drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50
  51 #ifdef KERNEL
  52 #ifdef MODULE_PARAM_PREFIX
  53 #undef MODULE_PARAM_PREFIX
  54 #endif
  55 #define MODULE_PARAM_PREFIX "mmcblk."
  56 #endif
  57
  58 #define INAND_CMD38_ARG_EXT_CSD  113
  59 #define INAND_CMD38_ARG_ERASE    0x00
  60 #define INAND_CMD38_ARG_TRIM     0x01
  61 #define INAND_CMD38_ARG_SECERASE 0x80
  62 #define INAND_CMD38_ARG_SECTRIM1 0x81
  63 #define INAND_CMD38_ARG_SECTRIM2 0x88
  64 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  65 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  66 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  67
  68 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
  69                                   (req->cmd_flags & REQ_META)) && \
  70                                   (rq_data_dir(req) == WRITE))
  71 #define PACKED_CMD_VER  0x01
  72 #define PACKED_CMD_WR   0x02
  73
  74 static DEFINE_MUTEX(block_mutex);
  75
  76 /*
  77  * The defaults come from config options but can be overriden by module
  78  * or bootarg options.
  79  */
  80 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  81
  82 /*
  83  * We've only got one major, so number of mmcblk devices is
  84  * limited to (1 << 20) / number of minors per device.  It is also
  85  * currently limited by the size of the static bitmaps below.
  86  */
  87 static int max_devices;
  88
  89 #define MAX_DEVICES 256
  90
  91 /* TODO: Replace these with struct ida */
  92 static DECLARE_BITMAP(dev_use, MAX_DEVICES);
  93 static DECLARE_BITMAP(name_use, MAX_DEVICES);
  94
  95 /*
  96  * There is one mmc_blk_data per slot.
  97  */
  98 struct mmc_blk_data {
  99         spinlock_t      lock;
 100         struct gendisk  *disk;
 101         struct mmc_queue queue;
 102         struct list_head part;
 103
 104         unsigned int    flags;
 105 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 106 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 107 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 108
 109         unsigned int    usage;
 110         unsigned int    read_only;
 111         unsigned int    part_type;
 112         unsigned int    name_idx;
 113         unsigned int    reset_done;
 114 #define MMC_BLK_READ            BIT(0)
 115 #define MMC_BLK_WRITE           BIT(1)
 116 #define MMC_BLK_DISCARD         BIT(2)
 117 #define MMC_BLK_SECDISCARD      BIT(3)
 118
 119         /*
 120          * Only set in main mmc_blk_data associated
 121          * with mmc_card with dev_set_drvdata, and keeps
 122          * track of the current selected device partition.
 123          */
 124         unsigned int    part_curr;
 125         struct device_attribute force_ro;
 126         struct device_attribute power_ro_lock;
 127         int     area_type;
 128 };
 129
 130 static DEFINE_MUTEX(open_lock);
 131
 132 enum {
 133         MMC_PACKED_NR_IDX = -1,
 134         MMC_PACKED_NR_ZERO,
 135         MMC_PACKED_NR_SINGLE,
 136 };
 137
 138 module_param(perdev_minors, int, 0444);
 139 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 140
 141 static inline int mmc_blk_part_switch(struct mmc_card *card,
 142                                       struct mmc_blk_data *md);
 143 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 144
 145 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 146 {
 147         struct mmc_packed *packed = mqrq->packed;
 148
 149         BUG_ON(!packed);
 150
 151         mqrq->cmd_type = MMC_PACKED_NONE;
 152         packed->nr_entries = MMC_PACKED_NR_ZERO;
 153         packed->idx_failure = MMC_PACKED_NR_IDX;
 154         packed->retries = 0;
 155         packed->blocks = 0;
 156 }
 157
 158 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 159 {
 160         struct mmc_blk_data *md;
 161
 162         mutex_lock(&open_lock);
 163         md = disk->private_data;
 164         if (md && md->usage == 0)
 165                 md = NULL;
 166         if (md)
 167                 md->usage++;
 168         mutex_unlock(&open_lock);
 169
 170         return md;
 171 }
 172
 173 static inline int mmc_get_devidx(struct gendisk *disk)
 174 {
 175         int devmaj = MAJOR(disk_devt(disk));
 176         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 177
 178         if (!devmaj)
 179                 devidx = disk->first_minor / perdev_minors;
 180         return devidx;
 181 }
 182
 183 static void mmc_blk_put(struct mmc_blk_data *md)
 184 {
 185         mutex_lock(&open_lock);
 186         md->usage--;
 187         if (md->usage == 0) {
 188                 int devidx = mmc_get_devidx(md->disk);
 189                 blk_cleanup_queue(md->queue.queue);
 190
 191                 __clear_bit(devidx, dev_use);
 192
 193                 put_disk(md->disk);
 194                 kfree(md);
 195         }
 196         mutex_unlock(&open_lock);
 197 }
 198
 199 static ssize_t power_ro_lock_show(struct device *dev,
 200                 struct device_attribute *attr, char *buf)
 201 {
 202         int ret;
 203         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 204         struct mmc_card *card = md->queue.card;
 205         int locked = 0;
 206
 207         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 208                 locked = 2;
 209         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 210                 locked = 1;
 211
 212         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 213
 214         mmc_blk_put(md);
 215
 216         return ret;
 217 }
 218
 219 static ssize_t power_ro_lock_store(struct device *dev,
 220                 struct device_attribute *attr, const char *buf, size_t count)
 221 {
 222         int ret;
 223         struct mmc_blk_data *md, *part_md;
 224         struct mmc_card *card;
 225         unsigned long set;
 226
 227         if (kstrtoul(buf, 0, &set))
 228                 return -EINVAL;
 229
 230         if (set != 1)
 231                 return count;
 232
 233         md = mmc_blk_get(dev_to_disk(dev));
 234         card = md->queue.card;
 235
 236         mmc_get_card(card);
 237
 238         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 239                                 card->ext_csd.boot_ro_lock |
 240                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 241                                 card->ext_csd.part_time);
 242         if (ret)
 243                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 244         else
 245                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 246
 247         mmc_put_card(card);
 248
 249         if (!ret) {
 250                 pr_info("%s: Locking boot partition ro until next power on\n",
 251                         md->disk->disk_name);
 252                 set_disk_ro(md->disk, 1);
 253
 254                 list_for_each_entry(part_md, &md->part, part)
 255                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 256                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 257                                 set_disk_ro(part_md->disk, 1);
 258                         }
 259         }
 260
 261         mmc_blk_put(md);
 262         return count;
 263 }
 264
 265 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 266                              char *buf)
 267 {
 268         int ret;
 269         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 270
 271         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 272                        get_disk_ro(dev_to_disk(dev)) ^
 273                        md->read_only);
 274         mmc_blk_put(md);
 275         return ret;
 276 }
 277
 278 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 279                               const char *buf, size_t count)
 280 {
 281         int ret;
 282         char *end;
 283         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 284         unsigned long set = simple_strtoul(buf, &end, 0);
 285         if (end == buf) {
 286                 ret = -EINVAL;
 287                 goto out;
 288         }
 289
 290         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 291         ret = count;
 292 out:
 293         mmc_blk_put(md);
 294         return ret;
 295 }
 296
 297 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 298 {
 299         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 300         int ret = -ENXIO;
 301
 302         mutex_lock(&block_mutex);
 303         if (md) {
 304                 if (md->usage == 2)
 305                         check_disk_change(bdev);
 306                 ret = 0;
 307
 308                 if ((mode & FMODE_WRITE) && md->read_only) {
 309                         mmc_blk_put(md);
 310                         ret = -EROFS;
 311                 }
 312         }
 313         mutex_unlock(&block_mutex);
 314
 315         return ret;
 316 }
 317
 318 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 319 {
 320         struct mmc_blk_data *md = disk->private_data;
 321
 322         mutex_lock(&block_mutex);
 323         mmc_blk_put(md);
 324         mutex_unlock(&block_mutex);
 325 }
 326
 327 static int
 328 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 329 {
 330         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 331         geo->heads = 4;
 332         geo->sectors = 16;
 333         return 0;
 334 }
 335
 336 struct mmc_blk_ioc_data {
 337         struct mmc_ioc_cmd ic;
 338         unsigned char *buf;
 339         u64 buf_bytes;
 340 };
 341
 342 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 343         struct mmc_ioc_cmd __user *user)
 344 {
 345         struct mmc_blk_ioc_data *idata;
 346         int err;
 347
 348         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 349         if (!idata) {
 350                 err = -ENOMEM;
 351                 goto out;
 352         }
 353
 354         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 355                 err = -EFAULT;
 356                 goto idata_err;
 357         }
 358
 359         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 360         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 361                 err = -EOVERFLOW;
 362                 goto idata_err;
 363         }
 364
 365         if (!idata->buf_bytes)
 366                 return idata;
 367
 368         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 369         if (!idata->buf) {
 370                 err = -ENOMEM;
 371                 goto idata_err;
 372         }
 373
 374         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 375                                         idata->ic.data_ptr, idata->buf_bytes)) {
 376                 err = -EFAULT;
 377                 goto copy_err;
 378         }
 379
 380         return idata;
 381
 382 copy_err:
 383         kfree(idata->buf);
 384 idata_err:
 385         kfree(idata);
 386 out:
 387         return ERR_PTR(err);
 388 }
 389
 390 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 391                                       struct mmc_blk_ioc_data *idata)
 392 {
 393         struct mmc_ioc_cmd *ic = &idata->ic;
 394
 395         if (copy_to_user(&(ic_ptr->response), ic->response,
 396                          sizeof(ic->response)))
 397                 return -EFAULT;
 398
 399         if (!idata->ic.write_flag) {
 400                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 401                                  idata->buf, idata->buf_bytes))
 402                         return -EFAULT;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 409                                        u32 retries_max)
 410 {
 411         int err;
 412         u32 retry_count = 0;
 413
 414         if (!status || !retries_max)
 415                 return -EINVAL;
 416
 417         do {
 418                 err = get_card_status(card, status, 5);
 419                 if (err)
 420                         break;
 421
 422                 if (!R1_STATUS(*status) &&
 423                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 424                         break; /* RPMB programming operation complete */
 425
 426                 /*
 427                  * Rechedule to give the MMC device a chance to continue
 428                  * processing the previous command without being polled too
 429                  * frequently.
 430                  */
 431                 usleep_range(1000, 5000);
 432         } while (++retry_count < retries_max);
 433
 434         if (retry_count == retries_max)
 435                 err = -EPERM;
 436
 437         return err;
 438 }
 439
 440 static int ioctl_do_sanitize(struct mmc_card *card)
 441 {
 442         int err;
 443
 444         if (!mmc_can_sanitize(card)) {
 445                         pr_warn("%s: %s - SANITIZE is not supported\n",
 446                                 mmc_hostname(card->host), __func__);
 447                         err = -EOPNOTSUPP;
 448                         goto out;
 449         }
 450
 451         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 452                 mmc_hostname(card->host), __func__);
 453
 454         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 455                                         EXT_CSD_SANITIZE_START, 1,
 456                                         MMC_SANITIZE_REQ_TIMEOUT);
 457
 458         if (err)
 459                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 460                        mmc_hostname(card->host), __func__, err);
 461
 462         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 463                                              __func__);
 464 out:
 465         return err;
 466 }
 467
 468 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 469                                struct mmc_blk_ioc_data *idata)
 470 {
 471         struct mmc_command cmd = {0};
 472         struct mmc_data data = {0};
 473         struct mmc_request mrq = {NULL};
 474         struct scatterlist sg;
 475         int err;
 476         int is_rpmb = false;
 477         u32 status = 0;
 478
 479         if (!card || !md || !idata)
 480                 return -EINVAL;
 481
 482         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 483                 is_rpmb = true;
 484
 485         cmd.opcode = idata->ic.opcode;
 486         cmd.arg = idata->ic.arg;
 487         cmd.flags = idata->ic.flags;
 488
 489         if (idata->buf_bytes) {
 490                 data.sg = &sg;
 491                 data.sg_len = 1;
 492                 data.blksz = idata->ic.blksz;
 493                 data.blocks = idata->ic.blocks;
 494
 495                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 496
 497                 if (idata->ic.write_flag)
 498                         data.flags = MMC_DATA_WRITE;
 499                 else
 500                         data.flags = MMC_DATA_READ;
 501
 502                 /* data.flags must already be set before doing this. */
 503                 mmc_set_data_timeout(&data, card);
 504
 505                 /* Allow overriding the timeout_ns for empirical tuning. */
 506                 if (idata->ic.data_timeout_ns)
 507                         data.timeout_ns = idata->ic.data_timeout_ns;
 508
 509                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 510                         /*
 511                          * Pretend this is a data transfer and rely on the
 512                          * host driver to compute timeout.  When all host
 513                          * drivers support cmd.cmd_timeout for R1B, this
 514                          * can be changed to:
 515                          *
 516                          *     mrq.data = NULL;
 517                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 518                          */
 519                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 520                 }
 521
 522                 mrq.data = &data;
 523         }
 524
 525         mrq.cmd = &cmd;
 526
 527         err = mmc_blk_part_switch(card, md);
 528         if (err)
 529                 return err;
 530
 531         if (idata->ic.is_acmd) {
 532                 err = mmc_app_cmd(card->host, card);
 533                 if (err)
 534                         return err;
 535         }
 536
 537         if (is_rpmb) {
 538                 err = mmc_set_blockcount(card, data.blocks,
 539                         idata->ic.write_flag & (1 << 31));
 540                 if (err)
 541                         return err;
 542         }
 543
 544         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 545             (cmd.opcode == MMC_SWITCH)) {
 546                 err = ioctl_do_sanitize(card);
 547
 548                 if (err)
 549                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 550                                __func__, err);
 551
 552                 return err;
 553         }
 554
 555         mmc_wait_for_req(card->host, &mrq);
 556
 557         if (cmd.error) {
 558                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 559                                                 __func__, cmd.error);
 560                 return cmd.error;
 561         }
 562         if (data.error) {
 563                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 564                                                 __func__, data.error);
 565                 return data.error;
 566         }
 567
 568         /*
 569          * According to the SD specs, some commands require a delay after
 570          * issuing the command.
 571          */
 572         if (idata->ic.postsleep_min_us)
 573                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 574
 575         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 576
 577         if (is_rpmb) {
 578                 /*
 579                  * Ensure RPMB command has completed by polling CMD13
 580                  * "Send Status".
 581                  */
 582                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 583                 if (err)
 584                         dev_err(mmc_dev(card->host),
 585                                         "%s: Card Status=0x%08X, error %d\n",
 586                                         __func__, status, err);
 587         }
 588
 589         return err;
 590 }
 591
 592 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 593                              struct mmc_ioc_cmd __user *ic_ptr)
 594 {
 595         struct mmc_blk_ioc_data *idata;
 596         struct mmc_blk_data *md;
 597         struct mmc_card *card;
 598         int err = 0, ioc_err = 0;
 599
 600         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 601         if (IS_ERR(idata))
 602                 return PTR_ERR(idata);
 603
 604         md = mmc_blk_get(bdev->bd_disk);
 605         if (!md) {
 606                 err = -EINVAL;
 607                 goto cmd_err;
 608         }
 609
 610         card = md->queue.card;
 611         if (IS_ERR(card)) {
 612                 err = PTR_ERR(card);
 613                 goto cmd_done;
 614         }
 615
 616         mmc_get_card(card);
 617
 618         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 619
 620         mmc_put_card(card);
 621
 622         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 623
 624 cmd_done:
 625         mmc_blk_put(md);
 626 cmd_err:
 627         kfree(idata->buf);
 628         kfree(idata);
 629         return ioc_err ? ioc_err : err;
 630 }
 631
 632 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 633                                    struct mmc_ioc_multi_cmd __user *user)
 634 {
 635         struct mmc_blk_ioc_data **idata = NULL;
 636         struct mmc_ioc_cmd __user *cmds = user->cmds;
 637         struct mmc_card *card;
 638         struct mmc_blk_data *md;
 639         int i, err = 0, ioc_err = 0;
 640         __u64 num_of_cmds;
 641
 642         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 643                            sizeof(num_of_cmds)))
 644                 return -EFAULT;
 645
 646         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 647                 return -EINVAL;
 648
 649         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 650         if (!idata)
 651                 return -ENOMEM;
 652
 653         for (i = 0; i < num_of_cmds; i++) {
 654                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 655                 if (IS_ERR(idata[i])) {
 656                         err = PTR_ERR(idata[i]);
 657                         num_of_cmds = i;
 658                         goto cmd_err;
 659                 }
 660         }
 661
 662         md = mmc_blk_get(bdev->bd_disk);
 663         if (!md)
 664                 goto cmd_err;
 665
 666         card = md->queue.card;
 667         if (IS_ERR(card)) {
 668                 err = PTR_ERR(card);
 669                 goto cmd_done;
 670         }
 671
 672         mmc_get_card(card);
 673
 674         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 675                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 676
 677         mmc_put_card(card);
 678
 679         /* copy to user if data and response */
 680         for (i = 0; i < num_of_cmds && !err; i++)
 681                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 682
 683 cmd_done:
 684         mmc_blk_put(md);
 685 cmd_err:
 686         for (i = 0; i < num_of_cmds; i++) {
 687                 kfree(idata[i]->buf);
 688                 kfree(idata[i]);
 689         }
 690         kfree(idata);
 691         return ioc_err ? ioc_err : err;
 692 }
 693
 694 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 695         unsigned int cmd, unsigned long arg)
 696 {
 697         /*
 698          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 699          * whole block device, not on a partition.  This prevents overspray
 700          * between sibling partitions.
 701          */
 702         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 703                 return -EPERM;
 704
 705         switch (cmd) {
 706         case MMC_IOC_CMD:
 707                 return mmc_blk_ioctl_cmd(bdev,
 708                                 (struct mmc_ioc_cmd __user *)arg);
 709         case MMC_IOC_MULTI_CMD:
 710                 return mmc_blk_ioctl_multi_cmd(bdev,
 711                                 (struct mmc_ioc_multi_cmd __user *)arg);
 712         default:
 713                 return -EINVAL;
 714         }
 715 }
 716
 717 #ifdef CONFIG_COMPAT
 718 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 719         unsigned int cmd, unsigned long arg)
 720 {
 721         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 722 }
 723 #endif
 724
 725 static const struct block_device_operations mmc_bdops = {
 726         .open                   = mmc_blk_open,
 727         .release                = mmc_blk_release,
 728         .getgeo                 = mmc_blk_getgeo,
 729         .owner                  = THIS_MODULE,
 730         .ioctl                  = mmc_blk_ioctl,
 731 #ifdef CONFIG_COMPAT
 732         .compat_ioctl           = mmc_blk_compat_ioctl,
 733 #endif
 734 };
 735
 736 static inline int mmc_blk_part_switch(struct mmc_card *card,
 737                                       struct mmc_blk_data *md)
 738 {
 739         int ret;
 740         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 741
 742         if (main_md->part_curr == md->part_type)
 743                 return 0;
 744
 745         if (mmc_card_mmc(card)) {
 746                 u8 part_config = card->ext_csd.part_config;
 747
 748                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 749                 part_config |= md->part_type;
 750
 751                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 752                                  EXT_CSD_PART_CONFIG, part_config,
 753                                  card->ext_csd.part_time);
 754                 if (ret)
 755                         return ret;
 756
 757                 card->ext_csd.part_config = part_config;
 758         }
 759
 760         main_md->part_curr = md->part_type;
 761         return 0;
 762 }
 763
 764 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 765 {
 766         int err;
 767         u32 result;
 768         __be32 *blocks;
 769
 770         struct mmc_request mrq = {NULL};
 771         struct mmc_command cmd = {0};
 772         struct mmc_data data = {0};
 773
 774         struct scatterlist sg;
 775
 776         cmd.opcode = MMC_APP_CMD;
 777         cmd.arg = card->rca << 16;
 778         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 779
 780         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 781         if (err)
 782                 return (u32)-1;
 783         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 784                 return (u32)-1;
 785
 786         memset(&cmd, 0, sizeof(struct mmc_command));
 787
 788         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 789         cmd.arg = 0;
 790         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 791
 792         data.blksz = 4;
 793         data.blocks = 1;
 794         data.flags = MMC_DATA_READ;
 795         data.sg = &sg;
 796         data.sg_len = 1;
 797         mmc_set_data_timeout(&data, card);
 798
 799         mrq.cmd = &cmd;
 800         mrq.data = &data;
 801
 802         blocks = kmalloc(4, GFP_KERNEL);
 803         if (!blocks)
 804                 return (u32)-1;
 805
 806         sg_init_one(&sg, blocks, 4);
 807
 808         mmc_wait_for_req(card->host, &mrq);
 809
 810         result = ntohl(*blocks);
 811         kfree(blocks);
 812
 813         if (cmd.error || data.error)
 814                 result = (u32)-1;
 815
 816         return result;
 817 }
 818
 819 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 820 {
 821         struct mmc_command cmd = {0};
 822         int err;
 823
 824         cmd.opcode = MMC_SEND_STATUS;
 825         if (!mmc_host_is_spi(card->host))
 826                 cmd.arg = card->rca << 16;
 827         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 828         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 829         if (err == 0)
 830                 *status = cmd.resp[0];
 831         return err;
 832 }
 833
 834 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 835                 bool hw_busy_detect, struct request *req, int *gen_err)
 836 {
 837         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 838         int err = 0;
 839         u32 status;
 840
 841         do {
 842                 err = get_card_status(card, &status, 5);
 843                 if (err) {
 844                         pr_err("%s: error %d requesting status\n",
 845                                req->rq_disk->disk_name, err);
 846                         return err;
 847                 }
 848
 849                 if (status & R1_ERROR) {
 850                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 851                                 req->rq_disk->disk_name, __func__, status);
 852                         *gen_err = 1;
 853                 }
 854
 855                 /* We may rely on the host hw to handle busy detection.*/
 856                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 857                         hw_busy_detect)
 858                         break;
 859
 860                 /*
 861                  * Timeout if the device never becomes ready for data and never
 862                  * leaves the program state.
 863                  */
 864                 if (time_after(jiffies, timeout)) {
 865                         pr_err("%s: Card stuck in programming state! %s %s\n",
 866                                 mmc_hostname(card->host),
 867                                 req->rq_disk->disk_name, __func__);
 868                         return -ETIMEDOUT;
 869                 }
 870
 871                 /*
 872                  * Some cards mishandle the status bits,
 873                  * so make sure to check both the busy
 874                  * indication and the card state.
 875                  */
 876         } while (!(status & R1_READY_FOR_DATA) ||
 877                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 878
 879         return err;
 880 }
 881
 882 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 883                 struct request *req, int *gen_err, u32 *stop_status)
 884 {
 885         struct mmc_host *host = card->host;
 886         struct mmc_command cmd = {0};
 887         int err;
 888         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 889
 890         /*
 891          * Normally we use R1B responses for WRITE, but in cases where the host
 892          * has specified a max_busy_timeout we need to validate it. A failure
 893          * means we need to prevent the host from doing hw busy detection, which
 894          * is done by converting to a R1 response instead.
 895          */
 896         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 897                 use_r1b_resp = false;
 898
 899         cmd.opcode = MMC_STOP_TRANSMISSION;
 900         if (use_r1b_resp) {
 901                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 902                 cmd.busy_timeout = timeout_ms;
 903         } else {
 904                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 905         }
 906
 907         err = mmc_wait_for_cmd(host, &cmd, 5);
 908         if (err)
 909                 return err;
 910
 911         *stop_status = cmd.resp[0];
 912
 913         /* No need to check card status in case of READ. */
 914         if (rq_data_dir(req) == READ)
 915                 return 0;
 916
 917         if (!mmc_host_is_spi(host) &&
 918                 (*stop_status & R1_ERROR)) {
 919                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 920                         req->rq_disk->disk_name, __func__, *stop_status);
 921                 *gen_err = 1;
 922         }
 923
 924         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 925 }
 926
 927 #define ERR_NOMEDIUM    3
 928 #define ERR_RETRY       2
 929 #define ERR_ABORT       1
 930 #define ERR_CONTINUE    0
 931
 932 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 933         bool status_valid, u32 status)
 934 {
 935         switch (error) {
 936         case -EILSEQ:
 937                 /* response crc error, retry the r/w cmd */
 938                 pr_err("%s: %s sending %s command, card status %#x\n",
 939                         req->rq_disk->disk_name, "response CRC error",
 940                         name, status);
 941                 return ERR_RETRY;
 942
 943         case -ETIMEDOUT:
 944                 pr_err("%s: %s sending %s command, card status %#x\n",
 945                         req->rq_disk->disk_name, "timed out", name, status);
 946
 947                 /* If the status cmd initially failed, retry the r/w cmd */
 948                 if (!status_valid)
 949                         return ERR_RETRY;
 950
 951                 /*
 952                  * If it was a r/w cmd crc error, or illegal command
 953                  * (eg, issued in wrong state) then retry - we should
 954                  * have corrected the state problem above.
 955                  */
 956                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 957                         return ERR_RETRY;
 958
 959                 /* Otherwise abort the command */
 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          * REQ_META accesses, and are supported only on MMCs.
1471          *
1472          * XXX: this really needs a good explanation of why REQ_META
1473          * is treated special.
1474          */
1475         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1476                           (req->cmd_flags & REQ_META)) &&
1477                 (rq_data_dir(req) == WRITE) &&
1478                 (md->flags & MMC_BLK_REL_WR);
1479
1480         memset(brq, 0, sizeof(struct mmc_blk_request));
1481         brq->mrq.cmd = &brq->cmd;
1482         brq->mrq.data = &brq->data;
1483
1484         brq->cmd.arg = blk_rq_pos(req);
1485         if (!mmc_card_blockaddr(card))
1486                 brq->cmd.arg <<= 9;
1487         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1488         brq->data.blksz = 512;
1489         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1490         brq->stop.arg = 0;
1491         brq->data.blocks = blk_rq_sectors(req);
1492
1493         /*
1494          * The block layer doesn't support all sector count
1495          * restrictions, so we need to be prepared for too big
1496          * requests.
1497          */
1498         if (brq->data.blocks > card->host->max_blk_count)
1499                 brq->data.blocks = card->host->max_blk_count;
1500
1501         if (brq->data.blocks > 1) {
1502                 /*
1503                  * After a read error, we redo the request one sector
1504                  * at a time in order to accurately determine which
1505                  * sectors can be read successfully.
1506                  */
1507                 if (disable_multi)
1508                         brq->data.blocks = 1;
1509
1510                 /*
1511                  * Some controllers have HW issues while operating
1512                  * in multiple I/O mode
1513                  */
1514                 if (card->host->ops->multi_io_quirk)
1515                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1516                                                 (rq_data_dir(req) == READ) ?
1517                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1518                                                 brq->data.blocks);
1519         }
1520
1521         if (brq->data.blocks > 1 || do_rel_wr) {
1522                 /* SPI multiblock writes terminate using a special
1523                  * token, not a STOP_TRANSMISSION request.
1524                  */
1525                 if (!mmc_host_is_spi(card->host) ||
1526                     rq_data_dir(req) == READ)
1527                         brq->mrq.stop = &brq->stop;
1528                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1529                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1530         } else {
1531                 brq->mrq.stop = NULL;
1532                 readcmd = MMC_READ_SINGLE_BLOCK;
1533                 writecmd = MMC_WRITE_BLOCK;
1534         }
1535         if (rq_data_dir(req) == READ) {
1536                 brq->cmd.opcode = readcmd;
1537                 brq->data.flags |= MMC_DATA_READ;
1538                 if (brq->mrq.stop)
1539                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1540                                         MMC_CMD_AC;
1541         } else {
1542                 brq->cmd.opcode = writecmd;
1543                 brq->data.flags |= MMC_DATA_WRITE;
1544                 if (brq->mrq.stop)
1545                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1546                                         MMC_CMD_AC;
1547         }
1548
1549         if (do_rel_wr)
1550                 mmc_apply_rel_rw(brq, card, req);
1551
1552         /*
1553          * Data tag is used only during writing meta data to speed
1554          * up write and any subsequent read of this meta data
1555          */
1556         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1557                 (req->cmd_flags & REQ_META) &&
1558                 (rq_data_dir(req) == WRITE) &&
1559                 ((brq->data.blocks * brq->data.blksz) >=
1560                  card->ext_csd.data_tag_unit_size);
1561
1562         /*
1563          * Pre-defined multi-block transfers are preferable to
1564          * open ended-ones (and necessary for reliable writes).
1565          * However, it is not sufficient to just send CMD23,
1566          * and avoid the final CMD12, as on an error condition
1567          * CMD12 (stop) needs to be sent anyway. This, coupled
1568          * with Auto-CMD23 enhancements provided by some
1569          * hosts, means that the complexity of dealing
1570          * with this is best left to the host. If CMD23 is
1571          * supported by card and host, we'll fill sbc in and let
1572          * the host deal with handling it correctly. This means
1573          * that for hosts that don't expose MMC_CAP_CMD23, no
1574          * change of behavior will be observed.
1575          *
1576          * N.B: Some MMC cards experience perf degradation.
1577          * We'll avoid using CMD23-bounded multiblock writes for
1578          * these, while retaining features like reliable writes.
1579          */
1580         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1581             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1582              do_data_tag)) {
1583                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1584                 brq->sbc.arg = brq->data.blocks |
1585                         (do_rel_wr ? (1 << 31) : 0) |
1586                         (do_data_tag ? (1 << 29) : 0);
1587                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1588                 brq->mrq.sbc = &brq->sbc;
1589         }
1590
1591         mmc_set_data_timeout(&brq->data, card);
1592
1593         brq->data.sg = mqrq->sg;
1594         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1595
1596         /*
1597          * Adjust the sg list so it is the same size as the
1598          * request.
1599          */
1600         if (brq->data.blocks != blk_rq_sectors(req)) {
1601                 int i, data_size = brq->data.blocks << 9;
1602                 struct scatterlist *sg;
1603
1604                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1605                         data_size -= sg->length;
1606                         if (data_size <= 0) {
1607                                 sg->length += data_size;
1608                                 i++;
1609                                 break;
1610                         }
1611                 }
1612                 brq->data.sg_len = i;
1613         }
1614
1615         mqrq->mmc_active.mrq = &brq->mrq;
1616         mqrq->mmc_active.err_check = mmc_blk_err_check;
1617
1618         mmc_queue_bounce_pre(mqrq);
1619 }
1620
1621 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1622                                           struct mmc_card *card)
1623 {
1624         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1625         unsigned int max_seg_sz = queue_max_segment_size(q);
1626         unsigned int len, nr_segs = 0;
1627
1628         do {
1629                 len = min(hdr_sz, max_seg_sz);
1630                 hdr_sz -= len;
1631                 nr_segs++;
1632         } while (hdr_sz);
1633
1634         return nr_segs;
1635 }
1636
1637 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1638 {
1639         struct request_queue *q = mq->queue;
1640         struct mmc_card *card = mq->card;
1641         struct request *cur = req, *next = NULL;
1642         struct mmc_blk_data *md = mq->data;
1643         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1644         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1645         unsigned int req_sectors = 0, phys_segments = 0;
1646         unsigned int max_blk_count, max_phys_segs;
1647         bool put_back = true;
1648         u8 max_packed_rw = 0;
1649         u8 reqs = 0;
1650
1651         if (!(md->flags & MMC_BLK_PACKED_CMD))
1652                 goto no_packed;
1653
1654         if ((rq_data_dir(cur) == WRITE) &&
1655             mmc_host_packed_wr(card->host))
1656                 max_packed_rw = card->ext_csd.max_packed_writes;
1657
1658         if (max_packed_rw == 0)
1659                 goto no_packed;
1660
1661         if (mmc_req_rel_wr(cur) &&
1662             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1663                 goto no_packed;
1664
1665         if (mmc_large_sector(card) &&
1666             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1667                 goto no_packed;
1668
1669         mmc_blk_clear_packed(mqrq);
1670
1671         max_blk_count = min(card->host->max_blk_count,
1672                             card->host->max_req_size >> 9);
1673         if (unlikely(max_blk_count > 0xffff))
1674                 max_blk_count = 0xffff;
1675
1676         max_phys_segs = queue_max_segments(q);
1677         req_sectors += blk_rq_sectors(cur);
1678         phys_segments += cur->nr_phys_segments;
1679
1680         if (rq_data_dir(cur) == WRITE) {
1681                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1682                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1683         }
1684
1685         do {
1686                 if (reqs >= max_packed_rw - 1) {
1687                         put_back = false;
1688                         break;
1689                 }
1690
1691                 spin_lock_irq(q->queue_lock);
1692                 next = blk_fetch_request(q);
1693                 spin_unlock_irq(q->queue_lock);
1694                 if (!next) {
1695                         put_back = false;
1696                         break;
1697                 }
1698
1699                 if (mmc_large_sector(card) &&
1700                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1701                         break;
1702
1703                 if (next->cmd_flags & REQ_DISCARD ||
1704                     next->cmd_flags & REQ_FLUSH)
1705                         break;
1706
1707                 if (rq_data_dir(cur) != rq_data_dir(next))
1708                         break;
1709
1710                 if (mmc_req_rel_wr(next) &&
1711                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1712                         break;
1713
1714                 req_sectors += blk_rq_sectors(next);
1715                 if (req_sectors > max_blk_count)
1716                         break;
1717
1718                 phys_segments +=  next->nr_phys_segments;
1719                 if (phys_segments > max_phys_segs)
1720                         break;
1721
1722                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1723                 cur = next;
1724                 reqs++;
1725         } while (1);
1726
1727         if (put_back) {
1728                 spin_lock_irq(q->queue_lock);
1729                 blk_requeue_request(q, next);
1730                 spin_unlock_irq(q->queue_lock);
1731         }
1732
1733         if (reqs > 0) {
1734                 list_add(&req->queuelist, &mqrq->packed->list);
1735                 mqrq->packed->nr_entries = ++reqs;
1736                 mqrq->packed->retries = reqs;
1737                 return reqs;
1738         }
1739
1740 no_packed:
1741         mqrq->cmd_type = MMC_PACKED_NONE;
1742         return 0;
1743 }
1744
1745 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1746                                         struct mmc_card *card,
1747                                         struct mmc_queue *mq)
1748 {
1749         struct mmc_blk_request *brq = &mqrq->brq;
1750         struct request *req = mqrq->req;
1751         struct request *prq;
1752         struct mmc_blk_data *md = mq->data;
1753         struct mmc_packed *packed = mqrq->packed;
1754         bool do_rel_wr, do_data_tag;
1755         u32 *packed_cmd_hdr;
1756         u8 hdr_blocks;
1757         u8 i = 1;
1758
1759         BUG_ON(!packed);
1760
1761         mqrq->cmd_type = MMC_PACKED_WRITE;
1762         packed->blocks = 0;
1763         packed->idx_failure = MMC_PACKED_NR_IDX;
1764
1765         packed_cmd_hdr = packed->cmd_hdr;
1766         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1767         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1768                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1769         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1770
1771         /*
1772          * Argument for each entry of packed group
1773          */
1774         list_for_each_entry(prq, &packed->list, queuelist) {
1775                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1776                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1777                         (prq->cmd_flags & REQ_META) &&
1778                         (rq_data_dir(prq) == WRITE) &&
1779                         ((brq->data.blocks * brq->data.blksz) >=
1780                          card->ext_csd.data_tag_unit_size);
1781                 /* Argument of CMD23 */
1782                 packed_cmd_hdr[(i * 2)] =
1783                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1784                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1785                         blk_rq_sectors(prq);
1786                 /* Argument of CMD18 or CMD25 */
1787                 packed_cmd_hdr[((i * 2)) + 1] =
1788                         mmc_card_blockaddr(card) ?
1789                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1790                 packed->blocks += blk_rq_sectors(prq);
1791                 i++;
1792         }
1793
1794         memset(brq, 0, sizeof(struct mmc_blk_request));
1795         brq->mrq.cmd = &brq->cmd;
1796         brq->mrq.data = &brq->data;
1797         brq->mrq.sbc = &brq->sbc;
1798         brq->mrq.stop = &brq->stop;
1799
1800         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1801         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1802         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1803
1804         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1805         brq->cmd.arg = blk_rq_pos(req);
1806         if (!mmc_card_blockaddr(card))
1807                 brq->cmd.arg <<= 9;
1808         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1809
1810         brq->data.blksz = 512;
1811         brq->data.blocks = packed->blocks + hdr_blocks;
1812         brq->data.flags |= MMC_DATA_WRITE;
1813
1814         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1815         brq->stop.arg = 0;
1816         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1817
1818         mmc_set_data_timeout(&brq->data, card);
1819
1820         brq->data.sg = mqrq->sg;
1821         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1822
1823         mqrq->mmc_active.mrq = &brq->mrq;
1824         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1825
1826         mmc_queue_bounce_pre(mqrq);
1827 }
1828
1829 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1830                            struct mmc_blk_request *brq, struct request *req,
1831                            int ret)
1832 {
1833         struct mmc_queue_req *mq_rq;
1834         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1835
1836         /*
1837          * If this is an SD card and we're writing, we can first
1838          * mark the known good sectors as ok.
1839          *
1840          * If the card is not SD, we can still ok written sectors
1841          * as reported by the controller (which might be less than
1842          * the real number of written sectors, but never more).
1843          */
1844         if (mmc_card_sd(card)) {
1845                 u32 blocks;
1846
1847                 blocks = mmc_sd_num_wr_blocks(card);
1848                 if (blocks != (u32)-1) {
1849                         ret = blk_end_request(req, 0, blocks << 9);
1850                 }
1851         } else {
1852                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1853                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1854         }
1855         return ret;
1856 }
1857
1858 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1859 {
1860         struct request *prq;
1861         struct mmc_packed *packed = mq_rq->packed;
1862         int idx = packed->idx_failure, i = 0;
1863         int ret = 0;
1864
1865         BUG_ON(!packed);
1866
1867         while (!list_empty(&packed->list)) {
1868                 prq = list_entry_rq(packed->list.next);
1869                 if (idx == i) {
1870                         /* retry from error index */
1871                         packed->nr_entries -= idx;
1872                         mq_rq->req = prq;
1873                         ret = 1;
1874
1875                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1876                                 list_del_init(&prq->queuelist);
1877                                 mmc_blk_clear_packed(mq_rq);
1878                         }
1879                         return ret;
1880                 }
1881                 list_del_init(&prq->queuelist);
1882                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1883                 i++;
1884         }
1885
1886         mmc_blk_clear_packed(mq_rq);
1887         return ret;
1888 }
1889
1890 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1891 {
1892         struct request *prq;
1893         struct mmc_packed *packed = mq_rq->packed;
1894
1895         BUG_ON(!packed);
1896
1897         while (!list_empty(&packed->list)) {
1898                 prq = list_entry_rq(packed->list.next);
1899                 list_del_init(&prq->queuelist);
1900                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1901         }
1902
1903         mmc_blk_clear_packed(mq_rq);
1904 }
1905
1906 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1907                                       struct mmc_queue_req *mq_rq)
1908 {
1909         struct request *prq;
1910         struct request_queue *q = mq->queue;
1911         struct mmc_packed *packed = mq_rq->packed;
1912
1913         BUG_ON(!packed);
1914
1915         while (!list_empty(&packed->list)) {
1916                 prq = list_entry_rq(packed->list.prev);
1917                 if (prq->queuelist.prev != &packed->list) {
1918                         list_del_init(&prq->queuelist);
1919                         spin_lock_irq(q->queue_lock);
1920                         blk_requeue_request(mq->queue, prq);
1921                         spin_unlock_irq(q->queue_lock);
1922                 } else {
1923                         list_del_init(&prq->queuelist);
1924                 }
1925         }
1926
1927         mmc_blk_clear_packed(mq_rq);
1928 }
1929
1930 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1931 {
1932         struct mmc_blk_data *md = mq->data;
1933         struct mmc_card *card = md->queue.card;
1934         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1935         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1936         enum mmc_blk_status status;
1937         struct mmc_queue_req *mq_rq;
1938         struct request *req = rqc;
1939         struct mmc_async_req *areq;
1940         const u8 packed_nr = 2;
1941         u8 reqs = 0;
1942
1943         if (!rqc && !mq->mqrq_prev->req)
1944                 return 0;
1945
1946         if (rqc)
1947                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1948
1949         do {
1950                 if (rqc) {
1951                         /*
1952                          * When 4KB native sector is enabled, only 8 blocks
1953                          * multiple read or write is allowed
1954                          */
1955                         if ((brq->data.blocks & 0x07) &&
1956                             (card->ext_csd.data_sector_size == 4096)) {
1957                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1958                                         req->rq_disk->disk_name);
1959                                 mq_rq = mq->mqrq_cur;
1960                                 goto cmd_abort;
1961                         }
1962
1963                         if (reqs >= packed_nr)
1964                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1965                                                             card, mq);
1966                         else
1967                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1968                         areq = &mq->mqrq_cur->mmc_active;
1969                 } else
1970                         areq = NULL;
1971                 areq = mmc_start_req(card->host, areq, (int *) &status);
1972                 if (!areq) {
1973                         if (status == MMC_BLK_NEW_REQUEST)
1974                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1975                         return 0;
1976                 }
1977
1978                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1979                 brq = &mq_rq->brq;
1980                 req = mq_rq->req;
1981                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1982                 mmc_queue_bounce_post(mq_rq);
1983
1984                 switch (status) {
1985                 case MMC_BLK_SUCCESS:
1986                 case MMC_BLK_PARTIAL:
1987                         /*
1988                          * A block was successfully transferred.
1989                          */
1990                         mmc_blk_reset_success(md, type);
1991
1992                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1993                                 ret = mmc_blk_end_packed_req(mq_rq);
1994                                 break;
1995                         } else {
1996                                 ret = blk_end_request(req, 0,
1997                                                 brq->data.bytes_xfered);
1998                         }
1999
2000                         /*
2001                          * If the blk_end_request function returns non-zero even
2002                          * though all data has been transferred and no errors
2003                          * were returned by the host controller, it's a bug.
2004                          */
2005                         if (status == MMC_BLK_SUCCESS && ret) {
2006                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2007                                        __func__, blk_rq_bytes(req),
2008                                        brq->data.bytes_xfered);
2009                                 rqc = NULL;
2010                                 goto cmd_abort;
2011                         }
2012                         break;
2013                 case MMC_BLK_CMD_ERR:
2014                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2015                         if (mmc_blk_reset(md, card->host, type))
2016                                 goto cmd_abort;
2017                         if (!ret)
2018                                 goto start_new_req;
2019                         break;
2020                 case MMC_BLK_RETRY:
2021                         retune_retry_done = brq->retune_retry_done;
2022                         if (retry++ < 5)
2023                                 break;
2024                         /* Fall through */
2025                 case MMC_BLK_ABORT:
2026                         if (!mmc_blk_reset(md, card->host, type))
2027                                 break;
2028                         goto cmd_abort;
2029                 case MMC_BLK_DATA_ERR: {
2030                         int err;
2031
2032                         err = mmc_blk_reset(md, card->host, type);
2033                         if (!err)
2034                                 break;
2035                         if (err == -ENODEV ||
2036                                 mmc_packed_cmd(mq_rq->cmd_type))
2037                                 goto cmd_abort;
2038                         /* Fall through */
2039                 }
2040                 case MMC_BLK_ECC_ERR:
2041                         if (brq->data.blocks > 1) {
2042                                 /* Redo read one sector at a time */
2043                                 pr_warn("%s: retrying using single block read\n",
2044                                         req->rq_disk->disk_name);
2045                                 disable_multi = 1;
2046                                 break;
2047                         }
2048                         /*
2049                          * After an error, we redo I/O one sector at a
2050                          * time, so we only reach here after trying to
2051                          * read a single sector.
2052                          */
2053                         ret = blk_end_request(req, -EIO,
2054                                                 brq->data.blksz);
2055                         if (!ret)
2056                                 goto start_new_req;
2057                         break;
2058                 case MMC_BLK_NOMEDIUM:
2059                         goto cmd_abort;
2060                 default:
2061                         pr_err("%s: Unhandled return value (%d)",
2062                                         req->rq_disk->disk_name, status);
2063                         goto cmd_abort;
2064                 }
2065
2066                 if (ret) {
2067                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2068                                 if (!mq_rq->packed->retries)
2069                                         goto cmd_abort;
2070                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2071                                 mmc_start_req(card->host,
2072                                               &mq_rq->mmc_active, NULL);
2073                         } else {
2074
2075                                 /*
2076                                  * In case of a incomplete request
2077                                  * prepare it again and resend.
2078                                  */
2079                                 mmc_blk_rw_rq_prep(mq_rq, card,
2080                                                 disable_multi, mq);
2081                                 mmc_start_req(card->host,
2082                                                 &mq_rq->mmc_active, NULL);
2083                         }
2084                         mq_rq->brq.retune_retry_done = retune_retry_done;
2085                 }
2086         } while (ret);
2087
2088         return 1;
2089
2090  cmd_abort:
2091         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2092                 mmc_blk_abort_packed_req(mq_rq);
2093         } else {
2094                 if (mmc_card_removed(card))
2095                         req->cmd_flags |= REQ_QUIET;
2096                 while (ret)
2097                         ret = blk_end_request(req, -EIO,
2098                                         blk_rq_cur_bytes(req));
2099         }
2100
2101  start_new_req:
2102         if (rqc) {
2103                 if (mmc_card_removed(card)) {
2104                         rqc->cmd_flags |= REQ_QUIET;
2105                         blk_end_request_all(rqc, -EIO);
2106                 } else {
2107                         /*
2108                          * If current request is packed, it needs to put back.
2109                          */
2110                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2111                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2112
2113                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2114                         mmc_start_req(card->host,
2115                                       &mq->mqrq_cur->mmc_active, NULL);
2116                 }
2117         }
2118
2119         return 0;
2120 }
2121
2122 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2123 {
2124         int ret;
2125         struct mmc_blk_data *md = mq->data;
2126         struct mmc_card *card = md->queue.card;
2127         struct mmc_host *host = card->host;
2128         unsigned long flags;
2129         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2130
2131         if (req && !mq->mqrq_prev->req)
2132                 /* claim host only for the first request */
2133                 mmc_get_card(card);
2134
2135         ret = mmc_blk_part_switch(card, md);
2136         if (ret) {
2137                 if (req) {
2138                         blk_end_request_all(req, -EIO);
2139                 }
2140                 ret = 0;
2141                 goto out;
2142         }
2143
2144         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2145         if (cmd_flags & REQ_DISCARD) {
2146                 /* complete ongoing async transfer before issuing discard */
2147                 if (card->host->areq)
2148                         mmc_blk_issue_rw_rq(mq, NULL);
2149                 if (req->cmd_flags & REQ_SECURE)
2150                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2151                 else
2152                         ret = mmc_blk_issue_discard_rq(mq, req);
2153         } else if (cmd_flags & REQ_FLUSH) {
2154                 /* complete ongoing async transfer before issuing flush */
2155                 if (card->host->areq)
2156                         mmc_blk_issue_rw_rq(mq, NULL);
2157                 ret = mmc_blk_issue_flush(mq, req);
2158         } else {
2159                 if (!req && host->areq) {
2160                         spin_lock_irqsave(&host->context_info.lock, flags);
2161                         host->context_info.is_waiting_last_req = true;
2162                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2163                 }
2164                 ret = mmc_blk_issue_rw_rq(mq, req);
2165         }
2166
2167 out:
2168         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2169              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2170                 /*
2171                  * Release host when there are no more requests
2172                  * and after special request(discard, flush) is done.
2173                  * In case sepecial request, there is no reentry to
2174                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2175                  */
2176                 mmc_put_card(card);
2177         return ret;
2178 }
2179
2180 static inline int mmc_blk_readonly(struct mmc_card *card)
2181 {
2182         return mmc_card_readonly(card) ||
2183                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2184 }
2185
2186 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2187                                               struct device *parent,
2188                                               sector_t size,
2189                                               bool default_ro,
2190                                               const char *subname,
2191                                               int area_type)
2192 {
2193         struct mmc_blk_data *md;
2194         int devidx, ret;
2195
2196         devidx = find_first_zero_bit(dev_use, max_devices);
2197         if (devidx >= max_devices)
2198                 return ERR_PTR(-ENOSPC);
2199         __set_bit(devidx, dev_use);
2200
2201         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2202         if (!md) {
2203                 ret = -ENOMEM;
2204                 goto out;
2205         }
2206
2207         /*
2208          * !subname implies we are creating main mmc_blk_data that will be
2209          * associated with mmc_card with dev_set_drvdata. Due to device
2210          * partitions, devidx will not coincide with a per-physical card
2211          * index anymore so we keep track of a name index.
2212          */
2213         if (!subname) {
2214                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2215                 __set_bit(md->name_idx, name_use);
2216         } else
2217                 md->name_idx = ((struct mmc_blk_data *)
2218                                 dev_to_disk(parent)->private_data)->name_idx;
2219
2220         md->area_type = area_type;
2221
2222         /*
2223          * Set the read-only status based on the supported commands
2224          * and the write protect switch.
2225          */
2226         md->read_only = mmc_blk_readonly(card);
2227
2228         md->disk = alloc_disk(perdev_minors);
2229         if (md->disk == NULL) {
2230                 ret = -ENOMEM;
2231                 goto err_kfree;
2232         }
2233
2234         spin_lock_init(&md->lock);
2235         INIT_LIST_HEAD(&md->part);
2236         md->usage = 1;
2237
2238         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2239         if (ret)
2240                 goto err_putdisk;
2241
2242         md->queue.issue_fn = mmc_blk_issue_rq;
2243         md->queue.data = md;
2244
2245         md->disk->major = MMC_BLOCK_MAJOR;
2246         md->disk->first_minor = devidx * perdev_minors;
2247         md->disk->fops = &mmc_bdops;
2248         md->disk->private_data = md;
2249         md->disk->queue = md->queue.queue;
2250         md->disk->driverfs_dev = parent;
2251         set_disk_ro(md->disk, md->read_only || default_ro);
2252         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2253                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2254
2255         /*
2256          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2257          *
2258          * - be set for removable media with permanent block devices
2259          * - be unset for removable block devices with permanent media
2260          *
2261          * Since MMC block devices clearly fall under the second
2262          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2263          * should use the block device creation/destruction hotplug
2264          * messages to tell when the card is present.
2265          */
2266
2267         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2268                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2269
2270         if (mmc_card_mmc(card))
2271                 blk_queue_logical_block_size(md->queue.queue,
2272                                              card->ext_csd.data_sector_size);
2273         else
2274                 blk_queue_logical_block_size(md->queue.queue, 512);
2275
2276         set_capacity(md->disk, size);
2277
2278         if (mmc_host_cmd23(card->host)) {
2279                 if (mmc_card_mmc(card) ||
2280                     (mmc_card_sd(card) &&
2281                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2282                         md->flags |= MMC_BLK_CMD23;
2283         }
2284
2285         if (mmc_card_mmc(card) &&
2286             md->flags & MMC_BLK_CMD23 &&
2287             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2288              card->ext_csd.rel_sectors)) {
2289                 md->flags |= MMC_BLK_REL_WR;
2290                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2291         }
2292
2293         if (mmc_card_mmc(card) &&
2294             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2295             (md->flags & MMC_BLK_CMD23) &&
2296             card->ext_csd.packed_event_en) {
2297                 if (!mmc_packed_init(&md->queue, card))
2298                         md->flags |= MMC_BLK_PACKED_CMD;
2299         }
2300
2301         return md;
2302
2303  err_putdisk:
2304         put_disk(md->disk);
2305  err_kfree:
2306         kfree(md);
2307  out:
2308         return ERR_PTR(ret);
2309 }
2310
2311 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2312 {
2313         sector_t size;
2314
2315         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2316                 /*
2317                  * The EXT_CSD sector count is in number or 512 byte
2318                  * sectors.
2319                  */
2320                 size = card->ext_csd.sectors;
2321         } else {
2322                 /*
2323                  * The CSD capacity field is in units of read_blkbits.
2324                  * set_capacity takes units of 512 bytes.
2325                  */
2326                 size = (typeof(sector_t))card->csd.capacity
2327                         << (card->csd.read_blkbits - 9);
2328         }
2329
2330         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2331                                         MMC_BLK_DATA_AREA_MAIN);
2332 }
2333
2334 static int mmc_blk_alloc_part(struct mmc_card *card,
2335                               struct mmc_blk_data *md,
2336                               unsigned int part_type,
2337                               sector_t size,
2338                               bool default_ro,
2339                               const char *subname,
2340                               int area_type)
2341 {
2342         char cap_str[10];
2343         struct mmc_blk_data *part_md;
2344
2345         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2346                                     subname, area_type);
2347         if (IS_ERR(part_md))
2348                 return PTR_ERR(part_md);
2349         part_md->part_type = part_type;
2350         list_add(&part_md->part, &md->part);
2351
2352         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2353                         cap_str, sizeof(cap_str));
2354         pr_info("%s: %s %s partition %u %s\n",
2355                part_md->disk->disk_name, mmc_card_id(card),
2356                mmc_card_name(card), part_md->part_type, cap_str);
2357         return 0;
2358 }
2359
2360 /* MMC Physical partitions consist of two boot partitions and
2361  * up to four general purpose partitions.
2362  * For each partition enabled in EXT_CSD a block device will be allocatedi
2363  * to provide access to the partition.
2364  */
2365
2366 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2367 {
2368         int idx, ret = 0;
2369
2370         if (!mmc_card_mmc(card))
2371                 return 0;
2372
2373         for (idx = 0; idx < card->nr_parts; idx++) {
2374                 if (card->part[idx].size) {
2375                         ret = mmc_blk_alloc_part(card, md,
2376                                 card->part[idx].part_cfg,
2377                                 card->part[idx].size >> 9,
2378                                 card->part[idx].force_ro,
2379                                 card->part[idx].name,
2380                                 card->part[idx].area_type);
2381                         if (ret)
2382                                 return ret;
2383                 }
2384         }
2385
2386         return ret;
2387 }
2388
2389 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2390 {
2391         struct mmc_card *card;
2392
2393         if (md) {
2394                 /*
2395                  * Flush remaining requests and free queues. It
2396                  * is freeing the queue that stops new requests
2397                  * from being accepted.
2398                  */
2399                 card = md->queue.card;
2400                 mmc_cleanup_queue(&md->queue);
2401                 if (md->flags & MMC_BLK_PACKED_CMD)
2402                         mmc_packed_clean(&md->queue);
2403                 if (md->disk->flags & GENHD_FL_UP) {
2404                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2405                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2406                                         card->ext_csd.boot_ro_lockable)
2407                                 device_remove_file(disk_to_dev(md->disk),
2408                                         &md->power_ro_lock);
2409
2410                         del_gendisk(md->disk);
2411                 }
2412                 mmc_blk_put(md);
2413         }
2414 }
2415
2416 static void mmc_blk_remove_parts(struct mmc_card *card,
2417                                  struct mmc_blk_data *md)
2418 {
2419         struct list_head *pos, *q;
2420         struct mmc_blk_data *part_md;
2421
2422         __clear_bit(md->name_idx, name_use);
2423         list_for_each_safe(pos, q, &md->part) {
2424                 part_md = list_entry(pos, struct mmc_blk_data, part);
2425                 list_del(pos);
2426                 mmc_blk_remove_req(part_md);
2427         }
2428 }
2429
2430 static int mmc_add_disk(struct mmc_blk_data *md)
2431 {
2432         int ret;
2433         struct mmc_card *card = md->queue.card;
2434
2435         add_disk(md->disk);
2436         md->force_ro.show = force_ro_show;
2437         md->force_ro.store = force_ro_store;
2438         sysfs_attr_init(&md->force_ro.attr);
2439         md->force_ro.attr.name = "force_ro";
2440         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2441         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2442         if (ret)
2443                 goto force_ro_fail;
2444
2445         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2446              card->ext_csd.boot_ro_lockable) {
2447                 umode_t mode;
2448
2449                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2450                         mode = S_IRUGO;
2451                 else
2452                         mode = S_IRUGO | S_IWUSR;
2453
2454                 md->power_ro_lock.show = power_ro_lock_show;
2455                 md->power_ro_lock.store = power_ro_lock_store;
2456                 sysfs_attr_init(&md->power_ro_lock.attr);
2457                 md->power_ro_lock.attr.mode = mode;
2458                 md->power_ro_lock.attr.name =
2459                                         "ro_lock_until_next_power_on";
2460                 ret = device_create_file(disk_to_dev(md->disk),
2461                                 &md->power_ro_lock);
2462                 if (ret)
2463                         goto power_ro_lock_fail;
2464         }
2465         return ret;
2466
2467 power_ro_lock_fail:
2468         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2469 force_ro_fail:
2470         del_gendisk(md->disk);
2471
2472         return ret;
2473 }
2474
2475 #define CID_MANFID_SANDISK      0x2
2476 #define CID_MANFID_TOSHIBA      0x11
2477 #define CID_MANFID_MICRON       0x13
2478 #define CID_MANFID_SAMSUNG      0x15
2479 #define CID_MANFID_KINGSTON     0x70
2480
2481 static const struct mmc_fixup blk_fixups[] =
2482 {
2483         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2484                   MMC_QUIRK_INAND_CMD38),
2485         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2486                   MMC_QUIRK_INAND_CMD38),
2487         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2488                   MMC_QUIRK_INAND_CMD38),
2489         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2490                   MMC_QUIRK_INAND_CMD38),
2491         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2492                   MMC_QUIRK_INAND_CMD38),
2493
2494         /*
2495          * Some MMC cards experience performance degradation with CMD23
2496          * instead of CMD12-bounded multiblock transfers. For now we'll
2497          * black list what's bad...
2498          * - Certain Toshiba cards.
2499          *
2500          * N.B. This doesn't affect SD cards.
2501          */
2502         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2503                   MMC_QUIRK_BLK_NO_CMD23),
2504         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2505                   MMC_QUIRK_BLK_NO_CMD23),
2506         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2507                   MMC_QUIRK_BLK_NO_CMD23),
2508         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2509                   MMC_QUIRK_BLK_NO_CMD23),
2510         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2511                   MMC_QUIRK_BLK_NO_CMD23),
2512
2513         /*
2514          * Some Micron MMC cards needs longer data read timeout than
2515          * indicated in CSD.
2516          */
2517         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2518                   MMC_QUIRK_LONG_READ_TIME),
2519
2520         /*
2521          * On these Samsung MoviNAND parts, performing secure erase or
2522          * secure trim can result in unrecoverable corruption due to a
2523          * firmware bug.
2524          */
2525         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2526                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2527         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2528                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2529         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2530                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2531         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2532                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2533         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2534                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2535         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2536                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2537         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2538                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2539         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2540                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2541
2542         /*
2543          *  On Some Kingston eMMCs, performing trim can result in
2544          *  unrecoverable data conrruption occasionally due to a firmware bug.
2545          */
2546         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2547                   MMC_QUIRK_TRIM_BROKEN),
2548         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2549                   MMC_QUIRK_TRIM_BROKEN),
2550
2551         END_FIXUP
2552 };
2553
2554 static int mmc_blk_probe(struct mmc_card *card)
2555 {
2556         struct mmc_blk_data *md, *part_md;
2557         char cap_str[10];
2558
2559         /*
2560          * Check that the card supports the command class(es) we need.
2561          */
2562         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2563                 return -ENODEV;
2564
2565         mmc_fixup_device(card, blk_fixups);
2566
2567         md = mmc_blk_alloc(card);
2568         if (IS_ERR(md))
2569                 return PTR_ERR(md);
2570
2571         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2572                         cap_str, sizeof(cap_str));
2573         pr_info("%s: %s %s %s %s\n",
2574                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2575                 cap_str, md->read_only ? "(ro)" : "");
2576
2577         if (mmc_blk_alloc_parts(card, md))
2578                 goto out;
2579
2580         dev_set_drvdata(&card->dev, md);
2581
2582         if (mmc_add_disk(md))
2583                 goto out;
2584
2585         list_for_each_entry(part_md, &md->part, part) {
2586                 if (mmc_add_disk(part_md))
2587                         goto out;
2588         }
2589
2590         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2591         pm_runtime_use_autosuspend(&card->dev);
2592
2593         /*
2594          * Don't enable runtime PM for SD-combo cards here. Leave that
2595          * decision to be taken during the SDIO init sequence instead.
2596          */
2597         if (card->type != MMC_TYPE_SD_COMBO) {
2598                 pm_runtime_set_active(&card->dev);
2599                 pm_runtime_enable(&card->dev);
2600         }
2601
2602         return 0;
2603
2604  out:
2605         mmc_blk_remove_parts(card, md);
2606         mmc_blk_remove_req(md);
2607         return 0;
2608 }
2609
2610 static void mmc_blk_remove(struct mmc_card *card)
2611 {
2612         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2613
2614         mmc_blk_remove_parts(card, md);
2615         pm_runtime_get_sync(&card->dev);
2616         mmc_claim_host(card->host);
2617         mmc_blk_part_switch(card, md);
2618         mmc_release_host(card->host);
2619         if (card->type != MMC_TYPE_SD_COMBO)
2620                 pm_runtime_disable(&card->dev);
2621         pm_runtime_put_noidle(&card->dev);
2622         mmc_blk_remove_req(md);
2623         dev_set_drvdata(&card->dev, NULL);
2624 }
2625
2626 static int _mmc_blk_suspend(struct mmc_card *card)
2627 {
2628         struct mmc_blk_data *part_md;
2629         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2630
2631         if (md) {
2632                 mmc_queue_suspend(&md->queue);
2633                 list_for_each_entry(part_md, &md->part, part) {
2634                         mmc_queue_suspend(&part_md->queue);
2635                 }
2636         }
2637         return 0;
2638 }
2639
2640 static void mmc_blk_shutdown(struct mmc_card *card)
2641 {
2642         _mmc_blk_suspend(card);
2643 }
2644
2645 #ifdef CONFIG_PM_SLEEP
2646 static int mmc_blk_suspend(struct device *dev)
2647 {
2648         struct mmc_card *card = mmc_dev_to_card(dev);
2649
2650         return _mmc_blk_suspend(card);
2651 }
2652
2653 static int mmc_blk_resume(struct device *dev)
2654 {
2655         struct mmc_blk_data *part_md;
2656         struct mmc_blk_data *md = dev_get_drvdata(dev);
2657
2658         if (md) {
2659                 /*
2660                  * Resume involves the card going into idle state,
2661                  * so current partition is always the main one.
2662                  */
2663                 md->part_curr = md->part_type;
2664                 mmc_queue_resume(&md->queue);
2665                 list_for_each_entry(part_md, &md->part, part) {
2666                         mmc_queue_resume(&part_md->queue);
2667                 }
2668         }
2669         return 0;
2670 }
2671 #endif
2672
2673 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2674
2675 static struct mmc_driver mmc_driver = {
2676         .drv            = {
2677                 .name   = "mmcblk",
2678                 .pm     = &mmc_blk_pm_ops,
2679         },
2680         .probe          = mmc_blk_probe,
2681         .remove         = mmc_blk_remove,
2682         .shutdown       = mmc_blk_shutdown,
2683 };
2684
2685 static int __init mmc_blk_init(void)
2686 {
2687         int res;
2688
2689         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2690                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2691
2692         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2693
2694         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2695         if (res)
2696                 goto out;
2697
2698         res = mmc_register_driver(&mmc_driver);
2699         if (res)
2700                 goto out2;
2701
2702         return 0;
2703  out2:
2704         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2705  out:
2706         return res;
2707 }
2708
2709 static void __exit mmc_blk_exit(void)
2710 {
2711         mmc_unregister_driver(&mmc_driver);
2712         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2713 }
2714
2715 module_init(mmc_blk_init);
2716 module_exit(mmc_blk_exit);
2717
2718 MODULE_LICENSE("GPL");
2719 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2720