 290 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 291 {
 292         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 293         int ret = -ENXIO;
 294
 295         mutex_lock(&block_mutex);
 296         if (md) {
 297                 if (md->usage == 2)
 298                         check_disk_change(bdev);
 299                 ret = 0;
 300
 301                 if ((mode & FMODE_WRITE) && md->read_only) {
 302                         mmc_blk_put(md);
 303                         ret = -EROFS;
 304                 }
 305         }
 306         mutex_unlock(&block_mutex);
 307
 308         return ret;
 309 }
 310
 311 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 312 {
 313         struct mmc_blk_data *md = disk->private_data;
 314
 315         mutex_lock(&block_mutex);
 316         mmc_blk_put(md);
 317         mutex_unlock(&block_mutex);
 318 }
 319
 320 static int
 321 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 322 {
 323         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 324         geo->heads = 4;
 325         geo->sectors = 16;
 326         return 0;
 327 }
 328
 329 struct mmc_blk_ioc_data {
 330         struct mmc_ioc_cmd ic;
 331         unsigned char *buf;
 332         u64 buf_bytes;
 333 };
 334
 335 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 336         struct mmc_ioc_cmd __user *user)
 337 {
 338         struct mmc_blk_ioc_data *idata;
 339         int err;
 340
 341         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 342         if (!idata) {
 343                 err = -ENOMEM;
 344                 goto out;
 345         }
 346
 347         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 348                 err = -EFAULT;
 349                 goto idata_err;
 350         }
 351
 352         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 353         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 354                 err = -EOVERFLOW;
 355                 goto idata_err;
 356         }
 357
 358         if (!idata->buf_bytes) {
 359                 idata->buf = NULL;
 360                 return idata;
 361         }
 362
 363         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 364         if (!idata->buf) {
 365                 err = -ENOMEM;
 366                 goto idata_err;
 367         }
 368
 369         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 370                                         idata->ic.data_ptr, idata->buf_bytes)) {
 371                 err = -EFAULT;
 372                 goto copy_err;
 373         }
 374
 375         return idata;
 376
 377 copy_err:
 378         kfree(idata->buf);
 379 idata_err:
 380         kfree(idata);
 381 out:
 382         return ERR_PTR(err);
 383 }
 384
 385 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 386                                       struct mmc_blk_ioc_data *idata)
 387 {
 388         struct mmc_ioc_cmd *ic = &idata->ic;
 389
 390         if (copy_to_user(&(ic_ptr->response), ic->response,
 391                          sizeof(ic->response)))
 392                 return -EFAULT;
 393
 394         if (!idata->ic.write_flag) {
 395                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 396                                  idata->buf, idata->buf_bytes))
 397                         return -EFAULT;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 404                                        u32 retries_max)
 405 {
 406         int err;
 407         u32 retry_count = 0;
 408
 409         if (!status || !retries_max)
 410                 return -EINVAL;
 411
 412         do {
 413                 err = get_card_status(card, status, 5);
 414                 if (err)
 415                         break;
 416
 417                 if (!R1_STATUS(*status) &&
 418                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 419                         break; /* RPMB programming operation complete */
 420
 421                 /*
 422                  * Rechedule to give the MMC device a chance to continue
 423                  * processing the previous command without being polled too
 424                  * frequently.
 425                  */
 426                 usleep_range(1000, 5000);
 427         } while (++retry_count < retries_max);
 428
 429         if (retry_count == retries_max)
 430                 err = -EPERM;
 431
 432         return err;
 433 }
 434
 435 static int ioctl_do_sanitize(struct mmc_card *card)
 436 {
 437         int err;
 438
 439         if (!mmc_can_sanitize(card)) {
 440                         pr_warn("%s: %s - SANITIZE is not supported\n",
 441                                 mmc_hostname(card->host), __func__);
 442                         err = -EOPNOTSUPP;
 443                         goto out;
 444         }
 445
 446         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 447                 mmc_hostname(card->host), __func__);
 448
 449         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 450                                         EXT_CSD_SANITIZE_START, 1,
 451                                         MMC_SANITIZE_REQ_TIMEOUT);
 452
 453         if (err)
 454                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 455                        mmc_hostname(card->host), __func__, err);
 456
 457         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 458                                              __func__);
 459 out:
 460         return err;
 461 }
 462
 463 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 464                                struct mmc_blk_ioc_data *idata)
 465 {
 466         struct mmc_command cmd = {0};
 467         struct mmc_data data = {0};
 468         struct mmc_request mrq = {NULL};
 469         struct scatterlist sg;
 470         int err;
 471         int is_rpmb = false;
 472         u32 status = 0;
 473
 474         if (!card || !md || !idata)
 475                 return -EINVAL;
 476
 477         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 478                 is_rpmb = true;
 479
 480         cmd.opcode = idata->ic.opcode;
 481         cmd.arg = idata->ic.arg;
 482         cmd.flags = idata->ic.flags;
 483
 484         if (idata->buf_bytes) {
 485                 data.sg = &sg;
 486                 data.sg_len = 1;
 487                 data.blksz = idata->ic.blksz;
 488                 data.blocks = idata->ic.blocks;
 489
 490                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 491
 492                 if (idata->ic.write_flag)
 493                         data.flags = MMC_DATA_WRITE;
 494                 else
 495                         data.flags = MMC_DATA_READ;
 496
 497                 /* data.flags must already be set before doing this. */
 498                 mmc_set_data_timeout(&data, card);
 499
 500                 /* Allow overriding the timeout_ns for empirical tuning. */
 501                 if (idata->ic.data_timeout_ns)
 502                         data.timeout_ns = idata->ic.data_timeout_ns;
 503
 504                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 505                         /*
 506                          * Pretend this is a data transfer and rely on the
 507                          * host driver to compute timeout.  When all host
 508                          * drivers support cmd.cmd_timeout for R1B, this
 509                          * can be changed to:
 510                          *
 511                          *     mrq.data = NULL;
 512                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 513                          */
 514                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 515                 }
 516
 517                 mrq.data = &data;
 518         }
 519
 520         mrq.cmd = &cmd;
 521
 522         err = mmc_blk_part_switch(card, md);
 523         if (err)
 524                 return err;
 525
 526         if (idata->ic.is_acmd) {
 527                 err = mmc_app_cmd(card->host, card);
 528                 if (err)
 529                         return err;
 530         }
 531
 532         if (is_rpmb) {
 533                 err = mmc_set_blockcount(card, data.blocks,
 534                         idata->ic.write_flag & (1 << 31));
 535                 if (err)
 536                         return err;
 537         }
 538
 539         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 540             (cmd.opcode == MMC_SWITCH)) {
 541                 err = ioctl_do_sanitize(card);
 542
 543                 if (err)
 544                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 545                                __func__, err);
 546
 547                 return err;
 548         }
 549
 550         mmc_wait_for_req(card->host, &mrq);
 551
 552         if (cmd.error) {
 553                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 554                                                 __func__, cmd.error);
 555                 return cmd.error;
 556         }
 557         if (data.error) {
 558                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 559                                                 __func__, data.error);
 560                 return data.error;
 561         }
 562
 563         /*
 564          * According to the SD specs, some commands require a delay after
 565          * issuing the command.
 566          */
 567         if (idata->ic.postsleep_min_us)
 568                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 569
 570         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 571
 572         if (is_rpmb) {
 573                 /*
 574                  * Ensure RPMB command has completed by polling CMD13
 575                  * "Send Status".
 576                  */
 577                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 578                 if (err)
 579                         dev_err(mmc_dev(card->host),
 580                                         "%s: Card Status=0x%08X, error %d\n",
 581                                         __func__, status, err);
 582         }
 583
 584         return err;
 585 }
 586
 587 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 588                              struct mmc_ioc_cmd __user *ic_ptr)
 589 {
 590         struct mmc_blk_ioc_data *idata;
 591         struct mmc_blk_data *md;
 592         struct mmc_card *card;
 593         int err = 0, ioc_err = 0;
 594
 595         /*
 596          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 597          * whole block device, not on a partition.  This prevents overspray
 598          * between sibling partitions.
 599          */
 600         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 601                 return -EPERM;
 602
 603         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 604         if (IS_ERR(idata))
 605                 return PTR_ERR(idata);
 606
 607         md = mmc_blk_get(bdev->bd_disk);
 608         if (!md) {
 609                 err = -EINVAL;
 610                 goto cmd_err;
 611         }
 612
 613         card = md->queue.card;
 614         if (IS_ERR(card)) {
 615                 err = PTR_ERR(card);
 616                 goto cmd_done;
 617         }
 618
 619         mmc_get_card(card);
 620
 621         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 622
 623         /* Always switch back to main area after RPMB access */
 624         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 625                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 626
 627         mmc_put_card(card);
 628
 629         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 630
 631 cmd_done:
 632         mmc_blk_put(md);
 633 cmd_err:
 634         kfree(idata->buf);
 635         kfree(idata);
 636         return ioc_err ? ioc_err : err;
 637 }
 638
 639 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 640                                    struct mmc_ioc_multi_cmd __user *user)
 641 {
 642         struct mmc_blk_ioc_data **idata = NULL;
 643         struct mmc_ioc_cmd __user *cmds = user->cmds;
 644         struct mmc_card *card;
 645         struct mmc_blk_data *md;
 646         int i, err = 0, ioc_err = 0;
 647         __u64 num_of_cmds;
 648
 649         /*
 650          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 651          * whole block device, not on a partition.  This prevents overspray
 652          * between sibling partitions.
 653          */
 654         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 655                 return -EPERM;
 656
 657         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 658                            sizeof(num_of_cmds)))
 659                 return -EFAULT;
 660
 661         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 662                 return -EINVAL;
 663
 664         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 665         if (!idata)
 666                 return -ENOMEM;
 667
 668         for (i = 0; i < num_of_cmds; i++) {
 669                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 670                 if (IS_ERR(idata[i])) {
 671                         err = PTR_ERR(idata[i]);
 672                         num_of_cmds = i;
 673                         goto cmd_err;
 674                 }
 675         }
 676
 677         md = mmc_blk_get(bdev->bd_disk);
 678         if (!md) {
 679                 err = -EINVAL;
 680                 goto cmd_err;
 681         }
 682
 683         card = md->queue.card;
 684         if (IS_ERR(card)) {
 685                 err = PTR_ERR(card);
 686                 goto cmd_done;
 687         }
 688
 689         mmc_get_card(card);
 690
 691         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 692                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 693
 694         /* Always switch back to main area after RPMB access */
 695         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 696                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 697
 698         mmc_put_card(card);
 699
 700         /* copy to user if data and response */
 701         for (i = 0; i < num_of_cmds && !err; i++)
 702                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 703
 704 cmd_done:
 705         mmc_blk_put(md);
 706 cmd_err:
 707         for (i = 0; i < num_of_cmds; i++) {
 708                 kfree(idata[i]->buf);
 709                 kfree(idata[i]);
 710         }
 711         kfree(idata);
 712         return ioc_err ? ioc_err : err;
 713 }
 714
 715 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 716         unsigned int cmd, unsigned long arg)
 717 {
 718         switch (cmd) {
 719         case MMC_IOC_CMD:
 720                 return mmc_blk_ioctl_cmd(bdev,
 721                                 (struct mmc_ioc_cmd __user *)arg);
 722         case MMC_IOC_MULTI_CMD:
 723                 return mmc_blk_ioctl_multi_cmd(bdev,
 724                                 (struct mmc_ioc_multi_cmd __user *)arg);
 725         default:
 726                 return -EINVAL;
 727         }
 728 }
 729
 730 #ifdef CONFIG_COMPAT
 731 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 732         unsigned int cmd, unsigned long arg)
 733 {
 734         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 735 }
 736 #endif
 737
 738 static const struct block_device_operations mmc_bdops = {
 739         .open                   = mmc_blk_open,
 740         .release                = mmc_blk_release,
 741         .getgeo                 = mmc_blk_getgeo,
 742         .owner                  = THIS_MODULE,
 743         .ioctl                  = mmc_blk_ioctl,
 744 #ifdef CONFIG_COMPAT
 745         .compat_ioctl           = mmc_blk_compat_ioctl,
 746 #endif
 747 };
 748
 749 static inline int mmc_blk_part_switch(struct mmc_card *card,
 750                                       struct mmc_blk_data *md)
 751 {
 752         int ret;
 753         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 754
 755         if (main_md->part_curr == md->part_type)
 756                 return 0;
 757
 758         if (mmc_card_mmc(card)) {
 759                 u8 part_config = card->ext_csd.part_config;
 760
 761                 if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 762                         mmc_retune_pause(card->host);
 763
 764                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 765                 part_config |= md->part_type;
 766
 767                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 768                                  EXT_CSD_PART_CONFIG, part_config,
 769                                  card->ext_csd.part_time);
 770                 if (ret) {
 771                         if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 772                                 mmc_retune_unpause(card->host);
 773                         return ret;
 774                 }
 775
 776                 card->ext_csd.part_config = part_config;
 777
 778                 if (main_md->part_curr == EXT_CSD_PART_CONFIG_ACC_RPMB)
 779                         mmc_retune_unpause(card->host);
 780         }
 781
 782         main_md->part_curr = md->part_type;
 783         return 0;
 784 }
 785
 786 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 787 {
 788         int err;
 789         u32 result;
 790         __be32 *blocks;
 791
 792         struct mmc_request mrq = {NULL};
 793         struct mmc_command cmd = {0};
 794         struct mmc_data data = {0};
 795
 796         struct scatterlist sg;
 797
 798         cmd.opcode = MMC_APP_CMD;
 799         cmd.arg = card->rca << 16;
 800         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 801
 802         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 803         if (err)
 804                 return (u32)-1;
 805         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 806                 return (u32)-1;
 807
 808         memset(&cmd, 0, sizeof(struct mmc_command));
 809
 810         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 811         cmd.arg = 0;
 812         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 813
 814         data.blksz = 4;
 815         data.blocks = 1;
 816         data.flags = MMC_DATA_READ;
 817         data.sg = &sg;
 818         data.sg_len = 1;
 819         mmc_set_data_timeout(&data, card);
 820
 821         mrq.cmd = &cmd;
 822         mrq.data = &data;
 823
 824         blocks = kmalloc(4, GFP_KERNEL);
 825         if (!blocks)
 826                 return (u32)-1;
 827
 828         sg_init_one(&sg, blocks, 4);
 829
 830         mmc_wait_for_req(card->host, &mrq);
 831
 832         result = ntohl(*blocks);
 833         kfree(blocks);
 834
 835         if (cmd.error || data.error)
 836                 result = (u32)-1;
 837
 838         return result;
 839 }
 840
 841 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 842 {
 843         struct mmc_command cmd = {0};
 844         int err;
 845
 846         cmd.opcode = MMC_SEND_STATUS;
 847         if (!mmc_host_is_spi(card->host))
 848                 cmd.arg = card->rca << 16;
 849         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 850         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 851         if (err == 0)
 852                 *status = cmd.resp[0];
 853         return err;
 854 }
 855
 856 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 857                 bool hw_busy_detect, struct request *req, int *gen_err)
 858 {
 859         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 860         int err = 0;
 861         u32 status;
 862
 863         do {
 864                 err = get_card_status(card, &status, 5);
 865                 if (err) {
 866                         pr_err("%s: error %d requesting status\n",
 867                                req->rq_disk->disk_name, err);
 868                         return err;
 869                 }
 870
 871                 if (status & R1_ERROR) {
 872                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 873                                 req->rq_disk->disk_name, __func__, status);
 874                         *gen_err = 1;
 875                 }
 876
 877                 /* We may rely on the host hw to handle busy detection.*/
 878                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 879                         hw_busy_detect)
 880                         break;
 881
 882                 /*
 883                  * Timeout if the device never becomes ready for data and never
 884                  * leaves the program state.
 885                  */
 886                 if (time_after(jiffies, timeout)) {
 887                         pr_err("%s: Card stuck in programming state! %s %s\n",
 888                                 mmc_hostname(card->host),
 889                                 req->rq_disk->disk_name, __func__);
 890                         return -ETIMEDOUT;
 891                 }
 892
 893                 /*
 894                  * Some cards mishandle the status bits,
 895                  * so make sure to check both the busy
 896                  * indication and the card state.
 897                  */
 898         } while (!(status & R1_READY_FOR_DATA) ||
 899                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 900
 901         return err;
 902 }
 903
 904 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 905                 struct request *req, int *gen_err, u32 *stop_status)
 906 {
 907         struct mmc_host *host = card->host;
 908         struct mmc_command cmd = {0};
 909         int err;
 910         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 911
 912         /*
 913          * Normally we use R1B responses for WRITE, but in cases where the host
 914          * has specified a max_busy_timeout we need to validate it. A failure
 915          * means we need to prevent the host from doing hw busy detection, which
 916          * is done by converting to a R1 response instead.
 917          */
 918         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 919                 use_r1b_resp = false;
 920
 921         cmd.opcode = MMC_STOP_TRANSMISSION;
 922         if (use_r1b_resp) {
 923                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 924                 cmd.busy_timeout = timeout_ms;
 925         } else {
 926                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 927         }
 928
 929         err = mmc_wait_for_cmd(host, &cmd, 5);
 930         if (err)
 931                 return err;
 932
 933         *stop_status = cmd.resp[0];
 934
 935         /* No need to check card status in case of READ. */
 936         if (rq_data_dir(req) == READ)
 937                 return 0;
 938
 939         if (!mmc_host_is_spi(host) &&
 940                 (*stop_status & R1_ERROR)) {
 941                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 942                         req->rq_disk->disk_name, __func__, *stop_status);
 943                 *gen_err = 1;
 944         }
 945
 946         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 947 }
 948
 949 #define ERR_NOMEDIUM    3
 950 #define ERR_RETRY       2
 951 #define ERR_ABORT       1
 952 #define ERR_CONTINUE    0
 953
 954 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 955         bool status_valid, u32 status)
 956 {
 957         switch (error) {
 958         case -EILSEQ:
 959                 /* response crc error, retry the r/w cmd */
 960                 pr_err("%s: %s sending %s command, card status %#x\n",
 961                         req->rq_disk->disk_name, "response CRC error",
 962                         name, status);
 963                 return ERR_RETRY;
 964
 965         case -ETIMEDOUT:
 966                 pr_err("%s: %s sending %s command, card status %#x\n",
 967                         req->rq_disk->disk_name, "timed out", name, status);
 968
 969                 /* If the status cmd initially failed, retry the r/w cmd */
 970                 if (!status_valid) {
 971                         pr_err("%s: status not valid, retrying timeout\n",
 972                                 req->rq_disk->disk_name);
 973                         return ERR_RETRY;
 974                 }
 975
 976                 /*
 977                  * If it was a r/w cmd crc error, or illegal command
 978                  * (eg, issued in wrong state) then retry - we should
 979                  * have corrected the state problem above.
 980                  */
 981                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 982                         pr_err("%s: command error, retrying timeout\n",
 983                                 req->rq_disk->disk_name);
 984                         return ERR_RETRY;
 985                 }
 986
 987                 /* Otherwise abort the command */
 988                 return ERR_ABORT;
 989
 990         default:
 991                 /* We don't understand the error code the driver gave us */
 992                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 993                        req->rq_disk->disk_name, error, status);
 994                 return ERR_ABORT;
 995         }
 996 }
 997
 998 /*
 999  * Initial r/w and stop cmd error recovery.
1000  * We don't know whether the card received the r/w cmd or not, so try to
1001  * restore things back to a sane state.  Essentially, we do this as follows:
1002  * - Obtain card status.  If the first attempt to obtain card status fails,
1003  *   the status word will reflect the failed status cmd, not the failed
1004  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
1005  *   longer communicate with the card.
1006  * - Check the card state.  If the card received the cmd but there was a
1007  *   transient problem with the response, it might still be in a data transfer
1008  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
1009  * - If the r/w cmd failed due to a response CRC error, it was probably
1010  *   transient, so retry the cmd.
1011  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
1012  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
1013  *   illegal cmd, retry.
1014  * Otherwise we don't understand what happened, so abort.
1015  */
1016 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
1017         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
1018 {
1019         bool prev_cmd_status_valid = true;
1020         u32 status, stop_status = 0;
1021         int err, retry;
1022
1023         if (mmc_card_removed(card))
1024                 return ERR_NOMEDIUM;
1025
1026         /*
1027          * Try to get card status which indicates both the card state
1028          * and why there was no response.  If the first attempt fails,
1029          * we can't be sure the returned status is for the r/w command.
1030          */
1031         for (retry = 2; retry >= 0; retry--) {
1032                 err = get_card_status(card, &status, 0);
1033                 if (!err)
1034                         break;
1035
1036                 /* Re-tune if needed */
1037                 mmc_retune_recheck(card->host);
1038
1039                 prev_cmd_status_valid = false;
1040                 pr_err("%s: error %d sending status command, %sing\n",
1041                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1042         }
1043
1044         /* We couldn't get a response from the card.  Give up. */
1045         if (err) {
1046                 /* Check if the card is removed */
1047                 if (mmc_detect_card_removed(card->host))
1048                         return ERR_NOMEDIUM;
1049                 return ERR_ABORT;
1050         }
1051
1052         /* Flag ECC errors */
1053         if ((status & R1_CARD_ECC_FAILED) ||
1054             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1055             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1056                 *ecc_err = 1;
1057
1058         /* Flag General errors */
1059         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1060                 if ((status & R1_ERROR) ||
1061                         (brq->stop.resp[0] & R1_ERROR)) {
1062                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1063                                req->rq_disk->disk_name, __func__,
1064                                brq->stop.resp[0], status);
1065                         *gen_err = 1;
1066                 }
1067
1068         /*
1069          * Check the current card state.  If it is in some data transfer
1070          * mode, tell it to stop (and hopefully transition back to TRAN.)
1071          */
1072         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1073             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1074                 err = send_stop(card,
1075                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1076                         req, gen_err, &stop_status);
1077                 if (err) {
1078                         pr_err("%s: error %d sending stop command\n",
1079                                req->rq_disk->disk_name, err);
1080                         /*
1081                          * If the stop cmd also timed out, the card is probably
1082                          * not present, so abort. Other errors are bad news too.
1083                          */
1084                         return ERR_ABORT;
1085                 }
1086
1087                 if (stop_status & R1_CARD_ECC_FAILED)
1088                         *ecc_err = 1;
1089         }
1090
1091         /* Check for set block count errors */
1092         if (brq->sbc.error)
1093                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1094                                 prev_cmd_status_valid, status);
1095
1096         /* Check for r/w command errors */
1097         if (brq->cmd.error)
1098                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1099                                 prev_cmd_status_valid, status);
1100
1101         /* Data errors */
1102         if (!brq->stop.error)
1103                 return ERR_CONTINUE;
1104
1105         /* Now for stop errors.  These aren't fatal to the transfer. */
1106         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1107                req->rq_disk->disk_name, brq->stop.error,
1108                brq->cmd.resp[0], status);
1109
1110         /*
1111          * Subsitute in our own stop status as this will give the error
1112          * state which happened during the execution of the r/w command.
1113          */
1114         if (stop_status) {
1115                 brq->stop.resp[0] = stop_status;
1116                 brq->stop.error = 0;
1117         }
1118         return ERR_CONTINUE;
1119 }
1120
1121 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1122                          int type)
1123 {
1124         int err;
1125
1126         if (md->reset_done & type)
1127                 return -EEXIST;
1128
1129         md->reset_done |= type;
1130         err = mmc_hw_reset(host);
1131         /* Ensure we switch back to the correct partition */
1132         if (err != -EOPNOTSUPP) {
1133                 struct mmc_blk_data *main_md =
1134                         dev_get_drvdata(&host->card->dev);
1135                 int part_err;
1136
1137                 main_md->part_curr = main_md->part_type;
1138                 part_err = mmc_blk_part_switch(host->card, md);
1139                 if (part_err) {
1140                         /*
1141                          * We have failed to get back into the correct
1142                          * partition, so we need to abort the whole request.
1143                          */
1144                         return -ENODEV;
1145                 }
1146         }
1147         return err;
1148 }
1149
1150 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1151 {
1152         md->reset_done &= ~type;
1153 }
1154
1155 int mmc_access_rpmb(struct mmc_queue *mq)
1156 {
1157         struct mmc_blk_data *md = mq->data;
1158         /*
1159          * If this is a RPMB partition access, return ture
1160          */
1161         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1162                 return true;
1163
1164         return false;
1165 }
1166
1167 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1168 {
1169         struct mmc_blk_data *md = mq->data;
1170         struct mmc_card *card = md->queue.card;
1171         unsigned int from, nr, arg;
1172         int err = 0, type = MMC_BLK_DISCARD;
1173
1174         if (!mmc_can_erase(card)) {
1175                 err = -EOPNOTSUPP;
1176                 goto out;
1177         }
1178
1179         from = blk_rq_pos(req);
1180         nr = blk_rq_sectors(req);
1181
1182         if (mmc_can_discard(card))
1183                 arg = MMC_DISCARD_ARG;
1184         else if (mmc_can_trim(card))
1185                 arg = MMC_TRIM_ARG;
1186         else
1187                 arg = MMC_ERASE_ARG;
1188 retry:
1189         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1190                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1191                                  INAND_CMD38_ARG_EXT_CSD,
1192                                  arg == MMC_TRIM_ARG ?
1193                                  INAND_CMD38_ARG_TRIM :
1194                                  INAND_CMD38_ARG_ERASE,
1195                                  0);
1196                 if (err)
1197                         goto out;
1198         }
1199         err = mmc_erase(card, from, nr, arg);
1200 out:
1201         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1202                 goto retry;
1203         if (!err)
1204                 mmc_blk_reset_success(md, type);
1205         blk_end_request(req, err, blk_rq_bytes(req));
1206
1207         return err ? 0 : 1;
1208 }
1209
1210 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1211                                        struct request *req)
1212 {
1213         struct mmc_blk_data *md = mq->data;
1214         struct mmc_card *card = md->queue.card;
1215         unsigned int from, nr, arg;
1216         int err = 0, type = MMC_BLK_SECDISCARD;
1217
1218         if (!(mmc_can_secure_erase_trim(card))) {
1219                 err = -EOPNOTSUPP;
1220                 goto out;
1221         }
1222
1223         from = blk_rq_pos(req);
1224         nr = blk_rq_sectors(req);
1225
1226         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1227                 arg = MMC_SECURE_TRIM1_ARG;
1228         else
1229                 arg = MMC_SECURE_ERASE_ARG;
1230
1231 retry:
1232         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1233                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1234                                  INAND_CMD38_ARG_EXT_CSD,
1235                                  arg == MMC_SECURE_TRIM1_ARG ?
1236                                  INAND_CMD38_ARG_SECTRIM1 :
1237                                  INAND_CMD38_ARG_SECERASE,
1238                                  0);
1239                 if (err)
1240                         goto out_retry;
1241         }
1242
1243         err = mmc_erase(card, from, nr, arg);
1244         if (err == -EIO)
1245                 goto out_retry;
1246         if (err)
1247                 goto out;
1248
1249         if (arg == MMC_SECURE_TRIM1_ARG) {
1250                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1251                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1252                                          INAND_CMD38_ARG_EXT_CSD,
1253                                          INAND_CMD38_ARG_SECTRIM2,
1254                                          0);
1255                         if (err)
1256                                 goto out_retry;
1257                 }
1258
1259                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1260                 if (err == -EIO)
1261                         goto out_retry;
1262                 if (err)
1263                         goto out;
1264         }
1265
1266 out_retry:
1267         if (err && !mmc_blk_reset(md, card->host, type))
1268                 goto retry;
1269         if (!err)
1270                 mmc_blk_reset_success(md, type);
1271 out:
1272         blk_end_request(req, err, blk_rq_bytes(req));
1273
1274         return err ? 0 : 1;
1275 }
1276
1277 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1278 {
1279         struct mmc_blk_data *md = mq->data;
1280         struct mmc_card *card = md->queue.card;
1281         int ret = 0;
1282
1283         ret = mmc_flush_cache(card);
1284         if (ret)
1285                 ret = -EIO;
1286
1287         blk_end_request_all(req, ret);
1288
1289         return ret ? 0 : 1;
1290 }
1291
1292 /*
1293  * Reformat current write as a reliable write, supporting
1294  * both legacy and the enhanced reliable write MMC cards.
1295  * In each transfer we'll handle only as much as a single
1296  * reliable write can handle, thus finish the request in
1297  * partial completions.
1298  */
1299 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1300                                     struct mmc_card *card,
1301                                     struct request *req)
1302 {
1303         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1304                 /* Legacy mode imposes restrictions on transfers. */
1305                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1306                         brq->data.blocks = 1;
1307
1308                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1309                         brq->data.blocks = card->ext_csd.rel_sectors;
1310                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1311                         brq->data.blocks = 1;
1312         }
1313 }
1314
1315 #define CMD_ERRORS                                                      \
1316         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1317          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1318          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1319          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1320          R1_CC_ERROR |          /* Card controller error */             \
1321          R1_ERROR)              /* General/unknown error */
1322
1323 static int mmc_blk_err_check(struct mmc_card *card,
1324                              struct mmc_async_req *areq)
1325 {
1326         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1327                                                     mmc_active);
1328         struct mmc_blk_request *brq = &mq_mrq->brq;
1329         struct request *req = mq_mrq->req;
1330         int need_retune = card->host->need_retune;
1331         int ecc_err = 0, gen_err = 0;
1332
1333         /*
1334          * sbc.error indicates a problem with the set block count
1335          * command.  No data will have been transferred.
1336          *
1337          * cmd.error indicates a problem with the r/w command.  No
1338          * data will have been transferred.
1339          *
1340          * stop.error indicates a problem with the stop command.  Data
1341          * may have been transferred, or may still be transferring.
1342          */
1343         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1344             brq->data.error) {
1345                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1346                 case ERR_RETRY:
1347                         return MMC_BLK_RETRY;
1348                 case ERR_ABORT:
1349                         return MMC_BLK_ABORT;
1350                 case ERR_NOMEDIUM:
1351                         return MMC_BLK_NOMEDIUM;
1352                 case ERR_CONTINUE:
1353                         break;
1354                 }
1355         }
1356
1357         /*
1358          * Check for errors relating to the execution of the
1359          * initial command - such as address errors.  No data
1360          * has been transferred.
1361          */
1362         if (brq->cmd.resp[0] & CMD_ERRORS) {
1363                 pr_err("%s: r/w command failed, status = %#x\n",
1364                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1365                 return MMC_BLK_ABORT;
1366         }
1367
1368         /*
1369          * Everything else is either success, or a data error of some
1370          * kind.  If it was a write, we may have transitioned to
1371          * program mode, which we have to wait for it to complete.
1372          */
1373         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1374                 int err;
1375
1376                 /* Check stop command response */
1377                 if (brq->stop.resp[0] & R1_ERROR) {
1378                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1379                                req->rq_disk->disk_name, __func__,
1380                                brq->stop.resp[0]);
1381                         gen_err = 1;
1382                 }
1383
1384                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1385                                         &gen_err);
1386                 if (err)
1387                         return MMC_BLK_CMD_ERR;
1388         }
1389
1390         /* if general error occurs, retry the write operation. */
1391         if (gen_err) {
1392                 pr_warn("%s: retrying write for general error\n",
1393                                 req->rq_disk->disk_name);
1394                 return MMC_BLK_RETRY;
1395         }
1396
1397         if (brq->data.error) {
1398                 if (need_retune && !brq->retune_retry_done) {
1399                         pr_debug("%s: retrying because a re-tune was needed\n",
1400                                  req->rq_disk->disk_name);
1401                         brq->retune_retry_done = 1;
1402                         return MMC_BLK_RETRY;
1403                 }
1404                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1405                        req->rq_disk->disk_name, brq->data.error,
1406                        (unsigned)blk_rq_pos(req),
1407                        (unsigned)blk_rq_sectors(req),
1408                        brq->cmd.resp[0], brq->stop.resp[0]);
1409
1410                 if (rq_data_dir(req) == READ) {
1411                         if (ecc_err)
1412                                 return MMC_BLK_ECC_ERR;
1413                         return MMC_BLK_DATA_ERR;
1414                 } else {
1415                         return MMC_BLK_CMD_ERR;
1416                 }
1417         }
1418
1419         if (!brq->data.bytes_xfered)
1420                 return MMC_BLK_RETRY;
1421
1422         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1423                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1424                         return MMC_BLK_PARTIAL;
1425                 else
1426                         return MMC_BLK_SUCCESS;
1427         }
1428
1429         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1430                 return MMC_BLK_PARTIAL;
1431
1432         return MMC_BLK_SUCCESS;
1433 }
1434
1435 static int mmc_blk_packed_err_check(struct mmc_card *card,
1436                                     struct mmc_async_req *areq)
1437 {
1438         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1439                         mmc_active);
1440         struct request *req = mq_rq->req;
1441         struct mmc_packed *packed = mq_rq->packed;
1442         int err, check, status;
1443         u8 *ext_csd;
1444
1445         packed->retries--;
1446         check = mmc_blk_err_check(card, areq);
1447         err = get_card_status(card, &status, 0);
1448         if (err) {
1449                 pr_err("%s: error %d sending status command\n",
1450                        req->rq_disk->disk_name, err);
1451                 return MMC_BLK_ABORT;
1452         }
1453
1454         if (status & R1_EXCEPTION_EVENT) {
1455                 err = mmc_get_ext_csd(card, &ext_csd);
1456                 if (err) {
1457                         pr_err("%s: error %d sending ext_csd\n",
1458                                req->rq_disk->disk_name, err);
1459                         return MMC_BLK_ABORT;
1460                 }
1461
1462                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1463                      EXT_CSD_PACKED_FAILURE) &&
1464                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1465                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1466                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1467                             EXT_CSD_PACKED_INDEXED_ERROR) {
1468                                 packed->idx_failure =
1469                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1470                                 check = MMC_BLK_PARTIAL;
1471                         }
1472                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1473                                "failure index: %d\n",
1474                                req->rq_disk->disk_name, packed->nr_entries,
1475                                packed->blocks, packed->idx_failure);
1476                 }
1477                 kfree(ext_csd);
1478         }
1479
1480         return check;
1481 }
1482
1483 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1484                                struct mmc_card *card,
1485                                int disable_multi,
1486                                struct mmc_queue *mq)
1487 {
1488         u32 readcmd, writecmd;
1489         struct mmc_blk_request *brq = &mqrq->brq;
1490         struct request *req = mqrq->req;
1491         struct mmc_blk_data *md = mq->data;
1492         bool do_data_tag;
1493
1494         /*
1495          * Reliable writes are used to implement Forced Unit Access and
1496          * are supported only on MMCs.
1497          */
1498         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1499                 (rq_data_dir(req) == WRITE) &&
1500                 (md->flags & MMC_BLK_REL_WR);
1501
1502         memset(brq, 0, sizeof(struct mmc_blk_request));
1503         brq->mrq.cmd = &brq->cmd;
1504         brq->mrq.data = &brq->data;
1505
1506         brq->cmd.arg = blk_rq_pos(req);
1507         if (!mmc_card_blockaddr(card))
1508                 brq->cmd.arg <<= 9;
1509         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1510         brq->data.blksz = 512;
1511         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1512         brq->stop.arg = 0;
1513         brq->data.blocks = blk_rq_sectors(req);
1514
1515         /*
1516          * The block layer doesn't support all sector count
1517          * restrictions, so we need to be prepared for too big
1518          * requests.
1519          */
1520         if (brq->data.blocks > card->host->max_blk_count)
1521                 brq->data.blocks = card->host->max_blk_count;
1522
1523         if (brq->data.blocks > 1) {
1524                 /*
1525                  * After a read error, we redo the request one sector
1526                  * at a time in order to accurately determine which
1527                  * sectors can be read successfully.
1528                  */
1529                 if (disable_multi)
1530                         brq->data.blocks = 1;
1531
1532                 /*
1533                  * Some controllers have HW issues while operating
1534                  * in multiple I/O mode
1535                  */
1536                 if (card->host->ops->multi_io_quirk)
1537                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1538                                                 (rq_data_dir(req) == READ) ?
1539                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1540                                                 brq->data.blocks);
1541         }
1542
1543         if (brq->data.blocks > 1 || do_rel_wr) {
1544                 /* SPI multiblock writes terminate using a special
1545                  * token, not a STOP_TRANSMISSION request.
1546                  */
1547                 if (!mmc_host_is_spi(card->host) ||
1548                     rq_data_dir(req) == READ)
1549                         brq->mrq.stop = &brq->stop;
1550                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1551                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1552         } else {
1553                 brq->mrq.stop = NULL;
1554                 readcmd = MMC_READ_SINGLE_BLOCK;
1555                 writecmd = MMC_WRITE_BLOCK;
1556         }
1557         if (rq_data_dir(req) == READ) {
1558                 brq->cmd.opcode = readcmd;
1559                 brq->data.flags = MMC_DATA_READ;
1560                 if (brq->mrq.stop)
1561                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1562                                         MMC_CMD_AC;
1563         } else {
1564                 brq->cmd.opcode = writecmd;
1565                 brq->data.flags = MMC_DATA_WRITE;
1566                 if (brq->mrq.stop)
1567                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1568                                         MMC_CMD_AC;
1569         }
1570
1571         if (do_rel_wr)
1572                 mmc_apply_rel_rw(brq, card, req);
1573
1574         /*
1575          * Data tag is used only during writing meta data to speed
1576          * up write and any subsequent read of this meta data
1577          */
1578         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1579                 (req->cmd_flags & REQ_META) &&
1580                 (rq_data_dir(req) == WRITE) &&
1581                 ((brq->data.blocks * brq->data.blksz) >=
1582                  card->ext_csd.data_tag_unit_size);
1583
1584         /*
1585          * Pre-defined multi-block transfers are preferable to
1586          * open ended-ones (and necessary for reliable writes).
1587          * However, it is not sufficient to just send CMD23,
1588          * and avoid the final CMD12, as on an error condition
1589          * CMD12 (stop) needs to be sent anyway. This, coupled
1590          * with Auto-CMD23 enhancements provided by some
1591          * hosts, means that the complexity of dealing
1592          * with this is best left to the host. If CMD23 is
1593          * supported by card and host, we'll fill sbc in and let
1594          * the host deal with handling it correctly. This means
1595          * that for hosts that don't expose MMC_CAP_CMD23, no
1596          * change of behavior will be observed.
1597          *
1598          * N.B: Some MMC cards experience perf degradation.
1599          * We'll avoid using CMD23-bounded multiblock writes for
1600          * these, while retaining features like reliable writes.
1601          */
1602         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1603             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1604              do_data_tag)) {
1605                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1606                 brq->sbc.arg = brq->data.blocks |
1607                         (do_rel_wr ? (1 << 31) : 0) |
1608                         (do_data_tag ? (1 << 29) : 0);
1609                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1610                 brq->mrq.sbc = &brq->sbc;
1611         }
1612
1613         mmc_set_data_timeout(&brq->data, card);
1614
1615         brq->data.sg = mqrq->sg;
1616         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1617
1618         /*
1619          * Adjust the sg list so it is the same size as the
1620          * request.
1621          */
1622         if (brq->data.blocks != blk_rq_sectors(req)) {
1623                 int i, data_size = brq->data.blocks << 9;
1624                 struct scatterlist *sg;
1625
1626                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1627                         data_size -= sg->length;
1628                         if (data_size <= 0) {
1629                                 sg->length += data_size;
1630                                 i++;
1631                                 break;
1632                         }
1633                 }
1634                 brq->data.sg_len = i;
1635         }
1636
1637         mqrq->mmc_active.mrq = &brq->mrq;
1638         mqrq->mmc_active.err_check = mmc_blk_err_check;
1639
1640         mmc_queue_bounce_pre(mqrq);
1641 }
1642
1643 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1644                                           struct mmc_card *card)
1645 {
1646         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1647         unsigned int max_seg_sz = queue_max_segment_size(q);
1648         unsigned int len, nr_segs = 0;
1649
1650         do {
1651                 len = min(hdr_sz, max_seg_sz);
1652                 hdr_sz -= len;
1653                 nr_segs++;
1654         } while (hdr_sz);
1655
1656         return nr_segs;
1657 }
1658
1659 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1660 {
1661         struct request_queue *q = mq->queue;
1662         struct mmc_card *card = mq->card;
1663         struct request *cur = req, *next = NULL;
1664         struct mmc_blk_data *md = mq->data;
1665         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1666         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1667         unsigned int req_sectors = 0, phys_segments = 0;
1668         unsigned int max_blk_count, max_phys_segs;
1669         bool put_back = true;
1670         u8 max_packed_rw = 0;
1671         u8 reqs = 0;
1672
1673         /*
1674          * We don't need to check packed for any further
1675          * operation of packed stuff as we set MMC_PACKED_NONE
1676          * and return zero for reqs if geting null packed. Also
1677          * we clean the flag of MMC_BLK_PACKED_CMD to avoid doing
1678          * it again when removing blk req.
1679          */
1680         if (!mqrq->packed) {
1681                 md->flags &= (~MMC_BLK_PACKED_CMD);
1682                 goto no_packed;
1683         }
1684
1685         if (!(md->flags & MMC_BLK_PACKED_CMD))
1686                 goto no_packed;
1687
1688         if ((rq_data_dir(cur) == WRITE) &&
1689             mmc_host_packed_wr(card->host))
1690                 max_packed_rw = card->ext_csd.max_packed_writes;
1691
1692         if (max_packed_rw == 0)
1693                 goto no_packed;
1694
1695         if (mmc_req_rel_wr(cur) &&
1696             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1697                 goto no_packed;
1698
1699         if (mmc_large_sector(card) &&
1700             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1701                 goto no_packed;
1702
1703         mmc_blk_clear_packed(mqrq);
1704
1705         max_blk_count = min(card->host->max_blk_count,
1706                             card->host->max_req_size >> 9);
1707         if (unlikely(max_blk_count > 0xffff))
1708                 max_blk_count = 0xffff;
1709
1710         max_phys_segs = queue_max_segments(q);
1711         req_sectors += blk_rq_sectors(cur);
1712         phys_segments += cur->nr_phys_segments;
1713
1714         if (rq_data_dir(cur) == WRITE) {
1715                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1716                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1717         }
1718
1719         do {
1720                 if (reqs >= max_packed_rw - 1) {
1721                         put_back = false;
1722                         break;
1723                 }
1724
1725                 spin_lock_irq(q->queue_lock);
1726                 next = blk_fetch_request(q);
1727                 spin_unlock_irq(q->queue_lock);
1728                 if (!next) {
1729                         put_back = false;
1730                         break;
1731                 }
1732
1733                 if (mmc_large_sector(card) &&
1734                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1735                         break;
1736
1737                 if (req_op(next) == REQ_OP_DISCARD ||
1738                     req_op(next) == REQ_OP_SECURE_ERASE ||
1739                     req_op(next) == REQ_OP_FLUSH)
1740                         break;
1741
1742                 if (rq_data_dir(cur) != rq_data_dir(next))
1743                         break;
1744
1745                 if (mmc_req_rel_wr(next) &&
1746                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1747                         break;
1748
1749                 req_sectors += blk_rq_sectors(next);
1750                 if (req_sectors > max_blk_count)
1751                         break;
1752
1753                 phys_segments +=  next->nr_phys_segments;
1754                 if (phys_segments > max_phys_segs)
1755                         break;
1756
1757                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1758                 cur = next;
1759                 reqs++;
1760         } while (1);
1761
1762         if (put_back) {
1763                 spin_lock_irq(q->queue_lock);
1764                 blk_requeue_request(q, next);
1765                 spin_unlock_irq(q->queue_lock);
1766         }
1767
1768         if (reqs > 0) {
1769                 list_add(&req->queuelist, &mqrq->packed->list);
1770                 mqrq->packed->nr_entries = ++reqs;
1771                 mqrq->packed->retries = reqs;
1772                 return reqs;
1773         }
1774
1775 no_packed:
1776         mqrq->cmd_type = MMC_PACKED_NONE;
1777         return 0;
1778 }
1779
1780 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1781                                         struct mmc_card *card,
1782                                         struct mmc_queue *mq)
1783 {
1784         struct mmc_blk_request *brq = &mqrq->brq;
1785         struct request *req = mqrq->req;
1786         struct request *prq;
1787         struct mmc_blk_data *md = mq->data;
1788         struct mmc_packed *packed = mqrq->packed;
1789         bool do_rel_wr, do_data_tag;
1790         __le32 *packed_cmd_hdr;
1791         u8 hdr_blocks;
1792         u8 i = 1;
1793
1794         mqrq->cmd_type = MMC_PACKED_WRITE;
1795         packed->blocks = 0;
1796         packed->idx_failure = MMC_PACKED_NR_IDX;
1797
1798         packed_cmd_hdr = packed->cmd_hdr;
1799         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1800         packed_cmd_hdr[0] = cpu_to_le32((packed->nr_entries << 16) |
1801                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER);
1802         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1803
1804         /*
1805          * Argument for each entry of packed group
1806          */
1807         list_for_each_entry(prq, &packed->list, queuelist) {
1808                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1809                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1810                         (prq->cmd_flags & REQ_META) &&
1811                         (rq_data_dir(prq) == WRITE) &&
1812                         blk_rq_bytes(prq) >= card->ext_csd.data_tag_unit_size;
1813                 /* Argument of CMD23 */
1814                 packed_cmd_hdr[(i * 2)] = cpu_to_le32(
1815                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1816                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1817                         blk_rq_sectors(prq));
1818                 /* Argument of CMD18 or CMD25 */
1819                 packed_cmd_hdr[((i * 2)) + 1] = cpu_to_le32(
1820                         mmc_card_blockaddr(card) ?
1821                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9);
1822                 packed->blocks += blk_rq_sectors(prq);
1823                 i++;
1824         }
1825
1826         memset(brq, 0, sizeof(struct mmc_blk_request));
1827         brq->mrq.cmd = &brq->cmd;
1828         brq->mrq.data = &brq->data;
1829         brq->mrq.sbc = &brq->sbc;
1830         brq->mrq.stop = &brq->stop;
1831
1832         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1833         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1834         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1835
1836         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1837         brq->cmd.arg = blk_rq_pos(req);
1838         if (!mmc_card_blockaddr(card))
1839                 brq->cmd.arg <<= 9;
1840         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1841
1842         brq->data.blksz = 512;
1843         brq->data.blocks = packed->blocks + hdr_blocks;
1844         brq->data.flags = MMC_DATA_WRITE;
1845
1846         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1847         brq->stop.arg = 0;
1848         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1849
1850         mmc_set_data_timeout(&brq->data, card);
1851
1852         brq->data.sg = mqrq->sg;
1853         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1854
1855         mqrq->mmc_active.mrq = &brq->mrq;
1856         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1857
1858         mmc_queue_bounce_pre(mqrq);
1859 }
1860
1861 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1862                            struct mmc_blk_request *brq, struct request *req,
1863                            int ret)
1864 {
1865         struct mmc_queue_req *mq_rq;
1866         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1867
1868         /*
1869          * If this is an SD card and we're writing, we can first
1870          * mark the known good sectors as ok.
1871          *
1872          * If the card is not SD, we can still ok written sectors
1873          * as reported by the controller (which might be less than
1874          * the real number of written sectors, but never more).
1875          */
1876         if (mmc_card_sd(card)) {
1877                 u32 blocks;
1878
1879                 blocks = mmc_sd_num_wr_blocks(card);
1880                 if (blocks != (u32)-1) {
1881                         ret = blk_end_request(req, 0, blocks << 9);
1882                 }
1883         } else {
1884                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1885                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1886         }
1887         return ret;
1888 }
1889
1890 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1891 {
1892         struct request *prq;
1893         struct mmc_packed *packed = mq_rq->packed;
1894         int idx = packed->idx_failure, i = 0;
1895         int ret = 0;
1896
1897         while (!list_empty(&packed->list)) {
1898                 prq = list_entry_rq(packed->list.next);
1899                 if (idx == i) {
1900                         /* retry from error index */
1901                         packed->nr_entries -= idx;
1902                         mq_rq->req = prq;
1903                         ret = 1;
1904
1905                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1906                                 list_del_init(&prq->queuelist);
1907                                 mmc_blk_clear_packed(mq_rq);
1908                         }
1909                         return ret;
1910                 }
1911                 list_del_init(&prq->queuelist);
1912                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1913                 i++;
1914         }
1915
1916         mmc_blk_clear_packed(mq_rq);
1917         return ret;
1918 }
1919
1920 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1921 {
1922         struct request *prq;
1923         struct mmc_packed *packed = mq_rq->packed;
1924
1925         while (!list_empty(&packed->list)) {
1926                 prq = list_entry_rq(packed->list.next);
1927                 list_del_init(&prq->queuelist);
1928                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1929         }
1930
1931         mmc_blk_clear_packed(mq_rq);
1932 }
1933
1934 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1935                                       struct mmc_queue_req *mq_rq)
1936 {
1937         struct request *prq;
1938         struct request_queue *q = mq->queue;
1939         struct mmc_packed *packed = mq_rq->packed;
1940
1941         while (!list_empty(&packed->list)) {
1942                 prq = list_entry_rq(packed->list.prev);
1943                 if (prq->queuelist.prev != &packed->list) {
1944                         list_del_init(&prq->queuelist);
1945                         spin_lock_irq(q->queue_lock);
1946                         blk_requeue_request(mq->queue, prq);
1947                         spin_unlock_irq(q->queue_lock);
1948                 } else {
1949                         list_del_init(&prq->queuelist);
1950                 }
1951         }
1952
1953         mmc_blk_clear_packed(mq_rq);
1954 }
1955
1956 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1957 {
1958         struct mmc_blk_data *md = mq->data;
1959         struct mmc_card *card = md->queue.card;
1960         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1961         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1962         enum mmc_blk_status status;
1963         struct mmc_queue_req *mq_rq;
1964         struct request *req = rqc;
1965         struct mmc_async_req *areq;
1966         const u8 packed_nr = 2;
1967         u8 reqs = 0;
1968
1969         if (!rqc && !mq->mqrq_prev->req)
1970                 return 0;
1971
1972         if (rqc)
1973                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1974
1975         do {
1976                 if (rqc) {
1977                         /*
1978                          * When 4KB native sector is enabled, only 8 blocks
1979                          * multiple read or write is allowed
1980                          */
1981                         if (mmc_large_sector(card) &&
1982                                 !IS_ALIGNED(blk_rq_sectors(rqc), 8)) {
1983                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1984                                         req->rq_disk->disk_name);
1985                                 mq_rq = mq->mqrq_cur;
1986                                 goto cmd_abort;
1987                         }
1988
1989                         if (reqs >= packed_nr)
1990                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1991                                                             card, mq);
1992                         else
1993                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1994                         areq = &mq->mqrq_cur->mmc_active;
1995                 } else
1996                         areq = NULL;
1997                 areq = mmc_start_req(card->host, areq, (int *) &status);
1998                 if (!areq) {
1999                         if (status == MMC_BLK_NEW_REQUEST)
2000                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
2001                         return 0;
2002                 }
2003
2004                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
2005                 brq = &mq_rq->brq;
2006                 req = mq_rq->req;
2007                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
2008                 mmc_queue_bounce_post(mq_rq);
2009
2010                 switch (status) {
2011                 case MMC_BLK_SUCCESS:
2012                 case MMC_BLK_PARTIAL:
2013                         /*
2014                          * A block was successfully transferred.
2015                          */
2016                         mmc_blk_reset_success(md, type);
2017
2018                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2019                                 ret = mmc_blk_end_packed_req(mq_rq);
2020                                 break;
2021                         } else {
2022                                 ret = blk_end_request(req, 0,
2023                                                 brq->data.bytes_xfered);
2024                         }
2025
2026                         /*
2027                          * If the blk_end_request function returns non-zero even
2028                          * though all data has been transferred and no errors
2029                          * were returned by the host controller, it's a bug.
2030                          */
2031                         if (status == MMC_BLK_SUCCESS && ret) {
2032                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2033                                        __func__, blk_rq_bytes(req),
2034                                        brq->data.bytes_xfered);
2035                                 rqc = NULL;
2036                                 goto cmd_abort;
2037                         }
2038                         break;
2039                 case MMC_BLK_CMD_ERR:
2040                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2041                         if (mmc_blk_reset(md, card->host, type))
2042                                 goto cmd_abort;
2043                         if (!ret)
2044                                 goto start_new_req;
2045                         break;
2046                 case MMC_BLK_RETRY:
2047                         retune_retry_done = brq->retune_retry_done;
2048                         if (retry++ < 5)
2049                                 break;
2050                         /* Fall through */
2051                 case MMC_BLK_ABORT:
2052                         if (!mmc_blk_reset(md, card->host, type))
2053                                 break;
2054                         goto cmd_abort;
2055                 case MMC_BLK_DATA_ERR: {
2056                         int err;
2057
2058                         err = mmc_blk_reset(md, card->host, type);
2059                         if (!err)
2060                                 break;
2061                         if (err == -ENODEV ||
2062                                 mmc_packed_cmd(mq_rq->cmd_type))
2063                                 goto cmd_abort;
2064                         /* Fall through */
2065                 }
2066                 case MMC_BLK_ECC_ERR:
2067                         if (brq->data.blocks > 1) {
2068                                 /* Redo read one sector at a time */
2069                                 pr_warn("%s: retrying using single block read\n",
2070                                         req->rq_disk->disk_name);
2071                                 disable_multi = 1;
2072                                 break;
2073                         }
2074                         /*
2075                          * After an error, we redo I/O one sector at a
2076                          * time, so we only reach here after trying to
2077                          * read a single sector.
2078                          */
2079                         ret = blk_end_request(req, -EIO,
2080                                                 brq->data.blksz);
2081                         if (!ret)
2082                                 goto start_new_req;
2083                         break;
2084                 case MMC_BLK_NOMEDIUM:
2085                         goto cmd_abort;
2086                 default:
2087                         pr_err("%s: Unhandled return value (%d)",
2088                                         req->rq_disk->disk_name, status);
2089                         goto cmd_abort;
2090                 }
2091
2092                 if (ret) {
2093                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2094                                 if (!mq_rq->packed->retries)
2095                                         goto cmd_abort;
2096                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2097                                 mmc_start_req(card->host,
2098                                               &mq_rq->mmc_active, NULL);
2099                         } else {
2100
2101                                 /*
2102                                  * In case of a incomplete request
2103                                  * prepare it again and resend.
2104                                  */
2105                                 mmc_blk_rw_rq_prep(mq_rq, card,
2106                                                 disable_multi, mq);
2107                                 mmc_start_req(card->host,
2108                                                 &mq_rq->mmc_active, NULL);
2109                         }
2110                         mq_rq->brq.retune_retry_done = retune_retry_done;
2111                 }
2112         } while (ret);
2113
2114         return 1;
2115
2116  cmd_abort:
2117         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2118                 mmc_blk_abort_packed_req(mq_rq);
2119         } else {
2120                 if (mmc_card_removed(card))
2121                         req->cmd_flags |= REQ_QUIET;
2122                 while (ret)
2123                         ret = blk_end_request(req, -EIO,
2124                                         blk_rq_cur_bytes(req));
2125         }
2126
2127  start_new_req:
2128         if (rqc) {
2129                 if (mmc_card_removed(card)) {
2130                         rqc->cmd_flags |= REQ_QUIET;
2131                         blk_end_request_all(rqc, -EIO);
2132                 } else {
2133                         /*
2134                          * If current request is packed, it needs to put back.
2135                          */
2136                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2137                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2138
2139                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2140                         mmc_start_req(card->host,
2141                                       &mq->mqrq_cur->mmc_active, NULL);
2142                 }
2143         }
2144
2145         return 0;
2146 }
2147
2148 int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2149 {
2150         int ret;
2151         struct mmc_blk_data *md = mq->data;
2152         struct mmc_card *card = md->queue.card;
2153         struct mmc_host *host = card->host;
2154         unsigned long flags;
2155         bool req_is_special = mmc_req_is_special(req);
2156
2157         if (req && !mq->mqrq_prev->req)
2158                 /* claim host only for the first request */
2159                 mmc_get_card(card);
2160
2161         ret = mmc_blk_part_switch(card, md);
2162         if (ret) {
2163                 if (req) {
2164                         blk_end_request_all(req, -EIO);
2165                 }
2166                 ret = 0;
2167                 goto out;
2168         }
2169
2170         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2171         if (req && req_op(req) == REQ_OP_DISCARD) {
2172                 /* complete ongoing async transfer before issuing discard */
2173                 if (card->host->areq)
2174                         mmc_blk_issue_rw_rq(mq, NULL);
2175                 ret = mmc_blk_issue_discard_rq(mq, req);
2176         } else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {
2177                 /* complete ongoing async transfer before issuing secure erase*/
2178                 if (card->host->areq)
2179                         mmc_blk_issue_rw_rq(mq, NULL);
2180                 ret = mmc_blk_issue_secdiscard_rq(mq, req);
2181         } else if (req && req_op(req) == REQ_OP_FLUSH) {
2182                 /* complete ongoing async transfer before issuing flush */
2183                 if (card->host->areq)
2184                         mmc_blk_issue_rw_rq(mq, NULL);
2185                 ret = mmc_blk_issue_flush(mq, req);
2186         } else {
2187                 if (!req && host->areq) {
2188                         spin_lock_irqsave(&host->context_info.lock, flags);
2189                         host->context_info.is_waiting_last_req = true;
2190                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2191                 }
2192                 ret = mmc_blk_issue_rw_rq(mq, req);
2193         }
2194
2195 out:
2196         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) || req_is_special)
2197                 /*
2198                  * Release host when there are no more requests
2199                  * and after special request(discard, flush) is done.
2200                  * In case sepecial request, there is no reentry to
2201                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2202                  */
2203                 mmc_put_card(card);
2204         return ret;
2205 }
2206
2207 static inline int mmc_blk_readonly(struct mmc_card *card)
2208 {
2209         return mmc_card_readonly(card) ||
2210                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2211 }
2212
2213 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2214                                               struct device *parent,
2215                                               sector_t size,
2216                                               bool default_ro,
2217                                               const char *subname,
2218                                               int area_type)
2219 {
2220         struct mmc_blk_data *md;
2221         int devidx, ret;
2222
2223 again:
2224         if (!ida_pre_get(&mmc_blk_ida, GFP_KERNEL))
2225                 return ERR_PTR(-ENOMEM);
2226
2227         spin_lock(&mmc_blk_lock);
2228         ret = ida_get_new(&mmc_blk_ida, &devidx);
2229         spin_unlock(&mmc_blk_lock);
2230
2231         if (ret == -EAGAIN)
2232                 goto again;
2233         else if (ret)
2234                 return ERR_PTR(ret);
2235
2236         if (devidx >= max_devices) {
2237                 ret = -ENOSPC;
2238                 goto out;
2239         }
2240
2241         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2242         if (!md) {
2243                 ret = -ENOMEM;
2244                 goto out;
2245         }
2246
2247         md->area_type = area_type;
2248
2249         /*
2250          * Set the read-only status based on the supported commands
2251          * and the write protect switch.
2252          */
2253         md->read_only = mmc_blk_readonly(card);
2254
2255         md->disk = alloc_disk(perdev_minors);
2256         if (md->disk == NULL) {
2257                 ret = -ENOMEM;
2258                 goto err_kfree;
2259         }
2260
2261         spin_lock_init(&md->lock);
2262         INIT_LIST_HEAD(&md->part);
2263         md->usage = 1;
2264
2265         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2266         if (ret)
2267                 goto err_putdisk;
2268
2269         md->queue.data = md;
2270
2271         md->disk->major = MMC_BLOCK_MAJOR;
2272         md->disk->first_minor = devidx * perdev_minors;
2273         md->disk->fops = &mmc_bdops;
2274         md->disk->private_data = md;
2275         md->disk->queue = md->queue.queue;
2276         md->parent = parent;
2277         set_disk_ro(md->disk, md->read_only || default_ro);
2278         md->disk->flags = GENHD_FL_EXT_DEVT;
2279         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2280                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2281
2282         /*
2283          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2284          *
2285          * - be set for removable media with permanent block devices
2286          * - be unset for removable block devices with permanent media
2287          *
2288          * Since MMC block devices clearly fall under the second
2289          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2290          * should use the block device creation/destruction hotplug
2291          * messages to tell when the card is present.
2292          */
2293
2294         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2295                  "mmcblk%u%s", card->host->index, subname ? subname : "");
2296
2297         if (mmc_card_mmc(card))
2298                 blk_queue_logical_block_size(md->queue.queue,
2299                                              card->ext_csd.data_sector_size);
2300         else
2301                 blk_queue_logical_block_size(md->queue.queue, 512);
2302
2303         set_capacity(md->disk, size);
2304
2305         if (mmc_host_cmd23(card->host)) {
2306                 if ((mmc_card_mmc(card) &&
2307                      card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2308                     (mmc_card_sd(card) &&
2309                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2310                         md->flags |= MMC_BLK_CMD23;
2311         }
2312
2313         if (mmc_card_mmc(card) &&
2314             md->flags & MMC_BLK_CMD23 &&
2315             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2316              card->ext_csd.rel_sectors)) {
2317                 md->flags |= MMC_BLK_REL_WR;
2318                 blk_queue_write_cache(md->queue.queue, true, true);
2319         }
2320
2321         if (mmc_card_mmc(card) &&
2322             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2323             (md->flags & MMC_BLK_CMD23) &&
2324             card->ext_csd.packed_event_en) {
2325                 if (!mmc_packed_init(&md->queue, card))
2326                         md->flags |= MMC_BLK_PACKED_CMD;
2327         }
2328
2329         return md;
2330
2331  err_putdisk:
2332         put_disk(md->disk);
2333  err_kfree:
2334         kfree(md);
2335  out:
2336         spin_lock(&mmc_blk_lock);
2337         ida_remove(&mmc_blk_ida, devidx);
2338         spin_unlock(&mmc_blk_lock);
2339         return ERR_PTR(ret);
2340 }
2341
2342 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2343 {
2344         sector_t size;
2345
2346         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2347                 /*
2348                  * The EXT_CSD sector count is in number or 512 byte
2349                  * sectors.
2350                  */
2351                 size = card->ext_csd.sectors;
2352         } else {
2353                 /*
2354                  * The CSD capacity field is in units of read_blkbits.
2355                  * set_capacity takes units of 512 bytes.
2356                  */
2357                 size = (typeof(sector_t))card->csd.capacity
2358                         << (card->csd.read_blkbits - 9);
2359         }
2360
2361         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2362                                         MMC_BLK_DATA_AREA_MAIN);
2363 }
2364
2365 static int mmc_blk_alloc_part(struct mmc_card *card,
2366                               struct mmc_blk_data *md,
2367                               unsigned int part_type,
2368                               sector_t size,
2369                               bool default_ro,
2370                               const char *subname,
2371                               int area_type)
2372 {
2373         char cap_str[10];
2374         struct mmc_blk_data *part_md;
2375
2376         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2377                                     subname, area_type);
2378         if (IS_ERR(part_md))
2379                 return PTR_ERR(part_md);
2380         part_md->part_type = part_type;
2381         list_add(&part_md->part, &md->part);
2382
2383         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2384                         cap_str, sizeof(cap_str));
2385         pr_info("%s: %s %s partition %u %s\n",
2386                part_md->disk->disk_name, mmc_card_id(card),
2387                mmc_card_name(card), part_md->part_type, cap_str);
2388         return 0;
2389 }
2390
2391 /* MMC Physical partitions consist of two boot partitions and
2392  * up to four general purpose partitions.
2393  * For each partition enabled in EXT_CSD a block device will be allocatedi
2394  * to provide access to the partition.
2395  */
2396
2397 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2398 {
2399         int idx, ret = 0;
2400
2401         if (!mmc_card_mmc(card))
2402                 return 0;
2403
2404         for (idx = 0; idx < card->nr_parts; idx++) {
2405                 if (card->part[idx].size) {
2406                         ret = mmc_blk_alloc_part(card, md,
2407                                 card->part[idx].part_cfg,
2408                                 card->part[idx].size >> 9,
2409                                 card->part[idx].force_ro,
2410                                 card->part[idx].name,
2411                                 card->part[idx].area_type);
2412                         if (ret)
2413                                 return ret;
2414                 }
2415         }
2416
2417         return ret;
2418 }
2419
2420 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2421 {
2422         struct mmc_card *card;
2423
2424         if (md) {
2425                 /*
2426                  * Flush remaining requests and free queues. It
2427                  * is freeing the queue that stops new requests
2428                  * from being accepted.
2429                  */
2430                 card = md->queue.card;
2431                 mmc_cleanup_queue(&md->queue);
2432                 if (md->flags & MMC_BLK_PACKED_CMD)
2433                         mmc_packed_clean(&md->queue);
2434                 if (md->disk->flags & GENHD_FL_UP) {
2435                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2436                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2437                                         card->ext_csd.boot_ro_lockable)
2438                                 device_remove_file(disk_to_dev(md->disk),
2439                                         &md->power_ro_lock);
2440
2441                         del_gendisk(md->disk);
2442                 }
2443                 mmc_blk_put(md);
2444         }
2445 }
2446
2447 static void mmc_blk_remove_parts(struct mmc_card *card,
2448                                  struct mmc_blk_data *md)
2449 {
2450         struct list_head *pos, *q;
2451         struct mmc_blk_data *part_md;
2452
2453         list_for_each_safe(pos, q, &md->part) {
2454                 part_md = list_entry(pos, struct mmc_blk_data, part);
2455                 list_del(pos);
2456                 mmc_blk_remove_req(part_md);
2457         }
2458 }
2459
2460 static int mmc_add_disk(struct mmc_blk_data *md)
2461 {
2462         int ret;
2463         struct mmc_card *card = md->queue.card;
2464
2465         device_add_disk(md->parent, md->disk);
2466         md->force_ro.show = force_ro_show;
2467         md->force_ro.store = force_ro_store;
2468         sysfs_attr_init(&md->force_ro.attr);
2469         md->force_ro.attr.name = "force_ro";
2470         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2471         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2472         if (ret)
2473                 goto force_ro_fail;
2474
2475         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2476              card->ext_csd.boot_ro_lockable) {
2477                 umode_t mode;
2478
2479                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2480                         mode = S_IRUGO;
2481                 else
2482                         mode = S_IRUGO | S_IWUSR;
2483
2484                 md->power_ro_lock.show = power_ro_lock_show;
2485                 md->power_ro_lock.store = power_ro_lock_store;
2486                 sysfs_attr_init(&md->power_ro_lock.attr);
2487                 md->power_ro_lock.attr.mode = mode;
2488                 md->power_ro_lock.attr.name =
2489                                         "ro_lock_until_next_power_on";
2490                 ret = device_create_file(disk_to_dev(md->disk),
2491                                 &md->power_ro_lock);
2492                 if (ret)
2493                         goto power_ro_lock_fail;
2494         }
2495         return ret;
2496
2497 power_ro_lock_fail:
2498         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2499 force_ro_fail:
2500         del_gendisk(md->disk);
2501
2502         return ret;
2503 }
2504
2505 static const struct mmc_fixup blk_fixups[] =
2506 {
2507         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2508                   MMC_QUIRK_INAND_CMD38),
2509         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2510                   MMC_QUIRK_INAND_CMD38),
2511         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2512                   MMC_QUIRK_INAND_CMD38),
2513         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2514                   MMC_QUIRK_INAND_CMD38),
2515         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2516                   MMC_QUIRK_INAND_CMD38),
2517
2518         /*
2519          * Some MMC cards experience performance degradation with CMD23
2520          * instead of CMD12-bounded multiblock transfers. For now we'll
2521          * black list what's bad...
2522          * - Certain Toshiba cards.
2523          *
2524          * N.B. This doesn't affect SD cards.
2525          */
2526         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2527                   MMC_QUIRK_BLK_NO_CMD23),
2528         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2529                   MMC_QUIRK_BLK_NO_CMD23),
2530         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2531                   MMC_QUIRK_BLK_NO_CMD23),
2532         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2533                   MMC_QUIRK_BLK_NO_CMD23),
2534         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2535                   MMC_QUIRK_BLK_NO_CMD23),
2536
2537         /*
2538          * Some MMC cards need longer data read timeout than indicated in CSD.
2539          */
2540         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2541                   MMC_QUIRK_LONG_READ_TIME),
2542         MMC_FIXUP("008GE0", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2543                   MMC_QUIRK_LONG_READ_TIME),
2544
2545         /*
2546          * On these Samsung MoviNAND parts, performing secure erase or
2547          * secure trim can result in unrecoverable corruption due to a
2548          * firmware bug.
2549          */
2550         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2551                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2552         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2553                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2554         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2555                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2556         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2557                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2558         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2559                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2560         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2561                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2562         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2563                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2564         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2565                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2566
2567         /*
2568          *  On Some Kingston eMMCs, performing trim can result in
2569          *  unrecoverable data conrruption occasionally due to a firmware bug.
2570          */
2571         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2572                   MMC_QUIRK_TRIM_BROKEN),
2573         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2574                   MMC_QUIRK_TRIM_BROKEN),
2575
2576         END_FIXUP
2577 };
2578
2579 static int mmc_blk_probe(struct mmc_card *card)
2580 {
2581         struct mmc_blk_data *md, *part_md;
2582         char cap_str[10];
2583
2584         /*
2585          * Check that the card supports the command class(es) we need.
2586          */
2587         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2588                 return -ENODEV;
2589
2590         mmc_fixup_device(card, blk_fixups);
2591
2592         md = mmc_blk_alloc(card);
2593         if (IS_ERR(md))
2594                 return PTR_ERR(md);
2595
2596         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2597                         cap_str, sizeof(cap_str));
2598         pr_info("%s: %s %s %s %s\n",
2599                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2600                 cap_str, md->read_only ? "(ro)" : "");
2601
2602         if (mmc_blk_alloc_parts(card, md))
2603                 goto out;
2604
2605         dev_set_drvdata(&card->dev, md);
2606
2607         if (mmc_add_disk(md))
2608                 goto out;
2609
2610         list_for_each_entry(part_md, &md->part, part) {
2611                 if (mmc_add_disk(part_md))
2612                         goto out;
2613         }
2614
2615         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2616         pm_runtime_use_autosuspend(&card->dev);
2617
2618         /*
2619          * Don't enable runtime PM for SD-combo cards here. Leave that
2620          * decision to be taken during the SDIO init sequence instead.
2621          */
2622         if (card->type != MMC_TYPE_SD_COMBO) {
2623                 pm_runtime_set_active(&card->dev);
2624                 pm_runtime_enable(&card->dev);
2625         }
2626
2627         return 0;
2628
2629  out:
2630         mmc_blk_remove_parts(card, md);
2631         mmc_blk_remove_req(md);
2632         return 0;
2633 }
2634
2635 static void mmc_blk_remove(struct mmc_card *card)
2636 {
2637         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2638
2639         mmc_blk_remove_parts(card, md);
2640         pm_runtime_get_sync(&card->dev);
2641         mmc_claim_host(card->host);
2642         mmc_blk_part_switch(card, md);
2643         mmc_release_host(card->host);
2644         if (card->type != MMC_TYPE_SD_COMBO)
2645                 pm_runtime_disable(&card->dev);
2646         pm_runtime_put_noidle(&card->dev);
2647         mmc_blk_remove_req(md);
2648         dev_set_drvdata(&card->dev, NULL);
2649 }
2650
2651 static int _mmc_blk_suspend(struct mmc_card *card)
2652 {
2653         struct mmc_blk_data *part_md;
2654         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2655
2656         if (md) {
2657                 mmc_queue_suspend(&md->queue);
2658                 list_for_each_entry(part_md, &md->part, part) {
2659                         mmc_queue_suspend(&part_md->queue);
2660                 }
2661         }
2662         return 0;
2663 }
2664
2665 static void mmc_blk_shutdown(struct mmc_card *card)
2666 {
2667         _mmc_blk_suspend(card);
2668 }
2669
2670 #ifdef CONFIG_PM_SLEEP
2671 static int mmc_blk_suspend(struct device *dev)
2672 {
2673         struct mmc_card *card = mmc_dev_to_card(dev);
2674
2675         return _mmc_blk_suspend(card);
2676 }
2677
2678 static int mmc_blk_resume(struct device *dev)
2679 {
2680         struct mmc_blk_data *part_md;
2681         struct mmc_blk_data *md = dev_get_drvdata(dev);
2682
2683         if (md) {
2684                 /*
2685                  * Resume involves the card going into idle state,
2686                  * so current partition is always the main one.
2687                  */
2688                 md->part_curr = md->part_type;
2689                 mmc_queue_resume(&md->queue);
2690                 list_for_each_entry(part_md, &md->part, part) {
2691                         mmc_queue_resume(&part_md->queue);
2692                 }
2693         }
2694         return 0;
2695 }
2696 #endif
2697
2698 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2699
2700 static struct mmc_driver mmc_driver = {
2701         .drv            = {
2702                 .name   = "mmcblk",
2703                 .pm     = &mmc_blk_pm_ops,
2704         },
2705         .probe          = mmc_blk_probe,
2706         .remove         = mmc_blk_remove,
2707         .shutdown       = mmc_blk_shutdown,
2708 };
2709
2710 static int __init mmc_blk_init(void)
2711 {
2712         int res;
2713
2714         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2715                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2716
2717         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2718
2719         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2720         if (res)
2721                 goto out;
2722
2723         res = mmc_register_driver(&mmc_driver);
2724         if (res)
2725                 goto out2;
2726
2727         return 0;
2728  out2:
2729         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2730  out:
2731         return res;
2732 }
2733
2734 static void __exit mmc_blk_exit(void)
2735 {
2736         mmc_unregister_driver(&mmc_driver);
2737         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2738 }
2739
2740 module_init(mmc_blk_init);
2741 module_exit(mmc_blk_exit);
2742
2743 MODULE_LICENSE("GPL");
2744 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2745