2 * Block driver for media (i.e., flash cards)
4 * Copyright 2002 Hewlett-Packard Company
5 * Copyright 2005-2008 Pierre Ossman
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.
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.
15 * Many thanks to Alessandro Rubini and Jonathan Corbet!
17 * Author: Andrew Christian
20 #include <linux/moduleparam.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
24 #include <linux/kernel.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>
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>
46 #include <linux/uaccess.h>
58 MODULE_ALIAS("mmc:block");
59 #ifdef MODULE_PARAM_PREFIX
60 #undef MODULE_PARAM_PREFIX
62 #define MODULE_PARAM_PREFIX "mmcblk."
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)
68 #define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
69 (rq_data_dir(req) == WRITE))
70 static DEFINE_MUTEX(block_mutex);
73 * The defaults come from config options but can be overriden by module
76 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
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.
83 static int max_devices;
85 #define MAX_DEVICES 256
87 static DEFINE_IDA(mmc_blk_ida);
90 * There is one mmc_blk_data per slot.
94 struct device *parent;
96 struct mmc_queue queue;
97 struct list_head part;
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 */
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)
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.
117 unsigned int part_curr;
118 struct device_attribute force_ro;
119 struct device_attribute power_ro_lock;
123 static DEFINE_MUTEX(open_lock);
125 module_param(perdev_minors, int, 0444);
126 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
128 static inline int mmc_blk_part_switch(struct mmc_card *card,
129 struct mmc_blk_data *md);
131 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
133 struct mmc_blk_data *md;
135 mutex_lock(&open_lock);
136 md = disk->private_data;
137 if (md && md->usage == 0)
141 mutex_unlock(&open_lock);
146 static inline int mmc_get_devidx(struct gendisk *disk)
148 int devidx = disk->first_minor / perdev_minors;
152 static void mmc_blk_put(struct mmc_blk_data *md)
154 mutex_lock(&open_lock);
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);
163 mutex_unlock(&open_lock);
166 static ssize_t power_ro_lock_show(struct device *dev,
167 struct device_attribute *attr, char *buf)
170 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
171 struct mmc_card *card = md->queue.card;
174 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
176 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
179 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
186 static ssize_t power_ro_lock_store(struct device *dev,
187 struct device_attribute *attr, const char *buf, size_t count)
190 struct mmc_blk_data *md, *part_md;
191 struct mmc_card *card;
192 struct mmc_queue *mq;
196 if (kstrtoul(buf, 0, &set))
202 md = mmc_blk_get(dev_to_disk(dev));
204 card = md->queue.card;
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;
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);
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);
228 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
232 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
234 ret = snprintf(buf, PAGE_SIZE, "%d\n",
235 get_disk_ro(dev_to_disk(dev)) ^
241 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
242 const char *buf, size_t count)
246 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
247 unsigned long set = simple_strtoul(buf, &end, 0);
253 set_disk_ro(dev_to_disk(dev), set || md->read_only);
260 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
262 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
265 mutex_lock(&block_mutex);
268 check_disk_change(bdev);
271 if ((mode & FMODE_WRITE) && md->read_only) {
276 mutex_unlock(&block_mutex);
281 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
283 struct mmc_blk_data *md = disk->private_data;
285 mutex_lock(&block_mutex);
287 mutex_unlock(&block_mutex);
291 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
293 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
299 struct mmc_blk_ioc_data {
300 struct mmc_ioc_cmd ic;
305 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
306 struct mmc_ioc_cmd __user *user)
308 struct mmc_blk_ioc_data *idata;
311 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
317 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
322 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
323 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
328 if (!idata->buf_bytes) {
333 idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
339 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
340 idata->ic.data_ptr, idata->buf_bytes)) {
355 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
356 struct mmc_blk_ioc_data *idata)
358 struct mmc_ioc_cmd *ic = &idata->ic;
360 if (copy_to_user(&(ic_ptr->response), ic->response,
361 sizeof(ic->response)))
364 if (!idata->ic.write_flag) {
365 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
366 idata->buf, idata->buf_bytes))
373 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
379 if (!status || !retries_max)
383 err = __mmc_send_status(card, status, 5);
387 if (!R1_STATUS(*status) &&
388 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
389 break; /* RPMB programming operation complete */
392 * Rechedule to give the MMC device a chance to continue
393 * processing the previous command without being polled too
396 usleep_range(1000, 5000);
397 } while (++retry_count < retries_max);
399 if (retry_count == retries_max)
405 static int ioctl_do_sanitize(struct mmc_card *card)
409 if (!mmc_can_sanitize(card)) {
410 pr_warn("%s: %s - SANITIZE is not supported\n",
411 mmc_hostname(card->host), __func__);
416 pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
417 mmc_hostname(card->host), __func__);
419 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
420 EXT_CSD_SANITIZE_START, 1,
421 MMC_SANITIZE_REQ_TIMEOUT);
424 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
425 mmc_hostname(card->host), __func__, err);
427 pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
433 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
434 struct mmc_blk_ioc_data *idata)
436 struct mmc_command cmd = {};
437 struct mmc_data data = {};
438 struct mmc_request mrq = {};
439 struct scatterlist sg;
441 bool is_rpmb = false;
444 if (!card || !md || !idata)
447 if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
450 cmd.opcode = idata->ic.opcode;
451 cmd.arg = idata->ic.arg;
452 cmd.flags = idata->ic.flags;
454 if (idata->buf_bytes) {
457 data.blksz = idata->ic.blksz;
458 data.blocks = idata->ic.blocks;
460 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
462 if (idata->ic.write_flag)
463 data.flags = MMC_DATA_WRITE;
465 data.flags = MMC_DATA_READ;
467 /* data.flags must already be set before doing this. */
468 mmc_set_data_timeout(&data, card);
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;
474 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
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
482 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
484 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
492 err = mmc_blk_part_switch(card, md);
496 if (idata->ic.is_acmd) {
497 err = mmc_app_cmd(card->host, card);
503 err = mmc_set_blockcount(card, data.blocks,
504 idata->ic.write_flag & (1 << 31));
509 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
510 (cmd.opcode == MMC_SWITCH)) {
511 err = ioctl_do_sanitize(card);
514 pr_err("%s: ioctl_do_sanitize() failed. err = %d",
520 mmc_wait_for_req(card->host, &mrq);
523 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
524 __func__, cmd.error);
528 dev_err(mmc_dev(card->host), "%s: data error %d\n",
529 __func__, data.error);
534 * According to the SD specs, some commands require a delay after
535 * issuing the command.
537 if (idata->ic.postsleep_min_us)
538 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
540 memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
544 * Ensure RPMB command has completed by polling CMD13
547 err = ioctl_rpmb_card_status_poll(card, &status, 5);
549 dev_err(mmc_dev(card->host),
550 "%s: Card Status=0x%08X, error %d\n",
551 __func__, status, err);
557 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
558 struct mmc_ioc_cmd __user *ic_ptr)
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;
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.
573 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
576 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
578 return PTR_ERR(idata);
580 md = mmc_blk_get(bdev->bd_disk);
586 card = md->queue.card;
593 * Dispatch the ioctl() into the block request queue.
596 req = blk_get_request(mq->queue,
597 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
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);
613 return ioc_err ? ioc_err : err;
616 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
617 struct mmc_ioc_multi_cmd __user *user)
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;
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.
633 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
636 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
637 sizeof(num_of_cmds)))
640 if (num_of_cmds > MMC_IOC_MAX_CMDS)
643 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
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]);
656 md = mmc_blk_get(bdev->bd_disk);
662 card = md->queue.card;
670 * Dispatch the ioctl()s into the block request queue.
673 req = blk_get_request(mq->queue,
674 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
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;
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]);
686 blk_put_request(req);
691 for (i = 0; i < num_of_cmds; i++) {
692 kfree(idata[i]->buf);
696 return ioc_err ? ioc_err : err;
699 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
700 unsigned int cmd, unsigned long arg)
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);
715 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
716 unsigned int cmd, unsigned long arg)
718 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
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,
729 .compat_ioctl = mmc_blk_compat_ioctl,
733 static int mmc_blk_part_switch_pre(struct mmc_card *card,
734 unsigned int part_type)
738 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
739 if (card->ext_csd.cmdq_en) {
740 ret = mmc_cmdq_disable(card);
744 mmc_retune_pause(card->host);
750 static int mmc_blk_part_switch_post(struct mmc_card *card,
751 unsigned int part_type)
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);
764 static inline int mmc_blk_part_switch(struct mmc_card *card,
765 struct mmc_blk_data *md)
768 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
770 if (main_md->part_curr == md->part_type)
773 if (mmc_card_mmc(card)) {
774 u8 part_config = card->ext_csd.part_config;
776 ret = mmc_blk_part_switch_pre(card, md->part_type);
780 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
781 part_config |= md->part_type;
783 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
784 EXT_CSD_PART_CONFIG, part_config,
785 card->ext_csd.part_time);
787 mmc_blk_part_switch_post(card, md->part_type);
791 card->ext_csd.part_config = part_config;
793 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
796 main_md->part_curr = md->part_type;
800 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
806 struct mmc_request mrq = {};
807 struct mmc_command cmd = {};
808 struct mmc_data data = {};
810 struct scatterlist sg;
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;
816 err = mmc_wait_for_cmd(card->host, &cmd, 0);
819 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
822 memset(&cmd, 0, sizeof(struct mmc_command));
824 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
826 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
830 data.flags = MMC_DATA_READ;
833 mmc_set_data_timeout(&data, card);
838 blocks = kmalloc(4, GFP_KERNEL);
842 sg_init_one(&sg, blocks, 4);
844 mmc_wait_for_req(card->host, &mrq);
846 result = ntohl(*blocks);
849 if (cmd.error || data.error)
852 *written_blocks = result;
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)
860 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
865 err = __mmc_send_status(card, &status, 5);
867 pr_err("%s: error %d requesting status\n",
868 req->rq_disk->disk_name, err);
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);
878 /* We may rely on the host hw to handle busy detection.*/
879 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
884 * Timeout if the device never becomes ready for data and never
885 * leaves the program state.
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__);
895 * Some cards mishandle the status bits,
896 * so make sure to check both the busy
897 * indication and the card state.
899 } while (!(status & R1_READY_FOR_DATA) ||
900 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
905 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
906 struct request *req, bool *gen_err, u32 *stop_status)
908 struct mmc_host *host = card->host;
909 struct mmc_command cmd = {};
911 bool use_r1b_resp = rq_data_dir(req) == WRITE;
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.
919 if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
920 use_r1b_resp = false;
922 cmd.opcode = MMC_STOP_TRANSMISSION;
924 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
925 cmd.busy_timeout = timeout_ms;
927 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
930 err = mmc_wait_for_cmd(host, &cmd, 5);
934 *stop_status = cmd.resp[0];
936 /* No need to check card status in case of READ. */
937 if (rq_data_dir(req) == READ)
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);
947 return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
950 #define ERR_NOMEDIUM 3
953 #define ERR_CONTINUE 0
955 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
956 bool status_valid, u32 status)
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",
967 pr_err("%s: %s sending %s command, card status %#x\n",
968 req->rq_disk->disk_name, "timed out", name, status);
970 /* If the status cmd initially failed, retry the r/w cmd */
972 pr_err("%s: status not valid, retrying timeout\n",
973 req->rq_disk->disk_name);
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.
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);
988 /* Otherwise abort the command */
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);
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.
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)
1020 bool prev_cmd_status_valid = true;
1021 u32 status, stop_status = 0;
1024 if (mmc_card_removed(card))
1025 return ERR_NOMEDIUM;
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.
1032 for (retry = 2; retry >= 0; retry--) {
1033 err = __mmc_send_status(card, &status, 0);
1037 /* Re-tune if needed */
1038 mmc_retune_recheck(card->host);
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");
1045 /* We couldn't get a response from the card. Give up. */
1047 /* Check if the card is removed */
1048 if (mmc_detect_card_removed(card->host))
1049 return ERR_NOMEDIUM;
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))
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);
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.)
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);
1079 pr_err("%s: error %d sending stop command\n",
1080 req->rq_disk->disk_name, err);
1082 * If the stop cmd also timed out, the card is probably
1083 * not present, so abort. Other errors are bad news too.
1088 if (stop_status & R1_CARD_ECC_FAILED)
1092 /* Check for set block count errors */
1094 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1095 prev_cmd_status_valid, status);
1097 /* Check for r/w command errors */
1099 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1100 prev_cmd_status_valid, status);
1103 if (!brq->stop.error)
1104 return ERR_CONTINUE;
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);
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.
1116 brq->stop.resp[0] = stop_status;
1117 brq->stop.error = 0;
1119 return ERR_CONTINUE;
1122 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1127 if (md->reset_done & type)
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);
1138 main_md->part_curr = main_md->part_type;
1139 part_err = mmc_blk_part_switch(host->card, md);
1142 * We have failed to get back into the correct
1143 * partition, so we need to abort the whole request.
1151 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1153 md->reset_done &= ~type;
1156 int mmc_access_rpmb(struct mmc_queue *mq)
1158 struct mmc_blk_data *md = mq->blkdata;
1160 * If this is a RPMB partition access, return ture
1162 if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
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
1173 static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1175 struct mmc_queue_req *mq_rq;
1176 struct mmc_card *card = mq->card;
1177 struct mmc_blk_data *md = mq->blkdata;
1181 mq_rq = req_to_mmc_queue_req(req);
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]);
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));
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);
1200 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1201 md->disk->disk_name, ret);
1203 card->ext_csd.boot_ro_lock |=
1204 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1207 pr_err("%s: unknown driver specific operation\n",
1208 md->disk->disk_name);
1212 mq_rq->drv_op_result = ret;
1213 blk_end_request_all(req, ret);
1216 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
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 blk_status_t status = BLK_STS_OK;
1224 if (!mmc_can_erase(card)) {
1225 status = BLK_STS_NOTSUPP;
1229 from = blk_rq_pos(req);
1230 nr = blk_rq_sectors(req);
1232 if (mmc_can_discard(card))
1233 arg = MMC_DISCARD_ARG;
1234 else if (mmc_can_trim(card))
1237 arg = MMC_ERASE_ARG;
1240 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1241 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1242 INAND_CMD38_ARG_EXT_CSD,
1243 arg == MMC_TRIM_ARG ?
1244 INAND_CMD38_ARG_TRIM :
1245 INAND_CMD38_ARG_ERASE,
1249 err = mmc_erase(card, from, nr, arg);
1250 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1252 status = BLK_STS_IOERR;
1254 mmc_blk_reset_success(md, type);
1256 blk_end_request(req, status, blk_rq_bytes(req));
1259 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1260 struct request *req)
1262 struct mmc_blk_data *md = mq->blkdata;
1263 struct mmc_card *card = md->queue.card;
1264 unsigned int from, nr, arg;
1265 int err = 0, type = MMC_BLK_SECDISCARD;
1266 blk_status_t status = BLK_STS_OK;
1268 if (!(mmc_can_secure_erase_trim(card))) {
1269 status = BLK_STS_NOTSUPP;
1273 from = blk_rq_pos(req);
1274 nr = blk_rq_sectors(req);
1276 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1277 arg = MMC_SECURE_TRIM1_ARG;
1279 arg = MMC_SECURE_ERASE_ARG;
1282 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1283 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1284 INAND_CMD38_ARG_EXT_CSD,
1285 arg == MMC_SECURE_TRIM1_ARG ?
1286 INAND_CMD38_ARG_SECTRIM1 :
1287 INAND_CMD38_ARG_SECERASE,
1293 err = mmc_erase(card, from, nr, arg);
1297 status = BLK_STS_IOERR;
1301 if (arg == MMC_SECURE_TRIM1_ARG) {
1302 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1303 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1304 INAND_CMD38_ARG_EXT_CSD,
1305 INAND_CMD38_ARG_SECTRIM2,
1311 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1315 status = BLK_STS_IOERR;
1321 if (err && !mmc_blk_reset(md, card->host, type))
1324 mmc_blk_reset_success(md, type);
1326 blk_end_request(req, status, blk_rq_bytes(req));
1329 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1331 struct mmc_blk_data *md = mq->blkdata;
1332 struct mmc_card *card = md->queue.card;
1335 ret = mmc_flush_cache(card);
1336 blk_end_request_all(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1340 * Reformat current write as a reliable write, supporting
1341 * both legacy and the enhanced reliable write MMC cards.
1342 * In each transfer we'll handle only as much as a single
1343 * reliable write can handle, thus finish the request in
1344 * partial completions.
1346 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1347 struct mmc_card *card,
1348 struct request *req)
1350 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1351 /* Legacy mode imposes restrictions on transfers. */
1352 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1353 brq->data.blocks = 1;
1355 if (brq->data.blocks > card->ext_csd.rel_sectors)
1356 brq->data.blocks = card->ext_csd.rel_sectors;
1357 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1358 brq->data.blocks = 1;
1362 #define CMD_ERRORS \
1363 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
1364 R1_ADDRESS_ERROR | /* Misaligned address */ \
1365 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1366 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1367 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1368 R1_CC_ERROR | /* Card controller error */ \
1369 R1_ERROR) /* General/unknown error */
1371 static bool mmc_blk_has_cmd_err(struct mmc_command *cmd)
1373 if (!cmd->error && cmd->resp[0] & CMD_ERRORS)
1379 static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
1380 struct mmc_async_req *areq)
1382 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1384 struct mmc_blk_request *brq = &mq_mrq->brq;
1385 struct request *req = mmc_queue_req_to_req(mq_mrq);
1386 int need_retune = card->host->need_retune;
1387 bool ecc_err = false;
1388 bool gen_err = false;
1391 * sbc.error indicates a problem with the set block count
1392 * command. No data will have been transferred.
1394 * cmd.error indicates a problem with the r/w command. No
1395 * data will have been transferred.
1397 * stop.error indicates a problem with the stop command. Data
1398 * may have been transferred, or may still be transferring.
1400 if (brq->sbc.error || brq->cmd.error || mmc_blk_has_cmd_err(&brq->stop) ||
1402 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1404 return MMC_BLK_RETRY;
1406 return MMC_BLK_ABORT;
1408 return MMC_BLK_NOMEDIUM;
1415 * Check for errors relating to the execution of the
1416 * initial command - such as address errors. No data
1417 * has been transferred.
1419 if (brq->cmd.resp[0] & CMD_ERRORS) {
1420 pr_err("%s: r/w command failed, status = %#x\n",
1421 req->rq_disk->disk_name, brq->cmd.resp[0]);
1422 return MMC_BLK_ABORT;
1426 * Everything else is either success, or a data error of some
1427 * kind. If it was a write, we may have transitioned to
1428 * program mode, which we have to wait for it to complete.
1430 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1433 /* Check stop command response */
1434 if (brq->stop.resp[0] & R1_ERROR) {
1435 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1436 req->rq_disk->disk_name, __func__,
1441 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1444 return MMC_BLK_CMD_ERR;
1447 /* if general error occurs, retry the write operation. */
1449 pr_warn("%s: retrying write for general error\n",
1450 req->rq_disk->disk_name);
1451 return MMC_BLK_RETRY;
1454 /* Some errors (ECC) are flagged on the next commmand, so check stop, too */
1455 if (brq->data.error || brq->stop.error) {
1456 if (need_retune && !brq->retune_retry_done) {
1457 pr_debug("%s: retrying because a re-tune was needed\n",
1458 req->rq_disk->disk_name);
1459 brq->retune_retry_done = 1;
1460 return MMC_BLK_RETRY;
1462 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1463 req->rq_disk->disk_name, brq->data.error ?: brq->stop.error,
1464 (unsigned)blk_rq_pos(req),
1465 (unsigned)blk_rq_sectors(req),
1466 brq->cmd.resp[0], brq->stop.resp[0]);
1468 if (rq_data_dir(req) == READ) {
1470 return MMC_BLK_ECC_ERR;
1471 return MMC_BLK_DATA_ERR;
1473 return MMC_BLK_CMD_ERR;
1477 if (!brq->data.bytes_xfered)
1478 return MMC_BLK_RETRY;
1480 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1481 return MMC_BLK_PARTIAL;
1483 return MMC_BLK_SUCCESS;
1486 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1487 int disable_multi, bool *do_rel_wr,
1490 struct mmc_blk_data *md = mq->blkdata;
1491 struct mmc_card *card = md->queue.card;
1492 struct mmc_blk_request *brq = &mqrq->brq;
1493 struct request *req = mmc_queue_req_to_req(mqrq);
1496 * Reliable writes are used to implement Forced Unit Access and
1497 * are supported only on MMCs.
1499 *do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1500 rq_data_dir(req) == WRITE &&
1501 (md->flags & MMC_BLK_REL_WR);
1503 memset(brq, 0, sizeof(struct mmc_blk_request));
1505 brq->mrq.data = &brq->data;
1507 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1510 if (rq_data_dir(req) == READ) {
1511 brq->data.flags = MMC_DATA_READ;
1512 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1514 brq->data.flags = MMC_DATA_WRITE;
1515 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1518 brq->data.blksz = 512;
1519 brq->data.blocks = blk_rq_sectors(req);
1522 * The block layer doesn't support all sector count
1523 * restrictions, so we need to be prepared for too big
1526 if (brq->data.blocks > card->host->max_blk_count)
1527 brq->data.blocks = card->host->max_blk_count;
1529 if (brq->data.blocks > 1) {
1531 * After a read error, we redo the request one sector
1532 * at a time in order to accurately determine which
1533 * sectors can be read successfully.
1536 brq->data.blocks = 1;
1539 * Some controllers have HW issues while operating
1540 * in multiple I/O mode
1542 if (card->host->ops->multi_io_quirk)
1543 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1544 (rq_data_dir(req) == READ) ?
1545 MMC_DATA_READ : MMC_DATA_WRITE,
1550 mmc_apply_rel_rw(brq, card, req);
1553 * Data tag is used only during writing meta data to speed
1554 * up write and any subsequent read of this meta data
1556 *do_data_tag = card->ext_csd.data_tag_unit_size &&
1557 (req->cmd_flags & REQ_META) &&
1558 (rq_data_dir(req) == WRITE) &&
1559 ((brq->data.blocks * brq->data.blksz) >=
1560 card->ext_csd.data_tag_unit_size);
1562 mmc_set_data_timeout(&brq->data, card);
1564 brq->data.sg = mqrq->sg;
1565 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1568 * Adjust the sg list so it is the same size as the
1571 if (brq->data.blocks != blk_rq_sectors(req)) {
1572 int i, data_size = brq->data.blocks << 9;
1573 struct scatterlist *sg;
1575 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1576 data_size -= sg->length;
1577 if (data_size <= 0) {
1578 sg->length += data_size;
1583 brq->data.sg_len = i;
1586 mqrq->areq.mrq = &brq->mrq;
1588 mmc_queue_bounce_pre(mqrq);
1591 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1592 struct mmc_card *card,
1594 struct mmc_queue *mq)
1596 u32 readcmd, writecmd;
1597 struct mmc_blk_request *brq = &mqrq->brq;
1598 struct request *req = mmc_queue_req_to_req(mqrq);
1599 struct mmc_blk_data *md = mq->blkdata;
1600 bool do_rel_wr, do_data_tag;
1602 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1604 brq->mrq.cmd = &brq->cmd;
1606 brq->cmd.arg = blk_rq_pos(req);
1607 if (!mmc_card_blockaddr(card))
1609 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1611 if (brq->data.blocks > 1 || do_rel_wr) {
1612 /* SPI multiblock writes terminate using a special
1613 * token, not a STOP_TRANSMISSION request.
1615 if (!mmc_host_is_spi(card->host) ||
1616 rq_data_dir(req) == READ)
1617 brq->mrq.stop = &brq->stop;
1618 readcmd = MMC_READ_MULTIPLE_BLOCK;
1619 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1621 brq->mrq.stop = NULL;
1622 readcmd = MMC_READ_SINGLE_BLOCK;
1623 writecmd = MMC_WRITE_BLOCK;
1625 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1628 * Pre-defined multi-block transfers are preferable to
1629 * open ended-ones (and necessary for reliable writes).
1630 * However, it is not sufficient to just send CMD23,
1631 * and avoid the final CMD12, as on an error condition
1632 * CMD12 (stop) needs to be sent anyway. This, coupled
1633 * with Auto-CMD23 enhancements provided by some
1634 * hosts, means that the complexity of dealing
1635 * with this is best left to the host. If CMD23 is
1636 * supported by card and host, we'll fill sbc in and let
1637 * the host deal with handling it correctly. This means
1638 * that for hosts that don't expose MMC_CAP_CMD23, no
1639 * change of behavior will be observed.
1641 * N.B: Some MMC cards experience perf degradation.
1642 * We'll avoid using CMD23-bounded multiblock writes for
1643 * these, while retaining features like reliable writes.
1645 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1646 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1648 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1649 brq->sbc.arg = brq->data.blocks |
1650 (do_rel_wr ? (1 << 31) : 0) |
1651 (do_data_tag ? (1 << 29) : 0);
1652 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1653 brq->mrq.sbc = &brq->sbc;
1656 mqrq->areq.err_check = mmc_blk_err_check;
1659 static bool mmc_blk_rw_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1660 struct mmc_blk_request *brq, struct request *req,
1661 bool old_req_pending)
1666 * If this is an SD card and we're writing, we can first
1667 * mark the known good sectors as ok.
1669 * If the card is not SD, we can still ok written sectors
1670 * as reported by the controller (which might be less than
1671 * the real number of written sectors, but never more).
1673 if (mmc_card_sd(card)) {
1677 err = mmc_sd_num_wr_blocks(card, &blocks);
1679 req_pending = old_req_pending;
1681 req_pending = blk_end_request(req, 0, blocks << 9);
1683 req_pending = blk_end_request(req, 0, brq->data.bytes_xfered);
1688 static void mmc_blk_rw_cmd_abort(struct mmc_queue *mq, struct mmc_card *card,
1689 struct request *req,
1690 struct mmc_queue_req *mqrq)
1692 if (mmc_card_removed(card))
1693 req->rq_flags |= RQF_QUIET;
1694 while (blk_end_request(req, BLK_STS_IOERR, blk_rq_cur_bytes(req)));
1699 * mmc_blk_rw_try_restart() - tries to restart the current async request
1700 * @mq: the queue with the card and host to restart
1701 * @req: a new request that want to be started after the current one
1703 static void mmc_blk_rw_try_restart(struct mmc_queue *mq, struct request *req,
1704 struct mmc_queue_req *mqrq)
1710 * If the card was removed, just cancel everything and return.
1712 if (mmc_card_removed(mq->card)) {
1713 req->rq_flags |= RQF_QUIET;
1714 blk_end_request_all(req, BLK_STS_IOERR);
1715 mq->qcnt--; /* FIXME: just set to 0? */
1718 /* Else proceed and try to restart the current async request */
1719 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1720 mmc_start_areq(mq->card->host, &mqrq->areq, NULL);
1723 static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
1725 struct mmc_blk_data *md = mq->blkdata;
1726 struct mmc_card *card = md->queue.card;
1727 struct mmc_blk_request *brq;
1728 int disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1729 enum mmc_blk_status status;
1730 struct mmc_queue_req *mqrq_cur = NULL;
1731 struct mmc_queue_req *mq_rq;
1732 struct request *old_req;
1733 struct mmc_async_req *new_areq;
1734 struct mmc_async_req *old_areq;
1735 bool req_pending = true;
1738 mqrq_cur = req_to_mmc_queue_req(new_req);
1748 * When 4KB native sector is enabled, only 8 blocks
1749 * multiple read or write is allowed
1751 if (mmc_large_sector(card) &&
1752 !IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
1753 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1754 new_req->rq_disk->disk_name);
1755 mmc_blk_rw_cmd_abort(mq, card, new_req, mqrq_cur);
1759 mmc_blk_rw_rq_prep(mqrq_cur, card, 0, mq);
1760 new_areq = &mqrq_cur->areq;
1764 old_areq = mmc_start_areq(card->host, new_areq, &status);
1767 * We have just put the first request into the pipeline
1768 * and there is nothing more to do until it is
1775 * An asynchronous request has been completed and we proceed
1776 * to handle the result of it.
1778 mq_rq = container_of(old_areq, struct mmc_queue_req, areq);
1780 old_req = mmc_queue_req_to_req(mq_rq);
1781 type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1782 mmc_queue_bounce_post(mq_rq);
1785 case MMC_BLK_SUCCESS:
1786 case MMC_BLK_PARTIAL:
1788 * A block was successfully transferred.
1790 mmc_blk_reset_success(md, type);
1792 req_pending = blk_end_request(old_req, BLK_STS_OK,
1793 brq->data.bytes_xfered);
1795 * If the blk_end_request function returns non-zero even
1796 * though all data has been transferred and no errors
1797 * were returned by the host controller, it's a bug.
1799 if (status == MMC_BLK_SUCCESS && req_pending) {
1800 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1801 __func__, blk_rq_bytes(old_req),
1802 brq->data.bytes_xfered);
1803 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1807 case MMC_BLK_CMD_ERR:
1808 req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
1809 if (mmc_blk_reset(md, card->host, type)) {
1811 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1814 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1819 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1824 retune_retry_done = brq->retune_retry_done;
1829 if (!mmc_blk_reset(md, card->host, type))
1831 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1832 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1834 case MMC_BLK_DATA_ERR: {
1837 err = mmc_blk_reset(md, card->host, type);
1840 if (err == -ENODEV) {
1841 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1842 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1847 case MMC_BLK_ECC_ERR:
1848 if (brq->data.blocks > 1) {
1849 /* Redo read one sector at a time */
1850 pr_warn("%s: retrying using single block read\n",
1851 old_req->rq_disk->disk_name);
1856 * After an error, we redo I/O one sector at a
1857 * time, so we only reach here after trying to
1858 * read a single sector.
1860 req_pending = blk_end_request(old_req, BLK_STS_IOERR,
1864 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1868 case MMC_BLK_NOMEDIUM:
1869 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1870 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1873 pr_err("%s: Unhandled return value (%d)",
1874 old_req->rq_disk->disk_name, status);
1875 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1876 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1882 * In case of a incomplete request
1883 * prepare it again and resend.
1885 mmc_blk_rw_rq_prep(mq_rq, card,
1887 mmc_start_areq(card->host,
1888 &mq_rq->areq, NULL);
1889 mq_rq->brq.retune_retry_done = retune_retry_done;
1891 } while (req_pending);
1896 void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1899 struct mmc_blk_data *md = mq->blkdata;
1900 struct mmc_card *card = md->queue.card;
1902 if (req && !mq->qcnt)
1903 /* claim host only for the first request */
1906 ret = mmc_blk_part_switch(card, md);
1909 blk_end_request_all(req, BLK_STS_IOERR);
1915 switch (req_op(req)) {
1917 case REQ_OP_DRV_OUT:
1919 * Complete ongoing async transfer before issuing
1923 mmc_blk_issue_rw_rq(mq, NULL);
1924 mmc_blk_issue_drv_op(mq, req);
1926 case REQ_OP_DISCARD:
1928 * Complete ongoing async transfer before issuing
1932 mmc_blk_issue_rw_rq(mq, NULL);
1933 mmc_blk_issue_discard_rq(mq, req);
1935 case REQ_OP_SECURE_ERASE:
1937 * Complete ongoing async transfer before issuing
1941 mmc_blk_issue_rw_rq(mq, NULL);
1942 mmc_blk_issue_secdiscard_rq(mq, req);
1946 * Complete ongoing async transfer before issuing
1950 mmc_blk_issue_rw_rq(mq, NULL);
1951 mmc_blk_issue_flush(mq, req);
1954 /* Normal request, just issue it */
1955 mmc_blk_issue_rw_rq(mq, req);
1956 card->host->context_info.is_waiting_last_req = false;
1960 /* No request, flushing the pipeline with NULL */
1961 mmc_blk_issue_rw_rq(mq, NULL);
1962 card->host->context_info.is_waiting_last_req = false;
1970 static inline int mmc_blk_readonly(struct mmc_card *card)
1972 return mmc_card_readonly(card) ||
1973 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1976 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1977 struct device *parent,
1980 const char *subname,
1983 struct mmc_blk_data *md;
1986 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
1988 return ERR_PTR(devidx);
1990 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1996 md->area_type = area_type;
1999 * Set the read-only status based on the supported commands
2000 * and the write protect switch.
2002 md->read_only = mmc_blk_readonly(card);
2004 md->disk = alloc_disk(perdev_minors);
2005 if (md->disk == NULL) {
2010 spin_lock_init(&md->lock);
2011 INIT_LIST_HEAD(&md->part);
2014 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2018 md->queue.blkdata = md;
2020 md->disk->major = MMC_BLOCK_MAJOR;
2021 md->disk->first_minor = devidx * perdev_minors;
2022 md->disk->fops = &mmc_bdops;
2023 md->disk->private_data = md;
2024 md->disk->queue = md->queue.queue;
2025 md->parent = parent;
2026 set_disk_ro(md->disk, md->read_only || default_ro);
2027 md->disk->flags = GENHD_FL_EXT_DEVT;
2028 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2029 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2032 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2034 * - be set for removable media with permanent block devices
2035 * - be unset for removable block devices with permanent media
2037 * Since MMC block devices clearly fall under the second
2038 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2039 * should use the block device creation/destruction hotplug
2040 * messages to tell when the card is present.
2043 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2044 "mmcblk%u%s", card->host->index, subname ? subname : "");
2046 if (mmc_card_mmc(card))
2047 blk_queue_logical_block_size(md->queue.queue,
2048 card->ext_csd.data_sector_size);
2050 blk_queue_logical_block_size(md->queue.queue, 512);
2052 set_capacity(md->disk, size);
2054 if (mmc_host_cmd23(card->host)) {
2055 if ((mmc_card_mmc(card) &&
2056 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2057 (mmc_card_sd(card) &&
2058 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2059 md->flags |= MMC_BLK_CMD23;
2062 if (mmc_card_mmc(card) &&
2063 md->flags & MMC_BLK_CMD23 &&
2064 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2065 card->ext_csd.rel_sectors)) {
2066 md->flags |= MMC_BLK_REL_WR;
2067 blk_queue_write_cache(md->queue.queue, true, true);
2077 ida_simple_remove(&mmc_blk_ida, devidx);
2078 return ERR_PTR(ret);
2081 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2085 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2087 * The EXT_CSD sector count is in number or 512 byte
2090 size = card->ext_csd.sectors;
2093 * The CSD capacity field is in units of read_blkbits.
2094 * set_capacity takes units of 512 bytes.
2096 size = (typeof(sector_t))card->csd.capacity
2097 << (card->csd.read_blkbits - 9);
2100 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2101 MMC_BLK_DATA_AREA_MAIN);
2104 static int mmc_blk_alloc_part(struct mmc_card *card,
2105 struct mmc_blk_data *md,
2106 unsigned int part_type,
2109 const char *subname,
2113 struct mmc_blk_data *part_md;
2115 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2116 subname, area_type);
2117 if (IS_ERR(part_md))
2118 return PTR_ERR(part_md);
2119 part_md->part_type = part_type;
2120 list_add(&part_md->part, &md->part);
2122 string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2123 cap_str, sizeof(cap_str));
2124 pr_info("%s: %s %s partition %u %s\n",
2125 part_md->disk->disk_name, mmc_card_id(card),
2126 mmc_card_name(card), part_md->part_type, cap_str);
2130 /* MMC Physical partitions consist of two boot partitions and
2131 * up to four general purpose partitions.
2132 * For each partition enabled in EXT_CSD a block device will be allocatedi
2133 * to provide access to the partition.
2136 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2140 if (!mmc_card_mmc(card))
2143 for (idx = 0; idx < card->nr_parts; idx++) {
2144 if (card->part[idx].size) {
2145 ret = mmc_blk_alloc_part(card, md,
2146 card->part[idx].part_cfg,
2147 card->part[idx].size >> 9,
2148 card->part[idx].force_ro,
2149 card->part[idx].name,
2150 card->part[idx].area_type);
2159 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2161 struct mmc_card *card;
2165 * Flush remaining requests and free queues. It
2166 * is freeing the queue that stops new requests
2167 * from being accepted.
2169 card = md->queue.card;
2170 mmc_cleanup_queue(&md->queue);
2171 if (md->disk->flags & GENHD_FL_UP) {
2172 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2173 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2174 card->ext_csd.boot_ro_lockable)
2175 device_remove_file(disk_to_dev(md->disk),
2176 &md->power_ro_lock);
2178 del_gendisk(md->disk);
2184 static void mmc_blk_remove_parts(struct mmc_card *card,
2185 struct mmc_blk_data *md)
2187 struct list_head *pos, *q;
2188 struct mmc_blk_data *part_md;
2190 list_for_each_safe(pos, q, &md->part) {
2191 part_md = list_entry(pos, struct mmc_blk_data, part);
2193 mmc_blk_remove_req(part_md);
2197 static int mmc_add_disk(struct mmc_blk_data *md)
2200 struct mmc_card *card = md->queue.card;
2202 device_add_disk(md->parent, md->disk);
2203 md->force_ro.show = force_ro_show;
2204 md->force_ro.store = force_ro_store;
2205 sysfs_attr_init(&md->force_ro.attr);
2206 md->force_ro.attr.name = "force_ro";
2207 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2208 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2212 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2213 card->ext_csd.boot_ro_lockable) {
2216 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2219 mode = S_IRUGO | S_IWUSR;
2221 md->power_ro_lock.show = power_ro_lock_show;
2222 md->power_ro_lock.store = power_ro_lock_store;
2223 sysfs_attr_init(&md->power_ro_lock.attr);
2224 md->power_ro_lock.attr.mode = mode;
2225 md->power_ro_lock.attr.name =
2226 "ro_lock_until_next_power_on";
2227 ret = device_create_file(disk_to_dev(md->disk),
2228 &md->power_ro_lock);
2230 goto power_ro_lock_fail;
2235 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2237 del_gendisk(md->disk);
2242 static int mmc_blk_probe(struct mmc_card *card)
2244 struct mmc_blk_data *md, *part_md;
2248 * Check that the card supports the command class(es) we need.
2250 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2253 mmc_fixup_device(card, mmc_blk_fixups);
2255 md = mmc_blk_alloc(card);
2259 string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2260 cap_str, sizeof(cap_str));
2261 pr_info("%s: %s %s %s %s\n",
2262 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2263 cap_str, md->read_only ? "(ro)" : "");
2265 if (mmc_blk_alloc_parts(card, md))
2268 dev_set_drvdata(&card->dev, md);
2270 if (mmc_add_disk(md))
2273 list_for_each_entry(part_md, &md->part, part) {
2274 if (mmc_add_disk(part_md))
2278 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2279 pm_runtime_use_autosuspend(&card->dev);
2282 * Don't enable runtime PM for SD-combo cards here. Leave that
2283 * decision to be taken during the SDIO init sequence instead.
2285 if (card->type != MMC_TYPE_SD_COMBO) {
2286 pm_runtime_set_active(&card->dev);
2287 pm_runtime_enable(&card->dev);
2293 mmc_blk_remove_parts(card, md);
2294 mmc_blk_remove_req(md);
2298 static void mmc_blk_remove(struct mmc_card *card)
2300 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2302 mmc_blk_remove_parts(card, md);
2303 pm_runtime_get_sync(&card->dev);
2304 mmc_claim_host(card->host);
2305 mmc_blk_part_switch(card, md);
2306 mmc_release_host(card->host);
2307 if (card->type != MMC_TYPE_SD_COMBO)
2308 pm_runtime_disable(&card->dev);
2309 pm_runtime_put_noidle(&card->dev);
2310 mmc_blk_remove_req(md);
2311 dev_set_drvdata(&card->dev, NULL);
2314 static int _mmc_blk_suspend(struct mmc_card *card)
2316 struct mmc_blk_data *part_md;
2317 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2320 mmc_queue_suspend(&md->queue);
2321 list_for_each_entry(part_md, &md->part, part) {
2322 mmc_queue_suspend(&part_md->queue);
2328 static void mmc_blk_shutdown(struct mmc_card *card)
2330 _mmc_blk_suspend(card);
2333 #ifdef CONFIG_PM_SLEEP
2334 static int mmc_blk_suspend(struct device *dev)
2336 struct mmc_card *card = mmc_dev_to_card(dev);
2338 return _mmc_blk_suspend(card);
2341 static int mmc_blk_resume(struct device *dev)
2343 struct mmc_blk_data *part_md;
2344 struct mmc_blk_data *md = dev_get_drvdata(dev);
2348 * Resume involves the card going into idle state,
2349 * so current partition is always the main one.
2351 md->part_curr = md->part_type;
2352 mmc_queue_resume(&md->queue);
2353 list_for_each_entry(part_md, &md->part, part) {
2354 mmc_queue_resume(&part_md->queue);
2361 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2363 static struct mmc_driver mmc_driver = {
2366 .pm = &mmc_blk_pm_ops,
2368 .probe = mmc_blk_probe,
2369 .remove = mmc_blk_remove,
2370 .shutdown = mmc_blk_shutdown,
2373 static int __init mmc_blk_init(void)
2377 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2378 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2380 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2382 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2386 res = mmc_register_driver(&mmc_driver);
2392 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2397 static void __exit mmc_blk_exit(void)
2399 mmc_unregister_driver(&mmc_driver);
2400 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2403 module_init(mmc_blk_init);
2404 module_exit(mmc_blk_exit);
2406 MODULE_LICENSE("GPL");
2407 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");