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_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
74 #define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
76 #define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
77 (rq_data_dir(req) == WRITE))
78 static DEFINE_MUTEX(block_mutex);
81 * The defaults come from config options but can be overriden by module
84 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
87 * We've only got one major, so number of mmcblk devices is
88 * limited to (1 << 20) / number of minors per device. It is also
89 * limited by the MAX_DEVICES below.
91 static int max_devices;
93 #define MAX_DEVICES 256
95 static DEFINE_IDA(mmc_blk_ida);
96 static DEFINE_IDA(mmc_rpmb_ida);
99 * There is one mmc_blk_data per slot.
101 struct mmc_blk_data {
102 struct device *parent;
103 struct gendisk *disk;
104 struct mmc_queue queue;
105 struct list_head part;
106 struct list_head rpmbs;
109 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
110 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
113 unsigned int read_only;
114 unsigned int part_type;
115 unsigned int reset_done;
116 #define MMC_BLK_READ BIT(0)
117 #define MMC_BLK_WRITE BIT(1)
118 #define MMC_BLK_DISCARD BIT(2)
119 #define MMC_BLK_SECDISCARD BIT(3)
120 #define MMC_BLK_CQE_RECOVERY BIT(4)
123 * Only set in main mmc_blk_data associated
124 * with mmc_card with dev_set_drvdata, and keeps
125 * track of the current selected device partition.
127 unsigned int part_curr;
128 struct device_attribute force_ro;
129 struct device_attribute power_ro_lock;
132 /* debugfs files (only in main mmc_blk_data) */
133 struct dentry *status_dentry;
134 struct dentry *ext_csd_dentry;
137 /* Device type for RPMB character devices */
138 static dev_t mmc_rpmb_devt;
140 /* Bus type for RPMB character devices */
141 static struct bus_type mmc_rpmb_bus_type = {
146 * struct mmc_rpmb_data - special RPMB device type for these areas
147 * @dev: the device for the RPMB area
148 * @chrdev: character device for the RPMB area
149 * @id: unique device ID number
150 * @part_index: partition index (0 on first)
151 * @md: parent MMC block device
152 * @node: list item, so we can put this device on a list
154 struct mmc_rpmb_data {
158 unsigned int part_index;
159 struct mmc_blk_data *md;
160 struct list_head node;
163 static DEFINE_MUTEX(open_lock);
165 module_param(perdev_minors, int, 0444);
166 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
168 static inline int mmc_blk_part_switch(struct mmc_card *card,
169 unsigned int part_type);
170 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
171 struct mmc_card *card,
173 struct mmc_queue *mq);
174 static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
176 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
178 struct mmc_blk_data *md;
180 mutex_lock(&open_lock);
181 md = disk->private_data;
182 if (md && md->usage == 0)
186 mutex_unlock(&open_lock);
191 static inline int mmc_get_devidx(struct gendisk *disk)
193 int devidx = disk->first_minor / perdev_minors;
197 static void mmc_blk_put(struct mmc_blk_data *md)
199 mutex_lock(&open_lock);
201 if (md->usage == 0) {
202 int devidx = mmc_get_devidx(md->disk);
203 blk_put_queue(md->queue.queue);
204 ida_simple_remove(&mmc_blk_ida, devidx);
208 mutex_unlock(&open_lock);
211 static ssize_t power_ro_lock_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
215 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
216 struct mmc_card *card = md->queue.card;
219 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
221 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
224 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
231 static ssize_t power_ro_lock_store(struct device *dev,
232 struct device_attribute *attr, const char *buf, size_t count)
235 struct mmc_blk_data *md, *part_md;
236 struct mmc_queue *mq;
240 if (kstrtoul(buf, 0, &set))
246 md = mmc_blk_get(dev_to_disk(dev));
249 /* Dispatch locking to the block layer */
250 req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, 0);
252 count = PTR_ERR(req);
255 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
256 blk_execute_rq(mq->queue, NULL, req, 0);
257 ret = req_to_mmc_queue_req(req)->drv_op_result;
258 blk_put_request(req);
261 pr_info("%s: Locking boot partition ro until next power on\n",
262 md->disk->disk_name);
263 set_disk_ro(md->disk, 1);
265 list_for_each_entry(part_md, &md->part, part)
266 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
267 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
268 set_disk_ro(part_md->disk, 1);
276 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
280 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
282 ret = snprintf(buf, PAGE_SIZE, "%d\n",
283 get_disk_ro(dev_to_disk(dev)) ^
289 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
290 const char *buf, size_t count)
294 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
295 unsigned long set = simple_strtoul(buf, &end, 0);
301 set_disk_ro(dev_to_disk(dev), set || md->read_only);
308 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
310 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
313 mutex_lock(&block_mutex);
316 check_disk_change(bdev);
319 if ((mode & FMODE_WRITE) && md->read_only) {
324 mutex_unlock(&block_mutex);
329 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
331 struct mmc_blk_data *md = disk->private_data;
333 mutex_lock(&block_mutex);
335 mutex_unlock(&block_mutex);
339 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
341 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
347 struct mmc_blk_ioc_data {
348 struct mmc_ioc_cmd ic;
351 struct mmc_rpmb_data *rpmb;
354 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
355 struct mmc_ioc_cmd __user *user)
357 struct mmc_blk_ioc_data *idata;
360 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
366 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
371 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
372 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
377 if (!idata->buf_bytes) {
382 idata->buf = memdup_user((void __user *)(unsigned long)
383 idata->ic.data_ptr, idata->buf_bytes);
384 if (IS_ERR(idata->buf)) {
385 err = PTR_ERR(idata->buf);
397 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
398 struct mmc_blk_ioc_data *idata)
400 struct mmc_ioc_cmd *ic = &idata->ic;
402 if (copy_to_user(&(ic_ptr->response), ic->response,
403 sizeof(ic->response)))
406 if (!idata->ic.write_flag) {
407 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
408 idata->buf, idata->buf_bytes))
415 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
418 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
423 bool done = time_after(jiffies, timeout);
425 err = __mmc_send_status(card, &status, 5);
427 dev_err(mmc_dev(card->host),
428 "error %d requesting status\n", err);
432 /* Accumulate any response error bits seen */
434 *resp_errs |= status;
437 * Timeout if the device never becomes ready for data and never
438 * leaves the program state.
441 dev_err(mmc_dev(card->host),
442 "Card stuck in wrong state! %s status: %#x\n",
446 } while (!mmc_ready_for_data(status));
451 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
452 struct mmc_blk_ioc_data *idata)
454 struct mmc_command cmd = {}, sbc = {};
455 struct mmc_data data = {};
456 struct mmc_request mrq = {};
457 struct scatterlist sg;
459 unsigned int target_part;
461 if (!card || !md || !idata)
465 * The RPMB accesses comes in from the character device, so we
466 * need to target these explicitly. Else we just target the
467 * partition type for the block device the ioctl() was issued
471 /* Support multiple RPMB partitions */
472 target_part = idata->rpmb->part_index;
473 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
475 target_part = md->part_type;
478 cmd.opcode = idata->ic.opcode;
479 cmd.arg = idata->ic.arg;
480 cmd.flags = idata->ic.flags;
482 if (idata->buf_bytes) {
485 data.blksz = idata->ic.blksz;
486 data.blocks = idata->ic.blocks;
488 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
490 if (idata->ic.write_flag)
491 data.flags = MMC_DATA_WRITE;
493 data.flags = MMC_DATA_READ;
495 /* data.flags must already be set before doing this. */
496 mmc_set_data_timeout(&data, card);
498 /* Allow overriding the timeout_ns for empirical tuning. */
499 if (idata->ic.data_timeout_ns)
500 data.timeout_ns = idata->ic.data_timeout_ns;
502 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
504 * Pretend this is a data transfer and rely on the
505 * host driver to compute timeout. When all host
506 * drivers support cmd.cmd_timeout for R1B, this
510 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
512 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
520 err = mmc_blk_part_switch(card, target_part);
524 if (idata->ic.is_acmd) {
525 err = mmc_app_cmd(card->host, card);
531 sbc.opcode = MMC_SET_BLOCK_COUNT;
533 * We don't do any blockcount validation because the max size
534 * may be increased by a future standard. We just copy the
535 * 'Reliable Write' bit here.
537 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
538 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
542 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
543 (cmd.opcode == MMC_SWITCH))
544 return mmc_sanitize(card);
546 mmc_wait_for_req(card->host, &mrq);
549 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
550 __func__, cmd.error);
554 dev_err(mmc_dev(card->host), "%s: data error %d\n",
555 __func__, data.error);
560 * Make sure the cache of the PARTITION_CONFIG register and
561 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
562 * changed it successfully.
564 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
565 (cmd.opcode == MMC_SWITCH)) {
566 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
567 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
570 * Update cache so the next mmc_blk_part_switch call operates
571 * on up-to-date data.
573 card->ext_csd.part_config = value;
574 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
578 * According to the SD specs, some commands require a delay after
579 * issuing the command.
581 if (idata->ic.postsleep_min_us)
582 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
584 memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
586 if (idata->rpmb || (cmd.flags & MMC_RSP_R1B)) {
588 * Ensure RPMB/R1B command has completed by polling CMD13
591 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL);
597 static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
598 struct mmc_ioc_cmd __user *ic_ptr,
599 struct mmc_rpmb_data *rpmb)
601 struct mmc_blk_ioc_data *idata;
602 struct mmc_blk_ioc_data *idatas[1];
603 struct mmc_queue *mq;
604 struct mmc_card *card;
605 int err = 0, ioc_err = 0;
608 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
610 return PTR_ERR(idata);
611 /* This will be NULL on non-RPMB ioctl():s */
614 card = md->queue.card;
621 * Dispatch the ioctl() into the block request queue.
624 req = blk_get_request(mq->queue,
625 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
631 req_to_mmc_queue_req(req)->drv_op =
632 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
633 req_to_mmc_queue_req(req)->drv_op_data = idatas;
634 req_to_mmc_queue_req(req)->ioc_count = 1;
635 blk_execute_rq(mq->queue, NULL, req, 0);
636 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
637 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
638 blk_put_request(req);
643 return ioc_err ? ioc_err : err;
646 static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
647 struct mmc_ioc_multi_cmd __user *user,
648 struct mmc_rpmb_data *rpmb)
650 struct mmc_blk_ioc_data **idata = NULL;
651 struct mmc_ioc_cmd __user *cmds = user->cmds;
652 struct mmc_card *card;
653 struct mmc_queue *mq;
654 int i, err = 0, ioc_err = 0;
658 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
659 sizeof(num_of_cmds)))
665 if (num_of_cmds > MMC_IOC_MAX_CMDS)
668 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
672 for (i = 0; i < num_of_cmds; i++) {
673 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
674 if (IS_ERR(idata[i])) {
675 err = PTR_ERR(idata[i]);
679 /* This will be NULL on non-RPMB ioctl():s */
680 idata[i]->rpmb = rpmb;
683 card = md->queue.card;
691 * Dispatch the ioctl()s into the block request queue.
694 req = blk_get_request(mq->queue,
695 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
700 req_to_mmc_queue_req(req)->drv_op =
701 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
702 req_to_mmc_queue_req(req)->drv_op_data = idata;
703 req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
704 blk_execute_rq(mq->queue, NULL, req, 0);
705 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
707 /* copy to user if data and response */
708 for (i = 0; i < num_of_cmds && !err; i++)
709 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
711 blk_put_request(req);
714 for (i = 0; i < num_of_cmds; i++) {
715 kfree(idata[i]->buf);
719 return ioc_err ? ioc_err : err;
722 static int mmc_blk_check_blkdev(struct block_device *bdev)
725 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
726 * whole block device, not on a partition. This prevents overspray
727 * between sibling partitions.
729 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
734 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
735 unsigned int cmd, unsigned long arg)
737 struct mmc_blk_data *md;
742 ret = mmc_blk_check_blkdev(bdev);
745 md = mmc_blk_get(bdev->bd_disk);
748 ret = mmc_blk_ioctl_cmd(md,
749 (struct mmc_ioc_cmd __user *)arg,
753 case MMC_IOC_MULTI_CMD:
754 ret = mmc_blk_check_blkdev(bdev);
757 md = mmc_blk_get(bdev->bd_disk);
760 ret = mmc_blk_ioctl_multi_cmd(md,
761 (struct mmc_ioc_multi_cmd __user *)arg,
771 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
772 unsigned int cmd, unsigned long arg)
774 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
778 static const struct block_device_operations mmc_bdops = {
779 .open = mmc_blk_open,
780 .release = mmc_blk_release,
781 .getgeo = mmc_blk_getgeo,
782 .owner = THIS_MODULE,
783 .ioctl = mmc_blk_ioctl,
785 .compat_ioctl = mmc_blk_compat_ioctl,
789 static int mmc_blk_part_switch_pre(struct mmc_card *card,
790 unsigned int part_type)
794 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
795 if (card->ext_csd.cmdq_en) {
796 ret = mmc_cmdq_disable(card);
800 mmc_retune_pause(card->host);
806 static int mmc_blk_part_switch_post(struct mmc_card *card,
807 unsigned int part_type)
811 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
812 mmc_retune_unpause(card->host);
813 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
814 ret = mmc_cmdq_enable(card);
820 static inline int mmc_blk_part_switch(struct mmc_card *card,
821 unsigned int part_type)
824 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
826 if (main_md->part_curr == part_type)
829 if (mmc_card_mmc(card)) {
830 u8 part_config = card->ext_csd.part_config;
832 ret = mmc_blk_part_switch_pre(card, part_type);
836 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
837 part_config |= part_type;
839 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
840 EXT_CSD_PART_CONFIG, part_config,
841 card->ext_csd.part_time);
843 mmc_blk_part_switch_post(card, part_type);
847 card->ext_csd.part_config = part_config;
849 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
852 main_md->part_curr = part_type;
856 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
862 struct mmc_request mrq = {};
863 struct mmc_command cmd = {};
864 struct mmc_data data = {};
866 struct scatterlist sg;
868 cmd.opcode = MMC_APP_CMD;
869 cmd.arg = card->rca << 16;
870 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
872 err = mmc_wait_for_cmd(card->host, &cmd, 0);
875 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
878 memset(&cmd, 0, sizeof(struct mmc_command));
880 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
882 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
886 data.flags = MMC_DATA_READ;
889 mmc_set_data_timeout(&data, card);
894 blocks = kmalloc(4, GFP_KERNEL);
898 sg_init_one(&sg, blocks, 4);
900 mmc_wait_for_req(card->host, &mrq);
902 result = ntohl(*blocks);
905 if (cmd.error || data.error)
908 *written_blocks = result;
913 static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
915 if (host->actual_clock)
916 return host->actual_clock / 1000;
918 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
920 return host->ios.clock / 2000;
922 /* How can there be no clock */
924 return 100; /* 100 kHz is minimum possible value */
927 static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
928 struct mmc_data *data)
930 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
933 if (data->timeout_clks) {
934 khz = mmc_blk_clock_khz(host);
935 ms += DIV_ROUND_UP(data->timeout_clks, khz);
941 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
946 if (md->reset_done & type)
949 md->reset_done |= type;
950 err = mmc_hw_reset(host);
951 /* Ensure we switch back to the correct partition */
952 if (err != -EOPNOTSUPP) {
953 struct mmc_blk_data *main_md =
954 dev_get_drvdata(&host->card->dev);
957 main_md->part_curr = main_md->part_type;
958 part_err = mmc_blk_part_switch(host->card, md->part_type);
961 * We have failed to get back into the correct
962 * partition, so we need to abort the whole request.
970 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
972 md->reset_done &= ~type;
976 * The non-block commands come back from the block layer after it queued it and
977 * processed it with all other requests and then they get issued in this
980 static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
982 struct mmc_queue_req *mq_rq;
983 struct mmc_card *card = mq->card;
984 struct mmc_blk_data *md = mq->blkdata;
985 struct mmc_blk_ioc_data **idata;
992 mq_rq = req_to_mmc_queue_req(req);
993 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
995 switch (mq_rq->drv_op) {
996 case MMC_DRV_OP_IOCTL:
997 case MMC_DRV_OP_IOCTL_RPMB:
998 idata = mq_rq->drv_op_data;
999 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1000 ret = __mmc_blk_ioctl_cmd(card, md, idata[i]);
1004 /* Always switch back to main area after RPMB access */
1006 mmc_blk_part_switch(card, 0);
1008 case MMC_DRV_OP_BOOT_WP:
1009 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1010 card->ext_csd.boot_ro_lock |
1011 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1012 card->ext_csd.part_time);
1014 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1015 md->disk->disk_name, ret);
1017 card->ext_csd.boot_ro_lock |=
1018 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1020 case MMC_DRV_OP_GET_CARD_STATUS:
1021 ret = mmc_send_status(card, &status);
1025 case MMC_DRV_OP_GET_EXT_CSD:
1026 ext_csd = mq_rq->drv_op_data;
1027 ret = mmc_get_ext_csd(card, ext_csd);
1030 pr_err("%s: unknown driver specific operation\n",
1031 md->disk->disk_name);
1035 mq_rq->drv_op_result = ret;
1036 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1039 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1041 struct mmc_blk_data *md = mq->blkdata;
1042 struct mmc_card *card = md->queue.card;
1043 unsigned int from, nr;
1044 int err = 0, type = MMC_BLK_DISCARD;
1045 blk_status_t status = BLK_STS_OK;
1047 if (!mmc_can_erase(card)) {
1048 status = BLK_STS_NOTSUPP;
1052 from = blk_rq_pos(req);
1053 nr = blk_rq_sectors(req);
1057 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1058 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1059 INAND_CMD38_ARG_EXT_CSD,
1060 card->erase_arg == MMC_TRIM_ARG ?
1061 INAND_CMD38_ARG_TRIM :
1062 INAND_CMD38_ARG_ERASE,
1063 card->ext_csd.generic_cmd6_time);
1066 err = mmc_erase(card, from, nr, card->erase_arg);
1067 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1069 status = BLK_STS_IOERR;
1071 mmc_blk_reset_success(md, type);
1073 blk_mq_end_request(req, status);
1076 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1077 struct request *req)
1079 struct mmc_blk_data *md = mq->blkdata;
1080 struct mmc_card *card = md->queue.card;
1081 unsigned int from, nr, arg;
1082 int err = 0, type = MMC_BLK_SECDISCARD;
1083 blk_status_t status = BLK_STS_OK;
1085 if (!(mmc_can_secure_erase_trim(card))) {
1086 status = BLK_STS_NOTSUPP;
1090 from = blk_rq_pos(req);
1091 nr = blk_rq_sectors(req);
1093 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1094 arg = MMC_SECURE_TRIM1_ARG;
1096 arg = MMC_SECURE_ERASE_ARG;
1099 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1100 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1101 INAND_CMD38_ARG_EXT_CSD,
1102 arg == MMC_SECURE_TRIM1_ARG ?
1103 INAND_CMD38_ARG_SECTRIM1 :
1104 INAND_CMD38_ARG_SECERASE,
1105 card->ext_csd.generic_cmd6_time);
1110 err = mmc_erase(card, from, nr, arg);
1114 status = BLK_STS_IOERR;
1118 if (arg == MMC_SECURE_TRIM1_ARG) {
1119 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1120 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1121 INAND_CMD38_ARG_EXT_CSD,
1122 INAND_CMD38_ARG_SECTRIM2,
1123 card->ext_csd.generic_cmd6_time);
1128 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1132 status = BLK_STS_IOERR;
1138 if (err && !mmc_blk_reset(md, card->host, type))
1141 mmc_blk_reset_success(md, type);
1143 blk_mq_end_request(req, status);
1146 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1148 struct mmc_blk_data *md = mq->blkdata;
1149 struct mmc_card *card = md->queue.card;
1152 ret = mmc_flush_cache(card);
1153 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1157 * Reformat current write as a reliable write, supporting
1158 * both legacy and the enhanced reliable write MMC cards.
1159 * In each transfer we'll handle only as much as a single
1160 * reliable write can handle, thus finish the request in
1161 * partial completions.
1163 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1164 struct mmc_card *card,
1165 struct request *req)
1167 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1168 /* Legacy mode imposes restrictions on transfers. */
1169 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1170 brq->data.blocks = 1;
1172 if (brq->data.blocks > card->ext_csd.rel_sectors)
1173 brq->data.blocks = card->ext_csd.rel_sectors;
1174 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1175 brq->data.blocks = 1;
1179 #define CMD_ERRORS_EXCL_OOR \
1180 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1181 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1182 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1183 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1184 R1_CC_ERROR | /* Card controller error */ \
1185 R1_ERROR) /* General/unknown error */
1187 #define CMD_ERRORS \
1188 (CMD_ERRORS_EXCL_OOR | \
1189 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1191 static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1196 * Per the SD specification(physical layer version 4.10)[1],
1197 * section 4.3.3, it explicitly states that "When the last
1198 * block of user area is read using CMD18, the host should
1199 * ignore OUT_OF_RANGE error that may occur even the sequence
1200 * is correct". And JESD84-B51 for eMMC also has a similar
1201 * statement on section 6.8.3.
1203 * Multiple block read/write could be done by either predefined
1204 * method, namely CMD23, or open-ending mode. For open-ending mode,
1205 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1207 * However the spec[1] doesn't tell us whether we should also
1208 * ignore that for predefined method. But per the spec[1], section
1209 * 4.15 Set Block Count Command, it says"If illegal block count
1210 * is set, out of range error will be indicated during read/write
1211 * operation (For example, data transfer is stopped at user area
1212 * boundary)." In another word, we could expect a out of range error
1213 * in the response for the following CMD18/25. And if argument of
1214 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1215 * we could also expect to get a -ETIMEDOUT or any error number from
1216 * the host drivers due to missing data response(for write)/data(for
1217 * read), as the cards will stop the data transfer by itself per the
1218 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1221 if (!brq->stop.error) {
1222 bool oor_with_open_end;
1223 /* If there is no error yet, check R1 response */
1225 val = brq->stop.resp[0] & CMD_ERRORS;
1226 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1228 if (val && !oor_with_open_end)
1229 brq->stop.error = -EIO;
1233 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1234 int disable_multi, bool *do_rel_wr_p,
1235 bool *do_data_tag_p)
1237 struct mmc_blk_data *md = mq->blkdata;
1238 struct mmc_card *card = md->queue.card;
1239 struct mmc_blk_request *brq = &mqrq->brq;
1240 struct request *req = mmc_queue_req_to_req(mqrq);
1241 bool do_rel_wr, do_data_tag;
1244 * Reliable writes are used to implement Forced Unit Access and
1245 * are supported only on MMCs.
1247 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1248 rq_data_dir(req) == WRITE &&
1249 (md->flags & MMC_BLK_REL_WR);
1251 memset(brq, 0, sizeof(struct mmc_blk_request));
1253 brq->mrq.data = &brq->data;
1254 brq->mrq.tag = req->tag;
1256 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1259 if (rq_data_dir(req) == READ) {
1260 brq->data.flags = MMC_DATA_READ;
1261 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1263 brq->data.flags = MMC_DATA_WRITE;
1264 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1267 brq->data.blksz = 512;
1268 brq->data.blocks = blk_rq_sectors(req);
1269 brq->data.blk_addr = blk_rq_pos(req);
1272 * The command queue supports 2 priorities: "high" (1) and "simple" (0).
1273 * The eMMC will give "high" priority tasks priority over "simple"
1274 * priority tasks. Here we always set "simple" priority by not setting
1279 * The block layer doesn't support all sector count
1280 * restrictions, so we need to be prepared for too big
1283 if (brq->data.blocks > card->host->max_blk_count)
1284 brq->data.blocks = card->host->max_blk_count;
1286 if (brq->data.blocks > 1) {
1288 * Some SD cards in SPI mode return a CRC error or even lock up
1289 * completely when trying to read the last block using a
1290 * multiblock read command.
1292 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
1293 (blk_rq_pos(req) + blk_rq_sectors(req) ==
1294 get_capacity(md->disk)))
1298 * After a read error, we redo the request one sector
1299 * at a time in order to accurately determine which
1300 * sectors can be read successfully.
1303 brq->data.blocks = 1;
1306 * Some controllers have HW issues while operating
1307 * in multiple I/O mode
1309 if (card->host->ops->multi_io_quirk)
1310 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1311 (rq_data_dir(req) == READ) ?
1312 MMC_DATA_READ : MMC_DATA_WRITE,
1317 mmc_apply_rel_rw(brq, card, req);
1318 brq->data.flags |= MMC_DATA_REL_WR;
1322 * Data tag is used only during writing meta data to speed
1323 * up write and any subsequent read of this meta data
1325 do_data_tag = card->ext_csd.data_tag_unit_size &&
1326 (req->cmd_flags & REQ_META) &&
1327 (rq_data_dir(req) == WRITE) &&
1328 ((brq->data.blocks * brq->data.blksz) >=
1329 card->ext_csd.data_tag_unit_size);
1332 brq->data.flags |= MMC_DATA_DAT_TAG;
1334 mmc_set_data_timeout(&brq->data, card);
1336 brq->data.sg = mqrq->sg;
1337 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1340 * Adjust the sg list so it is the same size as the
1343 if (brq->data.blocks != blk_rq_sectors(req)) {
1344 int i, data_size = brq->data.blocks << 9;
1345 struct scatterlist *sg;
1347 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1348 data_size -= sg->length;
1349 if (data_size <= 0) {
1350 sg->length += data_size;
1355 brq->data.sg_len = i;
1359 *do_rel_wr_p = do_rel_wr;
1362 *do_data_tag_p = do_data_tag;
1365 #define MMC_CQE_RETRIES 2
1367 static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
1369 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1370 struct mmc_request *mrq = &mqrq->brq.mrq;
1371 struct request_queue *q = req->q;
1372 struct mmc_host *host = mq->card->host;
1373 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
1374 unsigned long flags;
1378 mmc_cqe_post_req(host, mrq);
1380 if (mrq->cmd && mrq->cmd->error)
1381 err = mrq->cmd->error;
1382 else if (mrq->data && mrq->data->error)
1383 err = mrq->data->error;
1388 if (mqrq->retries++ < MMC_CQE_RETRIES)
1389 blk_mq_requeue_request(req, true);
1391 blk_mq_end_request(req, BLK_STS_IOERR);
1392 } else if (mrq->data) {
1393 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
1394 blk_mq_requeue_request(req, true);
1396 __blk_mq_end_request(req, BLK_STS_OK);
1398 blk_mq_end_request(req, BLK_STS_OK);
1401 spin_lock_irqsave(&mq->lock, flags);
1403 mq->in_flight[issue_type] -= 1;
1405 put_card = (mmc_tot_in_flight(mq) == 0);
1407 mmc_cqe_check_busy(mq);
1409 spin_unlock_irqrestore(&mq->lock, flags);
1412 blk_mq_run_hw_queues(q, true);
1415 mmc_put_card(mq->card, &mq->ctx);
1418 void mmc_blk_cqe_recovery(struct mmc_queue *mq)
1420 struct mmc_card *card = mq->card;
1421 struct mmc_host *host = card->host;
1424 pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
1426 err = mmc_cqe_recovery(host);
1428 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
1430 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1432 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1435 static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1437 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1439 struct request *req = mmc_queue_req_to_req(mqrq);
1440 struct request_queue *q = req->q;
1441 struct mmc_queue *mq = q->queuedata;
1444 * Block layer timeouts race with completions which means the normal
1445 * completion path cannot be used during recovery.
1447 if (mq->in_recovery)
1448 mmc_blk_cqe_complete_rq(mq, req);
1450 blk_mq_complete_request(req);
1453 static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1455 mrq->done = mmc_blk_cqe_req_done;
1456 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1458 return mmc_cqe_start_req(host, mrq);
1461 static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1462 struct request *req)
1464 struct mmc_blk_request *brq = &mqrq->brq;
1466 memset(brq, 0, sizeof(*brq));
1468 brq->mrq.cmd = &brq->cmd;
1469 brq->mrq.tag = req->tag;
1474 static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1476 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1477 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1479 mrq->cmd->opcode = MMC_SWITCH;
1480 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1481 (EXT_CSD_FLUSH_CACHE << 16) |
1483 EXT_CSD_CMD_SET_NORMAL;
1484 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1486 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1489 static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1491 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1492 struct mmc_host *host = mq->card->host;
1495 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1496 mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
1497 mmc_pre_req(host, &mqrq->brq.mrq);
1499 err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
1501 mmc_post_req(host, &mqrq->brq.mrq, err);
1506 static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1508 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1509 struct mmc_host *host = mq->card->host;
1511 if (host->hsq_enabled)
1512 return mmc_blk_hsq_issue_rw_rq(mq, req);
1514 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1516 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1519 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1520 struct mmc_card *card,
1522 struct mmc_queue *mq)
1524 u32 readcmd, writecmd;
1525 struct mmc_blk_request *brq = &mqrq->brq;
1526 struct request *req = mmc_queue_req_to_req(mqrq);
1527 struct mmc_blk_data *md = mq->blkdata;
1528 bool do_rel_wr, do_data_tag;
1530 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1532 brq->mrq.cmd = &brq->cmd;
1534 brq->cmd.arg = blk_rq_pos(req);
1535 if (!mmc_card_blockaddr(card))
1537 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1539 if (brq->data.blocks > 1 || do_rel_wr) {
1540 /* SPI multiblock writes terminate using a special
1541 * token, not a STOP_TRANSMISSION request.
1543 if (!mmc_host_is_spi(card->host) ||
1544 rq_data_dir(req) == READ)
1545 brq->mrq.stop = &brq->stop;
1546 readcmd = MMC_READ_MULTIPLE_BLOCK;
1547 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1549 brq->mrq.stop = NULL;
1550 readcmd = MMC_READ_SINGLE_BLOCK;
1551 writecmd = MMC_WRITE_BLOCK;
1553 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1556 * Pre-defined multi-block transfers are preferable to
1557 * open ended-ones (and necessary for reliable writes).
1558 * However, it is not sufficient to just send CMD23,
1559 * and avoid the final CMD12, as on an error condition
1560 * CMD12 (stop) needs to be sent anyway. This, coupled
1561 * with Auto-CMD23 enhancements provided by some
1562 * hosts, means that the complexity of dealing
1563 * with this is best left to the host. If CMD23 is
1564 * supported by card and host, we'll fill sbc in and let
1565 * the host deal with handling it correctly. This means
1566 * that for hosts that don't expose MMC_CAP_CMD23, no
1567 * change of behavior will be observed.
1569 * N.B: Some MMC cards experience perf degradation.
1570 * We'll avoid using CMD23-bounded multiblock writes for
1571 * these, while retaining features like reliable writes.
1573 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1574 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1576 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1577 brq->sbc.arg = brq->data.blocks |
1578 (do_rel_wr ? (1 << 31) : 0) |
1579 (do_data_tag ? (1 << 29) : 0);
1580 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1581 brq->mrq.sbc = &brq->sbc;
1585 #define MMC_MAX_RETRIES 5
1586 #define MMC_DATA_RETRIES 2
1587 #define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1589 static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1591 struct mmc_command cmd = {
1592 .opcode = MMC_STOP_TRANSMISSION,
1593 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1594 /* Some hosts wait for busy anyway, so provide a busy timeout */
1595 .busy_timeout = timeout,
1598 return mmc_wait_for_cmd(card->host, &cmd, 5);
1601 static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1603 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1604 struct mmc_blk_request *brq = &mqrq->brq;
1605 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1608 mmc_retune_hold_now(card->host);
1610 mmc_blk_send_stop(card, timeout);
1612 err = card_busy_detect(card, timeout, NULL);
1614 mmc_retune_release(card->host);
1619 #define MMC_READ_SINGLE_RETRIES 2
1621 /* Single sector read during recovery */
1622 static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1624 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1625 struct mmc_request *mrq = &mqrq->brq.mrq;
1626 struct mmc_card *card = mq->card;
1627 struct mmc_host *host = card->host;
1628 blk_status_t error = BLK_STS_OK;
1635 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1637 mmc_wait_for_req(host, mrq);
1639 err = mmc_send_status(card, &status);
1643 if (!mmc_host_is_spi(host) &&
1644 !mmc_ready_for_data(status)) {
1645 err = mmc_blk_fix_state(card, req);
1650 if (mrq->cmd->error && retries++ < MMC_READ_SINGLE_RETRIES)
1655 if (mrq->cmd->error ||
1657 (!mmc_host_is_spi(host) &&
1658 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1659 error = BLK_STS_IOERR;
1663 } while (blk_update_request(req, error, 512));
1668 mrq->data->bytes_xfered = 0;
1669 blk_update_request(req, BLK_STS_IOERR, 512);
1670 /* Let it try the remaining request again */
1671 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1672 mqrq->retries = MMC_MAX_RETRIES - 1;
1675 static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1677 return !!brq->mrq.sbc;
1680 static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1682 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1686 * Check for errors the host controller driver might not have seen such as
1687 * response mode errors or invalid card state.
1689 static bool mmc_blk_status_error(struct request *req, u32 status)
1691 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1692 struct mmc_blk_request *brq = &mqrq->brq;
1693 struct mmc_queue *mq = req->q->queuedata;
1696 if (mmc_host_is_spi(mq->card->host))
1699 stop_err_bits = mmc_blk_stop_err_bits(brq);
1701 return brq->cmd.resp[0] & CMD_ERRORS ||
1702 brq->stop.resp[0] & stop_err_bits ||
1703 status & stop_err_bits ||
1704 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
1707 static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1709 return !brq->sbc.error && !brq->cmd.error &&
1710 !(brq->cmd.resp[0] & CMD_ERRORS);
1714 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1716 * 1. A request that has transferred at least some data is considered
1717 * successful and will be requeued if there is remaining data to
1719 * 2. Otherwise the number of retries is incremented and the request
1720 * will be requeued if there are remaining retries.
1721 * 3. Otherwise the request will be errored out.
1722 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1723 * mqrq->retries. So there are only 4 possible actions here:
1724 * 1. do not accept the bytes_xfered value i.e. set it to zero
1725 * 2. change mqrq->retries to determine the number of retries
1726 * 3. try to reset the card
1727 * 4. read one sector at a time
1729 static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1731 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1732 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1733 struct mmc_blk_request *brq = &mqrq->brq;
1734 struct mmc_blk_data *md = mq->blkdata;
1735 struct mmc_card *card = mq->card;
1741 * Some errors the host driver might not have seen. Set the number of
1742 * bytes transferred to zero in that case.
1744 err = __mmc_send_status(card, &status, 0);
1745 if (err || mmc_blk_status_error(req, status))
1746 brq->data.bytes_xfered = 0;
1748 mmc_retune_release(card->host);
1751 * Try again to get the status. This also provides an opportunity for
1755 err = __mmc_send_status(card, &status, 0);
1758 * Nothing more to do after the number of bytes transferred has been
1759 * updated and there is no card.
1761 if (err && mmc_detect_card_removed(card->host))
1764 /* Try to get back to "tran" state */
1765 if (!mmc_host_is_spi(mq->card->host) &&
1766 (err || !mmc_ready_for_data(status)))
1767 err = mmc_blk_fix_state(mq->card, req);
1770 * Special case for SD cards where the card might record the number of
1773 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1774 rq_data_dir(req) == WRITE) {
1775 if (mmc_sd_num_wr_blocks(card, &blocks))
1776 brq->data.bytes_xfered = 0;
1778 brq->data.bytes_xfered = blocks << 9;
1781 /* Reset if the card is in a bad state */
1782 if (!mmc_host_is_spi(mq->card->host) &&
1783 err && mmc_blk_reset(md, card->host, type)) {
1784 pr_err("%s: recovery failed!\n", req->rq_disk->disk_name);
1785 mqrq->retries = MMC_NO_RETRIES;
1790 * If anything was done, just return and if there is anything remaining
1791 * on the request it will get requeued.
1793 if (brq->data.bytes_xfered)
1796 /* Reset before last retry */
1797 if (mqrq->retries + 1 == MMC_MAX_RETRIES)
1798 mmc_blk_reset(md, card->host, type);
1800 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
1801 if (brq->sbc.error || brq->cmd.error)
1804 /* Reduce the remaining retries for data errors */
1805 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
1806 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
1810 /* FIXME: Missing single sector read for large sector size */
1811 if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
1812 brq->data.blocks > 1) {
1813 /* Read one sector at a time */
1814 mmc_blk_read_single(mq, req);
1819 static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
1821 mmc_blk_eval_resp_error(brq);
1823 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
1824 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
1827 static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
1829 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1833 if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ)
1836 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status);
1839 * Do not assume data transferred correctly if there are any error bits
1842 if (status & mmc_blk_stop_err_bits(&mqrq->brq)) {
1843 mqrq->brq.data.bytes_xfered = 0;
1844 err = err ? err : -EIO;
1847 /* Copy the exception bit so it will be seen later on */
1848 if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT)
1849 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
1854 static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
1855 struct request *req)
1857 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1859 mmc_blk_reset_success(mq->blkdata, type);
1862 static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
1864 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1865 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
1868 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
1869 blk_mq_requeue_request(req, true);
1871 __blk_mq_end_request(req, BLK_STS_OK);
1872 } else if (!blk_rq_bytes(req)) {
1873 __blk_mq_end_request(req, BLK_STS_IOERR);
1874 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
1875 blk_mq_requeue_request(req, true);
1877 if (mmc_card_removed(mq->card))
1878 req->rq_flags |= RQF_QUIET;
1879 blk_mq_end_request(req, BLK_STS_IOERR);
1883 static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
1884 struct mmc_queue_req *mqrq)
1886 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
1887 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
1888 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
1891 static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
1892 struct mmc_queue_req *mqrq)
1894 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
1895 mmc_run_bkops(mq->card);
1898 static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
1900 struct mmc_queue_req *mqrq =
1901 container_of(mrq, struct mmc_queue_req, brq.mrq);
1902 struct request *req = mmc_queue_req_to_req(mqrq);
1903 struct request_queue *q = req->q;
1904 struct mmc_queue *mq = q->queuedata;
1905 struct mmc_host *host = mq->card->host;
1906 unsigned long flags;
1908 if (mmc_blk_rq_error(&mqrq->brq) ||
1909 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
1910 spin_lock_irqsave(&mq->lock, flags);
1911 mq->recovery_needed = true;
1912 mq->recovery_req = req;
1913 spin_unlock_irqrestore(&mq->lock, flags);
1915 host->cqe_ops->cqe_recovery_start(host);
1917 schedule_work(&mq->recovery_work);
1921 mmc_blk_rw_reset_success(mq, req);
1924 * Block layer timeouts race with completions which means the normal
1925 * completion path cannot be used during recovery.
1927 if (mq->in_recovery)
1928 mmc_blk_cqe_complete_rq(mq, req);
1930 blk_mq_complete_request(req);
1933 void mmc_blk_mq_complete(struct request *req)
1935 struct mmc_queue *mq = req->q->queuedata;
1938 mmc_blk_cqe_complete_rq(mq, req);
1940 mmc_blk_mq_complete_rq(mq, req);
1943 static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
1944 struct request *req)
1946 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1947 struct mmc_host *host = mq->card->host;
1949 if (mmc_blk_rq_error(&mqrq->brq) ||
1950 mmc_blk_card_busy(mq->card, req)) {
1951 mmc_blk_mq_rw_recovery(mq, req);
1953 mmc_blk_rw_reset_success(mq, req);
1954 mmc_retune_release(host);
1957 mmc_blk_urgent_bkops(mq, mqrq);
1960 static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
1962 unsigned long flags;
1965 spin_lock_irqsave(&mq->lock, flags);
1967 mq->in_flight[mmc_issue_type(mq, req)] -= 1;
1969 put_card = (mmc_tot_in_flight(mq) == 0);
1971 spin_unlock_irqrestore(&mq->lock, flags);
1974 mmc_put_card(mq->card, &mq->ctx);
1977 static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req)
1979 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1980 struct mmc_request *mrq = &mqrq->brq.mrq;
1981 struct mmc_host *host = mq->card->host;
1983 mmc_post_req(host, mrq, 0);
1986 * Block layer timeouts race with completions which means the normal
1987 * completion path cannot be used during recovery.
1989 if (mq->in_recovery)
1990 mmc_blk_mq_complete_rq(mq, req);
1992 blk_mq_complete_request(req);
1994 mmc_blk_mq_dec_in_flight(mq, req);
1997 void mmc_blk_mq_recovery(struct mmc_queue *mq)
1999 struct request *req = mq->recovery_req;
2000 struct mmc_host *host = mq->card->host;
2001 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2003 mq->recovery_req = NULL;
2004 mq->rw_wait = false;
2006 if (mmc_blk_rq_error(&mqrq->brq)) {
2007 mmc_retune_hold_now(host);
2008 mmc_blk_mq_rw_recovery(mq, req);
2011 mmc_blk_urgent_bkops(mq, mqrq);
2013 mmc_blk_mq_post_req(mq, req);
2016 static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2017 struct request **prev_req)
2019 if (mmc_host_done_complete(mq->card->host))
2022 mutex_lock(&mq->complete_lock);
2024 if (!mq->complete_req)
2027 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2030 *prev_req = mq->complete_req;
2032 mmc_blk_mq_post_req(mq, mq->complete_req);
2034 mq->complete_req = NULL;
2037 mutex_unlock(&mq->complete_lock);
2040 void mmc_blk_mq_complete_work(struct work_struct *work)
2042 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2045 mmc_blk_mq_complete_prev_req(mq, NULL);
2048 static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2050 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2052 struct request *req = mmc_queue_req_to_req(mqrq);
2053 struct request_queue *q = req->q;
2054 struct mmc_queue *mq = q->queuedata;
2055 struct mmc_host *host = mq->card->host;
2056 unsigned long flags;
2058 if (!mmc_host_done_complete(host)) {
2062 * We cannot complete the request in this context, so record
2063 * that there is a request to complete, and that a following
2064 * request does not need to wait (although it does need to
2065 * complete complete_req first).
2067 spin_lock_irqsave(&mq->lock, flags);
2068 mq->complete_req = req;
2069 mq->rw_wait = false;
2070 waiting = mq->waiting;
2071 spin_unlock_irqrestore(&mq->lock, flags);
2074 * If 'waiting' then the waiting task will complete this
2075 * request, otherwise queue a work to do it. Note that
2076 * complete_work may still race with the dispatch of a following
2082 queue_work(mq->card->complete_wq, &mq->complete_work);
2087 /* Take the recovery path for errors or urgent background operations */
2088 if (mmc_blk_rq_error(&mqrq->brq) ||
2089 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2090 spin_lock_irqsave(&mq->lock, flags);
2091 mq->recovery_needed = true;
2092 mq->recovery_req = req;
2093 spin_unlock_irqrestore(&mq->lock, flags);
2095 schedule_work(&mq->recovery_work);
2099 mmc_blk_rw_reset_success(mq, req);
2101 mq->rw_wait = false;
2104 mmc_blk_mq_post_req(mq, req);
2107 static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2109 unsigned long flags;
2113 * Wait while there is another request in progress, but not if recovery
2114 * is needed. Also indicate whether there is a request waiting to start.
2116 spin_lock_irqsave(&mq->lock, flags);
2117 if (mq->recovery_needed) {
2121 done = !mq->rw_wait;
2123 mq->waiting = !done;
2124 spin_unlock_irqrestore(&mq->lock, flags);
2129 static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2133 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2135 /* Always complete the previous request if there is one */
2136 mmc_blk_mq_complete_prev_req(mq, prev_req);
2141 static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2142 struct request *req)
2144 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2145 struct mmc_host *host = mq->card->host;
2146 struct request *prev_req = NULL;
2149 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2151 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2153 mmc_pre_req(host, &mqrq->brq.mrq);
2155 err = mmc_blk_rw_wait(mq, &prev_req);
2161 err = mmc_start_request(host, &mqrq->brq.mrq);
2164 mmc_blk_mq_post_req(mq, prev_req);
2167 mq->rw_wait = false;
2169 /* Release re-tuning here where there is no synchronization required */
2170 if (err || mmc_host_done_complete(host))
2171 mmc_retune_release(host);
2175 mmc_post_req(host, &mqrq->brq.mrq, err);
2180 static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2183 return host->cqe_ops->cqe_wait_for_idle(host);
2185 return mmc_blk_rw_wait(mq, NULL);
2188 enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2190 struct mmc_blk_data *md = mq->blkdata;
2191 struct mmc_card *card = md->queue.card;
2192 struct mmc_host *host = card->host;
2195 ret = mmc_blk_part_switch(card, md->part_type);
2197 return MMC_REQ_FAILED_TO_START;
2199 switch (mmc_issue_type(mq, req)) {
2200 case MMC_ISSUE_SYNC:
2201 ret = mmc_blk_wait_for_idle(mq, host);
2203 return MMC_REQ_BUSY;
2204 switch (req_op(req)) {
2206 case REQ_OP_DRV_OUT:
2207 mmc_blk_issue_drv_op(mq, req);
2209 case REQ_OP_DISCARD:
2210 mmc_blk_issue_discard_rq(mq, req);
2212 case REQ_OP_SECURE_ERASE:
2213 mmc_blk_issue_secdiscard_rq(mq, req);
2216 mmc_blk_issue_flush(mq, req);
2220 return MMC_REQ_FAILED_TO_START;
2222 return MMC_REQ_FINISHED;
2223 case MMC_ISSUE_DCMD:
2224 case MMC_ISSUE_ASYNC:
2225 switch (req_op(req)) {
2227 ret = mmc_blk_cqe_issue_flush(mq, req);
2232 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2234 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2241 return MMC_REQ_STARTED;
2242 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2245 return MMC_REQ_FAILED_TO_START;
2249 static inline int mmc_blk_readonly(struct mmc_card *card)
2251 return mmc_card_readonly(card) ||
2252 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2255 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2256 struct device *parent,
2259 const char *subname,
2262 struct mmc_blk_data *md;
2265 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2268 * We get -ENOSPC because there are no more any available
2269 * devidx. The reason may be that, either userspace haven't yet
2270 * unmounted the partitions, which postpones mmc_blk_release()
2271 * from being called, or the device has more partitions than
2274 if (devidx == -ENOSPC)
2275 dev_err(mmc_dev(card->host),
2276 "no more device IDs available\n");
2278 return ERR_PTR(devidx);
2281 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2287 md->area_type = area_type;
2290 * Set the read-only status based on the supported commands
2291 * and the write protect switch.
2293 md->read_only = mmc_blk_readonly(card);
2295 md->disk = alloc_disk(perdev_minors);
2296 if (md->disk == NULL) {
2301 INIT_LIST_HEAD(&md->part);
2302 INIT_LIST_HEAD(&md->rpmbs);
2305 ret = mmc_init_queue(&md->queue, card);
2309 md->queue.blkdata = md;
2312 * Keep an extra reference to the queue so that we can shutdown the
2313 * queue (i.e. call blk_cleanup_queue()) while there are still
2314 * references to the 'md'. The corresponding blk_put_queue() is in
2317 if (!blk_get_queue(md->queue.queue)) {
2318 mmc_cleanup_queue(&md->queue);
2323 md->disk->major = MMC_BLOCK_MAJOR;
2324 md->disk->first_minor = devidx * perdev_minors;
2325 md->disk->fops = &mmc_bdops;
2326 md->disk->private_data = md;
2327 md->disk->queue = md->queue.queue;
2328 md->parent = parent;
2329 set_disk_ro(md->disk, md->read_only || default_ro);
2330 md->disk->flags = GENHD_FL_EXT_DEVT;
2331 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2332 md->disk->flags |= GENHD_FL_NO_PART_SCAN
2333 | GENHD_FL_SUPPRESS_PARTITION_INFO;
2336 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2338 * - be set for removable media with permanent block devices
2339 * - be unset for removable block devices with permanent media
2341 * Since MMC block devices clearly fall under the second
2342 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2343 * should use the block device creation/destruction hotplug
2344 * messages to tell when the card is present.
2347 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2348 "mmcblk%u%s", card->host->index, subname ? subname : "");
2350 set_capacity(md->disk, size);
2352 if (mmc_host_cmd23(card->host)) {
2353 if ((mmc_card_mmc(card) &&
2354 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2355 (mmc_card_sd(card) &&
2356 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2357 md->flags |= MMC_BLK_CMD23;
2360 if (mmc_card_mmc(card) &&
2361 md->flags & MMC_BLK_CMD23 &&
2362 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2363 card->ext_csd.rel_sectors)) {
2364 md->flags |= MMC_BLK_REL_WR;
2365 blk_queue_write_cache(md->queue.queue, true, true);
2375 ida_simple_remove(&mmc_blk_ida, devidx);
2376 return ERR_PTR(ret);
2379 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2383 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2385 * The EXT_CSD sector count is in number or 512 byte
2388 size = card->ext_csd.sectors;
2391 * The CSD capacity field is in units of read_blkbits.
2392 * set_capacity takes units of 512 bytes.
2394 size = (typeof(sector_t))card->csd.capacity
2395 << (card->csd.read_blkbits - 9);
2398 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2399 MMC_BLK_DATA_AREA_MAIN);
2402 static int mmc_blk_alloc_part(struct mmc_card *card,
2403 struct mmc_blk_data *md,
2404 unsigned int part_type,
2407 const char *subname,
2411 struct mmc_blk_data *part_md;
2413 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2414 subname, area_type);
2415 if (IS_ERR(part_md))
2416 return PTR_ERR(part_md);
2417 part_md->part_type = part_type;
2418 list_add(&part_md->part, &md->part);
2420 string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2421 cap_str, sizeof(cap_str));
2422 pr_info("%s: %s %s partition %u %s\n",
2423 part_md->disk->disk_name, mmc_card_id(card),
2424 mmc_card_name(card), part_md->part_type, cap_str);
2429 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2430 * @filp: the character device file
2431 * @cmd: the ioctl() command
2432 * @arg: the argument from userspace
2434 * This will essentially just redirect the ioctl()s coming in over to
2435 * the main block device spawning the RPMB character device.
2437 static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2440 struct mmc_rpmb_data *rpmb = filp->private_data;
2445 ret = mmc_blk_ioctl_cmd(rpmb->md,
2446 (struct mmc_ioc_cmd __user *)arg,
2449 case MMC_IOC_MULTI_CMD:
2450 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2451 (struct mmc_ioc_multi_cmd __user *)arg,
2462 #ifdef CONFIG_COMPAT
2463 static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2466 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2470 static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2472 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2473 struct mmc_rpmb_data, chrdev);
2475 get_device(&rpmb->dev);
2476 filp->private_data = rpmb;
2477 mmc_blk_get(rpmb->md->disk);
2479 return nonseekable_open(inode, filp);
2482 static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2484 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2485 struct mmc_rpmb_data, chrdev);
2487 mmc_blk_put(rpmb->md);
2488 put_device(&rpmb->dev);
2493 static const struct file_operations mmc_rpmb_fileops = {
2494 .release = mmc_rpmb_chrdev_release,
2495 .open = mmc_rpmb_chrdev_open,
2496 .owner = THIS_MODULE,
2497 .llseek = no_llseek,
2498 .unlocked_ioctl = mmc_rpmb_ioctl,
2499 #ifdef CONFIG_COMPAT
2500 .compat_ioctl = mmc_rpmb_ioctl_compat,
2504 static void mmc_blk_rpmb_device_release(struct device *dev)
2506 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2508 ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
2512 static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2513 struct mmc_blk_data *md,
2514 unsigned int part_index,
2516 const char *subname)
2519 char rpmb_name[DISK_NAME_LEN];
2521 struct mmc_rpmb_data *rpmb;
2523 /* This creates the minor number for the RPMB char device */
2524 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
2528 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2530 ida_simple_remove(&mmc_rpmb_ida, devidx);
2534 snprintf(rpmb_name, sizeof(rpmb_name),
2535 "mmcblk%u%s", card->host->index, subname ? subname : "");
2538 rpmb->part_index = part_index;
2539 rpmb->dev.init_name = rpmb_name;
2540 rpmb->dev.bus = &mmc_rpmb_bus_type;
2541 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
2542 rpmb->dev.parent = &card->dev;
2543 rpmb->dev.release = mmc_blk_rpmb_device_release;
2544 device_initialize(&rpmb->dev);
2545 dev_set_drvdata(&rpmb->dev, rpmb);
2548 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
2549 rpmb->chrdev.owner = THIS_MODULE;
2550 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
2552 pr_err("%s: could not add character device\n", rpmb_name);
2553 goto out_put_device;
2556 list_add(&rpmb->node, &md->rpmbs);
2558 string_get_size((u64)size, 512, STRING_UNITS_2,
2559 cap_str, sizeof(cap_str));
2561 pr_info("%s: %s %s partition %u %s, chardev (%d:%d)\n",
2562 rpmb_name, mmc_card_id(card),
2563 mmc_card_name(card), EXT_CSD_PART_CONFIG_ACC_RPMB, cap_str,
2564 MAJOR(mmc_rpmb_devt), rpmb->id);
2569 put_device(&rpmb->dev);
2573 static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
2576 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
2577 put_device(&rpmb->dev);
2580 /* MMC Physical partitions consist of two boot partitions and
2581 * up to four general purpose partitions.
2582 * For each partition enabled in EXT_CSD a block device will be allocatedi
2583 * to provide access to the partition.
2586 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2590 if (!mmc_card_mmc(card))
2593 for (idx = 0; idx < card->nr_parts; idx++) {
2594 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
2596 * RPMB partitions does not provide block access, they
2597 * are only accessed using ioctl():s. Thus create
2598 * special RPMB block devices that do not have a
2599 * backing block queue for these.
2601 ret = mmc_blk_alloc_rpmb_part(card, md,
2602 card->part[idx].part_cfg,
2603 card->part[idx].size >> 9,
2604 card->part[idx].name);
2607 } else if (card->part[idx].size) {
2608 ret = mmc_blk_alloc_part(card, md,
2609 card->part[idx].part_cfg,
2610 card->part[idx].size >> 9,
2611 card->part[idx].force_ro,
2612 card->part[idx].name,
2613 card->part[idx].area_type);
2622 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2624 struct mmc_card *card;
2628 * Flush remaining requests and free queues. It
2629 * is freeing the queue that stops new requests
2630 * from being accepted.
2632 card = md->queue.card;
2633 if (md->disk->flags & GENHD_FL_UP) {
2634 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2635 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2636 card->ext_csd.boot_ro_lockable)
2637 device_remove_file(disk_to_dev(md->disk),
2638 &md->power_ro_lock);
2640 del_gendisk(md->disk);
2642 mmc_cleanup_queue(&md->queue);
2647 static void mmc_blk_remove_parts(struct mmc_card *card,
2648 struct mmc_blk_data *md)
2650 struct list_head *pos, *q;
2651 struct mmc_blk_data *part_md;
2652 struct mmc_rpmb_data *rpmb;
2654 /* Remove RPMB partitions */
2655 list_for_each_safe(pos, q, &md->rpmbs) {
2656 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
2658 mmc_blk_remove_rpmb_part(rpmb);
2660 /* Remove block partitions */
2661 list_for_each_safe(pos, q, &md->part) {
2662 part_md = list_entry(pos, struct mmc_blk_data, part);
2664 mmc_blk_remove_req(part_md);
2668 static int mmc_add_disk(struct mmc_blk_data *md)
2671 struct mmc_card *card = md->queue.card;
2673 device_add_disk(md->parent, md->disk, NULL);
2674 md->force_ro.show = force_ro_show;
2675 md->force_ro.store = force_ro_store;
2676 sysfs_attr_init(&md->force_ro.attr);
2677 md->force_ro.attr.name = "force_ro";
2678 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2679 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2683 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2684 card->ext_csd.boot_ro_lockable) {
2687 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2690 mode = S_IRUGO | S_IWUSR;
2692 md->power_ro_lock.show = power_ro_lock_show;
2693 md->power_ro_lock.store = power_ro_lock_store;
2694 sysfs_attr_init(&md->power_ro_lock.attr);
2695 md->power_ro_lock.attr.mode = mode;
2696 md->power_ro_lock.attr.name =
2697 "ro_lock_until_next_power_on";
2698 ret = device_create_file(disk_to_dev(md->disk),
2699 &md->power_ro_lock);
2701 goto power_ro_lock_fail;
2706 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2708 del_gendisk(md->disk);
2713 #ifdef CONFIG_DEBUG_FS
2715 static int mmc_dbg_card_status_get(void *data, u64 *val)
2717 struct mmc_card *card = data;
2718 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2719 struct mmc_queue *mq = &md->queue;
2720 struct request *req;
2723 /* Ask the block layer about the card status */
2724 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2726 return PTR_ERR(req);
2727 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
2728 blk_execute_rq(mq->queue, NULL, req, 0);
2729 ret = req_to_mmc_queue_req(req)->drv_op_result;
2734 blk_put_request(req);
2738 DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
2741 /* That is two digits * 512 + 1 for newline */
2742 #define EXT_CSD_STR_LEN 1025
2744 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
2746 struct mmc_card *card = inode->i_private;
2747 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2748 struct mmc_queue *mq = &md->queue;
2749 struct request *req;
2755 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
2759 /* Ask the block layer for the EXT CSD */
2760 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2765 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
2766 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
2767 blk_execute_rq(mq->queue, NULL, req, 0);
2768 err = req_to_mmc_queue_req(req)->drv_op_result;
2769 blk_put_request(req);
2771 pr_err("FAILED %d\n", err);
2775 for (i = 0; i < 512; i++)
2776 n += sprintf(buf + n, "%02x", ext_csd[i]);
2777 n += sprintf(buf + n, "\n");
2779 if (n != EXT_CSD_STR_LEN) {
2785 filp->private_data = buf;
2794 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
2795 size_t cnt, loff_t *ppos)
2797 char *buf = filp->private_data;
2799 return simple_read_from_buffer(ubuf, cnt, ppos,
2800 buf, EXT_CSD_STR_LEN);
2803 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
2805 kfree(file->private_data);
2809 static const struct file_operations mmc_dbg_ext_csd_fops = {
2810 .open = mmc_ext_csd_open,
2811 .read = mmc_ext_csd_read,
2812 .release = mmc_ext_csd_release,
2813 .llseek = default_llseek,
2816 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2818 struct dentry *root;
2820 if (!card->debugfs_root)
2823 root = card->debugfs_root;
2825 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
2827 debugfs_create_file_unsafe("status", 0400, root,
2829 &mmc_dbg_card_status_fops);
2830 if (!md->status_dentry)
2834 if (mmc_card_mmc(card)) {
2835 md->ext_csd_dentry =
2836 debugfs_create_file("ext_csd", S_IRUSR, root, card,
2837 &mmc_dbg_ext_csd_fops);
2838 if (!md->ext_csd_dentry)
2845 static void mmc_blk_remove_debugfs(struct mmc_card *card,
2846 struct mmc_blk_data *md)
2848 if (!card->debugfs_root)
2851 if (!IS_ERR_OR_NULL(md->status_dentry)) {
2852 debugfs_remove(md->status_dentry);
2853 md->status_dentry = NULL;
2856 if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) {
2857 debugfs_remove(md->ext_csd_dentry);
2858 md->ext_csd_dentry = NULL;
2864 static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2869 static void mmc_blk_remove_debugfs(struct mmc_card *card,
2870 struct mmc_blk_data *md)
2874 #endif /* CONFIG_DEBUG_FS */
2876 static int mmc_blk_probe(struct mmc_card *card)
2878 struct mmc_blk_data *md, *part_md;
2882 * Check that the card supports the command class(es) we need.
2884 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2887 mmc_fixup_device(card, mmc_blk_fixups);
2889 card->complete_wq = alloc_workqueue("mmc_complete",
2890 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
2891 if (unlikely(!card->complete_wq)) {
2892 pr_err("Failed to create mmc completion workqueue");
2896 md = mmc_blk_alloc(card);
2900 string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2901 cap_str, sizeof(cap_str));
2902 pr_info("%s: %s %s %s %s\n",
2903 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2904 cap_str, md->read_only ? "(ro)" : "");
2906 if (mmc_blk_alloc_parts(card, md))
2909 dev_set_drvdata(&card->dev, md);
2911 if (mmc_add_disk(md))
2914 list_for_each_entry(part_md, &md->part, part) {
2915 if (mmc_add_disk(part_md))
2919 /* Add two debugfs entries */
2920 mmc_blk_add_debugfs(card, md);
2922 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2923 pm_runtime_use_autosuspend(&card->dev);
2926 * Don't enable runtime PM for SD-combo cards here. Leave that
2927 * decision to be taken during the SDIO init sequence instead.
2929 if (card->type != MMC_TYPE_SD_COMBO) {
2930 pm_runtime_set_active(&card->dev);
2931 pm_runtime_enable(&card->dev);
2937 mmc_blk_remove_parts(card, md);
2938 mmc_blk_remove_req(md);
2942 static void mmc_blk_remove(struct mmc_card *card)
2944 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2946 mmc_blk_remove_debugfs(card, md);
2947 mmc_blk_remove_parts(card, md);
2948 pm_runtime_get_sync(&card->dev);
2949 if (md->part_curr != md->part_type) {
2950 mmc_claim_host(card->host);
2951 mmc_blk_part_switch(card, md->part_type);
2952 mmc_release_host(card->host);
2954 if (card->type != MMC_TYPE_SD_COMBO)
2955 pm_runtime_disable(&card->dev);
2956 pm_runtime_put_noidle(&card->dev);
2957 mmc_blk_remove_req(md);
2958 dev_set_drvdata(&card->dev, NULL);
2959 destroy_workqueue(card->complete_wq);
2962 static int _mmc_blk_suspend(struct mmc_card *card)
2964 struct mmc_blk_data *part_md;
2965 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2968 mmc_queue_suspend(&md->queue);
2969 list_for_each_entry(part_md, &md->part, part) {
2970 mmc_queue_suspend(&part_md->queue);
2976 static void mmc_blk_shutdown(struct mmc_card *card)
2978 _mmc_blk_suspend(card);
2981 #ifdef CONFIG_PM_SLEEP
2982 static int mmc_blk_suspend(struct device *dev)
2984 struct mmc_card *card = mmc_dev_to_card(dev);
2986 return _mmc_blk_suspend(card);
2989 static int mmc_blk_resume(struct device *dev)
2991 struct mmc_blk_data *part_md;
2992 struct mmc_blk_data *md = dev_get_drvdata(dev);
2996 * Resume involves the card going into idle state,
2997 * so current partition is always the main one.
2999 md->part_curr = md->part_type;
3000 mmc_queue_resume(&md->queue);
3001 list_for_each_entry(part_md, &md->part, part) {
3002 mmc_queue_resume(&part_md->queue);
3009 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
3011 static struct mmc_driver mmc_driver = {
3014 .pm = &mmc_blk_pm_ops,
3016 .probe = mmc_blk_probe,
3017 .remove = mmc_blk_remove,
3018 .shutdown = mmc_blk_shutdown,
3021 static int __init mmc_blk_init(void)
3025 res = bus_register(&mmc_rpmb_bus_type);
3027 pr_err("mmcblk: could not register RPMB bus type\n");
3030 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3032 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3036 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3037 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3039 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3041 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3043 goto out_chrdev_unreg;
3045 res = mmc_register_driver(&mmc_driver);
3047 goto out_blkdev_unreg;
3052 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3054 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3056 bus_unregister(&mmc_rpmb_bus_type);
3060 static void __exit mmc_blk_exit(void)
3062 mmc_unregister_driver(&mmc_driver);
3063 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3064 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3065 bus_unregister(&mmc_rpmb_bus_type);
3068 module_init(mmc_blk_init);
3069 module_exit(mmc_blk_exit);
3071 MODULE_LICENSE("GPL");
3072 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");