block.c 64.4 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 MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "mmcblk."

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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);

	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

633
static const struct block_device_operations mmc_bdops = {
A
Al Viro 已提交
634 635
	.open			= mmc_blk_open,
	.release		= mmc_blk_release,
636
	.getgeo			= mmc_blk_getgeo,
L
Linus Torvalds 已提交
637
	.owner			= THIS_MODULE,
638 639 640 641
	.ioctl			= mmc_blk_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl		= mmc_blk_compat_ioctl,
#endif
L
Linus Torvalds 已提交
642 643
};

644 645 646 647
static inline int mmc_blk_part_switch(struct mmc_card *card,
				      struct mmc_blk_data *md)
{
	int ret;
648
	struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
649

650 651 652 653
	if (main_md->part_curr == md->part_type)
		return 0;

	if (mmc_card_mmc(card)) {
654 655 656 657
		u8 part_config = card->ext_csd.part_config;

		part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
		part_config |= md->part_type;
658 659

		ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
660
				 EXT_CSD_PART_CONFIG, part_config,
661 662 663
				 card->ext_csd.part_time);
		if (ret)
			return ret;
664 665

		card->ext_csd.part_config = part_config;
666
	}
667 668 669 670 671

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

672 673 674
static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
{
	int err;
B
Ben Dooks 已提交
675 676
	u32 result;
	__be32 *blocks;
677

678
	struct mmc_request mrq = {NULL};
679
	struct mmc_command cmd = {0};
680
	struct mmc_data data = {0};
681 682 683 684 685

	struct scatterlist sg;

	cmd.opcode = MMC_APP_CMD;
	cmd.arg = card->rca << 16;
D
David Brownell 已提交
686
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
687 688

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
D
David Brownell 已提交
689 690 691
	if (err)
		return (u32)-1;
	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
692 693 694 695 696 697
		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
698
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
699 700 701 702 703 704

	data.blksz = 4;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;
705
	mmc_set_data_timeout(&data, card);
706 707 708 709

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

B
Ben Dooks 已提交
710 711 712 713 714
	blocks = kmalloc(4, GFP_KERNEL);
	if (!blocks)
		return (u32)-1;

	sg_init_one(&sg, blocks, 4);
715 716 717

	mmc_wait_for_req(card->host, &mrq);

B
Ben Dooks 已提交
718 719 720
	result = ntohl(*blocks);
	kfree(blocks);

P
Pierre Ossman 已提交
721
	if (cmd.error || data.error)
B
Ben Dooks 已提交
722
		result = (u32)-1;
723

B
Ben Dooks 已提交
724
	return result;
725 726
}

727
static int get_card_status(struct mmc_card *card, u32 *status, int retries)
728
{
729
	struct mmc_command cmd = {0};
730 731 732 733 734 735
	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;
736 737 738 739
	err = mmc_wait_for_cmd(card->host, &cmd, retries);
	if (err == 0)
		*status = cmd.resp[0];
	return err;
740 741
}

742
static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
743
		bool hw_busy_detect, struct request *req, int *gen_err)
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
{
	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;
		}

763 764 765 766 767
		/* We may rely on the host hw to handle busy detection.*/
		if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
			hw_busy_detect)
			break;

768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789
		/*
		 * 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;
}

790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
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);
}

835
#define ERR_NOMEDIUM	3
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
#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,
897
	struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
898 899 900 901 902
{
	bool prev_cmd_status_valid = true;
	u32 status, stop_status = 0;
	int err, retry;

903 904 905
	if (mmc_card_removed(card))
		return ERR_NOMEDIUM;

906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
	/*
	 * 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;

		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. */
922 923 924 925
	if (err) {
		/* Check if the card is removed */
		if (mmc_detect_card_removed(card->host))
			return ERR_NOMEDIUM;
926
		return ERR_ABORT;
927
	}
928

929 930 931 932 933 934
	/* 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;

935 936 937 938 939 940 941 942 943 944
	/* 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;
		}

945 946 947 948 949 950
	/*
	 * 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) {
951 952 953 954
		err = send_stop(card,
			DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
			req, gen_err, &stop_status);
		if (err) {
955 956
			pr_err("%s: error %d sending stop command\n",
			       req->rq_disk->disk_name, err);
957 958 959 960
			/*
			 * If the stop cmd also timed out, the card is probably
			 * not present, so abort. Other errors are bad news too.
			 */
961
			return ERR_ABORT;
962 963
		}

964 965
		if (stop_status & R1_CARD_ECC_FAILED)
			*ecc_err = 1;
966 967 968 969 970 971 972 973 974 975 976 977
	}

	/* 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);

978 979 980 981
	/* Data errors */
	if (!brq->stop.error)
		return ERR_CONTINUE;

982
	/* Now for stop errors.  These aren't fatal to the transfer. */
983
	pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
984 985 986 987 988 989 990 991 992 993 994 995 996 997
	       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;
}

998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
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) {
1010 1011
		struct mmc_blk_data *main_md =
			dev_get_drvdata(&host->card->dev);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
		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;
}

A
Adrian Hunter 已提交
1032 1033 1034 1035 1036
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;
1037
	int err = 0, type = MMC_BLK_DISCARD;
A
Adrian Hunter 已提交
1038 1039 1040 1041 1042 1043 1044 1045 1046

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

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

1047 1048 1049
	if (mmc_can_discard(card))
		arg = MMC_DISCARD_ARG;
	else if (mmc_can_trim(card))
A
Adrian Hunter 已提交
1050 1051 1052
		arg = MMC_TRIM_ARG;
	else
		arg = MMC_ERASE_ARG;
1053
retry:
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	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
1064 1065
	err = mmc_erase(card, from, nr, arg);
out:
1066 1067 1068 1069
	if (err == -EIO && !mmc_blk_reset(md, card->host, type))
		goto retry;
	if (!err)
		mmc_blk_reset_success(md, type);
1070
	blk_end_request(req, err, blk_rq_bytes(req));
A
Adrian Hunter 已提交
1071 1072 1073 1074

	return err ? 0 : 1;
}

1075 1076 1077 1078 1079
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;
1080
	unsigned int from, nr, arg;
1081
	int err = 0, type = MMC_BLK_SECDISCARD;
1082

1083
	if (!(mmc_can_secure_erase_trim(card))) {
1084 1085 1086 1087
		err = -EOPNOTSUPP;
		goto out;
	}

1088 1089 1090
	from = blk_rq_pos(req);
	nr = blk_rq_sectors(req);

1091 1092 1093 1094
	if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
		arg = MMC_SECURE_TRIM1_ARG;
	else
		arg = MMC_SECURE_ERASE_ARG;
1095

1096
retry:
1097 1098 1099 1100 1101 1102 1103 1104
	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)
1105
			goto out_retry;
1106
	}
1107

1108
	err = mmc_erase(card, from, nr, arg);
1109 1110 1111 1112 1113 1114
	if (err == -EIO)
		goto out_retry;
	if (err)
		goto out;

	if (arg == MMC_SECURE_TRIM1_ARG) {
1115 1116 1117 1118 1119 1120
		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)
1121
				goto out_retry;
1122
		}
1123

1124
		err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1125 1126 1127 1128
		if (err == -EIO)
			goto out_retry;
		if (err)
			goto out;
1129
	}
1130 1131 1132

out_retry:
	if (err && !mmc_blk_reset(md, card->host, type))
1133 1134 1135
		goto retry;
	if (!err)
		mmc_blk_reset_success(md, type);
1136
out:
1137
	blk_end_request(req, err, blk_rq_bytes(req));
1138 1139 1140 1141

	return err ? 0 : 1;
}

A
Andrei Warkentin 已提交
1142 1143 1144
static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
1145 1146 1147 1148 1149 1150
	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
1151

1152
	blk_end_request_all(req, ret);
A
Andrei Warkentin 已提交
1153

1154
	return ret ? 0 : 1;
A
Andrei Warkentin 已提交
1155 1156 1157 1158 1159 1160 1161 1162 1163
}

/*
 * 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.
 */
1164 1165 1166
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
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
{
	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;
	}
}

1180 1181 1182 1183 1184 1185 1186 1187
#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 */

1188 1189
static int mmc_blk_err_check(struct mmc_card *card,
			     struct mmc_async_req *areq)
1190
{
1191 1192 1193 1194
	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;
1195
	int ecc_err = 0, gen_err = 0;
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206

	/*
	 * 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.
	 */
1207 1208
	if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
	    brq->data.error) {
1209
		switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1210 1211 1212 1213
		case ERR_RETRY:
			return MMC_BLK_RETRY;
		case ERR_ABORT:
			return MMC_BLK_ABORT;
1214 1215
		case ERR_NOMEDIUM:
			return MMC_BLK_NOMEDIUM;
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
		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) {
1238
		int err;
1239

1240 1241 1242 1243 1244 1245 1246 1247
		/* 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;
		}

1248 1249
		err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
					&gen_err);
1250 1251
		if (err)
			return MMC_BLK_CMD_ERR;
1252 1253
	}

1254 1255 1256 1257 1258 1259 1260
	/* 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;
	}

1261 1262 1263 1264 1265 1266 1267 1268
	if (brq->data.error) {
		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) {
1269 1270
			if (ecc_err)
				return MMC_BLK_ECC_ERR;
1271 1272 1273 1274 1275 1276
			return MMC_BLK_DATA_ERR;
		} else {
			return MMC_BLK_CMD_ERR;
		}
	}

1277 1278
	if (!brq->data.bytes_xfered)
		return MMC_BLK_RETRY;
1279

1280 1281 1282 1283 1284 1285 1286
	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;
	}

1287 1288 1289 1290
	if (blk_rq_bytes(req) != brq->data.bytes_xfered)
		return MMC_BLK_PARTIAL;

	return MMC_BLK_SUCCESS;
1291 1292
}

1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
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) {
1315
		err = mmc_get_ext_csd(card, &ext_csd);
1316 1317 1318
		if (err) {
			pr_err("%s: error %d sending ext_csd\n",
			       req->rq_disk->disk_name, err);
1319
			return MMC_BLK_ABORT;
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
		}

		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;
}

1343 1344 1345 1346
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
			       struct mmc_card *card,
			       int disable_multi,
			       struct mmc_queue *mq)
L
Linus Torvalds 已提交
1347
{
1348 1349 1350
	u32 readcmd, writecmd;
	struct mmc_blk_request *brq = &mqrq->brq;
	struct request *req = mqrq->req;
L
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1351
	struct mmc_blk_data *md = mq->data;
S
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	bool do_data_tag;
L
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1353

A
Andrei Warkentin 已提交
1354 1355 1356
	/*
	 * Reliable writes are used to implement Forced Unit Access and
	 * REQ_META accesses, and are supported only on MMCs.
1357 1358 1359
	 *
	 * XXX: this really needs a good explanation of why REQ_META
	 * is treated special.
A
Andrei Warkentin 已提交
1360 1361 1362 1363
	 */
	bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
			  (req->cmd_flags & REQ_META)) &&
		(rq_data_dir(req) == WRITE) &&
1364
		(md->flags & MMC_BLK_REL_WR);
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Andrei Warkentin 已提交
1365

1366 1367 1368
	memset(brq, 0, sizeof(struct mmc_blk_request));
	brq->mrq.cmd = &brq->cmd;
	brq->mrq.data = &brq->data;
L
Linus Torvalds 已提交
1369

1370 1371 1372 1373 1374 1375 1376 1377
	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);
1378

1379 1380 1381 1382 1383 1384 1385
	/*
	 * 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;
L
Linus Torvalds 已提交
1386

1387 1388 1389 1390 1391 1392 1393 1394 1395
	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;

1396 1397 1398 1399 1400 1401 1402 1403 1404
		/*
		 * 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);
1405
	}
1406

1407 1408 1409
	if (brq->data.blocks > 1 || do_rel_wr) {
		/* SPI multiblock writes terminate using a special
		 * token, not a STOP_TRANSMISSION request.
1410
		 */
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
		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;
1424 1425 1426
		if (brq->mrq.stop)
			brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
					MMC_CMD_AC;
1427 1428 1429
	} else {
		brq->cmd.opcode = writecmd;
		brq->data.flags |= MMC_DATA_WRITE;
1430 1431 1432
		if (brq->mrq.stop)
			brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
					MMC_CMD_AC;
1433
	}
1434

1435 1436
	if (do_rel_wr)
		mmc_apply_rel_rw(brq, card, req);
A
Andrei Warkentin 已提交
1437

S
Saugata Das 已提交
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	/*
	 * 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);

1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
	/*
	 * 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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1466 1467 1468
	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)) {
1469 1470
		brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
		brq->sbc.arg = brq->data.blocks |
S
Saugata Das 已提交
1471 1472
			(do_rel_wr ? (1 << 31) : 0) |
			(do_data_tag ? (1 << 29) : 0);
1473 1474 1475
		brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
		brq->mrq.sbc = &brq->sbc;
	}
1476

1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	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;
1496 1497
			}
		}
1498 1499 1500
		brq->data.sg_len = i;
	}

1501 1502 1503
	mqrq->mmc_active.mrq = &brq->mrq;
	mqrq->mmc_active.err_check = mmc_blk_err_check;

1504 1505
	mmc_queue_bounce_pre(mqrq);
}
1506

1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 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
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);
}

1715 1716 1717 1718
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)
{
1719 1720 1721
	struct mmc_queue_req *mq_rq;
	mq_rq = container_of(brq, struct mmc_queue_req, brq);

1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
	/*
	 * 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) {
1735
			ret = blk_end_request(req, 0, blocks << 9);
1736 1737
		}
	} else {
1738 1739
		if (!mmc_packed_cmd(mq_rq->cmd_type))
			ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1740 1741 1742 1743
	}
	return ret;
}

1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 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
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);
}

1816
static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1817 1818 1819 1820
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
	struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1821
	int ret = 1, disable_multi = 0, retry = 0, type;
1822
	enum mmc_blk_status status;
1823
	struct mmc_queue_req *mq_rq;
1824
	struct request *req = rqc;
1825
	struct mmc_async_req *areq;
1826 1827
	const u8 packed_nr = 2;
	u8 reqs = 0;
L
Linus Torvalds 已提交
1828

1829 1830
	if (!rqc && !mq->mqrq_prev->req)
		return 0;
1831

1832 1833 1834
	if (rqc)
		reqs = mmc_blk_prep_packed_list(mq, rqc);

1835 1836
	do {
		if (rqc) {
1837 1838 1839 1840 1841 1842 1843 1844
			/*
			 * 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);
1845
				mq_rq = mq->mqrq_cur;
1846 1847
				goto cmd_abort;
			}
1848 1849 1850 1851 1852 1853

			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);
1854 1855 1856 1857
			areq = &mq->mqrq_cur->mmc_active;
		} else
			areq = NULL;
		areq = mmc_start_req(card->host, areq, (int *) &status);
1858 1859 1860
		if (!areq) {
			if (status == MMC_BLK_NEW_REQUEST)
				mq->flags |= MMC_QUEUE_NEW_REQUEST;
1861
			return 0;
1862
		}
1863 1864 1865 1866

		mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
		brq = &mq_rq->brq;
		req = mq_rq->req;
1867
		type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1868
		mmc_queue_bounce_post(mq_rq);
1869

1870 1871 1872 1873 1874 1875
		switch (status) {
		case MMC_BLK_SUCCESS:
		case MMC_BLK_PARTIAL:
			/*
			 * A block was successfully transferred.
			 */
1876
			mmc_blk_reset_success(md, type);
1877 1878 1879 1880 1881 1882

			if (mmc_packed_cmd(mq_rq->cmd_type)) {
				ret = mmc_blk_end_packed_req(mq_rq);
				break;
			} else {
				ret = blk_end_request(req, 0,
1883
						brq->data.bytes_xfered);
1884 1885
			}

1886 1887 1888 1889 1890
			/*
			 * 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.
			 */
1891
			if (status == MMC_BLK_SUCCESS && ret) {
1892
				pr_err("%s BUG rq_tot %d d_xfer %d\n",
1893 1894 1895 1896 1897
				       __func__, blk_rq_bytes(req),
				       brq->data.bytes_xfered);
				rqc = NULL;
				goto cmd_abort;
			}
1898 1899
			break;
		case MMC_BLK_CMD_ERR:
1900 1901 1902 1903
			ret = mmc_blk_cmd_err(md, card, brq, req, ret);
			if (!mmc_blk_reset(md, card->host, type))
				break;
			goto cmd_abort;
1904 1905
		case MMC_BLK_RETRY:
			if (retry++ < 5)
1906
				break;
1907
			/* Fall through */
1908
		case MMC_BLK_ABORT:
1909 1910
			if (!mmc_blk_reset(md, card->host, type))
				break;
1911
			goto cmd_abort;
1912 1913 1914 1915 1916 1917
		case MMC_BLK_DATA_ERR: {
			int err;

			err = mmc_blk_reset(md, card->host, type);
			if (!err)
				break;
1918 1919
			if (err == -ENODEV ||
				mmc_packed_cmd(mq_rq->cmd_type))
1920 1921 1922 1923 1924 1925
				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
1926 1927
				pr_warn("%s: retrying using single block read\n",
					req->rq_disk->disk_name);
1928 1929 1930
				disable_multi = 1;
				break;
			}
1931 1932 1933 1934 1935
			/*
			 * After an error, we redo I/O one sector at a
			 * time, so we only reach here after trying to
			 * read a single sector.
			 */
1936
			ret = blk_end_request(req, -EIO,
1937
						brq->data.blksz);
1938 1939
			if (!ret)
				goto start_new_req;
1940
			break;
1941 1942
		case MMC_BLK_NOMEDIUM:
			goto cmd_abort;
1943 1944 1945 1946
		default:
			pr_err("%s: Unhandled return value (%d)",
					req->rq_disk->disk_name, status);
			goto cmd_abort;
1947 1948
		}

1949
		if (ret) {
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966
			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);
			}
1967
		}
L
Linus Torvalds 已提交
1968 1969 1970 1971
	} while (ret);

	return 1;

1972
 cmd_abort:
1973 1974 1975 1976 1977 1978 1979 1980 1981
	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
1982

1983 1984
 start_new_req:
	if (rqc) {
1985 1986 1987 1988
		if (mmc_card_removed(card)) {
			rqc->cmd_flags |= REQ_QUIET;
			blk_end_request_all(rqc, -EIO);
		} else {
1989 1990 1991 1992 1993 1994
			/*
			 * 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);

1995 1996 1997 1998
			mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
			mmc_start_req(card->host,
				      &mq->mqrq_cur->mmc_active, NULL);
		}
1999 2000
	}

L
Linus Torvalds 已提交
2001 2002 2003
	return 0;
}

A
Adrian Hunter 已提交
2004 2005
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
{
2006 2007 2008
	int ret;
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
2009 2010
	struct mmc_host *host = card->host;
	unsigned long flags;
2011
	unsigned int cmd_flags = req ? req->cmd_flags : 0;
2012

2013 2014
	if (req && !mq->mqrq_prev->req)
		/* claim host only for the first request */
2015
		mmc_get_card(card);
2016

2017 2018
	ret = mmc_blk_part_switch(card, md);
	if (ret) {
2019
		if (req) {
2020
			blk_end_request_all(req, -EIO);
2021
		}
2022 2023 2024
		ret = 0;
		goto out;
	}
2025

2026
	mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2027
	if (cmd_flags & REQ_DISCARD) {
2028 2029 2030
		/* complete ongoing async transfer before issuing discard */
		if (card->host->areq)
			mmc_blk_issue_rw_rq(mq, NULL);
2031
		if (req->cmd_flags & REQ_SECURE)
2032
			ret = mmc_blk_issue_secdiscard_rq(mq, req);
2033
		else
2034
			ret = mmc_blk_issue_discard_rq(mq, req);
2035
	} else if (cmd_flags & REQ_FLUSH) {
2036 2037 2038
		/* complete ongoing async transfer before issuing flush */
		if (card->host->areq)
			mmc_blk_issue_rw_rq(mq, NULL);
2039
		ret = mmc_blk_issue_flush(mq, req);
2040
	} else {
2041 2042 2043 2044 2045
		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);
		}
2046
		ret = mmc_blk_issue_rw_rq(mq, req);
2047
	}
2048

2049
out:
2050
	if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2051
	     (cmd_flags & MMC_REQ_SPECIAL_MASK))
2052 2053 2054 2055 2056 2057
		/*
		 * 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'.
		 */
2058
		mmc_put_card(card);
2059
	return ret;
A
Adrian Hunter 已提交
2060
}
L
Linus Torvalds 已提交
2061

2062 2063 2064 2065 2066 2067
static inline int mmc_blk_readonly(struct mmc_card *card)
{
	return mmc_card_readonly(card) ||
	       !(card->csd.cmdclass & CCC_BLOCK_WRITE);
}

2068 2069 2070 2071
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
					      struct device *parent,
					      sector_t size,
					      bool default_ro,
2072 2073
					      const char *subname,
					      int area_type)
L
Linus Torvalds 已提交
2074 2075 2076 2077
{
	struct mmc_blk_data *md;
	int devidx, ret;

2078 2079
	devidx = find_first_zero_bit(dev_use, max_devices);
	if (devidx >= max_devices)
L
Linus Torvalds 已提交
2080 2081 2082
		return ERR_PTR(-ENOSPC);
	__set_bit(devidx, dev_use);

2083
	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2084 2085 2086 2087
	if (!md) {
		ret = -ENOMEM;
		goto out;
	}
L
Linus Torvalds 已提交
2088

2089 2090
	/*
	 * !subname implies we are creating main mmc_blk_data that will be
2091
	 * associated with mmc_card with dev_set_drvdata. Due to device
2092 2093 2094 2095 2096 2097
	 * 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);
2098
	} else
2099 2100 2101
		md->name_idx = ((struct mmc_blk_data *)
				dev_to_disk(parent)->private_data)->name_idx;

2102 2103
	md->area_type = area_type;

2104 2105 2106 2107 2108
	/*
	 * 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
2109

2110
	md->disk = alloc_disk(perdev_minors);
2111 2112 2113 2114
	if (md->disk == NULL) {
		ret = -ENOMEM;
		goto err_kfree;
	}
L
Linus Torvalds 已提交
2115

2116
	spin_lock_init(&md->lock);
2117
	INIT_LIST_HEAD(&md->part);
2118
	md->usage = 1;
L
Linus Torvalds 已提交
2119

2120
	ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2121 2122
	if (ret)
		goto err_putdisk;
L
Linus Torvalds 已提交
2123

2124 2125
	md->queue.issue_fn = mmc_blk_issue_rq;
	md->queue.data = md;
2126

2127
	md->disk->major	= MMC_BLOCK_MAJOR;
2128
	md->disk->first_minor = devidx * perdev_minors;
2129 2130 2131
	md->disk->fops = &mmc_bdops;
	md->disk->private_data = md;
	md->disk->queue = md->queue.queue;
2132 2133
	md->disk->driverfs_dev = parent;
	set_disk_ro(md->disk, md->read_only || default_ro);
2134
	if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2135
		md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148

	/*
	 * 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.
	 */

2149 2150
	snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
		 "mmcblk%d%s", md->name_idx, subname ? subname : "");
2151

2152 2153 2154 2155 2156 2157
	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);

2158
	set_capacity(md->disk, size);
2159

2160 2161 2162 2163 2164 2165
	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;
	}
2166 2167 2168 2169 2170 2171 2172 2173 2174

	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);
	}

2175 2176 2177 2178 2179 2180 2181 2182
	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;
	}

2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
	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;
	struct mmc_blk_data *md;
2197

P
Pierre Ossman 已提交
2198 2199 2200 2201 2202
	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
		/*
		 * The EXT_CSD sector count is in number or 512 byte
		 * sectors.
		 */
2203
		size = card->ext_csd.sectors;
P
Pierre Ossman 已提交
2204 2205 2206 2207 2208
	} else {
		/*
		 * The CSD capacity field is in units of read_blkbits.
		 * set_capacity takes units of 512 bytes.
		 */
2209
		size = card->csd.capacity << (card->csd.read_blkbits - 9);
P
Pierre Ossman 已提交
2210
	}
2211

2212 2213
	md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
					MMC_BLK_DATA_AREA_MAIN);
L
Linus Torvalds 已提交
2214
	return md;
2215
}
2216

2217 2218 2219 2220 2221
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,
2222 2223
			      const char *subname,
			      int area_type)
2224 2225 2226 2227 2228
{
	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,
2229
				    subname, area_type);
2230 2231 2232 2233 2234 2235 2236
	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) << 9, STRING_UNITS_2,
			cap_str, sizeof(cap_str));
2237
	pr_info("%s: %s %s partition %u %s\n",
2238 2239 2240 2241 2242
	       part_md->disk->disk_name, mmc_card_id(card),
	       mmc_card_name(card), part_md->part_type, cap_str);
	return 0;
}

2243 2244 2245 2246 2247 2248
/* 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.
 */

2249 2250
static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
{
2251
	int idx, ret = 0;
2252 2253 2254 2255

	if (!mmc_card_mmc(card))
		return 0;

2256 2257 2258 2259 2260 2261
	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,
2262 2263
				card->part[idx].name,
				card->part[idx].area_type);
2264 2265 2266
			if (ret)
				return ret;
		}
2267 2268 2269
	}

	return ret;
L
Linus Torvalds 已提交
2270 2271
}

2272 2273
static void mmc_blk_remove_req(struct mmc_blk_data *md)
{
2274 2275
	struct mmc_card *card;

2276
	if (md) {
2277 2278 2279 2280 2281
		/*
		 * Flush remaining requests and free queues. It
		 * is freeing the queue that stops new requests
		 * from being accepted.
		 */
2282
		card = md->queue.card;
2283 2284 2285
		mmc_cleanup_queue(&md->queue);
		if (md->flags & MMC_BLK_PACKED_CMD)
			mmc_packed_clean(&md->queue);
2286 2287
		if (md->disk->flags & GENHD_FL_UP) {
			device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2288 2289 2290 2291
			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);
2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304

			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;

2305
	__clear_bit(md->name_idx, name_use);
2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
	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;
2316
	struct mmc_card *card = md->queue.card;
2317 2318 2319 2320

	add_disk(md->disk);
	md->force_ro.show = force_ro_show;
	md->force_ro.store = force_ro_store;
2321
	sysfs_attr_init(&md->force_ro.attr);
2322 2323 2324 2325
	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)
2326 2327 2328 2329
		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
2330
		umode_t mode;
2331 2332 2333 2334 2335 2336 2337 2338

		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;
2339
		sysfs_attr_init(&md->power_ro_lock.attr);
2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
		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);
2354 2355 2356 2357

	return ret;
}

2358 2359 2360
#define CID_MANFID_SANDISK	0x2
#define CID_MANFID_TOSHIBA	0x11
#define CID_MANFID_MICRON	0x13
2361
#define CID_MANFID_SAMSUNG	0x15
2362

2363 2364
static const struct mmc_fixup blk_fixups[] =
{
2365 2366 2367 2368 2369 2370 2371 2372 2373 2374
	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),
2375 2376 2377 2378 2379 2380 2381 2382 2383

	/*
	 * 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.
	 */
2384
	MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2385
		  MMC_QUIRK_BLK_NO_CMD23),
2386
	MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2387
		  MMC_QUIRK_BLK_NO_CMD23),
2388
	MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2389
		  MMC_QUIRK_BLK_NO_CMD23),
2390 2391 2392 2393 2394

	/*
	 * Some Micron MMC cards needs longer data read timeout than
	 * indicated in CSD.
	 */
2395
	MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2396 2397
		  MMC_QUIRK_LONG_READ_TIME),

2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419
	/*
	 * 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),

2420 2421 2422
	END_FIXUP
};

2423
static int mmc_blk_probe(struct device *dev)
L
Linus Torvalds 已提交
2424
{
2425
	struct mmc_card *card = mmc_dev_to_card(dev);
2426
	struct mmc_blk_data *md, *part_md;
2427 2428
	char cap_str[10];

2429 2430 2431 2432
	/*
	 * Check that the card supports the command class(es) we need.
	 */
	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
L
Linus Torvalds 已提交
2433 2434
		return -ENODEV;

2435 2436
	mmc_fixup_device(card, blk_fixups);

L
Linus Torvalds 已提交
2437 2438 2439 2440
	md = mmc_blk_alloc(card);
	if (IS_ERR(md))
		return PTR_ERR(md);

2441
	string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2442
			cap_str, sizeof(cap_str));
2443
	pr_info("%s: %s %s %s %s\n",
L
Linus Torvalds 已提交
2444
		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2445
		cap_str, md->read_only ? "(ro)" : "");
L
Linus Torvalds 已提交
2446

2447 2448 2449
	if (mmc_blk_alloc_parts(card, md))
		goto out;

2450
	dev_set_drvdata(dev, md);
2451

2452 2453 2454 2455 2456 2457 2458
	if (mmc_add_disk(md))
		goto out;

	list_for_each_entry(part_md, &md->part, part) {
		if (mmc_add_disk(part_md))
			goto out;
	}
2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471

	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
2472 2473 2474
	return 0;

 out:
2475 2476
	mmc_blk_remove_parts(card, md);
	mmc_blk_remove_req(md);
2477
	return 0;
L
Linus Torvalds 已提交
2478 2479
}

2480
static int mmc_blk_remove(struct device *dev)
L
Linus Torvalds 已提交
2481
{
2482
	struct mmc_card *card = mmc_dev_to_card(dev);
2483
	struct mmc_blk_data *md = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
2484

2485
	mmc_blk_remove_parts(card, md);
2486
	pm_runtime_get_sync(&card->dev);
2487 2488 2489
	mmc_claim_host(card->host);
	mmc_blk_part_switch(card, md);
	mmc_release_host(card->host);
2490 2491 2492
	if (card->type != MMC_TYPE_SD_COMBO)
		pm_runtime_disable(&card->dev);
	pm_runtime_put_noidle(&card->dev);
2493
	mmc_blk_remove_req(md);
2494
	dev_set_drvdata(dev, NULL);
2495 2496

	return 0;
L
Linus Torvalds 已提交
2497 2498
}

2499
static int _mmc_blk_suspend(struct device *dev)
L
Linus Torvalds 已提交
2500
{
2501
	struct mmc_blk_data *part_md;
2502
	struct mmc_blk_data *md = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
2503 2504 2505

	if (md) {
		mmc_queue_suspend(&md->queue);
2506 2507 2508
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_suspend(&part_md->queue);
		}
L
Linus Torvalds 已提交
2509 2510 2511 2512
	}
	return 0;
}

2513
static void mmc_blk_shutdown(struct device *dev)
2514
{
2515
	_mmc_blk_suspend(dev);
2516 2517
}

2518 2519
#ifdef CONFIG_PM_SLEEP
static int mmc_blk_suspend(struct device *dev)
2520
{
2521
	return _mmc_blk_suspend(dev);
2522 2523
}

2524
static int mmc_blk_resume(struct device *dev)
L
Linus Torvalds 已提交
2525
{
2526
	struct mmc_blk_data *part_md;
2527
	struct mmc_blk_data *md = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
2528 2529

	if (md) {
2530 2531 2532 2533 2534
		/*
		 * 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
2535
		mmc_queue_resume(&md->queue);
2536 2537 2538
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_resume(&part_md->queue);
		}
L
Linus Torvalds 已提交
2539 2540 2541 2542 2543
	}
	return 0;
}
#endif

2544 2545
static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);

2546 2547 2548
static struct device_driver mmc_driver = {
	.name		= "mmcblk",
	.pm		= &mmc_blk_pm_ops,
L
Linus Torvalds 已提交
2549 2550
	.probe		= mmc_blk_probe,
	.remove		= mmc_blk_remove,
2551
	.shutdown	= mmc_blk_shutdown,
L
Linus Torvalds 已提交
2552 2553 2554 2555
};

static int __init mmc_blk_init(void)
{
2556
	int res;
L
Linus Torvalds 已提交
2557

2558 2559 2560
	if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
		pr_info("mmcblk: using %d minors per device\n", perdev_minors);

B
Ben Hutchings 已提交
2561
	max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2562

2563 2564
	res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
	if (res)
L
Linus Torvalds 已提交
2565 2566
		goto out;

2567 2568 2569
	res = mmc_register_driver(&mmc_driver);
	if (res)
		goto out2;
L
Linus Torvalds 已提交
2570

2571 2572 2573
	return 0;
 out2:
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
L
Linus Torvalds 已提交
2574 2575 2576 2577 2578 2579 2580
 out:
	return res;
}

static void __exit mmc_blk_exit(void)
{
	mmc_unregister_driver(&mmc_driver);
2581
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
L
Linus Torvalds 已提交
2582 2583 2584 2585 2586 2587 2588 2589
}

module_init(mmc_blk_init);
module_exit(mmc_blk_exit);

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