drivers/mmc/core/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38 #include <linux/idr.h>
  39
  40 #include <linux/mmc/ioctl.h>
  41 #include <linux/mmc/card.h>
  42 #include <linux/mmc/host.h>
  43 #include <linux/mmc/mmc.h>
  44 #include <linux/mmc/sd.h>
  45
  46 #include <linux/uaccess.h>
  47
  48 #include "queue.h"
  49 #include "block.h"
  50 #include "core.h"
  51 #include "card.h"
  52 #include "host.h"
  53 #include "bus.h"
  54 #include "mmc_ops.h"
  55 #include "quirks.h"
  56 #include "sd_ops.h"
  57
  58 MODULE_ALIAS("mmc:block");
  59 #ifdef MODULE_PARAM_PREFIX
  60 #undef MODULE_PARAM_PREFIX
  61 #endif
  62 #define MODULE_PARAM_PREFIX "mmcblk."
  63
  64 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  65 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  66 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  67
  68 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  69                                   (rq_data_dir(req) == WRITE))
  70 static DEFINE_MUTEX(block_mutex);
  71
  72 /*
  73  * The defaults come from config options but can be overriden by module
  74  * or bootarg options.
  75  */
  76 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  77
  78 /*
  79  * We've only got one major, so number of mmcblk devices is
  80  * limited to (1 << 20) / number of minors per device.  It is also
  81  * limited by the MAX_DEVICES below.
  82  */
  83 static int max_devices;
  84
  85 #define MAX_DEVICES 256
  86
  87 static DEFINE_IDA(mmc_blk_ida);
  88
  89 /*
  90  * There is one mmc_blk_data per slot.
  91  */
  92 struct mmc_blk_data {
  93         spinlock_t      lock;
  94         struct device   *parent;
  95         struct gendisk  *disk;
  96         struct mmc_queue queue;
  97         struct list_head part;
  98
  99         unsigned int    flags;
 100 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 101 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 102
 103         unsigned int    usage;
 104         unsigned int    read_only;
 105         unsigned int    part_type;
 106         unsigned int    reset_done;
 107 #define MMC_BLK_READ            BIT(0)
 108 #define MMC_BLK_WRITE           BIT(1)
 109 #define MMC_BLK_DISCARD         BIT(2)
 110 #define MMC_BLK_SECDISCARD      BIT(3)
 111
 112         /*
 113          * Only set in main mmc_blk_data associated
 114          * with mmc_card with dev_set_drvdata, and keeps
 115          * track of the current selected device partition.
 116          */
 117         unsigned int    part_curr;
 118         struct device_attribute force_ro;
 119         struct device_attribute power_ro_lock;
 120         int     area_type;
 121 };
 122
 123 static DEFINE_MUTEX(open_lock);
 124
 125 module_param(perdev_minors, int, 0444);
 126 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 127
 128 static inline int mmc_blk_part_switch(struct mmc_card *card,
 129                                       struct mmc_blk_data *md);
 130 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 131
 132 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 133 {
 134         struct mmc_blk_data *md;
 135
 136         mutex_lock(&open_lock);
 137         md = disk->private_data;
 138         if (md && md->usage == 0)
 139                 md = NULL;
 140         if (md)
 141                 md->usage++;
 142         mutex_unlock(&open_lock);
 143
 144         return md;
 145 }
 146
 147 static inline int mmc_get_devidx(struct gendisk *disk)
 148 {
 149         int devidx = disk->first_minor / perdev_minors;
 150         return devidx;
 151 }
 152
 153 static void mmc_blk_put(struct mmc_blk_data *md)
 154 {
 155         mutex_lock(&open_lock);
 156         md->usage--;
 157         if (md->usage == 0) {
 158                 int devidx = mmc_get_devidx(md->disk);
 159                 blk_cleanup_queue(md->queue.queue);
 160                 ida_simple_remove(&mmc_blk_ida, devidx);
 161                 put_disk(md->disk);
 162                 kfree(md);
 163         }
 164         mutex_unlock(&open_lock);
 165 }
 166
 167 static ssize_t power_ro_lock_show(struct device *dev,
 168                 struct device_attribute *attr, char *buf)
 169 {
 170         int ret;
 171         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 172         struct mmc_card *card = md->queue.card;
 173         int locked = 0;
 174
 175         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 176                 locked = 2;
 177         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 178                 locked = 1;
 179
 180         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 181
 182         mmc_blk_put(md);
 183
 184         return ret;
 185 }
 186
 187 static ssize_t power_ro_lock_store(struct device *dev,
 188                 struct device_attribute *attr, const char *buf, size_t count)
 189 {
 190         int ret;
 191         struct mmc_blk_data *md, *part_md;
 192         struct mmc_card *card;
 193         unsigned long set;
 194
 195         if (kstrtoul(buf, 0, &set))
 196                 return -EINVAL;
 197
 198         if (set != 1)
 199                 return count;
 200
 201         md = mmc_blk_get(dev_to_disk(dev));
 202         card = md->queue.card;
 203
 204         mmc_get_card(card);
 205
 206         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 207                                 card->ext_csd.boot_ro_lock |
 208                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 209                                 card->ext_csd.part_time);
 210         if (ret)
 211                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 212         else
 213                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 214
 215         mmc_put_card(card);
 216
 217         if (!ret) {
 218                 pr_info("%s: Locking boot partition ro until next power on\n",
 219                         md->disk->disk_name);
 220                 set_disk_ro(md->disk, 1);
 221
 222                 list_for_each_entry(part_md, &md->part, part)
 223                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 224                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 225                                 set_disk_ro(part_md->disk, 1);
 226                         }
 227         }
 228
 229         mmc_blk_put(md);
 230         return count;
 231 }
 232
 233 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 234                              char *buf)
 235 {
 236         int ret;
 237         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 238
 239         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 240                        get_disk_ro(dev_to_disk(dev)) ^
 241                        md->read_only);
 242         mmc_blk_put(md);
 243         return ret;
 244 }
 245
 246 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 247                               const char *buf, size_t count)
 248 {
 249         int ret;
 250         char *end;
 251         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 252         unsigned long set = simple_strtoul(buf, &end, 0);
 253         if (end == buf) {
 254                 ret = -EINVAL;
 255                 goto out;
 256         }
 257
 258         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 259         ret = count;
 260 out:
 261         mmc_blk_put(md);
 262         return ret;
 263 }
 264
 265 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 266 {
 267         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 268         int ret = -ENXIO;
 269
 270         mutex_lock(&block_mutex);
 271         if (md) {
 272                 if (md->usage == 2)
 273                         check_disk_change(bdev);
 274                 ret = 0;
 275
 276                 if ((mode & FMODE_WRITE) && md->read_only) {
 277                         mmc_blk_put(md);
 278                         ret = -EROFS;
 279                 }
 280         }
 281         mutex_unlock(&block_mutex);
 282
 283         return ret;
 284 }
 285
 286 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 287 {
 288         struct mmc_blk_data *md = disk->private_data;
 289
 290         mutex_lock(&block_mutex);
 291         mmc_blk_put(md);
 292         mutex_unlock(&block_mutex);
 293 }
 294
 295 static int
 296 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 297 {
 298         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 299         geo->heads = 4;
 300         geo->sectors = 16;
 301         return 0;
 302 }
 303
 304 struct mmc_blk_ioc_data {
 305         struct mmc_ioc_cmd ic;
 306         unsigned char *buf;
 307         u64 buf_bytes;
 308 };
 309
 310 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 311         struct mmc_ioc_cmd __user *user)
 312 {
 313         struct mmc_blk_ioc_data *idata;
 314         int err;
 315
 316         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 317         if (!idata) {
 318                 err = -ENOMEM;
 319                 goto out;
 320         }
 321
 322         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 323                 err = -EFAULT;
 324                 goto idata_err;
 325         }
 326
 327         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 328         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 329                 err = -EOVERFLOW;
 330                 goto idata_err;
 331         }
 332
 333         if (!idata->buf_bytes) {
 334                 idata->buf = NULL;
 335                 return idata;
 336         }
 337
 338         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 339         if (!idata->buf) {
 340                 err = -ENOMEM;
 341                 goto idata_err;
 342         }
 343
 344         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 345                                         idata->ic.data_ptr, idata->buf_bytes)) {
 346                 err = -EFAULT;
 347                 goto copy_err;
 348         }
 349
 350         return idata;
 351
 352 copy_err:
 353         kfree(idata->buf);
 354 idata_err:
 355         kfree(idata);
 356 out:
 357         return ERR_PTR(err);
 358 }
 359
 360 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 361                                       struct mmc_blk_ioc_data *idata)
 362 {
 363         struct mmc_ioc_cmd *ic = &idata->ic;
 364
 365         if (copy_to_user(&(ic_ptr->response), ic->response,
 366                          sizeof(ic->response)))
 367                 return -EFAULT;
 368
 369         if (!idata->ic.write_flag) {
 370                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 371                                  idata->buf, idata->buf_bytes))
 372                         return -EFAULT;
 373         }
 374
 375         return 0;
 376 }
 377
 378 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 379                                        u32 retries_max)
 380 {
 381         int err;
 382         u32 retry_count = 0;
 383
 384         if (!status || !retries_max)
 385                 return -EINVAL;
 386
 387         do {
 388                 err = get_card_status(card, status, 5);
 389                 if (err)
 390                         break;
 391
 392                 if (!R1_STATUS(*status) &&
 393                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 394                         break; /* RPMB programming operation complete */
 395
 396                 /*
 397                  * Rechedule to give the MMC device a chance to continue
 398                  * processing the previous command without being polled too
 399                  * frequently.
 400                  */
 401                 usleep_range(1000, 5000);
 402         } while (++retry_count < retries_max);
 403
 404         if (retry_count == retries_max)
 405                 err = -EPERM;
 406
 407         return err;
 408 }
 409
 410 static int ioctl_do_sanitize(struct mmc_card *card)
 411 {
 412         int err;
 413
 414         if (!mmc_can_sanitize(card)) {
 415                         pr_warn("%s: %s - SANITIZE is not supported\n",
 416                                 mmc_hostname(card->host), __func__);
 417                         err = -EOPNOTSUPP;
 418                         goto out;
 419         }
 420
 421         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 422                 mmc_hostname(card->host), __func__);
 423
 424         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 425                                         EXT_CSD_SANITIZE_START, 1,
 426                                         MMC_SANITIZE_REQ_TIMEOUT);
 427
 428         if (err)
 429                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 430                        mmc_hostname(card->host), __func__, err);
 431
 432         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 433                                              __func__);
 434 out:
 435         return err;
 436 }
 437
 438 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 439                                struct mmc_blk_ioc_data *idata)
 440 {
 441         struct mmc_command cmd = {};
 442         struct mmc_data data = {};
 443         struct mmc_request mrq = {};
 444         struct scatterlist sg;
 445         int err;
 446         int is_rpmb = false;
 447         u32 status = 0;
 448
 449         if (!card || !md || !idata)
 450                 return -EINVAL;
 451
 452         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 453                 is_rpmb = true;
 454
 455         cmd.opcode = idata->ic.opcode;
 456         cmd.arg = idata->ic.arg;
 457         cmd.flags = idata->ic.flags;
 458
 459         if (idata->buf_bytes) {
 460                 data.sg = &sg;
 461                 data.sg_len = 1;
 462                 data.blksz = idata->ic.blksz;
 463                 data.blocks = idata->ic.blocks;
 464
 465                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 466
 467                 if (idata->ic.write_flag)
 468                         data.flags = MMC_DATA_WRITE;
 469                 else
 470                         data.flags = MMC_DATA_READ;
 471
 472                 /* data.flags must already be set before doing this. */
 473                 mmc_set_data_timeout(&data, card);
 474
 475                 /* Allow overriding the timeout_ns for empirical tuning. */
 476                 if (idata->ic.data_timeout_ns)
 477                         data.timeout_ns = idata->ic.data_timeout_ns;
 478
 479                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 480                         /*
 481                          * Pretend this is a data transfer and rely on the
 482                          * host driver to compute timeout.  When all host
 483                          * drivers support cmd.cmd_timeout for R1B, this
 484                          * can be changed to:
 485                          *
 486                          *     mrq.data = NULL;
 487                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 488                          */
 489                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 490                 }
 491
 492                 mrq.data = &data;
 493         }
 494
 495         mrq.cmd = &cmd;
 496
 497         err = mmc_blk_part_switch(card, md);
 498         if (err)
 499                 return err;
 500
 501         if (idata->ic.is_acmd) {
 502                 err = mmc_app_cmd(card->host, card);
 503                 if (err)
 504                         return err;
 505         }
 506
 507         if (is_rpmb) {
 508                 err = mmc_set_blockcount(card, data.blocks,
 509                         idata->ic.write_flag & (1 << 31));
 510                 if (err)
 511                         return err;
 512         }
 513
 514         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 515             (cmd.opcode == MMC_SWITCH)) {
 516                 err = ioctl_do_sanitize(card);
 517
 518                 if (err)
 519                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 520                                __func__, err);
 521
 522                 return err;
 523         }
 524
 525         mmc_wait_for_req(card->host, &mrq);
 526
 527         if (cmd.error) {
 528                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 529                                                 __func__, cmd.error);
 530                 return cmd.error;
 531         }
 532         if (data.error) {
 533                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 534                                                 __func__, data.error);
 535                 return data.error;
 536         }
 537
 538         /*
 539          * According to the SD specs, some commands require a delay after
 540          * issuing the command.
 541          */
 542         if (idata->ic.postsleep_min_us)
 543                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 544
 545         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 546
 547         if (is_rpmb) {
 548                 /*
 549                  * Ensure RPMB command has completed by polling CMD13
 550                  * "Send Status".
 551                  */
 552                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 553                 if (err)
 554                         dev_err(mmc_dev(card->host),
 555                                         "%s: Card Status=0x%08X, error %d\n",
 556                                         __func__, status, err);
 557         }
 558
 559         return err;
 560 }
 561
 562 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 563                              struct mmc_ioc_cmd __user *ic_ptr)
 564 {
 565         struct mmc_blk_ioc_data *idata;
 566         struct mmc_blk_data *md;
 567         struct mmc_card *card;
 568         int err = 0, ioc_err = 0;
 569
 570         /*
 571          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 572          * whole block device, not on a partition.  This prevents overspray
 573          * between sibling partitions.
 574          */
 575         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 576                 return -EPERM;
 577
 578         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 579         if (IS_ERR(idata))
 580                 return PTR_ERR(idata);
 581
 582         md = mmc_blk_get(bdev->bd_disk);
 583         if (!md) {
 584                 err = -EINVAL;
 585                 goto cmd_err;
 586         }
 587
 588         card = md->queue.card;
 589         if (IS_ERR(card)) {
 590                 err = PTR_ERR(card);
 591                 goto cmd_done;
 592         }
 593
 594         mmc_get_card(card);
 595
 596         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 597
 598         /* Always switch back to main area after RPMB access */
 599         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 600                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 601
 602         mmc_put_card(card);
 603
 604         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 605
 606 cmd_done:
 607         mmc_blk_put(md);
 608 cmd_err:
 609         kfree(idata->buf);
 610         kfree(idata);
 611         return ioc_err ? ioc_err : err;
 612 }
 613
 614 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 615                                    struct mmc_ioc_multi_cmd __user *user)
 616 {
 617         struct mmc_blk_ioc_data **idata = NULL;
 618         struct mmc_ioc_cmd __user *cmds = user->cmds;
 619         struct mmc_card *card;
 620         struct mmc_blk_data *md;
 621         int i, err = 0, ioc_err = 0;
 622         __u64 num_of_cmds;
 623
 624         /*
 625          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 626          * whole block device, not on a partition.  This prevents overspray
 627          * between sibling partitions.
 628          */
 629         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 630                 return -EPERM;
 631
 632         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 633                            sizeof(num_of_cmds)))
 634                 return -EFAULT;
 635
 636         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 637                 return -EINVAL;
 638
 639         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 640         if (!idata)
 641                 return -ENOMEM;
 642
 643         for (i = 0; i < num_of_cmds; i++) {
 644                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 645                 if (IS_ERR(idata[i])) {
 646                         err = PTR_ERR(idata[i]);
 647                         num_of_cmds = i;
 648                         goto cmd_err;
 649                 }
 650         }
 651
 652         md = mmc_blk_get(bdev->bd_disk);
 653         if (!md) {
 654                 err = -EINVAL;
 655                 goto cmd_err;
 656         }
 657
 658         card = md->queue.card;
 659         if (IS_ERR(card)) {
 660                 err = PTR_ERR(card);
 661                 goto cmd_done;
 662         }
 663
 664         mmc_get_card(card);
 665
 666         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 667                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 668
 669         /* Always switch back to main area after RPMB access */
 670         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 671                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 672
 673         mmc_put_card(card);
 674
 675         /* copy to user if data and response */
 676         for (i = 0; i < num_of_cmds && !err; i++)
 677                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 678
 679 cmd_done:
 680         mmc_blk_put(md);
 681 cmd_err:
 682         for (i = 0; i < num_of_cmds; i++) {
 683                 kfree(idata[i]->buf);
 684                 kfree(idata[i]);
 685         }
 686         kfree(idata);
 687         return ioc_err ? ioc_err : err;
 688 }
 689
 690 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 691         unsigned int cmd, unsigned long arg)
 692 {
 693         switch (cmd) {
 694         case MMC_IOC_CMD:
 695                 return mmc_blk_ioctl_cmd(bdev,
 696                                 (struct mmc_ioc_cmd __user *)arg);
 697         case MMC_IOC_MULTI_CMD:
 698                 return mmc_blk_ioctl_multi_cmd(bdev,
 699                                 (struct mmc_ioc_multi_cmd __user *)arg);
 700         default:
 701                 return -EINVAL;
 702         }
 703 }
 704
 705 #ifdef CONFIG_COMPAT
 706 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 707         unsigned int cmd, unsigned long arg)
 708 {
 709         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 710 }
 711 #endif
 712
 713 static const struct block_device_operations mmc_bdops = {
 714         .open                   = mmc_blk_open,
 715         .release                = mmc_blk_release,
 716         .getgeo                 = mmc_blk_getgeo,
 717         .owner                  = THIS_MODULE,
 718         .ioctl                  = mmc_blk_ioctl,
 719 #ifdef CONFIG_COMPAT
 720         .compat_ioctl           = mmc_blk_compat_ioctl,
 721 #endif
 722 };
 723
 724 static inline int mmc_blk_part_switch(struct mmc_card *card,
 725                                       struct mmc_blk_data *md)
 726 {
 727         int ret;
 728         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 729
 730         if (main_md->part_curr == md->part_type)
 731                 return 0;
 732
 733         if (mmc_card_mmc(card)) {
 734                 u8 part_config = card->ext_csd.part_config;
 735
 736                 if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 737                         mmc_retune_pause(card->host);
 738
 739                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 740                 part_config |= md->part_type;
 741
 742                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 743                                  EXT_CSD_PART_CONFIG, part_config,
 744                                  card->ext_csd.part_time);
 745                 if (ret) {
 746                         if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 747                                 mmc_retune_unpause(card->host);
 748                         return ret;
 749                 }
 750
 751                 card->ext_csd.part_config = part_config;
 752
 753                 if (main_md->part_curr == EXT_CSD_PART_CONFIG_ACC_RPMB)
 754                         mmc_retune_unpause(card->host);
 755         }
 756
 757         main_md->part_curr = md->part_type;
 758         return 0;
 759 }
 760
 761 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
 762 {
 763         int err;
 764         u32 result;
 765         __be32 *blocks;
 766
 767         struct mmc_request mrq = {};
 768         struct mmc_command cmd = {};
 769         struct mmc_data data = {};
 770
 771         struct scatterlist sg;
 772
 773         cmd.opcode = MMC_APP_CMD;
 774         cmd.arg = card->rca << 16;
 775         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 776
 777         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 778         if (err)
 779                 return err;
 780         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 781                 return -EIO;
 782
 783         memset(&cmd, 0, sizeof(struct mmc_command));
 784
 785         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 786         cmd.arg = 0;
 787         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 788
 789         data.blksz = 4;
 790         data.blocks = 1;
 791         data.flags = MMC_DATA_READ;
 792         data.sg = &sg;
 793         data.sg_len = 1;
 794         mmc_set_data_timeout(&data, card);
 795
 796         mrq.cmd = &cmd;
 797         mrq.data = &data;
 798
 799         blocks = kmalloc(4, GFP_KERNEL);
 800         if (!blocks)
 801                 return -ENOMEM;
 802
 803         sg_init_one(&sg, blocks, 4);
 804
 805         mmc_wait_for_req(card->host, &mrq);
 806
 807         result = ntohl(*blocks);
 808         kfree(blocks);
 809
 810         if (cmd.error || data.error)
 811                 return -EIO;
 812
 813         *written_blocks = result;
 814
 815         return 0;
 816 }
 817
 818 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 819 {
 820         struct mmc_command cmd = {};
 821         int err;
 822
 823         cmd.opcode = MMC_SEND_STATUS;
 824         if (!mmc_host_is_spi(card->host))
 825                 cmd.arg = card->rca << 16;
 826         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 827         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 828         if (err == 0)
 829                 *status = cmd.resp[0];
 830         return err;
 831 }
 832
 833 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 834                 bool hw_busy_detect, struct request *req, bool *gen_err)
 835 {
 836         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 837         int err = 0;
 838         u32 status;
 839
 840         do {
 841                 err = get_card_status(card, &status, 5);
 842                 if (err) {
 843                         pr_err("%s: error %d requesting status\n",
 844                                req->rq_disk->disk_name, err);
 845                         return err;
 846                 }
 847
 848                 if (status & R1_ERROR) {
 849                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 850                                 req->rq_disk->disk_name, __func__, status);
 851                         *gen_err = true;
 852                 }
 853
 854                 /* We may rely on the host hw to handle busy detection.*/
 855                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 856                         hw_busy_detect)
 857                         break;
 858
 859                 /*
 860                  * Timeout if the device never becomes ready for data and never
 861                  * leaves the program state.
 862                  */
 863                 if (time_after(jiffies, timeout)) {
 864                         pr_err("%s: Card stuck in programming state! %s %s\n",
 865                                 mmc_hostname(card->host),
 866                                 req->rq_disk->disk_name, __func__);
 867                         return -ETIMEDOUT;
 868                 }
 869
 870                 /*
 871                  * Some cards mishandle the status bits,
 872                  * so make sure to check both the busy
 873                  * indication and the card state.
 874                  */
 875         } while (!(status & R1_READY_FOR_DATA) ||
 876                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 877
 878         return err;
 879 }
 880
 881 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 882                 struct request *req, bool *gen_err, u32 *stop_status)
 883 {
 884         struct mmc_host *host = card->host;
 885         struct mmc_command cmd = {};
 886         int err;
 887         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 888
 889         /*
 890          * Normally we use R1B responses for WRITE, but in cases where the host
 891          * has specified a max_busy_timeout we need to validate it. A failure
 892          * means we need to prevent the host from doing hw busy detection, which
 893          * is done by converting to a R1 response instead.
 894          */
 895         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 896                 use_r1b_resp = false;
 897
 898         cmd.opcode = MMC_STOP_TRANSMISSION;
 899         if (use_r1b_resp) {
 900                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 901                 cmd.busy_timeout = timeout_ms;
 902         } else {
 903                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 904         }
 905
 906         err = mmc_wait_for_cmd(host, &cmd, 5);
 907         if (err)
 908                 return err;
 909
 910         *stop_status = cmd.resp[0];
 911
 912         /* No need to check card status in case of READ. */
 913         if (rq_data_dir(req) == READ)
 914                 return 0;
 915
 916         if (!mmc_host_is_spi(host) &&
 917                 (*stop_status & R1_ERROR)) {
 918                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 919                         req->rq_disk->disk_name, __func__, *stop_status);
 920                 *gen_err = true;
 921         }
 922
 923         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 924 }
 925
 926 #define ERR_NOMEDIUM    3
 927 #define ERR_RETRY       2
 928 #define ERR_ABORT       1
 929 #define ERR_CONTINUE    0
 930
 931 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 932         bool status_valid, u32 status)
 933 {
 934         switch (error) {
 935         case -EILSEQ:
 936                 /* response crc error, retry the r/w cmd */
 937                 pr_err("%s: %s sending %s command, card status %#x\n",
 938                         req->rq_disk->disk_name, "response CRC error",
 939                         name, status);
 940                 return ERR_RETRY;
 941
 942         case -ETIMEDOUT:
 943                 pr_err("%s: %s sending %s command, card status %#x\n",
 944                         req->rq_disk->disk_name, "timed out", name, status);
 945
 946                 /* If the status cmd initially failed, retry the r/w cmd */
 947                 if (!status_valid) {
 948                         pr_err("%s: status not valid, retrying timeout\n",
 949                                 req->rq_disk->disk_name);
 950                         return ERR_RETRY;
 951                 }
 952
 953                 /*
 954                  * If it was a r/w cmd crc error, or illegal command
 955                  * (eg, issued in wrong state) then retry - we should
 956                  * have corrected the state problem above.
 957                  */
 958                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 959                         pr_err("%s: command error, retrying timeout\n",
 960                                 req->rq_disk->disk_name);
 961                         return ERR_RETRY;
 962                 }
 963
 964                 /* Otherwise abort the command */
 965                 return ERR_ABORT;
 966
 967         default:
 968                 /* We don't understand the error code the driver gave us */
 969                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 970                        req->rq_disk->disk_name, error, status);
 971                 return ERR_ABORT;
 972         }
 973 }
 974
 975 /*
 976  * Initial r/w and stop cmd error recovery.
 977  * We don't know whether the card received the r/w cmd or not, so try to
 978  * restore things back to a sane state.  Essentially, we do this as follows:
 979  * - Obtain card status.  If the first attempt to obtain card status fails,
 980  *   the status word will reflect the failed status cmd, not the failed
 981  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 982  *   longer communicate with the card.
 983  * - Check the card state.  If the card received the cmd but there was a
 984  *   transient problem with the response, it might still be in a data transfer
 985  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 986  * - If the r/w cmd failed due to a response CRC error, it was probably
 987  *   transient, so retry the cmd.
 988  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 989  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 990  *   illegal cmd, retry.
 991  * Otherwise we don't understand what happened, so abort.
 992  */
 993 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 994         struct mmc_blk_request *brq, bool *ecc_err, bool *gen_err)
 995 {
 996         bool prev_cmd_status_valid = true;
 997         u32 status, stop_status = 0;
 998         int err, retry;
 999
1000         if (mmc_card_removed(card))
1001                 return ERR_NOMEDIUM;
1002
1003         /*
1004          * Try to get card status which indicates both the card state
1005          * and why there was no response.  If the first attempt fails,
1006          * we can't be sure the returned status is for the r/w command.
1007          */
1008         for (retry = 2; retry >= 0; retry--) {
1009                 err = get_card_status(card, &status, 0);
1010                 if (!err)
1011                         break;
1012
1013                 /* Re-tune if needed */
1014                 mmc_retune_recheck(card->host);
1015
1016                 prev_cmd_status_valid = false;
1017                 pr_err("%s: error %d sending status command, %sing\n",
1018                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1019         }
1020
1021         /* We couldn't get a response from the card.  Give up. */
1022         if (err) {
1023                 /* Check if the card is removed */
1024                 if (mmc_detect_card_removed(card->host))
1025                         return ERR_NOMEDIUM;
1026                 return ERR_ABORT;
1027         }
1028
1029         /* Flag ECC errors */
1030         if ((status & R1_CARD_ECC_FAILED) ||
1031             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1032             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1033                 *ecc_err = true;
1034
1035         /* Flag General errors */
1036         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1037                 if ((status & R1_ERROR) ||
1038                         (brq->stop.resp[0] & R1_ERROR)) {
1039                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1040                                req->rq_disk->disk_name, __func__,
1041                                brq->stop.resp[0], status);
1042                         *gen_err = true;
1043                 }
1044
1045         /*
1046          * Check the current card state.  If it is in some data transfer
1047          * mode, tell it to stop (and hopefully transition back to TRAN.)
1048          */
1049         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1050             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1051                 err = send_stop(card,
1052                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1053                         req, gen_err, &stop_status);
1054                 if (err) {
1055                         pr_err("%s: error %d sending stop command\n",
1056                                req->rq_disk->disk_name, err);
1057                         /*
1058                          * If the stop cmd also timed out, the card is probably
1059                          * not present, so abort. Other errors are bad news too.
1060                          */
1061                         return ERR_ABORT;
1062                 }
1063
1064                 if (stop_status & R1_CARD_ECC_FAILED)
1065                         *ecc_err = true;
1066         }
1067
1068         /* Check for set block count errors */
1069         if (brq->sbc.error)
1070                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1071                                 prev_cmd_status_valid, status);
1072
1073         /* Check for r/w command errors */
1074         if (brq->cmd.error)
1075                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1076                                 prev_cmd_status_valid, status);
1077
1078         /* Data errors */
1079         if (!brq->stop.error)
1080                 return ERR_CONTINUE;
1081
1082         /* Now for stop errors.  These aren't fatal to the transfer. */
1083         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1084                req->rq_disk->disk_name, brq->stop.error,
1085                brq->cmd.resp[0], status);
1086
1087         /*
1088          * Subsitute in our own stop status as this will give the error
1089          * state which happened during the execution of the r/w command.
1090          */
1091         if (stop_status) {
1092                 brq->stop.resp[0] = stop_status;
1093                 brq->stop.error = 0;
1094         }
1095         return ERR_CONTINUE;
1096 }
1097
1098 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1099                          int type)
1100 {
1101         int err;
1102
1103         if (md->reset_done & type)
1104                 return -EEXIST;
1105
1106         md->reset_done |= type;
1107         err = mmc_hw_reset(host);
1108         /* Ensure we switch back to the correct partition */
1109         if (err != -EOPNOTSUPP) {
1110                 struct mmc_blk_data *main_md =
1111                         dev_get_drvdata(&host->card->dev);
1112                 int part_err;
1113
1114                 main_md->part_curr = main_md->part_type;
1115                 part_err = mmc_blk_part_switch(host->card, md);
1116                 if (part_err) {
1117                         /*
1118                          * We have failed to get back into the correct
1119                          * partition, so we need to abort the whole request.
1120                          */
1121                         return -ENODEV;
1122                 }
1123         }
1124         return err;
1125 }
1126
1127 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1128 {
1129         md->reset_done &= ~type;
1130 }
1131
1132 int mmc_access_rpmb(struct mmc_queue *mq)
1133 {
1134         struct mmc_blk_data *md = mq->blkdata;
1135         /*
1136          * If this is a RPMB partition access, return ture
1137          */
1138         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1139                 return true;
1140
1141         return false;
1142 }
1143
1144 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1145 {
1146         struct mmc_blk_data *md = mq->blkdata;
1147         struct mmc_card *card = md->queue.card;
1148         unsigned int from, nr, arg;
1149         int err = 0, type = MMC_BLK_DISCARD;
1150
1151         if (!mmc_can_erase(card)) {
1152                 err = -EOPNOTSUPP;
1153                 goto fail;
1154         }
1155
1156         from = blk_rq_pos(req);
1157         nr = blk_rq_sectors(req);
1158
1159         if (mmc_can_discard(card))
1160                 arg = MMC_DISCARD_ARG;
1161         else if (mmc_can_trim(card))
1162                 arg = MMC_TRIM_ARG;
1163         else
1164                 arg = MMC_ERASE_ARG;
1165         do {
1166                 err = 0;
1167                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1168                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1169                                          INAND_CMD38_ARG_EXT_CSD,
1170                                          arg == MMC_TRIM_ARG ?
1171                                          INAND_CMD38_ARG_TRIM :
1172                                          INAND_CMD38_ARG_ERASE,
1173                                          0);
1174                 }
1175                 if (!err)
1176                         err = mmc_erase(card, from, nr, arg);
1177         } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1178         if (!err)
1179                 mmc_blk_reset_success(md, type);
1180 fail:
1181         blk_end_request(req, err, blk_rq_bytes(req));
1182 }
1183
1184 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1185                                        struct request *req)
1186 {
1187         struct mmc_blk_data *md = mq->blkdata;
1188         struct mmc_card *card = md->queue.card;
1189         unsigned int from, nr, arg;
1190         int err = 0, type = MMC_BLK_SECDISCARD;
1191
1192         if (!(mmc_can_secure_erase_trim(card))) {
1193                 err = -EOPNOTSUPP;
1194                 goto out;
1195         }
1196
1197         from = blk_rq_pos(req);
1198         nr = blk_rq_sectors(req);
1199
1200         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1201                 arg = MMC_SECURE_TRIM1_ARG;
1202         else
1203                 arg = MMC_SECURE_ERASE_ARG;
1204
1205 retry:
1206         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1207                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1208                                  INAND_CMD38_ARG_EXT_CSD,
1209                                  arg == MMC_SECURE_TRIM1_ARG ?
1210                                  INAND_CMD38_ARG_SECTRIM1 :
1211                                  INAND_CMD38_ARG_SECERASE,
1212                                  0);
1213                 if (err)
1214                         goto out_retry;
1215         }
1216
1217         err = mmc_erase(card, from, nr, arg);
1218         if (err == -EIO)
1219                 goto out_retry;
1220         if (err)
1221                 goto out;
1222
1223         if (arg == MMC_SECURE_TRIM1_ARG) {
1224                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1225                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1226                                          INAND_CMD38_ARG_EXT_CSD,
1227                                          INAND_CMD38_ARG_SECTRIM2,
1228                                          0);
1229                         if (err)
1230                                 goto out_retry;
1231                 }
1232
1233                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1234                 if (err == -EIO)
1235                         goto out_retry;
1236                 if (err)
1237                         goto out;
1238         }
1239
1240 out_retry:
1241         if (err && !mmc_blk_reset(md, card->host, type))
1242                 goto retry;
1243         if (!err)
1244                 mmc_blk_reset_success(md, type);
1245 out:
1246         blk_end_request(req, err, blk_rq_bytes(req));
1247 }
1248
1249 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1250 {
1251         struct mmc_blk_data *md = mq->blkdata;
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
1262 /*
1263  * Reformat current write as a reliable write, supporting
1264  * both legacy and the enhanced reliable write MMC cards.
1265  * In each transfer we'll handle only as much as a single
1266  * reliable write can handle, thus finish the request in
1267  * partial completions.
1268  */
1269 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1270                                     struct mmc_card *card,
1271                                     struct request *req)
1272 {
1273         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1274                 /* Legacy mode imposes restrictions on transfers. */
1275                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1276                         brq->data.blocks = 1;
1277
1278                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1279                         brq->data.blocks = card->ext_csd.rel_sectors;
1280                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1281                         brq->data.blocks = 1;
1282         }
1283 }
1284
1285 #define CMD_ERRORS                                                      \
1286         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1287          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1288          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1289          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1290          R1_CC_ERROR |          /* Card controller error */             \
1291          R1_ERROR)              /* General/unknown error */
1292
1293 static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
1294                                              struct mmc_async_req *areq)
1295 {
1296         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1297                                                     areq);
1298         struct mmc_blk_request *brq = &mq_mrq->brq;
1299         struct request *req = mq_mrq->req;
1300         int need_retune = card->host->need_retune;
1301         bool ecc_err = false;
1302         bool gen_err = false;
1303
1304         /*
1305          * sbc.error indicates a problem with the set block count
1306          * command.  No data will have been transferred.
1307          *
1308          * cmd.error indicates a problem with the r/w command.  No
1309          * data will have been transferred.
1310          *
1311          * stop.error indicates a problem with the stop command.  Data
1312          * may have been transferred, or may still be transferring.
1313          */
1314         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1315             brq->data.error) {
1316                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1317                 case ERR_RETRY:
1318                         return MMC_BLK_RETRY;
1319                 case ERR_ABORT:
1320                         return MMC_BLK_ABORT;
1321                 case ERR_NOMEDIUM:
1322                         return MMC_BLK_NOMEDIUM;
1323                 case ERR_CONTINUE:
1324                         break;
1325                 }
1326         }
1327
1328         /*
1329          * Check for errors relating to the execution of the
1330          * initial command - such as address errors.  No data
1331          * has been transferred.
1332          */
1333         if (brq->cmd.resp[0] & CMD_ERRORS) {
1334                 pr_err("%s: r/w command failed, status = %#x\n",
1335                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1336                 return MMC_BLK_ABORT;
1337         }
1338
1339         /*
1340          * Everything else is either success, or a data error of some
1341          * kind.  If it was a write, we may have transitioned to
1342          * program mode, which we have to wait for it to complete.
1343          */
1344         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1345                 int err;
1346
1347                 /* Check stop command response */
1348                 if (brq->stop.resp[0] & R1_ERROR) {
1349                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1350                                req->rq_disk->disk_name, __func__,
1351                                brq->stop.resp[0]);
1352                         gen_err = true;
1353                 }
1354
1355                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1356                                         &gen_err);
1357                 if (err)
1358                         return MMC_BLK_CMD_ERR;
1359         }
1360
1361         /* if general error occurs, retry the write operation. */
1362         if (gen_err) {
1363                 pr_warn("%s: retrying write for general error\n",
1364                                 req->rq_disk->disk_name);
1365                 return MMC_BLK_RETRY;
1366         }
1367
1368         if (brq->data.error) {
1369                 if (need_retune && !brq->retune_retry_done) {
1370                         pr_debug("%s: retrying because a re-tune was needed\n",
1371                                  req->rq_disk->disk_name);
1372                         brq->retune_retry_done = 1;
1373                         return MMC_BLK_RETRY;
1374                 }
1375                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1376                        req->rq_disk->disk_name, brq->data.error,
1377                        (unsigned)blk_rq_pos(req),
1378                        (unsigned)blk_rq_sectors(req),
1379                        brq->cmd.resp[0], brq->stop.resp[0]);
1380
1381                 if (rq_data_dir(req) == READ) {
1382                         if (ecc_err)
1383                                 return MMC_BLK_ECC_ERR;
1384                         return MMC_BLK_DATA_ERR;
1385                 } else {
1386                         return MMC_BLK_CMD_ERR;
1387                 }
1388         }
1389
1390         if (!brq->data.bytes_xfered)
1391                 return MMC_BLK_RETRY;
1392
1393         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1394                 return MMC_BLK_PARTIAL;
1395
1396         return MMC_BLK_SUCCESS;
1397 }
1398
1399 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1400                                struct mmc_card *card,
1401                                int disable_multi,
1402                                struct mmc_queue *mq)
1403 {
1404         u32 readcmd, writecmd;
1405         struct mmc_blk_request *brq = &mqrq->brq;
1406         struct request *req = mqrq->req;
1407         struct mmc_blk_data *md = mq->blkdata;
1408         bool do_data_tag;
1409
1410         /*
1411          * Reliable writes are used to implement Forced Unit Access and
1412          * are supported only on MMCs.
1413          */
1414         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1415                 (rq_data_dir(req) == WRITE) &&
1416                 (md->flags & MMC_BLK_REL_WR);
1417
1418         memset(brq, 0, sizeof(struct mmc_blk_request));
1419         brq->mrq.cmd = &brq->cmd;
1420         brq->mrq.data = &brq->data;
1421
1422         brq->cmd.arg = blk_rq_pos(req);
1423         if (!mmc_card_blockaddr(card))
1424                 brq->cmd.arg <<= 9;
1425         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1426         brq->data.blksz = 512;
1427         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1428         brq->stop.arg = 0;
1429         brq->data.blocks = blk_rq_sectors(req);
1430
1431         /*
1432          * The block layer doesn't support all sector count
1433          * restrictions, so we need to be prepared for too big
1434          * requests.
1435          */
1436         if (brq->data.blocks > card->host->max_blk_count)
1437                 brq->data.blocks = card->host->max_blk_count;
1438
1439         if (brq->data.blocks > 1) {
1440                 /*
1441                  * After a read error, we redo the request one sector
1442                  * at a time in order to accurately determine which
1443                  * sectors can be read successfully.
1444                  */
1445                 if (disable_multi)
1446                         brq->data.blocks = 1;
1447
1448                 /*
1449                  * Some controllers have HW issues while operating
1450                  * in multiple I/O mode
1451                  */
1452                 if (card->host->ops->multi_io_quirk)
1453                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1454                                                 (rq_data_dir(req) == READ) ?
1455                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1456                                                 brq->data.blocks);
1457         }
1458
1459         if (brq->data.blocks > 1 || do_rel_wr) {
1460                 /* SPI multiblock writes terminate using a special
1461                  * token, not a STOP_TRANSMISSION request.
1462                  */
1463                 if (!mmc_host_is_spi(card->host) ||
1464                     rq_data_dir(req) == READ)
1465                         brq->mrq.stop = &brq->stop;
1466                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1467                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1468         } else {
1469                 brq->mrq.stop = NULL;
1470                 readcmd = MMC_READ_SINGLE_BLOCK;
1471                 writecmd = MMC_WRITE_BLOCK;
1472         }
1473         if (rq_data_dir(req) == READ) {
1474                 brq->cmd.opcode = readcmd;
1475                 brq->data.flags = MMC_DATA_READ;
1476                 if (brq->mrq.stop)
1477                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1478                                         MMC_CMD_AC;
1479         } else {
1480                 brq->cmd.opcode = writecmd;
1481                 brq->data.flags = MMC_DATA_WRITE;
1482                 if (brq->mrq.stop)
1483                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1484                                         MMC_CMD_AC;
1485         }
1486
1487         if (do_rel_wr)
1488                 mmc_apply_rel_rw(brq, card, req);
1489
1490         /*
1491          * Data tag is used only during writing meta data to speed
1492          * up write and any subsequent read of this meta data
1493          */
1494         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1495                 (req->cmd_flags & REQ_META) &&
1496                 (rq_data_dir(req) == WRITE) &&
1497                 ((brq->data.blocks * brq->data.blksz) >=
1498                  card->ext_csd.data_tag_unit_size);
1499
1500         /*
1501          * Pre-defined multi-block transfers are preferable to
1502          * open ended-ones (and necessary for reliable writes).
1503          * However, it is not sufficient to just send CMD23,
1504          * and avoid the final CMD12, as on an error condition
1505          * CMD12 (stop) needs to be sent anyway. This, coupled
1506          * with Auto-CMD23 enhancements provided by some
1507          * hosts, means that the complexity of dealing
1508          * with this is best left to the host. If CMD23 is
1509          * supported by card and host, we'll fill sbc in and let
1510          * the host deal with handling it correctly. This means
1511          * that for hosts that don't expose MMC_CAP_CMD23, no
1512          * change of behavior will be observed.
1513          *
1514          * N.B: Some MMC cards experience perf degradation.
1515          * We'll avoid using CMD23-bounded multiblock writes for
1516          * these, while retaining features like reliable writes.
1517          */
1518         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1519             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1520              do_data_tag)) {
1521                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1522                 brq->sbc.arg = brq->data.blocks |
1523                         (do_rel_wr ? (1 << 31) : 0) |
1524                         (do_data_tag ? (1 << 29) : 0);
1525                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1526                 brq->mrq.sbc = &brq->sbc;
1527         }
1528
1529         mmc_set_data_timeout(&brq->data, card);
1530
1531         brq->data.sg = mqrq->sg;
1532         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1533
1534         /*
1535          * Adjust the sg list so it is the same size as the
1536          * request.
1537          */
1538         if (brq->data.blocks != blk_rq_sectors(req)) {
1539                 int i, data_size = brq->data.blocks << 9;
1540                 struct scatterlist *sg;
1541
1542                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1543                         data_size -= sg->length;
1544                         if (data_size <= 0) {
1545                                 sg->length += data_size;
1546                                 i++;
1547                                 break;
1548                         }
1549                 }
1550                 brq->data.sg_len = i;
1551         }
1552
1553         mqrq->areq.mrq = &brq->mrq;
1554         mqrq->areq.err_check = mmc_blk_err_check;
1555
1556         mmc_queue_bounce_pre(mqrq);
1557 }
1558
1559 static bool mmc_blk_rw_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1560                                struct mmc_blk_request *brq, struct request *req,
1561                                bool old_req_pending)
1562 {
1563         bool req_pending;
1564
1565         /*
1566          * If this is an SD card and we're writing, we can first
1567          * mark the known good sectors as ok.
1568          *
1569          * If the card is not SD, we can still ok written sectors
1570          * as reported by the controller (which might be less than
1571          * the real number of written sectors, but never more).
1572          */
1573         if (mmc_card_sd(card)) {
1574                 u32 blocks;
1575                 int err;
1576
1577                 err = mmc_sd_num_wr_blocks(card, &blocks);
1578                 if (err)
1579                         req_pending = old_req_pending;
1580                 else
1581                         req_pending = blk_end_request(req, 0, blocks << 9);
1582         } else {
1583                 req_pending = blk_end_request(req, 0, brq->data.bytes_xfered);
1584         }
1585         return req_pending;
1586 }
1587
1588 static void mmc_blk_rw_cmd_abort(struct mmc_card *card, struct request *req)
1589 {
1590         if (mmc_card_removed(card))
1591                 req->rq_flags |= RQF_QUIET;
1592         while (blk_end_request(req, -EIO, blk_rq_cur_bytes(req)));
1593 }
1594
1595 /**
1596  * mmc_blk_rw_try_restart() - tries to restart the current async request
1597  * @mq: the queue with the card and host to restart
1598  * @req: a new request that want to be started after the current one
1599  */
1600 static void mmc_blk_rw_try_restart(struct mmc_queue *mq, struct request *req)
1601 {
1602         if (!req)
1603                 return;
1604
1605         /*
1606          * If the card was removed, just cancel everything and return.
1607          */
1608         if (mmc_card_removed(mq->card)) {
1609                 req->rq_flags |= RQF_QUIET;
1610                 blk_end_request_all(req, -EIO);
1611                 return;
1612         }
1613         /* Else proceed and try to restart the current async request */
1614         mmc_blk_rw_rq_prep(mq->mqrq_cur, mq->card, 0, mq);
1615         mmc_start_areq(mq->card->host, &mq->mqrq_cur->areq, NULL);
1616 }
1617
1618 static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
1619 {
1620         struct mmc_blk_data *md = mq->blkdata;
1621         struct mmc_card *card = md->queue.card;
1622         struct mmc_blk_request *brq;
1623         int disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1624         enum mmc_blk_status status;
1625         struct mmc_queue_req *mq_rq;
1626         struct request *old_req;
1627         struct mmc_async_req *new_areq;
1628         struct mmc_async_req *old_areq;
1629         bool req_pending = true;
1630
1631         if (!new_req && !mq->mqrq_prev->req)
1632                 return;
1633
1634         do {
1635                 if (new_req) {
1636                         /*
1637                          * When 4KB native sector is enabled, only 8 blocks
1638                          * multiple read or write is allowed
1639                          */
1640                         if (mmc_large_sector(card) &&
1641                                 !IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
1642                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1643                                         new_req->rq_disk->disk_name);
1644                                 mmc_blk_rw_cmd_abort(card, new_req);
1645                                 return;
1646                         }
1647
1648                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1649                         new_areq = &mq->mqrq_cur->areq;
1650                 } else
1651                         new_areq = NULL;
1652
1653                 old_areq = mmc_start_areq(card->host, new_areq, &status);
1654                 if (!old_areq) {
1655                         /*
1656                          * We have just put the first request into the pipeline
1657                          * and there is nothing more to do until it is
1658                          * complete.
1659                          */
1660                         if (status == MMC_BLK_NEW_REQUEST)
1661                                 mq->new_request = true;
1662                         return;
1663                 }
1664
1665                 /*
1666                  * An asynchronous request has been completed and we proceed
1667                  * to handle the result of it.
1668                  */
1669                 mq_rq = container_of(old_areq, struct mmc_queue_req, areq);
1670                 brq = &mq_rq->brq;
1671                 old_req = mq_rq->req;
1672                 type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1673                 mmc_queue_bounce_post(mq_rq);
1674
1675                 switch (status) {
1676                 case MMC_BLK_SUCCESS:
1677                 case MMC_BLK_PARTIAL:
1678                         /*
1679                          * A block was successfully transferred.
1680                          */
1681                         mmc_blk_reset_success(md, type);
1682
1683                         req_pending = blk_end_request(old_req, 0,
1684                                                       brq->data.bytes_xfered);
1685                         /*
1686                          * If the blk_end_request function returns non-zero even
1687                          * though all data has been transferred and no errors
1688                          * were returned by the host controller, it's a bug.
1689                          */
1690                         if (status == MMC_BLK_SUCCESS && req_pending) {
1691                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1692                                        __func__, blk_rq_bytes(old_req),
1693                                        brq->data.bytes_xfered);
1694                                 mmc_blk_rw_cmd_abort(card, old_req);
1695                                 return;
1696                         }
1697                         break;
1698                 case MMC_BLK_CMD_ERR:
1699                         req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
1700                         if (mmc_blk_reset(md, card->host, type)) {
1701                                 if (req_pending)
1702                                         mmc_blk_rw_cmd_abort(card, old_req);
1703                                 mmc_blk_rw_try_restart(mq, new_req);
1704                                 return;
1705                         }
1706                         if (!req_pending) {
1707                                 mmc_blk_rw_try_restart(mq, new_req);
1708                                 return;
1709                         }
1710                         break;
1711                 case MMC_BLK_RETRY:
1712                         retune_retry_done = brq->retune_retry_done;
1713                         if (retry++ < 5)
1714                                 break;
1715                         /* Fall through */
1716                 case MMC_BLK_ABORT:
1717                         if (!mmc_blk_reset(md, card->host, type))
1718                                 break;
1719                         mmc_blk_rw_cmd_abort(card, old_req);
1720                         mmc_blk_rw_try_restart(mq, new_req);
1721                         return;
1722                 case MMC_BLK_DATA_ERR: {
1723                         int err;
1724
1725                         err = mmc_blk_reset(md, card->host, type);
1726                         if (!err)
1727                                 break;
1728                         if (err == -ENODEV) {
1729                                 mmc_blk_rw_cmd_abort(card, old_req);
1730                                 mmc_blk_rw_try_restart(mq, new_req);
1731                                 return;
1732                         }
1733                         /* Fall through */
1734                 }
1735                 case MMC_BLK_ECC_ERR:
1736                         if (brq->data.blocks > 1) {
1737                                 /* Redo read one sector at a time */
1738                                 pr_warn("%s: retrying using single block read\n",
1739                                         old_req->rq_disk->disk_name);
1740                                 disable_multi = 1;
1741                                 break;
1742                         }
1743                         /*
1744                          * After an error, we redo I/O one sector at a
1745                          * time, so we only reach here after trying to
1746                          * read a single sector.
1747                          */
1748                         req_pending = blk_end_request(old_req, -EIO,
1749                                                       brq->data.blksz);
1750                         if (!req_pending) {
1751                                 mmc_blk_rw_try_restart(mq, new_req);
1752                                 return;
1753                         }
1754                         break;
1755                 case MMC_BLK_NOMEDIUM:
1756                         mmc_blk_rw_cmd_abort(card, old_req);
1757                         mmc_blk_rw_try_restart(mq, new_req);
1758                         return;
1759                 default:
1760                         pr_err("%s: Unhandled return value (%d)",
1761                                         old_req->rq_disk->disk_name, status);
1762                         mmc_blk_rw_cmd_abort(card, old_req);
1763                         mmc_blk_rw_try_restart(mq, new_req);
1764                         return;
1765                 }
1766
1767                 if (req_pending) {
1768                         /*
1769                          * In case of a incomplete request
1770                          * prepare it again and resend.
1771                          */
1772                         mmc_blk_rw_rq_prep(mq_rq, card,
1773                                         disable_multi, mq);
1774                         mmc_start_areq(card->host,
1775                                         &mq_rq->areq, NULL);
1776                         mq_rq->brq.retune_retry_done = retune_retry_done;
1777                 }
1778         } while (req_pending);
1779 }
1780
1781 void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1782 {
1783         int ret;
1784         struct mmc_blk_data *md = mq->blkdata;
1785         struct mmc_card *card = md->queue.card;
1786         bool req_is_special = mmc_req_is_special(req);
1787
1788         if (req && !mq->mqrq_prev->req)
1789                 /* claim host only for the first request */
1790                 mmc_get_card(card);
1791
1792         ret = mmc_blk_part_switch(card, md);
1793         if (ret) {
1794                 if (req) {
1795                         blk_end_request_all(req, -EIO);
1796                 }
1797                 goto out;
1798         }
1799
1800         mq->new_request = false;
1801         if (req && req_op(req) == REQ_OP_DISCARD) {
1802                 /* complete ongoing async transfer before issuing discard */
1803                 if (card->host->areq)
1804                         mmc_blk_issue_rw_rq(mq, NULL);
1805                 mmc_blk_issue_discard_rq(mq, req);
1806         } else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {
1807                 /* complete ongoing async transfer before issuing secure erase*/
1808                 if (card->host->areq)
1809                         mmc_blk_issue_rw_rq(mq, NULL);
1810                 mmc_blk_issue_secdiscard_rq(mq, req);
1811         } else if (req && req_op(req) == REQ_OP_FLUSH) {
1812                 /* complete ongoing async transfer before issuing flush */
1813                 if (card->host->areq)
1814                         mmc_blk_issue_rw_rq(mq, NULL);
1815                 mmc_blk_issue_flush(mq, req);
1816         } else {
1817                 mmc_blk_issue_rw_rq(mq, req);
1818                 card->host->context_info.is_waiting_last_req = false;
1819         }
1820
1821 out:
1822         if ((!req && !mq->new_request) || req_is_special)
1823                 /*
1824                  * Release host when there are no more requests
1825                  * and after special request(discard, flush) is done.
1826                  * In case sepecial request, there is no reentry to
1827                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
1828                  */
1829                 mmc_put_card(card);
1830 }
1831
1832 static inline int mmc_blk_readonly(struct mmc_card *card)
1833 {
1834         return mmc_card_readonly(card) ||
1835                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1836 }
1837
1838 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1839                                               struct device *parent,
1840                                               sector_t size,
1841                                               bool default_ro,
1842                                               const char *subname,
1843                                               int area_type)
1844 {
1845         struct mmc_blk_data *md;
1846         int devidx, ret;
1847
1848         devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
1849         if (devidx < 0)
1850                 return ERR_PTR(devidx);
1851
1852         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1853         if (!md) {
1854                 ret = -ENOMEM;
1855                 goto out;
1856         }
1857
1858         md->area_type = area_type;
1859
1860         /*
1861          * Set the read-only status based on the supported commands
1862          * and the write protect switch.
1863          */
1864         md->read_only = mmc_blk_readonly(card);
1865
1866         md->disk = alloc_disk(perdev_minors);
1867         if (md->disk == NULL) {
1868                 ret = -ENOMEM;
1869                 goto err_kfree;
1870         }
1871
1872         spin_lock_init(&md->lock);
1873         INIT_LIST_HEAD(&md->part);
1874         md->usage = 1;
1875
1876         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1877         if (ret)
1878                 goto err_putdisk;
1879
1880         md->queue.blkdata = md;
1881
1882         md->disk->major = MMC_BLOCK_MAJOR;
1883         md->disk->first_minor = devidx * perdev_minors;
1884         md->disk->fops = &mmc_bdops;
1885         md->disk->private_data = md;
1886         md->disk->queue = md->queue.queue;
1887         md->parent = parent;
1888         set_disk_ro(md->disk, md->read_only || default_ro);
1889         md->disk->flags = GENHD_FL_EXT_DEVT;
1890         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
1891                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
1892
1893         /*
1894          * As discussed on lkml, GENHD_FL_REMOVABLE should:
1895          *
1896          * - be set for removable media with permanent block devices
1897          * - be unset for removable block devices with permanent media
1898          *
1899          * Since MMC block devices clearly fall under the second
1900          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
1901          * should use the block device creation/destruction hotplug
1902          * messages to tell when the card is present.
1903          */
1904
1905         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1906                  "mmcblk%u%s", card->host->index, subname ? subname : "");
1907
1908         if (mmc_card_mmc(card))
1909                 blk_queue_logical_block_size(md->queue.queue,
1910                                              card->ext_csd.data_sector_size);
1911         else
1912                 blk_queue_logical_block_size(md->queue.queue, 512);
1913
1914         set_capacity(md->disk, size);
1915
1916         if (mmc_host_cmd23(card->host)) {
1917                 if ((mmc_card_mmc(card) &&
1918                      card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
1919                     (mmc_card_sd(card) &&
1920                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1921                         md->flags |= MMC_BLK_CMD23;
1922         }
1923
1924         if (mmc_card_mmc(card) &&
1925             md->flags & MMC_BLK_CMD23 &&
1926             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1927              card->ext_csd.rel_sectors)) {
1928                 md->flags |= MMC_BLK_REL_WR;
1929                 blk_queue_write_cache(md->queue.queue, true, true);
1930         }
1931
1932         return md;
1933
1934  err_putdisk:
1935         put_disk(md->disk);
1936  err_kfree:
1937         kfree(md);
1938  out:
1939         ida_simple_remove(&mmc_blk_ida, devidx);
1940         return ERR_PTR(ret);
1941 }
1942
1943 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1944 {
1945         sector_t size;
1946
1947         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1948                 /*
1949                  * The EXT_CSD sector count is in number or 512 byte
1950                  * sectors.
1951                  */
1952                 size = card->ext_csd.sectors;
1953         } else {
1954                 /*
1955                  * The CSD capacity field is in units of read_blkbits.
1956                  * set_capacity takes units of 512 bytes.
1957                  */
1958                 size = (typeof(sector_t))card->csd.capacity
1959                         << (card->csd.read_blkbits - 9);
1960         }
1961
1962         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
1963                                         MMC_BLK_DATA_AREA_MAIN);
1964 }
1965
1966 static int mmc_blk_alloc_part(struct mmc_card *card,
1967                               struct mmc_blk_data *md,
1968                               unsigned int part_type,
1969                               sector_t size,
1970                               bool default_ro,
1971                               const char *subname,
1972                               int area_type)
1973 {
1974         char cap_str[10];
1975         struct mmc_blk_data *part_md;
1976
1977         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1978                                     subname, area_type);
1979         if (IS_ERR(part_md))
1980                 return PTR_ERR(part_md);
1981         part_md->part_type = part_type;
1982         list_add(&part_md->part, &md->part);
1983
1984         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
1985                         cap_str, sizeof(cap_str));
1986         pr_info("%s: %s %s partition %u %s\n",
1987                part_md->disk->disk_name, mmc_card_id(card),
1988                mmc_card_name(card), part_md->part_type, cap_str);
1989         return 0;
1990 }
1991
1992 /* MMC Physical partitions consist of two boot partitions and
1993  * up to four general purpose partitions.
1994  * For each partition enabled in EXT_CSD a block device will be allocatedi
1995  * to provide access to the partition.
1996  */
1997
1998 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1999 {
2000         int idx, ret = 0;
2001
2002         if (!mmc_card_mmc(card))
2003                 return 0;
2004
2005         for (idx = 0; idx < card->nr_parts; idx++) {
2006                 if (card->part[idx].size) {
2007                         ret = mmc_blk_alloc_part(card, md,
2008                                 card->part[idx].part_cfg,
2009                                 card->part[idx].size >> 9,
2010                                 card->part[idx].force_ro,
2011                                 card->part[idx].name,
2012                                 card->part[idx].area_type);
2013                         if (ret)
2014                                 return ret;
2015                 }
2016         }
2017
2018         return ret;
2019 }
2020
2021 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2022 {
2023         struct mmc_card *card;
2024
2025         if (md) {
2026                 /*
2027                  * Flush remaining requests and free queues. It
2028                  * is freeing the queue that stops new requests
2029                  * from being accepted.
2030                  */
2031                 card = md->queue.card;
2032                 mmc_cleanup_queue(&md->queue);
2033                 if (md->disk->flags & GENHD_FL_UP) {
2034                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2035                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2036                                         card->ext_csd.boot_ro_lockable)
2037                                 device_remove_file(disk_to_dev(md->disk),
2038                                         &md->power_ro_lock);
2039
2040                         del_gendisk(md->disk);
2041                 }
2042                 mmc_blk_put(md);
2043         }
2044 }
2045
2046 static void mmc_blk_remove_parts(struct mmc_card *card,
2047                                  struct mmc_blk_data *md)
2048 {
2049         struct list_head *pos, *q;
2050         struct mmc_blk_data *part_md;
2051
2052         list_for_each_safe(pos, q, &md->part) {
2053                 part_md = list_entry(pos, struct mmc_blk_data, part);
2054                 list_del(pos);
2055                 mmc_blk_remove_req(part_md);
2056         }
2057 }
2058
2059 static int mmc_add_disk(struct mmc_blk_data *md)
2060 {
2061         int ret;
2062         struct mmc_card *card = md->queue.card;
2063
2064         device_add_disk(md->parent, md->disk);
2065         md->force_ro.show = force_ro_show;
2066         md->force_ro.store = force_ro_store;
2067         sysfs_attr_init(&md->force_ro.attr);
2068         md->force_ro.attr.name = "force_ro";
2069         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2070         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2071         if (ret)
2072                 goto force_ro_fail;
2073
2074         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2075              card->ext_csd.boot_ro_lockable) {
2076                 umode_t mode;
2077
2078                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2079                         mode = S_IRUGO;
2080                 else
2081                         mode = S_IRUGO | S_IWUSR;
2082
2083                 md->power_ro_lock.show = power_ro_lock_show;
2084                 md->power_ro_lock.store = power_ro_lock_store;
2085                 sysfs_attr_init(&md->power_ro_lock.attr);
2086                 md->power_ro_lock.attr.mode = mode;
2087                 md->power_ro_lock.attr.name =
2088                                         "ro_lock_until_next_power_on";
2089                 ret = device_create_file(disk_to_dev(md->disk),
2090                                 &md->power_ro_lock);
2091                 if (ret)
2092                         goto power_ro_lock_fail;
2093         }
2094         return ret;
2095
2096 power_ro_lock_fail:
2097         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2098 force_ro_fail:
2099         del_gendisk(md->disk);
2100
2101         return ret;
2102 }
2103
2104 static int mmc_blk_probe(struct mmc_card *card)
2105 {
2106         struct mmc_blk_data *md, *part_md;
2107         char cap_str[10];
2108
2109         /*
2110          * Check that the card supports the command class(es) we need.
2111          */
2112         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2113                 return -ENODEV;
2114
2115         mmc_fixup_device(card, mmc_blk_fixups);
2116
2117         md = mmc_blk_alloc(card);
2118         if (IS_ERR(md))
2119                 return PTR_ERR(md);
2120
2121         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2122                         cap_str, sizeof(cap_str));
2123         pr_info("%s: %s %s %s %s\n",
2124                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2125                 cap_str, md->read_only ? "(ro)" : "");
2126
2127         if (mmc_blk_alloc_parts(card, md))
2128                 goto out;
2129
2130         dev_set_drvdata(&card->dev, md);
2131
2132         if (mmc_add_disk(md))
2133                 goto out;
2134
2135         list_for_each_entry(part_md, &md->part, part) {
2136                 if (mmc_add_disk(part_md))
2137                         goto out;
2138         }
2139
2140         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2141         pm_runtime_use_autosuspend(&card->dev);
2142
2143         /*
2144          * Don't enable runtime PM for SD-combo cards here. Leave that
2145          * decision to be taken during the SDIO init sequence instead.
2146          */
2147         if (card->type != MMC_TYPE_SD_COMBO) {
2148                 pm_runtime_set_active(&card->dev);
2149                 pm_runtime_enable(&card->dev);
2150         }
2151
2152         return 0;
2153
2154  out:
2155         mmc_blk_remove_parts(card, md);
2156         mmc_blk_remove_req(md);
2157         return 0;
2158 }
2159
2160 static void mmc_blk_remove(struct mmc_card *card)
2161 {
2162         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2163
2164         mmc_blk_remove_parts(card, md);
2165         pm_runtime_get_sync(&card->dev);
2166         mmc_claim_host(card->host);
2167         mmc_blk_part_switch(card, md);
2168         mmc_release_host(card->host);
2169         if (card->type != MMC_TYPE_SD_COMBO)
2170                 pm_runtime_disable(&card->dev);
2171         pm_runtime_put_noidle(&card->dev);
2172         mmc_blk_remove_req(md);
2173         dev_set_drvdata(&card->dev, NULL);
2174 }
2175
2176 static int _mmc_blk_suspend(struct mmc_card *card)
2177 {
2178         struct mmc_blk_data *part_md;
2179         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2180
2181         if (md) {
2182                 mmc_queue_suspend(&md->queue);
2183                 list_for_each_entry(part_md, &md->part, part) {
2184                         mmc_queue_suspend(&part_md->queue);
2185                 }
2186         }
2187         return 0;
2188 }
2189
2190 static void mmc_blk_shutdown(struct mmc_card *card)
2191 {
2192         _mmc_blk_suspend(card);
2193 }
2194
2195 #ifdef CONFIG_PM_SLEEP
2196 static int mmc_blk_suspend(struct device *dev)
2197 {
2198         struct mmc_card *card = mmc_dev_to_card(dev);
2199
2200         return _mmc_blk_suspend(card);
2201 }
2202
2203 static int mmc_blk_resume(struct device *dev)
2204 {
2205         struct mmc_blk_data *part_md;
2206         struct mmc_blk_data *md = dev_get_drvdata(dev);
2207
2208         if (md) {
2209                 /*
2210                  * Resume involves the card going into idle state,
2211                  * so current partition is always the main one.
2212                  */
2213                 md->part_curr = md->part_type;
2214                 mmc_queue_resume(&md->queue);
2215                 list_for_each_entry(part_md, &md->part, part) {
2216                         mmc_queue_resume(&part_md->queue);
2217                 }
2218         }
2219         return 0;
2220 }
2221 #endif
2222
2223 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2224
2225 static struct mmc_driver mmc_driver = {
2226         .drv            = {
2227                 .name   = "mmcblk",
2228                 .pm     = &mmc_blk_pm_ops,
2229         },
2230         .probe          = mmc_blk_probe,
2231         .remove         = mmc_blk_remove,
2232         .shutdown       = mmc_blk_shutdown,
2233 };
2234
2235 static int __init mmc_blk_init(void)
2236 {
2237         int res;
2238
2239         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2240                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2241
2242         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2243
2244         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2245         if (res)
2246                 goto out;
2247
2248         res = mmc_register_driver(&mmc_driver);
2249         if (res)
2250                 goto out2;
2251
2252         return 0;
2253  out2:
2254         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2255  out:
2256         return res;
2257 }
2258
2259 static void __exit mmc_blk_exit(void)
2260 {
2261         mmc_unregister_driver(&mmc_driver);
2262         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2263 }
2264
2265 module_init(mmc_blk_init);
2266 module_exit(mmc_blk_exit);
2267
2268 MODULE_LICENSE("GPL");
2269 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2270