block.c 65.1 KB
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/*
 * Block driver for media (i.e., flash cards)
 *
 * Copyright 2002 Hewlett-Packard Company
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 * Copyright 2005-2008 Pierre Ossman
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 *
 * 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>
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#include <linux/slab.h>
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#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.h>
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#include <linux/string_helpers.h>
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#include <linux/delay.h>
#include <linux/capability.h>
#include <linux/compat.h>
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#include <linux/pm_runtime.h>
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#include <linux/mmc/ioctl.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
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#include <asm/uaccess.h>

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#include "queue.h"
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MODULE_ALIAS("mmc:block");
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#ifdef KERNEL
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#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "mmcblk."
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#endif
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#define INAND_CMD38_ARG_EXT_CSD  113
#define INAND_CMD38_ARG_ERASE    0x00
#define INAND_CMD38_ARG_TRIM     0x01
#define INAND_CMD38_ARG_SECERASE 0x80
#define INAND_CMD38_ARG_SECTRIM1 0x81
#define INAND_CMD38_ARG_SECTRIM2 0x88
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#define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
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#define MMC_SANITIZE_REQ_TIMEOUT 240000
#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
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#define mmc_req_rel_wr(req)	(((req->cmd_flags & REQ_FUA) || \
				  (req->cmd_flags & REQ_META)) && \
				  (rq_data_dir(req) == WRITE))
#define PACKED_CMD_VER	0x01
#define PACKED_CMD_WR	0x02

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static DEFINE_MUTEX(block_mutex);
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/*
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 * The defaults come from config options but can be overriden by module
 * or bootarg options.
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 */
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static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
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/*
 * We've only got one major, so number of mmcblk devices is
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 * limited to (1 << 20) / number of minors per device.  It is also
 * currently limited by the size of the static bitmaps below.
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 */
static int max_devices;

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#define MAX_DEVICES 256

/* TODO: Replace these with struct ida */
static DECLARE_BITMAP(dev_use, MAX_DEVICES);
static DECLARE_BITMAP(name_use, MAX_DEVICES);
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/*
 * There is one mmc_blk_data per slot.
 */
struct mmc_blk_data {
	spinlock_t	lock;
	struct gendisk	*disk;
	struct mmc_queue queue;
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	struct list_head part;
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	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 */
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#define MMC_BLK_PACKED_CMD	(1 << 2)	/* MMC packed command support */
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	unsigned int	usage;
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	unsigned int	read_only;
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	unsigned int	part_type;
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	unsigned int	name_idx;
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	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)
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	/*
	 * Only set in main mmc_blk_data associated
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	 * with mmc_card with dev_set_drvdata, and keeps
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	 * track of the current selected device partition.
	 */
	unsigned int	part_curr;
	struct device_attribute force_ro;
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	struct device_attribute power_ro_lock;
	int	area_type;
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};

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static DEFINE_MUTEX(open_lock);
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enum {
	MMC_PACKED_NR_IDX = -1,
	MMC_PACKED_NR_ZERO,
	MMC_PACKED_NR_SINGLE,
};

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module_param(perdev_minors, int, 0444);
MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");

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static inline int mmc_blk_part_switch(struct mmc_card *card,
				      struct mmc_blk_data *md);
static int get_card_status(struct mmc_card *card, u32 *status, int retries);

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static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
{
	struct mmc_packed *packed = mqrq->packed;

	BUG_ON(!packed);

	mqrq->cmd_type = MMC_PACKED_NONE;
	packed->nr_entries = MMC_PACKED_NR_ZERO;
	packed->idx_failure = MMC_PACKED_NR_IDX;
	packed->retries = 0;
	packed->blocks = 0;
}

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static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
{
	struct mmc_blk_data *md;

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	mutex_lock(&open_lock);
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	md = disk->private_data;
	if (md && md->usage == 0)
		md = NULL;
	if (md)
		md->usage++;
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	mutex_unlock(&open_lock);
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	return md;
}

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static inline int mmc_get_devidx(struct gendisk *disk)
{
	int devmaj = MAJOR(disk_devt(disk));
	int devidx = MINOR(disk_devt(disk)) / perdev_minors;

	if (!devmaj)
		devidx = disk->first_minor / perdev_minors;
	return devidx;
}

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static void mmc_blk_put(struct mmc_blk_data *md)
{
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	mutex_lock(&open_lock);
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	md->usage--;
	if (md->usage == 0) {
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		int devidx = mmc_get_devidx(md->disk);
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		blk_cleanup_queue(md->queue.queue);

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		__clear_bit(devidx, dev_use);

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		put_disk(md->disk);
		kfree(md);
	}
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	mutex_unlock(&open_lock);
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}

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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);

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	mmc_blk_put(md);

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	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_card *card;
	unsigned long set;

	if (kstrtoul(buf, 0, &set))
		return -EINVAL;

	if (set != 1)
		return count;

	md = mmc_blk_get(dev_to_disk(dev));
	card = md->queue.card;

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	mmc_get_card(card);
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	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;

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	mmc_put_card(card);
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	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);
			}
	}

	mmc_blk_put(md);
	return count;
}

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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));

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	ret = snprintf(buf, PAGE_SIZE, "%d\n",
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		       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;
}

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static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
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{
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	struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
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	int ret = -ENXIO;

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	mutex_lock(&block_mutex);
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	if (md) {
		if (md->usage == 2)
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			check_disk_change(bdev);
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		ret = 0;
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		if ((mode & FMODE_WRITE) && md->read_only) {
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			mmc_blk_put(md);
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			ret = -EROFS;
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		}
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	}
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	mutex_unlock(&block_mutex);
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	return ret;
}

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static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
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{
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	struct mmc_blk_data *md = disk->private_data;
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	mutex_lock(&block_mutex);
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	mmc_blk_put(md);
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	mutex_unlock(&block_mutex);
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}

static int
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mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
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{
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	geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
	geo->heads = 4;
	geo->sectors = 16;
	return 0;
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}

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struct mmc_blk_ioc_data {
	struct mmc_ioc_cmd ic;
	unsigned char *buf;
	u64 buf_bytes;
};

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 = kzalloc(sizeof(*idata), GFP_KERNEL);
	if (!idata) {
		err = -ENOMEM;
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		goto out;
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	}

	if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
		err = -EFAULT;
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		goto idata_err;
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	}

	idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
	if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
		err = -EOVERFLOW;
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		goto idata_err;
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	}

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	if (!idata->buf_bytes)
		return idata;

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	idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
	if (!idata->buf) {
		err = -ENOMEM;
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		goto idata_err;
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	}

	if (copy_from_user(idata->buf, (void __user *)(unsigned long)
					idata->ic.data_ptr, idata->buf_bytes)) {
		err = -EFAULT;
		goto copy_err;
	}

	return idata;

copy_err:
	kfree(idata->buf);
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idata_err:
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	kfree(idata);
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out:
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	return ERR_PTR(err);
}

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static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
				       u32 retries_max)
{
	int err;
	u32 retry_count = 0;

	if (!status || !retries_max)
		return -EINVAL;

	do {
		err = get_card_status(card, status, 5);
		if (err)
			break;

		if (!R1_STATUS(*status) &&
				(R1_CURRENT_STATE(*status) != R1_STATE_PRG))
			break; /* RPMB programming operation complete */

		/*
		 * Rechedule to give the MMC device a chance to continue
		 * processing the previous command without being polled too
		 * frequently.
		 */
		usleep_range(1000, 5000);
	} while (++retry_count < retries_max);

	if (retry_count == retries_max)
		err = -EPERM;

	return err;
}

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static int ioctl_do_sanitize(struct mmc_card *card)
{
	int err;

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	if (!mmc_can_sanitize(card)) {
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			pr_warn("%s: %s - SANITIZE is not supported\n",
				mmc_hostname(card->host), __func__);
			err = -EOPNOTSUPP;
			goto out;
	}

	pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
		mmc_hostname(card->host), __func__);

	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
					EXT_CSD_SANITIZE_START, 1,
					MMC_SANITIZE_REQ_TIMEOUT);

	if (err)
		pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
		       mmc_hostname(card->host), __func__, err);

	pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
					     __func__);
out:
	return err;
}

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static int mmc_blk_ioctl_cmd(struct block_device *bdev,
	struct mmc_ioc_cmd __user *ic_ptr)
{
	struct mmc_blk_ioc_data *idata;
	struct mmc_blk_data *md;
	struct mmc_card *card;
	struct mmc_command cmd = {0};
	struct mmc_data data = {0};
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	struct mmc_request mrq = {NULL};
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	struct scatterlist sg;
	int err;
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	int is_rpmb = false;
	u32 status = 0;
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	/*
	 * 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 != bdev->bd_contains))
		return -EPERM;

	idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
	if (IS_ERR(idata))
		return PTR_ERR(idata);

	md = mmc_blk_get(bdev->bd_disk);
	if (!md) {
		err = -EINVAL;
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		goto cmd_err;
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	}

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	if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
		is_rpmb = true;

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	card = md->queue.card;
	if (IS_ERR(card)) {
		err = PTR_ERR(card);
		goto cmd_done;
	}

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	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;

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	mmc_get_card(card);
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	err = mmc_blk_part_switch(card, md);
	if (err)
		goto cmd_rel_host;

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	if (idata->ic.is_acmd) {
		err = mmc_app_cmd(card->host, card);
		if (err)
			goto cmd_rel_host;
	}

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	if (is_rpmb) {
		err = mmc_set_blockcount(card, data.blocks,
			idata->ic.write_flag & (1 << 31));
		if (err)
			goto cmd_rel_host;
	}

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	if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
	    (cmd.opcode == MMC_SWITCH)) {
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		err = ioctl_do_sanitize(card);

		if (err)
			pr_err("%s: ioctl_do_sanitize() failed. err = %d",
			       __func__, err);

		goto cmd_rel_host;
	}

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	mmc_wait_for_req(card->host, &mrq);

	if (cmd.error) {
		dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
						__func__, cmd.error);
		err = cmd.error;
		goto cmd_rel_host;
	}
	if (data.error) {
		dev_err(mmc_dev(card->host), "%s: data error %d\n",
						__func__, data.error);
		err = data.error;
		goto cmd_rel_host;
	}

	/*
	 * 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 (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
		err = -EFAULT;
		goto cmd_rel_host;
	}

	if (!idata->ic.write_flag) {
		if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
						idata->buf, idata->buf_bytes)) {
			err = -EFAULT;
			goto cmd_rel_host;
		}
	}

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	if (is_rpmb) {
		/*
		 * Ensure RPMB command has completed by polling CMD13
		 * "Send Status".
		 */
		err = ioctl_rpmb_card_status_poll(card, &status, 5);
		if (err)
			dev_err(mmc_dev(card->host),
					"%s: Card Status=0x%08X, error %d\n",
					__func__, status, err);
	}

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cmd_rel_host:
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	mmc_put_card(card);
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cmd_done:
	mmc_blk_put(md);
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cmd_err:
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	kfree(idata->buf);
	kfree(idata);
	return err;
}

static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
	unsigned int cmd, unsigned long arg)
{
	int ret = -EINVAL;
	if (cmd == MMC_IOC_CMD)
		ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
	return ret;
}

#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

638
static const struct block_device_operations mmc_bdops = {
A
Al Viro 已提交
639 640
	.open			= mmc_blk_open,
	.release		= mmc_blk_release,
641
	.getgeo			= mmc_blk_getgeo,
L
Linus Torvalds 已提交
642
	.owner			= THIS_MODULE,
643 644 645 646
	.ioctl			= mmc_blk_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl		= mmc_blk_compat_ioctl,
#endif
L
Linus Torvalds 已提交
647 648
};

649 650 651 652
static inline int mmc_blk_part_switch(struct mmc_card *card,
				      struct mmc_blk_data *md)
{
	int ret;
653
	struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
654

655 656 657 658
	if (main_md->part_curr == md->part_type)
		return 0;

	if (mmc_card_mmc(card)) {
659 660 661 662
		u8 part_config = card->ext_csd.part_config;

		part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
		part_config |= md->part_type;
663 664

		ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
665
				 EXT_CSD_PART_CONFIG, part_config,
666 667 668
				 card->ext_csd.part_time);
		if (ret)
			return ret;
669 670

		card->ext_csd.part_config = part_config;
671
	}
672 673 674 675 676

	main_md->part_curr = md->part_type;
	return 0;
}

677 678 679
static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
{
	int err;
B
Ben Dooks 已提交
680 681
	u32 result;
	__be32 *blocks;
682

683
	struct mmc_request mrq = {NULL};
684
	struct mmc_command cmd = {0};
685
	struct mmc_data data = {0};
686 687 688 689 690

	struct scatterlist sg;

	cmd.opcode = MMC_APP_CMD;
	cmd.arg = card->rca << 16;
D
David Brownell 已提交
691
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
692 693

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
D
David Brownell 已提交
694 695 696
	if (err)
		return (u32)-1;
	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
697 698 699 700 701 702
		return (u32)-1;

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
	cmd.arg = 0;
D
David Brownell 已提交
703
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
704 705 706 707 708 709

	data.blksz = 4;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;
710
	mmc_set_data_timeout(&data, card);
711 712 713 714

	mrq.cmd = &cmd;
	mrq.data = &data;

B
Ben Dooks 已提交
715 716 717 718 719
	blocks = kmalloc(4, GFP_KERNEL);
	if (!blocks)
		return (u32)-1;

	sg_init_one(&sg, blocks, 4);
720 721 722

	mmc_wait_for_req(card->host, &mrq);

B
Ben Dooks 已提交
723 724 725
	result = ntohl(*blocks);
	kfree(blocks);

P
Pierre Ossman 已提交
726
	if (cmd.error || data.error)
B
Ben Dooks 已提交
727
		result = (u32)-1;
728

B
Ben Dooks 已提交
729
	return result;
730 731
}

732
static int get_card_status(struct mmc_card *card, u32 *status, int retries)
733
{
734
	struct mmc_command cmd = {0};
735 736 737 738 739 740
	int err;

	cmd.opcode = MMC_SEND_STATUS;
	if (!mmc_host_is_spi(card->host))
		cmd.arg = card->rca << 16;
	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
741 742 743 744
	err = mmc_wait_for_cmd(card->host, &cmd, retries);
	if (err == 0)
		*status = cmd.resp[0];
	return err;
745 746
}

747
static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
748
		bool hw_busy_detect, struct request *req, int *gen_err)
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
{
	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
	int err = 0;
	u32 status;

	do {
		err = get_card_status(card, &status, 5);
		if (err) {
			pr_err("%s: error %d requesting status\n",
			       req->rq_disk->disk_name, err);
			return err;
		}

		if (status & R1_ERROR) {
			pr_err("%s: %s: error sending status cmd, status %#x\n",
				req->rq_disk->disk_name, __func__, status);
			*gen_err = 1;
		}

768 769 770 771 772
		/* We may rely on the host hw to handle busy detection.*/
		if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
			hw_busy_detect)
			break;

773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794
		/*
		 * Timeout if the device never becomes ready for data and never
		 * leaves the program state.
		 */
		if (time_after(jiffies, timeout)) {
			pr_err("%s: Card stuck in programming state! %s %s\n",
				mmc_hostname(card->host),
				req->rq_disk->disk_name, __func__);
			return -ETIMEDOUT;
		}

		/*
		 * Some cards mishandle the status bits,
		 * so make sure to check both the busy
		 * indication and the card state.
		 */
	} while (!(status & R1_READY_FOR_DATA) ||
		 (R1_CURRENT_STATE(status) == R1_STATE_PRG));

	return err;
}

795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
		struct request *req, int *gen_err, u32 *stop_status)
{
	struct mmc_host *host = card->host;
	struct mmc_command cmd = {0};
	int err;
	bool use_r1b_resp = rq_data_dir(req) == WRITE;

	/*
	 * Normally we use R1B responses for WRITE, but in cases where the host
	 * has specified a max_busy_timeout we need to validate it. A failure
	 * means we need to prevent the host from doing hw busy detection, which
	 * is done by converting to a R1 response instead.
	 */
	if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
		use_r1b_resp = false;

	cmd.opcode = MMC_STOP_TRANSMISSION;
	if (use_r1b_resp) {
		cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
		cmd.busy_timeout = timeout_ms;
	} else {
		cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
	}

	err = mmc_wait_for_cmd(host, &cmd, 5);
	if (err)
		return err;

	*stop_status = cmd.resp[0];

	/* No need to check card status in case of READ. */
	if (rq_data_dir(req) == READ)
		return 0;

	if (!mmc_host_is_spi(host) &&
		(*stop_status & R1_ERROR)) {
		pr_err("%s: %s: general error sending stop command, resp %#x\n",
			req->rq_disk->disk_name, __func__, *stop_status);
		*gen_err = 1;
	}

	return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
}

840
#define ERR_NOMEDIUM	3
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901
#define ERR_RETRY	2
#define ERR_ABORT	1
#define ERR_CONTINUE	0

static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
	bool status_valid, u32 status)
{
	switch (error) {
	case -EILSEQ:
		/* response crc error, retry the r/w cmd */
		pr_err("%s: %s sending %s command, card status %#x\n",
			req->rq_disk->disk_name, "response CRC error",
			name, status);
		return ERR_RETRY;

	case -ETIMEDOUT:
		pr_err("%s: %s sending %s command, card status %#x\n",
			req->rq_disk->disk_name, "timed out", name, status);

		/* If the status cmd initially failed, retry the r/w cmd */
		if (!status_valid)
			return ERR_RETRY;

		/*
		 * If it was a r/w cmd crc error, or illegal command
		 * (eg, issued in wrong state) then retry - we should
		 * have corrected the state problem above.
		 */
		if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
			return ERR_RETRY;

		/* Otherwise abort the command */
		return ERR_ABORT;

	default:
		/* We don't understand the error code the driver gave us */
		pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
		       req->rq_disk->disk_name, error, status);
		return ERR_ABORT;
	}
}

/*
 * Initial r/w and stop cmd error recovery.
 * We don't know whether the card received the r/w cmd or not, so try to
 * restore things back to a sane state.  Essentially, we do this as follows:
 * - Obtain card status.  If the first attempt to obtain card status fails,
 *   the status word will reflect the failed status cmd, not the failed
 *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 *   longer communicate with the card.
 * - Check the card state.  If the card received the cmd but there was a
 *   transient problem with the response, it might still be in a data transfer
 *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 * - If the r/w cmd failed due to a response CRC error, it was probably
 *   transient, so retry the cmd.
 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 *   illegal cmd, retry.
 * Otherwise we don't understand what happened, so abort.
 */
static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
902
	struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
903 904 905 906 907
{
	bool prev_cmd_status_valid = true;
	u32 status, stop_status = 0;
	int err, retry;

908 909 910
	if (mmc_card_removed(card))
		return ERR_NOMEDIUM;

911 912 913 914 915 916 917 918 919 920
	/*
	 * Try to get card status which indicates both the card state
	 * and why there was no response.  If the first attempt fails,
	 * we can't be sure the returned status is for the r/w command.
	 */
	for (retry = 2; retry >= 0; retry--) {
		err = get_card_status(card, &status, 0);
		if (!err)
			break;

921 922 923
		/* Re-tune if needed */
		mmc_retune_recheck(card->host);

924 925 926 927 928 929
		prev_cmd_status_valid = false;
		pr_err("%s: error %d sending status command, %sing\n",
		       req->rq_disk->disk_name, err, retry ? "retry" : "abort");
	}

	/* We couldn't get a response from the card.  Give up. */
930 931 932 933
	if (err) {
		/* Check if the card is removed */
		if (mmc_detect_card_removed(card->host))
			return ERR_NOMEDIUM;
934
		return ERR_ABORT;
935
	}
936

937 938 939 940 941 942
	/* Flag ECC errors */
	if ((status & R1_CARD_ECC_FAILED) ||
	    (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
	    (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
		*ecc_err = 1;

943 944 945 946 947 948 949 950 951 952
	/* Flag General errors */
	if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
		if ((status & R1_ERROR) ||
			(brq->stop.resp[0] & R1_ERROR)) {
			pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
			       req->rq_disk->disk_name, __func__,
			       brq->stop.resp[0], status);
			*gen_err = 1;
		}

953 954 955 956 957 958
	/*
	 * Check the current card state.  If it is in some data transfer
	 * mode, tell it to stop (and hopefully transition back to TRAN.)
	 */
	if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
	    R1_CURRENT_STATE(status) == R1_STATE_RCV) {
959 960 961 962
		err = send_stop(card,
			DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
			req, gen_err, &stop_status);
		if (err) {
963 964
			pr_err("%s: error %d sending stop command\n",
			       req->rq_disk->disk_name, err);
965 966 967 968
			/*
			 * If the stop cmd also timed out, the card is probably
			 * not present, so abort. Other errors are bad news too.
			 */
969
			return ERR_ABORT;
970 971
		}

972 973
		if (stop_status & R1_CARD_ECC_FAILED)
			*ecc_err = 1;
974 975 976 977 978 979 980 981 982 983 984 985
	}

	/* Check for set block count errors */
	if (brq->sbc.error)
		return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
				prev_cmd_status_valid, status);

	/* Check for r/w command errors */
	if (brq->cmd.error)
		return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
				prev_cmd_status_valid, status);

986 987 988 989
	/* Data errors */
	if (!brq->stop.error)
		return ERR_CONTINUE;

990
	/* Now for stop errors.  These aren't fatal to the transfer. */
991
	pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
	       req->rq_disk->disk_name, brq->stop.error,
	       brq->cmd.resp[0], status);

	/*
	 * Subsitute in our own stop status as this will give the error
	 * state which happened during the execution of the r/w command.
	 */
	if (stop_status) {
		brq->stop.resp[0] = stop_status;
		brq->stop.error = 0;
	}
	return ERR_CONTINUE;
}

1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
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) {
1018 1019
		struct mmc_blk_data *main_md =
			dev_get_drvdata(&host->card->dev);
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
		int part_err;

		main_md->part_curr = main_md->part_type;
		part_err = mmc_blk_part_switch(host->card, md);
		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;
}

1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
int mmc_access_rpmb(struct mmc_queue *mq)
{
	struct mmc_blk_data *md = mq->data;
	/*
	 * If this is a RPMB partition access, return ture
	 */
	if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
		return true;

	return false;
}

A
Adrian Hunter 已提交
1052 1053 1054 1055 1056
static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
	unsigned int from, nr, arg;
1057
	int err = 0, type = MMC_BLK_DISCARD;
A
Adrian Hunter 已提交
1058 1059 1060 1061 1062 1063 1064 1065 1066

	if (!mmc_can_erase(card)) {
		err = -EOPNOTSUPP;
		goto out;
	}

	from = blk_rq_pos(req);
	nr = blk_rq_sectors(req);

1067 1068 1069
	if (mmc_can_discard(card))
		arg = MMC_DISCARD_ARG;
	else if (mmc_can_trim(card))
A
Adrian Hunter 已提交
1070 1071 1072
		arg = MMC_TRIM_ARG;
	else
		arg = MMC_ERASE_ARG;
1073
retry:
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
	if (card->quirks & MMC_QUIRK_INAND_CMD38) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
				 INAND_CMD38_ARG_EXT_CSD,
				 arg == MMC_TRIM_ARG ?
				 INAND_CMD38_ARG_TRIM :
				 INAND_CMD38_ARG_ERASE,
				 0);
		if (err)
			goto out;
	}
A
Adrian Hunter 已提交
1084 1085
	err = mmc_erase(card, from, nr, arg);
out:
1086 1087 1088 1089
	if (err == -EIO && !mmc_blk_reset(md, card->host, type))
		goto retry;
	if (!err)
		mmc_blk_reset_success(md, type);
1090
	blk_end_request(req, err, blk_rq_bytes(req));
A
Adrian Hunter 已提交
1091 1092 1093 1094

	return err ? 0 : 1;
}

1095 1096 1097 1098 1099
static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
				       struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
1100
	unsigned int from, nr, arg;
1101
	int err = 0, type = MMC_BLK_SECDISCARD;
1102

1103
	if (!(mmc_can_secure_erase_trim(card))) {
1104 1105 1106 1107
		err = -EOPNOTSUPP;
		goto out;
	}

1108 1109 1110
	from = blk_rq_pos(req);
	nr = blk_rq_sectors(req);

1111 1112 1113 1114
	if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
		arg = MMC_SECURE_TRIM1_ARG;
	else
		arg = MMC_SECURE_ERASE_ARG;
1115

1116
retry:
1117 1118 1119 1120 1121 1122 1123 1124
	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,
				 0);
		if (err)
1125
			goto out_retry;
1126
	}
1127

1128
	err = mmc_erase(card, from, nr, arg);
1129 1130 1131 1132 1133 1134
	if (err == -EIO)
		goto out_retry;
	if (err)
		goto out;

	if (arg == MMC_SECURE_TRIM1_ARG) {
1135 1136 1137 1138 1139 1140
		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,
					 0);
			if (err)
1141
				goto out_retry;
1142
		}
1143

1144
		err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1145 1146 1147 1148
		if (err == -EIO)
			goto out_retry;
		if (err)
			goto out;
1149
	}
1150 1151 1152

out_retry:
	if (err && !mmc_blk_reset(md, card->host, type))
1153 1154 1155
		goto retry;
	if (!err)
		mmc_blk_reset_success(md, type);
1156
out:
1157
	blk_end_request(req, err, blk_rq_bytes(req));
1158 1159 1160 1161

	return err ? 0 : 1;
}

A
Andrei Warkentin 已提交
1162 1163 1164
static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
1165 1166 1167 1168 1169 1170
	struct mmc_card *card = md->queue.card;
	int ret = 0;

	ret = mmc_flush_cache(card);
	if (ret)
		ret = -EIO;
A
Andrei Warkentin 已提交
1171

1172
	blk_end_request_all(req, ret);
A
Andrei Warkentin 已提交
1173

1174
	return ret ? 0 : 1;
A
Andrei Warkentin 已提交
1175 1176 1177 1178 1179 1180 1181 1182 1183
}

/*
 * 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.
 */
1184 1185 1186
static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
				    struct mmc_card *card,
				    struct request *req)
A
Andrei Warkentin 已提交
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
{
	if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
		/* Legacy mode imposes restrictions on transfers. */
		if (!IS_ALIGNED(brq->cmd.arg, 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;
	}
}

1200 1201 1202 1203 1204 1205 1206 1207
#define CMD_ERRORS							\
	(R1_OUT_OF_RANGE |	/* Command argument out of range */	\
	 R1_ADDRESS_ERROR |	/* Misaligned address */		\
	 R1_BLOCK_LEN_ERROR |	/* Transferred block length incorrect */\
	 R1_WP_VIOLATION |	/* Tried to write to protected block */	\
	 R1_CC_ERROR |		/* Card controller error */		\
	 R1_ERROR)		/* General/unknown error */

1208 1209
static int mmc_blk_err_check(struct mmc_card *card,
			     struct mmc_async_req *areq)
1210
{
1211 1212 1213 1214
	struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
						    mmc_active);
	struct mmc_blk_request *brq = &mq_mrq->brq;
	struct request *req = mq_mrq->req;
1215
	int need_retune = card->host->need_retune;
1216
	int ecc_err = 0, gen_err = 0;
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227

	/*
	 * sbc.error indicates a problem with the set block count
	 * command.  No data will have been transferred.
	 *
	 * cmd.error indicates a problem with the r/w command.  No
	 * data will have been transferred.
	 *
	 * stop.error indicates a problem with the stop command.  Data
	 * may have been transferred, or may still be transferring.
	 */
1228 1229
	if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
	    brq->data.error) {
1230
		switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1231 1232 1233 1234
		case ERR_RETRY:
			return MMC_BLK_RETRY;
		case ERR_ABORT:
			return MMC_BLK_ABORT;
1235 1236
		case ERR_NOMEDIUM:
			return MMC_BLK_NOMEDIUM;
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
		case ERR_CONTINUE:
			break;
		}
	}

	/*
	 * Check for errors relating to the execution of the
	 * initial command - such as address errors.  No data
	 * has been transferred.
	 */
	if (brq->cmd.resp[0] & CMD_ERRORS) {
		pr_err("%s: r/w command failed, status = %#x\n",
		       req->rq_disk->disk_name, brq->cmd.resp[0]);
		return MMC_BLK_ABORT;
	}

	/*
	 * Everything else is either success, or a data error of some
	 * kind.  If it was a write, we may have transitioned to
	 * program mode, which we have to wait for it to complete.
	 */
	if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1259
		int err;
1260

1261 1262 1263 1264 1265 1266 1267 1268
		/* Check stop command response */
		if (brq->stop.resp[0] & R1_ERROR) {
			pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
			       req->rq_disk->disk_name, __func__,
			       brq->stop.resp[0]);
			gen_err = 1;
		}

1269 1270
		err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
					&gen_err);
1271 1272
		if (err)
			return MMC_BLK_CMD_ERR;
1273 1274
	}

1275 1276 1277 1278 1279 1280 1281
	/* if general error occurs, retry the write operation. */
	if (gen_err) {
		pr_warn("%s: retrying write for general error\n",
				req->rq_disk->disk_name);
		return MMC_BLK_RETRY;
	}

1282
	if (brq->data.error) {
1283 1284 1285 1286 1287 1288
		if (need_retune && !brq->retune_retry_done) {
			pr_info("%s: retrying because a re-tune was needed\n",
				req->rq_disk->disk_name);
			brq->retune_retry_done = 1;
			return MMC_BLK_RETRY;
		}
1289 1290 1291 1292 1293 1294 1295
		pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
		       req->rq_disk->disk_name, brq->data.error,
		       (unsigned)blk_rq_pos(req),
		       (unsigned)blk_rq_sectors(req),
		       brq->cmd.resp[0], brq->stop.resp[0]);

		if (rq_data_dir(req) == READ) {
1296 1297
			if (ecc_err)
				return MMC_BLK_ECC_ERR;
1298 1299 1300 1301 1302 1303
			return MMC_BLK_DATA_ERR;
		} else {
			return MMC_BLK_CMD_ERR;
		}
	}

1304 1305
	if (!brq->data.bytes_xfered)
		return MMC_BLK_RETRY;
1306

1307 1308 1309 1310 1311 1312 1313
	if (mmc_packed_cmd(mq_mrq->cmd_type)) {
		if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
			return MMC_BLK_PARTIAL;
		else
			return MMC_BLK_SUCCESS;
	}

1314 1315 1316 1317
	if (blk_rq_bytes(req) != brq->data.bytes_xfered)
		return MMC_BLK_PARTIAL;

	return MMC_BLK_SUCCESS;
1318 1319
}

1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
static int mmc_blk_packed_err_check(struct mmc_card *card,
				    struct mmc_async_req *areq)
{
	struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
			mmc_active);
	struct request *req = mq_rq->req;
	struct mmc_packed *packed = mq_rq->packed;
	int err, check, status;
	u8 *ext_csd;

	BUG_ON(!packed);

	packed->retries--;
	check = mmc_blk_err_check(card, areq);
	err = get_card_status(card, &status, 0);
	if (err) {
		pr_err("%s: error %d sending status command\n",
		       req->rq_disk->disk_name, err);
		return MMC_BLK_ABORT;
	}

	if (status & R1_EXCEPTION_EVENT) {
1342
		err = mmc_get_ext_csd(card, &ext_csd);
1343 1344 1345
		if (err) {
			pr_err("%s: error %d sending ext_csd\n",
			       req->rq_disk->disk_name, err);
1346
			return MMC_BLK_ABORT;
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369
		}

		if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
		     EXT_CSD_PACKED_FAILURE) &&
		    (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
		     EXT_CSD_PACKED_GENERIC_ERROR)) {
			if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
			    EXT_CSD_PACKED_INDEXED_ERROR) {
				packed->idx_failure =
				  ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
				check = MMC_BLK_PARTIAL;
			}
			pr_err("%s: packed cmd failed, nr %u, sectors %u, "
			       "failure index: %d\n",
			       req->rq_disk->disk_name, packed->nr_entries,
			       packed->blocks, packed->idx_failure);
		}
		kfree(ext_csd);
	}

	return check;
}

1370 1371 1372 1373
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
			       struct mmc_card *card,
			       int disable_multi,
			       struct mmc_queue *mq)
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Linus Torvalds 已提交
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{
1375 1376 1377
	u32 readcmd, writecmd;
	struct mmc_blk_request *brq = &mqrq->brq;
	struct request *req = mqrq->req;
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1378
	struct mmc_blk_data *md = mq->data;
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	bool do_data_tag;
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1381 1382 1383
	/*
	 * Reliable writes are used to implement Forced Unit Access and
	 * REQ_META accesses, and are supported only on MMCs.
1384 1385 1386
	 *
	 * XXX: this really needs a good explanation of why REQ_META
	 * is treated special.
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Andrei Warkentin 已提交
1387 1388 1389 1390
	 */
	bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
			  (req->cmd_flags & REQ_META)) &&
		(rq_data_dir(req) == WRITE) &&
1391
		(md->flags & MMC_BLK_REL_WR);
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Andrei Warkentin 已提交
1392

1393 1394 1395
	memset(brq, 0, sizeof(struct mmc_blk_request));
	brq->mrq.cmd = &brq->cmd;
	brq->mrq.data = &brq->data;
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Linus Torvalds 已提交
1396

1397 1398 1399 1400 1401 1402 1403 1404
	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;
	brq->data.blksz = 512;
	brq->stop.opcode = MMC_STOP_TRANSMISSION;
	brq->stop.arg = 0;
	brq->data.blocks = blk_rq_sectors(req);
1405

1406 1407 1408 1409 1410 1411 1412
	/*
	 * 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;
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Linus Torvalds 已提交
1413

1414 1415 1416 1417 1418 1419 1420 1421 1422
	if (brq->data.blocks > 1) {
		/*
		 * 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 (disable_multi)
			brq->data.blocks = 1;

1423 1424 1425 1426 1427 1428 1429 1430 1431
		/*
		 * 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);
1432
	}
1433

1434 1435 1436
	if (brq->data.blocks > 1 || do_rel_wr) {
		/* SPI multiblock writes terminate using a special
		 * token, not a STOP_TRANSMISSION request.
1437
		 */
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
		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;
	}
	if (rq_data_dir(req) == READ) {
		brq->cmd.opcode = readcmd;
		brq->data.flags |= MMC_DATA_READ;
1451 1452 1453
		if (brq->mrq.stop)
			brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
					MMC_CMD_AC;
1454 1455 1456
	} else {
		brq->cmd.opcode = writecmd;
		brq->data.flags |= MMC_DATA_WRITE;
1457 1458 1459
		if (brq->mrq.stop)
			brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
					MMC_CMD_AC;
1460
	}
1461

1462 1463
	if (do_rel_wr)
		mmc_apply_rel_rw(brq, card, req);
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Andrei Warkentin 已提交
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1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
	/*
	 * 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);

1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
	/*
	 * 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.
	 */
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1493 1494 1495
	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)) {
1496 1497
		brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
		brq->sbc.arg = brq->data.blocks |
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1498 1499
			(do_rel_wr ? (1 << 31) : 0) |
			(do_data_tag ? (1 << 29) : 0);
1500 1501 1502
		brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
		brq->mrq.sbc = &brq->sbc;
	}
1503

1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
	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;
1523 1524
			}
		}
1525 1526 1527
		brq->data.sg_len = i;
	}

1528 1529 1530
	mqrq->mmc_active.mrq = &brq->mrq;
	mqrq->mmc_active.err_check = mmc_blk_err_check;

1531 1532
	mmc_queue_bounce_pre(mqrq);
}
1533

1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
					  struct mmc_card *card)
{
	unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
	unsigned int max_seg_sz = queue_max_segment_size(q);
	unsigned int len, nr_segs = 0;

	do {
		len = min(hdr_sz, max_seg_sz);
		hdr_sz -= len;
		nr_segs++;
	} while (hdr_sz);

	return nr_segs;
}

static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
{
	struct request_queue *q = mq->queue;
	struct mmc_card *card = mq->card;
	struct request *cur = req, *next = NULL;
	struct mmc_blk_data *md = mq->data;
	struct mmc_queue_req *mqrq = mq->mqrq_cur;
	bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
	unsigned int req_sectors = 0, phys_segments = 0;
	unsigned int max_blk_count, max_phys_segs;
	bool put_back = true;
	u8 max_packed_rw = 0;
	u8 reqs = 0;

	if (!(md->flags & MMC_BLK_PACKED_CMD))
		goto no_packed;

	if ((rq_data_dir(cur) == WRITE) &&
	    mmc_host_packed_wr(card->host))
		max_packed_rw = card->ext_csd.max_packed_writes;

	if (max_packed_rw == 0)
		goto no_packed;

	if (mmc_req_rel_wr(cur) &&
	    (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
		goto no_packed;

	if (mmc_large_sector(card) &&
	    !IS_ALIGNED(blk_rq_sectors(cur), 8))
		goto no_packed;

	mmc_blk_clear_packed(mqrq);

	max_blk_count = min(card->host->max_blk_count,
			    card->host->max_req_size >> 9);
	if (unlikely(max_blk_count > 0xffff))
		max_blk_count = 0xffff;

	max_phys_segs = queue_max_segments(q);
	req_sectors += blk_rq_sectors(cur);
	phys_segments += cur->nr_phys_segments;

	if (rq_data_dir(cur) == WRITE) {
		req_sectors += mmc_large_sector(card) ? 8 : 1;
		phys_segments += mmc_calc_packed_hdr_segs(q, card);
	}

	do {
		if (reqs >= max_packed_rw - 1) {
			put_back = false;
			break;
		}

		spin_lock_irq(q->queue_lock);
		next = blk_fetch_request(q);
		spin_unlock_irq(q->queue_lock);
		if (!next) {
			put_back = false;
			break;
		}

		if (mmc_large_sector(card) &&
		    !IS_ALIGNED(blk_rq_sectors(next), 8))
			break;

		if (next->cmd_flags & REQ_DISCARD ||
		    next->cmd_flags & REQ_FLUSH)
			break;

		if (rq_data_dir(cur) != rq_data_dir(next))
			break;

		if (mmc_req_rel_wr(next) &&
		    (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
			break;

		req_sectors += blk_rq_sectors(next);
		if (req_sectors > max_blk_count)
			break;

		phys_segments +=  next->nr_phys_segments;
		if (phys_segments > max_phys_segs)
			break;

		list_add_tail(&next->queuelist, &mqrq->packed->list);
		cur = next;
		reqs++;
	} while (1);

	if (put_back) {
		spin_lock_irq(q->queue_lock);
		blk_requeue_request(q, next);
		spin_unlock_irq(q->queue_lock);
	}

	if (reqs > 0) {
		list_add(&req->queuelist, &mqrq->packed->list);
		mqrq->packed->nr_entries = ++reqs;
		mqrq->packed->retries = reqs;
		return reqs;
	}

no_packed:
	mqrq->cmd_type = MMC_PACKED_NONE;
	return 0;
}

static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
					struct mmc_card *card,
					struct mmc_queue *mq)
{
	struct mmc_blk_request *brq = &mqrq->brq;
	struct request *req = mqrq->req;
	struct request *prq;
	struct mmc_blk_data *md = mq->data;
	struct mmc_packed *packed = mqrq->packed;
	bool do_rel_wr, do_data_tag;
	u32 *packed_cmd_hdr;
	u8 hdr_blocks;
	u8 i = 1;

	BUG_ON(!packed);

	mqrq->cmd_type = MMC_PACKED_WRITE;
	packed->blocks = 0;
	packed->idx_failure = MMC_PACKED_NR_IDX;

	packed_cmd_hdr = packed->cmd_hdr;
	memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
	packed_cmd_hdr[0] = (packed->nr_entries << 16) |
		(PACKED_CMD_WR << 8) | PACKED_CMD_VER;
	hdr_blocks = mmc_large_sector(card) ? 8 : 1;

	/*
	 * Argument for each entry of packed group
	 */
	list_for_each_entry(prq, &packed->list, queuelist) {
		do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
		do_data_tag = (card->ext_csd.data_tag_unit_size) &&
			(prq->cmd_flags & REQ_META) &&
			(rq_data_dir(prq) == WRITE) &&
			((brq->data.blocks * brq->data.blksz) >=
			 card->ext_csd.data_tag_unit_size);
		/* Argument of CMD23 */
		packed_cmd_hdr[(i * 2)] =
			(do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
			(do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
			blk_rq_sectors(prq);
		/* Argument of CMD18 or CMD25 */
		packed_cmd_hdr[((i * 2)) + 1] =
			mmc_card_blockaddr(card) ?
			blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
		packed->blocks += blk_rq_sectors(prq);
		i++;
	}

	memset(brq, 0, sizeof(struct mmc_blk_request));
	brq->mrq.cmd = &brq->cmd;
	brq->mrq.data = &brq->data;
	brq->mrq.sbc = &brq->sbc;
	brq->mrq.stop = &brq->stop;

	brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
	brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
	brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;

	brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
	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;

	brq->data.blksz = 512;
	brq->data.blocks = packed->blocks + hdr_blocks;
	brq->data.flags |= MMC_DATA_WRITE;

	brq->stop.opcode = MMC_STOP_TRANSMISSION;
	brq->stop.arg = 0;
	brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;

	mmc_set_data_timeout(&brq->data, card);

	brq->data.sg = mqrq->sg;
	brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);

	mqrq->mmc_active.mrq = &brq->mrq;
	mqrq->mmc_active.err_check = mmc_blk_packed_err_check;

	mmc_queue_bounce_pre(mqrq);
}

1742 1743 1744 1745
static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
			   struct mmc_blk_request *brq, struct request *req,
			   int ret)
{
1746 1747 1748
	struct mmc_queue_req *mq_rq;
	mq_rq = container_of(brq, struct mmc_queue_req, brq);

1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	/*
	 * If this is an SD card and we're writing, we can first
	 * mark the known good sectors as ok.
	 *
	 * If the card is not SD, we can still ok written sectors
	 * as reported by the controller (which might be less than
	 * the real number of written sectors, but never more).
	 */
	if (mmc_card_sd(card)) {
		u32 blocks;

		blocks = mmc_sd_num_wr_blocks(card);
		if (blocks != (u32)-1) {
1762
			ret = blk_end_request(req, 0, blocks << 9);
1763 1764
		}
	} else {
1765 1766
		if (!mmc_packed_cmd(mq_rq->cmd_type))
			ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1767 1768 1769 1770
	}
	return ret;
}

1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
{
	struct request *prq;
	struct mmc_packed *packed = mq_rq->packed;
	int idx = packed->idx_failure, i = 0;
	int ret = 0;

	BUG_ON(!packed);

	while (!list_empty(&packed->list)) {
		prq = list_entry_rq(packed->list.next);
		if (idx == i) {
			/* retry from error index */
			packed->nr_entries -= idx;
			mq_rq->req = prq;
			ret = 1;

			if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
				list_del_init(&prq->queuelist);
				mmc_blk_clear_packed(mq_rq);
			}
			return ret;
		}
		list_del_init(&prq->queuelist);
		blk_end_request(prq, 0, blk_rq_bytes(prq));
		i++;
	}

	mmc_blk_clear_packed(mq_rq);
	return ret;
}

static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
{
	struct request *prq;
	struct mmc_packed *packed = mq_rq->packed;

	BUG_ON(!packed);

	while (!list_empty(&packed->list)) {
		prq = list_entry_rq(packed->list.next);
		list_del_init(&prq->queuelist);
		blk_end_request(prq, -EIO, blk_rq_bytes(prq));
	}

	mmc_blk_clear_packed(mq_rq);
}

static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
				      struct mmc_queue_req *mq_rq)
{
	struct request *prq;
	struct request_queue *q = mq->queue;
	struct mmc_packed *packed = mq_rq->packed;

	BUG_ON(!packed);

	while (!list_empty(&packed->list)) {
		prq = list_entry_rq(packed->list.prev);
		if (prq->queuelist.prev != &packed->list) {
			list_del_init(&prq->queuelist);
			spin_lock_irq(q->queue_lock);
			blk_requeue_request(mq->queue, prq);
			spin_unlock_irq(q->queue_lock);
		} else {
			list_del_init(&prq->queuelist);
		}
	}

	mmc_blk_clear_packed(mq_rq);
}

1843
static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1844 1845 1846 1847
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
	struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1848
	int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1849
	enum mmc_blk_status status;
1850
	struct mmc_queue_req *mq_rq;
1851
	struct request *req = rqc;
1852
	struct mmc_async_req *areq;
1853 1854
	const u8 packed_nr = 2;
	u8 reqs = 0;
L
Linus Torvalds 已提交
1855

1856 1857
	if (!rqc && !mq->mqrq_prev->req)
		return 0;
1858

1859 1860 1861
	if (rqc)
		reqs = mmc_blk_prep_packed_list(mq, rqc);

1862 1863
	do {
		if (rqc) {
1864 1865 1866 1867 1868 1869 1870 1871
			/*
			 * When 4KB native sector is enabled, only 8 blocks
			 * multiple read or write is allowed
			 */
			if ((brq->data.blocks & 0x07) &&
			    (card->ext_csd.data_sector_size == 4096)) {
				pr_err("%s: Transfer size is not 4KB sector size aligned\n",
					req->rq_disk->disk_name);
1872
				mq_rq = mq->mqrq_cur;
1873 1874
				goto cmd_abort;
			}
1875 1876 1877 1878 1879 1880

			if (reqs >= packed_nr)
				mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
							    card, mq);
			else
				mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1881 1882 1883 1884
			areq = &mq->mqrq_cur->mmc_active;
		} else
			areq = NULL;
		areq = mmc_start_req(card->host, areq, (int *) &status);
1885 1886 1887
		if (!areq) {
			if (status == MMC_BLK_NEW_REQUEST)
				mq->flags |= MMC_QUEUE_NEW_REQUEST;
1888
			return 0;
1889
		}
1890 1891 1892 1893

		mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
		brq = &mq_rq->brq;
		req = mq_rq->req;
1894
		type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1895
		mmc_queue_bounce_post(mq_rq);
1896

1897 1898 1899 1900 1901 1902
		switch (status) {
		case MMC_BLK_SUCCESS:
		case MMC_BLK_PARTIAL:
			/*
			 * A block was successfully transferred.
			 */
1903
			mmc_blk_reset_success(md, type);
1904 1905 1906 1907 1908 1909

			if (mmc_packed_cmd(mq_rq->cmd_type)) {
				ret = mmc_blk_end_packed_req(mq_rq);
				break;
			} else {
				ret = blk_end_request(req, 0,
1910
						brq->data.bytes_xfered);
1911 1912
			}

1913 1914 1915 1916 1917
			/*
			 * If the blk_end_request function returns non-zero even
			 * though all data has been transferred and no errors
			 * were returned by the host controller, it's a bug.
			 */
1918
			if (status == MMC_BLK_SUCCESS && ret) {
1919
				pr_err("%s BUG rq_tot %d d_xfer %d\n",
1920 1921 1922 1923 1924
				       __func__, blk_rq_bytes(req),
				       brq->data.bytes_xfered);
				rqc = NULL;
				goto cmd_abort;
			}
1925 1926
			break;
		case MMC_BLK_CMD_ERR:
1927
			ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1928 1929 1930 1931 1932
			if (mmc_blk_reset(md, card->host, type))
				goto cmd_abort;
			if (!ret)
				goto start_new_req;
			break;
1933
		case MMC_BLK_RETRY:
1934
			retune_retry_done = brq->retune_retry_done;
1935
			if (retry++ < 5)
1936
				break;
1937
			/* Fall through */
1938
		case MMC_BLK_ABORT:
1939 1940
			if (!mmc_blk_reset(md, card->host, type))
				break;
1941
			goto cmd_abort;
1942 1943 1944 1945 1946 1947
		case MMC_BLK_DATA_ERR: {
			int err;

			err = mmc_blk_reset(md, card->host, type);
			if (!err)
				break;
1948 1949
			if (err == -ENODEV ||
				mmc_packed_cmd(mq_rq->cmd_type))
1950 1951 1952 1953 1954 1955
				goto cmd_abort;
			/* Fall through */
		}
		case MMC_BLK_ECC_ERR:
			if (brq->data.blocks > 1) {
				/* Redo read one sector at a time */
J
Joe Perches 已提交
1956 1957
				pr_warn("%s: retrying using single block read\n",
					req->rq_disk->disk_name);
1958 1959 1960
				disable_multi = 1;
				break;
			}
1961 1962 1963 1964 1965
			/*
			 * After an error, we redo I/O one sector at a
			 * time, so we only reach here after trying to
			 * read a single sector.
			 */
1966
			ret = blk_end_request(req, -EIO,
1967
						brq->data.blksz);
1968 1969
			if (!ret)
				goto start_new_req;
1970
			break;
1971 1972
		case MMC_BLK_NOMEDIUM:
			goto cmd_abort;
1973 1974 1975 1976
		default:
			pr_err("%s: Unhandled return value (%d)",
					req->rq_disk->disk_name, status);
			goto cmd_abort;
1977 1978
		}

1979
		if (ret) {
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
			if (mmc_packed_cmd(mq_rq->cmd_type)) {
				if (!mq_rq->packed->retries)
					goto cmd_abort;
				mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
				mmc_start_req(card->host,
					      &mq_rq->mmc_active, NULL);
			} else {

				/*
				 * In case of a incomplete request
				 * prepare it again and resend.
				 */
				mmc_blk_rw_rq_prep(mq_rq, card,
						disable_multi, mq);
				mmc_start_req(card->host,
						&mq_rq->mmc_active, NULL);
			}
1997
			mq_rq->brq.retune_retry_done = retune_retry_done;
1998
		}
L
Linus Torvalds 已提交
1999 2000 2001 2002
	} while (ret);

	return 1;

2003
 cmd_abort:
2004 2005 2006 2007 2008 2009 2010 2011 2012
	if (mmc_packed_cmd(mq_rq->cmd_type)) {
		mmc_blk_abort_packed_req(mq_rq);
	} else {
		if (mmc_card_removed(card))
			req->cmd_flags |= REQ_QUIET;
		while (ret)
			ret = blk_end_request(req, -EIO,
					blk_rq_cur_bytes(req));
	}
L
Linus Torvalds 已提交
2013

2014 2015
 start_new_req:
	if (rqc) {
2016 2017 2018 2019
		if (mmc_card_removed(card)) {
			rqc->cmd_flags |= REQ_QUIET;
			blk_end_request_all(rqc, -EIO);
		} else {
2020 2021 2022 2023 2024 2025
			/*
			 * If current request is packed, it needs to put back.
			 */
			if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
				mmc_blk_revert_packed_req(mq, mq->mqrq_cur);

2026 2027 2028 2029
			mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
			mmc_start_req(card->host,
				      &mq->mqrq_cur->mmc_active, NULL);
		}
2030 2031
	}

L
Linus Torvalds 已提交
2032 2033 2034
	return 0;
}

A
Adrian Hunter 已提交
2035 2036
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
{
2037 2038 2039
	int ret;
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
2040 2041
	struct mmc_host *host = card->host;
	unsigned long flags;
2042
	unsigned int cmd_flags = req ? req->cmd_flags : 0;
2043

2044 2045
	if (req && !mq->mqrq_prev->req)
		/* claim host only for the first request */
2046
		mmc_get_card(card);
2047

2048 2049
	ret = mmc_blk_part_switch(card, md);
	if (ret) {
2050
		if (req) {
2051
			blk_end_request_all(req, -EIO);
2052
		}
2053 2054 2055
		ret = 0;
		goto out;
	}
2056

2057
	mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2058
	if (cmd_flags & REQ_DISCARD) {
2059 2060 2061
		/* complete ongoing async transfer before issuing discard */
		if (card->host->areq)
			mmc_blk_issue_rw_rq(mq, NULL);
2062
		if (req->cmd_flags & REQ_SECURE)
2063
			ret = mmc_blk_issue_secdiscard_rq(mq, req);
2064
		else
2065
			ret = mmc_blk_issue_discard_rq(mq, req);
2066
	} else if (cmd_flags & REQ_FLUSH) {
2067 2068 2069
		/* complete ongoing async transfer before issuing flush */
		if (card->host->areq)
			mmc_blk_issue_rw_rq(mq, NULL);
2070
		ret = mmc_blk_issue_flush(mq, req);
2071
	} else {
2072 2073 2074 2075 2076
		if (!req && host->areq) {
			spin_lock_irqsave(&host->context_info.lock, flags);
			host->context_info.is_waiting_last_req = true;
			spin_unlock_irqrestore(&host->context_info.lock, flags);
		}
2077
		ret = mmc_blk_issue_rw_rq(mq, req);
2078
	}
2079

2080
out:
2081
	if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2082
	     (cmd_flags & MMC_REQ_SPECIAL_MASK))
2083 2084 2085 2086 2087 2088
		/*
		 * Release host when there are no more requests
		 * and after special request(discard, flush) is done.
		 * In case sepecial request, there is no reentry to
		 * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
		 */
2089
		mmc_put_card(card);
2090
	return ret;
A
Adrian Hunter 已提交
2091
}
L
Linus Torvalds 已提交
2092

2093 2094 2095 2096 2097 2098
static inline int mmc_blk_readonly(struct mmc_card *card)
{
	return mmc_card_readonly(card) ||
	       !(card->csd.cmdclass & CCC_BLOCK_WRITE);
}

2099 2100 2101 2102
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
					      struct device *parent,
					      sector_t size,
					      bool default_ro,
2103 2104
					      const char *subname,
					      int area_type)
L
Linus Torvalds 已提交
2105 2106 2107 2108
{
	struct mmc_blk_data *md;
	int devidx, ret;

2109 2110
	devidx = find_first_zero_bit(dev_use, max_devices);
	if (devidx >= max_devices)
L
Linus Torvalds 已提交
2111 2112 2113
		return ERR_PTR(-ENOSPC);
	__set_bit(devidx, dev_use);

2114
	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2115 2116 2117 2118
	if (!md) {
		ret = -ENOMEM;
		goto out;
	}
L
Linus Torvalds 已提交
2119

2120 2121
	/*
	 * !subname implies we are creating main mmc_blk_data that will be
2122
	 * associated with mmc_card with dev_set_drvdata. Due to device
2123 2124 2125 2126 2127 2128
	 * partitions, devidx will not coincide with a per-physical card
	 * index anymore so we keep track of a name index.
	 */
	if (!subname) {
		md->name_idx = find_first_zero_bit(name_use, max_devices);
		__set_bit(md->name_idx, name_use);
2129
	} else
2130 2131 2132
		md->name_idx = ((struct mmc_blk_data *)
				dev_to_disk(parent)->private_data)->name_idx;

2133 2134
	md->area_type = area_type;

2135 2136 2137 2138 2139
	/*
	 * Set the read-only status based on the supported commands
	 * and the write protect switch.
	 */
	md->read_only = mmc_blk_readonly(card);
L
Linus Torvalds 已提交
2140

2141
	md->disk = alloc_disk(perdev_minors);
2142 2143 2144 2145
	if (md->disk == NULL) {
		ret = -ENOMEM;
		goto err_kfree;
	}
L
Linus Torvalds 已提交
2146

2147
	spin_lock_init(&md->lock);
2148
	INIT_LIST_HEAD(&md->part);
2149
	md->usage = 1;
L
Linus Torvalds 已提交
2150

2151
	ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2152 2153
	if (ret)
		goto err_putdisk;
L
Linus Torvalds 已提交
2154

2155 2156
	md->queue.issue_fn = mmc_blk_issue_rq;
	md->queue.data = md;
2157

2158
	md->disk->major	= MMC_BLOCK_MAJOR;
2159
	md->disk->first_minor = devidx * perdev_minors;
2160 2161 2162
	md->disk->fops = &mmc_bdops;
	md->disk->private_data = md;
	md->disk->queue = md->queue.queue;
2163 2164
	md->disk->driverfs_dev = parent;
	set_disk_ro(md->disk, md->read_only || default_ro);
2165
	if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2166
		md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179

	/*
	 * 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.
	 */

2180
	snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2181
		 "mmcblk%u%s", md->name_idx, subname ? subname : "");
2182

2183 2184 2185 2186 2187 2188
	if (mmc_card_mmc(card))
		blk_queue_logical_block_size(md->queue.queue,
					     card->ext_csd.data_sector_size);
	else
		blk_queue_logical_block_size(md->queue.queue, 512);

2189
	set_capacity(md->disk, size);
2190

2191 2192 2193 2194 2195 2196
	if (mmc_host_cmd23(card->host)) {
		if (mmc_card_mmc(card) ||
		    (mmc_card_sd(card) &&
		     card->scr.cmds & SD_SCR_CMD23_SUPPORT))
			md->flags |= MMC_BLK_CMD23;
	}
2197 2198 2199 2200 2201 2202 2203 2204 2205

	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_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
	}

2206 2207 2208 2209 2210 2211 2212 2213
	if (mmc_card_mmc(card) &&
	    (area_type == MMC_BLK_DATA_AREA_MAIN) &&
	    (md->flags & MMC_BLK_CMD23) &&
	    card->ext_csd.packed_event_en) {
		if (!mmc_packed_init(&md->queue, card))
			md->flags |= MMC_BLK_PACKED_CMD;
	}

2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226
	return md;

 err_putdisk:
	put_disk(md->disk);
 err_kfree:
	kfree(md);
 out:
	return ERR_PTR(ret);
}

static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
{
	sector_t size;
2227

P
Pierre Ossman 已提交
2228 2229 2230 2231 2232
	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
		/*
		 * The EXT_CSD sector count is in number or 512 byte
		 * sectors.
		 */
2233
		size = card->ext_csd.sectors;
P
Pierre Ossman 已提交
2234 2235 2236 2237 2238
	} else {
		/*
		 * The CSD capacity field is in units of read_blkbits.
		 * set_capacity takes units of 512 bytes.
		 */
2239 2240
		size = (typeof(sector_t))card->csd.capacity
			<< (card->csd.read_blkbits - 9);
P
Pierre Ossman 已提交
2241
	}
2242

2243
	return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2244
					MMC_BLK_DATA_AREA_MAIN);
2245
}
2246

2247 2248 2249 2250 2251
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,
2252 2253
			      const char *subname,
			      int area_type)
2254 2255 2256 2257 2258
{
	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,
2259
				    subname, area_type);
2260 2261 2262 2263 2264
	if (IS_ERR(part_md))
		return PTR_ERR(part_md);
	part_md->part_type = part_type;
	list_add(&part_md->part, &md->part);

2265
	string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2266
			cap_str, sizeof(cap_str));
2267
	pr_info("%s: %s %s partition %u %s\n",
2268 2269 2270 2271 2272
	       part_md->disk->disk_name, mmc_card_id(card),
	       mmc_card_name(card), part_md->part_type, cap_str);
	return 0;
}

2273 2274 2275 2276 2277 2278
/* 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.
 */

2279 2280
static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
{
2281
	int idx, ret = 0;
2282 2283 2284 2285

	if (!mmc_card_mmc(card))
		return 0;

2286 2287 2288 2289 2290 2291
	for (idx = 0; idx < card->nr_parts; idx++) {
		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,
2292 2293
				card->part[idx].name,
				card->part[idx].area_type);
2294 2295 2296
			if (ret)
				return ret;
		}
2297 2298 2299
	}

	return ret;
L
Linus Torvalds 已提交
2300 2301
}

2302 2303
static void mmc_blk_remove_req(struct mmc_blk_data *md)
{
2304 2305
	struct mmc_card *card;

2306
	if (md) {
2307 2308 2309 2310 2311
		/*
		 * Flush remaining requests and free queues. It
		 * is freeing the queue that stops new requests
		 * from being accepted.
		 */
2312
		card = md->queue.card;
2313 2314 2315
		mmc_cleanup_queue(&md->queue);
		if (md->flags & MMC_BLK_PACKED_CMD)
			mmc_packed_clean(&md->queue);
2316 2317
		if (md->disk->flags & GENHD_FL_UP) {
			device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2318 2319 2320 2321
			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);
2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334

			del_gendisk(md->disk);
		}
		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;

2335
	__clear_bit(md->name_idx, name_use);
2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
	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;
2346
	struct mmc_card *card = md->queue.card;
2347 2348 2349 2350

	add_disk(md->disk);
	md->force_ro.show = force_ro_show;
	md->force_ro.store = force_ro_store;
2351
	sysfs_attr_init(&md->force_ro.attr);
2352 2353 2354 2355
	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)
2356 2357 2358 2359
		goto force_ro_fail;

	if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
	     card->ext_csd.boot_ro_lockable) {
A
Al Viro 已提交
2360
		umode_t mode;
2361 2362 2363 2364 2365 2366 2367 2368

		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;
2369
		sysfs_attr_init(&md->power_ro_lock.attr);
2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
		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);
2384 2385 2386 2387

	return ret;
}

2388 2389 2390
#define CID_MANFID_SANDISK	0x2
#define CID_MANFID_TOSHIBA	0x11
#define CID_MANFID_MICRON	0x13
2391
#define CID_MANFID_SAMSUNG	0x15
2392

2393 2394
static const struct mmc_fixup blk_fixups[] =
{
2395 2396 2397 2398 2399 2400 2401 2402 2403 2404
	MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
		  MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
		  MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
		  MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
		  MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
		  MMC_QUIRK_INAND_CMD38),
2405 2406 2407 2408 2409 2410 2411 2412 2413

	/*
	 * Some MMC cards experience performance degradation with CMD23
	 * instead of CMD12-bounded multiblock transfers. For now we'll
	 * black list what's bad...
	 * - Certain Toshiba cards.
	 *
	 * N.B. This doesn't affect SD cards.
	 */
2414
	MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2415
		  MMC_QUIRK_BLK_NO_CMD23),
2416
	MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2417
		  MMC_QUIRK_BLK_NO_CMD23),
2418
	MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2419
		  MMC_QUIRK_BLK_NO_CMD23),
2420 2421 2422 2423 2424

	/*
	 * Some Micron MMC cards needs longer data read timeout than
	 * indicated in CSD.
	 */
2425
	MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2426 2427
		  MMC_QUIRK_LONG_READ_TIME),

2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449
	/*
	 * On these Samsung MoviNAND parts, performing secure erase or
	 * secure trim can result in unrecoverable corruption due to a
	 * firmware bug.
	 */
	MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
	MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
		  MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),

2450 2451 2452
	END_FIXUP
};

2453
static int mmc_blk_probe(struct mmc_card *card)
L
Linus Torvalds 已提交
2454
{
2455
	struct mmc_blk_data *md, *part_md;
2456 2457
	char cap_str[10];

2458 2459 2460 2461
	/*
	 * Check that the card supports the command class(es) we need.
	 */
	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
L
Linus Torvalds 已提交
2462 2463
		return -ENODEV;

2464 2465
	mmc_fixup_device(card, blk_fixups);

L
Linus Torvalds 已提交
2466 2467 2468 2469
	md = mmc_blk_alloc(card);
	if (IS_ERR(md))
		return PTR_ERR(md);

2470
	string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2471
			cap_str, sizeof(cap_str));
2472
	pr_info("%s: %s %s %s %s\n",
L
Linus Torvalds 已提交
2473
		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2474
		cap_str, md->read_only ? "(ro)" : "");
L
Linus Torvalds 已提交
2475

2476 2477 2478
	if (mmc_blk_alloc_parts(card, md))
		goto out;

2479
	dev_set_drvdata(&card->dev, md);
2480

2481 2482 2483 2484 2485 2486 2487
	if (mmc_add_disk(md))
		goto out;

	list_for_each_entry(part_md, &md->part, part) {
		if (mmc_add_disk(part_md))
			goto out;
	}
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500

	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 (card->type != MMC_TYPE_SD_COMBO) {
		pm_runtime_set_active(&card->dev);
		pm_runtime_enable(&card->dev);
	}

L
Linus Torvalds 已提交
2501 2502 2503
	return 0;

 out:
2504 2505
	mmc_blk_remove_parts(card, md);
	mmc_blk_remove_req(md);
2506
	return 0;
L
Linus Torvalds 已提交
2507 2508
}

2509
static void mmc_blk_remove(struct mmc_card *card)
L
Linus Torvalds 已提交
2510
{
2511
	struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
L
Linus Torvalds 已提交
2512

2513
	mmc_blk_remove_parts(card, md);
2514
	pm_runtime_get_sync(&card->dev);
2515 2516 2517
	mmc_claim_host(card->host);
	mmc_blk_part_switch(card, md);
	mmc_release_host(card->host);
2518 2519 2520
	if (card->type != MMC_TYPE_SD_COMBO)
		pm_runtime_disable(&card->dev);
	pm_runtime_put_noidle(&card->dev);
2521
	mmc_blk_remove_req(md);
2522
	dev_set_drvdata(&card->dev, NULL);
L
Linus Torvalds 已提交
2523 2524
}

2525
static int _mmc_blk_suspend(struct mmc_card *card)
L
Linus Torvalds 已提交
2526
{
2527
	struct mmc_blk_data *part_md;
2528
	struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
L
Linus Torvalds 已提交
2529 2530 2531

	if (md) {
		mmc_queue_suspend(&md->queue);
2532 2533 2534
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_suspend(&part_md->queue);
		}
L
Linus Torvalds 已提交
2535 2536 2537 2538
	}
	return 0;
}

2539
static void mmc_blk_shutdown(struct mmc_card *card)
2540
{
2541
	_mmc_blk_suspend(card);
2542 2543
}

2544 2545
#ifdef CONFIG_PM_SLEEP
static int mmc_blk_suspend(struct device *dev)
2546
{
2547 2548 2549
	struct mmc_card *card = mmc_dev_to_card(dev);

	return _mmc_blk_suspend(card);
2550 2551
}

2552
static int mmc_blk_resume(struct device *dev)
L
Linus Torvalds 已提交
2553
{
2554
	struct mmc_blk_data *part_md;
2555
	struct mmc_blk_data *md = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
2556 2557

	if (md) {
2558 2559 2560 2561 2562
		/*
		 * Resume involves the card going into idle state,
		 * so current partition is always the main one.
		 */
		md->part_curr = md->part_type;
L
Linus Torvalds 已提交
2563
		mmc_queue_resume(&md->queue);
2564 2565 2566
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_resume(&part_md->queue);
		}
L
Linus Torvalds 已提交
2567 2568 2569 2570 2571
	}
	return 0;
}
#endif

2572 2573
static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);

2574 2575 2576 2577 2578
static struct mmc_driver mmc_driver = {
	.drv		= {
		.name	= "mmcblk",
		.pm	= &mmc_blk_pm_ops,
	},
L
Linus Torvalds 已提交
2579 2580
	.probe		= mmc_blk_probe,
	.remove		= mmc_blk_remove,
2581
	.shutdown	= mmc_blk_shutdown,
L
Linus Torvalds 已提交
2582 2583 2584 2585
};

static int __init mmc_blk_init(void)
{
2586
	int res;
L
Linus Torvalds 已提交
2587

2588 2589 2590
	if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
		pr_info("mmcblk: using %d minors per device\n", perdev_minors);

B
Ben Hutchings 已提交
2591
	max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2592

2593 2594
	res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
	if (res)
L
Linus Torvalds 已提交
2595 2596
		goto out;

2597 2598 2599
	res = mmc_register_driver(&mmc_driver);
	if (res)
		goto out2;
L
Linus Torvalds 已提交
2600

2601 2602 2603
	return 0;
 out2:
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
L
Linus Torvalds 已提交
2604 2605 2606 2607 2608 2609 2610
 out:
	return res;
}

static void __exit mmc_blk_exit(void)
{
	mmc_unregister_driver(&mmc_driver);
2611
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
L
Linus Torvalds 已提交
2612 2613 2614 2615 2616 2617 2618 2619
}

module_init(mmc_blk_init);
module_exit(mmc_blk_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");