1 // SPDX-License-Identifier: GPL-2.0
3 * Block driver for media (i.e., flash cards)
5 * Copyright 2002 Hewlett-Packard Company
6 * Copyright 2005-2008 Pierre Ossman
8 * Use consistent with the GNU GPL is permitted,
9 * provided that this copyright notice is
10 * preserved in its entirety in all copies and derived works.
12 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
13 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
14 * FITNESS FOR ANY PARTICULAR PURPOSE.
16 * Many thanks to Alessandro Rubini and Jonathan Corbet!
18 * Author: Andrew Christian
21 #include <linux/moduleparam.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
25 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/errno.h>
29 #include <linux/hdreg.h>
30 #include <linux/kdev_t.h>
31 #include <linux/kref.h>
32 #include <linux/blkdev.h>
33 #include <linux/cdev.h>
34 #include <linux/mutex.h>
35 #include <linux/scatterlist.h>
36 #include <linux/string_helpers.h>
37 #include <linux/delay.h>
38 #include <linux/capability.h>
39 #include <linux/compat.h>
40 #include <linux/pm_runtime.h>
41 #include <linux/idr.h>
42 #include <linux/debugfs.h>
44 #include <linux/mmc/ioctl.h>
45 #include <linux/mmc/card.h>
46 #include <linux/mmc/host.h>
47 #include <linux/mmc/mmc.h>
48 #include <linux/mmc/sd.h>
50 #include <linux/uaccess.h>
63 MODULE_ALIAS("mmc:block");
64 #ifdef MODULE_PARAM_PREFIX
65 #undef MODULE_PARAM_PREFIX
67 #define MODULE_PARAM_PREFIX "mmcblk."
70 * Set a 10 second timeout for polling write request busy state. Note, mmc core
71 * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
72 * second software timer to timeout the whole request, so 10 seconds should be
75 #define MMC_BLK_TIMEOUT_MS (10 * 1000)
76 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
77 #define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
79 #define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
80 (rq_data_dir(req) == WRITE))
81 static DEFINE_MUTEX(block_mutex);
84 * The defaults come from config options but can be overriden by module
87 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
90 * We've only got one major, so number of mmcblk devices is
91 * limited to (1 << 20) / number of minors per device. It is also
92 * limited by the MAX_DEVICES below.
94 static int max_devices;
96 #define MAX_DEVICES 256
98 static DEFINE_IDA(mmc_blk_ida);
99 static DEFINE_IDA(mmc_rpmb_ida);
102 * There is one mmc_blk_data per slot.
104 struct mmc_blk_data {
105 struct device *parent;
106 struct gendisk *disk;
107 struct mmc_queue queue;
108 struct list_head part;
109 struct list_head rpmbs;
112 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
113 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
116 unsigned int read_only;
117 unsigned int part_type;
118 unsigned int reset_done;
119 #define MMC_BLK_READ BIT(0)
120 #define MMC_BLK_WRITE BIT(1)
121 #define MMC_BLK_DISCARD BIT(2)
122 #define MMC_BLK_SECDISCARD BIT(3)
123 #define MMC_BLK_CQE_RECOVERY BIT(4)
126 * Only set in main mmc_blk_data associated
127 * with mmc_card with dev_set_drvdata, and keeps
128 * track of the current selected device partition.
130 unsigned int part_curr;
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);
171 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
172 struct mmc_card *card,
174 struct mmc_queue *mq);
175 static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
177 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
179 struct mmc_blk_data *md;
181 mutex_lock(&open_lock);
182 md = disk->private_data;
183 if (md && !kref_get_unless_zero(&md->kref))
185 mutex_unlock(&open_lock);
190 static inline int mmc_get_devidx(struct gendisk *disk)
192 int devidx = disk->first_minor / perdev_minors;
196 static void mmc_blk_kref_release(struct kref *ref)
198 struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref);
201 devidx = mmc_get_devidx(md->disk);
202 ida_simple_remove(&mmc_blk_ida, devidx);
204 mutex_lock(&open_lock);
205 md->disk->private_data = NULL;
206 mutex_unlock(&open_lock);
212 static void mmc_blk_put(struct mmc_blk_data *md)
214 kref_put(&md->kref, mmc_blk_kref_release);
217 static ssize_t power_ro_lock_show(struct device *dev,
218 struct device_attribute *attr, char *buf)
221 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
222 struct mmc_card *card = md->queue.card;
225 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
227 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
230 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
237 static ssize_t power_ro_lock_store(struct device *dev,
238 struct device_attribute *attr, const char *buf, size_t count)
241 struct mmc_blk_data *md, *part_md;
242 struct mmc_queue *mq;
246 if (kstrtoul(buf, 0, &set))
252 md = mmc_blk_get(dev_to_disk(dev));
255 /* Dispatch locking to the block layer */
256 req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, 0);
258 count = PTR_ERR(req);
261 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
262 blk_execute_rq(NULL, req, 0);
263 ret = req_to_mmc_queue_req(req)->drv_op_result;
264 blk_put_request(req);
267 pr_info("%s: Locking boot partition ro until next power on\n",
268 md->disk->disk_name);
269 set_disk_ro(md->disk, 1);
271 list_for_each_entry(part_md, &md->part, part)
272 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
273 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
274 set_disk_ro(part_md->disk, 1);
282 static DEVICE_ATTR(ro_lock_until_next_power_on, 0,
283 power_ro_lock_show, power_ro_lock_store);
285 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
289 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
291 ret = snprintf(buf, PAGE_SIZE, "%d\n",
292 get_disk_ro(dev_to_disk(dev)) ^
298 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
299 const char *buf, size_t count)
303 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
304 unsigned long set = simple_strtoul(buf, &end, 0);
310 set_disk_ro(dev_to_disk(dev), set || md->read_only);
317 static DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store);
319 static struct attribute *mmc_disk_attrs[] = {
320 &dev_attr_force_ro.attr,
321 &dev_attr_ro_lock_until_next_power_on.attr,
325 static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj,
326 struct attribute *a, int n)
328 struct device *dev = container_of(kobj, struct device, kobj);
329 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
330 umode_t mode = a->mode;
332 if (a == &dev_attr_ro_lock_until_next_power_on.attr &&
333 (md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
334 md->queue.card->ext_csd.boot_ro_lockable) {
336 if (!(md->queue.card->ext_csd.boot_ro_lock &
337 EXT_CSD_BOOT_WP_B_PWR_WP_DIS))
345 static const struct attribute_group mmc_disk_attr_group = {
346 .is_visible = mmc_disk_attrs_is_visible,
347 .attrs = mmc_disk_attrs,
350 static const struct attribute_group *mmc_disk_attr_groups[] = {
351 &mmc_disk_attr_group,
355 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
357 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
360 mutex_lock(&block_mutex);
363 if ((mode & FMODE_WRITE) && md->read_only) {
368 mutex_unlock(&block_mutex);
373 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
375 struct mmc_blk_data *md = disk->private_data;
377 mutex_lock(&block_mutex);
379 mutex_unlock(&block_mutex);
383 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
385 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
391 struct mmc_blk_ioc_data {
392 struct mmc_ioc_cmd ic;
395 struct mmc_rpmb_data *rpmb;
398 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
399 struct mmc_ioc_cmd __user *user)
401 struct mmc_blk_ioc_data *idata;
404 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
410 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
415 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
416 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
421 if (!idata->buf_bytes) {
426 idata->buf = memdup_user((void __user *)(unsigned long)
427 idata->ic.data_ptr, idata->buf_bytes);
428 if (IS_ERR(idata->buf)) {
429 err = PTR_ERR(idata->buf);
441 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
442 struct mmc_blk_ioc_data *idata)
444 struct mmc_ioc_cmd *ic = &idata->ic;
446 if (copy_to_user(&(ic_ptr->response), ic->response,
447 sizeof(ic->response)))
450 if (!idata->ic.write_flag) {
451 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
452 idata->buf, idata->buf_bytes))
459 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
462 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
467 bool done = time_after(jiffies, timeout);
469 err = __mmc_send_status(card, &status, 5);
471 dev_err(mmc_dev(card->host),
472 "error %d requesting status\n", err);
476 /* Accumulate any response error bits seen */
478 *resp_errs |= status;
481 * Timeout if the device never becomes ready for data and never
482 * leaves the program state.
485 dev_err(mmc_dev(card->host),
486 "Card stuck in wrong state! %s status: %#x\n",
490 } while (!mmc_ready_for_data(status));
495 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
496 struct mmc_blk_ioc_data *idata)
498 struct mmc_command cmd = {}, sbc = {};
499 struct mmc_data data = {};
500 struct mmc_request mrq = {};
501 struct scatterlist sg;
503 unsigned int target_part;
505 if (!card || !md || !idata)
509 * The RPMB accesses comes in from the character device, so we
510 * need to target these explicitly. Else we just target the
511 * partition type for the block device the ioctl() was issued
515 /* Support multiple RPMB partitions */
516 target_part = idata->rpmb->part_index;
517 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
519 target_part = md->part_type;
522 cmd.opcode = idata->ic.opcode;
523 cmd.arg = idata->ic.arg;
524 cmd.flags = idata->ic.flags;
526 if (idata->buf_bytes) {
529 data.blksz = idata->ic.blksz;
530 data.blocks = idata->ic.blocks;
532 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
534 if (idata->ic.write_flag)
535 data.flags = MMC_DATA_WRITE;
537 data.flags = MMC_DATA_READ;
539 /* data.flags must already be set before doing this. */
540 mmc_set_data_timeout(&data, card);
542 /* Allow overriding the timeout_ns for empirical tuning. */
543 if (idata->ic.data_timeout_ns)
544 data.timeout_ns = idata->ic.data_timeout_ns;
546 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
548 * Pretend this is a data transfer and rely on the
549 * host driver to compute timeout. When all host
550 * drivers support cmd.cmd_timeout for R1B, this
554 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
556 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
564 err = mmc_blk_part_switch(card, target_part);
568 if (idata->ic.is_acmd) {
569 err = mmc_app_cmd(card->host, card);
575 sbc.opcode = MMC_SET_BLOCK_COUNT;
577 * We don't do any blockcount validation because the max size
578 * may be increased by a future standard. We just copy the
579 * 'Reliable Write' bit here.
581 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
582 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
586 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
587 (cmd.opcode == MMC_SWITCH))
588 return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
590 mmc_wait_for_req(card->host, &mrq);
593 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
594 __func__, cmd.error);
598 dev_err(mmc_dev(card->host), "%s: data error %d\n",
599 __func__, data.error);
604 * Make sure the cache of the PARTITION_CONFIG register and
605 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
606 * changed it successfully.
608 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
609 (cmd.opcode == MMC_SWITCH)) {
610 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
611 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
614 * Update cache so the next mmc_blk_part_switch call operates
615 * on up-to-date data.
617 card->ext_csd.part_config = value;
618 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
622 * Make sure to update CACHE_CTRL in case it was changed. The cache
623 * will get turned back on if the card is re-initialized, e.g.
624 * suspend/resume or hw reset in recovery.
626 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
627 (cmd.opcode == MMC_SWITCH)) {
628 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
630 card->ext_csd.cache_ctrl = value;
634 * According to the SD specs, some commands require a delay after
635 * issuing the command.
637 if (idata->ic.postsleep_min_us)
638 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
640 memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
642 if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
644 * Ensure RPMB/R1B command has completed by polling CMD13
647 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL);
653 static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
654 struct mmc_ioc_cmd __user *ic_ptr,
655 struct mmc_rpmb_data *rpmb)
657 struct mmc_blk_ioc_data *idata;
658 struct mmc_blk_ioc_data *idatas[1];
659 struct mmc_queue *mq;
660 struct mmc_card *card;
661 int err = 0, ioc_err = 0;
664 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
666 return PTR_ERR(idata);
667 /* This will be NULL on non-RPMB ioctl():s */
670 card = md->queue.card;
677 * Dispatch the ioctl() into the block request queue.
680 req = blk_get_request(mq->queue,
681 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
687 req_to_mmc_queue_req(req)->drv_op =
688 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
689 req_to_mmc_queue_req(req)->drv_op_data = idatas;
690 req_to_mmc_queue_req(req)->ioc_count = 1;
691 blk_execute_rq(NULL, req, 0);
692 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
693 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
694 blk_put_request(req);
699 return ioc_err ? ioc_err : err;
702 static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
703 struct mmc_ioc_multi_cmd __user *user,
704 struct mmc_rpmb_data *rpmb)
706 struct mmc_blk_ioc_data **idata = NULL;
707 struct mmc_ioc_cmd __user *cmds = user->cmds;
708 struct mmc_card *card;
709 struct mmc_queue *mq;
710 int i, err = 0, ioc_err = 0;
714 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
715 sizeof(num_of_cmds)))
721 if (num_of_cmds > MMC_IOC_MAX_CMDS)
724 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
728 for (i = 0; i < num_of_cmds; i++) {
729 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
730 if (IS_ERR(idata[i])) {
731 err = PTR_ERR(idata[i]);
735 /* This will be NULL on non-RPMB ioctl():s */
736 idata[i]->rpmb = rpmb;
739 card = md->queue.card;
747 * Dispatch the ioctl()s into the block request queue.
750 req = blk_get_request(mq->queue,
751 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
756 req_to_mmc_queue_req(req)->drv_op =
757 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
758 req_to_mmc_queue_req(req)->drv_op_data = idata;
759 req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
760 blk_execute_rq(NULL, req, 0);
761 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
763 /* copy to user if data and response */
764 for (i = 0; i < num_of_cmds && !err; i++)
765 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
767 blk_put_request(req);
770 for (i = 0; i < num_of_cmds; i++) {
771 kfree(idata[i]->buf);
775 return ioc_err ? ioc_err : err;
778 static int mmc_blk_check_blkdev(struct block_device *bdev)
781 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
782 * whole block device, not on a partition. This prevents overspray
783 * between sibling partitions.
785 if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
790 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
791 unsigned int cmd, unsigned long arg)
793 struct mmc_blk_data *md;
798 ret = mmc_blk_check_blkdev(bdev);
801 md = mmc_blk_get(bdev->bd_disk);
804 ret = mmc_blk_ioctl_cmd(md,
805 (struct mmc_ioc_cmd __user *)arg,
809 case MMC_IOC_MULTI_CMD:
810 ret = mmc_blk_check_blkdev(bdev);
813 md = mmc_blk_get(bdev->bd_disk);
816 ret = mmc_blk_ioctl_multi_cmd(md,
817 (struct mmc_ioc_multi_cmd __user *)arg,
827 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
828 unsigned int cmd, unsigned long arg)
830 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
834 static const struct block_device_operations mmc_bdops = {
835 .open = mmc_blk_open,
836 .release = mmc_blk_release,
837 .getgeo = mmc_blk_getgeo,
838 .owner = THIS_MODULE,
839 .ioctl = mmc_blk_ioctl,
841 .compat_ioctl = mmc_blk_compat_ioctl,
845 static int mmc_blk_part_switch_pre(struct mmc_card *card,
846 unsigned int part_type)
850 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
851 if (card->ext_csd.cmdq_en) {
852 ret = mmc_cmdq_disable(card);
856 mmc_retune_pause(card->host);
862 static int mmc_blk_part_switch_post(struct mmc_card *card,
863 unsigned int part_type)
867 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
868 mmc_retune_unpause(card->host);
869 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
870 ret = mmc_cmdq_enable(card);
876 static inline int mmc_blk_part_switch(struct mmc_card *card,
877 unsigned int part_type)
880 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
882 if (main_md->part_curr == part_type)
885 if (mmc_card_mmc(card)) {
886 u8 part_config = card->ext_csd.part_config;
888 ret = mmc_blk_part_switch_pre(card, part_type);
892 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
893 part_config |= part_type;
895 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
896 EXT_CSD_PART_CONFIG, part_config,
897 card->ext_csd.part_time);
899 mmc_blk_part_switch_post(card, part_type);
903 card->ext_csd.part_config = part_config;
905 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
908 main_md->part_curr = part_type;
912 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
918 struct mmc_request mrq = {};
919 struct mmc_command cmd = {};
920 struct mmc_data data = {};
922 struct scatterlist sg;
924 cmd.opcode = MMC_APP_CMD;
925 cmd.arg = card->rca << 16;
926 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
928 err = mmc_wait_for_cmd(card->host, &cmd, 0);
931 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
934 memset(&cmd, 0, sizeof(struct mmc_command));
936 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
938 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
942 data.flags = MMC_DATA_READ;
945 mmc_set_data_timeout(&data, card);
950 blocks = kmalloc(4, GFP_KERNEL);
954 sg_init_one(&sg, blocks, 4);
956 mmc_wait_for_req(card->host, &mrq);
958 result = ntohl(*blocks);
961 if (cmd.error || data.error)
964 *written_blocks = result;
969 static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
971 if (host->actual_clock)
972 return host->actual_clock / 1000;
974 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
976 return host->ios.clock / 2000;
978 /* How can there be no clock */
980 return 100; /* 100 kHz is minimum possible value */
983 static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
984 struct mmc_data *data)
986 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
989 if (data->timeout_clks) {
990 khz = mmc_blk_clock_khz(host);
991 ms += DIV_ROUND_UP(data->timeout_clks, khz);
997 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1002 if (md->reset_done & type)
1005 md->reset_done |= type;
1006 err = mmc_hw_reset(host);
1007 /* Ensure we switch back to the correct partition */
1009 struct mmc_blk_data *main_md =
1010 dev_get_drvdata(&host->card->dev);
1013 main_md->part_curr = main_md->part_type;
1014 part_err = mmc_blk_part_switch(host->card, md->part_type);
1017 * We have failed to get back into the correct
1018 * partition, so we need to abort the whole request.
1026 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1028 md->reset_done &= ~type;
1032 * The non-block commands come back from the block layer after it queued it and
1033 * processed it with all other requests and then they get issued in this
1036 static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1038 struct mmc_queue_req *mq_rq;
1039 struct mmc_card *card = mq->card;
1040 struct mmc_blk_data *md = mq->blkdata;
1041 struct mmc_blk_ioc_data **idata;
1048 mq_rq = req_to_mmc_queue_req(req);
1049 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
1051 switch (mq_rq->drv_op) {
1052 case MMC_DRV_OP_IOCTL:
1053 if (card->ext_csd.cmdq_en) {
1054 ret = mmc_cmdq_disable(card);
1059 case MMC_DRV_OP_IOCTL_RPMB:
1060 idata = mq_rq->drv_op_data;
1061 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1062 ret = __mmc_blk_ioctl_cmd(card, md, idata[i]);
1066 /* Always switch back to main area after RPMB access */
1068 mmc_blk_part_switch(card, 0);
1069 else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
1070 mmc_cmdq_enable(card);
1072 case MMC_DRV_OP_BOOT_WP:
1073 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1074 card->ext_csd.boot_ro_lock |
1075 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1076 card->ext_csd.part_time);
1078 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1079 md->disk->disk_name, ret);
1081 card->ext_csd.boot_ro_lock |=
1082 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1084 case MMC_DRV_OP_GET_CARD_STATUS:
1085 ret = mmc_send_status(card, &status);
1089 case MMC_DRV_OP_GET_EXT_CSD:
1090 ext_csd = mq_rq->drv_op_data;
1091 ret = mmc_get_ext_csd(card, ext_csd);
1094 pr_err("%s: unknown driver specific operation\n",
1095 md->disk->disk_name);
1099 mq_rq->drv_op_result = ret;
1100 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1103 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1105 struct mmc_blk_data *md = mq->blkdata;
1106 struct mmc_card *card = md->queue.card;
1107 unsigned int from, nr;
1108 int err = 0, type = MMC_BLK_DISCARD;
1109 blk_status_t status = BLK_STS_OK;
1111 if (!mmc_can_erase(card)) {
1112 status = BLK_STS_NOTSUPP;
1116 from = blk_rq_pos(req);
1117 nr = blk_rq_sectors(req);
1121 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1122 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1123 INAND_CMD38_ARG_EXT_CSD,
1124 card->erase_arg == MMC_TRIM_ARG ?
1125 INAND_CMD38_ARG_TRIM :
1126 INAND_CMD38_ARG_ERASE,
1127 card->ext_csd.generic_cmd6_time);
1130 err = mmc_erase(card, from, nr, card->erase_arg);
1131 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1133 status = BLK_STS_IOERR;
1135 mmc_blk_reset_success(md, type);
1137 blk_mq_end_request(req, status);
1140 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1141 struct request *req)
1143 struct mmc_blk_data *md = mq->blkdata;
1144 struct mmc_card *card = md->queue.card;
1145 unsigned int from, nr, arg;
1146 int err = 0, type = MMC_BLK_SECDISCARD;
1147 blk_status_t status = BLK_STS_OK;
1149 if (!(mmc_can_secure_erase_trim(card))) {
1150 status = BLK_STS_NOTSUPP;
1154 from = blk_rq_pos(req);
1155 nr = blk_rq_sectors(req);
1157 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1158 arg = MMC_SECURE_TRIM1_ARG;
1160 arg = MMC_SECURE_ERASE_ARG;
1163 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1164 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1165 INAND_CMD38_ARG_EXT_CSD,
1166 arg == MMC_SECURE_TRIM1_ARG ?
1167 INAND_CMD38_ARG_SECTRIM1 :
1168 INAND_CMD38_ARG_SECERASE,
1169 card->ext_csd.generic_cmd6_time);
1174 err = mmc_erase(card, from, nr, arg);
1178 status = BLK_STS_IOERR;
1182 if (arg == MMC_SECURE_TRIM1_ARG) {
1183 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1184 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1185 INAND_CMD38_ARG_EXT_CSD,
1186 INAND_CMD38_ARG_SECTRIM2,
1187 card->ext_csd.generic_cmd6_time);
1192 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1196 status = BLK_STS_IOERR;
1202 if (err && !mmc_blk_reset(md, card->host, type))
1205 mmc_blk_reset_success(md, type);
1207 blk_mq_end_request(req, status);
1210 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1212 struct mmc_blk_data *md = mq->blkdata;
1213 struct mmc_card *card = md->queue.card;
1216 ret = mmc_flush_cache(card->host);
1217 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1221 * Reformat current write as a reliable write, supporting
1222 * both legacy and the enhanced reliable write MMC cards.
1223 * In each transfer we'll handle only as much as a single
1224 * reliable write can handle, thus finish the request in
1225 * partial completions.
1227 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1228 struct mmc_card *card,
1229 struct request *req)
1231 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1232 /* Legacy mode imposes restrictions on transfers. */
1233 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1234 brq->data.blocks = 1;
1236 if (brq->data.blocks > card->ext_csd.rel_sectors)
1237 brq->data.blocks = card->ext_csd.rel_sectors;
1238 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1239 brq->data.blocks = 1;
1243 #define CMD_ERRORS_EXCL_OOR \
1244 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1245 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1246 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1247 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1248 R1_CC_ERROR | /* Card controller error */ \
1249 R1_ERROR) /* General/unknown error */
1251 #define CMD_ERRORS \
1252 (CMD_ERRORS_EXCL_OOR | \
1253 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1255 static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1260 * Per the SD specification(physical layer version 4.10)[1],
1261 * section 4.3.3, it explicitly states that "When the last
1262 * block of user area is read using CMD18, the host should
1263 * ignore OUT_OF_RANGE error that may occur even the sequence
1264 * is correct". And JESD84-B51 for eMMC also has a similar
1265 * statement on section 6.8.3.
1267 * Multiple block read/write could be done by either predefined
1268 * method, namely CMD23, or open-ending mode. For open-ending mode,
1269 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1271 * However the spec[1] doesn't tell us whether we should also
1272 * ignore that for predefined method. But per the spec[1], section
1273 * 4.15 Set Block Count Command, it says"If illegal block count
1274 * is set, out of range error will be indicated during read/write
1275 * operation (For example, data transfer is stopped at user area
1276 * boundary)." In another word, we could expect a out of range error
1277 * in the response for the following CMD18/25. And if argument of
1278 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1279 * we could also expect to get a -ETIMEDOUT or any error number from
1280 * the host drivers due to missing data response(for write)/data(for
1281 * read), as the cards will stop the data transfer by itself per the
1282 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1285 if (!brq->stop.error) {
1286 bool oor_with_open_end;
1287 /* If there is no error yet, check R1 response */
1289 val = brq->stop.resp[0] & CMD_ERRORS;
1290 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1292 if (val && !oor_with_open_end)
1293 brq->stop.error = -EIO;
1297 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1298 int disable_multi, bool *do_rel_wr_p,
1299 bool *do_data_tag_p)
1301 struct mmc_blk_data *md = mq->blkdata;
1302 struct mmc_card *card = md->queue.card;
1303 struct mmc_blk_request *brq = &mqrq->brq;
1304 struct request *req = mmc_queue_req_to_req(mqrq);
1305 bool do_rel_wr, do_data_tag;
1308 * Reliable writes are used to implement Forced Unit Access and
1309 * are supported only on MMCs.
1311 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1312 rq_data_dir(req) == WRITE &&
1313 (md->flags & MMC_BLK_REL_WR);
1315 memset(brq, 0, sizeof(struct mmc_blk_request));
1317 mmc_crypto_prepare_req(mqrq);
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);
1496 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1498 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1501 static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1503 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1505 struct request *req = mmc_queue_req_to_req(mqrq);
1506 struct request_queue *q = req->q;
1507 struct mmc_queue *mq = q->queuedata;
1510 * Block layer timeouts race with completions which means the normal
1511 * completion path cannot be used during recovery.
1513 if (mq->in_recovery)
1514 mmc_blk_cqe_complete_rq(mq, req);
1515 else if (likely(!blk_should_fake_timeout(req->q)))
1516 blk_mq_complete_request(req);
1519 static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1521 mrq->done = mmc_blk_cqe_req_done;
1522 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1524 return mmc_cqe_start_req(host, mrq);
1527 static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1528 struct request *req)
1530 struct mmc_blk_request *brq = &mqrq->brq;
1532 memset(brq, 0, sizeof(*brq));
1534 brq->mrq.cmd = &brq->cmd;
1535 brq->mrq.tag = req->tag;
1540 static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1542 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1543 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1545 mrq->cmd->opcode = MMC_SWITCH;
1546 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1547 (EXT_CSD_FLUSH_CACHE << 16) |
1549 EXT_CSD_CMD_SET_NORMAL;
1550 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1552 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1555 static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1557 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1558 struct mmc_host *host = mq->card->host;
1561 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1562 mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
1563 mmc_pre_req(host, &mqrq->brq.mrq);
1565 err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
1567 mmc_post_req(host, &mqrq->brq.mrq, err);
1572 static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1574 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1575 struct mmc_host *host = mq->card->host;
1577 if (host->hsq_enabled)
1578 return mmc_blk_hsq_issue_rw_rq(mq, req);
1580 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1582 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1585 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1586 struct mmc_card *card,
1588 struct mmc_queue *mq)
1590 u32 readcmd, writecmd;
1591 struct mmc_blk_request *brq = &mqrq->brq;
1592 struct request *req = mmc_queue_req_to_req(mqrq);
1593 struct mmc_blk_data *md = mq->blkdata;
1594 bool do_rel_wr, do_data_tag;
1596 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1598 brq->mrq.cmd = &brq->cmd;
1600 brq->cmd.arg = blk_rq_pos(req);
1601 if (!mmc_card_blockaddr(card))
1603 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1605 if (brq->data.blocks > 1 || do_rel_wr) {
1606 /* SPI multiblock writes terminate using a special
1607 * token, not a STOP_TRANSMISSION request.
1609 if (!mmc_host_is_spi(card->host) ||
1610 rq_data_dir(req) == READ)
1611 brq->mrq.stop = &brq->stop;
1612 readcmd = MMC_READ_MULTIPLE_BLOCK;
1613 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1615 brq->mrq.stop = NULL;
1616 readcmd = MMC_READ_SINGLE_BLOCK;
1617 writecmd = MMC_WRITE_BLOCK;
1619 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1622 * Pre-defined multi-block transfers are preferable to
1623 * open ended-ones (and necessary for reliable writes).
1624 * However, it is not sufficient to just send CMD23,
1625 * and avoid the final CMD12, as on an error condition
1626 * CMD12 (stop) needs to be sent anyway. This, coupled
1627 * with Auto-CMD23 enhancements provided by some
1628 * hosts, means that the complexity of dealing
1629 * with this is best left to the host. If CMD23 is
1630 * supported by card and host, we'll fill sbc in and let
1631 * the host deal with handling it correctly. This means
1632 * that for hosts that don't expose MMC_CAP_CMD23, no
1633 * change of behavior will be observed.
1635 * N.B: Some MMC cards experience perf degradation.
1636 * We'll avoid using CMD23-bounded multiblock writes for
1637 * these, while retaining features like reliable writes.
1639 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1640 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1642 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1643 brq->sbc.arg = brq->data.blocks |
1644 (do_rel_wr ? (1 << 31) : 0) |
1645 (do_data_tag ? (1 << 29) : 0);
1646 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1647 brq->mrq.sbc = &brq->sbc;
1651 #define MMC_MAX_RETRIES 5
1652 #define MMC_DATA_RETRIES 2
1653 #define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1655 static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1657 struct mmc_command cmd = {
1658 .opcode = MMC_STOP_TRANSMISSION,
1659 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1660 /* Some hosts wait for busy anyway, so provide a busy timeout */
1661 .busy_timeout = timeout,
1664 return mmc_wait_for_cmd(card->host, &cmd, 5);
1667 static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1669 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1670 struct mmc_blk_request *brq = &mqrq->brq;
1671 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1674 mmc_retune_hold_now(card->host);
1676 mmc_blk_send_stop(card, timeout);
1678 err = card_busy_detect(card, timeout, NULL);
1680 mmc_retune_release(card->host);
1685 #define MMC_READ_SINGLE_RETRIES 2
1687 /* Single sector read during recovery */
1688 static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1690 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1691 struct mmc_request *mrq = &mqrq->brq.mrq;
1692 struct mmc_card *card = mq->card;
1693 struct mmc_host *host = card->host;
1694 blk_status_t error = BLK_STS_OK;
1701 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1703 mmc_wait_for_req(host, mrq);
1705 err = mmc_send_status(card, &status);
1709 if (!mmc_host_is_spi(host) &&
1710 !mmc_ready_for_data(status)) {
1711 err = mmc_blk_fix_state(card, req);
1716 if (mrq->cmd->error && retries++ < MMC_READ_SINGLE_RETRIES)
1721 if (mrq->cmd->error ||
1723 (!mmc_host_is_spi(host) &&
1724 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1725 error = BLK_STS_IOERR;
1729 } while (blk_update_request(req, error, 512));
1734 mrq->data->bytes_xfered = 0;
1735 blk_update_request(req, BLK_STS_IOERR, 512);
1736 /* Let it try the remaining request again */
1737 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1738 mqrq->retries = MMC_MAX_RETRIES - 1;
1741 static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1743 return !!brq->mrq.sbc;
1746 static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1748 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1752 * Check for errors the host controller driver might not have seen such as
1753 * response mode errors or invalid card state.
1755 static bool mmc_blk_status_error(struct request *req, u32 status)
1757 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1758 struct mmc_blk_request *brq = &mqrq->brq;
1759 struct mmc_queue *mq = req->q->queuedata;
1762 if (mmc_host_is_spi(mq->card->host))
1765 stop_err_bits = mmc_blk_stop_err_bits(brq);
1767 return brq->cmd.resp[0] & CMD_ERRORS ||
1768 brq->stop.resp[0] & stop_err_bits ||
1769 status & stop_err_bits ||
1770 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
1773 static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1775 return !brq->sbc.error && !brq->cmd.error &&
1776 !(brq->cmd.resp[0] & CMD_ERRORS);
1780 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1782 * 1. A request that has transferred at least some data is considered
1783 * successful and will be requeued if there is remaining data to
1785 * 2. Otherwise the number of retries is incremented and the request
1786 * will be requeued if there are remaining retries.
1787 * 3. Otherwise the request will be errored out.
1788 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1789 * mqrq->retries. So there are only 4 possible actions here:
1790 * 1. do not accept the bytes_xfered value i.e. set it to zero
1791 * 2. change mqrq->retries to determine the number of retries
1792 * 3. try to reset the card
1793 * 4. read one sector at a time
1795 static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1797 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1798 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1799 struct mmc_blk_request *brq = &mqrq->brq;
1800 struct mmc_blk_data *md = mq->blkdata;
1801 struct mmc_card *card = mq->card;
1807 * Some errors the host driver might not have seen. Set the number of
1808 * bytes transferred to zero in that case.
1810 err = __mmc_send_status(card, &status, 0);
1811 if (err || mmc_blk_status_error(req, status))
1812 brq->data.bytes_xfered = 0;
1814 mmc_retune_release(card->host);
1817 * Try again to get the status. This also provides an opportunity for
1821 err = __mmc_send_status(card, &status, 0);
1824 * Nothing more to do after the number of bytes transferred has been
1825 * updated and there is no card.
1827 if (err && mmc_detect_card_removed(card->host))
1830 /* Try to get back to "tran" state */
1831 if (!mmc_host_is_spi(mq->card->host) &&
1832 (err || !mmc_ready_for_data(status)))
1833 err = mmc_blk_fix_state(mq->card, req);
1836 * Special case for SD cards where the card might record the number of
1839 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1840 rq_data_dir(req) == WRITE) {
1841 if (mmc_sd_num_wr_blocks(card, &blocks))
1842 brq->data.bytes_xfered = 0;
1844 brq->data.bytes_xfered = blocks << 9;
1847 /* Reset if the card is in a bad state */
1848 if (!mmc_host_is_spi(mq->card->host) &&
1849 err && mmc_blk_reset(md, card->host, type)) {
1850 pr_err("%s: recovery failed!\n", req->rq_disk->disk_name);
1851 mqrq->retries = MMC_NO_RETRIES;
1856 * If anything was done, just return and if there is anything remaining
1857 * on the request it will get requeued.
1859 if (brq->data.bytes_xfered)
1862 /* Reset before last retry */
1863 if (mqrq->retries + 1 == MMC_MAX_RETRIES)
1864 mmc_blk_reset(md, card->host, type);
1866 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
1867 if (brq->sbc.error || brq->cmd.error)
1870 /* Reduce the remaining retries for data errors */
1871 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
1872 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
1876 /* FIXME: Missing single sector read for large sector size */
1877 if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
1878 brq->data.blocks > 1) {
1879 /* Read one sector at a time */
1880 mmc_blk_read_single(mq, req);
1885 static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
1887 mmc_blk_eval_resp_error(brq);
1889 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
1890 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
1893 static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
1895 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1899 if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ)
1902 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status);
1905 * Do not assume data transferred correctly if there are any error bits
1908 if (status & mmc_blk_stop_err_bits(&mqrq->brq)) {
1909 mqrq->brq.data.bytes_xfered = 0;
1910 err = err ? err : -EIO;
1913 /* Copy the exception bit so it will be seen later on */
1914 if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT)
1915 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
1920 static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
1921 struct request *req)
1923 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1925 mmc_blk_reset_success(mq->blkdata, type);
1928 static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
1930 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1931 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
1934 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
1935 blk_mq_requeue_request(req, true);
1937 __blk_mq_end_request(req, BLK_STS_OK);
1938 } else if (!blk_rq_bytes(req)) {
1939 __blk_mq_end_request(req, BLK_STS_IOERR);
1940 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
1941 blk_mq_requeue_request(req, true);
1943 if (mmc_card_removed(mq->card))
1944 req->rq_flags |= RQF_QUIET;
1945 blk_mq_end_request(req, BLK_STS_IOERR);
1949 static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
1950 struct mmc_queue_req *mqrq)
1952 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
1953 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
1954 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
1957 static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
1958 struct mmc_queue_req *mqrq)
1960 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
1961 mmc_run_bkops(mq->card);
1964 static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
1966 struct mmc_queue_req *mqrq =
1967 container_of(mrq, struct mmc_queue_req, brq.mrq);
1968 struct request *req = mmc_queue_req_to_req(mqrq);
1969 struct request_queue *q = req->q;
1970 struct mmc_queue *mq = q->queuedata;
1971 struct mmc_host *host = mq->card->host;
1972 unsigned long flags;
1974 if (mmc_blk_rq_error(&mqrq->brq) ||
1975 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
1976 spin_lock_irqsave(&mq->lock, flags);
1977 mq->recovery_needed = true;
1978 mq->recovery_req = req;
1979 spin_unlock_irqrestore(&mq->lock, flags);
1981 host->cqe_ops->cqe_recovery_start(host);
1983 schedule_work(&mq->recovery_work);
1987 mmc_blk_rw_reset_success(mq, req);
1990 * Block layer timeouts race with completions which means the normal
1991 * completion path cannot be used during recovery.
1993 if (mq->in_recovery)
1994 mmc_blk_cqe_complete_rq(mq, req);
1995 else if (likely(!blk_should_fake_timeout(req->q)))
1996 blk_mq_complete_request(req);
1999 void mmc_blk_mq_complete(struct request *req)
2001 struct mmc_queue *mq = req->q->queuedata;
2002 struct mmc_host *host = mq->card->host;
2004 if (host->cqe_enabled)
2005 mmc_blk_cqe_complete_rq(mq, req);
2006 else if (likely(!blk_should_fake_timeout(req->q)))
2007 mmc_blk_mq_complete_rq(mq, req);
2010 static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
2011 struct request *req)
2013 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2014 struct mmc_host *host = mq->card->host;
2016 if (mmc_blk_rq_error(&mqrq->brq) ||
2017 mmc_blk_card_busy(mq->card, req)) {
2018 mmc_blk_mq_rw_recovery(mq, req);
2020 mmc_blk_rw_reset_success(mq, req);
2021 mmc_retune_release(host);
2024 mmc_blk_urgent_bkops(mq, mqrq);
2027 static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
2029 unsigned long flags;
2032 spin_lock_irqsave(&mq->lock, flags);
2034 mq->in_flight[mmc_issue_type(mq, req)] -= 1;
2036 put_card = (mmc_tot_in_flight(mq) == 0);
2038 spin_unlock_irqrestore(&mq->lock, flags);
2041 mmc_put_card(mq->card, &mq->ctx);
2044 static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req)
2046 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2047 struct mmc_request *mrq = &mqrq->brq.mrq;
2048 struct mmc_host *host = mq->card->host;
2050 mmc_post_req(host, mrq, 0);
2053 * Block layer timeouts race with completions which means the normal
2054 * completion path cannot be used during recovery.
2056 if (mq->in_recovery)
2057 mmc_blk_mq_complete_rq(mq, req);
2058 else if (likely(!blk_should_fake_timeout(req->q)))
2059 blk_mq_complete_request(req);
2061 mmc_blk_mq_dec_in_flight(mq, req);
2064 void mmc_blk_mq_recovery(struct mmc_queue *mq)
2066 struct request *req = mq->recovery_req;
2067 struct mmc_host *host = mq->card->host;
2068 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2070 mq->recovery_req = NULL;
2071 mq->rw_wait = false;
2073 if (mmc_blk_rq_error(&mqrq->brq)) {
2074 mmc_retune_hold_now(host);
2075 mmc_blk_mq_rw_recovery(mq, req);
2078 mmc_blk_urgent_bkops(mq, mqrq);
2080 mmc_blk_mq_post_req(mq, req);
2083 static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2084 struct request **prev_req)
2086 if (mmc_host_done_complete(mq->card->host))
2089 mutex_lock(&mq->complete_lock);
2091 if (!mq->complete_req)
2094 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2097 *prev_req = mq->complete_req;
2099 mmc_blk_mq_post_req(mq, mq->complete_req);
2101 mq->complete_req = NULL;
2104 mutex_unlock(&mq->complete_lock);
2107 void mmc_blk_mq_complete_work(struct work_struct *work)
2109 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2112 mmc_blk_mq_complete_prev_req(mq, NULL);
2115 static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2117 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2119 struct request *req = mmc_queue_req_to_req(mqrq);
2120 struct request_queue *q = req->q;
2121 struct mmc_queue *mq = q->queuedata;
2122 struct mmc_host *host = mq->card->host;
2123 unsigned long flags;
2125 if (!mmc_host_done_complete(host)) {
2129 * We cannot complete the request in this context, so record
2130 * that there is a request to complete, and that a following
2131 * request does not need to wait (although it does need to
2132 * complete complete_req first).
2134 spin_lock_irqsave(&mq->lock, flags);
2135 mq->complete_req = req;
2136 mq->rw_wait = false;
2137 waiting = mq->waiting;
2138 spin_unlock_irqrestore(&mq->lock, flags);
2141 * If 'waiting' then the waiting task will complete this
2142 * request, otherwise queue a work to do it. Note that
2143 * complete_work may still race with the dispatch of a following
2149 queue_work(mq->card->complete_wq, &mq->complete_work);
2154 /* Take the recovery path for errors or urgent background operations */
2155 if (mmc_blk_rq_error(&mqrq->brq) ||
2156 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2157 spin_lock_irqsave(&mq->lock, flags);
2158 mq->recovery_needed = true;
2159 mq->recovery_req = req;
2160 spin_unlock_irqrestore(&mq->lock, flags);
2162 schedule_work(&mq->recovery_work);
2166 mmc_blk_rw_reset_success(mq, req);
2168 mq->rw_wait = false;
2171 mmc_blk_mq_post_req(mq, req);
2174 static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2176 unsigned long flags;
2180 * Wait while there is another request in progress, but not if recovery
2181 * is needed. Also indicate whether there is a request waiting to start.
2183 spin_lock_irqsave(&mq->lock, flags);
2184 if (mq->recovery_needed) {
2188 done = !mq->rw_wait;
2190 mq->waiting = !done;
2191 spin_unlock_irqrestore(&mq->lock, flags);
2196 static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2200 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2202 /* Always complete the previous request if there is one */
2203 mmc_blk_mq_complete_prev_req(mq, prev_req);
2208 static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2209 struct request *req)
2211 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2212 struct mmc_host *host = mq->card->host;
2213 struct request *prev_req = NULL;
2216 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2218 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2220 mmc_pre_req(host, &mqrq->brq.mrq);
2222 err = mmc_blk_rw_wait(mq, &prev_req);
2228 err = mmc_start_request(host, &mqrq->brq.mrq);
2231 mmc_blk_mq_post_req(mq, prev_req);
2234 mq->rw_wait = false;
2236 /* Release re-tuning here where there is no synchronization required */
2237 if (err || mmc_host_done_complete(host))
2238 mmc_retune_release(host);
2242 mmc_post_req(host, &mqrq->brq.mrq, err);
2247 static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2249 if (host->cqe_enabled)
2250 return host->cqe_ops->cqe_wait_for_idle(host);
2252 return mmc_blk_rw_wait(mq, NULL);
2255 enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2257 struct mmc_blk_data *md = mq->blkdata;
2258 struct mmc_card *card = md->queue.card;
2259 struct mmc_host *host = card->host;
2262 ret = mmc_blk_part_switch(card, md->part_type);
2264 return MMC_REQ_FAILED_TO_START;
2266 switch (mmc_issue_type(mq, req)) {
2267 case MMC_ISSUE_SYNC:
2268 ret = mmc_blk_wait_for_idle(mq, host);
2270 return MMC_REQ_BUSY;
2271 switch (req_op(req)) {
2273 case REQ_OP_DRV_OUT:
2274 mmc_blk_issue_drv_op(mq, req);
2276 case REQ_OP_DISCARD:
2277 mmc_blk_issue_discard_rq(mq, req);
2279 case REQ_OP_SECURE_ERASE:
2280 mmc_blk_issue_secdiscard_rq(mq, req);
2283 mmc_blk_issue_flush(mq, req);
2287 return MMC_REQ_FAILED_TO_START;
2289 return MMC_REQ_FINISHED;
2290 case MMC_ISSUE_DCMD:
2291 case MMC_ISSUE_ASYNC:
2292 switch (req_op(req)) {
2294 if (!mmc_cache_enabled(host)) {
2295 blk_mq_end_request(req, BLK_STS_OK);
2296 return MMC_REQ_FINISHED;
2298 ret = mmc_blk_cqe_issue_flush(mq, req);
2302 if (host->cqe_enabled)
2303 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2305 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2312 return MMC_REQ_STARTED;
2313 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2316 return MMC_REQ_FAILED_TO_START;
2320 static inline int mmc_blk_readonly(struct mmc_card *card)
2322 return mmc_card_readonly(card) ||
2323 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2326 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2327 struct device *parent,
2330 const char *subname,
2332 unsigned int part_type)
2334 struct mmc_blk_data *md;
2338 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2341 * We get -ENOSPC because there are no more any available
2342 * devidx. The reason may be that, either userspace haven't yet
2343 * unmounted the partitions, which postpones mmc_blk_release()
2344 * from being called, or the device has more partitions than
2347 if (devidx == -ENOSPC)
2348 dev_err(mmc_dev(card->host),
2349 "no more device IDs available\n");
2351 return ERR_PTR(devidx);
2354 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2360 md->area_type = area_type;
2363 * Set the read-only status based on the supported commands
2364 * and the write protect switch.
2366 md->read_only = mmc_blk_readonly(card);
2368 md->disk = mmc_init_queue(&md->queue, card);
2369 if (IS_ERR(md->disk)) {
2370 ret = PTR_ERR(md->disk);
2374 INIT_LIST_HEAD(&md->part);
2375 INIT_LIST_HEAD(&md->rpmbs);
2376 kref_init(&md->kref);
2378 md->queue.blkdata = md;
2379 md->part_type = part_type;
2381 md->disk->major = MMC_BLOCK_MAJOR;
2382 md->disk->minors = perdev_minors;
2383 md->disk->first_minor = devidx * perdev_minors;
2384 md->disk->fops = &mmc_bdops;
2385 md->disk->private_data = md;
2386 md->parent = parent;
2387 set_disk_ro(md->disk, md->read_only || default_ro);
2388 md->disk->flags = GENHD_FL_EXT_DEVT;
2389 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2390 md->disk->flags |= GENHD_FL_NO_PART_SCAN
2391 | GENHD_FL_SUPPRESS_PARTITION_INFO;
2394 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2396 * - be set for removable media with permanent block devices
2397 * - be unset for removable block devices with permanent media
2399 * Since MMC block devices clearly fall under the second
2400 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2401 * should use the block device creation/destruction hotplug
2402 * messages to tell when the card is present.
2405 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2406 "mmcblk%u%s", card->host->index, subname ? subname : "");
2408 set_capacity(md->disk, size);
2410 if (mmc_host_cmd23(card->host)) {
2411 if ((mmc_card_mmc(card) &&
2412 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2413 (mmc_card_sd(card) &&
2414 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2415 md->flags |= MMC_BLK_CMD23;
2418 if (mmc_card_mmc(card) &&
2419 md->flags & MMC_BLK_CMD23 &&
2420 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2421 card->ext_csd.rel_sectors)) {
2422 md->flags |= MMC_BLK_REL_WR;
2423 blk_queue_write_cache(md->queue.queue, true, true);
2426 string_get_size((u64)size, 512, STRING_UNITS_2,
2427 cap_str, sizeof(cap_str));
2428 pr_info("%s: %s %s %s %s\n",
2429 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2430 cap_str, md->read_only ? "(ro)" : "");
2432 /* used in ->open, must be set before add_disk: */
2433 if (area_type == MMC_BLK_DATA_AREA_MAIN)
2434 dev_set_drvdata(&card->dev, md);
2435 device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
2441 ida_simple_remove(&mmc_blk_ida, devidx);
2442 return ERR_PTR(ret);
2445 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2449 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2451 * The EXT_CSD sector count is in number or 512 byte
2454 size = card->ext_csd.sectors;
2457 * The CSD capacity field is in units of read_blkbits.
2458 * set_capacity takes units of 512 bytes.
2460 size = (typeof(sector_t))card->csd.capacity
2461 << (card->csd.read_blkbits - 9);
2464 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2465 MMC_BLK_DATA_AREA_MAIN, 0);
2468 static int mmc_blk_alloc_part(struct mmc_card *card,
2469 struct mmc_blk_data *md,
2470 unsigned int part_type,
2473 const char *subname,
2476 struct mmc_blk_data *part_md;
2478 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2479 subname, area_type, part_type);
2480 if (IS_ERR(part_md))
2481 return PTR_ERR(part_md);
2482 list_add(&part_md->part, &md->part);
2488 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2489 * @filp: the character device file
2490 * @cmd: the ioctl() command
2491 * @arg: the argument from userspace
2493 * This will essentially just redirect the ioctl()s coming in over to
2494 * the main block device spawning the RPMB character device.
2496 static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2499 struct mmc_rpmb_data *rpmb = filp->private_data;
2504 ret = mmc_blk_ioctl_cmd(rpmb->md,
2505 (struct mmc_ioc_cmd __user *)arg,
2508 case MMC_IOC_MULTI_CMD:
2509 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2510 (struct mmc_ioc_multi_cmd __user *)arg,
2521 #ifdef CONFIG_COMPAT
2522 static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2525 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2529 static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2531 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2532 struct mmc_rpmb_data, chrdev);
2534 get_device(&rpmb->dev);
2535 filp->private_data = rpmb;
2536 mmc_blk_get(rpmb->md->disk);
2538 return nonseekable_open(inode, filp);
2541 static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2543 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2544 struct mmc_rpmb_data, chrdev);
2546 mmc_blk_put(rpmb->md);
2547 put_device(&rpmb->dev);
2552 static const struct file_operations mmc_rpmb_fileops = {
2553 .release = mmc_rpmb_chrdev_release,
2554 .open = mmc_rpmb_chrdev_open,
2555 .owner = THIS_MODULE,
2556 .llseek = no_llseek,
2557 .unlocked_ioctl = mmc_rpmb_ioctl,
2558 #ifdef CONFIG_COMPAT
2559 .compat_ioctl = mmc_rpmb_ioctl_compat,
2563 static void mmc_blk_rpmb_device_release(struct device *dev)
2565 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2567 ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
2571 static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2572 struct mmc_blk_data *md,
2573 unsigned int part_index,
2575 const char *subname)
2578 char rpmb_name[DISK_NAME_LEN];
2580 struct mmc_rpmb_data *rpmb;
2582 /* This creates the minor number for the RPMB char device */
2583 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
2587 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2589 ida_simple_remove(&mmc_rpmb_ida, devidx);
2593 snprintf(rpmb_name, sizeof(rpmb_name),
2594 "mmcblk%u%s", card->host->index, subname ? subname : "");
2597 rpmb->part_index = part_index;
2598 rpmb->dev.init_name = rpmb_name;
2599 rpmb->dev.bus = &mmc_rpmb_bus_type;
2600 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
2601 rpmb->dev.parent = &card->dev;
2602 rpmb->dev.release = mmc_blk_rpmb_device_release;
2603 device_initialize(&rpmb->dev);
2604 dev_set_drvdata(&rpmb->dev, rpmb);
2607 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
2608 rpmb->chrdev.owner = THIS_MODULE;
2609 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
2611 pr_err("%s: could not add character device\n", rpmb_name);
2612 goto out_put_device;
2615 list_add(&rpmb->node, &md->rpmbs);
2617 string_get_size((u64)size, 512, STRING_UNITS_2,
2618 cap_str, sizeof(cap_str));
2620 pr_info("%s: %s %s %s, chardev (%d:%d)\n",
2621 rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str,
2622 MAJOR(mmc_rpmb_devt), rpmb->id);
2627 put_device(&rpmb->dev);
2631 static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
2634 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
2635 put_device(&rpmb->dev);
2638 /* MMC Physical partitions consist of two boot partitions and
2639 * up to four general purpose partitions.
2640 * For each partition enabled in EXT_CSD a block device will be allocatedi
2641 * to provide access to the partition.
2644 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2648 if (!mmc_card_mmc(card))
2651 for (idx = 0; idx < card->nr_parts; idx++) {
2652 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
2654 * RPMB partitions does not provide block access, they
2655 * are only accessed using ioctl():s. Thus create
2656 * special RPMB block devices that do not have a
2657 * backing block queue for these.
2659 ret = mmc_blk_alloc_rpmb_part(card, md,
2660 card->part[idx].part_cfg,
2661 card->part[idx].size >> 9,
2662 card->part[idx].name);
2665 } else if (card->part[idx].size) {
2666 ret = mmc_blk_alloc_part(card, md,
2667 card->part[idx].part_cfg,
2668 card->part[idx].size >> 9,
2669 card->part[idx].force_ro,
2670 card->part[idx].name,
2671 card->part[idx].area_type);
2680 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2683 * Flush remaining requests and free queues. It is freeing the queue
2684 * that stops new requests from being accepted.
2686 del_gendisk(md->disk);
2687 mmc_cleanup_queue(&md->queue);
2691 static void mmc_blk_remove_parts(struct mmc_card *card,
2692 struct mmc_blk_data *md)
2694 struct list_head *pos, *q;
2695 struct mmc_blk_data *part_md;
2696 struct mmc_rpmb_data *rpmb;
2698 /* Remove RPMB partitions */
2699 list_for_each_safe(pos, q, &md->rpmbs) {
2700 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
2702 mmc_blk_remove_rpmb_part(rpmb);
2704 /* Remove block partitions */
2705 list_for_each_safe(pos, q, &md->part) {
2706 part_md = list_entry(pos, struct mmc_blk_data, part);
2708 mmc_blk_remove_req(part_md);
2712 #ifdef CONFIG_DEBUG_FS
2714 static int mmc_dbg_card_status_get(void *data, u64 *val)
2716 struct mmc_card *card = data;
2717 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2718 struct mmc_queue *mq = &md->queue;
2719 struct request *req;
2722 /* Ask the block layer about the card status */
2723 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2725 return PTR_ERR(req);
2726 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
2727 blk_execute_rq(NULL, req, 0);
2728 ret = req_to_mmc_queue_req(req)->drv_op_result;
2733 blk_put_request(req);
2737 DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
2740 /* That is two digits * 512 + 1 for newline */
2741 #define EXT_CSD_STR_LEN 1025
2743 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
2745 struct mmc_card *card = inode->i_private;
2746 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2747 struct mmc_queue *mq = &md->queue;
2748 struct request *req;
2754 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
2758 /* Ask the block layer for the EXT CSD */
2759 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2764 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
2765 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
2766 blk_execute_rq(NULL, req, 0);
2767 err = req_to_mmc_queue_req(req)->drv_op_result;
2768 blk_put_request(req);
2770 pr_err("FAILED %d\n", err);
2774 for (i = 0; i < 512; i++)
2775 n += sprintf(buf + n, "%02x", ext_csd[i]);
2776 n += sprintf(buf + n, "\n");
2778 if (n != EXT_CSD_STR_LEN) {
2784 filp->private_data = buf;
2793 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
2794 size_t cnt, loff_t *ppos)
2796 char *buf = filp->private_data;
2798 return simple_read_from_buffer(ubuf, cnt, ppos,
2799 buf, EXT_CSD_STR_LEN);
2802 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
2804 kfree(file->private_data);
2808 static const struct file_operations mmc_dbg_ext_csd_fops = {
2809 .open = mmc_ext_csd_open,
2810 .read = mmc_ext_csd_read,
2811 .release = mmc_ext_csd_release,
2812 .llseek = default_llseek,
2815 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2817 struct dentry *root;
2819 if (!card->debugfs_root)
2822 root = card->debugfs_root;
2824 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
2826 debugfs_create_file_unsafe("status", 0400, root,
2828 &mmc_dbg_card_status_fops);
2829 if (!md->status_dentry)
2833 if (mmc_card_mmc(card)) {
2834 md->ext_csd_dentry =
2835 debugfs_create_file("ext_csd", S_IRUSR, root, card,
2836 &mmc_dbg_ext_csd_fops);
2837 if (!md->ext_csd_dentry)
2844 static void mmc_blk_remove_debugfs(struct mmc_card *card,
2845 struct mmc_blk_data *md)
2847 if (!card->debugfs_root)
2850 if (!IS_ERR_OR_NULL(md->status_dentry)) {
2851 debugfs_remove(md->status_dentry);
2852 md->status_dentry = NULL;
2855 if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) {
2856 debugfs_remove(md->ext_csd_dentry);
2857 md->ext_csd_dentry = NULL;
2863 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2868 static void mmc_blk_remove_debugfs(struct mmc_card *card,
2869 struct mmc_blk_data *md)
2873 #endif /* CONFIG_DEBUG_FS */
2875 static int mmc_blk_probe(struct mmc_card *card)
2877 struct mmc_blk_data *md;
2881 * Check that the card supports the command class(es) we need.
2883 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2886 mmc_fixup_device(card, mmc_blk_fixups);
2888 card->complete_wq = alloc_workqueue("mmc_complete",
2889 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
2890 if (!card->complete_wq) {
2891 pr_err("Failed to create mmc completion workqueue");
2895 md = mmc_blk_alloc(card);
2901 ret = mmc_blk_alloc_parts(card, md);
2905 /* Add two debugfs entries */
2906 mmc_blk_add_debugfs(card, md);
2908 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2909 pm_runtime_use_autosuspend(&card->dev);
2912 * Don't enable runtime PM for SD-combo cards here. Leave that
2913 * decision to be taken during the SDIO init sequence instead.
2915 if (card->type != MMC_TYPE_SD_COMBO) {
2916 pm_runtime_set_active(&card->dev);
2917 pm_runtime_enable(&card->dev);
2923 mmc_blk_remove_parts(card, md);
2924 mmc_blk_remove_req(md);
2926 destroy_workqueue(card->complete_wq);
2930 static void mmc_blk_remove(struct mmc_card *card)
2932 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2934 mmc_blk_remove_debugfs(card, md);
2935 mmc_blk_remove_parts(card, md);
2936 pm_runtime_get_sync(&card->dev);
2937 if (md->part_curr != md->part_type) {
2938 mmc_claim_host(card->host);
2939 mmc_blk_part_switch(card, md->part_type);
2940 mmc_release_host(card->host);
2942 if (card->type != MMC_TYPE_SD_COMBO)
2943 pm_runtime_disable(&card->dev);
2944 pm_runtime_put_noidle(&card->dev);
2945 mmc_blk_remove_req(md);
2946 dev_set_drvdata(&card->dev, NULL);
2947 destroy_workqueue(card->complete_wq);
2950 static int _mmc_blk_suspend(struct mmc_card *card)
2952 struct mmc_blk_data *part_md;
2953 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2956 mmc_queue_suspend(&md->queue);
2957 list_for_each_entry(part_md, &md->part, part) {
2958 mmc_queue_suspend(&part_md->queue);
2964 static void mmc_blk_shutdown(struct mmc_card *card)
2966 _mmc_blk_suspend(card);
2969 #ifdef CONFIG_PM_SLEEP
2970 static int mmc_blk_suspend(struct device *dev)
2972 struct mmc_card *card = mmc_dev_to_card(dev);
2974 return _mmc_blk_suspend(card);
2977 static int mmc_blk_resume(struct device *dev)
2979 struct mmc_blk_data *part_md;
2980 struct mmc_blk_data *md = dev_get_drvdata(dev);
2984 * Resume involves the card going into idle state,
2985 * so current partition is always the main one.
2987 md->part_curr = md->part_type;
2988 mmc_queue_resume(&md->queue);
2989 list_for_each_entry(part_md, &md->part, part) {
2990 mmc_queue_resume(&part_md->queue);
2997 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2999 static struct mmc_driver mmc_driver = {
3002 .pm = &mmc_blk_pm_ops,
3004 .probe = mmc_blk_probe,
3005 .remove = mmc_blk_remove,
3006 .shutdown = mmc_blk_shutdown,
3009 static int __init mmc_blk_init(void)
3013 res = bus_register(&mmc_rpmb_bus_type);
3015 pr_err("mmcblk: could not register RPMB bus type\n");
3018 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3020 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3024 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3025 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3027 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3029 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3031 goto out_chrdev_unreg;
3033 res = mmc_register_driver(&mmc_driver);
3035 goto out_blkdev_unreg;
3040 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3042 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3044 bus_unregister(&mmc_rpmb_bus_type);
3048 static void __exit mmc_blk_exit(void)
3050 mmc_unregister_driver(&mmc_driver);
3051 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3052 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3053 bus_unregister(&mmc_rpmb_bus_type);
3056 module_init(mmc_blk_init);
3057 module_exit(mmc_blk_exit);
3059 MODULE_LICENSE("GPL");
3060 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");