diff options
Diffstat (limited to 'drivers/mmc/core/block.c')
| -rw-r--r-- | drivers/mmc/core/block.c | 3224 |
1 files changed, 3224 insertions, 0 deletions
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c new file mode 100644 index 000000000..ea60efaec --- /dev/null +++ b/drivers/mmc/core/block.c @@ -0,0 +1,3224 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Block driver for media (i.e., flash cards) + * + * Copyright 2002 Hewlett-Packard Company + * Copyright 2005-2008 Pierre Ossman + * + * Use consistent with the GNU GPL is permitted, + * provided that this copyright notice is + * preserved in its entirety in all copies and derived works. + * + * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED, + * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS + * FITNESS FOR ANY PARTICULAR PURPOSE. + * + * Many thanks to Alessandro Rubini and Jonathan Corbet! + * + * Author: Andrew Christian + * 28 May 2002 + */ +#include <linux/moduleparam.h> +#include <linux/module.h> +#include <linux/init.h> + +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/hdreg.h> +#include <linux/kdev_t.h> +#include <linux/kref.h> +#include <linux/blkdev.h> +#include <linux/cdev.h> +#include <linux/mutex.h> +#include <linux/scatterlist.h> +#include <linux/string_helpers.h> +#include <linux/delay.h> +#include <linux/capability.h> +#include <linux/compat.h> +#include <linux/pm_runtime.h> +#include <linux/idr.h> +#include <linux/debugfs.h> + +#include <linux/mmc/ioctl.h> +#include <linux/mmc/card.h> +#include <linux/mmc/host.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sd.h> + +#include <linux/uaccess.h> + +#include "queue.h" +#include "block.h" +#include "core.h" +#include "card.h" +#include "crypto.h" +#include "host.h" +#include "bus.h" +#include "mmc_ops.h" +#include "quirks.h" +#include "sd_ops.h" + +MODULE_ALIAS("mmc:block"); +#ifdef MODULE_PARAM_PREFIX +#undef MODULE_PARAM_PREFIX +#endif +#define MODULE_PARAM_PREFIX "mmcblk." + +/* + * Set a 10 second timeout for polling write request busy state. Note, mmc core + * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10 + * second software timer to timeout the whole request, so 10 seconds should be + * ample. + */ +#define MMC_BLK_TIMEOUT_MS (10 * 1000) +#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16) +#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8) + +#define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \ + (rq_data_dir(req) == WRITE)) +static DEFINE_MUTEX(block_mutex); + +/* + * The defaults come from config options but can be overriden by module + * or bootarg options. + */ +static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; + +/* + * We've only got one major, so number of mmcblk devices is + * limited to (1 << 20) / number of minors per device. It is also + * limited by the MAX_DEVICES below. + */ +static int max_devices; + +#define MAX_DEVICES 256 + +static DEFINE_IDA(mmc_blk_ida); +static DEFINE_IDA(mmc_rpmb_ida); + +struct mmc_blk_busy_data { + struct mmc_card *card; + u32 status; +}; + +/* + * There is one mmc_blk_data per slot. + */ +struct mmc_blk_data { + struct device *parent; + struct gendisk *disk; + struct mmc_queue queue; + struct list_head part; + struct list_head rpmbs; + + unsigned int flags; +#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */ +#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */ + + struct kref kref; + unsigned int read_only; + unsigned int part_type; + unsigned int reset_done; +#define MMC_BLK_READ BIT(0) +#define MMC_BLK_WRITE BIT(1) +#define MMC_BLK_DISCARD BIT(2) +#define MMC_BLK_SECDISCARD BIT(3) +#define MMC_BLK_CQE_RECOVERY BIT(4) +#define MMC_BLK_TRIM BIT(5) + + /* + * Only set in main mmc_blk_data associated + * with mmc_card with dev_set_drvdata, and keeps + * track of the current selected device partition. + */ + unsigned int part_curr; +#define MMC_BLK_PART_INVALID UINT_MAX /* Unknown partition active */ + int area_type; + + /* debugfs files (only in main mmc_blk_data) */ + struct dentry *status_dentry; + struct dentry *ext_csd_dentry; +}; + +/* Device type for RPMB character devices */ +static dev_t mmc_rpmb_devt; + +/* Bus type for RPMB character devices */ +static struct bus_type mmc_rpmb_bus_type = { + .name = "mmc_rpmb", +}; + +/** + * struct mmc_rpmb_data - special RPMB device type for these areas + * @dev: the device for the RPMB area + * @chrdev: character device for the RPMB area + * @id: unique device ID number + * @part_index: partition index (0 on first) + * @md: parent MMC block device + * @node: list item, so we can put this device on a list + */ +struct mmc_rpmb_data { + struct device dev; + struct cdev chrdev; + int id; + unsigned int part_index; + struct mmc_blk_data *md; + struct list_head node; +}; + +static DEFINE_MUTEX(open_lock); + +module_param(perdev_minors, int, 0444); +MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); + +static inline int mmc_blk_part_switch(struct mmc_card *card, + unsigned int part_type); +static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, + struct mmc_card *card, + int recovery_mode, + struct mmc_queue *mq); +static void mmc_blk_hsq_req_done(struct mmc_request *mrq); +static int mmc_spi_err_check(struct mmc_card *card); +static int mmc_blk_busy_cb(void *cb_data, bool *busy); + +static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) +{ + struct mmc_blk_data *md; + + mutex_lock(&open_lock); + md = disk->private_data; + if (md && !kref_get_unless_zero(&md->kref)) + md = NULL; + mutex_unlock(&open_lock); + + return md; +} + +static inline int mmc_get_devidx(struct gendisk *disk) +{ + int devidx = disk->first_minor / perdev_minors; + return devidx; +} + +static void mmc_blk_kref_release(struct kref *ref) +{ + struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref); + int devidx; + + devidx = mmc_get_devidx(md->disk); + ida_simple_remove(&mmc_blk_ida, devidx); + + mutex_lock(&open_lock); + md->disk->private_data = NULL; + mutex_unlock(&open_lock); + + put_disk(md->disk); + kfree(md); +} + +static void mmc_blk_put(struct mmc_blk_data *md) +{ + kref_put(&md->kref, mmc_blk_kref_release); +} + +static ssize_t power_ro_lock_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int ret; + struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); + struct mmc_card *card = md->queue.card; + int locked = 0; + + if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN) + locked = 2; + else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN) + locked = 1; + + ret = snprintf(buf, PAGE_SIZE, "%d\n", locked); + + mmc_blk_put(md); + + return ret; +} + +static ssize_t power_ro_lock_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int ret; + struct mmc_blk_data *md, *part_md; + struct mmc_queue *mq; + struct request *req; + unsigned long set; + + if (kstrtoul(buf, 0, &set)) + return -EINVAL; + + if (set != 1) + return count; + + md = mmc_blk_get(dev_to_disk(dev)); + mq = &md->queue; + + /* Dispatch locking to the block layer */ + req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_OUT, 0); + if (IS_ERR(req)) { + count = PTR_ERR(req); + goto out_put; + } + req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP; + req_to_mmc_queue_req(req)->drv_op_result = -EIO; + blk_execute_rq(req, false); + ret = req_to_mmc_queue_req(req)->drv_op_result; + blk_mq_free_request(req); + + if (!ret) { + pr_info("%s: Locking boot partition ro until next power on\n", + md->disk->disk_name); + set_disk_ro(md->disk, 1); + + list_for_each_entry(part_md, &md->part, part) + if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) { + pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name); + set_disk_ro(part_md->disk, 1); + } + } +out_put: + mmc_blk_put(md); + return count; +} + +static DEVICE_ATTR(ro_lock_until_next_power_on, 0, + power_ro_lock_show, power_ro_lock_store); + +static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int ret; + struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); + + ret = snprintf(buf, PAGE_SIZE, "%d\n", + get_disk_ro(dev_to_disk(dev)) ^ + md->read_only); + mmc_blk_put(md); + return ret; +} + +static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + char *end; + struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); + unsigned long set = simple_strtoul(buf, &end, 0); + if (end == buf) { + ret = -EINVAL; + goto out; + } + + set_disk_ro(dev_to_disk(dev), set || md->read_only); + ret = count; +out: + mmc_blk_put(md); + return ret; +} + +static DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store); + +static struct attribute *mmc_disk_attrs[] = { + &dev_attr_force_ro.attr, + &dev_attr_ro_lock_until_next_power_on.attr, + NULL, +}; + +static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); + umode_t mode = a->mode; + + if (a == &dev_attr_ro_lock_until_next_power_on.attr && + (md->area_type & MMC_BLK_DATA_AREA_BOOT) && + md->queue.card->ext_csd.boot_ro_lockable) { + mode = S_IRUGO; + if (!(md->queue.card->ext_csd.boot_ro_lock & + EXT_CSD_BOOT_WP_B_PWR_WP_DIS)) + mode |= S_IWUSR; + } + + mmc_blk_put(md); + return mode; +} + +static const struct attribute_group mmc_disk_attr_group = { + .is_visible = mmc_disk_attrs_is_visible, + .attrs = mmc_disk_attrs, +}; + +static const struct attribute_group *mmc_disk_attr_groups[] = { + &mmc_disk_attr_group, + NULL, +}; + +static int mmc_blk_open(struct block_device *bdev, fmode_t mode) +{ + struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); + int ret = -ENXIO; + + mutex_lock(&block_mutex); + if (md) { + ret = 0; + if ((mode & FMODE_WRITE) && md->read_only) { + mmc_blk_put(md); + ret = -EROFS; + } + } + mutex_unlock(&block_mutex); + + return ret; +} + +static void mmc_blk_release(struct gendisk *disk, fmode_t mode) +{ + struct mmc_blk_data *md = disk->private_data; + + mutex_lock(&block_mutex); + mmc_blk_put(md); + mutex_unlock(&block_mutex); +} + +static int +mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); + geo->heads = 4; + geo->sectors = 16; + return 0; +} + +struct mmc_blk_ioc_data { + struct mmc_ioc_cmd ic; + unsigned char *buf; + u64 buf_bytes; + unsigned int flags; +#define MMC_BLK_IOC_DROP BIT(0) /* drop this mrq */ +#define MMC_BLK_IOC_SBC BIT(1) /* use mrq.sbc */ + + struct mmc_rpmb_data *rpmb; +}; + +static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user( + struct mmc_ioc_cmd __user *user) +{ + struct mmc_blk_ioc_data *idata; + int err; + + idata = kmalloc(sizeof(*idata), GFP_KERNEL); + if (!idata) { + err = -ENOMEM; + goto out; + } + + if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) { + err = -EFAULT; + goto idata_err; + } + + idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks; + if (idata->buf_bytes > MMC_IOC_MAX_BYTES) { + err = -EOVERFLOW; + goto idata_err; + } + + if (!idata->buf_bytes) { + idata->buf = NULL; + return idata; + } + + idata->buf = memdup_user((void __user *)(unsigned long) + idata->ic.data_ptr, idata->buf_bytes); + if (IS_ERR(idata->buf)) { + err = PTR_ERR(idata->buf); + goto idata_err; + } + + return idata; + +idata_err: + kfree(idata); +out: + return ERR_PTR(err); +} + +static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr, + struct mmc_blk_ioc_data *idata) +{ + struct mmc_ioc_cmd *ic = &idata->ic; + + if (copy_to_user(&(ic_ptr->response), ic->response, + sizeof(ic->response))) + return -EFAULT; + + if (!idata->ic.write_flag) { + if (copy_to_user((void __user *)(unsigned long)ic->data_ptr, + idata->buf, idata->buf_bytes)) + return -EFAULT; + } + + return 0; +} + +static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md, + struct mmc_blk_ioc_data **idatas, int i) +{ + struct mmc_command cmd = {}, sbc = {}; + struct mmc_data data = {}; + struct mmc_request mrq = {}; + struct scatterlist sg; + bool r1b_resp; + unsigned int busy_timeout_ms; + int err; + unsigned int target_part; + struct mmc_blk_ioc_data *idata = idatas[i]; + struct mmc_blk_ioc_data *prev_idata = NULL; + + if (!card || !md || !idata) + return -EINVAL; + + if (idata->flags & MMC_BLK_IOC_DROP) + return 0; + + if (idata->flags & MMC_BLK_IOC_SBC) + prev_idata = idatas[i - 1]; + + /* + * The RPMB accesses comes in from the character device, so we + * need to target these explicitly. Else we just target the + * partition type for the block device the ioctl() was issued + * on. + */ + if (idata->rpmb) { + /* Support multiple RPMB partitions */ + target_part = idata->rpmb->part_index; + target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB; + } else { + target_part = md->part_type; + } + + cmd.opcode = idata->ic.opcode; + cmd.arg = idata->ic.arg; + cmd.flags = idata->ic.flags; + + if (idata->buf_bytes) { + data.sg = &sg; + data.sg_len = 1; + data.blksz = idata->ic.blksz; + data.blocks = idata->ic.blocks; + + sg_init_one(data.sg, idata->buf, idata->buf_bytes); + + if (idata->ic.write_flag) + data.flags = MMC_DATA_WRITE; + else + data.flags = MMC_DATA_READ; + + /* data.flags must already be set before doing this. */ + mmc_set_data_timeout(&data, card); + + /* Allow overriding the timeout_ns for empirical tuning. */ + if (idata->ic.data_timeout_ns) + data.timeout_ns = idata->ic.data_timeout_ns; + + if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) { + /* + * Pretend this is a data transfer and rely on the + * host driver to compute timeout. When all host + * drivers support cmd.cmd_timeout for R1B, this + * can be changed to: + * + * mrq.data = NULL; + * cmd.cmd_timeout = idata->ic.cmd_timeout_ms; + */ + data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000; + } + + mrq.data = &data; + } + + mrq.cmd = &cmd; + + err = mmc_blk_part_switch(card, target_part); + if (err) + return err; + + if (idata->ic.is_acmd) { + err = mmc_app_cmd(card->host, card); + if (err) + return err; + } + + if (idata->rpmb || prev_idata) { + sbc.opcode = MMC_SET_BLOCK_COUNT; + /* + * We don't do any blockcount validation because the max size + * may be increased by a future standard. We just copy the + * 'Reliable Write' bit here. + */ + sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31)); + if (prev_idata) + sbc.arg = prev_idata->ic.arg; + sbc.flags = MMC_RSP_R1 | MMC_CMD_AC; + mrq.sbc = &sbc; + } + + if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) && + (cmd.opcode == MMC_SWITCH)) + return mmc_sanitize(card, idata->ic.cmd_timeout_ms); + + /* If it's an R1B response we need some more preparations. */ + busy_timeout_ms = idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS; + r1b_resp = (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B; + if (r1b_resp) + mmc_prepare_busy_cmd(card->host, &cmd, busy_timeout_ms); + + mmc_wait_for_req(card->host, &mrq); + memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp)); + + if (prev_idata) { + memcpy(&prev_idata->ic.response, sbc.resp, sizeof(sbc.resp)); + if (sbc.error) { + dev_err(mmc_dev(card->host), "%s: sbc error %d\n", + __func__, sbc.error); + return sbc.error; + } + } + + if (cmd.error) { + dev_err(mmc_dev(card->host), "%s: cmd error %d\n", + __func__, cmd.error); + return cmd.error; + } + if (data.error) { + dev_err(mmc_dev(card->host), "%s: data error %d\n", + __func__, data.error); + return data.error; + } + + /* + * Make sure the cache of the PARTITION_CONFIG register and + * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write + * changed it successfully. + */ + if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) && + (cmd.opcode == MMC_SWITCH)) { + struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev); + u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg); + + /* + * Update cache so the next mmc_blk_part_switch call operates + * on up-to-date data. + */ + card->ext_csd.part_config = value; + main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK; + } + + /* + * Make sure to update CACHE_CTRL in case it was changed. The cache + * will get turned back on if the card is re-initialized, e.g. + * suspend/resume or hw reset in recovery. + */ + if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) && + (cmd.opcode == MMC_SWITCH)) { + u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1; + + card->ext_csd.cache_ctrl = value; + } + + /* + * According to the SD specs, some commands require a delay after + * issuing the command. + */ + if (idata->ic.postsleep_min_us) + usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us); + + if (mmc_host_is_spi(card->host)) { + if (idata->ic.write_flag || r1b_resp || cmd.flags & MMC_RSP_SPI_BUSY) + return mmc_spi_err_check(card); + return err; + } + + /* + * Ensure RPMB, writes and R1B responses are completed by polling with + * CMD13. Note that, usually we don't need to poll when using HW busy + * detection, but here it's needed since some commands may indicate the + * error through the R1 status bits. + */ + if (idata->rpmb || idata->ic.write_flag || r1b_resp) { + struct mmc_blk_busy_data cb_data = { + .card = card, + }; + + err = __mmc_poll_for_busy(card->host, 0, busy_timeout_ms, + &mmc_blk_busy_cb, &cb_data); + + idata->ic.response[0] = cb_data.status; + } + + return err; +} + +static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md, + struct mmc_ioc_cmd __user *ic_ptr, + struct mmc_rpmb_data *rpmb) +{ + struct mmc_blk_ioc_data *idata; + struct mmc_blk_ioc_data *idatas[1]; + struct mmc_queue *mq; + struct mmc_card *card; + int err = 0, ioc_err = 0; + struct request *req; + + idata = mmc_blk_ioctl_copy_from_user(ic_ptr); + if (IS_ERR(idata)) + return PTR_ERR(idata); + /* This will be NULL on non-RPMB ioctl():s */ + idata->rpmb = rpmb; + + card = md->queue.card; + if (IS_ERR(card)) { + err = PTR_ERR(card); + goto cmd_done; + } + + /* + * Dispatch the ioctl() into the block request queue. + */ + mq = &md->queue; + req = blk_mq_alloc_request(mq->queue, + idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto cmd_done; + } + idatas[0] = idata; + req_to_mmc_queue_req(req)->drv_op = + rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL; + req_to_mmc_queue_req(req)->drv_op_result = -EIO; + req_to_mmc_queue_req(req)->drv_op_data = idatas; + req_to_mmc_queue_req(req)->ioc_count = 1; + blk_execute_rq(req, false); + ioc_err = req_to_mmc_queue_req(req)->drv_op_result; + err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata); + blk_mq_free_request(req); + +cmd_done: + kfree(idata->buf); + kfree(idata); + return ioc_err ? ioc_err : err; +} + +static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md, + struct mmc_ioc_multi_cmd __user *user, + struct mmc_rpmb_data *rpmb) +{ + struct mmc_blk_ioc_data **idata = NULL; + struct mmc_ioc_cmd __user *cmds = user->cmds; + struct mmc_card *card; + struct mmc_queue *mq; + int err = 0, ioc_err = 0; + __u64 num_of_cmds; + unsigned int i, n; + struct request *req; + + if (copy_from_user(&num_of_cmds, &user->num_of_cmds, + sizeof(num_of_cmds))) + return -EFAULT; + + if (!num_of_cmds) + return 0; + + if (num_of_cmds > MMC_IOC_MAX_CMDS) + return -EINVAL; + + n = num_of_cmds; + idata = kcalloc(n, sizeof(*idata), GFP_KERNEL); + if (!idata) + return -ENOMEM; + + for (i = 0; i < n; i++) { + idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]); + if (IS_ERR(idata[i])) { + err = PTR_ERR(idata[i]); + n = i; + goto cmd_err; + } + /* This will be NULL on non-RPMB ioctl():s */ + idata[i]->rpmb = rpmb; + } + + card = md->queue.card; + if (IS_ERR(card)) { + err = PTR_ERR(card); + goto cmd_err; + } + + + /* + * Dispatch the ioctl()s into the block request queue. + */ + mq = &md->queue; + req = blk_mq_alloc_request(mq->queue, + idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto cmd_err; + } + req_to_mmc_queue_req(req)->drv_op = + rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL; + req_to_mmc_queue_req(req)->drv_op_result = -EIO; + req_to_mmc_queue_req(req)->drv_op_data = idata; + req_to_mmc_queue_req(req)->ioc_count = n; + blk_execute_rq(req, false); + ioc_err = req_to_mmc_queue_req(req)->drv_op_result; + + /* copy to user if data and response */ + for (i = 0; i < n && !err; i++) + err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]); + + blk_mq_free_request(req); + +cmd_err: + for (i = 0; i < n; i++) { + kfree(idata[i]->buf); + kfree(idata[i]); + } + kfree(idata); + return ioc_err ? ioc_err : err; +} + +static int mmc_blk_check_blkdev(struct block_device *bdev) +{ + /* + * The caller must have CAP_SYS_RAWIO, and must be calling this on the + * whole block device, not on a partition. This prevents overspray + * between sibling partitions. + */ + if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev)) + return -EPERM; + return 0; +} + +static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + struct mmc_blk_data *md; + int ret; + + switch (cmd) { + case MMC_IOC_CMD: + ret = mmc_blk_check_blkdev(bdev); + if (ret) + return ret; + md = mmc_blk_get(bdev->bd_disk); + if (!md) + return -EINVAL; + ret = mmc_blk_ioctl_cmd(md, + (struct mmc_ioc_cmd __user *)arg, + NULL); + mmc_blk_put(md); + return ret; + case MMC_IOC_MULTI_CMD: + ret = mmc_blk_check_blkdev(bdev); + if (ret) + return ret; + md = mmc_blk_get(bdev->bd_disk); + if (!md) + return -EINVAL; + ret = mmc_blk_ioctl_multi_cmd(md, + (struct mmc_ioc_multi_cmd __user *)arg, + NULL); + mmc_blk_put(md); + return ret; + default: + return -EINVAL; + } +} + +#ifdef CONFIG_COMPAT +static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg)); +} +#endif + +static int mmc_blk_alternative_gpt_sector(struct gendisk *disk, + sector_t *sector) +{ + struct mmc_blk_data *md; + int ret; + + md = mmc_blk_get(disk); + if (!md) + return -EINVAL; + + if (md->queue.card) + ret = mmc_card_alternative_gpt_sector(md->queue.card, sector); + else + ret = -ENODEV; + + mmc_blk_put(md); + + return ret; +} + +static const struct block_device_operations mmc_bdops = { + .open = mmc_blk_open, + .release = mmc_blk_release, + .getgeo = mmc_blk_getgeo, + .owner = THIS_MODULE, + .ioctl = mmc_blk_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = mmc_blk_compat_ioctl, +#endif + .alternative_gpt_sector = mmc_blk_alternative_gpt_sector, +}; + +static int mmc_blk_part_switch_pre(struct mmc_card *card, + unsigned int part_type) +{ + const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB; + int ret = 0; + + if ((part_type & mask) == mask) { + if (card->ext_csd.cmdq_en) { + ret = mmc_cmdq_disable(card); + if (ret) + return ret; + } + mmc_retune_pause(card->host); + } + + return ret; +} + +static int mmc_blk_part_switch_post(struct mmc_card *card, + unsigned int part_type) +{ + const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB; + int ret = 0; + + if ((part_type & mask) == mask) { + mmc_retune_unpause(card->host); + if (card->reenable_cmdq && !card->ext_csd.cmdq_en) + ret = mmc_cmdq_enable(card); + } + + return ret; +} + +static inline int mmc_blk_part_switch(struct mmc_card *card, + unsigned int part_type) +{ + int ret = 0; + struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev); + + if (main_md->part_curr == part_type) + return 0; + + if (mmc_card_mmc(card)) { + u8 part_config = card->ext_csd.part_config; + + ret = mmc_blk_part_switch_pre(card, part_type); + if (ret) + return ret; + + part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; + part_config |= part_type; + + ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_PART_CONFIG, part_config, + card->ext_csd.part_time); + if (ret) { + mmc_blk_part_switch_post(card, part_type); + return ret; + } + + card->ext_csd.part_config = part_config; + + ret = mmc_blk_part_switch_post(card, main_md->part_curr); + } + + main_md->part_curr = part_type; + return ret; +} + +static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) +{ + int err; + u32 result; + __be32 *blocks; + + struct mmc_request mrq = {}; + struct mmc_command cmd = {}; + struct mmc_data data = {}; + + struct scatterlist sg; + + cmd.opcode = MMC_APP_CMD; + cmd.arg = card->rca << 16; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; + + err = mmc_wait_for_cmd(card->host, &cmd, 0); + if (err) + return err; + if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) + return -EIO; + + memset(&cmd, 0, sizeof(struct mmc_command)); + + cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; + cmd.arg = 0; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; + + data.blksz = 4; + data.blocks = 1; + data.flags = MMC_DATA_READ; + data.sg = &sg; + data.sg_len = 1; + mmc_set_data_timeout(&data, card); + + mrq.cmd = &cmd; + mrq.data = &data; + + blocks = kmalloc(4, GFP_KERNEL); + if (!blocks) + return -ENOMEM; + + sg_init_one(&sg, blocks, 4); + + mmc_wait_for_req(card->host, &mrq); + + result = ntohl(*blocks); + kfree(blocks); + + if (cmd.error || data.error) + return -EIO; + + *written_blocks = result; + + return 0; +} + +static unsigned int mmc_blk_clock_khz(struct mmc_host *host) +{ + if (host->actual_clock) + return host->actual_clock / 1000; + + /* Clock may be subject to a divisor, fudge it by a factor of 2. */ + if (host->ios.clock) + return host->ios.clock / 2000; + + /* How can there be no clock */ + WARN_ON_ONCE(1); + return 100; /* 100 kHz is minimum possible value */ +} + +static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host, + struct mmc_data *data) +{ + unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000); + unsigned int khz; + + if (data->timeout_clks) { + khz = mmc_blk_clock_khz(host); + ms += DIV_ROUND_UP(data->timeout_clks, khz); + } + + return ms; +} + +/* + * Attempts to reset the card and get back to the requested partition. + * Therefore any error here must result in cancelling the block layer + * request, it must not be reattempted without going through the mmc_blk + * partition sanity checks. + */ +static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host, + int type) +{ + int err; + struct mmc_blk_data *main_md = dev_get_drvdata(&host->card->dev); + + if (md->reset_done & type) + return -EEXIST; + + md->reset_done |= type; + err = mmc_hw_reset(host->card); + /* + * A successful reset will leave the card in the main partition, but + * upon failure it might not be, so set it to MMC_BLK_PART_INVALID + * in that case. + */ + main_md->part_curr = err ? MMC_BLK_PART_INVALID : main_md->part_type; + if (err) + return err; + /* Ensure we switch back to the correct partition */ + if (mmc_blk_part_switch(host->card, md->part_type)) + /* + * We have failed to get back into the correct + * partition, so we need to abort the whole request. + */ + return -ENODEV; + return 0; +} + +static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type) +{ + md->reset_done &= ~type; +} + +static void mmc_blk_check_sbc(struct mmc_queue_req *mq_rq) +{ + struct mmc_blk_ioc_data **idata = mq_rq->drv_op_data; + int i; + + for (i = 1; i < mq_rq->ioc_count; i++) { + if (idata[i - 1]->ic.opcode == MMC_SET_BLOCK_COUNT && + mmc_op_multi(idata[i]->ic.opcode)) { + idata[i - 1]->flags |= MMC_BLK_IOC_DROP; + idata[i]->flags |= MMC_BLK_IOC_SBC; + } + } +} + +/* + * The non-block commands come back from the block layer after it queued it and + * processed it with all other requests and then they get issued in this + * function. + */ +static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mq_rq; + struct mmc_card *card = mq->card; + struct mmc_blk_data *md = mq->blkdata; + struct mmc_blk_ioc_data **idata; + bool rpmb_ioctl; + u8 **ext_csd; + u32 status; + int ret; + int i; + + mq_rq = req_to_mmc_queue_req(req); + rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB); + + switch (mq_rq->drv_op) { + case MMC_DRV_OP_IOCTL: + if (card->ext_csd.cmdq_en) { + ret = mmc_cmdq_disable(card); + if (ret) + break; + } + + mmc_blk_check_sbc(mq_rq); + + fallthrough; + case MMC_DRV_OP_IOCTL_RPMB: + idata = mq_rq->drv_op_data; + for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) { + ret = __mmc_blk_ioctl_cmd(card, md, idata, i); + if (ret) + break; + } + /* Always switch back to main area after RPMB access */ + if (rpmb_ioctl) + mmc_blk_part_switch(card, 0); + else if (card->reenable_cmdq && !card->ext_csd.cmdq_en) + mmc_cmdq_enable(card); + break; + case MMC_DRV_OP_BOOT_WP: + ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP, + card->ext_csd.boot_ro_lock | + EXT_CSD_BOOT_WP_B_PWR_WP_EN, + card->ext_csd.part_time); + if (ret) + pr_err("%s: Locking boot partition ro until next power on failed: %d\n", + md->disk->disk_name, ret); + else + card->ext_csd.boot_ro_lock |= + EXT_CSD_BOOT_WP_B_PWR_WP_EN; + break; + case MMC_DRV_OP_GET_CARD_STATUS: + ret = mmc_send_status(card, &status); + if (!ret) + ret = status; + break; + case MMC_DRV_OP_GET_EXT_CSD: + ext_csd = mq_rq->drv_op_data; + ret = mmc_get_ext_csd(card, ext_csd); + break; + default: + pr_err("%s: unknown driver specific operation\n", + md->disk->disk_name); + ret = -EINVAL; + break; + } + mq_rq->drv_op_result = ret; + blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK); +} + +static void mmc_blk_issue_erase_rq(struct mmc_queue *mq, struct request *req, + int type, unsigned int erase_arg) +{ + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = md->queue.card; + unsigned int from, nr; + int err = 0; + blk_status_t status = BLK_STS_OK; + + if (!mmc_can_erase(card)) { + status = BLK_STS_NOTSUPP; + goto fail; + } + + from = blk_rq_pos(req); + nr = blk_rq_sectors(req); + + do { + err = 0; + if (card->quirks & MMC_QUIRK_INAND_CMD38) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + INAND_CMD38_ARG_EXT_CSD, + erase_arg == MMC_TRIM_ARG ? + INAND_CMD38_ARG_TRIM : + INAND_CMD38_ARG_ERASE, + card->ext_csd.generic_cmd6_time); + } + if (!err) + err = mmc_erase(card, from, nr, erase_arg); + } while (err == -EIO && !mmc_blk_reset(md, card->host, type)); + if (err) + status = BLK_STS_IOERR; + else + mmc_blk_reset_success(md, type); +fail: + blk_mq_end_request(req, status); +} + +static void mmc_blk_issue_trim_rq(struct mmc_queue *mq, struct request *req) +{ + mmc_blk_issue_erase_rq(mq, req, MMC_BLK_TRIM, MMC_TRIM_ARG); +} + +static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = md->queue.card; + unsigned int arg = card->erase_arg; + + if (mmc_card_broken_sd_discard(card)) + arg = SD_ERASE_ARG; + + mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, arg); +} + +static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, + struct request *req) +{ + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = md->queue.card; + unsigned int from, nr, arg; + int err = 0, type = MMC_BLK_SECDISCARD; + blk_status_t status = BLK_STS_OK; + + if (!(mmc_can_secure_erase_trim(card))) { + status = BLK_STS_NOTSUPP; + goto out; + } + + from = blk_rq_pos(req); + nr = blk_rq_sectors(req); + + if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) + arg = MMC_SECURE_TRIM1_ARG; + else + arg = MMC_SECURE_ERASE_ARG; + +retry: + if (card->quirks & MMC_QUIRK_INAND_CMD38) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + INAND_CMD38_ARG_EXT_CSD, + arg == MMC_SECURE_TRIM1_ARG ? + INAND_CMD38_ARG_SECTRIM1 : + INAND_CMD38_ARG_SECERASE, + card->ext_csd.generic_cmd6_time); + if (err) + goto out_retry; + } + + err = mmc_erase(card, from, nr, arg); + if (err == -EIO) + goto out_retry; + if (err) { + status = BLK_STS_IOERR; + goto out; + } + + if (arg == MMC_SECURE_TRIM1_ARG) { + if (card->quirks & MMC_QUIRK_INAND_CMD38) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + INAND_CMD38_ARG_EXT_CSD, + INAND_CMD38_ARG_SECTRIM2, + card->ext_csd.generic_cmd6_time); + if (err) + goto out_retry; + } + + err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); + if (err == -EIO) + goto out_retry; + if (err) { + status = BLK_STS_IOERR; + goto out; + } + } + +out_retry: + if (err && !mmc_blk_reset(md, card->host, type)) + goto retry; + if (!err) + mmc_blk_reset_success(md, type); +out: + blk_mq_end_request(req, status); +} + +static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req) +{ + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = md->queue.card; + int ret = 0; + + ret = mmc_flush_cache(card->host); + blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK); +} + +/* + * Reformat current write as a reliable write, supporting + * both legacy and the enhanced reliable write MMC cards. + * In each transfer we'll handle only as much as a single + * reliable write can handle, thus finish the request in + * partial completions. + */ +static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq, + struct mmc_card *card, + struct request *req) +{ + if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) { + /* Legacy mode imposes restrictions on transfers. */ + if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors)) + brq->data.blocks = 1; + + if (brq->data.blocks > card->ext_csd.rel_sectors) + brq->data.blocks = card->ext_csd.rel_sectors; + else if (brq->data.blocks < card->ext_csd.rel_sectors) + brq->data.blocks = 1; + } +} + +#define CMD_ERRORS_EXCL_OOR \ + (R1_ADDRESS_ERROR | /* Misaligned address */ \ + R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\ + R1_WP_VIOLATION | /* Tried to write to protected block */ \ + R1_CARD_ECC_FAILED | /* Card ECC failed */ \ + R1_CC_ERROR | /* Card controller error */ \ + R1_ERROR) /* General/unknown error */ + +#define CMD_ERRORS \ + (CMD_ERRORS_EXCL_OOR | \ + R1_OUT_OF_RANGE) /* Command argument out of range */ \ + +static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq) +{ + u32 val; + + /* + * Per the SD specification(physical layer version 4.10)[1], + * section 4.3.3, it explicitly states that "When the last + * block of user area is read using CMD18, the host should + * ignore OUT_OF_RANGE error that may occur even the sequence + * is correct". And JESD84-B51 for eMMC also has a similar + * statement on section 6.8.3. + * + * Multiple block read/write could be done by either predefined + * method, namely CMD23, or open-ending mode. For open-ending mode, + * we should ignore the OUT_OF_RANGE error as it's normal behaviour. + * + * However the spec[1] doesn't tell us whether we should also + * ignore that for predefined method. But per the spec[1], section + * 4.15 Set Block Count Command, it says"If illegal block count + * is set, out of range error will be indicated during read/write + * operation (For example, data transfer is stopped at user area + * boundary)." In another word, we could expect a out of range error + * in the response for the following CMD18/25. And if argument of + * CMD23 + the argument of CMD18/25 exceed the max number of blocks, + * we could also expect to get a -ETIMEDOUT or any error number from + * the host drivers due to missing data response(for write)/data(for + * read), as the cards will stop the data transfer by itself per the + * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode. + */ + + if (!brq->stop.error) { + bool oor_with_open_end; + /* If there is no error yet, check R1 response */ + + val = brq->stop.resp[0] & CMD_ERRORS; + oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc; + + if (val && !oor_with_open_end) + brq->stop.error = -EIO; + } +} + +static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq, + int recovery_mode, bool *do_rel_wr_p, + bool *do_data_tag_p) +{ + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = md->queue.card; + struct mmc_blk_request *brq = &mqrq->brq; + struct request *req = mmc_queue_req_to_req(mqrq); + bool do_rel_wr, do_data_tag; + + /* + * Reliable writes are used to implement Forced Unit Access and + * are supported only on MMCs. + */ + do_rel_wr = (req->cmd_flags & REQ_FUA) && + rq_data_dir(req) == WRITE && + (md->flags & MMC_BLK_REL_WR); + + memset(brq, 0, sizeof(struct mmc_blk_request)); + + mmc_crypto_prepare_req(mqrq); + + brq->mrq.data = &brq->data; + brq->mrq.tag = req->tag; + + brq->stop.opcode = MMC_STOP_TRANSMISSION; + brq->stop.arg = 0; + + if (rq_data_dir(req) == READ) { + brq->data.flags = MMC_DATA_READ; + brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; + } else { + brq->data.flags = MMC_DATA_WRITE; + brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; + } + + brq->data.blksz = 512; + brq->data.blocks = blk_rq_sectors(req); + brq->data.blk_addr = blk_rq_pos(req); + + /* + * The command queue supports 2 priorities: "high" (1) and "simple" (0). + * The eMMC will give "high" priority tasks priority over "simple" + * priority tasks. Here we always set "simple" priority by not setting + * MMC_DATA_PRIO. + */ + + /* + * The block layer doesn't support all sector count + * restrictions, so we need to be prepared for too big + * requests. + */ + if (brq->data.blocks > card->host->max_blk_count) + brq->data.blocks = card->host->max_blk_count; + + if (brq->data.blocks > 1) { + /* + * Some SD cards in SPI mode return a CRC error or even lock up + * completely when trying to read the last block using a + * multiblock read command. + */ + if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) && + (blk_rq_pos(req) + blk_rq_sectors(req) == + get_capacity(md->disk))) + brq->data.blocks--; + + /* + * After a read error, we redo the request one (native) sector + * at a time in order to accurately determine which + * sectors can be read successfully. + */ + if (recovery_mode) + brq->data.blocks = queue_physical_block_size(mq->queue) >> 9; + + /* + * Some controllers have HW issues while operating + * in multiple I/O mode + */ + if (card->host->ops->multi_io_quirk) + brq->data.blocks = card->host->ops->multi_io_quirk(card, + (rq_data_dir(req) == READ) ? + MMC_DATA_READ : MMC_DATA_WRITE, + brq->data.blocks); + } + + if (do_rel_wr) { + mmc_apply_rel_rw(brq, card, req); + brq->data.flags |= MMC_DATA_REL_WR; + } + + /* + * Data tag is used only during writing meta data to speed + * up write and any subsequent read of this meta data + */ + do_data_tag = card->ext_csd.data_tag_unit_size && + (req->cmd_flags & REQ_META) && + (rq_data_dir(req) == WRITE) && + ((brq->data.blocks * brq->data.blksz) >= + card->ext_csd.data_tag_unit_size); + + if (do_data_tag) + brq->data.flags |= MMC_DATA_DAT_TAG; + + mmc_set_data_timeout(&brq->data, card); + + brq->data.sg = mqrq->sg; + brq->data.sg_len = mmc_queue_map_sg(mq, mqrq); + + /* + * Adjust the sg list so it is the same size as the + * request. + */ + if (brq->data.blocks != blk_rq_sectors(req)) { + int i, data_size = brq->data.blocks << 9; + struct scatterlist *sg; + + for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) { + data_size -= sg->length; + if (data_size <= 0) { + sg->length += data_size; + i++; + break; + } + } + brq->data.sg_len = i; + } + + if (do_rel_wr_p) + *do_rel_wr_p = do_rel_wr; + + if (do_data_tag_p) + *do_data_tag_p = do_data_tag; +} + +#define MMC_CQE_RETRIES 2 + +static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_request *mrq = &mqrq->brq.mrq; + struct request_queue *q = req->q; + struct mmc_host *host = mq->card->host; + enum mmc_issue_type issue_type = mmc_issue_type(mq, req); + unsigned long flags; + bool put_card; + int err; + + mmc_cqe_post_req(host, mrq); + + if (mrq->cmd && mrq->cmd->error) + err = mrq->cmd->error; + else if (mrq->data && mrq->data->error) + err = mrq->data->error; + else + err = 0; + + if (err) { + if (mqrq->retries++ < MMC_CQE_RETRIES) + blk_mq_requeue_request(req, true); + else + blk_mq_end_request(req, BLK_STS_IOERR); + } else if (mrq->data) { + if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered)) + blk_mq_requeue_request(req, true); + else + __blk_mq_end_request(req, BLK_STS_OK); + } else if (mq->in_recovery) { + blk_mq_requeue_request(req, true); + } else { + blk_mq_end_request(req, BLK_STS_OK); + } + + spin_lock_irqsave(&mq->lock, flags); + + mq->in_flight[issue_type] -= 1; + + put_card = (mmc_tot_in_flight(mq) == 0); + + mmc_cqe_check_busy(mq); + + spin_unlock_irqrestore(&mq->lock, flags); + + if (!mq->cqe_busy) + blk_mq_run_hw_queues(q, true); + + if (put_card) + mmc_put_card(mq->card, &mq->ctx); +} + +void mmc_blk_cqe_recovery(struct mmc_queue *mq) +{ + struct mmc_card *card = mq->card; + struct mmc_host *host = card->host; + int err; + + pr_debug("%s: CQE recovery start\n", mmc_hostname(host)); + + err = mmc_cqe_recovery(host); + if (err) + mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY); + mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY); + + pr_debug("%s: CQE recovery done\n", mmc_hostname(host)); +} + +static void mmc_blk_cqe_req_done(struct mmc_request *mrq) +{ + struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req, + brq.mrq); + struct request *req = mmc_queue_req_to_req(mqrq); + struct request_queue *q = req->q; + struct mmc_queue *mq = q->queuedata; + + /* + * Block layer timeouts race with completions which means the normal + * completion path cannot be used during recovery. + */ + if (mq->in_recovery) + mmc_blk_cqe_complete_rq(mq, req); + else if (likely(!blk_should_fake_timeout(req->q))) + blk_mq_complete_request(req); +} + +static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq) +{ + mrq->done = mmc_blk_cqe_req_done; + mrq->recovery_notifier = mmc_cqe_recovery_notifier; + + return mmc_cqe_start_req(host, mrq); +} + +static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq, + struct request *req) +{ + struct mmc_blk_request *brq = &mqrq->brq; + + memset(brq, 0, sizeof(*brq)); + + brq->mrq.cmd = &brq->cmd; + brq->mrq.tag = req->tag; + + return &brq->mrq; +} + +static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req); + + mrq->cmd->opcode = MMC_SWITCH; + mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | + (EXT_CSD_FLUSH_CACHE << 16) | + (1 << 8) | + EXT_CSD_CMD_SET_NORMAL; + mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B; + + return mmc_blk_cqe_start_req(mq->card->host, mrq); +} + +static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_host *host = mq->card->host; + int err; + + mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq); + mqrq->brq.mrq.done = mmc_blk_hsq_req_done; + mmc_pre_req(host, &mqrq->brq.mrq); + + err = mmc_cqe_start_req(host, &mqrq->brq.mrq); + if (err) + mmc_post_req(host, &mqrq->brq.mrq, err); + + return err; +} + +static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_host *host = mq->card->host; + + if (host->hsq_enabled) + return mmc_blk_hsq_issue_rw_rq(mq, req); + + mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL); + + return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq); +} + +static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, + struct mmc_card *card, + int recovery_mode, + struct mmc_queue *mq) +{ + u32 readcmd, writecmd; + struct mmc_blk_request *brq = &mqrq->brq; + struct request *req = mmc_queue_req_to_req(mqrq); + struct mmc_blk_data *md = mq->blkdata; + bool do_rel_wr, do_data_tag; + + mmc_blk_data_prep(mq, mqrq, recovery_mode, &do_rel_wr, &do_data_tag); + + brq->mrq.cmd = &brq->cmd; + + brq->cmd.arg = blk_rq_pos(req); + if (!mmc_card_blockaddr(card)) + brq->cmd.arg <<= 9; + brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; + + if (brq->data.blocks > 1 || do_rel_wr) { + /* SPI multiblock writes terminate using a special + * token, not a STOP_TRANSMISSION request. + */ + if (!mmc_host_is_spi(card->host) || + rq_data_dir(req) == READ) + brq->mrq.stop = &brq->stop; + readcmd = MMC_READ_MULTIPLE_BLOCK; + writecmd = MMC_WRITE_MULTIPLE_BLOCK; + } else { + brq->mrq.stop = NULL; + readcmd = MMC_READ_SINGLE_BLOCK; + writecmd = MMC_WRITE_BLOCK; + } + brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd; + + /* + * Pre-defined multi-block transfers are preferable to + * open ended-ones (and necessary for reliable writes). + * However, it is not sufficient to just send CMD23, + * and avoid the final CMD12, as on an error condition + * CMD12 (stop) needs to be sent anyway. This, coupled + * with Auto-CMD23 enhancements provided by some + * hosts, means that the complexity of dealing + * with this is best left to the host. If CMD23 is + * supported by card and host, we'll fill sbc in and let + * the host deal with handling it correctly. This means + * that for hosts that don't expose MMC_CAP_CMD23, no + * change of behavior will be observed. + * + * N.B: Some MMC cards experience perf degradation. + * We'll avoid using CMD23-bounded multiblock writes for + * these, while retaining features like reliable writes. + */ + if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) && + (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) || + do_data_tag)) { + brq->sbc.opcode = MMC_SET_BLOCK_COUNT; + brq->sbc.arg = brq->data.blocks | + (do_rel_wr ? (1 << 31) : 0) | + (do_data_tag ? (1 << 29) : 0); + brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC; + brq->mrq.sbc = &brq->sbc; + } +} + +#define MMC_MAX_RETRIES 5 +#define MMC_DATA_RETRIES 2 +#define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1) + +static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout) +{ + struct mmc_command cmd = { + .opcode = MMC_STOP_TRANSMISSION, + .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC, + /* Some hosts wait for busy anyway, so provide a busy timeout */ + .busy_timeout = timeout, + }; + + return mmc_wait_for_cmd(card->host, &cmd, 5); +} + +static int mmc_blk_fix_state(struct mmc_card *card, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_blk_request *brq = &mqrq->brq; + unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data); + int err; + + mmc_retune_hold_now(card->host); + + mmc_blk_send_stop(card, timeout); + + err = mmc_poll_for_busy(card, timeout, false, MMC_BUSY_IO); + + mmc_retune_release(card->host); + + return err; +} + +#define MMC_READ_SINGLE_RETRIES 2 + +/* Single (native) sector read during recovery */ +static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_request *mrq = &mqrq->brq.mrq; + struct mmc_card *card = mq->card; + struct mmc_host *host = card->host; + blk_status_t error = BLK_STS_OK; + size_t bytes_per_read = queue_physical_block_size(mq->queue); + + do { + u32 status; + int err; + int retries = 0; + + while (retries++ <= MMC_READ_SINGLE_RETRIES) { + mmc_blk_rw_rq_prep(mqrq, card, 1, mq); + + mmc_wait_for_req(host, mrq); + + err = mmc_send_status(card, &status); + if (err) + goto error_exit; + + if (!mmc_host_is_spi(host) && + !mmc_ready_for_data(status)) { + err = mmc_blk_fix_state(card, req); + if (err) + goto error_exit; + } + + if (!mrq->cmd->error) + break; + } + + if (mrq->cmd->error || + mrq->data->error || + (!mmc_host_is_spi(host) && + (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS))) + error = BLK_STS_IOERR; + else + error = BLK_STS_OK; + + } while (blk_update_request(req, error, bytes_per_read)); + + return; + +error_exit: + mrq->data->bytes_xfered = 0; + blk_update_request(req, BLK_STS_IOERR, bytes_per_read); + /* Let it try the remaining request again */ + if (mqrq->retries > MMC_MAX_RETRIES - 1) + mqrq->retries = MMC_MAX_RETRIES - 1; +} + +static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq) +{ + return !!brq->mrq.sbc; +} + +static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq) +{ + return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR; +} + +/* + * Check for errors the host controller driver might not have seen such as + * response mode errors or invalid card state. + */ +static bool mmc_blk_status_error(struct request *req, u32 status) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_blk_request *brq = &mqrq->brq; + struct mmc_queue *mq = req->q->queuedata; + u32 stop_err_bits; + + if (mmc_host_is_spi(mq->card->host)) + return false; + + stop_err_bits = mmc_blk_stop_err_bits(brq); + + return brq->cmd.resp[0] & CMD_ERRORS || + brq->stop.resp[0] & stop_err_bits || + status & stop_err_bits || + (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status)); +} + +static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq) +{ + return !brq->sbc.error && !brq->cmd.error && + !(brq->cmd.resp[0] & CMD_ERRORS); +} + +/* + * Requests are completed by mmc_blk_mq_complete_rq() which sets simple + * policy: + * 1. A request that has transferred at least some data is considered + * successful and will be requeued if there is remaining data to + * transfer. + * 2. Otherwise the number of retries is incremented and the request + * will be requeued if there are remaining retries. + * 3. Otherwise the request will be errored out. + * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and + * mqrq->retries. So there are only 4 possible actions here: + * 1. do not accept the bytes_xfered value i.e. set it to zero + * 2. change mqrq->retries to determine the number of retries + * 3. try to reset the card + * 4. read one sector at a time + */ +static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req) +{ + int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE; + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_blk_request *brq = &mqrq->brq; + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = mq->card; + u32 status; + u32 blocks; + int err; + + /* + * Some errors the host driver might not have seen. Set the number of + * bytes transferred to zero in that case. + */ + err = __mmc_send_status(card, &status, 0); + if (err || mmc_blk_status_error(req, status)) + brq->data.bytes_xfered = 0; + + mmc_retune_release(card->host); + + /* + * Try again to get the status. This also provides an opportunity for + * re-tuning. + */ + if (err) + err = __mmc_send_status(card, &status, 0); + + /* + * Nothing more to do after the number of bytes transferred has been + * updated and there is no card. + */ + if (err && mmc_detect_card_removed(card->host)) + return; + + /* Try to get back to "tran" state */ + if (!mmc_host_is_spi(mq->card->host) && + (err || !mmc_ready_for_data(status))) + err = mmc_blk_fix_state(mq->card, req); + + /* + * Special case for SD cards where the card might record the number of + * blocks written. + */ + if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) && + rq_data_dir(req) == WRITE) { + if (mmc_sd_num_wr_blocks(card, &blocks)) + brq->data.bytes_xfered = 0; + else + brq->data.bytes_xfered = blocks << 9; + } + + /* Reset if the card is in a bad state */ + if (!mmc_host_is_spi(mq->card->host) && + err && mmc_blk_reset(md, card->host, type)) { + pr_err("%s: recovery failed!\n", req->q->disk->disk_name); + mqrq->retries = MMC_NO_RETRIES; + return; + } + + /* + * If anything was done, just return and if there is anything remaining + * on the request it will get requeued. + */ + if (brq->data.bytes_xfered) + return; + + /* Reset before last retry */ + if (mqrq->retries + 1 == MMC_MAX_RETRIES && + mmc_blk_reset(md, card->host, type)) + return; + + /* Command errors fail fast, so use all MMC_MAX_RETRIES */ + if (brq->sbc.error || brq->cmd.error) + return; + + /* Reduce the remaining retries for data errors */ + if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) { + mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES; + return; + } + + if (rq_data_dir(req) == READ && brq->data.blocks > + queue_physical_block_size(mq->queue) >> 9) { + /* Read one (native) sector at a time */ + mmc_blk_read_single(mq, req); + return; + } +} + +static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq) +{ + mmc_blk_eval_resp_error(brq); + + return brq->sbc.error || brq->cmd.error || brq->stop.error || + brq->data.error || brq->cmd.resp[0] & CMD_ERRORS; +} + +static int mmc_spi_err_check(struct mmc_card *card) +{ + u32 status = 0; + int err; + + /* + * SPI does not have a TRAN state we have to wait on, instead the + * card is ready again when it no longer holds the line LOW. + * We still have to ensure two things here before we know the write + * was successful: + * 1. The card has not disconnected during busy and we actually read our + * own pull-up, thinking it was still connected, so ensure it + * still responds. + * 2. Check for any error bits, in particular R1_SPI_IDLE to catch a + * just reconnected card after being disconnected during busy. + */ + err = __mmc_send_status(card, &status, 0); + if (err) + return err; + /* All R1 and R2 bits of SPI are errors in our case */ + if (status) + return -EIO; + return 0; +} + +static int mmc_blk_busy_cb(void *cb_data, bool *busy) +{ + struct mmc_blk_busy_data *data = cb_data; + u32 status = 0; + int err; + + err = mmc_send_status(data->card, &status); + if (err) + return err; + + /* Accumulate response error bits. */ + data->status |= status; + + *busy = !mmc_ready_for_data(status); + return 0; +} + +static int mmc_blk_card_busy(struct mmc_card *card, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_blk_busy_data cb_data; + int err; + + if (rq_data_dir(req) == READ) + return 0; + + if (mmc_host_is_spi(card->host)) { + err = mmc_spi_err_check(card); + if (err) + mqrq->brq.data.bytes_xfered = 0; + return err; + } + + cb_data.card = card; + cb_data.status = 0; + err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS, + &mmc_blk_busy_cb, &cb_data); + + /* + * Do not assume data transferred correctly if there are any error bits + * set. + */ + if (cb_data.status & mmc_blk_stop_err_bits(&mqrq->brq)) { + mqrq->brq.data.bytes_xfered = 0; + err = err ? err : -EIO; + } + + /* Copy the exception bit so it will be seen later on */ + if (mmc_card_mmc(card) && cb_data.status & R1_EXCEPTION_EVENT) + mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT; + + return err; +} + +static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq, + struct request *req) +{ + int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE; + + mmc_blk_reset_success(mq->blkdata, type); +} + +static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + unsigned int nr_bytes = mqrq->brq.data.bytes_xfered; + + if (nr_bytes) { + if (blk_update_request(req, BLK_STS_OK, nr_bytes)) + blk_mq_requeue_request(req, true); + else + __blk_mq_end_request(req, BLK_STS_OK); + } else if (!blk_rq_bytes(req)) { + __blk_mq_end_request(req, BLK_STS_IOERR); + } else if (mqrq->retries++ < MMC_MAX_RETRIES) { + blk_mq_requeue_request(req, true); + } else { + if (mmc_card_removed(mq->card)) + req->rq_flags |= RQF_QUIET; + blk_mq_end_request(req, BLK_STS_IOERR); + } +} + +static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq, + struct mmc_queue_req *mqrq) +{ + return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) && + (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT || + mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT); +} + +static void mmc_blk_urgent_bkops(struct mmc_queue *mq, + struct mmc_queue_req *mqrq) +{ + if (mmc_blk_urgent_bkops_needed(mq, mqrq)) + mmc_run_bkops(mq->card); +} + +static void mmc_blk_hsq_req_done(struct mmc_request *mrq) +{ + struct mmc_queue_req *mqrq = + container_of(mrq, struct mmc_queue_req, brq.mrq); + struct request *req = mmc_queue_req_to_req(mqrq); + struct request_queue *q = req->q; + struct mmc_queue *mq = q->queuedata; + struct mmc_host *host = mq->card->host; + unsigned long flags; + + if (mmc_blk_rq_error(&mqrq->brq) || + mmc_blk_urgent_bkops_needed(mq, mqrq)) { + spin_lock_irqsave(&mq->lock, flags); + mq->recovery_needed = true; + mq->recovery_req = req; + spin_unlock_irqrestore(&mq->lock, flags); + + host->cqe_ops->cqe_recovery_start(host); + + schedule_work(&mq->recovery_work); + return; + } + + mmc_blk_rw_reset_success(mq, req); + + /* + * Block layer timeouts race with completions which means the normal + * completion path cannot be used during recovery. + */ + if (mq->in_recovery) + mmc_blk_cqe_complete_rq(mq, req); + else if (likely(!blk_should_fake_timeout(req->q))) + blk_mq_complete_request(req); +} + +void mmc_blk_mq_complete(struct request *req) +{ + struct mmc_queue *mq = req->q->queuedata; + struct mmc_host *host = mq->card->host; + + if (host->cqe_enabled) + mmc_blk_cqe_complete_rq(mq, req); + else if (likely(!blk_should_fake_timeout(req->q))) + mmc_blk_mq_complete_rq(mq, req); +} + +static void mmc_blk_mq_poll_completion(struct mmc_queue *mq, + struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_host *host = mq->card->host; + + if (mmc_blk_rq_error(&mqrq->brq) || + mmc_blk_card_busy(mq->card, req)) { + mmc_blk_mq_rw_recovery(mq, req); + } else { + mmc_blk_rw_reset_success(mq, req); + mmc_retune_release(host); + } + + mmc_blk_urgent_bkops(mq, mqrq); +} + +static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, enum mmc_issue_type issue_type) +{ + unsigned long flags; + bool put_card; + + spin_lock_irqsave(&mq->lock, flags); + + mq->in_flight[issue_type] -= 1; + + put_card = (mmc_tot_in_flight(mq) == 0); + + spin_unlock_irqrestore(&mq->lock, flags); + + if (put_card) + mmc_put_card(mq->card, &mq->ctx); +} + +static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req, + bool can_sleep) +{ + enum mmc_issue_type issue_type = mmc_issue_type(mq, req); + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_request *mrq = &mqrq->brq.mrq; + struct mmc_host *host = mq->card->host; + + mmc_post_req(host, mrq, 0); + + /* + * Block layer timeouts race with completions which means the normal + * completion path cannot be used during recovery. + */ + if (mq->in_recovery) { + mmc_blk_mq_complete_rq(mq, req); + } else if (likely(!blk_should_fake_timeout(req->q))) { + if (can_sleep) + blk_mq_complete_request_direct(req, mmc_blk_mq_complete); + else + blk_mq_complete_request(req); + } + + mmc_blk_mq_dec_in_flight(mq, issue_type); +} + +void mmc_blk_mq_recovery(struct mmc_queue *mq) +{ + struct request *req = mq->recovery_req; + struct mmc_host *host = mq->card->host; + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + + mq->recovery_req = NULL; + mq->rw_wait = false; + + if (mmc_blk_rq_error(&mqrq->brq)) { + mmc_retune_hold_now(host); + mmc_blk_mq_rw_recovery(mq, req); + } + + mmc_blk_urgent_bkops(mq, mqrq); + + mmc_blk_mq_post_req(mq, req, true); +} + +static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq, + struct request **prev_req) +{ + if (mmc_host_done_complete(mq->card->host)) + return; + + mutex_lock(&mq->complete_lock); + + if (!mq->complete_req) + goto out_unlock; + + mmc_blk_mq_poll_completion(mq, mq->complete_req); + + if (prev_req) + *prev_req = mq->complete_req; + else + mmc_blk_mq_post_req(mq, mq->complete_req, true); + + mq->complete_req = NULL; + +out_unlock: + mutex_unlock(&mq->complete_lock); +} + +void mmc_blk_mq_complete_work(struct work_struct *work) +{ + struct mmc_queue *mq = container_of(work, struct mmc_queue, + complete_work); + + mmc_blk_mq_complete_prev_req(mq, NULL); +} + +static void mmc_blk_mq_req_done(struct mmc_request *mrq) +{ + struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req, + brq.mrq); + struct request *req = mmc_queue_req_to_req(mqrq); + struct request_queue *q = req->q; + struct mmc_queue *mq = q->queuedata; + struct mmc_host *host = mq->card->host; + unsigned long flags; + + if (!mmc_host_done_complete(host)) { + bool waiting; + + /* + * We cannot complete the request in this context, so record + * that there is a request to complete, and that a following + * request does not need to wait (although it does need to + * complete complete_req first). + */ + spin_lock_irqsave(&mq->lock, flags); + mq->complete_req = req; + mq->rw_wait = false; + waiting = mq->waiting; + spin_unlock_irqrestore(&mq->lock, flags); + + /* + * If 'waiting' then the waiting task will complete this + * request, otherwise queue a work to do it. Note that + * complete_work may still race with the dispatch of a following + * request. + */ + if (waiting) + wake_up(&mq->wait); + else + queue_work(mq->card->complete_wq, &mq->complete_work); + + return; + } + + /* Take the recovery path for errors or urgent background operations */ + if (mmc_blk_rq_error(&mqrq->brq) || + mmc_blk_urgent_bkops_needed(mq, mqrq)) { + spin_lock_irqsave(&mq->lock, flags); + mq->recovery_needed = true; + mq->recovery_req = req; + spin_unlock_irqrestore(&mq->lock, flags); + wake_up(&mq->wait); + schedule_work(&mq->recovery_work); + return; + } + + mmc_blk_rw_reset_success(mq, req); + + mq->rw_wait = false; + wake_up(&mq->wait); + + /* context unknown */ + mmc_blk_mq_post_req(mq, req, false); +} + +static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err) +{ + unsigned long flags; + bool done; + + /* + * Wait while there is another request in progress, but not if recovery + * is needed. Also indicate whether there is a request waiting to start. + */ + spin_lock_irqsave(&mq->lock, flags); + if (mq->recovery_needed) { + *err = -EBUSY; + done = true; + } else { + done = !mq->rw_wait; + } + mq->waiting = !done; + spin_unlock_irqrestore(&mq->lock, flags); + + return done; +} + +static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req) +{ + int err = 0; + + wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err)); + + /* Always complete the previous request if there is one */ + mmc_blk_mq_complete_prev_req(mq, prev_req); + + return err; +} + +static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq, + struct request *req) +{ + struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); + struct mmc_host *host = mq->card->host; + struct request *prev_req = NULL; + int err = 0; + + mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq); + + mqrq->brq.mrq.done = mmc_blk_mq_req_done; + + mmc_pre_req(host, &mqrq->brq.mrq); + + err = mmc_blk_rw_wait(mq, &prev_req); + if (err) + goto out_post_req; + + mq->rw_wait = true; + + err = mmc_start_request(host, &mqrq->brq.mrq); + + if (prev_req) + mmc_blk_mq_post_req(mq, prev_req, true); + + if (err) + mq->rw_wait = false; + + /* Release re-tuning here where there is no synchronization required */ + if (err || mmc_host_done_complete(host)) + mmc_retune_release(host); + +out_post_req: + if (err) + mmc_post_req(host, &mqrq->brq.mrq, err); + + return err; +} + +static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host) +{ + if (host->cqe_enabled) + return host->cqe_ops->cqe_wait_for_idle(host); + + return mmc_blk_rw_wait(mq, NULL); +} + +enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req) +{ + struct mmc_blk_data *md = mq->blkdata; + struct mmc_card *card = md->queue.card; + struct mmc_host *host = card->host; + int ret; + + ret = mmc_blk_part_switch(card, md->part_type); + if (ret) + return MMC_REQ_FAILED_TO_START; + + switch (mmc_issue_type(mq, req)) { + case MMC_ISSUE_SYNC: + ret = mmc_blk_wait_for_idle(mq, host); + if (ret) + return MMC_REQ_BUSY; + switch (req_op(req)) { + case REQ_OP_DRV_IN: + case REQ_OP_DRV_OUT: + mmc_blk_issue_drv_op(mq, req); + break; + case REQ_OP_DISCARD: + mmc_blk_issue_discard_rq(mq, req); + break; + case REQ_OP_SECURE_ERASE: + mmc_blk_issue_secdiscard_rq(mq, req); + break; + case REQ_OP_WRITE_ZEROES: + mmc_blk_issue_trim_rq(mq, req); + break; + case REQ_OP_FLUSH: + mmc_blk_issue_flush(mq, req); + break; + default: + WARN_ON_ONCE(1); + return MMC_REQ_FAILED_TO_START; + } + return MMC_REQ_FINISHED; + case MMC_ISSUE_DCMD: + case MMC_ISSUE_ASYNC: + switch (req_op(req)) { + case REQ_OP_FLUSH: + if (!mmc_cache_enabled(host)) { + blk_mq_end_request(req, BLK_STS_OK); + return MMC_REQ_FINISHED; + } + ret = mmc_blk_cqe_issue_flush(mq, req); + break; + case REQ_OP_WRITE: + card->written_flag = true; + fallthrough; + case REQ_OP_READ: + if (host->cqe_enabled) + ret = mmc_blk_cqe_issue_rw_rq(mq, req); + else + ret = mmc_blk_mq_issue_rw_rq(mq, req); + break; + default: + WARN_ON_ONCE(1); + ret = -EINVAL; + } + if (!ret) + return MMC_REQ_STARTED; + return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START; + default: + WARN_ON_ONCE(1); + return MMC_REQ_FAILED_TO_START; + } +} + +static inline int mmc_blk_readonly(struct mmc_card *card) +{ + return mmc_card_readonly(card) || + !(card->csd.cmdclass & CCC_BLOCK_WRITE); +} + +static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, + struct device *parent, + sector_t size, + bool default_ro, + const char *subname, + int area_type, + unsigned int part_type) +{ + struct mmc_blk_data *md; + int devidx, ret; + char cap_str[10]; + bool cache_enabled = false; + bool fua_enabled = false; + + devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL); + if (devidx < 0) { + /* + * We get -ENOSPC because there are no more any available + * devidx. The reason may be that, either userspace haven't yet + * unmounted the partitions, which postpones mmc_blk_release() + * from being called, or the device has more partitions than + * what we support. + */ + if (devidx == -ENOSPC) + dev_err(mmc_dev(card->host), + "no more device IDs available\n"); + + return ERR_PTR(devidx); + } + + md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); + if (!md) { + ret = -ENOMEM; + goto out; + } + + md->area_type = area_type; + + /* + * Set the read-only status based on the supported commands + * and the write protect switch. + */ + md->read_only = mmc_blk_readonly(card); + + md->disk = mmc_init_queue(&md->queue, card); + if (IS_ERR(md->disk)) { + ret = PTR_ERR(md->disk); + goto err_kfree; + } + + INIT_LIST_HEAD(&md->part); + INIT_LIST_HEAD(&md->rpmbs); + kref_init(&md->kref); + + md->queue.blkdata = md; + md->part_type = part_type; + + md->disk->major = MMC_BLOCK_MAJOR; + md->disk->minors = perdev_minors; + md->disk->first_minor = devidx * perdev_minors; + md->disk->fops = &mmc_bdops; + md->disk->private_data = md; + md->parent = parent; + set_disk_ro(md->disk, md->read_only || default_ro); + if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT)) + md->disk->flags |= GENHD_FL_NO_PART; + + /* + * As discussed on lkml, GENHD_FL_REMOVABLE should: + * + * - be set for removable media with permanent block devices + * - be unset for removable block devices with permanent media + * + * Since MMC block devices clearly fall under the second + * case, we do not set GENHD_FL_REMOVABLE. Userspace + * should use the block device creation/destruction hotplug + * messages to tell when the card is present. + */ + + snprintf(md->disk->disk_name, sizeof(md->disk->disk_name), + "mmcblk%u%s", card->host->index, subname ? subname : ""); + + set_capacity(md->disk, size); + + if (mmc_host_cmd23(card->host)) { + if ((mmc_card_mmc(card) && + card->csd.mmca_vsn >= CSD_SPEC_VER_3) || + (mmc_card_sd(card) && + card->scr.cmds & SD_SCR_CMD23_SUPPORT)) + md->flags |= MMC_BLK_CMD23; + } + + if (md->flags & MMC_BLK_CMD23 && + ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) || + card->ext_csd.rel_sectors)) { + md->flags |= MMC_BLK_REL_WR; + fua_enabled = true; + cache_enabled = true; + } + if (mmc_cache_enabled(card->host)) + cache_enabled = true; + + blk_queue_write_cache(md->queue.queue, cache_enabled, fua_enabled); + + string_get_size((u64)size, 512, STRING_UNITS_2, + cap_str, sizeof(cap_str)); + pr_info("%s: %s %s %s %s\n", + md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), + cap_str, md->read_only ? "(ro)" : ""); + + /* used in ->open, must be set before add_disk: */ + if (area_type == MMC_BLK_DATA_AREA_MAIN) + dev_set_drvdata(&card->dev, md); + ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups); + if (ret) + goto err_put_disk; + return md; + + err_put_disk: + put_disk(md->disk); + blk_mq_free_tag_set(&md->queue.tag_set); + err_kfree: + kfree(md); + out: + ida_simple_remove(&mmc_blk_ida, devidx); + return ERR_PTR(ret); +} + +static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) +{ + sector_t size; + + if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { + /* + * The EXT_CSD sector count is in number or 512 byte + * sectors. + */ + size = card->ext_csd.sectors; + } else { + /* + * The CSD capacity field is in units of read_blkbits. + * set_capacity takes units of 512 bytes. + */ + size = (typeof(sector_t))card->csd.capacity + << (card->csd.read_blkbits - 9); + } + + return mmc_blk_alloc_req(card, &card->dev, size, false, NULL, + MMC_BLK_DATA_AREA_MAIN, 0); +} + +static int mmc_blk_alloc_part(struct mmc_card *card, + struct mmc_blk_data *md, + unsigned int part_type, + sector_t size, + bool default_ro, + const char *subname, + int area_type) +{ + struct mmc_blk_data *part_md; + + part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro, + subname, area_type, part_type); + if (IS_ERR(part_md)) + return PTR_ERR(part_md); + list_add(&part_md->part, &md->part); + + return 0; +} + +/** + * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev + * @filp: the character device file + * @cmd: the ioctl() command + * @arg: the argument from userspace + * + * This will essentially just redirect the ioctl()s coming in over to + * the main block device spawning the RPMB character device. + */ +static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + struct mmc_rpmb_data *rpmb = filp->private_data; + int ret; + + switch (cmd) { + case MMC_IOC_CMD: + ret = mmc_blk_ioctl_cmd(rpmb->md, + (struct mmc_ioc_cmd __user *)arg, + rpmb); + break; + case MMC_IOC_MULTI_CMD: + ret = mmc_blk_ioctl_multi_cmd(rpmb->md, + (struct mmc_ioc_multi_cmd __user *)arg, + rpmb); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +#ifdef CONFIG_COMPAT +static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd, + unsigned long arg) +{ + return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); +} +#endif + +static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp) +{ + struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev, + struct mmc_rpmb_data, chrdev); + + get_device(&rpmb->dev); + filp->private_data = rpmb; + mmc_blk_get(rpmb->md->disk); + + return nonseekable_open(inode, filp); +} + +static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp) +{ + struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev, + struct mmc_rpmb_data, chrdev); + + mmc_blk_put(rpmb->md); + put_device(&rpmb->dev); + + return 0; +} + +static const struct file_operations mmc_rpmb_fileops = { + .release = mmc_rpmb_chrdev_release, + .open = mmc_rpmb_chrdev_open, + .owner = THIS_MODULE, + .llseek = no_llseek, + .unlocked_ioctl = mmc_rpmb_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = mmc_rpmb_ioctl_compat, +#endif +}; + +static void mmc_blk_rpmb_device_release(struct device *dev) +{ + struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev); + + ida_simple_remove(&mmc_rpmb_ida, rpmb->id); + kfree(rpmb); +} + +static int mmc_blk_alloc_rpmb_part(struct mmc_card *card, + struct mmc_blk_data *md, + unsigned int part_index, + sector_t size, + const char *subname) +{ + int devidx, ret; + char rpmb_name[DISK_NAME_LEN]; + char cap_str[10]; + struct mmc_rpmb_data *rpmb; + + /* This creates the minor number for the RPMB char device */ + devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL); + if (devidx < 0) + return devidx; + + rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL); + if (!rpmb) { + ida_simple_remove(&mmc_rpmb_ida, devidx); + return -ENOMEM; + } + + snprintf(rpmb_name, sizeof(rpmb_name), + "mmcblk%u%s", card->host->index, subname ? subname : ""); + + rpmb->id = devidx; + rpmb->part_index = part_index; + rpmb->dev.init_name = rpmb_name; + rpmb->dev.bus = &mmc_rpmb_bus_type; + rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id); + rpmb->dev.parent = &card->dev; + rpmb->dev.release = mmc_blk_rpmb_device_release; + device_initialize(&rpmb->dev); + dev_set_drvdata(&rpmb->dev, rpmb); + rpmb->md = md; + + cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops); + rpmb->chrdev.owner = THIS_MODULE; + ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev); + if (ret) { + pr_err("%s: could not add character device\n", rpmb_name); + goto out_put_device; + } + + list_add(&rpmb->node, &md->rpmbs); + + string_get_size((u64)size, 512, STRING_UNITS_2, + cap_str, sizeof(cap_str)); + + pr_info("%s: %s %s %s, chardev (%d:%d)\n", + rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str, + MAJOR(mmc_rpmb_devt), rpmb->id); + + return 0; + +out_put_device: + put_device(&rpmb->dev); + return ret; +} + +static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb) + +{ + cdev_device_del(&rpmb->chrdev, &rpmb->dev); + put_device(&rpmb->dev); +} + +/* MMC Physical partitions consist of two boot partitions and + * up to four general purpose partitions. + * For each partition enabled in EXT_CSD a block device will be allocatedi + * to provide access to the partition. + */ + +static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md) +{ + int idx, ret; + + if (!mmc_card_mmc(card)) + return 0; + + for (idx = 0; idx < card->nr_parts; idx++) { + if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) { + /* + * RPMB partitions does not provide block access, they + * are only accessed using ioctl():s. Thus create + * special RPMB block devices that do not have a + * backing block queue for these. + */ + ret = mmc_blk_alloc_rpmb_part(card, md, + card->part[idx].part_cfg, + card->part[idx].size >> 9, + card->part[idx].name); + if (ret) + return ret; + } else if (card->part[idx].size) { + ret = mmc_blk_alloc_part(card, md, + card->part[idx].part_cfg, + card->part[idx].size >> 9, + card->part[idx].force_ro, + card->part[idx].name, + card->part[idx].area_type); + if (ret) + return ret; + } + } + + return 0; +} + +static void mmc_blk_remove_req(struct mmc_blk_data *md) +{ + /* + * Flush remaining requests and free queues. It is freeing the queue + * that stops new requests from being accepted. + */ + del_gendisk(md->disk); + mmc_cleanup_queue(&md->queue); + mmc_blk_put(md); +} + +static void mmc_blk_remove_parts(struct mmc_card *card, + struct mmc_blk_data *md) +{ + struct list_head *pos, *q; + struct mmc_blk_data *part_md; + struct mmc_rpmb_data *rpmb; + + /* Remove RPMB partitions */ + list_for_each_safe(pos, q, &md->rpmbs) { + rpmb = list_entry(pos, struct mmc_rpmb_data, node); + list_del(pos); + mmc_blk_remove_rpmb_part(rpmb); + } + /* Remove block partitions */ + list_for_each_safe(pos, q, &md->part) { + part_md = list_entry(pos, struct mmc_blk_data, part); + list_del(pos); + mmc_blk_remove_req(part_md); + } +} + +#ifdef CONFIG_DEBUG_FS + +static int mmc_dbg_card_status_get(void *data, u64 *val) +{ + struct mmc_card *card = data; + struct mmc_blk_data *md = dev_get_drvdata(&card->dev); + struct mmc_queue *mq = &md->queue; + struct request *req; + int ret; + + /* Ask the block layer about the card status */ + req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0); + if (IS_ERR(req)) + return PTR_ERR(req); + req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS; + req_to_mmc_queue_req(req)->drv_op_result = -EIO; + blk_execute_rq(req, false); + ret = req_to_mmc_queue_req(req)->drv_op_result; + if (ret >= 0) { + *val = ret; + ret = 0; + } + blk_mq_free_request(req); + + return ret; +} +DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, + NULL, "%08llx\n"); + +/* That is two digits * 512 + 1 for newline */ +#define EXT_CSD_STR_LEN 1025 + +static int mmc_ext_csd_open(struct inode *inode, struct file *filp) +{ + struct mmc_card *card = inode->i_private; + struct mmc_blk_data *md = dev_get_drvdata(&card->dev); + struct mmc_queue *mq = &md->queue; + struct request *req; + char *buf; + ssize_t n = 0; + u8 *ext_csd; + int err, i; + + buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + /* Ask the block layer for the EXT CSD */ + req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out_free; + } + req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD; + req_to_mmc_queue_req(req)->drv_op_result = -EIO; + req_to_mmc_queue_req(req)->drv_op_data = &ext_csd; + blk_execute_rq(req, false); + err = req_to_mmc_queue_req(req)->drv_op_result; + blk_mq_free_request(req); + if (err) { + pr_err("FAILED %d\n", err); + goto out_free; + } + + for (i = 0; i < 512; i++) + n += sprintf(buf + n, "%02x", ext_csd[i]); + n += sprintf(buf + n, "\n"); + + if (n != EXT_CSD_STR_LEN) { + err = -EINVAL; + kfree(ext_csd); + goto out_free; + } + + filp->private_data = buf; + kfree(ext_csd); + return 0; + +out_free: + kfree(buf); + return err; +} + +static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char *buf = filp->private_data; + + return simple_read_from_buffer(ubuf, cnt, ppos, + buf, EXT_CSD_STR_LEN); +} + +static int mmc_ext_csd_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +static const struct file_operations mmc_dbg_ext_csd_fops = { + .open = mmc_ext_csd_open, + .read = mmc_ext_csd_read, + .release = mmc_ext_csd_release, + .llseek = default_llseek, +}; + +static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md) +{ + struct dentry *root; + + if (!card->debugfs_root) + return 0; + + root = card->debugfs_root; + + if (mmc_card_mmc(card) || mmc_card_sd(card)) { + md->status_dentry = + debugfs_create_file_unsafe("status", 0400, root, + card, + &mmc_dbg_card_status_fops); + if (!md->status_dentry) + return -EIO; + } + + if (mmc_card_mmc(card)) { + md->ext_csd_dentry = + debugfs_create_file("ext_csd", S_IRUSR, root, card, + &mmc_dbg_ext_csd_fops); + if (!md->ext_csd_dentry) + return -EIO; + } + + return 0; +} + +static void mmc_blk_remove_debugfs(struct mmc_card *card, + struct mmc_blk_data *md) +{ + if (!card->debugfs_root) + return; + + if (!IS_ERR_OR_NULL(md->status_dentry)) { + debugfs_remove(md->status_dentry); + md->status_dentry = NULL; + } + + if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) { + debugfs_remove(md->ext_csd_dentry); + md->ext_csd_dentry = NULL; + } +} + +#else + +static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md) +{ + return 0; +} + +static void mmc_blk_remove_debugfs(struct mmc_card *card, + struct mmc_blk_data *md) +{ +} + +#endif /* CONFIG_DEBUG_FS */ + +static int mmc_blk_probe(struct mmc_card *card) +{ + struct mmc_blk_data *md; + int ret = 0; + + /* + * Check that the card supports the command class(es) we need. + */ + if (!(card->csd.cmdclass & CCC_BLOCK_READ)) + return -ENODEV; + + mmc_fixup_device(card, mmc_blk_fixups); + + card->complete_wq = alloc_workqueue("mmc_complete", + WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); + if (!card->complete_wq) { + pr_err("Failed to create mmc completion workqueue"); + return -ENOMEM; + } + + md = mmc_blk_alloc(card); + if (IS_ERR(md)) { + ret = PTR_ERR(md); + goto out_free; + } + + ret = mmc_blk_alloc_parts(card, md); + if (ret) + goto out; + + /* Add two debugfs entries */ + mmc_blk_add_debugfs(card, md); + + pm_runtime_set_autosuspend_delay(&card->dev, 3000); + pm_runtime_use_autosuspend(&card->dev); + + /* + * Don't enable runtime PM for SD-combo cards here. Leave that + * decision to be taken during the SDIO init sequence instead. + */ + if (!mmc_card_sd_combo(card)) { + pm_runtime_set_active(&card->dev); + pm_runtime_enable(&card->dev); + } + + return 0; + +out: + mmc_blk_remove_parts(card, md); + mmc_blk_remove_req(md); +out_free: + destroy_workqueue(card->complete_wq); + return ret; +} + +static void mmc_blk_remove(struct mmc_card *card) +{ + struct mmc_blk_data *md = dev_get_drvdata(&card->dev); + + mmc_blk_remove_debugfs(card, md); + mmc_blk_remove_parts(card, md); + pm_runtime_get_sync(&card->dev); + if (md->part_curr != md->part_type) { + mmc_claim_host(card->host); + mmc_blk_part_switch(card, md->part_type); + mmc_release_host(card->host); + } + if (!mmc_card_sd_combo(card)) + pm_runtime_disable(&card->dev); + pm_runtime_put_noidle(&card->dev); + mmc_blk_remove_req(md); + dev_set_drvdata(&card->dev, NULL); + destroy_workqueue(card->complete_wq); +} + +static int _mmc_blk_suspend(struct mmc_card *card) +{ + struct mmc_blk_data *part_md; + struct mmc_blk_data *md = dev_get_drvdata(&card->dev); + + if (md) { + mmc_queue_suspend(&md->queue); + list_for_each_entry(part_md, &md->part, part) { + mmc_queue_suspend(&part_md->queue); + } + } + return 0; +} + +static void mmc_blk_shutdown(struct mmc_card *card) +{ + _mmc_blk_suspend(card); +} + +#ifdef CONFIG_PM_SLEEP +static int mmc_blk_suspend(struct device *dev) +{ + struct mmc_card *card = mmc_dev_to_card(dev); + + return _mmc_blk_suspend(card); +} + +static int mmc_blk_resume(struct device *dev) +{ + struct mmc_blk_data *part_md; + struct mmc_blk_data *md = dev_get_drvdata(dev); + + if (md) { + /* + * Resume involves the card going into idle state, + * so current partition is always the main one. + */ + md->part_curr = md->part_type; + mmc_queue_resume(&md->queue); + list_for_each_entry(part_md, &md->part, part) { + mmc_queue_resume(&part_md->queue); + } + } + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume); + +static struct mmc_driver mmc_driver = { + .drv = { + .name = "mmcblk", + .pm = &mmc_blk_pm_ops, + }, + .probe = mmc_blk_probe, + .remove = mmc_blk_remove, + .shutdown = mmc_blk_shutdown, +}; + +static int __init mmc_blk_init(void) +{ + int res; + + res = bus_register(&mmc_rpmb_bus_type); + if (res < 0) { + pr_err("mmcblk: could not register RPMB bus type\n"); + return res; + } + res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb"); + if (res < 0) { + pr_err("mmcblk: failed to allocate rpmb chrdev region\n"); + goto out_bus_unreg; + } + + if (perdev_minors != CONFIG_MMC_BLOCK_MINORS) + pr_info("mmcblk: using %d minors per device\n", perdev_minors); + + max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors); + + res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); + if (res) + goto out_chrdev_unreg; + + res = mmc_register_driver(&mmc_driver); + if (res) + goto out_blkdev_unreg; + + return 0; + +out_blkdev_unreg: + unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); +out_chrdev_unreg: + unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES); +out_bus_unreg: + bus_unregister(&mmc_rpmb_bus_type); + return res; +} + +static void __exit mmc_blk_exit(void) +{ + mmc_unregister_driver(&mmc_driver); + unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); + unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES); + bus_unregister(&mmc_rpmb_bus_type); +} + +module_init(mmc_blk_init); +module_exit(mmc_blk_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); |