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/cdev.h>
32 #include <linux/mutex.h>
33 #include <linux/scatterlist.h>
34 #include <linux/string_helpers.h>
35 #include <linux/delay.h>
36 #include <linux/capability.h>
37 #include <linux/compat.h>
38 #include <linux/pm_runtime.h>
39 #include <linux/idr.h>
40 #include <linux/debugfs.h>
42 #include <linux/mmc/ioctl.h>
43 #include <linux/mmc/card.h>
44 #include <linux/mmc/host.h>
45 #include <linux/mmc/mmc.h>
46 #include <linux/mmc/sd.h>
48 #include <linux/uaccess.h>
60 MODULE_ALIAS("mmc:block");
61 #ifdef MODULE_PARAM_PREFIX
62 #undef MODULE_PARAM_PREFIX
64 #define MODULE_PARAM_PREFIX "mmcblk."
67 * Set a 10 second timeout for polling write request busy state. Note, mmc core
68 * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
69 * second software timer to timeout the whole request, so 10 seconds should be
72 #define MMC_BLK_TIMEOUT_MS (10 * 1000)
73 #define MMC_SANITIZE_REQ_TIMEOUT 240000
74 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
75 #define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
77 #define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
78 (rq_data_dir(req) == WRITE))
79 static DEFINE_MUTEX(block_mutex);
82 * The defaults come from config options but can be overriden by module
85 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
88 * We've only got one major, so number of mmcblk devices is
89 * limited to (1 << 20) / number of minors per device. It is also
90 * limited by the MAX_DEVICES below.
92 static int max_devices;
94 #define MAX_DEVICES 256
96 static DEFINE_IDA(mmc_blk_ida);
97 static DEFINE_IDA(mmc_rpmb_ida);
100 * There is one mmc_blk_data per slot.
102 struct mmc_blk_data {
103 struct device *parent;
104 struct gendisk *disk;
105 struct mmc_queue queue;
106 struct list_head part;
107 struct list_head rpmbs;
110 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
111 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
114 unsigned int read_only;
115 unsigned int part_type;
116 unsigned int reset_done;
117 #define MMC_BLK_READ BIT(0)
118 #define MMC_BLK_WRITE BIT(1)
119 #define MMC_BLK_DISCARD BIT(2)
120 #define MMC_BLK_SECDISCARD BIT(3)
121 #define MMC_BLK_CQE_RECOVERY BIT(4)
124 * Only set in main mmc_blk_data associated
125 * with mmc_card with dev_set_drvdata, and keeps
126 * track of the current selected device partition.
128 unsigned int part_curr;
129 struct device_attribute force_ro;
130 struct device_attribute power_ro_lock;
133 /* debugfs files (only in main mmc_blk_data) */
134 struct dentry *status_dentry;
135 struct dentry *ext_csd_dentry;
138 /* Device type for RPMB character devices */
139 static dev_t mmc_rpmb_devt;
141 /* Bus type for RPMB character devices */
142 static struct bus_type mmc_rpmb_bus_type = {
147 * struct mmc_rpmb_data - special RPMB device type for these areas
148 * @dev: the device for the RPMB area
149 * @chrdev: character device for the RPMB area
150 * @id: unique device ID number
151 * @part_index: partition index (0 on first)
152 * @md: parent MMC block device
153 * @node: list item, so we can put this device on a list
155 struct mmc_rpmb_data {
159 unsigned int part_index;
160 struct mmc_blk_data *md;
161 struct list_head node;
164 static DEFINE_MUTEX(open_lock);
166 module_param(perdev_minors, int, 0444);
167 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
169 static inline int mmc_blk_part_switch(struct mmc_card *card,
170 unsigned int part_type);
172 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
174 struct mmc_blk_data *md;
176 mutex_lock(&open_lock);
177 md = disk->private_data;
178 if (md && md->usage == 0)
182 mutex_unlock(&open_lock);
187 static inline int mmc_get_devidx(struct gendisk *disk)
189 int devidx = disk->first_minor / perdev_minors;
193 static void mmc_blk_put(struct mmc_blk_data *md)
195 mutex_lock(&open_lock);
197 if (md->usage == 0) {
198 int devidx = mmc_get_devidx(md->disk);
199 blk_put_queue(md->queue.queue);
200 ida_simple_remove(&mmc_blk_ida, devidx);
204 mutex_unlock(&open_lock);
207 static ssize_t power_ro_lock_show(struct device *dev,
208 struct device_attribute *attr, char *buf)
211 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
212 struct mmc_card *card = md->queue.card;
215 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
217 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
220 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
227 static ssize_t power_ro_lock_store(struct device *dev,
228 struct device_attribute *attr, const char *buf, size_t count)
231 struct mmc_blk_data *md, *part_md;
232 struct mmc_queue *mq;
236 if (kstrtoul(buf, 0, &set))
242 md = mmc_blk_get(dev_to_disk(dev));
245 /* Dispatch locking to the block layer */
246 req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, 0);
248 count = PTR_ERR(req);
251 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
252 blk_execute_rq(mq->queue, NULL, req, 0);
253 ret = req_to_mmc_queue_req(req)->drv_op_result;
254 blk_put_request(req);
257 pr_info("%s: Locking boot partition ro until next power on\n",
258 md->disk->disk_name);
259 set_disk_ro(md->disk, 1);
261 list_for_each_entry(part_md, &md->part, part)
262 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
263 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
264 set_disk_ro(part_md->disk, 1);
272 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
276 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
278 ret = snprintf(buf, PAGE_SIZE, "%d\n",
279 get_disk_ro(dev_to_disk(dev)) ^
285 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t count)
290 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
291 unsigned long set = simple_strtoul(buf, &end, 0);
297 set_disk_ro(dev_to_disk(dev), set || md->read_only);
304 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
306 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
309 mutex_lock(&block_mutex);
312 check_disk_change(bdev);
315 if ((mode & FMODE_WRITE) && md->read_only) {
320 mutex_unlock(&block_mutex);
325 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
327 struct mmc_blk_data *md = disk->private_data;
329 mutex_lock(&block_mutex);
331 mutex_unlock(&block_mutex);
335 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
337 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
343 struct mmc_blk_ioc_data {
344 struct mmc_ioc_cmd ic;
347 struct mmc_rpmb_data *rpmb;
350 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
351 struct mmc_ioc_cmd __user *user)
353 struct mmc_blk_ioc_data *idata;
356 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
362 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
367 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
368 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
373 if (!idata->buf_bytes) {
378 idata->buf = memdup_user((void __user *)(unsigned long)
379 idata->ic.data_ptr, idata->buf_bytes);
380 if (IS_ERR(idata->buf)) {
381 err = PTR_ERR(idata->buf);
393 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
394 struct mmc_blk_ioc_data *idata)
396 struct mmc_ioc_cmd *ic = &idata->ic;
398 if (copy_to_user(&(ic_ptr->response), ic->response,
399 sizeof(ic->response)))
402 if (!idata->ic.write_flag) {
403 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
404 idata->buf, idata->buf_bytes))
411 static int ioctl_do_sanitize(struct mmc_card *card)
415 if (!mmc_can_sanitize(card)) {
416 pr_warn("%s: %s - SANITIZE is not supported\n",
417 mmc_hostname(card->host), __func__);
422 pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
423 mmc_hostname(card->host), __func__);
425 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
426 EXT_CSD_SANITIZE_START, 1,
427 MMC_SANITIZE_REQ_TIMEOUT);
430 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
431 mmc_hostname(card->host), __func__, err);
433 pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
439 static inline bool mmc_blk_in_tran_state(u32 status)
442 * Some cards mishandle the status bits, so make sure to check both the
443 * busy indication and the card state.
445 return status & R1_READY_FOR_DATA &&
446 (R1_CURRENT_STATE(status) == R1_STATE_TRAN);
449 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
452 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
457 bool done = time_after(jiffies, timeout);
459 err = __mmc_send_status(card, &status, 5);
461 dev_err(mmc_dev(card->host),
462 "error %d requesting status\n", err);
466 /* Accumulate any response error bits seen */
468 *resp_errs |= status;
471 * Timeout if the device never becomes ready for data and never
472 * leaves the program state.
475 dev_err(mmc_dev(card->host),
476 "Card stuck in wrong state! %s status: %#x\n",
482 * Some cards mishandle the status bits,
483 * so make sure to check both the busy
484 * indication and the card state.
486 } while (!mmc_blk_in_tran_state(status));
491 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
492 struct mmc_blk_ioc_data *idata)
494 struct mmc_command cmd = {}, sbc = {};
495 struct mmc_data data = {};
496 struct mmc_request mrq = {};
497 struct scatterlist sg;
499 unsigned int target_part;
501 if (!card || !md || !idata)
505 * The RPMB accesses comes in from the character device, so we
506 * need to target these explicitly. Else we just target the
507 * partition type for the block device the ioctl() was issued
511 /* Support multiple RPMB partitions */
512 target_part = idata->rpmb->part_index;
513 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
515 target_part = md->part_type;
518 cmd.opcode = idata->ic.opcode;
519 cmd.arg = idata->ic.arg;
520 cmd.flags = idata->ic.flags;
522 if (idata->buf_bytes) {
525 data.blksz = idata->ic.blksz;
526 data.blocks = idata->ic.blocks;
528 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
530 if (idata->ic.write_flag)
531 data.flags = MMC_DATA_WRITE;
533 data.flags = MMC_DATA_READ;
535 /* data.flags must already be set before doing this. */
536 mmc_set_data_timeout(&data, card);
538 /* Allow overriding the timeout_ns for empirical tuning. */
539 if (idata->ic.data_timeout_ns)
540 data.timeout_ns = idata->ic.data_timeout_ns;
542 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
544 * Pretend this is a data transfer and rely on the
545 * host driver to compute timeout. When all host
546 * drivers support cmd.cmd_timeout for R1B, this
550 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
552 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
560 err = mmc_blk_part_switch(card, target_part);
564 if (idata->ic.is_acmd) {
565 err = mmc_app_cmd(card->host, card);
571 sbc.opcode = MMC_SET_BLOCK_COUNT;
573 * We don't do any blockcount validation because the max size
574 * may be increased by a future standard. We just copy the
575 * 'Reliable Write' bit here.
577 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
578 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
582 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
583 (cmd.opcode == MMC_SWITCH)) {
584 err = ioctl_do_sanitize(card);
587 pr_err("%s: ioctl_do_sanitize() failed. err = %d",
593 mmc_wait_for_req(card->host, &mrq);
594 memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
597 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
598 __func__, cmd.error);
602 dev_err(mmc_dev(card->host), "%s: data error %d\n",
603 __func__, data.error);
608 * Make sure the cache of the PARTITION_CONFIG register and
609 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
610 * changed it successfully.
612 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
613 (cmd.opcode == MMC_SWITCH)) {
614 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
615 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
618 * Update cache so the next mmc_blk_part_switch call operates
619 * on up-to-date data.
621 card->ext_csd.part_config = value;
622 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
626 * Make sure to update CACHE_CTRL in case it was changed. The cache
627 * will get turned back on if the card is re-initialized, e.g.
628 * suspend/resume or hw reset in recovery.
630 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
631 (cmd.opcode == MMC_SWITCH)) {
632 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
634 card->ext_csd.cache_ctrl = value;
638 * According to the SD specs, some commands require a delay after
639 * issuing the command.
641 if (idata->ic.postsleep_min_us)
642 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
644 if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
646 * Ensure RPMB/R1B command has completed by polling CMD13
649 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL);
655 static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
656 struct mmc_ioc_cmd __user *ic_ptr,
657 struct mmc_rpmb_data *rpmb)
659 struct mmc_blk_ioc_data *idata;
660 struct mmc_blk_ioc_data *idatas[1];
661 struct mmc_queue *mq;
662 struct mmc_card *card;
663 int err = 0, ioc_err = 0;
666 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
668 return PTR_ERR(idata);
669 /* This will be NULL on non-RPMB ioctl():s */
672 card = md->queue.card;
679 * Dispatch the ioctl() into the block request queue.
682 req = blk_get_request(mq->queue,
683 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
689 req_to_mmc_queue_req(req)->drv_op =
690 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
691 req_to_mmc_queue_req(req)->drv_op_data = idatas;
692 req_to_mmc_queue_req(req)->ioc_count = 1;
693 blk_execute_rq(mq->queue, NULL, req, 0);
694 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
695 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
696 blk_put_request(req);
701 return ioc_err ? ioc_err : err;
704 static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
705 struct mmc_ioc_multi_cmd __user *user,
706 struct mmc_rpmb_data *rpmb)
708 struct mmc_blk_ioc_data **idata = NULL;
709 struct mmc_ioc_cmd __user *cmds = user->cmds;
710 struct mmc_card *card;
711 struct mmc_queue *mq;
712 int i, err = 0, ioc_err = 0;
716 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
717 sizeof(num_of_cmds)))
723 if (num_of_cmds > MMC_IOC_MAX_CMDS)
726 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
730 for (i = 0; i < num_of_cmds; i++) {
731 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
732 if (IS_ERR(idata[i])) {
733 err = PTR_ERR(idata[i]);
737 /* This will be NULL on non-RPMB ioctl():s */
738 idata[i]->rpmb = rpmb;
741 card = md->queue.card;
749 * Dispatch the ioctl()s into the block request queue.
752 req = blk_get_request(mq->queue,
753 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
758 req_to_mmc_queue_req(req)->drv_op =
759 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
760 req_to_mmc_queue_req(req)->drv_op_data = idata;
761 req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
762 blk_execute_rq(mq->queue, NULL, req, 0);
763 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
765 /* copy to user if data and response */
766 for (i = 0; i < num_of_cmds && !err; i++)
767 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
769 blk_put_request(req);
772 for (i = 0; i < num_of_cmds; i++) {
773 kfree(idata[i]->buf);
777 return ioc_err ? ioc_err : err;
780 static int mmc_blk_check_blkdev(struct block_device *bdev)
783 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
784 * whole block device, not on a partition. This prevents overspray
785 * between sibling partitions.
787 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
792 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
793 unsigned int cmd, unsigned long arg)
795 struct mmc_blk_data *md;
800 ret = mmc_blk_check_blkdev(bdev);
803 md = mmc_blk_get(bdev->bd_disk);
806 ret = mmc_blk_ioctl_cmd(md,
807 (struct mmc_ioc_cmd __user *)arg,
811 case MMC_IOC_MULTI_CMD:
812 ret = mmc_blk_check_blkdev(bdev);
815 md = mmc_blk_get(bdev->bd_disk);
818 ret = mmc_blk_ioctl_multi_cmd(md,
819 (struct mmc_ioc_multi_cmd __user *)arg,
829 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
830 unsigned int cmd, unsigned long arg)
832 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
836 static const struct block_device_operations mmc_bdops = {
837 .open = mmc_blk_open,
838 .release = mmc_blk_release,
839 .getgeo = mmc_blk_getgeo,
840 .owner = THIS_MODULE,
841 .ioctl = mmc_blk_ioctl,
843 .compat_ioctl = mmc_blk_compat_ioctl,
847 static int mmc_blk_part_switch_pre(struct mmc_card *card,
848 unsigned int part_type)
852 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
853 if (card->ext_csd.cmdq_en) {
854 ret = mmc_cmdq_disable(card);
858 mmc_retune_pause(card->host);
864 static int mmc_blk_part_switch_post(struct mmc_card *card,
865 unsigned int part_type)
869 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
870 mmc_retune_unpause(card->host);
871 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
872 ret = mmc_cmdq_enable(card);
878 static inline int mmc_blk_part_switch(struct mmc_card *card,
879 unsigned int part_type)
882 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
884 if (main_md->part_curr == part_type)
887 if (mmc_card_mmc(card)) {
888 u8 part_config = card->ext_csd.part_config;
890 ret = mmc_blk_part_switch_pre(card, part_type);
894 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
895 part_config |= part_type;
897 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
898 EXT_CSD_PART_CONFIG, part_config,
899 card->ext_csd.part_time);
901 mmc_blk_part_switch_post(card, part_type);
905 card->ext_csd.part_config = part_config;
907 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
910 main_md->part_curr = part_type;
914 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
920 struct mmc_request mrq = {};
921 struct mmc_command cmd = {};
922 struct mmc_data data = {};
924 struct scatterlist sg;
926 cmd.opcode = MMC_APP_CMD;
927 cmd.arg = card->rca << 16;
928 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
930 err = mmc_wait_for_cmd(card->host, &cmd, 0);
933 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
936 memset(&cmd, 0, sizeof(struct mmc_command));
938 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
940 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
944 data.flags = MMC_DATA_READ;
947 mmc_set_data_timeout(&data, card);
952 blocks = kmalloc(4, GFP_KERNEL);
956 sg_init_one(&sg, blocks, 4);
958 mmc_wait_for_req(card->host, &mrq);
960 result = ntohl(*blocks);
963 if (cmd.error || data.error)
966 *written_blocks = result;
971 static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
973 if (host->actual_clock)
974 return host->actual_clock / 1000;
976 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
978 return host->ios.clock / 2000;
980 /* How can there be no clock */
982 return 100; /* 100 kHz is minimum possible value */
985 static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
986 struct mmc_data *data)
988 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
991 if (data->timeout_clks) {
992 khz = mmc_blk_clock_khz(host);
993 ms += DIV_ROUND_UP(data->timeout_clks, khz);
999 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1004 if (md->reset_done & type)
1007 md->reset_done |= type;
1008 err = mmc_hw_reset(host);
1009 /* Ensure we switch back to the correct partition */
1010 if (err != -EOPNOTSUPP) {
1011 struct mmc_blk_data *main_md =
1012 dev_get_drvdata(&host->card->dev);
1015 main_md->part_curr = main_md->part_type;
1016 part_err = mmc_blk_part_switch(host->card, md->part_type);
1019 * We have failed to get back into the correct
1020 * partition, so we need to abort the whole request.
1028 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1030 md->reset_done &= ~type;
1034 * The non-block commands come back from the block layer after it queued it and
1035 * processed it with all other requests and then they get issued in this
1038 static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1040 struct mmc_queue_req *mq_rq;
1041 struct mmc_card *card = mq->card;
1042 struct mmc_blk_data *md = mq->blkdata;
1043 struct mmc_blk_ioc_data **idata;
1050 mq_rq = req_to_mmc_queue_req(req);
1051 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
1053 switch (mq_rq->drv_op) {
1054 case MMC_DRV_OP_IOCTL:
1055 if (card->ext_csd.cmdq_en) {
1056 ret = mmc_cmdq_disable(card);
1061 case MMC_DRV_OP_IOCTL_RPMB:
1062 idata = mq_rq->drv_op_data;
1063 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1064 ret = __mmc_blk_ioctl_cmd(card, md, idata[i]);
1068 /* Always switch back to main area after RPMB access */
1070 mmc_blk_part_switch(card, 0);
1071 else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
1072 mmc_cmdq_enable(card);
1074 case MMC_DRV_OP_BOOT_WP:
1075 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1076 card->ext_csd.boot_ro_lock |
1077 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1078 card->ext_csd.part_time);
1080 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1081 md->disk->disk_name, ret);
1083 card->ext_csd.boot_ro_lock |=
1084 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1086 case MMC_DRV_OP_GET_CARD_STATUS:
1087 ret = mmc_send_status(card, &status);
1091 case MMC_DRV_OP_GET_EXT_CSD:
1092 ext_csd = mq_rq->drv_op_data;
1093 ret = mmc_get_ext_csd(card, ext_csd);
1096 pr_err("%s: unknown driver specific operation\n",
1097 md->disk->disk_name);
1101 mq_rq->drv_op_result = ret;
1102 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1105 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1107 struct mmc_blk_data *md = mq->blkdata;
1108 struct mmc_card *card = md->queue.card;
1109 unsigned int from, nr;
1110 int err = 0, type = MMC_BLK_DISCARD;
1111 blk_status_t status = BLK_STS_OK;
1113 if (!mmc_can_erase(card)) {
1114 status = BLK_STS_NOTSUPP;
1118 from = blk_rq_pos(req);
1119 nr = blk_rq_sectors(req);
1123 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1124 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1125 INAND_CMD38_ARG_EXT_CSD,
1126 card->erase_arg == MMC_TRIM_ARG ?
1127 INAND_CMD38_ARG_TRIM :
1128 INAND_CMD38_ARG_ERASE,
1129 card->ext_csd.generic_cmd6_time);
1132 err = mmc_erase(card, from, nr, card->erase_arg);
1133 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1135 status = BLK_STS_IOERR;
1137 mmc_blk_reset_success(md, type);
1139 blk_mq_end_request(req, status);
1142 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1143 struct request *req)
1145 struct mmc_blk_data *md = mq->blkdata;
1146 struct mmc_card *card = md->queue.card;
1147 unsigned int from, nr, arg;
1148 int err = 0, type = MMC_BLK_SECDISCARD;
1149 blk_status_t status = BLK_STS_OK;
1151 if (!(mmc_can_secure_erase_trim(card))) {
1152 status = BLK_STS_NOTSUPP;
1156 from = blk_rq_pos(req);
1157 nr = blk_rq_sectors(req);
1159 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1160 arg = MMC_SECURE_TRIM1_ARG;
1162 arg = MMC_SECURE_ERASE_ARG;
1165 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1166 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1167 INAND_CMD38_ARG_EXT_CSD,
1168 arg == MMC_SECURE_TRIM1_ARG ?
1169 INAND_CMD38_ARG_SECTRIM1 :
1170 INAND_CMD38_ARG_SECERASE,
1171 card->ext_csd.generic_cmd6_time);
1176 err = mmc_erase(card, from, nr, arg);
1180 status = BLK_STS_IOERR;
1184 if (arg == MMC_SECURE_TRIM1_ARG) {
1185 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1186 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1187 INAND_CMD38_ARG_EXT_CSD,
1188 INAND_CMD38_ARG_SECTRIM2,
1189 card->ext_csd.generic_cmd6_time);
1194 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1198 status = BLK_STS_IOERR;
1204 if (err && !mmc_blk_reset(md, card->host, type))
1207 mmc_blk_reset_success(md, type);
1209 blk_mq_end_request(req, status);
1212 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1214 struct mmc_blk_data *md = mq->blkdata;
1215 struct mmc_card *card = md->queue.card;
1218 ret = mmc_flush_cache(card);
1219 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1223 * Reformat current write as a reliable write, supporting
1224 * both legacy and the enhanced reliable write MMC cards.
1225 * In each transfer we'll handle only as much as a single
1226 * reliable write can handle, thus finish the request in
1227 * partial completions.
1229 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1230 struct mmc_card *card,
1231 struct request *req)
1233 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1234 /* Legacy mode imposes restrictions on transfers. */
1235 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1236 brq->data.blocks = 1;
1238 if (brq->data.blocks > card->ext_csd.rel_sectors)
1239 brq->data.blocks = card->ext_csd.rel_sectors;
1240 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1241 brq->data.blocks = 1;
1245 #define CMD_ERRORS_EXCL_OOR \
1246 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1247 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1248 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1249 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1250 R1_CC_ERROR | /* Card controller error */ \
1251 R1_ERROR) /* General/unknown error */
1253 #define CMD_ERRORS \
1254 (CMD_ERRORS_EXCL_OOR | \
1255 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1257 static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1262 * Per the SD specification(physical layer version 4.10)[1],
1263 * section 4.3.3, it explicitly states that "When the last
1264 * block of user area is read using CMD18, the host should
1265 * ignore OUT_OF_RANGE error that may occur even the sequence
1266 * is correct". And JESD84-B51 for eMMC also has a similar
1267 * statement on section 6.8.3.
1269 * Multiple block read/write could be done by either predefined
1270 * method, namely CMD23, or open-ending mode. For open-ending mode,
1271 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1273 * However the spec[1] doesn't tell us whether we should also
1274 * ignore that for predefined method. But per the spec[1], section
1275 * 4.15 Set Block Count Command, it says"If illegal block count
1276 * is set, out of range error will be indicated during read/write
1277 * operation (For example, data transfer is stopped at user area
1278 * boundary)." In another word, we could expect a out of range error
1279 * in the response for the following CMD18/25. And if argument of
1280 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1281 * we could also expect to get a -ETIMEDOUT or any error number from
1282 * the host drivers due to missing data response(for write)/data(for
1283 * read), as the cards will stop the data transfer by itself per the
1284 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1287 if (!brq->stop.error) {
1288 bool oor_with_open_end;
1289 /* If there is no error yet, check R1 response */
1291 val = brq->stop.resp[0] & CMD_ERRORS;
1292 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1294 if (val && !oor_with_open_end)
1295 brq->stop.error = -EIO;
1299 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1300 int disable_multi, bool *do_rel_wr_p,
1301 bool *do_data_tag_p)
1303 struct mmc_blk_data *md = mq->blkdata;
1304 struct mmc_card *card = md->queue.card;
1305 struct mmc_blk_request *brq = &mqrq->brq;
1306 struct request *req = mmc_queue_req_to_req(mqrq);
1307 bool do_rel_wr, do_data_tag;
1310 * Reliable writes are used to implement Forced Unit Access and
1311 * are supported only on MMCs.
1313 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1314 rq_data_dir(req) == WRITE &&
1315 (md->flags & MMC_BLK_REL_WR);
1317 memset(brq, 0, sizeof(struct mmc_blk_request));
1319 brq->mrq.data = &brq->data;
1320 brq->mrq.tag = req->tag;
1322 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1325 if (rq_data_dir(req) == READ) {
1326 brq->data.flags = MMC_DATA_READ;
1327 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1329 brq->data.flags = MMC_DATA_WRITE;
1330 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1333 brq->data.blksz = 512;
1334 brq->data.blocks = blk_rq_sectors(req);
1335 brq->data.blk_addr = blk_rq_pos(req);
1338 * The command queue supports 2 priorities: "high" (1) and "simple" (0).
1339 * The eMMC will give "high" priority tasks priority over "simple"
1340 * priority tasks. Here we always set "simple" priority by not setting
1345 * The block layer doesn't support all sector count
1346 * restrictions, so we need to be prepared for too big
1349 if (brq->data.blocks > card->host->max_blk_count)
1350 brq->data.blocks = card->host->max_blk_count;
1352 if (brq->data.blocks > 1) {
1354 * Some SD cards in SPI mode return a CRC error or even lock up
1355 * completely when trying to read the last block using a
1356 * multiblock read command.
1358 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
1359 (blk_rq_pos(req) + blk_rq_sectors(req) ==
1360 get_capacity(md->disk)))
1364 * After a read error, we redo the request one sector
1365 * at a time in order to accurately determine which
1366 * sectors can be read successfully.
1369 brq->data.blocks = 1;
1372 * Some controllers have HW issues while operating
1373 * in multiple I/O mode
1375 if (card->host->ops->multi_io_quirk)
1376 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1377 (rq_data_dir(req) == READ) ?
1378 MMC_DATA_READ : MMC_DATA_WRITE,
1383 mmc_apply_rel_rw(brq, card, req);
1384 brq->data.flags |= MMC_DATA_REL_WR;
1388 * Data tag is used only during writing meta data to speed
1389 * up write and any subsequent read of this meta data
1391 do_data_tag = card->ext_csd.data_tag_unit_size &&
1392 (req->cmd_flags & REQ_META) &&
1393 (rq_data_dir(req) == WRITE) &&
1394 ((brq->data.blocks * brq->data.blksz) >=
1395 card->ext_csd.data_tag_unit_size);
1398 brq->data.flags |= MMC_DATA_DAT_TAG;
1400 mmc_set_data_timeout(&brq->data, card);
1402 brq->data.sg = mqrq->sg;
1403 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1406 * Adjust the sg list so it is the same size as the
1409 if (brq->data.blocks != blk_rq_sectors(req)) {
1410 int i, data_size = brq->data.blocks << 9;
1411 struct scatterlist *sg;
1413 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1414 data_size -= sg->length;
1415 if (data_size <= 0) {
1416 sg->length += data_size;
1421 brq->data.sg_len = i;
1425 *do_rel_wr_p = do_rel_wr;
1428 *do_data_tag_p = do_data_tag;
1431 #define MMC_CQE_RETRIES 2
1433 static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
1435 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1436 struct mmc_request *mrq = &mqrq->brq.mrq;
1437 struct request_queue *q = req->q;
1438 struct mmc_host *host = mq->card->host;
1439 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
1440 unsigned long flags;
1444 mmc_cqe_post_req(host, mrq);
1446 if (mrq->cmd && mrq->cmd->error)
1447 err = mrq->cmd->error;
1448 else if (mrq->data && mrq->data->error)
1449 err = mrq->data->error;
1454 if (mqrq->retries++ < MMC_CQE_RETRIES)
1455 blk_mq_requeue_request(req, true);
1457 blk_mq_end_request(req, BLK_STS_IOERR);
1458 } else if (mrq->data) {
1459 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
1460 blk_mq_requeue_request(req, true);
1462 __blk_mq_end_request(req, BLK_STS_OK);
1464 blk_mq_end_request(req, BLK_STS_OK);
1467 spin_lock_irqsave(&mq->lock, flags);
1469 mq->in_flight[issue_type] -= 1;
1471 put_card = (mmc_tot_in_flight(mq) == 0);
1473 mmc_cqe_check_busy(mq);
1475 spin_unlock_irqrestore(&mq->lock, flags);
1478 blk_mq_run_hw_queues(q, true);
1481 mmc_put_card(mq->card, &mq->ctx);
1484 void mmc_blk_cqe_recovery(struct mmc_queue *mq)
1486 struct mmc_card *card = mq->card;
1487 struct mmc_host *host = card->host;
1490 pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
1492 err = mmc_cqe_recovery(host);
1494 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
1495 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1497 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1500 static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1502 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1504 struct request *req = mmc_queue_req_to_req(mqrq);
1505 struct request_queue *q = req->q;
1506 struct mmc_queue *mq = q->queuedata;
1509 * Block layer timeouts race with completions which means the normal
1510 * completion path cannot be used during recovery.
1512 if (mq->in_recovery)
1513 mmc_blk_cqe_complete_rq(mq, req);
1515 blk_mq_complete_request(req);
1518 static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1520 mrq->done = mmc_blk_cqe_req_done;
1521 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1523 return mmc_cqe_start_req(host, mrq);
1526 static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1527 struct request *req)
1529 struct mmc_blk_request *brq = &mqrq->brq;
1531 memset(brq, 0, sizeof(*brq));
1533 brq->mrq.cmd = &brq->cmd;
1534 brq->mrq.tag = req->tag;
1539 static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1541 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1542 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1544 mrq->cmd->opcode = MMC_SWITCH;
1545 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1546 (EXT_CSD_FLUSH_CACHE << 16) |
1548 EXT_CSD_CMD_SET_NORMAL;
1549 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1551 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1554 static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1556 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1558 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1560 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1563 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1564 struct mmc_card *card,
1566 struct mmc_queue *mq)
1568 u32 readcmd, writecmd;
1569 struct mmc_blk_request *brq = &mqrq->brq;
1570 struct request *req = mmc_queue_req_to_req(mqrq);
1571 struct mmc_blk_data *md = mq->blkdata;
1572 bool do_rel_wr, do_data_tag;
1574 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1576 brq->mrq.cmd = &brq->cmd;
1578 brq->cmd.arg = blk_rq_pos(req);
1579 if (!mmc_card_blockaddr(card))
1581 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1583 if (brq->data.blocks > 1 || do_rel_wr) {
1584 /* SPI multiblock writes terminate using a special
1585 * token, not a STOP_TRANSMISSION request.
1587 if (!mmc_host_is_spi(card->host) ||
1588 rq_data_dir(req) == READ)
1589 brq->mrq.stop = &brq->stop;
1590 readcmd = MMC_READ_MULTIPLE_BLOCK;
1591 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1593 brq->mrq.stop = NULL;
1594 readcmd = MMC_READ_SINGLE_BLOCK;
1595 writecmd = MMC_WRITE_BLOCK;
1597 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1600 * Pre-defined multi-block transfers are preferable to
1601 * open ended-ones (and necessary for reliable writes).
1602 * However, it is not sufficient to just send CMD23,
1603 * and avoid the final CMD12, as on an error condition
1604 * CMD12 (stop) needs to be sent anyway. This, coupled
1605 * with Auto-CMD23 enhancements provided by some
1606 * hosts, means that the complexity of dealing
1607 * with this is best left to the host. If CMD23 is
1608 * supported by card and host, we'll fill sbc in and let
1609 * the host deal with handling it correctly. This means
1610 * that for hosts that don't expose MMC_CAP_CMD23, no
1611 * change of behavior will be observed.
1613 * N.B: Some MMC cards experience perf degradation.
1614 * We'll avoid using CMD23-bounded multiblock writes for
1615 * these, while retaining features like reliable writes.
1617 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1618 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1620 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1621 brq->sbc.arg = brq->data.blocks |
1622 (do_rel_wr ? (1 << 31) : 0) |
1623 (do_data_tag ? (1 << 29) : 0);
1624 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1625 brq->mrq.sbc = &brq->sbc;
1629 #define MMC_MAX_RETRIES 5
1630 #define MMC_DATA_RETRIES 2
1631 #define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1633 static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1635 struct mmc_command cmd = {
1636 .opcode = MMC_STOP_TRANSMISSION,
1637 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1638 /* Some hosts wait for busy anyway, so provide a busy timeout */
1639 .busy_timeout = timeout,
1642 return mmc_wait_for_cmd(card->host, &cmd, 5);
1645 static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1647 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1648 struct mmc_blk_request *brq = &mqrq->brq;
1649 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1652 mmc_retune_hold_now(card->host);
1654 mmc_blk_send_stop(card, timeout);
1656 err = card_busy_detect(card, timeout, NULL);
1658 mmc_retune_release(card->host);
1663 #define MMC_READ_SINGLE_RETRIES 2
1665 /* Single sector read during recovery */
1666 static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1668 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1669 struct mmc_request *mrq = &mqrq->brq.mrq;
1670 struct mmc_card *card = mq->card;
1671 struct mmc_host *host = card->host;
1672 blk_status_t error = BLK_STS_OK;
1679 while (retries++ <= MMC_READ_SINGLE_RETRIES) {
1680 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1682 mmc_wait_for_req(host, mrq);
1684 err = mmc_send_status(card, &status);
1688 if (!mmc_host_is_spi(host) &&
1689 !mmc_blk_in_tran_state(status)) {
1690 err = mmc_blk_fix_state(card, req);
1695 if (!mrq->cmd->error)
1699 if (mrq->cmd->error ||
1701 (!mmc_host_is_spi(host) &&
1702 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1703 error = BLK_STS_IOERR;
1707 } while (blk_update_request(req, error, 512));
1712 mrq->data->bytes_xfered = 0;
1713 blk_update_request(req, BLK_STS_IOERR, 512);
1714 /* Let it try the remaining request again */
1715 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1716 mqrq->retries = MMC_MAX_RETRIES - 1;
1719 static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1721 return !!brq->mrq.sbc;
1724 static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1726 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1730 * Check for errors the host controller driver might not have seen such as
1731 * response mode errors or invalid card state.
1733 static bool mmc_blk_status_error(struct request *req, u32 status)
1735 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1736 struct mmc_blk_request *brq = &mqrq->brq;
1737 struct mmc_queue *mq = req->q->queuedata;
1740 if (mmc_host_is_spi(mq->card->host))
1743 stop_err_bits = mmc_blk_stop_err_bits(brq);
1745 return brq->cmd.resp[0] & CMD_ERRORS ||
1746 brq->stop.resp[0] & stop_err_bits ||
1747 status & stop_err_bits ||
1748 (rq_data_dir(req) == WRITE && !mmc_blk_in_tran_state(status));
1751 static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1753 return !brq->sbc.error && !brq->cmd.error &&
1754 !(brq->cmd.resp[0] & CMD_ERRORS);
1758 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1760 * 1. A request that has transferred at least some data is considered
1761 * successful and will be requeued if there is remaining data to
1763 * 2. Otherwise the number of retries is incremented and the request
1764 * will be requeued if there are remaining retries.
1765 * 3. Otherwise the request will be errored out.
1766 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1767 * mqrq->retries. So there are only 4 possible actions here:
1768 * 1. do not accept the bytes_xfered value i.e. set it to zero
1769 * 2. change mqrq->retries to determine the number of retries
1770 * 3. try to reset the card
1771 * 4. read one sector at a time
1773 static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1775 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1776 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1777 struct mmc_blk_request *brq = &mqrq->brq;
1778 struct mmc_blk_data *md = mq->blkdata;
1779 struct mmc_card *card = mq->card;
1785 * Some errors the host driver might not have seen. Set the number of
1786 * bytes transferred to zero in that case.
1788 err = __mmc_send_status(card, &status, 0);
1789 if (err || mmc_blk_status_error(req, status))
1790 brq->data.bytes_xfered = 0;
1792 mmc_retune_release(card->host);
1795 * Try again to get the status. This also provides an opportunity for
1799 err = __mmc_send_status(card, &status, 0);
1802 * Nothing more to do after the number of bytes transferred has been
1803 * updated and there is no card.
1805 if (err && mmc_detect_card_removed(card->host))
1808 /* Try to get back to "tran" state */
1809 if (!mmc_host_is_spi(mq->card->host) &&
1810 (err || !mmc_blk_in_tran_state(status)))
1811 err = mmc_blk_fix_state(mq->card, req);
1814 * Special case for SD cards where the card might record the number of
1817 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1818 rq_data_dir(req) == WRITE) {
1819 if (mmc_sd_num_wr_blocks(card, &blocks))
1820 brq->data.bytes_xfered = 0;
1822 brq->data.bytes_xfered = blocks << 9;
1825 /* Reset if the card is in a bad state */
1826 if (!mmc_host_is_spi(mq->card->host) &&
1827 err && mmc_blk_reset(md, card->host, type)) {
1828 pr_err("%s: recovery failed!\n", req->rq_disk->disk_name);
1829 mqrq->retries = MMC_NO_RETRIES;
1834 * If anything was done, just return and if there is anything remaining
1835 * on the request it will get requeued.
1837 if (brq->data.bytes_xfered)
1840 /* Reset before last retry */
1841 if (mqrq->retries + 1 == MMC_MAX_RETRIES)
1842 mmc_blk_reset(md, card->host, type);
1844 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
1845 if (brq->sbc.error || brq->cmd.error)
1848 /* Reduce the remaining retries for data errors */
1849 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
1850 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
1854 /* FIXME: Missing single sector read for large sector size */
1855 if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
1856 brq->data.blocks > 1) {
1857 /* Read one sector at a time */
1858 mmc_blk_read_single(mq, req);
1863 static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
1865 mmc_blk_eval_resp_error(brq);
1867 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
1868 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
1871 static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
1873 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1877 if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ)
1880 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status);
1883 * Do not assume data transferred correctly if there are any error bits
1886 if (status & mmc_blk_stop_err_bits(&mqrq->brq)) {
1887 mqrq->brq.data.bytes_xfered = 0;
1888 err = err ? err : -EIO;
1891 /* Copy the exception bit so it will be seen later on */
1892 if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT)
1893 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
1898 static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
1899 struct request *req)
1901 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1903 mmc_blk_reset_success(mq->blkdata, type);
1906 static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
1908 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1909 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
1912 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
1913 blk_mq_requeue_request(req, true);
1915 __blk_mq_end_request(req, BLK_STS_OK);
1916 } else if (!blk_rq_bytes(req)) {
1917 __blk_mq_end_request(req, BLK_STS_IOERR);
1918 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
1919 blk_mq_requeue_request(req, true);
1921 if (mmc_card_removed(mq->card))
1922 req->rq_flags |= RQF_QUIET;
1923 blk_mq_end_request(req, BLK_STS_IOERR);
1927 static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
1928 struct mmc_queue_req *mqrq)
1930 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
1931 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
1932 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
1935 static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
1936 struct mmc_queue_req *mqrq)
1938 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
1939 mmc_run_bkops(mq->card);
1942 void mmc_blk_mq_complete(struct request *req)
1944 struct mmc_queue *mq = req->q->queuedata;
1947 mmc_blk_cqe_complete_rq(mq, req);
1949 mmc_blk_mq_complete_rq(mq, req);
1952 static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
1953 struct request *req)
1955 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1956 struct mmc_host *host = mq->card->host;
1958 if (mmc_blk_rq_error(&mqrq->brq) ||
1959 mmc_blk_card_busy(mq->card, req)) {
1960 mmc_blk_mq_rw_recovery(mq, req);
1962 mmc_blk_rw_reset_success(mq, req);
1963 mmc_retune_release(host);
1966 mmc_blk_urgent_bkops(mq, mqrq);
1969 static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
1971 unsigned long flags;
1974 spin_lock_irqsave(&mq->lock, flags);
1976 mq->in_flight[mmc_issue_type(mq, req)] -= 1;
1978 put_card = (mmc_tot_in_flight(mq) == 0);
1980 spin_unlock_irqrestore(&mq->lock, flags);
1983 mmc_put_card(mq->card, &mq->ctx);
1986 static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req)
1988 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1989 struct mmc_request *mrq = &mqrq->brq.mrq;
1990 struct mmc_host *host = mq->card->host;
1992 mmc_post_req(host, mrq, 0);
1995 * Block layer timeouts race with completions which means the normal
1996 * completion path cannot be used during recovery.
1998 if (mq->in_recovery)
1999 mmc_blk_mq_complete_rq(mq, req);
2001 blk_mq_complete_request(req);
2003 mmc_blk_mq_dec_in_flight(mq, req);
2006 void mmc_blk_mq_recovery(struct mmc_queue *mq)
2008 struct request *req = mq->recovery_req;
2009 struct mmc_host *host = mq->card->host;
2010 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2012 mq->recovery_req = NULL;
2013 mq->rw_wait = false;
2015 if (mmc_blk_rq_error(&mqrq->brq)) {
2016 mmc_retune_hold_now(host);
2017 mmc_blk_mq_rw_recovery(mq, req);
2020 mmc_blk_urgent_bkops(mq, mqrq);
2022 mmc_blk_mq_post_req(mq, req);
2025 static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2026 struct request **prev_req)
2028 if (mmc_host_done_complete(mq->card->host))
2031 mutex_lock(&mq->complete_lock);
2033 if (!mq->complete_req)
2036 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2039 *prev_req = mq->complete_req;
2041 mmc_blk_mq_post_req(mq, mq->complete_req);
2043 mq->complete_req = NULL;
2046 mutex_unlock(&mq->complete_lock);
2049 void mmc_blk_mq_complete_work(struct work_struct *work)
2051 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2054 mmc_blk_mq_complete_prev_req(mq, NULL);
2057 static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2059 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2061 struct request *req = mmc_queue_req_to_req(mqrq);
2062 struct request_queue *q = req->q;
2063 struct mmc_queue *mq = q->queuedata;
2064 struct mmc_host *host = mq->card->host;
2065 unsigned long flags;
2067 if (!mmc_host_done_complete(host)) {
2071 * We cannot complete the request in this context, so record
2072 * that there is a request to complete, and that a following
2073 * request does not need to wait (although it does need to
2074 * complete complete_req first).
2076 spin_lock_irqsave(&mq->lock, flags);
2077 mq->complete_req = req;
2078 mq->rw_wait = false;
2079 waiting = mq->waiting;
2080 spin_unlock_irqrestore(&mq->lock, flags);
2083 * If 'waiting' then the waiting task will complete this
2084 * request, otherwise queue a work to do it. Note that
2085 * complete_work may still race with the dispatch of a following
2091 queue_work(mq->card->complete_wq, &mq->complete_work);
2096 /* Take the recovery path for errors or urgent background operations */
2097 if (mmc_blk_rq_error(&mqrq->brq) ||
2098 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2099 spin_lock_irqsave(&mq->lock, flags);
2100 mq->recovery_needed = true;
2101 mq->recovery_req = req;
2102 spin_unlock_irqrestore(&mq->lock, flags);
2104 schedule_work(&mq->recovery_work);
2108 mmc_blk_rw_reset_success(mq, req);
2110 mq->rw_wait = false;
2113 mmc_blk_mq_post_req(mq, req);
2116 static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2118 unsigned long flags;
2122 * Wait while there is another request in progress, but not if recovery
2123 * is needed. Also indicate whether there is a request waiting to start.
2125 spin_lock_irqsave(&mq->lock, flags);
2126 if (mq->recovery_needed) {
2130 done = !mq->rw_wait;
2132 mq->waiting = !done;
2133 spin_unlock_irqrestore(&mq->lock, flags);
2138 static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2142 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2144 /* Always complete the previous request if there is one */
2145 mmc_blk_mq_complete_prev_req(mq, prev_req);
2150 static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2151 struct request *req)
2153 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2154 struct mmc_host *host = mq->card->host;
2155 struct request *prev_req = NULL;
2158 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2160 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2162 mmc_pre_req(host, &mqrq->brq.mrq);
2164 err = mmc_blk_rw_wait(mq, &prev_req);
2170 err = mmc_start_request(host, &mqrq->brq.mrq);
2173 mmc_blk_mq_post_req(mq, prev_req);
2176 mq->rw_wait = false;
2178 /* Release re-tuning here where there is no synchronization required */
2179 if (err || mmc_host_done_complete(host))
2180 mmc_retune_release(host);
2184 mmc_post_req(host, &mqrq->brq.mrq, err);
2189 static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2192 return host->cqe_ops->cqe_wait_for_idle(host);
2194 return mmc_blk_rw_wait(mq, NULL);
2197 enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2199 struct mmc_blk_data *md = mq->blkdata;
2200 struct mmc_card *card = md->queue.card;
2201 struct mmc_host *host = card->host;
2204 ret = mmc_blk_part_switch(card, md->part_type);
2206 return MMC_REQ_FAILED_TO_START;
2208 switch (mmc_issue_type(mq, req)) {
2209 case MMC_ISSUE_SYNC:
2210 ret = mmc_blk_wait_for_idle(mq, host);
2212 return MMC_REQ_BUSY;
2213 switch (req_op(req)) {
2215 case REQ_OP_DRV_OUT:
2216 mmc_blk_issue_drv_op(mq, req);
2218 case REQ_OP_DISCARD:
2219 mmc_blk_issue_discard_rq(mq, req);
2221 case REQ_OP_SECURE_ERASE:
2222 mmc_blk_issue_secdiscard_rq(mq, req);
2225 mmc_blk_issue_flush(mq, req);
2229 return MMC_REQ_FAILED_TO_START;
2231 return MMC_REQ_FINISHED;
2232 case MMC_ISSUE_DCMD:
2233 case MMC_ISSUE_ASYNC:
2234 switch (req_op(req)) {
2236 if (!mmc_cache_enabled(host)) {
2237 blk_mq_end_request(req, BLK_STS_OK);
2238 return MMC_REQ_FINISHED;
2240 ret = mmc_blk_cqe_issue_flush(mq, req);
2245 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2247 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2254 return MMC_REQ_STARTED;
2255 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2258 return MMC_REQ_FAILED_TO_START;
2262 static inline int mmc_blk_readonly(struct mmc_card *card)
2264 return mmc_card_readonly(card) ||
2265 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2268 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2269 struct device *parent,
2272 const char *subname,
2275 struct mmc_blk_data *md;
2278 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2281 * We get -ENOSPC because there are no more any available
2282 * devidx. The reason may be that, either userspace haven't yet
2283 * unmounted the partitions, which postpones mmc_blk_release()
2284 * from being called, or the device has more partitions than
2287 if (devidx == -ENOSPC)
2288 dev_err(mmc_dev(card->host),
2289 "no more device IDs available\n");
2291 return ERR_PTR(devidx);
2294 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2300 md->area_type = area_type;
2303 * Set the read-only status based on the supported commands
2304 * and the write protect switch.
2306 md->read_only = mmc_blk_readonly(card);
2308 md->disk = alloc_disk(perdev_minors);
2309 if (md->disk == NULL) {
2314 INIT_LIST_HEAD(&md->part);
2315 INIT_LIST_HEAD(&md->rpmbs);
2318 ret = mmc_init_queue(&md->queue, card);
2322 md->queue.blkdata = md;
2325 * Keep an extra reference to the queue so that we can shutdown the
2326 * queue (i.e. call blk_cleanup_queue()) while there are still
2327 * references to the 'md'. The corresponding blk_put_queue() is in
2330 if (!blk_get_queue(md->queue.queue)) {
2331 mmc_cleanup_queue(&md->queue);
2336 md->disk->major = MMC_BLOCK_MAJOR;
2337 md->disk->first_minor = devidx * perdev_minors;
2338 md->disk->fops = &mmc_bdops;
2339 md->disk->private_data = md;
2340 md->disk->queue = md->queue.queue;
2341 md->parent = parent;
2342 set_disk_ro(md->disk, md->read_only || default_ro);
2343 md->disk->flags = GENHD_FL_EXT_DEVT;
2344 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2345 md->disk->flags |= GENHD_FL_NO_PART_SCAN
2346 | GENHD_FL_SUPPRESS_PARTITION_INFO;
2349 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2351 * - be set for removable media with permanent block devices
2352 * - be unset for removable block devices with permanent media
2354 * Since MMC block devices clearly fall under the second
2355 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2356 * should use the block device creation/destruction hotplug
2357 * messages to tell when the card is present.
2360 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2361 "mmcblk%u%s", card->host->index, subname ? subname : "");
2363 set_capacity(md->disk, size);
2365 if (mmc_host_cmd23(card->host)) {
2366 if ((mmc_card_mmc(card) &&
2367 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2368 (mmc_card_sd(card) &&
2369 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2370 md->flags |= MMC_BLK_CMD23;
2373 if (mmc_card_mmc(card) &&
2374 md->flags & MMC_BLK_CMD23 &&
2375 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2376 card->ext_csd.rel_sectors)) {
2377 md->flags |= MMC_BLK_REL_WR;
2378 blk_queue_write_cache(md->queue.queue, true, true);
2388 ida_simple_remove(&mmc_blk_ida, devidx);
2389 return ERR_PTR(ret);
2392 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2396 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2398 * The EXT_CSD sector count is in number or 512 byte
2401 size = card->ext_csd.sectors;
2404 * The CSD capacity field is in units of read_blkbits.
2405 * set_capacity takes units of 512 bytes.
2407 size = (typeof(sector_t))card->csd.capacity
2408 << (card->csd.read_blkbits - 9);
2411 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2412 MMC_BLK_DATA_AREA_MAIN);
2415 static int mmc_blk_alloc_part(struct mmc_card *card,
2416 struct mmc_blk_data *md,
2417 unsigned int part_type,
2420 const char *subname,
2424 struct mmc_blk_data *part_md;
2426 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2427 subname, area_type);
2428 if (IS_ERR(part_md))
2429 return PTR_ERR(part_md);
2430 part_md->part_type = part_type;
2431 list_add(&part_md->part, &md->part);
2433 string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2434 cap_str, sizeof(cap_str));
2435 pr_info("%s: %s %s partition %u %s\n",
2436 part_md->disk->disk_name, mmc_card_id(card),
2437 mmc_card_name(card), part_md->part_type, cap_str);
2442 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2443 * @filp: the character device file
2444 * @cmd: the ioctl() command
2445 * @arg: the argument from userspace
2447 * This will essentially just redirect the ioctl()s coming in over to
2448 * the main block device spawning the RPMB character device.
2450 static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2453 struct mmc_rpmb_data *rpmb = filp->private_data;
2458 ret = mmc_blk_ioctl_cmd(rpmb->md,
2459 (struct mmc_ioc_cmd __user *)arg,
2462 case MMC_IOC_MULTI_CMD:
2463 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2464 (struct mmc_ioc_multi_cmd __user *)arg,
2475 #ifdef CONFIG_COMPAT
2476 static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2479 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2483 static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2485 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2486 struct mmc_rpmb_data, chrdev);
2488 get_device(&rpmb->dev);
2489 filp->private_data = rpmb;
2490 mmc_blk_get(rpmb->md->disk);
2492 return nonseekable_open(inode, filp);
2495 static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2497 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2498 struct mmc_rpmb_data, chrdev);
2500 mmc_blk_put(rpmb->md);
2501 put_device(&rpmb->dev);
2506 static const struct file_operations mmc_rpmb_fileops = {
2507 .release = mmc_rpmb_chrdev_release,
2508 .open = mmc_rpmb_chrdev_open,
2509 .owner = THIS_MODULE,
2510 .llseek = no_llseek,
2511 .unlocked_ioctl = mmc_rpmb_ioctl,
2512 #ifdef CONFIG_COMPAT
2513 .compat_ioctl = mmc_rpmb_ioctl_compat,
2517 static void mmc_blk_rpmb_device_release(struct device *dev)
2519 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2521 ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
2525 static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2526 struct mmc_blk_data *md,
2527 unsigned int part_index,
2529 const char *subname)
2532 char rpmb_name[DISK_NAME_LEN];
2534 struct mmc_rpmb_data *rpmb;
2536 /* This creates the minor number for the RPMB char device */
2537 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
2541 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2543 ida_simple_remove(&mmc_rpmb_ida, devidx);
2547 snprintf(rpmb_name, sizeof(rpmb_name),
2548 "mmcblk%u%s", card->host->index, subname ? subname : "");
2551 rpmb->part_index = part_index;
2552 rpmb->dev.init_name = rpmb_name;
2553 rpmb->dev.bus = &mmc_rpmb_bus_type;
2554 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
2555 rpmb->dev.parent = &card->dev;
2556 rpmb->dev.release = mmc_blk_rpmb_device_release;
2557 device_initialize(&rpmb->dev);
2558 dev_set_drvdata(&rpmb->dev, rpmb);
2561 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
2562 rpmb->chrdev.owner = THIS_MODULE;
2563 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
2565 pr_err("%s: could not add character device\n", rpmb_name);
2566 goto out_put_device;
2569 list_add(&rpmb->node, &md->rpmbs);
2571 string_get_size((u64)size, 512, STRING_UNITS_2,
2572 cap_str, sizeof(cap_str));
2574 pr_info("%s: %s %s partition %u %s, chardev (%d:%d)\n",
2575 rpmb_name, mmc_card_id(card),
2576 mmc_card_name(card), EXT_CSD_PART_CONFIG_ACC_RPMB, cap_str,
2577 MAJOR(mmc_rpmb_devt), rpmb->id);
2582 put_device(&rpmb->dev);
2586 static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
2589 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
2590 put_device(&rpmb->dev);
2593 /* MMC Physical partitions consist of two boot partitions and
2594 * up to four general purpose partitions.
2595 * For each partition enabled in EXT_CSD a block device will be allocatedi
2596 * to provide access to the partition.
2599 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2603 if (!mmc_card_mmc(card))
2606 for (idx = 0; idx < card->nr_parts; idx++) {
2607 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
2609 * RPMB partitions does not provide block access, they
2610 * are only accessed using ioctl():s. Thus create
2611 * special RPMB block devices that do not have a
2612 * backing block queue for these.
2614 ret = mmc_blk_alloc_rpmb_part(card, md,
2615 card->part[idx].part_cfg,
2616 card->part[idx].size >> 9,
2617 card->part[idx].name);
2620 } else if (card->part[idx].size) {
2621 ret = mmc_blk_alloc_part(card, md,
2622 card->part[idx].part_cfg,
2623 card->part[idx].size >> 9,
2624 card->part[idx].force_ro,
2625 card->part[idx].name,
2626 card->part[idx].area_type);
2635 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2637 struct mmc_card *card;
2641 * Flush remaining requests and free queues. It
2642 * is freeing the queue that stops new requests
2643 * from being accepted.
2645 card = md->queue.card;
2646 if (md->disk->flags & GENHD_FL_UP) {
2647 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2648 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2649 card->ext_csd.boot_ro_lockable)
2650 device_remove_file(disk_to_dev(md->disk),
2651 &md->power_ro_lock);
2653 del_gendisk(md->disk);
2655 mmc_cleanup_queue(&md->queue);
2660 static void mmc_blk_remove_parts(struct mmc_card *card,
2661 struct mmc_blk_data *md)
2663 struct list_head *pos, *q;
2664 struct mmc_blk_data *part_md;
2665 struct mmc_rpmb_data *rpmb;
2667 /* Remove RPMB partitions */
2668 list_for_each_safe(pos, q, &md->rpmbs) {
2669 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
2671 mmc_blk_remove_rpmb_part(rpmb);
2673 /* Remove block partitions */
2674 list_for_each_safe(pos, q, &md->part) {
2675 part_md = list_entry(pos, struct mmc_blk_data, part);
2677 mmc_blk_remove_req(part_md);
2681 static int mmc_add_disk(struct mmc_blk_data *md)
2684 struct mmc_card *card = md->queue.card;
2686 device_add_disk(md->parent, md->disk, NULL);
2687 md->force_ro.show = force_ro_show;
2688 md->force_ro.store = force_ro_store;
2689 sysfs_attr_init(&md->force_ro.attr);
2690 md->force_ro.attr.name = "force_ro";
2691 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2692 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2696 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2697 card->ext_csd.boot_ro_lockable) {
2700 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2703 mode = S_IRUGO | S_IWUSR;
2705 md->power_ro_lock.show = power_ro_lock_show;
2706 md->power_ro_lock.store = power_ro_lock_store;
2707 sysfs_attr_init(&md->power_ro_lock.attr);
2708 md->power_ro_lock.attr.mode = mode;
2709 md->power_ro_lock.attr.name =
2710 "ro_lock_until_next_power_on";
2711 ret = device_create_file(disk_to_dev(md->disk),
2712 &md->power_ro_lock);
2714 goto power_ro_lock_fail;
2719 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2721 del_gendisk(md->disk);
2726 #ifdef CONFIG_DEBUG_FS
2728 static int mmc_dbg_card_status_get(void *data, u64 *val)
2730 struct mmc_card *card = data;
2731 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2732 struct mmc_queue *mq = &md->queue;
2733 struct request *req;
2736 /* Ask the block layer about the card status */
2737 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2739 return PTR_ERR(req);
2740 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
2741 blk_execute_rq(mq->queue, NULL, req, 0);
2742 ret = req_to_mmc_queue_req(req)->drv_op_result;
2747 blk_put_request(req);
2751 DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
2754 /* That is two digits * 512 + 1 for newline */
2755 #define EXT_CSD_STR_LEN 1025
2757 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
2759 struct mmc_card *card = inode->i_private;
2760 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2761 struct mmc_queue *mq = &md->queue;
2762 struct request *req;
2768 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
2772 /* Ask the block layer for the EXT CSD */
2773 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2778 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
2779 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
2780 blk_execute_rq(mq->queue, NULL, req, 0);
2781 err = req_to_mmc_queue_req(req)->drv_op_result;
2782 blk_put_request(req);
2784 pr_err("FAILED %d\n", err);
2788 for (i = 0; i < 512; i++)
2789 n += sprintf(buf + n, "%02x", ext_csd[i]);
2790 n += sprintf(buf + n, "\n");
2792 if (n != EXT_CSD_STR_LEN) {
2798 filp->private_data = buf;
2807 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
2808 size_t cnt, loff_t *ppos)
2810 char *buf = filp->private_data;
2812 return simple_read_from_buffer(ubuf, cnt, ppos,
2813 buf, EXT_CSD_STR_LEN);
2816 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
2818 kfree(file->private_data);
2822 static const struct file_operations mmc_dbg_ext_csd_fops = {
2823 .open = mmc_ext_csd_open,
2824 .read = mmc_ext_csd_read,
2825 .release = mmc_ext_csd_release,
2826 .llseek = default_llseek,
2829 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2831 struct dentry *root;
2833 if (!card->debugfs_root)
2836 root = card->debugfs_root;
2838 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
2840 debugfs_create_file_unsafe("status", 0400, root,
2842 &mmc_dbg_card_status_fops);
2843 if (!md->status_dentry)
2847 if (mmc_card_mmc(card)) {
2848 md->ext_csd_dentry =
2849 debugfs_create_file("ext_csd", S_IRUSR, root, card,
2850 &mmc_dbg_ext_csd_fops);
2851 if (!md->ext_csd_dentry)
2858 static void mmc_blk_remove_debugfs(struct mmc_card *card,
2859 struct mmc_blk_data *md)
2861 if (!card->debugfs_root)
2864 if (!IS_ERR_OR_NULL(md->status_dentry)) {
2865 debugfs_remove(md->status_dentry);
2866 md->status_dentry = NULL;
2869 if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) {
2870 debugfs_remove(md->ext_csd_dentry);
2871 md->ext_csd_dentry = NULL;
2877 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2882 static void mmc_blk_remove_debugfs(struct mmc_card *card,
2883 struct mmc_blk_data *md)
2887 #endif /* CONFIG_DEBUG_FS */
2889 static int mmc_blk_probe(struct mmc_card *card)
2891 struct mmc_blk_data *md, *part_md;
2895 * Check that the card supports the command class(es) we need.
2897 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2900 mmc_fixup_device(card, mmc_blk_fixups);
2902 card->complete_wq = alloc_workqueue("mmc_complete",
2903 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
2904 if (unlikely(!card->complete_wq)) {
2905 pr_err("Failed to create mmc completion workqueue");
2909 md = mmc_blk_alloc(card);
2913 string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2914 cap_str, sizeof(cap_str));
2915 pr_info("%s: %s %s %s %s\n",
2916 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2917 cap_str, md->read_only ? "(ro)" : "");
2919 if (mmc_blk_alloc_parts(card, md))
2922 dev_set_drvdata(&card->dev, md);
2924 if (mmc_add_disk(md))
2927 list_for_each_entry(part_md, &md->part, part) {
2928 if (mmc_add_disk(part_md))
2932 /* Add two debugfs entries */
2933 mmc_blk_add_debugfs(card, md);
2935 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2936 pm_runtime_use_autosuspend(&card->dev);
2939 * Don't enable runtime PM for SD-combo cards here. Leave that
2940 * decision to be taken during the SDIO init sequence instead.
2942 if (card->type != MMC_TYPE_SD_COMBO) {
2943 pm_runtime_set_active(&card->dev);
2944 pm_runtime_enable(&card->dev);
2950 mmc_blk_remove_parts(card, md);
2951 mmc_blk_remove_req(md);
2955 static void mmc_blk_remove(struct mmc_card *card)
2957 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2959 mmc_blk_remove_debugfs(card, md);
2960 mmc_blk_remove_parts(card, md);
2961 pm_runtime_get_sync(&card->dev);
2962 if (md->part_curr != md->part_type) {
2963 mmc_claim_host(card->host);
2964 mmc_blk_part_switch(card, md->part_type);
2965 mmc_release_host(card->host);
2967 if (card->type != MMC_TYPE_SD_COMBO)
2968 pm_runtime_disable(&card->dev);
2969 pm_runtime_put_noidle(&card->dev);
2970 mmc_blk_remove_req(md);
2971 dev_set_drvdata(&card->dev, NULL);
2972 destroy_workqueue(card->complete_wq);
2975 static int _mmc_blk_suspend(struct mmc_card *card)
2977 struct mmc_blk_data *part_md;
2978 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2981 mmc_queue_suspend(&md->queue);
2982 list_for_each_entry(part_md, &md->part, part) {
2983 mmc_queue_suspend(&part_md->queue);
2989 static void mmc_blk_shutdown(struct mmc_card *card)
2991 _mmc_blk_suspend(card);
2994 #ifdef CONFIG_PM_SLEEP
2995 static int mmc_blk_suspend(struct device *dev)
2997 struct mmc_card *card = mmc_dev_to_card(dev);
2999 return _mmc_blk_suspend(card);
3002 static int mmc_blk_resume(struct device *dev)
3004 struct mmc_blk_data *part_md;
3005 struct mmc_blk_data *md = dev_get_drvdata(dev);
3009 * Resume involves the card going into idle state,
3010 * so current partition is always the main one.
3012 md->part_curr = md->part_type;
3013 mmc_queue_resume(&md->queue);
3014 list_for_each_entry(part_md, &md->part, part) {
3015 mmc_queue_resume(&part_md->queue);
3022 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
3024 static struct mmc_driver mmc_driver = {
3027 .pm = &mmc_blk_pm_ops,
3029 .probe = mmc_blk_probe,
3030 .remove = mmc_blk_remove,
3031 .shutdown = mmc_blk_shutdown,
3034 static int __init mmc_blk_init(void)
3038 res = bus_register(&mmc_rpmb_bus_type);
3040 pr_err("mmcblk: could not register RPMB bus type\n");
3043 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3045 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3049 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3050 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3052 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3054 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3056 goto out_chrdev_unreg;
3058 res = mmc_register_driver(&mmc_driver);
3060 goto out_blkdev_unreg;
3065 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3067 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3069 bus_unregister(&mmc_rpmb_bus_type);
3073 static void __exit mmc_blk_exit(void)
3075 mmc_unregister_driver(&mmc_driver);
3076 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3077 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3078 bus_unregister(&mmc_rpmb_bus_type);
3081 module_init(mmc_blk_init);
3082 module_exit(mmc_blk_exit);
3084 MODULE_LICENSE("GPL");
3085 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");