drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <trace/events/mmc.h>
  40
  41 #include <linux/mmc/ioctl.h>
  42 #include <linux/mmc/card.h>
  43 #include <linux/mmc/host.h>
  44 #include <linux/mmc/mmc.h>
  45 #include <linux/mmc/sd.h>
  46
  47 #include <asm/uaccess.h>
  48
  49 #include "queue.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  * currently limited by the size of the static bitmaps below.
  84  */
  85 static int max_devices;
  86
  87 #define MAX_DEVICES 256
  88
  89 /* TODO: Replace these with struct ida */
  90 static DECLARE_BITMAP(dev_use, MAX_DEVICES);
  91 static DECLARE_BITMAP(name_use, MAX_DEVICES);
  92
  93 /*
  94  * There is one mmc_blk_data per slot.
  95  */
  96 struct mmc_blk_data {
  97         spinlock_t      lock;
  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    name_idx;
 111         unsigned int    reset_done;
 112 #define MMC_BLK_READ            BIT(0)
 113 #define MMC_BLK_WRITE           BIT(1)
 114 #define MMC_BLK_DISCARD         BIT(2)
 115 #define MMC_BLK_SECDISCARD      BIT(3)
 116
 117         /*
 118          * Only set in main mmc_blk_data associated
 119          * with mmc_card with dev_set_drvdata, and keeps
 120          * track of the current selected device partition.
 121          */
 122         unsigned int    part_curr;
 123         struct device_attribute force_ro;
 124         struct device_attribute power_ro_lock;
 125         int     area_type;
 126 };
 127
 128 static DEFINE_MUTEX(open_lock);
 129
 130 enum {
 131         MMC_PACKED_NR_IDX = -1,
 132         MMC_PACKED_NR_ZERO,
 133         MMC_PACKED_NR_SINGLE,
 134 };
 135
 136 module_param(perdev_minors, int, 0444);
 137 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 138
 139 static inline int mmc_blk_part_switch(struct mmc_card *card,
 140                                       struct mmc_blk_data *md);
 141 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 142
 143 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 144 {
 145         struct mmc_packed *packed = mqrq->packed;
 146
 147         BUG_ON(!packed);
 148
 149         mqrq->cmd_type = MMC_PACKED_NONE;
 150         packed->nr_entries = MMC_PACKED_NR_ZERO;
 151         packed->idx_failure = MMC_PACKED_NR_IDX;
 152         packed->retries = 0;
 153         packed->blocks = 0;
 154 }
 155
 156 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 157 {
 158         struct mmc_blk_data *md;
 159
 160         mutex_lock(&open_lock);
 161         md = disk->private_data;
 162         if (md && md->usage == 0)
 163                 md = NULL;
 164         if (md)
 165                 md->usage++;
 166         mutex_unlock(&open_lock);
 167
 168         return md;
 169 }
 170
 171 static inline int mmc_get_devidx(struct gendisk *disk)
 172 {
 173         int devidx = disk->first_minor / perdev_minors;
 174         return devidx;
 175 }
 176
 177 static void mmc_blk_put(struct mmc_blk_data *md)
 178 {
 179         mutex_lock(&open_lock);
 180         md->usage--;
 181         if (md->usage == 0) {
 182                 int devidx = mmc_get_devidx(md->disk);
 183                 blk_cleanup_queue(md->queue.queue);
 184
 185                 __clear_bit(devidx, dev_use);
 186
 187                 put_disk(md->disk);
 188                 kfree(md);
 189         }
 190         mutex_unlock(&open_lock);
 191 }
 192
 193 static ssize_t power_ro_lock_show(struct device *dev,
 194                 struct device_attribute *attr, char *buf)
 195 {
 196         int ret;
 197         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 198         struct mmc_card *card = md->queue.card;
 199         int locked = 0;
 200
 201         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 202                 locked = 2;
 203         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 204                 locked = 1;
 205
 206         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 207
 208         mmc_blk_put(md);
 209
 210         return ret;
 211 }
 212
 213 static ssize_t power_ro_lock_store(struct device *dev,
 214                 struct device_attribute *attr, const char *buf, size_t count)
 215 {
 216         int ret;
 217         struct mmc_blk_data *md, *part_md;
 218         struct mmc_card *card;
 219         unsigned long set;
 220
 221         if (kstrtoul(buf, 0, &set))
 222                 return -EINVAL;
 223
 224         if (set != 1)
 225                 return count;
 226
 227         md = mmc_blk_get(dev_to_disk(dev));
 228         card = md->queue.card;
 229
 230         mmc_get_card(card);
 231
 232         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 233                                 card->ext_csd.boot_ro_lock |
 234                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 235                                 card->ext_csd.part_time);
 236         if (ret)
 237                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 238         else
 239                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 240
 241         mmc_put_card(card);
 242
 243         if (!ret) {
 244                 pr_info("%s: Locking boot partition ro until next power on\n",
 245                         md->disk->disk_name);
 246                 set_disk_ro(md->disk, 1);
 247
 248                 list_for_each_entry(part_md, &md->part, part)
 249                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 250                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 251                                 set_disk_ro(part_md->disk, 1);
 252                         }
 253         }
 254
 255         mmc_blk_put(md);
 256         return count;
 257 }
 258
 259 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 260                              char *buf)
 261 {
 262         int ret;
 263         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 264
 265         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 266                        get_disk_ro(dev_to_disk(dev)) ^
 267                        md->read_only);
 268         mmc_blk_put(md);
 269         return ret;
 270 }
 271
 272 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 273                               const char *buf, size_t count)
 274 {
 275         int ret;
 276         char *end;
 277         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 278         unsigned long set = simple_strtoul(buf, &end, 0);
 279         if (end == buf) {
 280                 ret = -EINVAL;
 281                 goto out;
 282         }
 283
 284         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 285         ret = count;
 286 out:
 287         mmc_blk_put(md);
 288         return ret;
 289 }
 290
 291 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 292 {
 293         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 294         int ret = -ENXIO;
 295
 296         mutex_lock(&block_mutex);
 297         if (md) {
 298                 if (md->usage == 2)
 299                         check_disk_change(bdev);
 300                 ret = 0;
 301
 302                 if ((mode & FMODE_WRITE) && md->read_only) {
 303                         mmc_blk_put(md);
 304                         ret = -EROFS;
 305                 }
 306         }
 307         mutex_unlock(&block_mutex);
 308
 309         return ret;
 310 }
 311
 312 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 313 {
 314         struct mmc_blk_data *md = disk->private_data;
 315
 316         mutex_lock(&block_mutex);
 317         mmc_blk_put(md);
 318         mutex_unlock(&block_mutex);
 319 }
 320
 321 static int
 322 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 323 {
 324         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 325         geo->heads = 4;
 326         geo->sectors = 16;
 327         return 0;
 328 }
 329
 330 struct mmc_blk_ioc_data {
 331         struct mmc_ioc_cmd ic;
 332         unsigned char *buf;
 333         u64 buf_bytes;
 334 };
 335
 336 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 337         struct mmc_ioc_cmd __user *user)
 338 {
 339         struct mmc_blk_ioc_data *idata;
 340         int err;
 341
 342         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 343         if (!idata) {
 344                 err = -ENOMEM;
 345                 goto out;
 346         }
 347
 348         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 349                 err = -EFAULT;
 350                 goto idata_err;
 351         }
 352
 353         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 354         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 355                 err = -EOVERFLOW;
 356                 goto idata_err;
 357         }
 358
 359         if (!idata->buf_bytes)
 360                 return idata;
 361
 362         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 363         if (!idata->buf) {
 364                 err = -ENOMEM;
 365                 goto idata_err;
 366         }
 367
 368         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 369                                         idata->ic.data_ptr, idata->buf_bytes)) {
 370                 err = -EFAULT;
 371                 goto copy_err;
 372         }
 373
 374         return idata;
 375
 376 copy_err:
 377         kfree(idata->buf);
 378 idata_err:
 379         kfree(idata);
 380 out:
 381         return ERR_PTR(err);
 382 }
 383
 384 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 385                                       struct mmc_blk_ioc_data *idata)
 386 {
 387         struct mmc_ioc_cmd *ic = &idata->ic;
 388
 389         if (copy_to_user(&(ic_ptr->response), ic->response,
 390                          sizeof(ic->response)))
 391                 return -EFAULT;
 392
 393         if (!idata->ic.write_flag) {
 394                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 395                                  idata->buf, idata->buf_bytes))
 396                         return -EFAULT;
 397         }
 398
 399         return 0;
 400 }
 401
 402 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 403                                        u32 retries_max)
 404 {
 405         int err;
 406         u32 retry_count = 0;
 407
 408         if (!status || !retries_max)
 409                 return -EINVAL;
 410
 411         do {
 412                 err = get_card_status(card, status, 5);
 413                 if (err)
 414                         break;
 415
 416                 if (!R1_STATUS(*status) &&
 417                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 418                         break; /* RPMB programming operation complete */
 419
 420                 /*
 421                  * Rechedule to give the MMC device a chance to continue
 422                  * processing the previous command without being polled too
 423                  * frequently.
 424                  */
 425                 usleep_range(1000, 5000);
 426         } while (++retry_count < retries_max);
 427
 428         if (retry_count == retries_max)
 429                 err = -EPERM;
 430
 431         return err;
 432 }
 433
 434 static int ioctl_do_sanitize(struct mmc_card *card)
 435 {
 436         int err;
 437
 438         if (!mmc_can_sanitize(card)) {
 439                         pr_warn("%s: %s - SANITIZE is not supported\n",
 440                                 mmc_hostname(card->host), __func__);
 441                         err = -EOPNOTSUPP;
 442                         goto out;
 443         }
 444
 445         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 446                 mmc_hostname(card->host), __func__);
 447
 448         trace_mmc_blk_erase_start(EXT_CSD_SANITIZE_START, 0, 0);
 449         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 450                                         EXT_CSD_SANITIZE_START, 1,
 451                                         MMC_SANITIZE_REQ_TIMEOUT);
 452         trace_mmc_blk_erase_end(EXT_CSD_SANITIZE_START, 0, 0);
 453
 454         if (err)
 455                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 456                        mmc_hostname(card->host), __func__, err);
 457
 458         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 459                                              __func__);
 460 out:
 461         return err;
 462 }
 463
 464 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 465                                struct mmc_blk_ioc_data *idata)
 466 {
 467         struct mmc_command cmd = {0};
 468         struct mmc_data data = {0};
 469         struct mmc_request mrq = {NULL};
 470         struct scatterlist sg;
 471         int err;
 472         int is_rpmb = false;
 473         u32 status = 0;
 474
 475         if (!card || !md || !idata)
 476                 return -EINVAL;
 477
 478         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 479                 is_rpmb = true;
 480
 481         cmd.opcode = idata->ic.opcode;
 482         cmd.arg = idata->ic.arg;
 483         cmd.flags = idata->ic.flags;
 484
 485         if (idata->buf_bytes) {
 486                 data.sg = &sg;
 487                 data.sg_len = 1;
 488                 data.blksz = idata->ic.blksz;
 489                 data.blocks = idata->ic.blocks;
 490
 491                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 492
 493                 if (idata->ic.write_flag)
 494                         data.flags = MMC_DATA_WRITE;
 495                 else
 496                         data.flags = MMC_DATA_READ;
 497
 498                 /* data.flags must already be set before doing this. */
 499                 mmc_set_data_timeout(&data, card);
 500
 501                 /* Allow overriding the timeout_ns for empirical tuning. */
 502                 if (idata->ic.data_timeout_ns)
 503                         data.timeout_ns = idata->ic.data_timeout_ns;
 504
 505                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 506                         /*
 507                          * Pretend this is a data transfer and rely on the
 508                          * host driver to compute timeout.  When all host
 509                          * drivers support cmd.cmd_timeout for R1B, this
 510                          * can be changed to:
 511                          *
 512                          *     mrq.data = NULL;
 513                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 514                          */
 515                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 516                 }
 517
 518                 mrq.data = &data;
 519         }
 520
 521         mrq.cmd = &cmd;
 522
 523         err = mmc_blk_part_switch(card, md);
 524         if (err)
 525                 return err;
 526
 527         if (idata->ic.is_acmd) {
 528                 err = mmc_app_cmd(card->host, card);
 529                 if (err)
 530                         return err;
 531         }
 532
 533         if (is_rpmb) {
 534                 err = mmc_set_blockcount(card, data.blocks,
 535                         idata->ic.write_flag & (1 << 31));
 536                 if (err)
 537                         return err;
 538         }
 539
 540         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 541             (cmd.opcode == MMC_SWITCH)) {
 542                 err = ioctl_do_sanitize(card);
 543
 544                 if (err)
 545                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 546                                __func__, err);
 547
 548                 return err;
 549         }
 550
 551         mmc_wait_for_req(card->host, &mrq);
 552
 553         if (cmd.error) {
 554                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 555                                                 __func__, cmd.error);
 556                 return cmd.error;
 557         }
 558         if (data.error) {
 559                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 560                                                 __func__, data.error);
 561                 return data.error;
 562         }
 563
 564         /*
 565          * According to the SD specs, some commands require a delay after
 566          * issuing the command.
 567          */
 568         if (idata->ic.postsleep_min_us)
 569                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 570
 571         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 572
 573         if (is_rpmb) {
 574                 /*
 575                  * Ensure RPMB command has completed by polling CMD13
 576                  * "Send Status".
 577                  */
 578                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 579                 if (err)
 580                         dev_err(mmc_dev(card->host),
 581                                         "%s: Card Status=0x%08X, error %d\n",
 582                                         __func__, status, err);
 583         }
 584
 585         return err;
 586 }
 587
 588 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 589                              struct mmc_ioc_cmd __user *ic_ptr)
 590 {
 591         struct mmc_blk_ioc_data *idata;
 592         struct mmc_blk_data *md;
 593         struct mmc_card *card;
 594         int err = 0, ioc_err = 0;
 595
 596         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 597         if (IS_ERR(idata))
 598                 return PTR_ERR(idata);
 599
 600         md = mmc_blk_get(bdev->bd_disk);
 601         if (!md) {
 602                 err = -EINVAL;
 603                 goto cmd_err;
 604         }
 605
 606         card = md->queue.card;
 607         if (IS_ERR(card)) {
 608                 err = PTR_ERR(card);
 609                 goto cmd_done;
 610         }
 611
 612         mmc_get_card(card);
 613
 614         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 615
 616         mmc_put_card(card);
 617
 618         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 619
 620 cmd_done:
 621         mmc_blk_put(md);
 622 cmd_err:
 623         kfree(idata->buf);
 624         kfree(idata);
 625         return ioc_err ? ioc_err : err;
 626 }
 627
 628 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 629                                    struct mmc_ioc_multi_cmd __user *user)
 630 {
 631         struct mmc_blk_ioc_data **idata = NULL;
 632         struct mmc_ioc_cmd __user *cmds = user->cmds;
 633         struct mmc_card *card;
 634         struct mmc_blk_data *md;
 635         int i, err = 0, ioc_err = 0;
 636         __u64 num_of_cmds;
 637
 638         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 639                            sizeof(num_of_cmds)))
 640                 return -EFAULT;
 641
 642         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 643                 return -EINVAL;
 644
 645         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 646         if (!idata)
 647                 return -ENOMEM;
 648
 649         for (i = 0; i < num_of_cmds; i++) {
 650                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 651                 if (IS_ERR(idata[i])) {
 652                         err = PTR_ERR(idata[i]);
 653                         num_of_cmds = i;
 654                         goto cmd_err;
 655                 }
 656         }
 657
 658         md = mmc_blk_get(bdev->bd_disk);
 659         if (!md)
 660                 goto cmd_err;
 661
 662         card = md->queue.card;
 663         if (IS_ERR(card)) {
 664                 err = PTR_ERR(card);
 665                 goto cmd_done;
 666         }
 667
 668         mmc_get_card(card);
 669
 670         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 671                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 672
 673         mmc_put_card(card);
 674
 675         /* copy to user if data and response */
 676         for (i = 0; i < num_of_cmds && !err; i++)
 677                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 678
 679 cmd_done:
 680         mmc_blk_put(md);
 681 cmd_err:
 682         for (i = 0; i < num_of_cmds; i++) {
 683                 kfree(idata[i]->buf);
 684                 kfree(idata[i]);
 685         }
 686         kfree(idata);
 687         return ioc_err ? ioc_err : err;
 688 }
 689
 690 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 691         unsigned int cmd, unsigned long arg)
 692 {
 693         /*
 694          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 695          * whole block device, not on a partition.  This prevents overspray
 696          * between sibling partitions.
 697          */
 698         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 699                 return -EPERM;
 700
 701         switch (cmd) {
 702         case MMC_IOC_CMD:
 703                 return mmc_blk_ioctl_cmd(bdev,
 704                                 (struct mmc_ioc_cmd __user *)arg);
 705         case MMC_IOC_MULTI_CMD:
 706                 return mmc_blk_ioctl_multi_cmd(bdev,
 707                                 (struct mmc_ioc_multi_cmd __user *)arg);
 708         default:
 709                 return -EINVAL;
 710         }
 711 }
 712
 713 #ifdef CONFIG_COMPAT
 714 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 715         unsigned int cmd, unsigned long arg)
 716 {
 717         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 718 }
 719 #endif
 720
 721 static const struct block_device_operations mmc_bdops = {
 722         .open                   = mmc_blk_open,
 723         .release                = mmc_blk_release,
 724         .getgeo                 = mmc_blk_getgeo,
 725         .owner                  = THIS_MODULE,
 726         .ioctl                  = mmc_blk_ioctl,
 727 #ifdef CONFIG_COMPAT
 728         .compat_ioctl           = mmc_blk_compat_ioctl,
 729 #endif
 730 };
 731
 732 static inline int mmc_blk_part_switch(struct mmc_card *card,
 733                                       struct mmc_blk_data *md)
 734 {
 735         int ret;
 736         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 737
 738         if (main_md->part_curr == md->part_type)
 739                 return 0;
 740
 741         if (mmc_card_mmc(card)) {
 742                 u8 part_config = card->ext_csd.part_config;
 743
 744                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 745                 part_config |= md->part_type;
 746
 747                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 748                                  EXT_CSD_PART_CONFIG, part_config,
 749                                  card->ext_csd.part_time);
 750                 if (ret)
 751                         return ret;
 752
 753                 card->ext_csd.part_config = part_config;
 754         }
 755
 756         main_md->part_curr = md->part_type;
 757         return 0;
 758 }
 759
 760 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 761 {
 762         int err;
 763         u32 result;
 764         __be32 *blocks;
 765
 766         struct mmc_request mrq = {NULL};
 767         struct mmc_command cmd = {0};
 768         struct mmc_data data = {0};
 769
 770         struct scatterlist sg;
 771
 772         cmd.opcode = MMC_APP_CMD;
 773         cmd.arg = card->rca << 16;
 774         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 775
 776         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 777         if (err)
 778                 return (u32)-1;
 779         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 780                 return (u32)-1;
 781
 782         memset(&cmd, 0, sizeof(struct mmc_command));
 783
 784         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 785         cmd.arg = 0;
 786         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 787
 788         data.blksz = 4;
 789         data.blocks = 1;
 790         data.flags = MMC_DATA_READ;
 791         data.sg = &sg;
 792         data.sg_len = 1;
 793         mmc_set_data_timeout(&data, card);
 794
 795         mrq.cmd = &cmd;
 796         mrq.data = &data;
 797
 798         blocks = kmalloc(4, GFP_KERNEL);
 799         if (!blocks)
 800                 return (u32)-1;
 801
 802         sg_init_one(&sg, blocks, 4);
 803
 804         mmc_wait_for_req(card->host, &mrq);
 805
 806         result = ntohl(*blocks);
 807         kfree(blocks);
 808
 809         if (cmd.error || data.error)
 810                 result = (u32)-1;
 811
 812         return result;
 813 }
 814
 815 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 816 {
 817         struct mmc_command cmd = {0};
 818         int err;
 819
 820         cmd.opcode = MMC_SEND_STATUS;
 821         if (!mmc_host_is_spi(card->host))
 822                 cmd.arg = card->rca << 16;
 823         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 824         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 825         if (err == 0)
 826                 *status = cmd.resp[0];
 827         return err;
 828 }
 829
 830 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 831                 bool hw_busy_detect, struct request *req, int *gen_err)
 832 {
 833         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 834         int err = 0;
 835         u32 status;
 836
 837         do {
 838                 err = get_card_status(card, &status, 5);
 839                 if (err) {
 840                         pr_err("%s: error %d requesting status\n",
 841                                req->rq_disk->disk_name, err);
 842                         return err;
 843                 }
 844
 845                 if (status & R1_ERROR) {
 846                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 847                                 req->rq_disk->disk_name, __func__, status);
 848                         *gen_err = 1;
 849                 }
 850
 851                 /* We may rely on the host hw to handle busy detection.*/
 852                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 853                         hw_busy_detect)
 854                         break;
 855
 856                 /*
 857                  * Timeout if the device never becomes ready for data and never
 858                  * leaves the program state.
 859                  */
 860                 if (time_after(jiffies, timeout)) {
 861                         pr_err("%s: Card stuck in programming state! %s %s\n",
 862                                 mmc_hostname(card->host),
 863                                 req->rq_disk->disk_name, __func__);
 864                         return -ETIMEDOUT;
 865                 }
 866
 867                 /*
 868                  * Some cards mishandle the status bits,
 869                  * so make sure to check both the busy
 870                  * indication and the card state.
 871                  */
 872         } while (!(status & R1_READY_FOR_DATA) ||
 873                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 874
 875         return err;
 876 }
 877
 878 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 879                 struct request *req, int *gen_err, u32 *stop_status)
 880 {
 881         struct mmc_host *host = card->host;
 882         struct mmc_command cmd = {0};
 883         int err;
 884         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 885
 886         /*
 887          * Normally we use R1B responses for WRITE, but in cases where the host
 888          * has specified a max_busy_timeout we need to validate it. A failure
 889          * means we need to prevent the host from doing hw busy detection, which
 890          * is done by converting to a R1 response instead.
 891          */
 892         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 893                 use_r1b_resp = false;
 894
 895         cmd.opcode = MMC_STOP_TRANSMISSION;
 896         if (use_r1b_resp) {
 897                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 898                 cmd.busy_timeout = timeout_ms;
 899         } else {
 900                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 901         }
 902
 903         err = mmc_wait_for_cmd(host, &cmd, 5);
 904         if (err)
 905                 return err;
 906
 907         *stop_status = cmd.resp[0];
 908
 909         /* No need to check card status in case of READ. */
 910         if (rq_data_dir(req) == READ)
 911                 return 0;
 912
 913         if (!mmc_host_is_spi(host) &&
 914                 (*stop_status & R1_ERROR)) {
 915                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 916                         req->rq_disk->disk_name, __func__, *stop_status);
 917                 *gen_err = 1;
 918         }
 919
 920         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 921 }
 922
 923 #define ERR_NOMEDIUM    3
 924 #define ERR_RETRY       2
 925 #define ERR_ABORT       1
 926 #define ERR_CONTINUE    0
 927
 928 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 929         bool status_valid, u32 status)
 930 {
 931         switch (error) {
 932         case -EILSEQ:
 933                 /* response crc error, retry the r/w cmd */
 934                 pr_err("%s: %s sending %s command, card status %#x\n",
 935                         req->rq_disk->disk_name, "response CRC error",
 936                         name, status);
 937                 return ERR_RETRY;
 938
 939         case -ETIMEDOUT:
 940                 pr_err("%s: %s sending %s command, card status %#x\n",
 941                         req->rq_disk->disk_name, "timed out", name, status);
 942
 943                 /* If the status cmd initially failed, retry the r/w cmd */
 944                 if (!status_valid) {
 945                         pr_err("%s: status not valid, retrying timeout\n", req->rq_disk->disk_name);
 946                         return ERR_RETRY;
 947                 }
 948                 /*
 949                  * If it was a r/w cmd crc error, or illegal command
 950                  * (eg, issued in wrong state) then retry - we should
 951                  * have corrected the state problem above.
 952                  */
 953                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 954                         pr_err("%s: command error, retrying timeout\n", req->rq_disk->disk_name);
 955                         return ERR_RETRY;
 956                 }
 957
 958                 /* Otherwise abort the command */
 959                 pr_err("%s: not retrying timeout\n", req->rq_disk->disk_name);
 960                 return ERR_ABORT;
 961
 962         default:
 963                 /* We don't understand the error code the driver gave us */
 964                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 965                        req->rq_disk->disk_name, error, status);
 966                 return ERR_ABORT;
 967         }
 968 }
 969
 970 /*
 971  * Initial r/w and stop cmd error recovery.
 972  * We don't know whether the card received the r/w cmd or not, so try to
 973  * restore things back to a sane state.  Essentially, we do this as follows:
 974  * - Obtain card status.  If the first attempt to obtain card status fails,
 975  *   the status word will reflect the failed status cmd, not the failed
 976  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 977  *   longer communicate with the card.
 978  * - Check the card state.  If the card received the cmd but there was a
 979  *   transient problem with the response, it might still be in a data transfer
 980  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 981  * - If the r/w cmd failed due to a response CRC error, it was probably
 982  *   transient, so retry the cmd.
 983  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 984  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 985  *   illegal cmd, retry.
 986  * Otherwise we don't understand what happened, so abort.
 987  */
 988 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 989         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 990 {
 991         bool prev_cmd_status_valid = true;
 992         u32 status, stop_status = 0;
 993         int err, retry;
 994
 995         if (mmc_card_removed(card))
 996                 return ERR_NOMEDIUM;
 997
 998         /*
 999          * Try to get card status which indicates both the card state
1000          * and why there was no response.  If the first attempt fails,
1001          * we can't be sure the returned status is for the r/w command.
1002          */
1003         for (retry = 2; retry >= 0; retry--) {
1004                 err = get_card_status(card, &status, 0);
1005                 if (!err)
1006                         break;
1007
1008                 /* Re-tune if needed */
1009                 mmc_retune_recheck(card->host);
1010
1011                 prev_cmd_status_valid = false;
1012                 pr_err("%s: error %d sending status command, %sing\n",
1013                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1014         }
1015
1016         /* We couldn't get a response from the card.  Give up. */
1017         if (err) {
1018                 /* Check if the card is removed */
1019                 if (mmc_detect_card_removed(card->host))
1020                         return ERR_NOMEDIUM;
1021                 return ERR_ABORT;
1022         }
1023
1024         /* Flag ECC errors */
1025         if ((status & R1_CARD_ECC_FAILED) ||
1026             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1027             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1028                 *ecc_err = 1;
1029
1030         /* Flag General errors */
1031         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1032                 if ((status & R1_ERROR) ||
1033                         (brq->stop.resp[0] & R1_ERROR)) {
1034                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1035                                req->rq_disk->disk_name, __func__,
1036                                brq->stop.resp[0], status);
1037                         *gen_err = 1;
1038                 }
1039
1040         /*
1041          * Check the current card state.  If it is in some data transfer
1042          * mode, tell it to stop (and hopefully transition back to TRAN.)
1043          */
1044         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1045             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1046                 err = send_stop(card,
1047                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1048                         req, gen_err, &stop_status);
1049                 if (err) {
1050                         pr_err("%s: error %d sending stop command\n",
1051                                req->rq_disk->disk_name, err);
1052                         /*
1053                          * If the stop cmd also timed out, the card is probably
1054                          * not present, so abort. Other errors are bad news too.
1055                          */
1056                         return ERR_ABORT;
1057                 }
1058
1059                 if (stop_status & R1_CARD_ECC_FAILED)
1060                         *ecc_err = 1;
1061         }
1062
1063         /* Check for set block count errors */
1064         if (brq->sbc.error)
1065                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1066                                 prev_cmd_status_valid, status);
1067
1068         /* Check for r/w command errors */
1069         if (brq->cmd.error)
1070                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1071                                 prev_cmd_status_valid, status);
1072
1073         /* Data errors */
1074         if (!brq->stop.error)
1075                 return ERR_CONTINUE;
1076
1077         /* Now for stop errors.  These aren't fatal to the transfer. */
1078         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1079                req->rq_disk->disk_name, brq->stop.error,
1080                brq->cmd.resp[0], status);
1081
1082         /*
1083          * Subsitute in our own stop status as this will give the error
1084          * state which happened during the execution of the r/w command.
1085          */
1086         if (stop_status) {
1087                 brq->stop.resp[0] = stop_status;
1088                 brq->stop.error = 0;
1089         }
1090         return ERR_CONTINUE;
1091 }
1092
1093 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1094                          int type)
1095 {
1096         int err;
1097
1098         if (md->reset_done & type)
1099                 return -EEXIST;
1100
1101         md->reset_done |= type;
1102         err = mmc_hw_reset(host);
1103         /* Ensure we switch back to the correct partition */
1104         if (err != -EOPNOTSUPP) {
1105                 struct mmc_blk_data *main_md =
1106                         dev_get_drvdata(&host->card->dev);
1107                 int part_err;
1108
1109                 main_md->part_curr = main_md->part_type;
1110                 part_err = mmc_blk_part_switch(host->card, md);
1111                 if (part_err) {
1112                         /*
1113                          * We have failed to get back into the correct
1114                          * partition, so we need to abort the whole request.
1115                          */
1116                         return -ENODEV;
1117                 }
1118         }
1119         return err;
1120 }
1121
1122 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1123 {
1124         md->reset_done &= ~type;
1125 }
1126
1127 int mmc_access_rpmb(struct mmc_queue *mq)
1128 {
1129         struct mmc_blk_data *md = mq->data;
1130         /*
1131          * If this is a RPMB partition access, return ture
1132          */
1133         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1134                 return true;
1135
1136         return false;
1137 }
1138
1139 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1140 {
1141         struct mmc_blk_data *md = mq->data;
1142         struct mmc_card *card = md->queue.card;
1143         unsigned int from, nr, arg;
1144         int err = 0, type = MMC_BLK_DISCARD;
1145
1146         if (!mmc_can_erase(card)) {
1147                 err = -EOPNOTSUPP;
1148                 goto out;
1149         }
1150
1151         from = blk_rq_pos(req);
1152         nr = blk_rq_sectors(req);
1153
1154         if (mmc_can_discard(card))
1155                 arg = MMC_DISCARD_ARG;
1156         else if (mmc_can_trim(card))
1157                 arg = MMC_TRIM_ARG;
1158         else
1159                 arg = MMC_ERASE_ARG;
1160 retry:
1161         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1162                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1163                                  INAND_CMD38_ARG_EXT_CSD,
1164                                  arg == MMC_TRIM_ARG ?
1165                                  INAND_CMD38_ARG_TRIM :
1166                                  INAND_CMD38_ARG_ERASE,
1167                                  0);
1168                 if (err)
1169                         goto out;
1170         }
1171         err = mmc_erase(card, from, nr, arg);
1172 out:
1173         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1174                 goto retry;
1175         if (!err)
1176                 mmc_blk_reset_success(md, type);
1177         blk_end_request(req, err, blk_rq_bytes(req));
1178
1179         return err ? 0 : 1;
1180 }
1181
1182 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1183                                        struct request *req)
1184 {
1185         struct mmc_blk_data *md = mq->data;
1186         struct mmc_card *card = md->queue.card;
1187         unsigned int from, nr, arg;
1188         int err = 0, type = MMC_BLK_SECDISCARD;
1189
1190         if (!(mmc_can_secure_erase_trim(card))) {
1191                 err = -EOPNOTSUPP;
1192                 goto out;
1193         }
1194
1195         from = blk_rq_pos(req);
1196         nr = blk_rq_sectors(req);
1197
1198         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1199                 arg = MMC_SECURE_TRIM1_ARG;
1200         else
1201                 arg = MMC_SECURE_ERASE_ARG;
1202
1203 retry:
1204         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1205                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1206                                  INAND_CMD38_ARG_EXT_CSD,
1207                                  arg == MMC_SECURE_TRIM1_ARG ?
1208                                  INAND_CMD38_ARG_SECTRIM1 :
1209                                  INAND_CMD38_ARG_SECERASE,
1210                                  0);
1211                 if (err)
1212                         goto out_retry;
1213         }
1214
1215         err = mmc_erase(card, from, nr, arg);
1216         if (err == -EIO)
1217                 goto out_retry;
1218         if (err)
1219                 goto out;
1220
1221         if (arg == MMC_SECURE_TRIM1_ARG) {
1222                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1223                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1224                                          INAND_CMD38_ARG_EXT_CSD,
1225                                          INAND_CMD38_ARG_SECTRIM2,
1226                                          0);
1227                         if (err)
1228                                 goto out_retry;
1229                 }
1230
1231                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1232                 if (err == -EIO)
1233                         goto out_retry;
1234                 if (err)
1235                         goto out;
1236         }
1237
1238 out_retry:
1239         if (err && !mmc_blk_reset(md, card->host, type))
1240                 goto retry;
1241         if (!err)
1242                 mmc_blk_reset_success(md, type);
1243 out:
1244         blk_end_request(req, err, blk_rq_bytes(req));
1245
1246         return err ? 0 : 1;
1247 }
1248
1249 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1250 {
1251         struct mmc_blk_data *md = mq->data;
1252         struct mmc_card *card = md->queue.card;
1253         int ret = 0;
1254
1255         ret = mmc_flush_cache(card);
1256         if (ret)
1257                 ret = -EIO;
1258
1259         blk_end_request_all(req, ret);
1260
1261         return ret ? 0 : 1;
1262 }
1263
1264 /*
1265  * Reformat current write as a reliable write, supporting
1266  * both legacy and the enhanced reliable write MMC cards.
1267  * In each transfer we'll handle only as much as a single
1268  * reliable write can handle, thus finish the request in
1269  * partial completions.
1270  */
1271 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1272                                     struct mmc_card *card,
1273                                     struct request *req)
1274 {
1275         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1276                 /* Legacy mode imposes restrictions on transfers. */
1277                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1278                         brq->data.blocks = 1;
1279
1280                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1281                         brq->data.blocks = card->ext_csd.rel_sectors;
1282                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1283                         brq->data.blocks = 1;
1284         }
1285 }
1286
1287 #define CMD_ERRORS                                                      \
1288         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1289          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1290          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1291          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1292          R1_CC_ERROR |          /* Card controller error */             \
1293          R1_ERROR)              /* General/unknown error */
1294
1295 static int mmc_blk_err_check(struct mmc_card *card,
1296                              struct mmc_async_req *areq)
1297 {
1298         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1299                                                     mmc_active);
1300         struct mmc_blk_request *brq = &mq_mrq->brq;
1301         struct request *req = mq_mrq->req;
1302         int need_retune = card->host->need_retune;
1303         int ecc_err = 0, gen_err = 0;
1304
1305         /*
1306          * sbc.error indicates a problem with the set block count
1307          * command.  No data will have been transferred.
1308          *
1309          * cmd.error indicates a problem with the r/w command.  No
1310          * data will have been transferred.
1311          *
1312          * stop.error indicates a problem with the stop command.  Data
1313          * may have been transferred, or may still be transferring.
1314          */
1315         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1316             brq->data.error) {
1317                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1318                 case ERR_RETRY:
1319                         return MMC_BLK_RETRY;
1320                 case ERR_ABORT:
1321                         return MMC_BLK_ABORT;
1322                 case ERR_NOMEDIUM:
1323                         return MMC_BLK_NOMEDIUM;
1324                 case ERR_CONTINUE:
1325                         break;
1326                 }
1327         }
1328
1329         /*
1330          * Check for errors relating to the execution of the
1331          * initial command - such as address errors.  No data
1332          * has been transferred.
1333          */
1334         if (brq->cmd.resp[0] & CMD_ERRORS) {
1335                 pr_err("%s: r/w command failed, status = %#x\n",
1336                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1337                 return MMC_BLK_ABORT;
1338         }
1339
1340         /*
1341          * Everything else is either success, or a data error of some
1342          * kind.  If it was a write, we may have transitioned to
1343          * program mode, which we have to wait for it to complete.
1344          */
1345         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1346                 int err;
1347
1348                 /* Check stop command response */
1349                 if (brq->stop.resp[0] & R1_ERROR) {
1350                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1351                                req->rq_disk->disk_name, __func__,
1352                                brq->stop.resp[0]);
1353                         gen_err = 1;
1354                 }
1355
1356                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1357                                         &gen_err);
1358                 if (err)
1359                         return MMC_BLK_CMD_ERR;
1360         }
1361
1362         /* if general error occurs, retry the write operation. */
1363         if (gen_err) {
1364                 pr_warn("%s: retrying write for general error\n",
1365                                 req->rq_disk->disk_name);
1366                 return MMC_BLK_RETRY;
1367         }
1368
1369         if (brq->data.error) {
1370                 if (need_retune && !brq->retune_retry_done) {
1371                         pr_info("%s: retrying because a re-tune was needed\n",
1372                                 req->rq_disk->disk_name);
1373                         brq->retune_retry_done = 1;
1374                         return MMC_BLK_RETRY;
1375                 }
1376                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1377                        req->rq_disk->disk_name, brq->data.error,
1378                        (unsigned)blk_rq_pos(req),
1379                        (unsigned)blk_rq_sectors(req),
1380                        brq->cmd.resp[0], brq->stop.resp[0]);
1381
1382                 if (rq_data_dir(req) == READ) {
1383                         if (ecc_err)
1384                                 return MMC_BLK_ECC_ERR;
1385                         return MMC_BLK_DATA_ERR;
1386                 } else {
1387                         return MMC_BLK_CMD_ERR;
1388                 }
1389         }
1390
1391         if (!brq->data.bytes_xfered)
1392                 return MMC_BLK_RETRY;
1393
1394         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1395                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1396                         return MMC_BLK_PARTIAL;
1397                 else
1398                         return MMC_BLK_SUCCESS;
1399         }
1400
1401         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1402                 return MMC_BLK_PARTIAL;
1403
1404         return MMC_BLK_SUCCESS;
1405 }
1406
1407 static int mmc_blk_packed_err_check(struct mmc_card *card,
1408                                     struct mmc_async_req *areq)
1409 {
1410         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1411                         mmc_active);
1412         struct request *req = mq_rq->req;
1413         struct mmc_packed *packed = mq_rq->packed;
1414         int err, check, status;
1415         u8 *ext_csd;
1416
1417         BUG_ON(!packed);
1418
1419         packed->retries--;
1420         check = mmc_blk_err_check(card, areq);
1421         err = get_card_status(card, &status, 0);
1422         if (err) {
1423                 pr_err("%s: error %d sending status command\n",
1424                        req->rq_disk->disk_name, err);
1425                 return MMC_BLK_ABORT;
1426         }
1427
1428         if (status & R1_EXCEPTION_EVENT) {
1429                 err = mmc_get_ext_csd(card, &ext_csd);
1430                 if (err) {
1431                         pr_err("%s: error %d sending ext_csd\n",
1432                                req->rq_disk->disk_name, err);
1433                         return MMC_BLK_ABORT;
1434                 }
1435
1436                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1437                      EXT_CSD_PACKED_FAILURE) &&
1438                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1439                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1440                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1441                             EXT_CSD_PACKED_INDEXED_ERROR) {
1442                                 packed->idx_failure =
1443                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1444                                 check = MMC_BLK_PARTIAL;
1445                         }
1446                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1447                                "failure index: %d\n",
1448                                req->rq_disk->disk_name, packed->nr_entries,
1449                                packed->blocks, packed->idx_failure);
1450                 }
1451                 kfree(ext_csd);
1452         }
1453
1454         return check;
1455 }
1456
1457 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1458                                struct mmc_card *card,
1459                                int disable_multi,
1460                                struct mmc_queue *mq)
1461 {
1462         u32 readcmd, writecmd;
1463         struct mmc_blk_request *brq = &mqrq->brq;
1464         struct request *req = mqrq->req;
1465         struct mmc_blk_data *md = mq->data;
1466         bool do_data_tag;
1467
1468         /*
1469          * Reliable writes are used to implement Forced Unit Access and
1470          * are supported only on MMCs.
1471          */
1472         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1473                 (rq_data_dir(req) == WRITE) &&
1474                 (md->flags & MMC_BLK_REL_WR);
1475
1476         memset(brq, 0, sizeof(struct mmc_blk_request));
1477         brq->mrq.cmd = &brq->cmd;
1478         brq->mrq.data = &brq->data;
1479
1480         brq->cmd.arg = blk_rq_pos(req);
1481         if (!mmc_card_blockaddr(card))
1482                 brq->cmd.arg <<= 9;
1483         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1484         brq->data.blksz = 512;
1485         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1486         brq->stop.arg = 0;
1487         brq->data.blocks = blk_rq_sectors(req);
1488
1489         /*
1490          * The block layer doesn't support all sector count
1491          * restrictions, so we need to be prepared for too big
1492          * requests.
1493          */
1494         if (brq->data.blocks > card->host->max_blk_count)
1495                 brq->data.blocks = card->host->max_blk_count;
1496
1497         if (brq->data.blocks > 1) {
1498                 /*
1499                  * After a read error, we redo the request one sector
1500                  * at a time in order to accurately determine which
1501                  * sectors can be read successfully.
1502                  */
1503                 if (disable_multi)
1504                         brq->data.blocks = 1;
1505
1506                 /*
1507                  * Some controllers have HW issues while operating
1508                  * in multiple I/O mode
1509                  */
1510                 if (card->host->ops->multi_io_quirk)
1511                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1512                                                 (rq_data_dir(req) == READ) ?
1513                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1514                                                 brq->data.blocks);
1515         }
1516
1517         if (brq->data.blocks > 1 || do_rel_wr) {
1518                 /* SPI multiblock writes terminate using a special
1519                  * token, not a STOP_TRANSMISSION request.
1520                  */
1521                 if (!mmc_host_is_spi(card->host) ||
1522                     rq_data_dir(req) == READ)
1523                         brq->mrq.stop = &brq->stop;
1524                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1525                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1526         } else {
1527                 brq->mrq.stop = NULL;
1528                 readcmd = MMC_READ_SINGLE_BLOCK;
1529                 writecmd = MMC_WRITE_BLOCK;
1530         }
1531         if (rq_data_dir(req) == READ) {
1532                 brq->cmd.opcode = readcmd;
1533                 brq->data.flags |= MMC_DATA_READ;
1534                 if (brq->mrq.stop)
1535                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1536                                         MMC_CMD_AC;
1537         } else {
1538                 brq->cmd.opcode = writecmd;
1539                 brq->data.flags |= MMC_DATA_WRITE;
1540                 if (brq->mrq.stop)
1541                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1542                                         MMC_CMD_AC;
1543         }
1544
1545         if (do_rel_wr)
1546                 mmc_apply_rel_rw(brq, card, req);
1547
1548         /*
1549          * Data tag is used only during writing meta data to speed
1550          * up write and any subsequent read of this meta data
1551          */
1552         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1553                 (req->cmd_flags & REQ_META) &&
1554                 (rq_data_dir(req) == WRITE) &&
1555                 ((brq->data.blocks * brq->data.blksz) >=
1556                  card->ext_csd.data_tag_unit_size);
1557
1558         /*
1559          * Pre-defined multi-block transfers are preferable to
1560          * open ended-ones (and necessary for reliable writes).
1561          * However, it is not sufficient to just send CMD23,
1562          * and avoid the final CMD12, as on an error condition
1563          * CMD12 (stop) needs to be sent anyway. This, coupled
1564          * with Auto-CMD23 enhancements provided by some
1565          * hosts, means that the complexity of dealing
1566          * with this is best left to the host. If CMD23 is
1567          * supported by card and host, we'll fill sbc in and let
1568          * the host deal with handling it correctly. This means
1569          * that for hosts that don't expose MMC_CAP_CMD23, no
1570          * change of behavior will be observed.
1571          *
1572          * N.B: Some MMC cards experience perf degradation.
1573          * We'll avoid using CMD23-bounded multiblock writes for
1574          * these, while retaining features like reliable writes.
1575          */
1576         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1577             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1578              do_data_tag)) {
1579                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1580                 brq->sbc.arg = brq->data.blocks |
1581                         (do_rel_wr ? (1 << 31) : 0) |
1582                         (do_data_tag ? (1 << 29) : 0);
1583                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1584                 brq->mrq.sbc = &brq->sbc;
1585         }
1586
1587         mmc_set_data_timeout(&brq->data, card);
1588
1589         brq->data.sg = mqrq->sg;
1590         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1591
1592         /*
1593          * Adjust the sg list so it is the same size as the
1594          * request.
1595          */
1596         if (brq->data.blocks != blk_rq_sectors(req)) {
1597                 int i, data_size = brq->data.blocks << 9;
1598                 struct scatterlist *sg;
1599
1600                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1601                         data_size -= sg->length;
1602                         if (data_size <= 0) {
1603                                 sg->length += data_size;
1604                                 i++;
1605                                 break;
1606                         }
1607                 }
1608                 brq->data.sg_len = i;
1609         }
1610
1611         mqrq->mmc_active.mrq = &brq->mrq;
1612         mqrq->mmc_active.err_check = mmc_blk_err_check;
1613
1614         mmc_queue_bounce_pre(mqrq);
1615 }
1616
1617 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1618                                           struct mmc_card *card)
1619 {
1620         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1621         unsigned int max_seg_sz = queue_max_segment_size(q);
1622         unsigned int len, nr_segs = 0;
1623
1624         do {
1625                 len = min(hdr_sz, max_seg_sz);
1626                 hdr_sz -= len;
1627                 nr_segs++;
1628         } while (hdr_sz);
1629
1630         return nr_segs;
1631 }
1632
1633 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1634 {
1635         struct request_queue *q = mq->queue;
1636         struct mmc_card *card = mq->card;
1637         struct request *cur = req, *next = NULL;
1638         struct mmc_blk_data *md = mq->data;
1639         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1640         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1641         unsigned int req_sectors = 0, phys_segments = 0;
1642         unsigned int max_blk_count, max_phys_segs;
1643         bool put_back = true;
1644         u8 max_packed_rw = 0;
1645         u8 reqs = 0;
1646
1647         if (!(md->flags & MMC_BLK_PACKED_CMD))
1648                 goto no_packed;
1649
1650         if ((rq_data_dir(cur) == WRITE) &&
1651             mmc_host_packed_wr(card->host))
1652                 max_packed_rw = card->ext_csd.max_packed_writes;
1653
1654         if (max_packed_rw == 0)
1655                 goto no_packed;
1656
1657         if (mmc_req_rel_wr(cur) &&
1658             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1659                 goto no_packed;
1660
1661         if (mmc_large_sector(card) &&
1662             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1663                 goto no_packed;
1664
1665         mmc_blk_clear_packed(mqrq);
1666
1667         max_blk_count = min(card->host->max_blk_count,
1668                             card->host->max_req_size >> 9);
1669         if (unlikely(max_blk_count > 0xffff))
1670                 max_blk_count = 0xffff;
1671
1672         max_phys_segs = queue_max_segments(q);
1673         req_sectors += blk_rq_sectors(cur);
1674         phys_segments += cur->nr_phys_segments;
1675
1676         if (rq_data_dir(cur) == WRITE) {
1677                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1678                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1679         }
1680
1681         do {
1682                 if (reqs >= max_packed_rw - 1) {
1683                         put_back = false;
1684                         break;
1685                 }
1686
1687                 spin_lock_irq(q->queue_lock);
1688                 next = blk_fetch_request(q);
1689                 spin_unlock_irq(q->queue_lock);
1690                 if (!next) {
1691                         put_back = false;
1692                         break;
1693                 }
1694
1695                 if (mmc_large_sector(card) &&
1696                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1697                         break;
1698
1699                 if (next->cmd_flags & REQ_DISCARD ||
1700                     next->cmd_flags & REQ_FLUSH)
1701                         break;
1702
1703                 if (rq_data_dir(cur) != rq_data_dir(next))
1704                         break;
1705
1706                 if (mmc_req_rel_wr(next) &&
1707                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1708                         break;
1709
1710                 req_sectors += blk_rq_sectors(next);
1711                 if (req_sectors > max_blk_count)
1712                         break;
1713
1714                 phys_segments +=  next->nr_phys_segments;
1715                 if (phys_segments > max_phys_segs)
1716                         break;
1717
1718                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1719                 cur = next;
1720                 reqs++;
1721         } while (1);
1722
1723         if (put_back) {
1724                 spin_lock_irq(q->queue_lock);
1725                 blk_requeue_request(q, next);
1726                 spin_unlock_irq(q->queue_lock);
1727         }
1728
1729         if (reqs > 0) {
1730                 list_add(&req->queuelist, &mqrq->packed->list);
1731                 mqrq->packed->nr_entries = ++reqs;
1732                 mqrq->packed->retries = reqs;
1733                 return reqs;
1734         }
1735
1736 no_packed:
1737         mqrq->cmd_type = MMC_PACKED_NONE;
1738         return 0;
1739 }
1740
1741 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1742                                         struct mmc_card *card,
1743                                         struct mmc_queue *mq)
1744 {
1745         struct mmc_blk_request *brq = &mqrq->brq;
1746         struct request *req = mqrq->req;
1747         struct request *prq;
1748         struct mmc_blk_data *md = mq->data;
1749         struct mmc_packed *packed = mqrq->packed;
1750         bool do_rel_wr, do_data_tag;
1751         u32 *packed_cmd_hdr;
1752         u8 hdr_blocks;
1753         u8 i = 1;
1754
1755         BUG_ON(!packed);
1756
1757         mqrq->cmd_type = MMC_PACKED_WRITE;
1758         packed->blocks = 0;
1759         packed->idx_failure = MMC_PACKED_NR_IDX;
1760
1761         packed_cmd_hdr = packed->cmd_hdr;
1762         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1763         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1764                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1765         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1766
1767         /*
1768          * Argument for each entry of packed group
1769          */
1770         list_for_each_entry(prq, &packed->list, queuelist) {
1771                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1772                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1773                         (prq->cmd_flags & REQ_META) &&
1774                         (rq_data_dir(prq) == WRITE) &&
1775                         ((brq->data.blocks * brq->data.blksz) >=
1776                          card->ext_csd.data_tag_unit_size);
1777                 /* Argument of CMD23 */
1778                 packed_cmd_hdr[(i * 2)] =
1779                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1780                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1781                         blk_rq_sectors(prq);
1782                 /* Argument of CMD18 or CMD25 */
1783                 packed_cmd_hdr[((i * 2)) + 1] =
1784                         mmc_card_blockaddr(card) ?
1785                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1786                 packed->blocks += blk_rq_sectors(prq);
1787                 i++;
1788         }
1789
1790         memset(brq, 0, sizeof(struct mmc_blk_request));
1791         brq->mrq.cmd = &brq->cmd;
1792         brq->mrq.data = &brq->data;
1793         brq->mrq.sbc = &brq->sbc;
1794         brq->mrq.stop = &brq->stop;
1795
1796         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1797         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1798         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1799
1800         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1801         brq->cmd.arg = blk_rq_pos(req);
1802         if (!mmc_card_blockaddr(card))
1803                 brq->cmd.arg <<= 9;
1804         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1805
1806         brq->data.blksz = 512;
1807         brq->data.blocks = packed->blocks + hdr_blocks;
1808         brq->data.flags |= MMC_DATA_WRITE;
1809
1810         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1811         brq->stop.arg = 0;
1812         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1813
1814         mmc_set_data_timeout(&brq->data, card);
1815
1816         brq->data.sg = mqrq->sg;
1817         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1818
1819         mqrq->mmc_active.mrq = &brq->mrq;
1820         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1821
1822         mmc_queue_bounce_pre(mqrq);
1823 }
1824
1825 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1826                            struct mmc_blk_request *brq, struct request *req,
1827                            int ret)
1828 {
1829         struct mmc_queue_req *mq_rq;
1830         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1831
1832         /*
1833          * If this is an SD card and we're writing, we can first
1834          * mark the known good sectors as ok.
1835          *
1836          * If the card is not SD, we can still ok written sectors
1837          * as reported by the controller (which might be less than
1838          * the real number of written sectors, but never more).
1839          */
1840         if (mmc_card_sd(card)) {
1841                 u32 blocks;
1842
1843                 blocks = mmc_sd_num_wr_blocks(card);
1844                 if (blocks != (u32)-1) {
1845                         ret = blk_end_request(req, 0, blocks << 9);
1846                 }
1847         } else {
1848                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1849                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1850         }
1851         return ret;
1852 }
1853
1854 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1855 {
1856         struct request *prq;
1857         struct mmc_packed *packed = mq_rq->packed;
1858         int idx = packed->idx_failure, i = 0;
1859         int ret = 0;
1860
1861         BUG_ON(!packed);
1862
1863         while (!list_empty(&packed->list)) {
1864                 prq = list_entry_rq(packed->list.next);
1865                 if (idx == i) {
1866                         /* retry from error index */
1867                         packed->nr_entries -= idx;
1868                         mq_rq->req = prq;
1869                         ret = 1;
1870
1871                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1872                                 list_del_init(&prq->queuelist);
1873                                 mmc_blk_clear_packed(mq_rq);
1874                         }
1875                         return ret;
1876                 }
1877                 list_del_init(&prq->queuelist);
1878                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1879                 i++;
1880         }
1881
1882         mmc_blk_clear_packed(mq_rq);
1883         return ret;
1884 }
1885
1886 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1887 {
1888         struct request *prq;
1889         struct mmc_packed *packed = mq_rq->packed;
1890
1891         BUG_ON(!packed);
1892
1893         while (!list_empty(&packed->list)) {
1894                 prq = list_entry_rq(packed->list.next);
1895                 list_del_init(&prq->queuelist);
1896                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1897         }
1898
1899         mmc_blk_clear_packed(mq_rq);
1900 }
1901
1902 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1903                                       struct mmc_queue_req *mq_rq)
1904 {
1905         struct request *prq;
1906         struct request_queue *q = mq->queue;
1907         struct mmc_packed *packed = mq_rq->packed;
1908
1909         BUG_ON(!packed);
1910
1911         while (!list_empty(&packed->list)) {
1912                 prq = list_entry_rq(packed->list.prev);
1913                 if (prq->queuelist.prev != &packed->list) {
1914                         list_del_init(&prq->queuelist);
1915                         spin_lock_irq(q->queue_lock);
1916                         blk_requeue_request(mq->queue, prq);
1917                         spin_unlock_irq(q->queue_lock);
1918                 } else {
1919                         list_del_init(&prq->queuelist);
1920                 }
1921         }
1922
1923         mmc_blk_clear_packed(mq_rq);
1924 }
1925
1926 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1927 {
1928         struct mmc_blk_data *md = mq->data;
1929         struct mmc_card *card = md->queue.card;
1930         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1931         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1932         enum mmc_blk_status status;
1933         struct mmc_queue_req *mq_rq;
1934         struct request *req = rqc;
1935         struct mmc_async_req *areq;
1936         const u8 packed_nr = 2;
1937         u8 reqs = 0;
1938
1939         if (!rqc && !mq->mqrq_prev->req)
1940                 return 0;
1941
1942         if (rqc)
1943                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1944
1945         do {
1946                 if (rqc) {
1947                         /*
1948                          * When 4KB native sector is enabled, only 8 blocks
1949                          * multiple read or write is allowed
1950                          */
1951                         if ((brq->data.blocks & 0x07) &&
1952                             (card->ext_csd.data_sector_size == 4096)) {
1953                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1954                                         req->rq_disk->disk_name);
1955                                 mq_rq = mq->mqrq_cur;
1956                                 goto cmd_abort;
1957                         }
1958
1959                         if (reqs >= packed_nr)
1960                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1961                                                             card, mq);
1962                         else
1963                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1964                         areq = &mq->mqrq_cur->mmc_active;
1965                 } else
1966                         areq = NULL;
1967                 areq = mmc_start_req(card->host, areq, (int *) &status);
1968                 if (!areq) {
1969                         if (status == MMC_BLK_NEW_REQUEST)
1970                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1971                         return 0;
1972                 }
1973
1974                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1975                 brq = &mq_rq->brq;
1976                 req = mq_rq->req;
1977                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1978                 mmc_queue_bounce_post(mq_rq);
1979
1980                 switch (status) {
1981                 case MMC_BLK_SUCCESS:
1982                 case MMC_BLK_PARTIAL:
1983                         /*
1984                          * A block was successfully transferred.
1985                          */
1986                         mmc_blk_reset_success(md, type);
1987
1988                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1989                                 ret = mmc_blk_end_packed_req(mq_rq);
1990                                 break;
1991                         } else {
1992                                 ret = blk_end_request(req, 0,
1993                                                 brq->data.bytes_xfered);
1994                         }
1995
1996                         /*
1997                          * If the blk_end_request function returns non-zero even
1998                          * though all data has been transferred and no errors
1999                          * were returned by the host controller, it's a bug.
2000                          */
2001                         if (status == MMC_BLK_SUCCESS && ret) {
2002                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2003                                        __func__, blk_rq_bytes(req),
2004                                        brq->data.bytes_xfered);
2005                                 rqc = NULL;
2006                                 goto cmd_abort;
2007                         }
2008                         break;
2009                 case MMC_BLK_CMD_ERR:
2010                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2011                         if (mmc_blk_reset(md, card->host, type))
2012                                 goto cmd_abort;
2013                         if (!ret)
2014                                 goto start_new_req;
2015                         break;
2016                 case MMC_BLK_RETRY:
2017                         retune_retry_done = brq->retune_retry_done;
2018                         if (retry++ < 5)
2019                                 break;
2020                         /* Fall through */
2021                 case MMC_BLK_ABORT:
2022                         if (!mmc_blk_reset(md, card->host, type))
2023                                 break;
2024                         goto cmd_abort;
2025                 case MMC_BLK_DATA_ERR: {
2026                         int err;
2027
2028                         err = mmc_blk_reset(md, card->host, type);
2029                         if (!err)
2030                                 break;
2031                         if (err == -ENODEV ||
2032                                 mmc_packed_cmd(mq_rq->cmd_type))
2033                                 goto cmd_abort;
2034                         /* Fall through */
2035                 }
2036                 case MMC_BLK_ECC_ERR:
2037                         if (brq->data.blocks > 1) {
2038                                 /* Redo read one sector at a time */
2039                                 pr_warn("%s: retrying using single block read\n",
2040                                         req->rq_disk->disk_name);
2041                                 disable_multi = 1;
2042                                 break;
2043                         }
2044                         /*
2045                          * After an error, we redo I/O one sector at a
2046                          * time, so we only reach here after trying to
2047                          * read a single sector.
2048                          */
2049                         ret = blk_end_request(req, -EIO,
2050                                                 brq->data.blksz);
2051                         if (!ret)
2052                                 goto start_new_req;
2053                         break;
2054                 case MMC_BLK_NOMEDIUM:
2055                         goto cmd_abort;
2056                 default:
2057                         pr_err("%s: Unhandled return value (%d)",
2058                                         req->rq_disk->disk_name, status);
2059                         goto cmd_abort;
2060                 }
2061
2062                 if (ret) {
2063                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2064                                 if (!mq_rq->packed->retries)
2065                                         goto cmd_abort;
2066                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2067                                 mmc_start_req(card->host,
2068                                               &mq_rq->mmc_active, NULL);
2069                         } else {
2070
2071                                 /*
2072                                  * In case of a incomplete request
2073                                  * prepare it again and resend.
2074                                  */
2075                                 mmc_blk_rw_rq_prep(mq_rq, card,
2076                                                 disable_multi, mq);
2077                                 mmc_start_req(card->host,
2078                                                 &mq_rq->mmc_active, NULL);
2079                         }
2080                         mq_rq->brq.retune_retry_done = retune_retry_done;
2081                 }
2082         } while (ret);
2083
2084         return 1;
2085
2086  cmd_abort:
2087         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2088                 mmc_blk_abort_packed_req(mq_rq);
2089         } else {
2090                 if (mmc_card_removed(card))
2091                         req->cmd_flags |= REQ_QUIET;
2092                 while (ret)
2093                         ret = blk_end_request(req, -EIO,
2094                                         blk_rq_cur_bytes(req));
2095         }
2096
2097  start_new_req:
2098         if (rqc) {
2099                 if (mmc_card_removed(card)) {
2100                         rqc->cmd_flags |= REQ_QUIET;
2101                         blk_end_request_all(rqc, -EIO);
2102                 } else {
2103                         /*
2104                          * If current request is packed, it needs to put back.
2105                          */
2106                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2107                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2108
2109                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2110                         mmc_start_req(card->host,
2111                                       &mq->mqrq_cur->mmc_active, NULL);
2112                 }
2113         }
2114
2115         return 0;
2116 }
2117
2118 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2119 {
2120         int ret;
2121         struct mmc_blk_data *md = mq->data;
2122         struct mmc_card *card = md->queue.card;
2123         struct mmc_host *host = card->host;
2124         unsigned long flags;
2125         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2126
2127         if (req && !mq->mqrq_prev->req)
2128                 /* claim host only for the first request */
2129                 mmc_get_card(card);
2130
2131         ret = mmc_blk_part_switch(card, md);
2132         if (ret) {
2133                 if (req) {
2134                         blk_end_request_all(req, -EIO);
2135                 }
2136                 ret = 0;
2137                 goto out;
2138         }
2139
2140         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2141         if (cmd_flags & REQ_DISCARD) {
2142                 /* complete ongoing async transfer before issuing discard */
2143                 if (card->host->areq)
2144                         mmc_blk_issue_rw_rq(mq, NULL);
2145                 if (req->cmd_flags & REQ_SECURE)
2146                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2147                 else
2148                         ret = mmc_blk_issue_discard_rq(mq, req);
2149         } else if (cmd_flags & REQ_FLUSH) {
2150                 /* complete ongoing async transfer before issuing flush */
2151                 if (card->host->areq)
2152                         mmc_blk_issue_rw_rq(mq, NULL);
2153                 ret = mmc_blk_issue_flush(mq, req);
2154         } else {
2155                 if (!req && host->areq) {
2156                         spin_lock_irqsave(&host->context_info.lock, flags);
2157                         host->context_info.is_waiting_last_req = true;
2158                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2159                 }
2160                 ret = mmc_blk_issue_rw_rq(mq, req);
2161         }
2162
2163 out:
2164         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2165              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2166                 /*
2167                  * Release host when there are no more requests
2168                  * and after special request(discard, flush) is done.
2169                  * In case sepecial request, there is no reentry to
2170                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2171                  */
2172                 mmc_put_card(card);
2173         return ret;
2174 }
2175
2176 static inline int mmc_blk_readonly(struct mmc_card *card)
2177 {
2178         return mmc_card_readonly(card) ||
2179                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2180 }
2181
2182 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2183                                               struct device *parent,
2184                                               sector_t size,
2185                                               bool default_ro,
2186                                               const char *subname,
2187                                               int area_type)
2188 {
2189         struct mmc_blk_data *md;
2190         int devidx, ret;
2191
2192         devidx = find_first_zero_bit(dev_use, max_devices);
2193         if (devidx >= max_devices)
2194                 return ERR_PTR(-ENOSPC);
2195         __set_bit(devidx, dev_use);
2196
2197         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2198         if (!md) {
2199                 ret = -ENOMEM;
2200                 goto out;
2201         }
2202
2203         /*
2204          * !subname implies we are creating main mmc_blk_data that will be
2205          * associated with mmc_card with dev_set_drvdata. Due to device
2206          * partitions, devidx will not coincide with a per-physical card
2207          * index anymore so we keep track of a name index.
2208          */
2209         if (!subname) {
2210                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2211                 __set_bit(md->name_idx, name_use);
2212         } else
2213                 md->name_idx = ((struct mmc_blk_data *)
2214                                 dev_to_disk(parent)->private_data)->name_idx;
2215
2216         md->area_type = area_type;
2217
2218         /*
2219          * Set the read-only status based on the supported commands
2220          * and the write protect switch.
2221          */
2222         md->read_only = mmc_blk_readonly(card);
2223
2224         md->disk = alloc_disk(perdev_minors);
2225         if (md->disk == NULL) {
2226                 ret = -ENOMEM;
2227                 goto err_kfree;
2228         }
2229
2230         spin_lock_init(&md->lock);
2231         INIT_LIST_HEAD(&md->part);
2232         md->usage = 1;
2233
2234         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2235         if (ret)
2236                 goto err_putdisk;
2237
2238         md->queue.issue_fn = mmc_blk_issue_rq;
2239         md->queue.data = md;
2240
2241         md->disk->major = MMC_BLOCK_MAJOR;
2242         md->disk->first_minor = devidx * perdev_minors;
2243         md->disk->fops = &mmc_bdops;
2244         md->disk->private_data = md;
2245         md->disk->queue = md->queue.queue;
2246         md->disk->driverfs_dev = parent;
2247         set_disk_ro(md->disk, md->read_only || default_ro);
2248         md->disk->flags = GENHD_FL_EXT_DEVT;
2249         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2250                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2251
2252         /*
2253          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2254          *
2255          * - be set for removable media with permanent block devices
2256          * - be unset for removable block devices with permanent media
2257          *
2258          * Since MMC block devices clearly fall under the second
2259          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2260          * should use the block device creation/destruction hotplug
2261          * messages to tell when the card is present.
2262          */
2263
2264         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2265                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2266
2267         if (mmc_card_mmc(card))
2268                 blk_queue_logical_block_size(md->queue.queue,
2269                                              card->ext_csd.data_sector_size);
2270         else
2271                 blk_queue_logical_block_size(md->queue.queue, 512);
2272
2273         set_capacity(md->disk, size);
2274
2275         if (mmc_host_cmd23(card->host)) {
2276                 if (mmc_card_mmc(card) ||
2277                     (mmc_card_sd(card) &&
2278                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2279                         md->flags |= MMC_BLK_CMD23;
2280         }
2281
2282         if (mmc_card_mmc(card) &&
2283             md->flags & MMC_BLK_CMD23 &&
2284             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2285              card->ext_csd.rel_sectors)) {
2286                 md->flags |= MMC_BLK_REL_WR;
2287                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2288         }
2289
2290         if (mmc_card_mmc(card) &&
2291             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2292             (md->flags & MMC_BLK_CMD23) &&
2293             card->ext_csd.packed_event_en) {
2294                 if (!mmc_packed_init(&md->queue, card))
2295                         md->flags |= MMC_BLK_PACKED_CMD;
2296         }
2297
2298         return md;
2299
2300  err_putdisk:
2301         put_disk(md->disk);
2302  err_kfree:
2303         kfree(md);
2304  out:
2305         return ERR_PTR(ret);
2306 }
2307
2308 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2309 {
2310         sector_t size;
2311
2312         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2313                 /*
2314                  * The EXT_CSD sector count is in number or 512 byte
2315                  * sectors.
2316                  */
2317                 size = card->ext_csd.sectors;
2318         } else {
2319                 /*
2320                  * The CSD capacity field is in units of read_blkbits.
2321                  * set_capacity takes units of 512 bytes.
2322                  */
2323                 size = (typeof(sector_t))card->csd.capacity
2324                         << (card->csd.read_blkbits - 9);
2325         }
2326
2327         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2328                                         MMC_BLK_DATA_AREA_MAIN);
2329 }
2330
2331 static int mmc_blk_alloc_part(struct mmc_card *card,
2332                               struct mmc_blk_data *md,
2333                               unsigned int part_type,
2334                               sector_t size,
2335                               bool default_ro,
2336                               const char *subname,
2337                               int area_type)
2338 {
2339         char cap_str[10];
2340         struct mmc_blk_data *part_md;
2341
2342         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2343                                     subname, area_type);
2344         if (IS_ERR(part_md))
2345                 return PTR_ERR(part_md);
2346         part_md->part_type = part_type;
2347         list_add(&part_md->part, &md->part);
2348
2349         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2350                         cap_str, sizeof(cap_str));
2351         pr_info("%s: %s %s partition %u %s\n",
2352                part_md->disk->disk_name, mmc_card_id(card),
2353                mmc_card_name(card), part_md->part_type, cap_str);
2354         return 0;
2355 }
2356
2357 /* MMC Physical partitions consist of two boot partitions and
2358  * up to four general purpose partitions.
2359  * For each partition enabled in EXT_CSD a block device will be allocatedi
2360  * to provide access to the partition.
2361  */
2362
2363 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2364 {
2365         int idx, ret = 0;
2366
2367         if (!mmc_card_mmc(card))
2368                 return 0;
2369
2370         for (idx = 0; idx < card->nr_parts; idx++) {
2371                 if (card->part[idx].size) {
2372                         ret = mmc_blk_alloc_part(card, md,
2373                                 card->part[idx].part_cfg,
2374                                 card->part[idx].size >> 9,
2375                                 card->part[idx].force_ro,
2376                                 card->part[idx].name,
2377                                 card->part[idx].area_type);
2378                         if (ret)
2379                                 return ret;
2380                 }
2381         }
2382
2383         return ret;
2384 }
2385
2386 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2387 {
2388         struct mmc_card *card;
2389
2390         if (md) {
2391                 /*
2392                  * Flush remaining requests and free queues. It
2393                  * is freeing the queue that stops new requests
2394                  * from being accepted.
2395                  */
2396                 card = md->queue.card;
2397                 mmc_cleanup_queue(&md->queue);
2398                 if (md->flags & MMC_BLK_PACKED_CMD)
2399                         mmc_packed_clean(&md->queue);
2400                 if (md->disk->flags & GENHD_FL_UP) {
2401                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2402                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2403                                         card->ext_csd.boot_ro_lockable)
2404                                 device_remove_file(disk_to_dev(md->disk),
2405                                         &md->power_ro_lock);
2406
2407                         del_gendisk(md->disk);
2408                 }
2409                 mmc_blk_put(md);
2410         }
2411 }
2412
2413 static void mmc_blk_remove_parts(struct mmc_card *card,
2414                                  struct mmc_blk_data *md)
2415 {
2416         struct list_head *pos, *q;
2417         struct mmc_blk_data *part_md;
2418
2419         __clear_bit(md->name_idx, name_use);
2420         list_for_each_safe(pos, q, &md->part) {
2421                 part_md = list_entry(pos, struct mmc_blk_data, part);
2422                 list_del(pos);
2423                 mmc_blk_remove_req(part_md);
2424         }
2425 }
2426
2427 static int mmc_add_disk(struct mmc_blk_data *md)
2428 {
2429         int ret;
2430         struct mmc_card *card = md->queue.card;
2431
2432         add_disk(md->disk);
2433         md->force_ro.show = force_ro_show;
2434         md->force_ro.store = force_ro_store;
2435         sysfs_attr_init(&md->force_ro.attr);
2436         md->force_ro.attr.name = "force_ro";
2437         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2438         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2439         if (ret)
2440                 goto force_ro_fail;
2441
2442         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2443              card->ext_csd.boot_ro_lockable) {
2444                 umode_t mode;
2445
2446                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2447                         mode = S_IRUGO;
2448                 else
2449                         mode = S_IRUGO | S_IWUSR;
2450
2451                 md->power_ro_lock.show = power_ro_lock_show;
2452                 md->power_ro_lock.store = power_ro_lock_store;
2453                 sysfs_attr_init(&md->power_ro_lock.attr);
2454                 md->power_ro_lock.attr.mode = mode;
2455                 md->power_ro_lock.attr.name =
2456                                         "ro_lock_until_next_power_on";
2457                 ret = device_create_file(disk_to_dev(md->disk),
2458                                 &md->power_ro_lock);
2459                 if (ret)
2460                         goto power_ro_lock_fail;
2461         }
2462         return ret;
2463
2464 power_ro_lock_fail:
2465         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2466 force_ro_fail:
2467         del_gendisk(md->disk);
2468
2469         return ret;
2470 }
2471
2472 #define CID_MANFID_SANDISK      0x2
2473 #define CID_MANFID_TOSHIBA      0x11
2474 #define CID_MANFID_MICRON       0x13
2475 #define CID_MANFID_SAMSUNG      0x15
2476 #define CID_MANFID_KINGSTON     0x70
2477
2478 static const struct mmc_fixup blk_fixups[] =
2479 {
2480         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2481                   MMC_QUIRK_INAND_CMD38),
2482         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2483                   MMC_QUIRK_INAND_CMD38),
2484         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2485                   MMC_QUIRK_INAND_CMD38),
2486         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2487                   MMC_QUIRK_INAND_CMD38),
2488         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2489                   MMC_QUIRK_INAND_CMD38),
2490
2491         /*
2492          * Some MMC cards experience performance degradation with CMD23
2493          * instead of CMD12-bounded multiblock transfers. For now we'll
2494          * black list what's bad...
2495          * - Certain Toshiba cards.
2496          *
2497          * N.B. This doesn't affect SD cards.
2498          */
2499         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2500                   MMC_QUIRK_BLK_NO_CMD23),
2501         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2502                   MMC_QUIRK_BLK_NO_CMD23),
2503         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2504                   MMC_QUIRK_BLK_NO_CMD23),
2505         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2506                   MMC_QUIRK_BLK_NO_CMD23),
2507         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2508                   MMC_QUIRK_BLK_NO_CMD23),
2509
2510         /*
2511          * Some Micron MMC cards needs longer data read timeout than
2512          * indicated in CSD.
2513          */
2514         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2515                   MMC_QUIRK_LONG_READ_TIME),
2516
2517         /*
2518          * On these Samsung MoviNAND parts, performing secure erase or
2519          * secure trim can result in unrecoverable corruption due to a
2520          * firmware bug.
2521          */
2522         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2523                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2524         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2525                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2526         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2527                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2528         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2529                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2530         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2531                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2532         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2533                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2534         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2535                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2536         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2537                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2538
2539         /*
2540          *  On Some Kingston eMMCs, performing trim can result in
2541          *  unrecoverable data conrruption occasionally due to a firmware bug.
2542          */
2543         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2544                   MMC_QUIRK_TRIM_BROKEN),
2545         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2546                   MMC_QUIRK_TRIM_BROKEN),
2547
2548         END_FIXUP
2549 };
2550
2551 static int mmc_blk_probe(struct mmc_card *card)
2552 {
2553         struct mmc_blk_data *md, *part_md;
2554         char cap_str[10];
2555
2556         /*
2557          * Check that the card supports the command class(es) we need.
2558          */
2559         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2560                 return -ENODEV;
2561
2562         mmc_fixup_device(card, blk_fixups);
2563
2564         md = mmc_blk_alloc(card);
2565         if (IS_ERR(md))
2566                 return PTR_ERR(md);
2567
2568         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2569                         cap_str, sizeof(cap_str));
2570         pr_info("%s: %s %s %s %s\n",
2571                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2572                 cap_str, md->read_only ? "(ro)" : "");
2573
2574         if (mmc_blk_alloc_parts(card, md))
2575                 goto out;
2576
2577         dev_set_drvdata(&card->dev, md);
2578
2579         if (mmc_add_disk(md))
2580                 goto out;
2581
2582         list_for_each_entry(part_md, &md->part, part) {
2583                 if (mmc_add_disk(part_md))
2584                         goto out;
2585         }
2586
2587         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2588         pm_runtime_use_autosuspend(&card->dev);
2589
2590         /*
2591          * Don't enable runtime PM for SD-combo cards here. Leave that
2592          * decision to be taken during the SDIO init sequence instead.
2593          */
2594         if (card->type != MMC_TYPE_SD_COMBO) {
2595                 pm_runtime_set_active(&card->dev);
2596                 pm_runtime_enable(&card->dev);
2597         }
2598
2599         return 0;
2600
2601  out:
2602         mmc_blk_remove_parts(card, md);
2603         mmc_blk_remove_req(md);
2604         return 0;
2605 }
2606
2607 static void mmc_blk_remove(struct mmc_card *card)
2608 {
2609         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2610
2611         mmc_blk_remove_parts(card, md);
2612         pm_runtime_get_sync(&card->dev);
2613         mmc_claim_host(card->host);
2614         mmc_blk_part_switch(card, md);
2615         mmc_release_host(card->host);
2616         if (card->type != MMC_TYPE_SD_COMBO)
2617                 pm_runtime_disable(&card->dev);
2618         pm_runtime_put_noidle(&card->dev);
2619         mmc_blk_remove_req(md);
2620         dev_set_drvdata(&card->dev, NULL);
2621 }
2622
2623 static int _mmc_blk_suspend(struct mmc_card *card)
2624 {
2625         struct mmc_blk_data *part_md;
2626         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2627
2628         if (md) {
2629                 mmc_queue_suspend(&md->queue);
2630                 list_for_each_entry(part_md, &md->part, part) {
2631                         mmc_queue_suspend(&part_md->queue);
2632                 }
2633         }
2634         return 0;
2635 }
2636
2637 static void mmc_blk_shutdown(struct mmc_card *card)
2638 {
2639         _mmc_blk_suspend(card);
2640 }
2641
2642 #ifdef CONFIG_PM_SLEEP
2643 static int mmc_blk_suspend(struct device *dev)
2644 {
2645         struct mmc_card *card = mmc_dev_to_card(dev);
2646
2647         return _mmc_blk_suspend(card);
2648 }
2649
2650 static int mmc_blk_resume(struct device *dev)
2651 {
2652         struct mmc_blk_data *part_md;
2653         struct mmc_blk_data *md = dev_get_drvdata(dev);
2654
2655         if (md) {
2656                 /*
2657                  * Resume involves the card going into idle state,
2658                  * so current partition is always the main one.
2659                  */
2660                 md->part_curr = md->part_type;
2661                 mmc_queue_resume(&md->queue);
2662                 list_for_each_entry(part_md, &md->part, part) {
2663                         mmc_queue_resume(&part_md->queue);
2664                 }
2665         }
2666         return 0;
2667 }
2668 #endif
2669
2670 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2671
2672 static struct mmc_driver mmc_driver = {
2673         .drv            = {
2674                 .name   = "mmcblk",
2675                 .pm     = &mmc_blk_pm_ops,
2676         },
2677         .probe          = mmc_blk_probe,
2678         .remove         = mmc_blk_remove,
2679         .shutdown       = mmc_blk_shutdown,
2680 };
2681
2682 static int __init mmc_blk_init(void)
2683 {
2684         int res;
2685
2686         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2687                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2688
2689         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2690
2691         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2692         if (res)
2693                 goto out;
2694
2695         res = mmc_register_driver(&mmc_driver);
2696         if (res)
2697                 goto out2;
2698
2699         return 0;
2700  out2:
2701         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2702  out:
2703         return res;
2704 }
2705
2706 static void __exit mmc_blk_exit(void)
2707 {
2708         mmc_unregister_driver(&mmc_driver);
2709         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2710 }
2711
2712 module_init(mmc_blk_init);
2713 module_exit(mmc_blk_exit);
2714
2715 MODULE_LICENSE("GPL");
2716 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2717