xref: /device/soc/rockchip/common/sdk_linux/drivers/mmc/core/block.c

/*
 * 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/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 "core.h"
#include "card.h"
#include "host.h"
#include "bus.h"
#include "mmc_ops.h"
#include "quirks.h"
#include "sd_ops.h"
#include "block.h"

MODULE_ALIAS("mmc:block");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "mmcblk."
#define MMC_LOCK_STATE_RESULT_ONE 1
#define MMC_LOCK_STATE_RESULT_TWO 2
#define MMC_MMC_BLK_HEADERS 4
#define MMC_MMC_BLK_SECTORS 16
#define MMC_CARD_BUSY_DETECT_RETRY_COUNT 5
#define MMC_MS_TO_NS_MUL 1000000
#define MMC_WRITE_FLAG_BIT 31
#define MMC_CARD_RCA_SHIFT 16
#define MMC_WRITE_BLK_SIZE 4
#define MMC_CLK_DIV 1000
#define MMC_CLK_DIV_FACTOR 2
#define MMC_MIN_CLK 100
#define MMC_REQUEST_BLK_SIZE 512
#define MMC_REQUEST_SHIFT_VALUE 9
#define MMC_ONE_BYTE_SHIFT_VALUE 8
#define MMC_TWO_BYTES_SHIFT_VALUE 16
#define MMC_THREE_BYTES_SHIFT_VALUE 24
#define MMC_BLK_REQUEST_ARG_SHIFT_VALUE 9
#define MMC_BLK_REL_WR_SHIFT_VALUE 31
#define MMC_BLK_DATA_TAG_SHIFT_VALUE 29
#define MMC_SINGLE_SECTOR_SIZE 512
#define MMC_S_IRUSR 0400
#define MMC_AUTO_SUSPEND_DELAY_COUNT 3000

/*
 * 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);

/*
 * 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 */

    unsigned int usage;
    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)

    /*
     * 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;
    struct device_attribute force_ro;
    struct device_attribute power_ro_lock;
    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 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 && md->usage == 0) {
        md = NULL;
    }
    if (md) {
        md->usage++;
    }
    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_put(struct mmc_blk_data *md)
{
    mutex_lock(&open_lock);
    md->usage--;
    if (md->usage == 0) {
        int devidx = mmc_get_devidx(md->disk);
        blk_put_queue(md->queue.queue);
        ida_simple_remove(&mmc_blk_ida, devidx);
        put_disk(md->disk);
        kfree(md);
    }
    mutex_unlock(&open_lock);
}

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 = MMC_LOCK_STATE_RESULT_TWO;
    } else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN) {
        locked = MMC_LOCK_STATE_RESULT_ONE;
    }

    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_get_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;
    blk_execute_rq(mq->queue, NULL, req, 0);
    ret = req_to_mmc_queue_req(req)->drv_op_result;
    blk_put_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 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 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) / (MMC_MMC_BLK_HEADERS * MMC_MMC_BLK_SECTORS);
    geo->heads = MMC_MMC_BLK_HEADERS;
    geo->sectors = MMC_MMC_BLK_SECTORS;
    return 0;
}

struct mmc_blk_ioc_data {
    struct mmc_ioc_cmd ic;
    unsigned char *buf;
    u64 buf_bytes;
    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 card_busy_detect(struct mmc_card *card, unsigned int timeout_ms, u32 *resp_errs)
{
    unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
    int err = 0;
    u32 status;

    do {
        bool done = time_after(jiffies, timeout);

        err = __mmc_send_status(card, &status, MMC_CARD_BUSY_DETECT_RETRY_COUNT);
        if (err) {
            dev_err(mmc_dev(card->host), "error %d requesting status\n", err);
            return err;
        }

        /* Accumulate any response error bits seen */
        if (resp_errs) {
            *resp_errs |= status;
        }

        /*
         * Timeout if the device never becomes ready for data and never
         * leaves the program state.
         */
        if (done) {
            dev_err(mmc_dev(card->host), "Card stuck in wrong state! %s status: %#x\n", __func__, status);
            return -ETIMEDOUT;
        }
    } while (!mmc_ready_for_data(status));

    return err;
}

static int mmc_blk_ioctl_cmd_ext(struct mmc_card *card, struct mmc_blk_data *md, struct mmc_blk_ioc_data *idata)
{
    struct mmc_command cmd = {}, sbc = {};
    struct mmc_data data = {};
    struct mmc_request mrq = {};
    struct scatterlist sg;
    int err;
    unsigned int target_part;

    if (!card || !md || !idata) {
        return -EINVAL;
    }

    /*
     * 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 * MMC_MS_TO_NS_MUL;
        }

        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) {
        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(MMC_WRITE_FLAG_BIT));
        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);
    }

    mmc_wait_for_req(card->host, &mrq);
    memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));

    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 (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
        /*
         * Ensure RPMB/R1B command has completed by polling CMD13
         * "Send Status".
         */
        err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL);
    }

    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_get_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_data = idatas;
    req_to_mmc_queue_req(req)->ioc_count = 1;
    blk_execute_rq(mq->queue, NULL, req, 0);
    ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
    err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
    blk_put_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 i, err = 0, ioc_err = 0;
    __u64 num_of_cmds;
    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;
    }

    idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
    if (!idata) {
        return -ENOMEM;
    }

    for (i = 0; i < num_of_cmds; i++) {
        idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
        if (IS_ERR(idata[i])) {
            err = PTR_ERR(idata[i]);
            num_of_cmds = 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_get_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_data = idata;
    req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
    blk_execute_rq(mq->queue, NULL, req, 0);
    ioc_err = req_to_mmc_queue_req(req)->drv_op_result;

    /* copy to user if data and response */
    for (i = 0; i < num_of_cmds && !err; i++) {
        err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
    }

    blk_put_request(req);

cmd_err:
    for (i = 0; i < num_of_cmds; 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 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
};

static int mmc_blk_part_switch_pre(struct mmc_card *card, unsigned int part_type)
{
    int ret = 0;

    if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
        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)
{
    int ret = 0;

    if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
        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 << MMC_CARD_RCA_SHIFT;
    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 = MMC_WRITE_BLK_SIZE;
    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(MMC_WRITE_BLK_SIZE, GFP_KERNEL);
    if (!blocks) {
        return -ENOMEM;
    }

    sg_init_one(&sg, blocks, MMC_WRITE_BLK_SIZE);

    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 / MMC_CLK_DIV;
    }

    /* Clock may be subject to a divisor, fudge it by a factor of 2. */
    if (host->ios.clock) {
        return host->ios.clock / (MMC_CLK_DIV * MMC_CLK_DIV_FACTOR);
    }

    /* How can there be no clock */
    WARN_ON_ONCE(1);
    return MMC_MIN_CLK; /* 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, MMC_MS_TO_NS_MUL);
    unsigned int khz;

    if (data->timeout_clks) {
        khz = mmc_blk_clock_khz(host);
        ms += DIV_ROUND_UP(data->timeout_clks, khz);
    }

    return ms;
}

static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host, int type)
{
    int err;

    if (md->reset_done & type) {
        return -EEXIST;
    }

    md->reset_done |= type;
    err = mmc_hw_reset(host);
    /* Ensure we switch back to the correct partition */
    if (err != -EOPNOTSUPP) {
        struct mmc_blk_data *main_md = dev_get_drvdata(&host->card->dev);
        int part_err;

        main_md->part_curr = main_md->part_type;
        part_err = mmc_blk_part_switch(host->card, md->part_type);
        if (part_err) {
            /*
             * We have failed to get back into the correct
             * partition, so we need to abort the whole request.
             */
            return -ENODEV;
        }
    }
    return err;
}

static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
{
    md->reset_done &= ~type;
}

/*
 * 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;
                }
            }
            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_ext(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_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 from, nr;
    int err = 0, type = MMC_BLK_DISCARD;
    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,
                             card->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, card->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_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;
    }

    while (1) {
        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)) {
            continue;
        }
        if (!err) {
            mmc_blk_reset_success(md, type);
        }
    out:
        blk_mq_end_request(req, status);
        break;
    }
}

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);
    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));

    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 = MMC_REQUEST_BLK_SIZE;
    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 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) >> MMC_BLK_REQUEST_ARG_SHIFT_VALUE;
        }

        /*
         * 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 << MMC_REQUEST_SHIFT_VALUE;
        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 {
        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 << MMC_THREE_BYTES_SHIFT_VALUE) |
                    (EXT_CSD_FLUSH_CACHE << MMC_TWO_BYTES_SHIFT_VALUE) | (1 << MMC_ONE_BYTE_SHIFT_VALUE) |
                    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 <<= MMC_BLK_REQUEST_ARG_SHIFT_VALUE;
    }
    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 << MMC_BLK_REL_WR_SHIFT_VALUE) : 0) |
                       (do_data_tag ? (1 << MMC_BLK_DATA_TAG_SHIFT_VALUE) : 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, MMC_MAX_RETRIES);
}

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 = card_busy_detect(card, timeout, NULL);

    mmc_retune_release(card->host);

    return err;
}

#define MMC_READ_SINGLE_RETRIES 2

/* Single 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, MMC_SINGLE_SECTOR_SIZE));
    return;

error_exit:
    mrq->data->bytes_xfered = 0;
    blk_update_request(req, BLK_STS_IOERR, MMC_SINGLE_SECTOR_SIZE);
    /* 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 * MMC_SINGLE_SECTOR_SIZE;
        }
    }

    /* 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->rq_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);
    }

    /* 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;
    }

    /* Missing single sector read for large sector size */
        if (rq_data_dir(req) == READ && (brq->data.blocks >
            (queue_physical_block_size(mq->queue) >> MMC_BLK_REQUEST_ARG_SHIFT_VALUE))) {
        /* Read one 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_blk_card_busy(struct mmc_card *card, struct request *req)
{
    struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
    u32 status = 0;
    int err;

    if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ) {
        return 0;
    }

    err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status);

    /*
     * Do not assume data transferred correctly if there are any error bits
     * set.
     */
    if (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) && (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;

    if (mq->use_cqe) {
        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, struct request *req)
{
    unsigned long flags;
    bool put_card;

    spin_lock_irqsave(&mq->lock, flags);

    mq->in_flight[mmc_issue_type(mq, req)] -= 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)
{
    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))) {
        blk_mq_complete_request(req);
    }

    mmc_blk_mq_dec_in_flight(mq, req);
}

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);
}

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);
    }

    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);

    mmc_blk_mq_post_req(mq, req);
}

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);
    }

    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 (mq->use_cqe) {
        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_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_READ:
                case REQ_OP_WRITE:
                    if (mq->use_cqe) {
                        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)
{
    struct mmc_blk_data *md;
    int devidx, ret;

    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 = alloc_disk(perdev_minors);
    if (md->disk == NULL) {
        ret = -ENOMEM;
        goto err_kfree;
    }

    INIT_LIST_HEAD(&md->part);
    INIT_LIST_HEAD(&md->rpmbs);
    md->usage = 1;

    ret = mmc_init_queue(&md->queue, card);
    if (ret) {
        goto err_putdisk;
    }

    md->queue.blkdata = md;

    /*
     * Keep an extra reference to the queue so that we can shutdown the
     * queue (i.e. call blk_cleanup_queue()) while there are still
     * references to the 'md'. The corresponding blk_put_queue() is in
     * mmc_blk_put().
     */
    if (!blk_get_queue(md->queue.queue)) {
        mmc_cleanup_queue(&md->queue);
        ret = -ENODEV;
        goto err_putdisk;
    }

    md->disk->major = MMC_BLOCK_MAJOR;
    md->disk->first_minor = devidx * perdev_minors;
    md->disk->fops = &mmc_bdops;
    md->disk->private_data = md;
    md->disk->queue = md->queue.queue;
    md->parent = parent;
    set_disk_ro(md->disk, md->read_only || default_ro);
    md->disk->flags = GENHD_FL_EXT_DEVT;
    if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT)) {
        md->disk->flags |= GENHD_FL_NO_PART_SCAN | GENHD_FL_SUPPRESS_PARTITION_INFO;
    }

    /*
     * 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.
     */

    ret = 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 (mmc_card_mmc(card) && (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;
        blk_queue_write_cache(md->queue.queue, true, true);
    }

    return md;

err_putdisk:
    put_disk(md->disk);
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);
}

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)
{
    char cap_str[10];
    struct mmc_blk_data *part_md;

    part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro, subname, area_type);
    if (IS_ERR(part_md)) {
        return PTR_ERR(part_md);
    }
    part_md->part_type = part_type;
    list_add(&part_md->part, &md->part);

    string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2, cap_str, sizeof(cap_str));
    pr_info("%s: %s %s partition %u %s\n", part_md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
            part_md->part_type, cap_str);
    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;
    }

    ret = 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, MMC_SINGLE_SECTOR_SIZE, STRING_UNITS_2, cap_str, sizeof(cap_str));

    pr_info("%s: %s %s partition %u %s, chardev (%d:%d)\n", rpmb_name, mmc_card_id(card), mmc_card_name(card),
            EXT_CSD_PART_CONFIG_ACC_RPMB, 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 / MMC_SINGLE_SECTOR_SIZE, 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 / MMC_SINGLE_SECTOR_SIZE,
                                     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)
{
    struct mmc_card *card;

    if (md) {
        /*
         * Flush remaining requests and free queues. It
         * is freeing the queue that stops new requests
         * from being accepted.
         */
        card = md->queue.card;
        if (md->disk->flags & GENHD_FL_UP) {
            device_remove_file(disk_to_dev(md->disk), &md->force_ro);
            if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) && card->ext_csd.boot_ro_lockable) {
                device_remove_file(disk_to_dev(md->disk), &md->power_ro_lock);
            }

            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);
    }
}

static int mmc_add_disk(struct mmc_blk_data *md)
{
    int ret;
    struct mmc_card *card = md->queue.card;

    device_add_disk(md->parent, md->disk, NULL);
    md->force_ro.show = force_ro_show;
    md->force_ro.store = force_ro_store;
    sysfs_attr_init(&md->force_ro.attr);
    md->force_ro.attr.name = "force_ro";
    md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
    ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
    if (ret) {
        goto force_ro_fail;
    }

    if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) && card->ext_csd.boot_ro_lockable) {
        umode_t mode;

        if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS) {
            mode = S_IRUGO;
        } else {
            mode = S_IRUGO | S_IWUSR;
        }

        md->power_ro_lock.show = power_ro_lock_show;
        md->power_ro_lock.store = power_ro_lock_store;
        sysfs_attr_init(&md->power_ro_lock.attr);
        md->power_ro_lock.attr.mode = mode;
        md->power_ro_lock.attr.name = "ro_lock_until_next_power_on";
        ret = device_create_file(disk_to_dev(md->disk), &md->power_ro_lock);
        if (ret) {
            goto power_ro_lock_fail;
        }
    }
    return ret;

power_ro_lock_fail:
    device_remove_file(disk_to_dev(md->disk), &md->force_ro);
force_ro_fail:
    del_gendisk(md->disk);

    return ret;
}

#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_get_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;
    blk_execute_rq(mq->queue, NULL, req, 0);
    ret = req_to_mmc_queue_req(req)->drv_op_result;
    if (ret >= 0) {
        *val = ret;
        ret = 0;
    }
    blk_put_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_get_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_data = &ext_csd;
    blk_execute_rq(mq->queue, NULL, req, 0);
    err = req_to_mmc_queue_req(req)->drv_op_result;
    blk_put_request(req);
    if (err) {
        pr_err("FAILED %d\n", err);
        goto out_free;
    }

    for (i = 0; i < MMC_SINGLE_SECTOR_SIZE; 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", MMC_S_IRUSR, 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 */

struct mmc_card *this_card;
EXPORT_SYMBOL(this_card);

static int mmc_blk_probe(struct mmc_card *card)
{
    struct mmc_blk_data *md, *part_md;
    char cap_str[10];

    /*
     * 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 (unlikely(!card->complete_wq)) {
        pr_err("Failed to create mmc completion workqueue");
        return -ENOMEM;
    }

    md = mmc_blk_alloc(card);
    if (IS_ERR(md)) {
        return PTR_ERR(md);
    }

    string_get_size((u64)get_capacity(md->disk), MMC_SINGLE_SECTOR_SIZE, 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)" : "");

    if (mmc_blk_alloc_parts(card, md)) {
        goto out;
    }

    dev_set_drvdata(&card->dev, md);

    if (mmc_add_disk(md)) {
        goto out;
    }

    list_for_each_entry(part_md, &md->part, part)
    {
        if (mmc_add_disk(part_md)) {
            goto out;
        }
    }

    /* Add two debugfs entries */
    mmc_blk_add_debugfs(card, md);

    pm_runtime_set_autosuspend_delay(&card->dev, MMC_AUTO_SUSPEND_DELAY_COUNT);
    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 (card->type != MMC_TYPE_SD_COMBO) {
        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);
    return 0;
}

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 (card->type != MMC_TYPE_SD_COMBO) {
        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");