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