1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Block driver for media (i.e., flash cards) 4 * 5 * Copyright 2002 Hewlett-Packard Company 6 * Copyright 2005-2008 Pierre Ossman 7 * 8 * Use consistent with the GNU GPL is permitted, 9 * provided that this copyright notice is 10 * preserved in its entirety in all copies and derived works. 11 * 12 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED, 13 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS 14 * FITNESS FOR ANY PARTICULAR PURPOSE. 15 * 16 * Many thanks to Alessandro Rubini and Jonathan Corbet! 17 * 18 * Author: Andrew Christian 19 * 28 May 2002 20 */ 21 #include <linux/moduleparam.h> 22 #include <linux/module.h> 23 #include <linux/init.h> 24 25 #include <linux/kernel.h> 26 #include <linux/fs.h> 27 #include <linux/slab.h> 28 #include <linux/errno.h> 29 #include <linux/hdreg.h> 30 #include <linux/kdev_t.h> 31 #include <linux/kref.h> 32 #include <linux/blkdev.h> 33 #include <linux/cdev.h> 34 #include <linux/mutex.h> 35 #include <linux/scatterlist.h> 36 #include <linux/string_helpers.h> 37 #include <linux/delay.h> 38 #include <linux/capability.h> 39 #include <linux/compat.h> 40 #include <linux/pm_runtime.h> 41 #include <linux/idr.h> 42 #include <linux/debugfs.h> 43 44 #include <linux/mmc/ioctl.h> 45 #include <linux/mmc/card.h> 46 #include <linux/mmc/host.h> 47 #include <linux/mmc/mmc.h> 48 #include <linux/mmc/sd.h> 49 50 #include <linux/uaccess.h> 51 52 #include "queue.h" 53 #include "block.h" 54 #include "core.h" 55 #include "card.h" 56 #include "crypto.h" 57 #include "host.h" 58 #include "bus.h" 59 #include "mmc_ops.h" 60 #include "quirks.h" 61 #include "sd_ops.h" 62 63 MODULE_ALIAS("mmc:block"); 64 #ifdef MODULE_PARAM_PREFIX 65 #undef MODULE_PARAM_PREFIX 66 #endif 67 #define MODULE_PARAM_PREFIX "mmcblk." 68 69 /* 70 * Set a 10 second timeout for polling write request busy state. Note, mmc core 71 * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10 72 * second software timer to timeout the whole request, so 10 seconds should be 73 * ample. 74 */ 75 #define MMC_BLK_TIMEOUT_MS (10 * 1000) 76 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16) 77 #define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8) 78 79 #define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \ 80 (rq_data_dir(req) == WRITE)) 81 static DEFINE_MUTEX(block_mutex); 82 83 /* 84 * The defaults come from config options but can be overriden by module 85 * or bootarg options. 86 */ 87 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; 88 89 /* 90 * We've only got one major, so number of mmcblk devices is 91 * limited to (1 << 20) / number of minors per device. It is also 92 * limited by the MAX_DEVICES below. 93 */ 94 static int max_devices; 95 96 #define MAX_DEVICES 256 97 98 static DEFINE_IDA(mmc_blk_ida); 99 static DEFINE_IDA(mmc_rpmb_ida); 100 101 /* 102 * There is one mmc_blk_data per slot. 103 */ 104 struct mmc_blk_data { 105 struct device *parent; 106 struct gendisk *disk; 107 struct mmc_queue queue; 108 struct list_head part; 109 struct list_head rpmbs; 110 111 unsigned int flags; 112 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */ 113 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */ 114 115 struct kref kref; 116 unsigned int read_only; 117 unsigned int part_type; 118 unsigned int reset_done; 119 #define MMC_BLK_READ BIT(0) 120 #define MMC_BLK_WRITE BIT(1) 121 #define MMC_BLK_DISCARD BIT(2) 122 #define MMC_BLK_SECDISCARD BIT(3) 123 #define MMC_BLK_CQE_RECOVERY BIT(4) 124 125 /* 126 * Only set in main mmc_blk_data associated 127 * with mmc_card with dev_set_drvdata, and keeps 128 * track of the current selected device partition. 129 */ 130 unsigned int part_curr; 131 struct device_attribute force_ro; 132 struct device_attribute power_ro_lock; 133 int area_type; 134 135 /* debugfs files (only in main mmc_blk_data) */ 136 struct dentry *status_dentry; 137 struct dentry *ext_csd_dentry; 138 }; 139 140 /* Device type for RPMB character devices */ 141 static dev_t mmc_rpmb_devt; 142 143 /* Bus type for RPMB character devices */ 144 static struct bus_type mmc_rpmb_bus_type = { 145 .name = "mmc_rpmb", 146 }; 147 148 /** 149 * struct mmc_rpmb_data - special RPMB device type for these areas 150 * @dev: the device for the RPMB area 151 * @chrdev: character device for the RPMB area 152 * @id: unique device ID number 153 * @part_index: partition index (0 on first) 154 * @md: parent MMC block device 155 * @node: list item, so we can put this device on a list 156 */ 157 struct mmc_rpmb_data { 158 struct device dev; 159 struct cdev chrdev; 160 int id; 161 unsigned int part_index; 162 struct mmc_blk_data *md; 163 struct list_head node; 164 }; 165 166 static DEFINE_MUTEX(open_lock); 167 168 module_param(perdev_minors, int, 0444); 169 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); 170 171 static inline int mmc_blk_part_switch(struct mmc_card *card, 172 unsigned int part_type); 173 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, 174 struct mmc_card *card, 175 int disable_multi, 176 struct mmc_queue *mq); 177 static void mmc_blk_hsq_req_done(struct mmc_request *mrq); 178 179 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) 180 { 181 struct mmc_blk_data *md; 182 183 mutex_lock(&open_lock); 184 md = disk->private_data; 185 if (md && !kref_get_unless_zero(&md->kref)) 186 md = NULL; 187 mutex_unlock(&open_lock); 188 189 return md; 190 } 191 192 static inline int mmc_get_devidx(struct gendisk *disk) 193 { 194 int devidx = disk->first_minor / perdev_minors; 195 return devidx; 196 } 197 198 static void mmc_blk_kref_release(struct kref *ref) 199 { 200 struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref); 201 int devidx; 202 203 devidx = mmc_get_devidx(md->disk); 204 ida_simple_remove(&mmc_blk_ida, devidx); 205 206 mutex_lock(&open_lock); 207 md->disk->private_data = NULL; 208 mutex_unlock(&open_lock); 209 210 put_disk(md->disk); 211 kfree(md); 212 } 213 214 static void mmc_blk_put(struct mmc_blk_data *md) 215 { 216 kref_put(&md->kref, mmc_blk_kref_release); 217 } 218 219 static ssize_t power_ro_lock_show(struct device *dev, 220 struct device_attribute *attr, char *buf) 221 { 222 int ret; 223 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); 224 struct mmc_card *card = md->queue.card; 225 int locked = 0; 226 227 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN) 228 locked = 2; 229 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN) 230 locked = 1; 231 232 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked); 233 234 mmc_blk_put(md); 235 236 return ret; 237 } 238 239 static ssize_t power_ro_lock_store(struct device *dev, 240 struct device_attribute *attr, const char *buf, size_t count) 241 { 242 int ret; 243 struct mmc_blk_data *md, *part_md; 244 struct mmc_queue *mq; 245 struct request *req; 246 unsigned long set; 247 248 if (kstrtoul(buf, 0, &set)) 249 return -EINVAL; 250 251 if (set != 1) 252 return count; 253 254 md = mmc_blk_get(dev_to_disk(dev)); 255 mq = &md->queue; 256 257 /* Dispatch locking to the block layer */ 258 req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, 0); 259 if (IS_ERR(req)) { 260 count = PTR_ERR(req); 261 goto out_put; 262 } 263 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP; 264 blk_execute_rq(NULL, req, 0); 265 ret = req_to_mmc_queue_req(req)->drv_op_result; 266 blk_put_request(req); 267 268 if (!ret) { 269 pr_info("%s: Locking boot partition ro until next power on\n", 270 md->disk->disk_name); 271 set_disk_ro(md->disk, 1); 272 273 list_for_each_entry(part_md, &md->part, part) 274 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) { 275 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name); 276 set_disk_ro(part_md->disk, 1); 277 } 278 } 279 out_put: 280 mmc_blk_put(md); 281 return count; 282 } 283 284 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr, 285 char *buf) 286 { 287 int ret; 288 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); 289 290 ret = snprintf(buf, PAGE_SIZE, "%d\n", 291 get_disk_ro(dev_to_disk(dev)) ^ 292 md->read_only); 293 mmc_blk_put(md); 294 return ret; 295 } 296 297 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr, 298 const char *buf, size_t count) 299 { 300 int ret; 301 char *end; 302 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); 303 unsigned long set = simple_strtoul(buf, &end, 0); 304 if (end == buf) { 305 ret = -EINVAL; 306 goto out; 307 } 308 309 set_disk_ro(dev_to_disk(dev), set || md->read_only); 310 ret = count; 311 out: 312 mmc_blk_put(md); 313 return ret; 314 } 315 316 static int mmc_blk_open(struct block_device *bdev, fmode_t mode) 317 { 318 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); 319 int ret = -ENXIO; 320 321 mutex_lock(&block_mutex); 322 if (md) { 323 ret = 0; 324 if ((mode & FMODE_WRITE) && md->read_only) { 325 mmc_blk_put(md); 326 ret = -EROFS; 327 } 328 } 329 mutex_unlock(&block_mutex); 330 331 return ret; 332 } 333 334 static void mmc_blk_release(struct gendisk *disk, fmode_t mode) 335 { 336 struct mmc_blk_data *md = disk->private_data; 337 338 mutex_lock(&block_mutex); 339 mmc_blk_put(md); 340 mutex_unlock(&block_mutex); 341 } 342 343 static int 344 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 345 { 346 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); 347 geo->heads = 4; 348 geo->sectors = 16; 349 return 0; 350 } 351 352 struct mmc_blk_ioc_data { 353 struct mmc_ioc_cmd ic; 354 unsigned char *buf; 355 u64 buf_bytes; 356 struct mmc_rpmb_data *rpmb; 357 }; 358 359 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user( 360 struct mmc_ioc_cmd __user *user) 361 { 362 struct mmc_blk_ioc_data *idata; 363 int err; 364 365 idata = kmalloc(sizeof(*idata), GFP_KERNEL); 366 if (!idata) { 367 err = -ENOMEM; 368 goto out; 369 } 370 371 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) { 372 err = -EFAULT; 373 goto idata_err; 374 } 375 376 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks; 377 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) { 378 err = -EOVERFLOW; 379 goto idata_err; 380 } 381 382 if (!idata->buf_bytes) { 383 idata->buf = NULL; 384 return idata; 385 } 386 387 idata->buf = memdup_user((void __user *)(unsigned long) 388 idata->ic.data_ptr, idata->buf_bytes); 389 if (IS_ERR(idata->buf)) { 390 err = PTR_ERR(idata->buf); 391 goto idata_err; 392 } 393 394 return idata; 395 396 idata_err: 397 kfree(idata); 398 out: 399 return ERR_PTR(err); 400 } 401 402 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr, 403 struct mmc_blk_ioc_data *idata) 404 { 405 struct mmc_ioc_cmd *ic = &idata->ic; 406 407 if (copy_to_user(&(ic_ptr->response), ic->response, 408 sizeof(ic->response))) 409 return -EFAULT; 410 411 if (!idata->ic.write_flag) { 412 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr, 413 idata->buf, idata->buf_bytes)) 414 return -EFAULT; 415 } 416 417 return 0; 418 } 419 420 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms, 421 u32 *resp_errs) 422 { 423 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms); 424 int err = 0; 425 u32 status; 426 427 do { 428 bool done = time_after(jiffies, timeout); 429 430 err = __mmc_send_status(card, &status, 5); 431 if (err) { 432 dev_err(mmc_dev(card->host), 433 "error %d requesting status\n", err); 434 return err; 435 } 436 437 /* Accumulate any response error bits seen */ 438 if (resp_errs) 439 *resp_errs |= status; 440 441 /* 442 * Timeout if the device never becomes ready for data and never 443 * leaves the program state. 444 */ 445 if (done) { 446 dev_err(mmc_dev(card->host), 447 "Card stuck in wrong state! %s status: %#x\n", 448 __func__, status); 449 return -ETIMEDOUT; 450 } 451 } while (!mmc_ready_for_data(status)); 452 453 return err; 454 } 455 456 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md, 457 struct mmc_blk_ioc_data *idata) 458 { 459 struct mmc_command cmd = {}, sbc = {}; 460 struct mmc_data data = {}; 461 struct mmc_request mrq = {}; 462 struct scatterlist sg; 463 int err; 464 unsigned int target_part; 465 466 if (!card || !md || !idata) 467 return -EINVAL; 468 469 /* 470 * The RPMB accesses comes in from the character device, so we 471 * need to target these explicitly. Else we just target the 472 * partition type for the block device the ioctl() was issued 473 * on. 474 */ 475 if (idata->rpmb) { 476 /* Support multiple RPMB partitions */ 477 target_part = idata->rpmb->part_index; 478 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB; 479 } else { 480 target_part = md->part_type; 481 } 482 483 cmd.opcode = idata->ic.opcode; 484 cmd.arg = idata->ic.arg; 485 cmd.flags = idata->ic.flags; 486 487 if (idata->buf_bytes) { 488 data.sg = &sg; 489 data.sg_len = 1; 490 data.blksz = idata->ic.blksz; 491 data.blocks = idata->ic.blocks; 492 493 sg_init_one(data.sg, idata->buf, idata->buf_bytes); 494 495 if (idata->ic.write_flag) 496 data.flags = MMC_DATA_WRITE; 497 else 498 data.flags = MMC_DATA_READ; 499 500 /* data.flags must already be set before doing this. */ 501 mmc_set_data_timeout(&data, card); 502 503 /* Allow overriding the timeout_ns for empirical tuning. */ 504 if (idata->ic.data_timeout_ns) 505 data.timeout_ns = idata->ic.data_timeout_ns; 506 507 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) { 508 /* 509 * Pretend this is a data transfer and rely on the 510 * host driver to compute timeout. When all host 511 * drivers support cmd.cmd_timeout for R1B, this 512 * can be changed to: 513 * 514 * mrq.data = NULL; 515 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms; 516 */ 517 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000; 518 } 519 520 mrq.data = &data; 521 } 522 523 mrq.cmd = &cmd; 524 525 err = mmc_blk_part_switch(card, target_part); 526 if (err) 527 return err; 528 529 if (idata->ic.is_acmd) { 530 err = mmc_app_cmd(card->host, card); 531 if (err) 532 return err; 533 } 534 535 if (idata->rpmb) { 536 sbc.opcode = MMC_SET_BLOCK_COUNT; 537 /* 538 * We don't do any blockcount validation because the max size 539 * may be increased by a future standard. We just copy the 540 * 'Reliable Write' bit here. 541 */ 542 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31)); 543 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC; 544 mrq.sbc = &sbc; 545 } 546 547 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) && 548 (cmd.opcode == MMC_SWITCH)) 549 return mmc_sanitize(card, idata->ic.cmd_timeout_ms); 550 551 mmc_wait_for_req(card->host, &mrq); 552 553 if (cmd.error) { 554 dev_err(mmc_dev(card->host), "%s: cmd error %d\n", 555 __func__, cmd.error); 556 return cmd.error; 557 } 558 if (data.error) { 559 dev_err(mmc_dev(card->host), "%s: data error %d\n", 560 __func__, data.error); 561 return data.error; 562 } 563 564 /* 565 * Make sure the cache of the PARTITION_CONFIG register and 566 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write 567 * changed it successfully. 568 */ 569 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) && 570 (cmd.opcode == MMC_SWITCH)) { 571 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev); 572 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg); 573 574 /* 575 * Update cache so the next mmc_blk_part_switch call operates 576 * on up-to-date data. 577 */ 578 card->ext_csd.part_config = value; 579 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK; 580 } 581 582 /* 583 * Make sure to update CACHE_CTRL in case it was changed. The cache 584 * will get turned back on if the card is re-initialized, e.g. 585 * suspend/resume or hw reset in recovery. 586 */ 587 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) && 588 (cmd.opcode == MMC_SWITCH)) { 589 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1; 590 591 card->ext_csd.cache_ctrl = value; 592 } 593 594 /* 595 * According to the SD specs, some commands require a delay after 596 * issuing the command. 597 */ 598 if (idata->ic.postsleep_min_us) 599 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us); 600 601 memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp)); 602 603 if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) { 604 /* 605 * Ensure RPMB/R1B command has completed by polling CMD13 606 * "Send Status". 607 */ 608 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL); 609 } 610 611 return err; 612 } 613 614 static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md, 615 struct mmc_ioc_cmd __user *ic_ptr, 616 struct mmc_rpmb_data *rpmb) 617 { 618 struct mmc_blk_ioc_data *idata; 619 struct mmc_blk_ioc_data *idatas[1]; 620 struct mmc_queue *mq; 621 struct mmc_card *card; 622 int err = 0, ioc_err = 0; 623 struct request *req; 624 625 idata = mmc_blk_ioctl_copy_from_user(ic_ptr); 626 if (IS_ERR(idata)) 627 return PTR_ERR(idata); 628 /* This will be NULL on non-RPMB ioctl():s */ 629 idata->rpmb = rpmb; 630 631 card = md->queue.card; 632 if (IS_ERR(card)) { 633 err = PTR_ERR(card); 634 goto cmd_done; 635 } 636 637 /* 638 * Dispatch the ioctl() into the block request queue. 639 */ 640 mq = &md->queue; 641 req = blk_get_request(mq->queue, 642 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 643 if (IS_ERR(req)) { 644 err = PTR_ERR(req); 645 goto cmd_done; 646 } 647 idatas[0] = idata; 648 req_to_mmc_queue_req(req)->drv_op = 649 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL; 650 req_to_mmc_queue_req(req)->drv_op_data = idatas; 651 req_to_mmc_queue_req(req)->ioc_count = 1; 652 blk_execute_rq(NULL, req, 0); 653 ioc_err = req_to_mmc_queue_req(req)->drv_op_result; 654 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata); 655 blk_put_request(req); 656 657 cmd_done: 658 kfree(idata->buf); 659 kfree(idata); 660 return ioc_err ? ioc_err : err; 661 } 662 663 static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md, 664 struct mmc_ioc_multi_cmd __user *user, 665 struct mmc_rpmb_data *rpmb) 666 { 667 struct mmc_blk_ioc_data **idata = NULL; 668 struct mmc_ioc_cmd __user *cmds = user->cmds; 669 struct mmc_card *card; 670 struct mmc_queue *mq; 671 int i, err = 0, ioc_err = 0; 672 __u64 num_of_cmds; 673 struct request *req; 674 675 if (copy_from_user(&num_of_cmds, &user->num_of_cmds, 676 sizeof(num_of_cmds))) 677 return -EFAULT; 678 679 if (!num_of_cmds) 680 return 0; 681 682 if (num_of_cmds > MMC_IOC_MAX_CMDS) 683 return -EINVAL; 684 685 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL); 686 if (!idata) 687 return -ENOMEM; 688 689 for (i = 0; i < num_of_cmds; i++) { 690 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]); 691 if (IS_ERR(idata[i])) { 692 err = PTR_ERR(idata[i]); 693 num_of_cmds = i; 694 goto cmd_err; 695 } 696 /* This will be NULL on non-RPMB ioctl():s */ 697 idata[i]->rpmb = rpmb; 698 } 699 700 card = md->queue.card; 701 if (IS_ERR(card)) { 702 err = PTR_ERR(card); 703 goto cmd_err; 704 } 705 706 707 /* 708 * Dispatch the ioctl()s into the block request queue. 709 */ 710 mq = &md->queue; 711 req = blk_get_request(mq->queue, 712 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); 713 if (IS_ERR(req)) { 714 err = PTR_ERR(req); 715 goto cmd_err; 716 } 717 req_to_mmc_queue_req(req)->drv_op = 718 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL; 719 req_to_mmc_queue_req(req)->drv_op_data = idata; 720 req_to_mmc_queue_req(req)->ioc_count = num_of_cmds; 721 blk_execute_rq(NULL, req, 0); 722 ioc_err = req_to_mmc_queue_req(req)->drv_op_result; 723 724 /* copy to user if data and response */ 725 for (i = 0; i < num_of_cmds && !err; i++) 726 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]); 727 728 blk_put_request(req); 729 730 cmd_err: 731 for (i = 0; i < num_of_cmds; i++) { 732 kfree(idata[i]->buf); 733 kfree(idata[i]); 734 } 735 kfree(idata); 736 return ioc_err ? ioc_err : err; 737 } 738 739 static int mmc_blk_check_blkdev(struct block_device *bdev) 740 { 741 /* 742 * The caller must have CAP_SYS_RAWIO, and must be calling this on the 743 * whole block device, not on a partition. This prevents overspray 744 * between sibling partitions. 745 */ 746 if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev)) 747 return -EPERM; 748 return 0; 749 } 750 751 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode, 752 unsigned int cmd, unsigned long arg) 753 { 754 struct mmc_blk_data *md; 755 int ret; 756 757 switch (cmd) { 758 case MMC_IOC_CMD: 759 ret = mmc_blk_check_blkdev(bdev); 760 if (ret) 761 return ret; 762 md = mmc_blk_get(bdev->bd_disk); 763 if (!md) 764 return -EINVAL; 765 ret = mmc_blk_ioctl_cmd(md, 766 (struct mmc_ioc_cmd __user *)arg, 767 NULL); 768 mmc_blk_put(md); 769 return ret; 770 case MMC_IOC_MULTI_CMD: 771 ret = mmc_blk_check_blkdev(bdev); 772 if (ret) 773 return ret; 774 md = mmc_blk_get(bdev->bd_disk); 775 if (!md) 776 return -EINVAL; 777 ret = mmc_blk_ioctl_multi_cmd(md, 778 (struct mmc_ioc_multi_cmd __user *)arg, 779 NULL); 780 mmc_blk_put(md); 781 return ret; 782 default: 783 return -EINVAL; 784 } 785 } 786 787 #ifdef CONFIG_COMPAT 788 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode, 789 unsigned int cmd, unsigned long arg) 790 { 791 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg)); 792 } 793 #endif 794 795 static const struct block_device_operations mmc_bdops = { 796 .open = mmc_blk_open, 797 .release = mmc_blk_release, 798 .getgeo = mmc_blk_getgeo, 799 .owner = THIS_MODULE, 800 .ioctl = mmc_blk_ioctl, 801 #ifdef CONFIG_COMPAT 802 .compat_ioctl = mmc_blk_compat_ioctl, 803 #endif 804 }; 805 806 static int mmc_blk_part_switch_pre(struct mmc_card *card, 807 unsigned int part_type) 808 { 809 int ret = 0; 810 811 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) { 812 if (card->ext_csd.cmdq_en) { 813 ret = mmc_cmdq_disable(card); 814 if (ret) 815 return ret; 816 } 817 mmc_retune_pause(card->host); 818 } 819 820 return ret; 821 } 822 823 static int mmc_blk_part_switch_post(struct mmc_card *card, 824 unsigned int part_type) 825 { 826 int ret = 0; 827 828 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) { 829 mmc_retune_unpause(card->host); 830 if (card->reenable_cmdq && !card->ext_csd.cmdq_en) 831 ret = mmc_cmdq_enable(card); 832 } 833 834 return ret; 835 } 836 837 static inline int mmc_blk_part_switch(struct mmc_card *card, 838 unsigned int part_type) 839 { 840 int ret = 0; 841 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev); 842 843 if (main_md->part_curr == part_type) 844 return 0; 845 846 if (mmc_card_mmc(card)) { 847 u8 part_config = card->ext_csd.part_config; 848 849 ret = mmc_blk_part_switch_pre(card, part_type); 850 if (ret) 851 return ret; 852 853 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 854 part_config |= part_type; 855 856 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 857 EXT_CSD_PART_CONFIG, part_config, 858 card->ext_csd.part_time); 859 if (ret) { 860 mmc_blk_part_switch_post(card, part_type); 861 return ret; 862 } 863 864 card->ext_csd.part_config = part_config; 865 866 ret = mmc_blk_part_switch_post(card, main_md->part_curr); 867 } 868 869 main_md->part_curr = part_type; 870 return ret; 871 } 872 873 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) 874 { 875 int err; 876 u32 result; 877 __be32 *blocks; 878 879 struct mmc_request mrq = {}; 880 struct mmc_command cmd = {}; 881 struct mmc_data data = {}; 882 883 struct scatterlist sg; 884 885 cmd.opcode = MMC_APP_CMD; 886 cmd.arg = card->rca << 16; 887 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 888 889 err = mmc_wait_for_cmd(card->host, &cmd, 0); 890 if (err) 891 return err; 892 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) 893 return -EIO; 894 895 memset(&cmd, 0, sizeof(struct mmc_command)); 896 897 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; 898 cmd.arg = 0; 899 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 900 901 data.blksz = 4; 902 data.blocks = 1; 903 data.flags = MMC_DATA_READ; 904 data.sg = &sg; 905 data.sg_len = 1; 906 mmc_set_data_timeout(&data, card); 907 908 mrq.cmd = &cmd; 909 mrq.data = &data; 910 911 blocks = kmalloc(4, GFP_KERNEL); 912 if (!blocks) 913 return -ENOMEM; 914 915 sg_init_one(&sg, blocks, 4); 916 917 mmc_wait_for_req(card->host, &mrq); 918 919 result = ntohl(*blocks); 920 kfree(blocks); 921 922 if (cmd.error || data.error) 923 return -EIO; 924 925 *written_blocks = result; 926 927 return 0; 928 } 929 930 static unsigned int mmc_blk_clock_khz(struct mmc_host *host) 931 { 932 if (host->actual_clock) 933 return host->actual_clock / 1000; 934 935 /* Clock may be subject to a divisor, fudge it by a factor of 2. */ 936 if (host->ios.clock) 937 return host->ios.clock / 2000; 938 939 /* How can there be no clock */ 940 WARN_ON_ONCE(1); 941 return 100; /* 100 kHz is minimum possible value */ 942 } 943 944 static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host, 945 struct mmc_data *data) 946 { 947 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000); 948 unsigned int khz; 949 950 if (data->timeout_clks) { 951 khz = mmc_blk_clock_khz(host); 952 ms += DIV_ROUND_UP(data->timeout_clks, khz); 953 } 954 955 return ms; 956 } 957 958 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host, 959 int type) 960 { 961 int err; 962 963 if (md->reset_done & type) 964 return -EEXIST; 965 966 md->reset_done |= type; 967 err = mmc_hw_reset(host); 968 /* Ensure we switch back to the correct partition */ 969 if (err) { 970 struct mmc_blk_data *main_md = 971 dev_get_drvdata(&host->card->dev); 972 int part_err; 973 974 main_md->part_curr = main_md->part_type; 975 part_err = mmc_blk_part_switch(host->card, md->part_type); 976 if (part_err) { 977 /* 978 * We have failed to get back into the correct 979 * partition, so we need to abort the whole request. 980 */ 981 return -ENODEV; 982 } 983 } 984 return err; 985 } 986 987 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type) 988 { 989 md->reset_done &= ~type; 990 } 991 992 /* 993 * The non-block commands come back from the block layer after it queued it and 994 * processed it with all other requests and then they get issued in this 995 * function. 996 */ 997 static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req) 998 { 999 struct mmc_queue_req *mq_rq; 1000 struct mmc_card *card = mq->card; 1001 struct mmc_blk_data *md = mq->blkdata; 1002 struct mmc_blk_ioc_data **idata; 1003 bool rpmb_ioctl; 1004 u8 **ext_csd; 1005 u32 status; 1006 int ret; 1007 int i; 1008 1009 mq_rq = req_to_mmc_queue_req(req); 1010 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB); 1011 1012 switch (mq_rq->drv_op) { 1013 case MMC_DRV_OP_IOCTL: 1014 if (card->ext_csd.cmdq_en) { 1015 ret = mmc_cmdq_disable(card); 1016 if (ret) 1017 break; 1018 } 1019 fallthrough; 1020 case MMC_DRV_OP_IOCTL_RPMB: 1021 idata = mq_rq->drv_op_data; 1022 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) { 1023 ret = __mmc_blk_ioctl_cmd(card, md, idata[i]); 1024 if (ret) 1025 break; 1026 } 1027 /* Always switch back to main area after RPMB access */ 1028 if (rpmb_ioctl) 1029 mmc_blk_part_switch(card, 0); 1030 else if (card->reenable_cmdq && !card->ext_csd.cmdq_en) 1031 mmc_cmdq_enable(card); 1032 break; 1033 case MMC_DRV_OP_BOOT_WP: 1034 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP, 1035 card->ext_csd.boot_ro_lock | 1036 EXT_CSD_BOOT_WP_B_PWR_WP_EN, 1037 card->ext_csd.part_time); 1038 if (ret) 1039 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", 1040 md->disk->disk_name, ret); 1041 else 1042 card->ext_csd.boot_ro_lock |= 1043 EXT_CSD_BOOT_WP_B_PWR_WP_EN; 1044 break; 1045 case MMC_DRV_OP_GET_CARD_STATUS: 1046 ret = mmc_send_status(card, &status); 1047 if (!ret) 1048 ret = status; 1049 break; 1050 case MMC_DRV_OP_GET_EXT_CSD: 1051 ext_csd = mq_rq->drv_op_data; 1052 ret = mmc_get_ext_csd(card, ext_csd); 1053 break; 1054 default: 1055 pr_err("%s: unknown driver specific operation\n", 1056 md->disk->disk_name); 1057 ret = -EINVAL; 1058 break; 1059 } 1060 mq_rq->drv_op_result = ret; 1061 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK); 1062 } 1063 1064 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req) 1065 { 1066 struct mmc_blk_data *md = mq->blkdata; 1067 struct mmc_card *card = md->queue.card; 1068 unsigned int from, nr; 1069 int err = 0, type = MMC_BLK_DISCARD; 1070 blk_status_t status = BLK_STS_OK; 1071 1072 if (!mmc_can_erase(card)) { 1073 status = BLK_STS_NOTSUPP; 1074 goto fail; 1075 } 1076 1077 from = blk_rq_pos(req); 1078 nr = blk_rq_sectors(req); 1079 1080 do { 1081 err = 0; 1082 if (card->quirks & MMC_QUIRK_INAND_CMD38) { 1083 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1084 INAND_CMD38_ARG_EXT_CSD, 1085 card->erase_arg == MMC_TRIM_ARG ? 1086 INAND_CMD38_ARG_TRIM : 1087 INAND_CMD38_ARG_ERASE, 1088 card->ext_csd.generic_cmd6_time); 1089 } 1090 if (!err) 1091 err = mmc_erase(card, from, nr, card->erase_arg); 1092 } while (err == -EIO && !mmc_blk_reset(md, card->host, type)); 1093 if (err) 1094 status = BLK_STS_IOERR; 1095 else 1096 mmc_blk_reset_success(md, type); 1097 fail: 1098 blk_mq_end_request(req, status); 1099 } 1100 1101 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, 1102 struct request *req) 1103 { 1104 struct mmc_blk_data *md = mq->blkdata; 1105 struct mmc_card *card = md->queue.card; 1106 unsigned int from, nr, arg; 1107 int err = 0, type = MMC_BLK_SECDISCARD; 1108 blk_status_t status = BLK_STS_OK; 1109 1110 if (!(mmc_can_secure_erase_trim(card))) { 1111 status = BLK_STS_NOTSUPP; 1112 goto out; 1113 } 1114 1115 from = blk_rq_pos(req); 1116 nr = blk_rq_sectors(req); 1117 1118 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) 1119 arg = MMC_SECURE_TRIM1_ARG; 1120 else 1121 arg = MMC_SECURE_ERASE_ARG; 1122 1123 retry: 1124 if (card->quirks & MMC_QUIRK_INAND_CMD38) { 1125 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1126 INAND_CMD38_ARG_EXT_CSD, 1127 arg == MMC_SECURE_TRIM1_ARG ? 1128 INAND_CMD38_ARG_SECTRIM1 : 1129 INAND_CMD38_ARG_SECERASE, 1130 card->ext_csd.generic_cmd6_time); 1131 if (err) 1132 goto out_retry; 1133 } 1134 1135 err = mmc_erase(card, from, nr, arg); 1136 if (err == -EIO) 1137 goto out_retry; 1138 if (err) { 1139 status = BLK_STS_IOERR; 1140 goto out; 1141 } 1142 1143 if (arg == MMC_SECURE_TRIM1_ARG) { 1144 if (card->quirks & MMC_QUIRK_INAND_CMD38) { 1145 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 1146 INAND_CMD38_ARG_EXT_CSD, 1147 INAND_CMD38_ARG_SECTRIM2, 1148 card->ext_csd.generic_cmd6_time); 1149 if (err) 1150 goto out_retry; 1151 } 1152 1153 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); 1154 if (err == -EIO) 1155 goto out_retry; 1156 if (err) { 1157 status = BLK_STS_IOERR; 1158 goto out; 1159 } 1160 } 1161 1162 out_retry: 1163 if (err && !mmc_blk_reset(md, card->host, type)) 1164 goto retry; 1165 if (!err) 1166 mmc_blk_reset_success(md, type); 1167 out: 1168 blk_mq_end_request(req, status); 1169 } 1170 1171 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req) 1172 { 1173 struct mmc_blk_data *md = mq->blkdata; 1174 struct mmc_card *card = md->queue.card; 1175 int ret = 0; 1176 1177 ret = mmc_flush_cache(card->host); 1178 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK); 1179 } 1180 1181 /* 1182 * Reformat current write as a reliable write, supporting 1183 * both legacy and the enhanced reliable write MMC cards. 1184 * In each transfer we'll handle only as much as a single 1185 * reliable write can handle, thus finish the request in 1186 * partial completions. 1187 */ 1188 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq, 1189 struct mmc_card *card, 1190 struct request *req) 1191 { 1192 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) { 1193 /* Legacy mode imposes restrictions on transfers. */ 1194 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors)) 1195 brq->data.blocks = 1; 1196 1197 if (brq->data.blocks > card->ext_csd.rel_sectors) 1198 brq->data.blocks = card->ext_csd.rel_sectors; 1199 else if (brq->data.blocks < card->ext_csd.rel_sectors) 1200 brq->data.blocks = 1; 1201 } 1202 } 1203 1204 #define CMD_ERRORS_EXCL_OOR \ 1205 (R1_ADDRESS_ERROR | /* Misaligned address */ \ 1206 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\ 1207 R1_WP_VIOLATION | /* Tried to write to protected block */ \ 1208 R1_CARD_ECC_FAILED | /* Card ECC failed */ \ 1209 R1_CC_ERROR | /* Card controller error */ \ 1210 R1_ERROR) /* General/unknown error */ 1211 1212 #define CMD_ERRORS \ 1213 (CMD_ERRORS_EXCL_OOR | \ 1214 R1_OUT_OF_RANGE) /* Command argument out of range */ \ 1215 1216 static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq) 1217 { 1218 u32 val; 1219 1220 /* 1221 * Per the SD specification(physical layer version 4.10)[1], 1222 * section 4.3.3, it explicitly states that "When the last 1223 * block of user area is read using CMD18, the host should 1224 * ignore OUT_OF_RANGE error that may occur even the sequence 1225 * is correct". And JESD84-B51 for eMMC also has a similar 1226 * statement on section 6.8.3. 1227 * 1228 * Multiple block read/write could be done by either predefined 1229 * method, namely CMD23, or open-ending mode. For open-ending mode, 1230 * we should ignore the OUT_OF_RANGE error as it's normal behaviour. 1231 * 1232 * However the spec[1] doesn't tell us whether we should also 1233 * ignore that for predefined method. But per the spec[1], section 1234 * 4.15 Set Block Count Command, it says"If illegal block count 1235 * is set, out of range error will be indicated during read/write 1236 * operation (For example, data transfer is stopped at user area 1237 * boundary)." In another word, we could expect a out of range error 1238 * in the response for the following CMD18/25. And if argument of 1239 * CMD23 + the argument of CMD18/25 exceed the max number of blocks, 1240 * we could also expect to get a -ETIMEDOUT or any error number from 1241 * the host drivers due to missing data response(for write)/data(for 1242 * read), as the cards will stop the data transfer by itself per the 1243 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode. 1244 */ 1245 1246 if (!brq->stop.error) { 1247 bool oor_with_open_end; 1248 /* If there is no error yet, check R1 response */ 1249 1250 val = brq->stop.resp[0] & CMD_ERRORS; 1251 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc; 1252 1253 if (val && !oor_with_open_end) 1254 brq->stop.error = -EIO; 1255 } 1256 } 1257 1258 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq, 1259 int disable_multi, bool *do_rel_wr_p, 1260 bool *do_data_tag_p) 1261 { 1262 struct mmc_blk_data *md = mq->blkdata; 1263 struct mmc_card *card = md->queue.card; 1264 struct mmc_blk_request *brq = &mqrq->brq; 1265 struct request *req = mmc_queue_req_to_req(mqrq); 1266 bool do_rel_wr, do_data_tag; 1267 1268 /* 1269 * Reliable writes are used to implement Forced Unit Access and 1270 * are supported only on MMCs. 1271 */ 1272 do_rel_wr = (req->cmd_flags & REQ_FUA) && 1273 rq_data_dir(req) == WRITE && 1274 (md->flags & MMC_BLK_REL_WR); 1275 1276 memset(brq, 0, sizeof(struct mmc_blk_request)); 1277 1278 mmc_crypto_prepare_req(mqrq); 1279 1280 brq->mrq.data = &brq->data; 1281 brq->mrq.tag = req->tag; 1282 1283 brq->stop.opcode = MMC_STOP_TRANSMISSION; 1284 brq->stop.arg = 0; 1285 1286 if (rq_data_dir(req) == READ) { 1287 brq->data.flags = MMC_DATA_READ; 1288 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 1289 } else { 1290 brq->data.flags = MMC_DATA_WRITE; 1291 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; 1292 } 1293 1294 brq->data.blksz = 512; 1295 brq->data.blocks = blk_rq_sectors(req); 1296 brq->data.blk_addr = blk_rq_pos(req); 1297 1298 /* 1299 * The command queue supports 2 priorities: "high" (1) and "simple" (0). 1300 * The eMMC will give "high" priority tasks priority over "simple" 1301 * priority tasks. Here we always set "simple" priority by not setting 1302 * MMC_DATA_PRIO. 1303 */ 1304 1305 /* 1306 * The block layer doesn't support all sector count 1307 * restrictions, so we need to be prepared for too big 1308 * requests. 1309 */ 1310 if (brq->data.blocks > card->host->max_blk_count) 1311 brq->data.blocks = card->host->max_blk_count; 1312 1313 if (brq->data.blocks > 1) { 1314 /* 1315 * Some SD cards in SPI mode return a CRC error or even lock up 1316 * completely when trying to read the last block using a 1317 * multiblock read command. 1318 */ 1319 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) && 1320 (blk_rq_pos(req) + blk_rq_sectors(req) == 1321 get_capacity(md->disk))) 1322 brq->data.blocks--; 1323 1324 /* 1325 * After a read error, we redo the request one sector 1326 * at a time in order to accurately determine which 1327 * sectors can be read successfully. 1328 */ 1329 if (disable_multi) 1330 brq->data.blocks = 1; 1331 1332 /* 1333 * Some controllers have HW issues while operating 1334 * in multiple I/O mode 1335 */ 1336 if (card->host->ops->multi_io_quirk) 1337 brq->data.blocks = card->host->ops->multi_io_quirk(card, 1338 (rq_data_dir(req) == READ) ? 1339 MMC_DATA_READ : MMC_DATA_WRITE, 1340 brq->data.blocks); 1341 } 1342 1343 if (do_rel_wr) { 1344 mmc_apply_rel_rw(brq, card, req); 1345 brq->data.flags |= MMC_DATA_REL_WR; 1346 } 1347 1348 /* 1349 * Data tag is used only during writing meta data to speed 1350 * up write and any subsequent read of this meta data 1351 */ 1352 do_data_tag = card->ext_csd.data_tag_unit_size && 1353 (req->cmd_flags & REQ_META) && 1354 (rq_data_dir(req) == WRITE) && 1355 ((brq->data.blocks * brq->data.blksz) >= 1356 card->ext_csd.data_tag_unit_size); 1357 1358 if (do_data_tag) 1359 brq->data.flags |= MMC_DATA_DAT_TAG; 1360 1361 mmc_set_data_timeout(&brq->data, card); 1362 1363 brq->data.sg = mqrq->sg; 1364 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq); 1365 1366 /* 1367 * Adjust the sg list so it is the same size as the 1368 * request. 1369 */ 1370 if (brq->data.blocks != blk_rq_sectors(req)) { 1371 int i, data_size = brq->data.blocks << 9; 1372 struct scatterlist *sg; 1373 1374 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) { 1375 data_size -= sg->length; 1376 if (data_size <= 0) { 1377 sg->length += data_size; 1378 i++; 1379 break; 1380 } 1381 } 1382 brq->data.sg_len = i; 1383 } 1384 1385 if (do_rel_wr_p) 1386 *do_rel_wr_p = do_rel_wr; 1387 1388 if (do_data_tag_p) 1389 *do_data_tag_p = do_data_tag; 1390 } 1391 1392 #define MMC_CQE_RETRIES 2 1393 1394 static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req) 1395 { 1396 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1397 struct mmc_request *mrq = &mqrq->brq.mrq; 1398 struct request_queue *q = req->q; 1399 struct mmc_host *host = mq->card->host; 1400 enum mmc_issue_type issue_type = mmc_issue_type(mq, req); 1401 unsigned long flags; 1402 bool put_card; 1403 int err; 1404 1405 mmc_cqe_post_req(host, mrq); 1406 1407 if (mrq->cmd && mrq->cmd->error) 1408 err = mrq->cmd->error; 1409 else if (mrq->data && mrq->data->error) 1410 err = mrq->data->error; 1411 else 1412 err = 0; 1413 1414 if (err) { 1415 if (mqrq->retries++ < MMC_CQE_RETRIES) 1416 blk_mq_requeue_request(req, true); 1417 else 1418 blk_mq_end_request(req, BLK_STS_IOERR); 1419 } else if (mrq->data) { 1420 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered)) 1421 blk_mq_requeue_request(req, true); 1422 else 1423 __blk_mq_end_request(req, BLK_STS_OK); 1424 } else { 1425 blk_mq_end_request(req, BLK_STS_OK); 1426 } 1427 1428 spin_lock_irqsave(&mq->lock, flags); 1429 1430 mq->in_flight[issue_type] -= 1; 1431 1432 put_card = (mmc_tot_in_flight(mq) == 0); 1433 1434 mmc_cqe_check_busy(mq); 1435 1436 spin_unlock_irqrestore(&mq->lock, flags); 1437 1438 if (!mq->cqe_busy) 1439 blk_mq_run_hw_queues(q, true); 1440 1441 if (put_card) 1442 mmc_put_card(mq->card, &mq->ctx); 1443 } 1444 1445 void mmc_blk_cqe_recovery(struct mmc_queue *mq) 1446 { 1447 struct mmc_card *card = mq->card; 1448 struct mmc_host *host = card->host; 1449 int err; 1450 1451 pr_debug("%s: CQE recovery start\n", mmc_hostname(host)); 1452 1453 err = mmc_cqe_recovery(host); 1454 if (err) 1455 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY); 1456 else 1457 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY); 1458 1459 pr_debug("%s: CQE recovery done\n", mmc_hostname(host)); 1460 } 1461 1462 static void mmc_blk_cqe_req_done(struct mmc_request *mrq) 1463 { 1464 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req, 1465 brq.mrq); 1466 struct request *req = mmc_queue_req_to_req(mqrq); 1467 struct request_queue *q = req->q; 1468 struct mmc_queue *mq = q->queuedata; 1469 1470 /* 1471 * Block layer timeouts race with completions which means the normal 1472 * completion path cannot be used during recovery. 1473 */ 1474 if (mq->in_recovery) 1475 mmc_blk_cqe_complete_rq(mq, req); 1476 else if (likely(!blk_should_fake_timeout(req->q))) 1477 blk_mq_complete_request(req); 1478 } 1479 1480 static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq) 1481 { 1482 mrq->done = mmc_blk_cqe_req_done; 1483 mrq->recovery_notifier = mmc_cqe_recovery_notifier; 1484 1485 return mmc_cqe_start_req(host, mrq); 1486 } 1487 1488 static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq, 1489 struct request *req) 1490 { 1491 struct mmc_blk_request *brq = &mqrq->brq; 1492 1493 memset(brq, 0, sizeof(*brq)); 1494 1495 brq->mrq.cmd = &brq->cmd; 1496 brq->mrq.tag = req->tag; 1497 1498 return &brq->mrq; 1499 } 1500 1501 static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req) 1502 { 1503 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1504 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req); 1505 1506 mrq->cmd->opcode = MMC_SWITCH; 1507 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | 1508 (EXT_CSD_FLUSH_CACHE << 16) | 1509 (1 << 8) | 1510 EXT_CSD_CMD_SET_NORMAL; 1511 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B; 1512 1513 return mmc_blk_cqe_start_req(mq->card->host, mrq); 1514 } 1515 1516 static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req) 1517 { 1518 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1519 struct mmc_host *host = mq->card->host; 1520 int err; 1521 1522 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq); 1523 mqrq->brq.mrq.done = mmc_blk_hsq_req_done; 1524 mmc_pre_req(host, &mqrq->brq.mrq); 1525 1526 err = mmc_cqe_start_req(host, &mqrq->brq.mrq); 1527 if (err) 1528 mmc_post_req(host, &mqrq->brq.mrq, err); 1529 1530 return err; 1531 } 1532 1533 static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req) 1534 { 1535 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1536 struct mmc_host *host = mq->card->host; 1537 1538 if (host->hsq_enabled) 1539 return mmc_blk_hsq_issue_rw_rq(mq, req); 1540 1541 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL); 1542 1543 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq); 1544 } 1545 1546 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, 1547 struct mmc_card *card, 1548 int disable_multi, 1549 struct mmc_queue *mq) 1550 { 1551 u32 readcmd, writecmd; 1552 struct mmc_blk_request *brq = &mqrq->brq; 1553 struct request *req = mmc_queue_req_to_req(mqrq); 1554 struct mmc_blk_data *md = mq->blkdata; 1555 bool do_rel_wr, do_data_tag; 1556 1557 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag); 1558 1559 brq->mrq.cmd = &brq->cmd; 1560 1561 brq->cmd.arg = blk_rq_pos(req); 1562 if (!mmc_card_blockaddr(card)) 1563 brq->cmd.arg <<= 9; 1564 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 1565 1566 if (brq->data.blocks > 1 || do_rel_wr) { 1567 /* SPI multiblock writes terminate using a special 1568 * token, not a STOP_TRANSMISSION request. 1569 */ 1570 if (!mmc_host_is_spi(card->host) || 1571 rq_data_dir(req) == READ) 1572 brq->mrq.stop = &brq->stop; 1573 readcmd = MMC_READ_MULTIPLE_BLOCK; 1574 writecmd = MMC_WRITE_MULTIPLE_BLOCK; 1575 } else { 1576 brq->mrq.stop = NULL; 1577 readcmd = MMC_READ_SINGLE_BLOCK; 1578 writecmd = MMC_WRITE_BLOCK; 1579 } 1580 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd; 1581 1582 /* 1583 * Pre-defined multi-block transfers are preferable to 1584 * open ended-ones (and necessary for reliable writes). 1585 * However, it is not sufficient to just send CMD23, 1586 * and avoid the final CMD12, as on an error condition 1587 * CMD12 (stop) needs to be sent anyway. This, coupled 1588 * with Auto-CMD23 enhancements provided by some 1589 * hosts, means that the complexity of dealing 1590 * with this is best left to the host. If CMD23 is 1591 * supported by card and host, we'll fill sbc in and let 1592 * the host deal with handling it correctly. This means 1593 * that for hosts that don't expose MMC_CAP_CMD23, no 1594 * change of behavior will be observed. 1595 * 1596 * N.B: Some MMC cards experience perf degradation. 1597 * We'll avoid using CMD23-bounded multiblock writes for 1598 * these, while retaining features like reliable writes. 1599 */ 1600 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) && 1601 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) || 1602 do_data_tag)) { 1603 brq->sbc.opcode = MMC_SET_BLOCK_COUNT; 1604 brq->sbc.arg = brq->data.blocks | 1605 (do_rel_wr ? (1 << 31) : 0) | 1606 (do_data_tag ? (1 << 29) : 0); 1607 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC; 1608 brq->mrq.sbc = &brq->sbc; 1609 } 1610 } 1611 1612 #define MMC_MAX_RETRIES 5 1613 #define MMC_DATA_RETRIES 2 1614 #define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1) 1615 1616 static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout) 1617 { 1618 struct mmc_command cmd = { 1619 .opcode = MMC_STOP_TRANSMISSION, 1620 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC, 1621 /* Some hosts wait for busy anyway, so provide a busy timeout */ 1622 .busy_timeout = timeout, 1623 }; 1624 1625 return mmc_wait_for_cmd(card->host, &cmd, 5); 1626 } 1627 1628 static int mmc_blk_fix_state(struct mmc_card *card, struct request *req) 1629 { 1630 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1631 struct mmc_blk_request *brq = &mqrq->brq; 1632 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data); 1633 int err; 1634 1635 mmc_retune_hold_now(card->host); 1636 1637 mmc_blk_send_stop(card, timeout); 1638 1639 err = card_busy_detect(card, timeout, NULL); 1640 1641 mmc_retune_release(card->host); 1642 1643 return err; 1644 } 1645 1646 #define MMC_READ_SINGLE_RETRIES 2 1647 1648 /* Single sector read during recovery */ 1649 static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req) 1650 { 1651 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1652 struct mmc_request *mrq = &mqrq->brq.mrq; 1653 struct mmc_card *card = mq->card; 1654 struct mmc_host *host = card->host; 1655 blk_status_t error = BLK_STS_OK; 1656 int retries = 0; 1657 1658 do { 1659 u32 status; 1660 int err; 1661 1662 mmc_blk_rw_rq_prep(mqrq, card, 1, mq); 1663 1664 mmc_wait_for_req(host, mrq); 1665 1666 err = mmc_send_status(card, &status); 1667 if (err) 1668 goto error_exit; 1669 1670 if (!mmc_host_is_spi(host) && 1671 !mmc_ready_for_data(status)) { 1672 err = mmc_blk_fix_state(card, req); 1673 if (err) 1674 goto error_exit; 1675 } 1676 1677 if (mrq->cmd->error && retries++ < MMC_READ_SINGLE_RETRIES) 1678 continue; 1679 1680 retries = 0; 1681 1682 if (mrq->cmd->error || 1683 mrq->data->error || 1684 (!mmc_host_is_spi(host) && 1685 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS))) 1686 error = BLK_STS_IOERR; 1687 else 1688 error = BLK_STS_OK; 1689 1690 } while (blk_update_request(req, error, 512)); 1691 1692 return; 1693 1694 error_exit: 1695 mrq->data->bytes_xfered = 0; 1696 blk_update_request(req, BLK_STS_IOERR, 512); 1697 /* Let it try the remaining request again */ 1698 if (mqrq->retries > MMC_MAX_RETRIES - 1) 1699 mqrq->retries = MMC_MAX_RETRIES - 1; 1700 } 1701 1702 static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq) 1703 { 1704 return !!brq->mrq.sbc; 1705 } 1706 1707 static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq) 1708 { 1709 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR; 1710 } 1711 1712 /* 1713 * Check for errors the host controller driver might not have seen such as 1714 * response mode errors or invalid card state. 1715 */ 1716 static bool mmc_blk_status_error(struct request *req, u32 status) 1717 { 1718 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1719 struct mmc_blk_request *brq = &mqrq->brq; 1720 struct mmc_queue *mq = req->q->queuedata; 1721 u32 stop_err_bits; 1722 1723 if (mmc_host_is_spi(mq->card->host)) 1724 return false; 1725 1726 stop_err_bits = mmc_blk_stop_err_bits(brq); 1727 1728 return brq->cmd.resp[0] & CMD_ERRORS || 1729 brq->stop.resp[0] & stop_err_bits || 1730 status & stop_err_bits || 1731 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status)); 1732 } 1733 1734 static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq) 1735 { 1736 return !brq->sbc.error && !brq->cmd.error && 1737 !(brq->cmd.resp[0] & CMD_ERRORS); 1738 } 1739 1740 /* 1741 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple 1742 * policy: 1743 * 1. A request that has transferred at least some data is considered 1744 * successful and will be requeued if there is remaining data to 1745 * transfer. 1746 * 2. Otherwise the number of retries is incremented and the request 1747 * will be requeued if there are remaining retries. 1748 * 3. Otherwise the request will be errored out. 1749 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and 1750 * mqrq->retries. So there are only 4 possible actions here: 1751 * 1. do not accept the bytes_xfered value i.e. set it to zero 1752 * 2. change mqrq->retries to determine the number of retries 1753 * 3. try to reset the card 1754 * 4. read one sector at a time 1755 */ 1756 static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req) 1757 { 1758 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE; 1759 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1760 struct mmc_blk_request *brq = &mqrq->brq; 1761 struct mmc_blk_data *md = mq->blkdata; 1762 struct mmc_card *card = mq->card; 1763 u32 status; 1764 u32 blocks; 1765 int err; 1766 1767 /* 1768 * Some errors the host driver might not have seen. Set the number of 1769 * bytes transferred to zero in that case. 1770 */ 1771 err = __mmc_send_status(card, &status, 0); 1772 if (err || mmc_blk_status_error(req, status)) 1773 brq->data.bytes_xfered = 0; 1774 1775 mmc_retune_release(card->host); 1776 1777 /* 1778 * Try again to get the status. This also provides an opportunity for 1779 * re-tuning. 1780 */ 1781 if (err) 1782 err = __mmc_send_status(card, &status, 0); 1783 1784 /* 1785 * Nothing more to do after the number of bytes transferred has been 1786 * updated and there is no card. 1787 */ 1788 if (err && mmc_detect_card_removed(card->host)) 1789 return; 1790 1791 /* Try to get back to "tran" state */ 1792 if (!mmc_host_is_spi(mq->card->host) && 1793 (err || !mmc_ready_for_data(status))) 1794 err = mmc_blk_fix_state(mq->card, req); 1795 1796 /* 1797 * Special case for SD cards where the card might record the number of 1798 * blocks written. 1799 */ 1800 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) && 1801 rq_data_dir(req) == WRITE) { 1802 if (mmc_sd_num_wr_blocks(card, &blocks)) 1803 brq->data.bytes_xfered = 0; 1804 else 1805 brq->data.bytes_xfered = blocks << 9; 1806 } 1807 1808 /* Reset if the card is in a bad state */ 1809 if (!mmc_host_is_spi(mq->card->host) && 1810 err && mmc_blk_reset(md, card->host, type)) { 1811 pr_err("%s: recovery failed!\n", req->rq_disk->disk_name); 1812 mqrq->retries = MMC_NO_RETRIES; 1813 return; 1814 } 1815 1816 /* 1817 * If anything was done, just return and if there is anything remaining 1818 * on the request it will get requeued. 1819 */ 1820 if (brq->data.bytes_xfered) 1821 return; 1822 1823 /* Reset before last retry */ 1824 if (mqrq->retries + 1 == MMC_MAX_RETRIES) 1825 mmc_blk_reset(md, card->host, type); 1826 1827 /* Command errors fail fast, so use all MMC_MAX_RETRIES */ 1828 if (brq->sbc.error || brq->cmd.error) 1829 return; 1830 1831 /* Reduce the remaining retries for data errors */ 1832 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) { 1833 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES; 1834 return; 1835 } 1836 1837 /* FIXME: Missing single sector read for large sector size */ 1838 if (!mmc_large_sector(card) && rq_data_dir(req) == READ && 1839 brq->data.blocks > 1) { 1840 /* Read one sector at a time */ 1841 mmc_blk_read_single(mq, req); 1842 return; 1843 } 1844 } 1845 1846 static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq) 1847 { 1848 mmc_blk_eval_resp_error(brq); 1849 1850 return brq->sbc.error || brq->cmd.error || brq->stop.error || 1851 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS; 1852 } 1853 1854 static int mmc_blk_card_busy(struct mmc_card *card, struct request *req) 1855 { 1856 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1857 u32 status = 0; 1858 int err; 1859 1860 if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ) 1861 return 0; 1862 1863 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status); 1864 1865 /* 1866 * Do not assume data transferred correctly if there are any error bits 1867 * set. 1868 */ 1869 if (status & mmc_blk_stop_err_bits(&mqrq->brq)) { 1870 mqrq->brq.data.bytes_xfered = 0; 1871 err = err ? err : -EIO; 1872 } 1873 1874 /* Copy the exception bit so it will be seen later on */ 1875 if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT) 1876 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT; 1877 1878 return err; 1879 } 1880 1881 static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq, 1882 struct request *req) 1883 { 1884 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE; 1885 1886 mmc_blk_reset_success(mq->blkdata, type); 1887 } 1888 1889 static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req) 1890 { 1891 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1892 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered; 1893 1894 if (nr_bytes) { 1895 if (blk_update_request(req, BLK_STS_OK, nr_bytes)) 1896 blk_mq_requeue_request(req, true); 1897 else 1898 __blk_mq_end_request(req, BLK_STS_OK); 1899 } else if (!blk_rq_bytes(req)) { 1900 __blk_mq_end_request(req, BLK_STS_IOERR); 1901 } else if (mqrq->retries++ < MMC_MAX_RETRIES) { 1902 blk_mq_requeue_request(req, true); 1903 } else { 1904 if (mmc_card_removed(mq->card)) 1905 req->rq_flags |= RQF_QUIET; 1906 blk_mq_end_request(req, BLK_STS_IOERR); 1907 } 1908 } 1909 1910 static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq, 1911 struct mmc_queue_req *mqrq) 1912 { 1913 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) && 1914 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT || 1915 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT); 1916 } 1917 1918 static void mmc_blk_urgent_bkops(struct mmc_queue *mq, 1919 struct mmc_queue_req *mqrq) 1920 { 1921 if (mmc_blk_urgent_bkops_needed(mq, mqrq)) 1922 mmc_run_bkops(mq->card); 1923 } 1924 1925 static void mmc_blk_hsq_req_done(struct mmc_request *mrq) 1926 { 1927 struct mmc_queue_req *mqrq = 1928 container_of(mrq, struct mmc_queue_req, brq.mrq); 1929 struct request *req = mmc_queue_req_to_req(mqrq); 1930 struct request_queue *q = req->q; 1931 struct mmc_queue *mq = q->queuedata; 1932 struct mmc_host *host = mq->card->host; 1933 unsigned long flags; 1934 1935 if (mmc_blk_rq_error(&mqrq->brq) || 1936 mmc_blk_urgent_bkops_needed(mq, mqrq)) { 1937 spin_lock_irqsave(&mq->lock, flags); 1938 mq->recovery_needed = true; 1939 mq->recovery_req = req; 1940 spin_unlock_irqrestore(&mq->lock, flags); 1941 1942 host->cqe_ops->cqe_recovery_start(host); 1943 1944 schedule_work(&mq->recovery_work); 1945 return; 1946 } 1947 1948 mmc_blk_rw_reset_success(mq, req); 1949 1950 /* 1951 * Block layer timeouts race with completions which means the normal 1952 * completion path cannot be used during recovery. 1953 */ 1954 if (mq->in_recovery) 1955 mmc_blk_cqe_complete_rq(mq, req); 1956 else if (likely(!blk_should_fake_timeout(req->q))) 1957 blk_mq_complete_request(req); 1958 } 1959 1960 void mmc_blk_mq_complete(struct request *req) 1961 { 1962 struct mmc_queue *mq = req->q->queuedata; 1963 struct mmc_host *host = mq->card->host; 1964 1965 if (host->cqe_enabled) 1966 mmc_blk_cqe_complete_rq(mq, req); 1967 else if (likely(!blk_should_fake_timeout(req->q))) 1968 mmc_blk_mq_complete_rq(mq, req); 1969 } 1970 1971 static void mmc_blk_mq_poll_completion(struct mmc_queue *mq, 1972 struct request *req) 1973 { 1974 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 1975 struct mmc_host *host = mq->card->host; 1976 1977 if (mmc_blk_rq_error(&mqrq->brq) || 1978 mmc_blk_card_busy(mq->card, req)) { 1979 mmc_blk_mq_rw_recovery(mq, req); 1980 } else { 1981 mmc_blk_rw_reset_success(mq, req); 1982 mmc_retune_release(host); 1983 } 1984 1985 mmc_blk_urgent_bkops(mq, mqrq); 1986 } 1987 1988 static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req) 1989 { 1990 unsigned long flags; 1991 bool put_card; 1992 1993 spin_lock_irqsave(&mq->lock, flags); 1994 1995 mq->in_flight[mmc_issue_type(mq, req)] -= 1; 1996 1997 put_card = (mmc_tot_in_flight(mq) == 0); 1998 1999 spin_unlock_irqrestore(&mq->lock, flags); 2000 2001 if (put_card) 2002 mmc_put_card(mq->card, &mq->ctx); 2003 } 2004 2005 static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req) 2006 { 2007 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 2008 struct mmc_request *mrq = &mqrq->brq.mrq; 2009 struct mmc_host *host = mq->card->host; 2010 2011 mmc_post_req(host, mrq, 0); 2012 2013 /* 2014 * Block layer timeouts race with completions which means the normal 2015 * completion path cannot be used during recovery. 2016 */ 2017 if (mq->in_recovery) 2018 mmc_blk_mq_complete_rq(mq, req); 2019 else if (likely(!blk_should_fake_timeout(req->q))) 2020 blk_mq_complete_request(req); 2021 2022 mmc_blk_mq_dec_in_flight(mq, req); 2023 } 2024 2025 void mmc_blk_mq_recovery(struct mmc_queue *mq) 2026 { 2027 struct request *req = mq->recovery_req; 2028 struct mmc_host *host = mq->card->host; 2029 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 2030 2031 mq->recovery_req = NULL; 2032 mq->rw_wait = false; 2033 2034 if (mmc_blk_rq_error(&mqrq->brq)) { 2035 mmc_retune_hold_now(host); 2036 mmc_blk_mq_rw_recovery(mq, req); 2037 } 2038 2039 mmc_blk_urgent_bkops(mq, mqrq); 2040 2041 mmc_blk_mq_post_req(mq, req); 2042 } 2043 2044 static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq, 2045 struct request **prev_req) 2046 { 2047 if (mmc_host_done_complete(mq->card->host)) 2048 return; 2049 2050 mutex_lock(&mq->complete_lock); 2051 2052 if (!mq->complete_req) 2053 goto out_unlock; 2054 2055 mmc_blk_mq_poll_completion(mq, mq->complete_req); 2056 2057 if (prev_req) 2058 *prev_req = mq->complete_req; 2059 else 2060 mmc_blk_mq_post_req(mq, mq->complete_req); 2061 2062 mq->complete_req = NULL; 2063 2064 out_unlock: 2065 mutex_unlock(&mq->complete_lock); 2066 } 2067 2068 void mmc_blk_mq_complete_work(struct work_struct *work) 2069 { 2070 struct mmc_queue *mq = container_of(work, struct mmc_queue, 2071 complete_work); 2072 2073 mmc_blk_mq_complete_prev_req(mq, NULL); 2074 } 2075 2076 static void mmc_blk_mq_req_done(struct mmc_request *mrq) 2077 { 2078 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req, 2079 brq.mrq); 2080 struct request *req = mmc_queue_req_to_req(mqrq); 2081 struct request_queue *q = req->q; 2082 struct mmc_queue *mq = q->queuedata; 2083 struct mmc_host *host = mq->card->host; 2084 unsigned long flags; 2085 2086 if (!mmc_host_done_complete(host)) { 2087 bool waiting; 2088 2089 /* 2090 * We cannot complete the request in this context, so record 2091 * that there is a request to complete, and that a following 2092 * request does not need to wait (although it does need to 2093 * complete complete_req first). 2094 */ 2095 spin_lock_irqsave(&mq->lock, flags); 2096 mq->complete_req = req; 2097 mq->rw_wait = false; 2098 waiting = mq->waiting; 2099 spin_unlock_irqrestore(&mq->lock, flags); 2100 2101 /* 2102 * If 'waiting' then the waiting task will complete this 2103 * request, otherwise queue a work to do it. Note that 2104 * complete_work may still race with the dispatch of a following 2105 * request. 2106 */ 2107 if (waiting) 2108 wake_up(&mq->wait); 2109 else 2110 queue_work(mq->card->complete_wq, &mq->complete_work); 2111 2112 return; 2113 } 2114 2115 /* Take the recovery path for errors or urgent background operations */ 2116 if (mmc_blk_rq_error(&mqrq->brq) || 2117 mmc_blk_urgent_bkops_needed(mq, mqrq)) { 2118 spin_lock_irqsave(&mq->lock, flags); 2119 mq->recovery_needed = true; 2120 mq->recovery_req = req; 2121 spin_unlock_irqrestore(&mq->lock, flags); 2122 wake_up(&mq->wait); 2123 schedule_work(&mq->recovery_work); 2124 return; 2125 } 2126 2127 mmc_blk_rw_reset_success(mq, req); 2128 2129 mq->rw_wait = false; 2130 wake_up(&mq->wait); 2131 2132 mmc_blk_mq_post_req(mq, req); 2133 } 2134 2135 static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err) 2136 { 2137 unsigned long flags; 2138 bool done; 2139 2140 /* 2141 * Wait while there is another request in progress, but not if recovery 2142 * is needed. Also indicate whether there is a request waiting to start. 2143 */ 2144 spin_lock_irqsave(&mq->lock, flags); 2145 if (mq->recovery_needed) { 2146 *err = -EBUSY; 2147 done = true; 2148 } else { 2149 done = !mq->rw_wait; 2150 } 2151 mq->waiting = !done; 2152 spin_unlock_irqrestore(&mq->lock, flags); 2153 2154 return done; 2155 } 2156 2157 static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req) 2158 { 2159 int err = 0; 2160 2161 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err)); 2162 2163 /* Always complete the previous request if there is one */ 2164 mmc_blk_mq_complete_prev_req(mq, prev_req); 2165 2166 return err; 2167 } 2168 2169 static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq, 2170 struct request *req) 2171 { 2172 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); 2173 struct mmc_host *host = mq->card->host; 2174 struct request *prev_req = NULL; 2175 int err = 0; 2176 2177 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq); 2178 2179 mqrq->brq.mrq.done = mmc_blk_mq_req_done; 2180 2181 mmc_pre_req(host, &mqrq->brq.mrq); 2182 2183 err = mmc_blk_rw_wait(mq, &prev_req); 2184 if (err) 2185 goto out_post_req; 2186 2187 mq->rw_wait = true; 2188 2189 err = mmc_start_request(host, &mqrq->brq.mrq); 2190 2191 if (prev_req) 2192 mmc_blk_mq_post_req(mq, prev_req); 2193 2194 if (err) 2195 mq->rw_wait = false; 2196 2197 /* Release re-tuning here where there is no synchronization required */ 2198 if (err || mmc_host_done_complete(host)) 2199 mmc_retune_release(host); 2200 2201 out_post_req: 2202 if (err) 2203 mmc_post_req(host, &mqrq->brq.mrq, err); 2204 2205 return err; 2206 } 2207 2208 static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host) 2209 { 2210 if (host->cqe_enabled) 2211 return host->cqe_ops->cqe_wait_for_idle(host); 2212 2213 return mmc_blk_rw_wait(mq, NULL); 2214 } 2215 2216 enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req) 2217 { 2218 struct mmc_blk_data *md = mq->blkdata; 2219 struct mmc_card *card = md->queue.card; 2220 struct mmc_host *host = card->host; 2221 int ret; 2222 2223 ret = mmc_blk_part_switch(card, md->part_type); 2224 if (ret) 2225 return MMC_REQ_FAILED_TO_START; 2226 2227 switch (mmc_issue_type(mq, req)) { 2228 case MMC_ISSUE_SYNC: 2229 ret = mmc_blk_wait_for_idle(mq, host); 2230 if (ret) 2231 return MMC_REQ_BUSY; 2232 switch (req_op(req)) { 2233 case REQ_OP_DRV_IN: 2234 case REQ_OP_DRV_OUT: 2235 mmc_blk_issue_drv_op(mq, req); 2236 break; 2237 case REQ_OP_DISCARD: 2238 mmc_blk_issue_discard_rq(mq, req); 2239 break; 2240 case REQ_OP_SECURE_ERASE: 2241 mmc_blk_issue_secdiscard_rq(mq, req); 2242 break; 2243 case REQ_OP_FLUSH: 2244 mmc_blk_issue_flush(mq, req); 2245 break; 2246 default: 2247 WARN_ON_ONCE(1); 2248 return MMC_REQ_FAILED_TO_START; 2249 } 2250 return MMC_REQ_FINISHED; 2251 case MMC_ISSUE_DCMD: 2252 case MMC_ISSUE_ASYNC: 2253 switch (req_op(req)) { 2254 case REQ_OP_FLUSH: 2255 if (!mmc_cache_enabled(host)) { 2256 blk_mq_end_request(req, BLK_STS_OK); 2257 return MMC_REQ_FINISHED; 2258 } 2259 ret = mmc_blk_cqe_issue_flush(mq, req); 2260 break; 2261 case REQ_OP_READ: 2262 case REQ_OP_WRITE: 2263 if (host->cqe_enabled) 2264 ret = mmc_blk_cqe_issue_rw_rq(mq, req); 2265 else 2266 ret = mmc_blk_mq_issue_rw_rq(mq, req); 2267 break; 2268 default: 2269 WARN_ON_ONCE(1); 2270 ret = -EINVAL; 2271 } 2272 if (!ret) 2273 return MMC_REQ_STARTED; 2274 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START; 2275 default: 2276 WARN_ON_ONCE(1); 2277 return MMC_REQ_FAILED_TO_START; 2278 } 2279 } 2280 2281 static inline int mmc_blk_readonly(struct mmc_card *card) 2282 { 2283 return mmc_card_readonly(card) || 2284 !(card->csd.cmdclass & CCC_BLOCK_WRITE); 2285 } 2286 2287 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, 2288 struct device *parent, 2289 sector_t size, 2290 bool default_ro, 2291 const char *subname, 2292 int area_type) 2293 { 2294 struct mmc_blk_data *md; 2295 int devidx, ret; 2296 char cap_str[10]; 2297 2298 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL); 2299 if (devidx < 0) { 2300 /* 2301 * We get -ENOSPC because there are no more any available 2302 * devidx. The reason may be that, either userspace haven't yet 2303 * unmounted the partitions, which postpones mmc_blk_release() 2304 * from being called, or the device has more partitions than 2305 * what we support. 2306 */ 2307 if (devidx == -ENOSPC) 2308 dev_err(mmc_dev(card->host), 2309 "no more device IDs available\n"); 2310 2311 return ERR_PTR(devidx); 2312 } 2313 2314 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); 2315 if (!md) { 2316 ret = -ENOMEM; 2317 goto out; 2318 } 2319 2320 md->area_type = area_type; 2321 2322 /* 2323 * Set the read-only status based on the supported commands 2324 * and the write protect switch. 2325 */ 2326 md->read_only = mmc_blk_readonly(card); 2327 2328 md->disk = mmc_init_queue(&md->queue, card); 2329 if (IS_ERR(md->disk)) { 2330 ret = PTR_ERR(md->disk); 2331 goto err_kfree; 2332 } 2333 2334 INIT_LIST_HEAD(&md->part); 2335 INIT_LIST_HEAD(&md->rpmbs); 2336 kref_init(&md->kref); 2337 2338 md->queue.blkdata = md; 2339 2340 md->disk->major = MMC_BLOCK_MAJOR; 2341 md->disk->minors = perdev_minors; 2342 md->disk->first_minor = devidx * perdev_minors; 2343 md->disk->fops = &mmc_bdops; 2344 md->disk->private_data = md; 2345 md->parent = parent; 2346 set_disk_ro(md->disk, md->read_only || default_ro); 2347 md->disk->flags = GENHD_FL_EXT_DEVT; 2348 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT)) 2349 md->disk->flags |= GENHD_FL_NO_PART_SCAN 2350 | GENHD_FL_SUPPRESS_PARTITION_INFO; 2351 2352 /* 2353 * As discussed on lkml, GENHD_FL_REMOVABLE should: 2354 * 2355 * - be set for removable media with permanent block devices 2356 * - be unset for removable block devices with permanent media 2357 * 2358 * Since MMC block devices clearly fall under the second 2359 * case, we do not set GENHD_FL_REMOVABLE. Userspace 2360 * should use the block device creation/destruction hotplug 2361 * messages to tell when the card is present. 2362 */ 2363 2364 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name), 2365 "mmcblk%u%s", card->host->index, subname ? subname : ""); 2366 2367 set_capacity(md->disk, size); 2368 2369 if (mmc_host_cmd23(card->host)) { 2370 if ((mmc_card_mmc(card) && 2371 card->csd.mmca_vsn >= CSD_SPEC_VER_3) || 2372 (mmc_card_sd(card) && 2373 card->scr.cmds & SD_SCR_CMD23_SUPPORT)) 2374 md->flags |= MMC_BLK_CMD23; 2375 } 2376 2377 if (mmc_card_mmc(card) && 2378 md->flags & MMC_BLK_CMD23 && 2379 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) || 2380 card->ext_csd.rel_sectors)) { 2381 md->flags |= MMC_BLK_REL_WR; 2382 blk_queue_write_cache(md->queue.queue, true, true); 2383 } 2384 2385 string_get_size((u64)size, 512, STRING_UNITS_2, 2386 cap_str, sizeof(cap_str)); 2387 pr_info("%s: %s %s %s %s\n", 2388 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), 2389 cap_str, md->read_only ? "(ro)" : ""); 2390 2391 return md; 2392 2393 err_kfree: 2394 kfree(md); 2395 out: 2396 ida_simple_remove(&mmc_blk_ida, devidx); 2397 return ERR_PTR(ret); 2398 } 2399 2400 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) 2401 { 2402 sector_t size; 2403 2404 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { 2405 /* 2406 * The EXT_CSD sector count is in number or 512 byte 2407 * sectors. 2408 */ 2409 size = card->ext_csd.sectors; 2410 } else { 2411 /* 2412 * The CSD capacity field is in units of read_blkbits. 2413 * set_capacity takes units of 512 bytes. 2414 */ 2415 size = (typeof(sector_t))card->csd.capacity 2416 << (card->csd.read_blkbits - 9); 2417 } 2418 2419 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL, 2420 MMC_BLK_DATA_AREA_MAIN); 2421 } 2422 2423 static int mmc_blk_alloc_part(struct mmc_card *card, 2424 struct mmc_blk_data *md, 2425 unsigned int part_type, 2426 sector_t size, 2427 bool default_ro, 2428 const char *subname, 2429 int area_type) 2430 { 2431 struct mmc_blk_data *part_md; 2432 2433 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro, 2434 subname, area_type); 2435 if (IS_ERR(part_md)) 2436 return PTR_ERR(part_md); 2437 part_md->part_type = part_type; 2438 list_add(&part_md->part, &md->part); 2439 2440 return 0; 2441 } 2442 2443 /** 2444 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev 2445 * @filp: the character device file 2446 * @cmd: the ioctl() command 2447 * @arg: the argument from userspace 2448 * 2449 * This will essentially just redirect the ioctl()s coming in over to 2450 * the main block device spawning the RPMB character device. 2451 */ 2452 static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd, 2453 unsigned long arg) 2454 { 2455 struct mmc_rpmb_data *rpmb = filp->private_data; 2456 int ret; 2457 2458 switch (cmd) { 2459 case MMC_IOC_CMD: 2460 ret = mmc_blk_ioctl_cmd(rpmb->md, 2461 (struct mmc_ioc_cmd __user *)arg, 2462 rpmb); 2463 break; 2464 case MMC_IOC_MULTI_CMD: 2465 ret = mmc_blk_ioctl_multi_cmd(rpmb->md, 2466 (struct mmc_ioc_multi_cmd __user *)arg, 2467 rpmb); 2468 break; 2469 default: 2470 ret = -EINVAL; 2471 break; 2472 } 2473 2474 return ret; 2475 } 2476 2477 #ifdef CONFIG_COMPAT 2478 static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd, 2479 unsigned long arg) 2480 { 2481 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); 2482 } 2483 #endif 2484 2485 static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp) 2486 { 2487 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev, 2488 struct mmc_rpmb_data, chrdev); 2489 2490 get_device(&rpmb->dev); 2491 filp->private_data = rpmb; 2492 mmc_blk_get(rpmb->md->disk); 2493 2494 return nonseekable_open(inode, filp); 2495 } 2496 2497 static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp) 2498 { 2499 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev, 2500 struct mmc_rpmb_data, chrdev); 2501 2502 mmc_blk_put(rpmb->md); 2503 put_device(&rpmb->dev); 2504 2505 return 0; 2506 } 2507 2508 static const struct file_operations mmc_rpmb_fileops = { 2509 .release = mmc_rpmb_chrdev_release, 2510 .open = mmc_rpmb_chrdev_open, 2511 .owner = THIS_MODULE, 2512 .llseek = no_llseek, 2513 .unlocked_ioctl = mmc_rpmb_ioctl, 2514 #ifdef CONFIG_COMPAT 2515 .compat_ioctl = mmc_rpmb_ioctl_compat, 2516 #endif 2517 }; 2518 2519 static void mmc_blk_rpmb_device_release(struct device *dev) 2520 { 2521 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev); 2522 2523 ida_simple_remove(&mmc_rpmb_ida, rpmb->id); 2524 kfree(rpmb); 2525 } 2526 2527 static int mmc_blk_alloc_rpmb_part(struct mmc_card *card, 2528 struct mmc_blk_data *md, 2529 unsigned int part_index, 2530 sector_t size, 2531 const char *subname) 2532 { 2533 int devidx, ret; 2534 char rpmb_name[DISK_NAME_LEN]; 2535 char cap_str[10]; 2536 struct mmc_rpmb_data *rpmb; 2537 2538 /* This creates the minor number for the RPMB char device */ 2539 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL); 2540 if (devidx < 0) 2541 return devidx; 2542 2543 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL); 2544 if (!rpmb) { 2545 ida_simple_remove(&mmc_rpmb_ida, devidx); 2546 return -ENOMEM; 2547 } 2548 2549 snprintf(rpmb_name, sizeof(rpmb_name), 2550 "mmcblk%u%s", card->host->index, subname ? subname : ""); 2551 2552 rpmb->id = devidx; 2553 rpmb->part_index = part_index; 2554 rpmb->dev.init_name = rpmb_name; 2555 rpmb->dev.bus = &mmc_rpmb_bus_type; 2556 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id); 2557 rpmb->dev.parent = &card->dev; 2558 rpmb->dev.release = mmc_blk_rpmb_device_release; 2559 device_initialize(&rpmb->dev); 2560 dev_set_drvdata(&rpmb->dev, rpmb); 2561 rpmb->md = md; 2562 2563 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops); 2564 rpmb->chrdev.owner = THIS_MODULE; 2565 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev); 2566 if (ret) { 2567 pr_err("%s: could not add character device\n", rpmb_name); 2568 goto out_put_device; 2569 } 2570 2571 list_add(&rpmb->node, &md->rpmbs); 2572 2573 string_get_size((u64)size, 512, STRING_UNITS_2, 2574 cap_str, sizeof(cap_str)); 2575 2576 pr_info("%s: %s %s %s, chardev (%d:%d)\n", 2577 rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str, 2578 MAJOR(mmc_rpmb_devt), rpmb->id); 2579 2580 return 0; 2581 2582 out_put_device: 2583 put_device(&rpmb->dev); 2584 return ret; 2585 } 2586 2587 static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb) 2588 2589 { 2590 cdev_device_del(&rpmb->chrdev, &rpmb->dev); 2591 put_device(&rpmb->dev); 2592 } 2593 2594 /* MMC Physical partitions consist of two boot partitions and 2595 * up to four general purpose partitions. 2596 * For each partition enabled in EXT_CSD a block device will be allocatedi 2597 * to provide access to the partition. 2598 */ 2599 2600 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md) 2601 { 2602 int idx, ret; 2603 2604 if (!mmc_card_mmc(card)) 2605 return 0; 2606 2607 for (idx = 0; idx < card->nr_parts; idx++) { 2608 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) { 2609 /* 2610 * RPMB partitions does not provide block access, they 2611 * are only accessed using ioctl():s. Thus create 2612 * special RPMB block devices that do not have a 2613 * backing block queue for these. 2614 */ 2615 ret = mmc_blk_alloc_rpmb_part(card, md, 2616 card->part[idx].part_cfg, 2617 card->part[idx].size >> 9, 2618 card->part[idx].name); 2619 if (ret) 2620 return ret; 2621 } else if (card->part[idx].size) { 2622 ret = mmc_blk_alloc_part(card, md, 2623 card->part[idx].part_cfg, 2624 card->part[idx].size >> 9, 2625 card->part[idx].force_ro, 2626 card->part[idx].name, 2627 card->part[idx].area_type); 2628 if (ret) 2629 return ret; 2630 } 2631 } 2632 2633 return 0; 2634 } 2635 2636 static void mmc_blk_remove_req(struct mmc_blk_data *md) 2637 { 2638 struct mmc_card *card; 2639 2640 if (md) { 2641 /* 2642 * Flush remaining requests and free queues. It 2643 * is freeing the queue that stops new requests 2644 * from being accepted. 2645 */ 2646 card = md->queue.card; 2647 if (md->disk->flags & GENHD_FL_UP) { 2648 device_remove_file(disk_to_dev(md->disk), &md->force_ro); 2649 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) && 2650 card->ext_csd.boot_ro_lockable) 2651 device_remove_file(disk_to_dev(md->disk), 2652 &md->power_ro_lock); 2653 2654 del_gendisk(md->disk); 2655 } 2656 mmc_cleanup_queue(&md->queue); 2657 mmc_blk_put(md); 2658 } 2659 } 2660 2661 static void mmc_blk_remove_parts(struct mmc_card *card, 2662 struct mmc_blk_data *md) 2663 { 2664 struct list_head *pos, *q; 2665 struct mmc_blk_data *part_md; 2666 struct mmc_rpmb_data *rpmb; 2667 2668 /* Remove RPMB partitions */ 2669 list_for_each_safe(pos, q, &md->rpmbs) { 2670 rpmb = list_entry(pos, struct mmc_rpmb_data, node); 2671 list_del(pos); 2672 mmc_blk_remove_rpmb_part(rpmb); 2673 } 2674 /* Remove block partitions */ 2675 list_for_each_safe(pos, q, &md->part) { 2676 part_md = list_entry(pos, struct mmc_blk_data, part); 2677 list_del(pos); 2678 mmc_blk_remove_req(part_md); 2679 } 2680 } 2681 2682 static int mmc_add_disk(struct mmc_blk_data *md) 2683 { 2684 int ret; 2685 struct mmc_card *card = md->queue.card; 2686 2687 device_add_disk(md->parent, md->disk, NULL); 2688 md->force_ro.show = force_ro_show; 2689 md->force_ro.store = force_ro_store; 2690 sysfs_attr_init(&md->force_ro.attr); 2691 md->force_ro.attr.name = "force_ro"; 2692 md->force_ro.attr.mode = S_IRUGO | S_IWUSR; 2693 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro); 2694 if (ret) 2695 goto force_ro_fail; 2696 2697 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) && 2698 card->ext_csd.boot_ro_lockable) { 2699 umode_t mode; 2700 2701 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS) 2702 mode = S_IRUGO; 2703 else 2704 mode = S_IRUGO | S_IWUSR; 2705 2706 md->power_ro_lock.show = power_ro_lock_show; 2707 md->power_ro_lock.store = power_ro_lock_store; 2708 sysfs_attr_init(&md->power_ro_lock.attr); 2709 md->power_ro_lock.attr.mode = mode; 2710 md->power_ro_lock.attr.name = 2711 "ro_lock_until_next_power_on"; 2712 ret = device_create_file(disk_to_dev(md->disk), 2713 &md->power_ro_lock); 2714 if (ret) 2715 goto power_ro_lock_fail; 2716 } 2717 return ret; 2718 2719 power_ro_lock_fail: 2720 device_remove_file(disk_to_dev(md->disk), &md->force_ro); 2721 force_ro_fail: 2722 del_gendisk(md->disk); 2723 2724 return ret; 2725 } 2726 2727 #ifdef CONFIG_DEBUG_FS 2728 2729 static int mmc_dbg_card_status_get(void *data, u64 *val) 2730 { 2731 struct mmc_card *card = data; 2732 struct mmc_blk_data *md = dev_get_drvdata(&card->dev); 2733 struct mmc_queue *mq = &md->queue; 2734 struct request *req; 2735 int ret; 2736 2737 /* Ask the block layer about the card status */ 2738 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0); 2739 if (IS_ERR(req)) 2740 return PTR_ERR(req); 2741 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS; 2742 blk_execute_rq(NULL, req, 0); 2743 ret = req_to_mmc_queue_req(req)->drv_op_result; 2744 if (ret >= 0) { 2745 *val = ret; 2746 ret = 0; 2747 } 2748 blk_put_request(req); 2749 2750 return ret; 2751 } 2752 DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, 2753 NULL, "%08llx\n"); 2754 2755 /* That is two digits * 512 + 1 for newline */ 2756 #define EXT_CSD_STR_LEN 1025 2757 2758 static int mmc_ext_csd_open(struct inode *inode, struct file *filp) 2759 { 2760 struct mmc_card *card = inode->i_private; 2761 struct mmc_blk_data *md = dev_get_drvdata(&card->dev); 2762 struct mmc_queue *mq = &md->queue; 2763 struct request *req; 2764 char *buf; 2765 ssize_t n = 0; 2766 u8 *ext_csd; 2767 int err, i; 2768 2769 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); 2770 if (!buf) 2771 return -ENOMEM; 2772 2773 /* Ask the block layer for the EXT CSD */ 2774 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0); 2775 if (IS_ERR(req)) { 2776 err = PTR_ERR(req); 2777 goto out_free; 2778 } 2779 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD; 2780 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd; 2781 blk_execute_rq(NULL, req, 0); 2782 err = req_to_mmc_queue_req(req)->drv_op_result; 2783 blk_put_request(req); 2784 if (err) { 2785 pr_err("FAILED %d\n", err); 2786 goto out_free; 2787 } 2788 2789 for (i = 0; i < 512; i++) 2790 n += sprintf(buf + n, "%02x", ext_csd[i]); 2791 n += sprintf(buf + n, "\n"); 2792 2793 if (n != EXT_CSD_STR_LEN) { 2794 err = -EINVAL; 2795 kfree(ext_csd); 2796 goto out_free; 2797 } 2798 2799 filp->private_data = buf; 2800 kfree(ext_csd); 2801 return 0; 2802 2803 out_free: 2804 kfree(buf); 2805 return err; 2806 } 2807 2808 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, 2809 size_t cnt, loff_t *ppos) 2810 { 2811 char *buf = filp->private_data; 2812 2813 return simple_read_from_buffer(ubuf, cnt, ppos, 2814 buf, EXT_CSD_STR_LEN); 2815 } 2816 2817 static int mmc_ext_csd_release(struct inode *inode, struct file *file) 2818 { 2819 kfree(file->private_data); 2820 return 0; 2821 } 2822 2823 static const struct file_operations mmc_dbg_ext_csd_fops = { 2824 .open = mmc_ext_csd_open, 2825 .read = mmc_ext_csd_read, 2826 .release = mmc_ext_csd_release, 2827 .llseek = default_llseek, 2828 }; 2829 2830 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md) 2831 { 2832 struct dentry *root; 2833 2834 if (!card->debugfs_root) 2835 return 0; 2836 2837 root = card->debugfs_root; 2838 2839 if (mmc_card_mmc(card) || mmc_card_sd(card)) { 2840 md->status_dentry = 2841 debugfs_create_file_unsafe("status", 0400, root, 2842 card, 2843 &mmc_dbg_card_status_fops); 2844 if (!md->status_dentry) 2845 return -EIO; 2846 } 2847 2848 if (mmc_card_mmc(card)) { 2849 md->ext_csd_dentry = 2850 debugfs_create_file("ext_csd", S_IRUSR, root, card, 2851 &mmc_dbg_ext_csd_fops); 2852 if (!md->ext_csd_dentry) 2853 return -EIO; 2854 } 2855 2856 return 0; 2857 } 2858 2859 static void mmc_blk_remove_debugfs(struct mmc_card *card, 2860 struct mmc_blk_data *md) 2861 { 2862 if (!card->debugfs_root) 2863 return; 2864 2865 if (!IS_ERR_OR_NULL(md->status_dentry)) { 2866 debugfs_remove(md->status_dentry); 2867 md->status_dentry = NULL; 2868 } 2869 2870 if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) { 2871 debugfs_remove(md->ext_csd_dentry); 2872 md->ext_csd_dentry = NULL; 2873 } 2874 } 2875 2876 #else 2877 2878 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md) 2879 { 2880 return 0; 2881 } 2882 2883 static void mmc_blk_remove_debugfs(struct mmc_card *card, 2884 struct mmc_blk_data *md) 2885 { 2886 } 2887 2888 #endif /* CONFIG_DEBUG_FS */ 2889 2890 static int mmc_blk_probe(struct mmc_card *card) 2891 { 2892 struct mmc_blk_data *md, *part_md; 2893 int ret = 0; 2894 2895 /* 2896 * Check that the card supports the command class(es) we need. 2897 */ 2898 if (!(card->csd.cmdclass & CCC_BLOCK_READ)) 2899 return -ENODEV; 2900 2901 mmc_fixup_device(card, mmc_blk_fixups); 2902 2903 card->complete_wq = alloc_workqueue("mmc_complete", 2904 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); 2905 if (!card->complete_wq) { 2906 pr_err("Failed to create mmc completion workqueue"); 2907 return -ENOMEM; 2908 } 2909 2910 md = mmc_blk_alloc(card); 2911 if (IS_ERR(md)) { 2912 ret = PTR_ERR(md); 2913 goto out_free; 2914 } 2915 2916 ret = mmc_blk_alloc_parts(card, md); 2917 if (ret) 2918 goto out; 2919 2920 dev_set_drvdata(&card->dev, md); 2921 2922 ret = mmc_add_disk(md); 2923 if (ret) 2924 goto out; 2925 2926 list_for_each_entry(part_md, &md->part, part) { 2927 ret = mmc_add_disk(part_md); 2928 if (ret) 2929 goto out; 2930 } 2931 2932 /* Add two debugfs entries */ 2933 mmc_blk_add_debugfs(card, md); 2934 2935 pm_runtime_set_autosuspend_delay(&card->dev, 3000); 2936 pm_runtime_use_autosuspend(&card->dev); 2937 2938 /* 2939 * Don't enable runtime PM for SD-combo cards here. Leave that 2940 * decision to be taken during the SDIO init sequence instead. 2941 */ 2942 if (card->type != MMC_TYPE_SD_COMBO) { 2943 pm_runtime_set_active(&card->dev); 2944 pm_runtime_enable(&card->dev); 2945 } 2946 2947 return 0; 2948 2949 out: 2950 mmc_blk_remove_parts(card, md); 2951 mmc_blk_remove_req(md); 2952 out_free: 2953 destroy_workqueue(card->complete_wq); 2954 return ret; 2955 } 2956 2957 static void mmc_blk_remove(struct mmc_card *card) 2958 { 2959 struct mmc_blk_data *md = dev_get_drvdata(&card->dev); 2960 2961 mmc_blk_remove_debugfs(card, md); 2962 mmc_blk_remove_parts(card, md); 2963 pm_runtime_get_sync(&card->dev); 2964 if (md->part_curr != md->part_type) { 2965 mmc_claim_host(card->host); 2966 mmc_blk_part_switch(card, md->part_type); 2967 mmc_release_host(card->host); 2968 } 2969 if (card->type != MMC_TYPE_SD_COMBO) 2970 pm_runtime_disable(&card->dev); 2971 pm_runtime_put_noidle(&card->dev); 2972 mmc_blk_remove_req(md); 2973 dev_set_drvdata(&card->dev, NULL); 2974 destroy_workqueue(card->complete_wq); 2975 } 2976 2977 static int _mmc_blk_suspend(struct mmc_card *card) 2978 { 2979 struct mmc_blk_data *part_md; 2980 struct mmc_blk_data *md = dev_get_drvdata(&card->dev); 2981 2982 if (md) { 2983 mmc_queue_suspend(&md->queue); 2984 list_for_each_entry(part_md, &md->part, part) { 2985 mmc_queue_suspend(&part_md->queue); 2986 } 2987 } 2988 return 0; 2989 } 2990 2991 static void mmc_blk_shutdown(struct mmc_card *card) 2992 { 2993 _mmc_blk_suspend(card); 2994 } 2995 2996 #ifdef CONFIG_PM_SLEEP 2997 static int mmc_blk_suspend(struct device *dev) 2998 { 2999 struct mmc_card *card = mmc_dev_to_card(dev); 3000 3001 return _mmc_blk_suspend(card); 3002 } 3003 3004 static int mmc_blk_resume(struct device *dev) 3005 { 3006 struct mmc_blk_data *part_md; 3007 struct mmc_blk_data *md = dev_get_drvdata(dev); 3008 3009 if (md) { 3010 /* 3011 * Resume involves the card going into idle state, 3012 * so current partition is always the main one. 3013 */ 3014 md->part_curr = md->part_type; 3015 mmc_queue_resume(&md->queue); 3016 list_for_each_entry(part_md, &md->part, part) { 3017 mmc_queue_resume(&part_md->queue); 3018 } 3019 } 3020 return 0; 3021 } 3022 #endif 3023 3024 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume); 3025 3026 static struct mmc_driver mmc_driver = { 3027 .drv = { 3028 .name = "mmcblk", 3029 .pm = &mmc_blk_pm_ops, 3030 }, 3031 .probe = mmc_blk_probe, 3032 .remove = mmc_blk_remove, 3033 .shutdown = mmc_blk_shutdown, 3034 }; 3035 3036 static int __init mmc_blk_init(void) 3037 { 3038 int res; 3039 3040 res = bus_register(&mmc_rpmb_bus_type); 3041 if (res < 0) { 3042 pr_err("mmcblk: could not register RPMB bus type\n"); 3043 return res; 3044 } 3045 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb"); 3046 if (res < 0) { 3047 pr_err("mmcblk: failed to allocate rpmb chrdev region\n"); 3048 goto out_bus_unreg; 3049 } 3050 3051 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS) 3052 pr_info("mmcblk: using %d minors per device\n", perdev_minors); 3053 3054 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors); 3055 3056 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); 3057 if (res) 3058 goto out_chrdev_unreg; 3059 3060 res = mmc_register_driver(&mmc_driver); 3061 if (res) 3062 goto out_blkdev_unreg; 3063 3064 return 0; 3065 3066 out_blkdev_unreg: 3067 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); 3068 out_chrdev_unreg: 3069 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES); 3070 out_bus_unreg: 3071 bus_unregister(&mmc_rpmb_bus_type); 3072 return res; 3073 } 3074 3075 static void __exit mmc_blk_exit(void) 3076 { 3077 mmc_unregister_driver(&mmc_driver); 3078 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); 3079 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES); 3080 bus_unregister(&mmc_rpmb_bus_type); 3081 } 3082 3083 module_init(mmc_blk_init); 3084 module_exit(mmc_blk_exit); 3085 3086 MODULE_LICENSE("GPL"); 3087 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); 3088 3089