block.c 58.6 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/idr.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 <linux/uaccess.h>
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#include "queue.h"
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#include "block.h"
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#include "core.h"
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#include "card.h"
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#include "host.h"
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#include "bus.h"
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#include "mmc_ops.h"
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#include "quirks.h"
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#include "sd_ops.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 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) && \
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				  (rq_data_dir(req) == WRITE))
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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
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 * limited by the MAX_DEVICES below.
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 */
static int max_devices;

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#define MAX_DEVICES 256

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static DEFINE_IDA(mmc_blk_ida);
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/*
 * There is one mmc_blk_data per slot.
 */
struct mmc_blk_data {
	spinlock_t	lock;
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	struct device	*parent;
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	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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	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	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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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 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)
{
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	int devidx = disk->first_minor / perdev_minors;
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	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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		ida_simple_remove(&mmc_blk_ida, devidx);
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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;

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	idata = kmalloc(sizeof(*idata), GFP_KERNEL);
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	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) {
		idata->buf = NULL;
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		return idata;
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	}
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	idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
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	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 mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
				      struct mmc_blk_ioc_data *idata)
{
	struct mmc_ioc_cmd *ic = &idata->ic;

	if (copy_to_user(&(ic_ptr->response), ic->response,
			 sizeof(ic->response)))
		return -EFAULT;

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

	return 0;
}

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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 mmc_card *card, struct mmc_blk_data *md,
			       struct mmc_blk_ioc_data *idata)
440
{
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	struct mmc_command cmd = {};
	struct mmc_data data = {};
	struct mmc_request mrq = {};
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	struct scatterlist sg;
	int err;
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	bool is_rpmb = false;
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	u32 status = 0;
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	if (!card || !md || !idata)
		return -EINVAL;
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	if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
		is_rpmb = true;

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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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	err = mmc_blk_part_switch(card, md);
	if (err)
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		return err;
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	if (idata->ic.is_acmd) {
		err = mmc_app_cmd(card->host, card);
		if (err)
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			return err;
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	}

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

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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);

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		return err;
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	}

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

	/*
	 * 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);

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	memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
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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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	return err;
}

static int mmc_blk_ioctl_cmd(struct block_device *bdev,
			     struct mmc_ioc_cmd __user *ic_ptr)
{
	struct mmc_blk_ioc_data *idata;
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	struct mmc_blk_ioc_data *idatas[1];
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	struct mmc_blk_data *md;
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	struct mmc_queue *mq;
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	struct mmc_card *card;
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	int err = 0, ioc_err = 0;
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	struct request *req;
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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;

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	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;
		goto cmd_err;
	}

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

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	/*
	 * Dispatch the ioctl() into the block request queue.
	 */
	mq = &md->queue;
	req = blk_get_request(mq->queue,
		idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
		__GFP_RECLAIM);
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	idatas[0] = idata;
	req_to_mmc_queue_req(req)->idata = idatas;
	req_to_mmc_queue_req(req)->ioc_count = 1;
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	blk_execute_rq(mq->queue, NULL, req, 0);
	ioc_err = req_to_mmc_queue_req(req)->ioc_result;
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	err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
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	blk_put_request(req);
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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);
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	return ioc_err ? ioc_err : err;
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}

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/*
 * The ioctl commands come back from the block layer after it queued it and
 * processed it with all other requests and then they get issued in this
 * function.
 */
static void mmc_blk_ioctl_cmd_issue(struct mmc_queue *mq, struct request *req)
{
	struct mmc_queue_req *mq_rq;
	struct mmc_card *card = mq->card;
	struct mmc_blk_data *md = mq->blkdata;
	int ioc_err;
631
	int i;
632 633

	mq_rq = req_to_mmc_queue_req(req);
634 635 636 637 638
	for (i = 0; i < mq_rq->ioc_count; i++) {
		ioc_err = __mmc_blk_ioctl_cmd(card, md, mq_rq->idata[i]);
		if (ioc_err)
			break;
	}
639 640 641 642 643 644 645 646 647
	mq_rq->ioc_result = ioc_err;

	/* Always switch back to main area after RPMB access */
	if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
		mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));

	blk_end_request_all(req, ioc_err);
}

648 649 650 651 652 653 654
static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
				   struct mmc_ioc_multi_cmd __user *user)
{
	struct mmc_blk_ioc_data **idata = NULL;
	struct mmc_ioc_cmd __user *cmds = user->cmds;
	struct mmc_card *card;
	struct mmc_blk_data *md;
655
	struct mmc_queue *mq;
656
	int i, err = 0, ioc_err = 0;
657
	__u64 num_of_cmds;
658
	struct request *req;
659

660 661 662 663 664 665 666 667
	/*
	 * 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;

668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688
	if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
			   sizeof(num_of_cmds)))
		return -EFAULT;

	if (num_of_cmds > MMC_IOC_MAX_CMDS)
		return -EINVAL;

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

	for (i = 0; i < num_of_cmds; i++) {
		idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
		if (IS_ERR(idata[i])) {
			err = PTR_ERR(idata[i]);
			num_of_cmds = i;
			goto cmd_err;
		}
	}

	md = mmc_blk_get(bdev->bd_disk);
689 690
	if (!md) {
		err = -EINVAL;
691
		goto cmd_err;
692
	}
693 694 695 696 697 698 699

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

700

701 702 703 704 705 706 707 708 709 710 711
	/*
	 * Dispatch the ioctl()s into the block request queue.
	 */
	mq = &md->queue;
	req = blk_get_request(mq->queue,
		idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
		__GFP_RECLAIM);
	req_to_mmc_queue_req(req)->idata = idata;
	req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
	blk_execute_rq(mq->queue, NULL, req, 0);
	ioc_err = req_to_mmc_queue_req(req)->ioc_result;
712 713

	/* copy to user if data and response */
714
	for (i = 0; i < num_of_cmds && !err; i++)
715 716
		err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);

717 718
	blk_put_request(req);

719 720 721 722 723 724 725 726
cmd_done:
	mmc_blk_put(md);
cmd_err:
	for (i = 0; i < num_of_cmds; i++) {
		kfree(idata[i]->buf);
		kfree(idata[i]);
	}
	kfree(idata);
727
	return ioc_err ? ioc_err : err;
728 729
}

730 731 732
static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
	unsigned int cmd, unsigned long arg)
{
733 734 735 736 737 738 739 740 741 742
	switch (cmd) {
	case MMC_IOC_CMD:
		return mmc_blk_ioctl_cmd(bdev,
				(struct mmc_ioc_cmd __user *)arg);
	case MMC_IOC_MULTI_CMD:
		return mmc_blk_ioctl_multi_cmd(bdev,
				(struct mmc_ioc_multi_cmd __user *)arg);
	default:
		return -EINVAL;
	}
743 744 745 746 747 748 749 750 751 752
}

#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

753
static const struct block_device_operations mmc_bdops = {
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Al Viro 已提交
754 755
	.open			= mmc_blk_open,
	.release		= mmc_blk_release,
756
	.getgeo			= mmc_blk_getgeo,
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Linus Torvalds 已提交
757
	.owner			= THIS_MODULE,
758 759 760 761
	.ioctl			= mmc_blk_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl		= mmc_blk_compat_ioctl,
#endif
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Linus Torvalds 已提交
762 763
};

764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794
static int mmc_blk_part_switch_pre(struct mmc_card *card,
				   unsigned int part_type)
{
	int ret = 0;

	if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
		if (card->ext_csd.cmdq_en) {
			ret = mmc_cmdq_disable(card);
			if (ret)
				return ret;
		}
		mmc_retune_pause(card->host);
	}

	return ret;
}

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

	if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
		mmc_retune_unpause(card->host);
		if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
			ret = mmc_cmdq_enable(card);
	}

	return ret;
}

795 796 797
static inline int mmc_blk_part_switch(struct mmc_card *card,
				      struct mmc_blk_data *md)
{
798
	int ret = 0;
799
	struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
800

801 802 803 804
	if (main_md->part_curr == md->part_type)
		return 0;

	if (mmc_card_mmc(card)) {
805 806
		u8 part_config = card->ext_csd.part_config;

807 808 809
		ret = mmc_blk_part_switch_pre(card, md->part_type);
		if (ret)
			return ret;
810

811 812
		part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
		part_config |= md->part_type;
813 814

		ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
815
				 EXT_CSD_PART_CONFIG, part_config,
816
				 card->ext_csd.part_time);
817
		if (ret) {
818
			mmc_blk_part_switch_post(card, md->part_type);
819
			return ret;
820
		}
821 822

		card->ext_csd.part_config = part_config;
823

824
		ret = mmc_blk_part_switch_post(card, main_md->part_curr);
825
	}
826 827

	main_md->part_curr = md->part_type;
828
	return ret;
829 830
}

831
static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
832 833
{
	int err;
B
Ben Dooks 已提交
834 835
	u32 result;
	__be32 *blocks;
836

837 838 839
	struct mmc_request mrq = {};
	struct mmc_command cmd = {};
	struct mmc_data data = {};
840 841 842 843 844

	struct scatterlist sg;

	cmd.opcode = MMC_APP_CMD;
	cmd.arg = card->rca << 16;
D
David Brownell 已提交
845
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
846 847

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
D
David Brownell 已提交
848
	if (err)
849
		return err;
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David Brownell 已提交
850
	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
851
		return -EIO;
852 853 854 855 856

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

	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
	cmd.arg = 0;
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David Brownell 已提交
857
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
858 859 860 861 862 863

	data.blksz = 4;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;
864
	mmc_set_data_timeout(&data, card);
865 866 867 868

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

B
Ben Dooks 已提交
869 870
	blocks = kmalloc(4, GFP_KERNEL);
	if (!blocks)
871
		return -ENOMEM;
B
Ben Dooks 已提交
872 873

	sg_init_one(&sg, blocks, 4);
874 875 876

	mmc_wait_for_req(card->host, &mrq);

B
Ben Dooks 已提交
877 878 879
	result = ntohl(*blocks);
	kfree(blocks);

P
Pierre Ossman 已提交
880
	if (cmd.error || data.error)
881 882 883
		return -EIO;

	*written_blocks = result;
884

885
	return 0;
886 887
}

888
static int get_card_status(struct mmc_card *card, u32 *status, int retries)
889
{
890
	struct mmc_command cmd = {};
891 892 893 894 895 896
	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;
897 898 899 900
	err = mmc_wait_for_cmd(card->host, &cmd, retries);
	if (err == 0)
		*status = cmd.resp[0];
	return err;
901 902
}

903
static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
904
		bool hw_busy_detect, struct request *req, bool *gen_err)
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
{
	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);
921
			*gen_err = true;
922 923
		}

924 925 926 927 928
		/* We may rely on the host hw to handle busy detection.*/
		if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
			hw_busy_detect)
			break;

929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
		/*
		 * 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;
}

951
static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
952
		struct request *req, bool *gen_err, u32 *stop_status)
953 954
{
	struct mmc_host *host = card->host;
955
	struct mmc_command cmd = {};
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989
	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);
990
		*gen_err = true;
991 992 993 994 995
	}

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

996
#define ERR_NOMEDIUM	3
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
#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 */
1017 1018 1019
		if (!status_valid) {
			pr_err("%s: status not valid, retrying timeout\n",
				req->rq_disk->disk_name);
1020
			return ERR_RETRY;
1021
		}
1022 1023 1024 1025 1026 1027

		/*
		 * 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.
		 */
1028 1029 1030
		if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
			pr_err("%s: command error, retrying timeout\n",
				req->rq_disk->disk_name);
1031
			return ERR_RETRY;
1032
		}
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

		/* 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,
1064
	struct mmc_blk_request *brq, bool *ecc_err, bool *gen_err)
1065 1066 1067 1068 1069
{
	bool prev_cmd_status_valid = true;
	u32 status, stop_status = 0;
	int err, retry;

1070 1071 1072
	if (mmc_card_removed(card))
		return ERR_NOMEDIUM;

1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
	/*
	 * 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;

1083 1084 1085
		/* Re-tune if needed */
		mmc_retune_recheck(card->host);

1086 1087 1088 1089 1090 1091
		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. */
1092 1093 1094 1095
	if (err) {
		/* Check if the card is removed */
		if (mmc_detect_card_removed(card->host))
			return ERR_NOMEDIUM;
1096
		return ERR_ABORT;
1097
	}
1098

1099 1100 1101 1102
	/* 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))
1103
		*ecc_err = true;
1104

1105 1106 1107 1108 1109 1110 1111
	/* 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);
1112
			*gen_err = true;
1113 1114
		}

1115 1116 1117 1118 1119 1120
	/*
	 * 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) {
1121 1122 1123 1124
		err = send_stop(card,
			DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
			req, gen_err, &stop_status);
		if (err) {
1125 1126
			pr_err("%s: error %d sending stop command\n",
			       req->rq_disk->disk_name, err);
1127 1128 1129 1130
			/*
			 * If the stop cmd also timed out, the card is probably
			 * not present, so abort. Other errors are bad news too.
			 */
1131
			return ERR_ABORT;
1132 1133
		}

1134
		if (stop_status & R1_CARD_ECC_FAILED)
1135
			*ecc_err = true;
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	}

	/* 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);

1148 1149 1150 1151
	/* Data errors */
	if (!brq->stop.error)
		return ERR_CONTINUE;

1152
	/* Now for stop errors.  These aren't fatal to the transfer. */
1153
	pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
	       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;
}

1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
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) {
1180 1181
		struct mmc_blk_data *main_md =
			dev_get_drvdata(&host->card->dev);
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
		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;
}

1202 1203
int mmc_access_rpmb(struct mmc_queue *mq)
{
L
Linus Walleij 已提交
1204
	struct mmc_blk_data *md = mq->blkdata;
1205 1206 1207 1208 1209 1210 1211 1212 1213
	/*
	 * If this is a RPMB partition access, return ture
	 */
	if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
		return true;

	return false;
}

1214
static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
A
Adrian Hunter 已提交
1215
{
L
Linus Walleij 已提交
1216
	struct mmc_blk_data *md = mq->blkdata;
A
Adrian Hunter 已提交
1217 1218
	struct mmc_card *card = md->queue.card;
	unsigned int from, nr, arg;
1219
	int err = 0, type = MMC_BLK_DISCARD;
A
Adrian Hunter 已提交
1220 1221 1222

	if (!mmc_can_erase(card)) {
		err = -EOPNOTSUPP;
1223
		goto fail;
A
Adrian Hunter 已提交
1224 1225 1226 1227 1228
	}

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

1229 1230 1231
	if (mmc_can_discard(card))
		arg = MMC_DISCARD_ARG;
	else if (mmc_can_trim(card))
A
Adrian Hunter 已提交
1232 1233 1234
		arg = MMC_TRIM_ARG;
	else
		arg = MMC_ERASE_ARG;
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
	do {
		err = 0;
		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)
			err = mmc_erase(card, from, nr, arg);
	} while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1248 1249
	if (!err)
		mmc_blk_reset_success(md, type);
1250
fail:
1251
	blk_end_request(req, err, blk_rq_bytes(req));
A
Adrian Hunter 已提交
1252 1253
}

1254
static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1255 1256
				       struct request *req)
{
L
Linus Walleij 已提交
1257
	struct mmc_blk_data *md = mq->blkdata;
1258
	struct mmc_card *card = md->queue.card;
1259
	unsigned int from, nr, arg;
1260
	int err = 0, type = MMC_BLK_SECDISCARD;
1261

1262
	if (!(mmc_can_secure_erase_trim(card))) {
1263 1264 1265 1266
		err = -EOPNOTSUPP;
		goto out;
	}

1267 1268 1269
	from = blk_rq_pos(req);
	nr = blk_rq_sectors(req);

1270 1271 1272 1273
	if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
		arg = MMC_SECURE_TRIM1_ARG;
	else
		arg = MMC_SECURE_ERASE_ARG;
1274

1275
retry:
1276 1277 1278 1279 1280 1281 1282 1283
	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)
1284
			goto out_retry;
1285
	}
1286

1287
	err = mmc_erase(card, from, nr, arg);
1288 1289 1290 1291 1292 1293
	if (err == -EIO)
		goto out_retry;
	if (err)
		goto out;

	if (arg == MMC_SECURE_TRIM1_ARG) {
1294 1295 1296 1297 1298 1299
		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)
1300
				goto out_retry;
1301
		}
1302

1303
		err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1304 1305 1306 1307
		if (err == -EIO)
			goto out_retry;
		if (err)
			goto out;
1308
	}
1309 1310 1311

out_retry:
	if (err && !mmc_blk_reset(md, card->host, type))
1312 1313 1314
		goto retry;
	if (!err)
		mmc_blk_reset_success(md, type);
1315
out:
1316
	blk_end_request(req, err, blk_rq_bytes(req));
1317 1318
}

1319
static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
A
Andrei Warkentin 已提交
1320
{
L
Linus Walleij 已提交
1321
	struct mmc_blk_data *md = mq->blkdata;
1322 1323 1324 1325 1326 1327
	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
1328

1329
	blk_end_request_all(req, ret);
A
Andrei Warkentin 已提交
1330 1331 1332 1333 1334 1335 1336 1337 1338
}

/*
 * 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.
 */
1339 1340 1341
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
1342 1343 1344
{
	if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
		/* Legacy mode imposes restrictions on transfers. */
1345
		if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
A
Andrei Warkentin 已提交
1346 1347 1348 1349 1350 1351 1352 1353 1354
			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;
	}
}

1355 1356 1357 1358 1359 1360 1361 1362
#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 */

1363 1364
static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
					     struct mmc_async_req *areq)
1365
{
1366
	struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1367
						    areq);
1368
	struct mmc_blk_request *brq = &mq_mrq->brq;
1369
	struct request *req = mmc_queue_req_to_req(mq_mrq);
1370
	int need_retune = card->host->need_retune;
1371
	bool ecc_err = false;
1372
	bool gen_err = false;
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383

	/*
	 * 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.
	 */
1384 1385
	if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
	    brq->data.error) {
1386
		switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1387 1388 1389 1390
		case ERR_RETRY:
			return MMC_BLK_RETRY;
		case ERR_ABORT:
			return MMC_BLK_ABORT;
1391 1392
		case ERR_NOMEDIUM:
			return MMC_BLK_NOMEDIUM;
1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414
		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) {
1415
		int err;
1416

1417 1418 1419 1420 1421
		/* 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]);
1422
			gen_err = true;
1423 1424
		}

1425 1426
		err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
					&gen_err);
1427 1428
		if (err)
			return MMC_BLK_CMD_ERR;
1429 1430
	}

1431 1432 1433 1434 1435 1436 1437
	/* 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;
	}

1438
	if (brq->data.error) {
1439
		if (need_retune && !brq->retune_retry_done) {
1440 1441
			pr_debug("%s: retrying because a re-tune was needed\n",
				 req->rq_disk->disk_name);
1442 1443 1444
			brq->retune_retry_done = 1;
			return MMC_BLK_RETRY;
		}
1445 1446 1447 1448 1449 1450 1451
		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) {
1452 1453
			if (ecc_err)
				return MMC_BLK_ECC_ERR;
1454 1455 1456 1457 1458 1459
			return MMC_BLK_DATA_ERR;
		} else {
			return MMC_BLK_CMD_ERR;
		}
	}

1460 1461
	if (!brq->data.bytes_xfered)
		return MMC_BLK_RETRY;
1462

1463 1464 1465 1466
	if (blk_rq_bytes(req) != brq->data.bytes_xfered)
		return MMC_BLK_PARTIAL;

	return MMC_BLK_SUCCESS;
1467 1468
}

1469 1470 1471
static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
			      int disable_multi, bool *do_rel_wr,
			      bool *do_data_tag)
L
Linus Torvalds 已提交
1472
{
1473 1474
	struct mmc_blk_data *md = mq->blkdata;
	struct mmc_card *card = md->queue.card;
1475
	struct mmc_blk_request *brq = &mqrq->brq;
1476
	struct request *req = mmc_queue_req_to_req(mqrq);
L
Linus Torvalds 已提交
1477

A
Andrei Warkentin 已提交
1478 1479
	/*
	 * Reliable writes are used to implement Forced Unit Access and
1480
	 * are supported only on MMCs.
A
Andrei Warkentin 已提交
1481
	 */
1482 1483 1484
	*do_rel_wr = (req->cmd_flags & REQ_FUA) &&
		     rq_data_dir(req) == WRITE &&
		     (md->flags & MMC_BLK_REL_WR);
A
Andrei Warkentin 已提交
1485

1486
	memset(brq, 0, sizeof(struct mmc_blk_request));
1487

1488
	brq->mrq.data = &brq->data;
L
Linus Torvalds 已提交
1489

1490 1491
	brq->stop.opcode = MMC_STOP_TRANSMISSION;
	brq->stop.arg = 0;
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501

	if (rq_data_dir(req) == READ) {
		brq->data.flags = MMC_DATA_READ;
		brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
	} else {
		brq->data.flags = MMC_DATA_WRITE;
		brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
	}

	brq->data.blksz = 512;
1502
	brq->data.blocks = blk_rq_sectors(req);
1503

1504 1505 1506 1507 1508 1509 1510
	/*
	 * 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
1511

1512 1513 1514 1515 1516 1517 1518 1519 1520
	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;

1521 1522 1523 1524 1525 1526 1527 1528 1529
		/*
		 * 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);
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
	if (*do_rel_wr)
		mmc_apply_rel_rw(brq, card, req);

	/*
	 * 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);

	mmc_set_data_timeout(&brq->data, card);

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

	/*
	 * Adjust the sg list so it is the same size as the
	 * request.
	 */
	if (brq->data.blocks != blk_rq_sectors(req)) {
		int i, data_size = brq->data.blocks << 9;
		struct scatterlist *sg;

		for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
			data_size -= sg->length;
			if (data_size <= 0) {
				sg->length += data_size;
				i++;
				break;
			}
		}
		brq->data.sg_len = i;
	}

	mqrq->areq.mrq = &brq->mrq;

	mmc_queue_bounce_pre(mqrq);
}

static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
			       struct mmc_card *card,
			       int disable_multi,
			       struct mmc_queue *mq)
{
	u32 readcmd, writecmd;
	struct mmc_blk_request *brq = &mqrq->brq;
1581
	struct request *req = mmc_queue_req_to_req(mqrq);
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
	struct mmc_blk_data *md = mq->blkdata;
	bool do_rel_wr, do_data_tag;

	mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);

	brq->mrq.cmd = &brq->cmd;

	brq->cmd.arg = blk_rq_pos(req);
	if (!mmc_card_blockaddr(card))
		brq->cmd.arg <<= 9;
	brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

1594 1595 1596
	if (brq->data.blocks > 1 || do_rel_wr) {
		/* SPI multiblock writes terminate using a special
		 * token, not a STOP_TRANSMISSION request.
1597
		 */
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
		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;
	}
1608
	brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
S
Saugata Das 已提交
1609

1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
	/*
	 * 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.
	 */
S
Saugata Das 已提交
1628 1629 1630
	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)) {
1631 1632
		brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
		brq->sbc.arg = brq->data.blocks |
S
Saugata Das 已提交
1633 1634
			(do_rel_wr ? (1 << 31) : 0) |
			(do_data_tag ? (1 << 29) : 0);
1635 1636 1637
		brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
		brq->mrq.sbc = &brq->sbc;
	}
1638

1639
	mqrq->areq.err_check = mmc_blk_err_check;
1640
}
1641

1642 1643 1644
static bool mmc_blk_rw_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
			       struct mmc_blk_request *brq, struct request *req,
			       bool old_req_pending)
1645
{
1646 1647
	bool req_pending;

1648 1649 1650 1651 1652 1653 1654 1655 1656 1657
	/*
	 * 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;
1658
		int err;
1659

1660
		err = mmc_sd_num_wr_blocks(card, &blocks);
1661 1662 1663 1664
		if (err)
			req_pending = old_req_pending;
		else
			req_pending = blk_end_request(req, 0, blocks << 9);
1665
	} else {
1666
		req_pending = blk_end_request(req, 0, brq->data.bytes_xfered);
1667
	}
1668
	return req_pending;
1669 1670
}

1671 1672 1673
static void mmc_blk_rw_cmd_abort(struct mmc_queue *mq, struct mmc_card *card,
				 struct request *req,
				 struct mmc_queue_req *mqrq)
1674 1675 1676
{
	if (mmc_card_removed(card))
		req->rq_flags |= RQF_QUIET;
1677
	while (blk_end_request(req, -EIO, blk_rq_cur_bytes(req)));
1678
	mq->qcnt--;
1679 1680
}

1681 1682 1683 1684 1685
/**
 * mmc_blk_rw_try_restart() - tries to restart the current async request
 * @mq: the queue with the card and host to restart
 * @req: a new request that want to be started after the current one
 */
1686 1687
static void mmc_blk_rw_try_restart(struct mmc_queue *mq, struct request *req,
				   struct mmc_queue_req *mqrq)
1688 1689 1690 1691
{
	if (!req)
		return;

1692 1693 1694 1695
	/*
	 * If the card was removed, just cancel everything and return.
	 */
	if (mmc_card_removed(mq->card)) {
1696 1697
		req->rq_flags |= RQF_QUIET;
		blk_end_request_all(req, -EIO);
1698
		mq->qcnt--; /* FIXME: just set to 0? */
1699
		return;
1700
	}
1701
	/* Else proceed and try to restart the current async request */
1702 1703
	mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
	mmc_start_areq(mq->card->host, &mqrq->areq, NULL);
1704 1705
}

L
Linus Walleij 已提交
1706
static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
1707
{
L
Linus Walleij 已提交
1708
	struct mmc_blk_data *md = mq->blkdata;
1709
	struct mmc_card *card = md->queue.card;
1710
	struct mmc_blk_request *brq;
1711
	int disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1712
	enum mmc_blk_status status;
1713
	struct mmc_queue_req *mqrq_cur = NULL;
1714
	struct mmc_queue_req *mq_rq;
L
Linus Walleij 已提交
1715
	struct request *old_req;
1716 1717
	struct mmc_async_req *new_areq;
	struct mmc_async_req *old_areq;
1718
	bool req_pending = true;
L
Linus Torvalds 已提交
1719

1720
	if (new_req) {
1721 1722
		mqrq_cur = req_to_mmc_queue_req(new_req);
		mq->qcnt++;
1723 1724 1725
	}

	if (!mq->qcnt)
1726
		return;
1727

1728
	do {
L
Linus Walleij 已提交
1729
		if (new_req) {
1730 1731 1732 1733
			/*
			 * When 4KB native sector is enabled, only 8 blocks
			 * multiple read or write is allowed
			 */
1734
			if (mmc_large_sector(card) &&
L
Linus Walleij 已提交
1735
				!IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
1736
				pr_err("%s: Transfer size is not 4KB sector size aligned\n",
L
Linus Walleij 已提交
1737
					new_req->rq_disk->disk_name);
1738
				mmc_blk_rw_cmd_abort(mq, card, new_req, mqrq_cur);
1739
				return;
1740
			}
1741

1742 1743
			mmc_blk_rw_rq_prep(mqrq_cur, card, 0, mq);
			new_areq = &mqrq_cur->areq;
1744
		} else
1745 1746
			new_areq = NULL;

1747
		old_areq = mmc_start_areq(card->host, new_areq, &status);
1748
		if (!old_areq) {
1749 1750 1751 1752 1753
			/*
			 * We have just put the first request into the pipeline
			 * and there is nothing more to do until it is
			 * complete.
			 */
1754
			return;
1755
		}
1756

1757 1758 1759 1760
		/*
		 * An asynchronous request has been completed and we proceed
		 * to handle the result of it.
		 */
1761
		mq_rq =	container_of(old_areq, struct mmc_queue_req, areq);
1762
		brq = &mq_rq->brq;
1763
		old_req = mmc_queue_req_to_req(mq_rq);
L
Linus Walleij 已提交
1764
		type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1765
		mmc_queue_bounce_post(mq_rq);
1766

1767 1768 1769 1770 1771 1772
		switch (status) {
		case MMC_BLK_SUCCESS:
		case MMC_BLK_PARTIAL:
			/*
			 * A block was successfully transferred.
			 */
1773
			mmc_blk_reset_success(md, type);
1774

1775 1776
			req_pending = blk_end_request(old_req, 0,
						      brq->data.bytes_xfered);
1777 1778 1779 1780 1781
			/*
			 * 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.
			 */
1782
			if (status == MMC_BLK_SUCCESS && req_pending) {
1783
				pr_err("%s BUG rq_tot %d d_xfer %d\n",
L
Linus Walleij 已提交
1784
				       __func__, blk_rq_bytes(old_req),
1785
				       brq->data.bytes_xfered);
1786
				mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1787
				return;
1788
			}
1789 1790
			break;
		case MMC_BLK_CMD_ERR:
1791
			req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
1792
			if (mmc_blk_reset(md, card->host, type)) {
1793
				if (req_pending)
1794 1795
					mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
				else
1796
					mq->qcnt--;
1797
				mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1798 1799
				return;
			}
1800
			if (!req_pending) {
1801
				mq->qcnt--;
1802
				mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1803 1804
				return;
			}
1805
			break;
1806
		case MMC_BLK_RETRY:
1807
			retune_retry_done = brq->retune_retry_done;
1808
			if (retry++ < 5)
1809
				break;
1810
			/* Fall through */
1811
		case MMC_BLK_ABORT:
1812 1813
			if (!mmc_blk_reset(md, card->host, type))
				break;
1814
			mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1815
			mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1816
			return;
1817 1818 1819 1820 1821 1822
		case MMC_BLK_DATA_ERR: {
			int err;

			err = mmc_blk_reset(md, card->host, type);
			if (!err)
				break;
1823
			if (err == -ENODEV) {
1824
				mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1825
				mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1826 1827
				return;
			}
1828 1829 1830 1831 1832
			/* 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
1833
				pr_warn("%s: retrying using single block read\n",
L
Linus Walleij 已提交
1834
					old_req->rq_disk->disk_name);
1835 1836 1837
				disable_multi = 1;
				break;
			}
1838 1839 1840 1841 1842
			/*
			 * After an error, we redo I/O one sector at a
			 * time, so we only reach here after trying to
			 * read a single sector.
			 */
1843 1844 1845
			req_pending = blk_end_request(old_req, -EIO,
						      brq->data.blksz);
			if (!req_pending) {
1846
				mq->qcnt--;
1847
				mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1848 1849
				return;
			}
1850
			break;
1851
		case MMC_BLK_NOMEDIUM:
1852
			mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1853
			mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1854
			return;
1855 1856
		default:
			pr_err("%s: Unhandled return value (%d)",
L
Linus Walleij 已提交
1857
					old_req->rq_disk->disk_name, status);
1858
			mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1859
			mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1860
			return;
1861 1862
		}

1863
		if (req_pending) {
1864 1865 1866 1867 1868 1869
			/*
			 * In case of a incomplete request
			 * prepare it again and resend.
			 */
			mmc_blk_rw_rq_prep(mq_rq, card,
					disable_multi, mq);
1870
			mmc_start_areq(card->host,
1871
					&mq_rq->areq, NULL);
1872
			mq_rq->brq.retune_retry_done = retune_retry_done;
1873
		}
1874
	} while (req_pending);
1875

1876
	mq->qcnt--;
L
Linus Torvalds 已提交
1877 1878
}

1879
void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
A
Adrian Hunter 已提交
1880
{
1881
	int ret;
L
Linus Walleij 已提交
1882
	struct mmc_blk_data *md = mq->blkdata;
1883 1884
	struct mmc_card *card = md->queue.card;

1885
	if (req && !mq->qcnt)
1886
		/* claim host only for the first request */
1887
		mmc_get_card(card);
1888

1889 1890
	ret = mmc_blk_part_switch(card, md);
	if (ret) {
1891
		if (req) {
1892
			blk_end_request_all(req, -EIO);
1893
		}
1894 1895
		goto out;
	}
1896

1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
	if (req) {
		switch (req_op(req)) {
		case REQ_OP_DRV_IN:
		case REQ_OP_DRV_OUT:
			/*
			 * Complete ongoing async transfer before issuing
			 * ioctl()s
			 */
			if (mq->qcnt)
				mmc_blk_issue_rw_rq(mq, NULL);
			mmc_blk_ioctl_cmd_issue(mq, req);
			break;
		case REQ_OP_DISCARD:
			/*
			 * Complete ongoing async transfer before issuing
			 * discard.
			 */
			if (mq->qcnt)
				mmc_blk_issue_rw_rq(mq, NULL);
			mmc_blk_issue_discard_rq(mq, req);
			break;
		case REQ_OP_SECURE_ERASE:
			/*
			 * Complete ongoing async transfer before issuing
			 * secure erase.
			 */
			if (mq->qcnt)
				mmc_blk_issue_rw_rq(mq, NULL);
			mmc_blk_issue_secdiscard_rq(mq, req);
			break;
		case REQ_OP_FLUSH:
			/*
			 * Complete ongoing async transfer before issuing
			 * flush.
			 */
			if (mq->qcnt)
				mmc_blk_issue_rw_rq(mq, NULL);
			mmc_blk_issue_flush(mq, req);
			break;
		default:
			/* Normal request, just issue it */
			mmc_blk_issue_rw_rq(mq, req);
			card->host->context_info.is_waiting_last_req = false;
			break;
		};
1942
	} else {
1943 1944
		/* No request, flushing the pipeline with NULL */
		mmc_blk_issue_rw_rq(mq, NULL);
1945
		card->host->context_info.is_waiting_last_req = false;
1946
	}
1947

1948
out:
1949
	if (!mq->qcnt)
1950
		mmc_put_card(card);
A
Adrian Hunter 已提交
1951
}
L
Linus Torvalds 已提交
1952

1953 1954 1955 1956 1957 1958
static inline int mmc_blk_readonly(struct mmc_card *card)
{
	return mmc_card_readonly(card) ||
	       !(card->csd.cmdclass & CCC_BLOCK_WRITE);
}

1959 1960 1961 1962
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
					      struct device *parent,
					      sector_t size,
					      bool default_ro,
1963 1964
					      const char *subname,
					      int area_type)
L
Linus Torvalds 已提交
1965 1966 1967 1968
{
	struct mmc_blk_data *md;
	int devidx, ret;

1969 1970 1971
	devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
	if (devidx < 0)
		return ERR_PTR(devidx);
L
Linus Torvalds 已提交
1972

1973
	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1974 1975 1976 1977
	if (!md) {
		ret = -ENOMEM;
		goto out;
	}
L
Linus Torvalds 已提交
1978

1979 1980
	md->area_type = area_type;

1981 1982 1983 1984 1985
	/*
	 * 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
1986

1987
	md->disk = alloc_disk(perdev_minors);
1988 1989 1990 1991
	if (md->disk == NULL) {
		ret = -ENOMEM;
		goto err_kfree;
	}
L
Linus Torvalds 已提交
1992

1993
	spin_lock_init(&md->lock);
1994
	INIT_LIST_HEAD(&md->part);
1995
	md->usage = 1;
L
Linus Torvalds 已提交
1996

1997
	ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1998 1999
	if (ret)
		goto err_putdisk;
L
Linus Torvalds 已提交
2000

L
Linus Walleij 已提交
2001
	md->queue.blkdata = md;
2002

2003
	md->disk->major	= MMC_BLOCK_MAJOR;
2004
	md->disk->first_minor = devidx * perdev_minors;
2005 2006 2007
	md->disk->fops = &mmc_bdops;
	md->disk->private_data = md;
	md->disk->queue = md->queue.queue;
2008
	md->parent = parent;
2009
	set_disk_ro(md->disk, md->read_only || default_ro);
2010
	md->disk->flags = GENHD_FL_EXT_DEVT;
2011
	if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2012
		md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

	/*
	 * 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.
	 */

2026
	snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2027
		 "mmcblk%u%s", card->host->index, subname ? subname : "");
2028

2029 2030 2031 2032 2033 2034
	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);

2035
	set_capacity(md->disk, size);
2036

2037
	if (mmc_host_cmd23(card->host)) {
2038 2039
		if ((mmc_card_mmc(card) &&
		     card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2040 2041 2042 2043
		    (mmc_card_sd(card) &&
		     card->scr.cmds & SD_SCR_CMD23_SUPPORT))
			md->flags |= MMC_BLK_CMD23;
	}
2044 2045 2046 2047 2048 2049

	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;
2050
		blk_queue_write_cache(md->queue.queue, true, true);
2051 2052
	}

2053 2054 2055 2056 2057 2058 2059
	return md;

 err_putdisk:
	put_disk(md->disk);
 err_kfree:
	kfree(md);
 out:
2060
	ida_simple_remove(&mmc_blk_ida, devidx);
2061 2062 2063 2064 2065 2066
	return ERR_PTR(ret);
}

static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
{
	sector_t size;
2067

P
Pierre Ossman 已提交
2068 2069 2070 2071 2072
	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
		/*
		 * The EXT_CSD sector count is in number or 512 byte
		 * sectors.
		 */
2073
		size = card->ext_csd.sectors;
P
Pierre Ossman 已提交
2074 2075 2076 2077 2078
	} else {
		/*
		 * The CSD capacity field is in units of read_blkbits.
		 * set_capacity takes units of 512 bytes.
		 */
2079 2080
		size = (typeof(sector_t))card->csd.capacity
			<< (card->csd.read_blkbits - 9);
P
Pierre Ossman 已提交
2081
	}
2082

2083
	return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2084
					MMC_BLK_DATA_AREA_MAIN);
2085
}
2086

2087 2088 2089 2090 2091
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,
2092 2093
			      const char *subname,
			      int area_type)
2094 2095 2096 2097 2098
{
	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,
2099
				    subname, area_type);
2100 2101 2102 2103 2104
	if (IS_ERR(part_md))
		return PTR_ERR(part_md);
	part_md->part_type = part_type;
	list_add(&part_md->part, &md->part);

2105
	string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2106
			cap_str, sizeof(cap_str));
2107
	pr_info("%s: %s %s partition %u %s\n",
2108 2109 2110 2111 2112
	       part_md->disk->disk_name, mmc_card_id(card),
	       mmc_card_name(card), part_md->part_type, cap_str);
	return 0;
}

2113 2114 2115 2116 2117 2118
/* 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.
 */

2119 2120
static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
{
2121
	int idx, ret = 0;
2122 2123 2124 2125

	if (!mmc_card_mmc(card))
		return 0;

2126 2127 2128 2129 2130 2131
	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,
2132 2133
				card->part[idx].name,
				card->part[idx].area_type);
2134 2135 2136
			if (ret)
				return ret;
		}
2137 2138 2139
	}

	return ret;
L
Linus Torvalds 已提交
2140 2141
}

2142 2143
static void mmc_blk_remove_req(struct mmc_blk_data *md)
{
2144 2145
	struct mmc_card *card;

2146
	if (md) {
2147 2148 2149 2150 2151
		/*
		 * Flush remaining requests and free queues. It
		 * is freeing the queue that stops new requests
		 * from being accepted.
		 */
2152
		card = md->queue.card;
2153
		mmc_cleanup_queue(&md->queue);
2154 2155
		if (md->disk->flags & GENHD_FL_UP) {
			device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2156 2157 2158 2159
			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);
2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182

			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;

	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;
2183
	struct mmc_card *card = md->queue.card;
2184

2185
	device_add_disk(md->parent, md->disk);
2186 2187
	md->force_ro.show = force_ro_show;
	md->force_ro.store = force_ro_store;
2188
	sysfs_attr_init(&md->force_ro.attr);
2189 2190 2191 2192
	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)
2193 2194 2195 2196
		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
2197
		umode_t mode;
2198 2199 2200 2201 2202 2203 2204 2205

		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;
2206
		sysfs_attr_init(&md->power_ro_lock.attr);
2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220
		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);
2221 2222 2223 2224

	return ret;
}

2225
static int mmc_blk_probe(struct mmc_card *card)
L
Linus Torvalds 已提交
2226
{
2227
	struct mmc_blk_data *md, *part_md;
2228 2229
	char cap_str[10];

2230 2231 2232 2233
	/*
	 * Check that the card supports the command class(es) we need.
	 */
	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
L
Linus Torvalds 已提交
2234 2235
		return -ENODEV;

2236
	mmc_fixup_device(card, mmc_blk_fixups);
2237

L
Linus Torvalds 已提交
2238
	md = mmc_blk_alloc(card);
2239
	if (IS_ERR(md))
L
Linus Torvalds 已提交
2240 2241
		return PTR_ERR(md);

2242
	string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2243
			cap_str, sizeof(cap_str));
2244
	pr_info("%s: %s %s %s %s\n",
L
Linus Torvalds 已提交
2245
		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2246
		cap_str, md->read_only ? "(ro)" : "");
L
Linus Torvalds 已提交
2247

2248 2249 2250
	if (mmc_blk_alloc_parts(card, md))
		goto out;

2251
	dev_set_drvdata(&card->dev, md);
2252

2253 2254 2255 2256 2257 2258 2259
	if (mmc_add_disk(md))
		goto out;

	list_for_each_entry(part_md, &md->part, part) {
		if (mmc_add_disk(part_md))
			goto out;
	}
2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272

	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
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	return 0;

 out:
2276 2277
	mmc_blk_remove_parts(card, md);
	mmc_blk_remove_req(md);
2278
	return 0;
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2279 2280
}

2281
static void mmc_blk_remove(struct mmc_card *card)
L
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2282
{
2283
	struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
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2284

2285
	mmc_blk_remove_parts(card, md);
2286
	pm_runtime_get_sync(&card->dev);
2287 2288 2289
	mmc_claim_host(card->host);
	mmc_blk_part_switch(card, md);
	mmc_release_host(card->host);
2290 2291 2292
	if (card->type != MMC_TYPE_SD_COMBO)
		pm_runtime_disable(&card->dev);
	pm_runtime_put_noidle(&card->dev);
2293
	mmc_blk_remove_req(md);
2294
	dev_set_drvdata(&card->dev, NULL);
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}

2297
static int _mmc_blk_suspend(struct mmc_card *card)
L
Linus Torvalds 已提交
2298
{
2299
	struct mmc_blk_data *part_md;
2300
	struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
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2301 2302 2303

	if (md) {
		mmc_queue_suspend(&md->queue);
2304 2305 2306
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_suspend(&part_md->queue);
		}
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Linus Torvalds 已提交
2307 2308 2309 2310
	}
	return 0;
}

2311
static void mmc_blk_shutdown(struct mmc_card *card)
2312
{
2313
	_mmc_blk_suspend(card);
2314 2315
}

2316 2317
#ifdef CONFIG_PM_SLEEP
static int mmc_blk_suspend(struct device *dev)
2318
{
2319 2320 2321
	struct mmc_card *card = mmc_dev_to_card(dev);

	return _mmc_blk_suspend(card);
2322 2323
}

2324
static int mmc_blk_resume(struct device *dev)
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{
2326
	struct mmc_blk_data *part_md;
2327
	struct mmc_blk_data *md = dev_get_drvdata(dev);
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2328 2329

	if (md) {
2330 2331 2332 2333 2334
		/*
		 * 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
2335
		mmc_queue_resume(&md->queue);
2336 2337 2338
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_resume(&part_md->queue);
		}
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	}
	return 0;
}
#endif

2344 2345
static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);

2346 2347 2348 2349 2350
static struct mmc_driver mmc_driver = {
	.drv		= {
		.name	= "mmcblk",
		.pm	= &mmc_blk_pm_ops,
	},
L
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	.probe		= mmc_blk_probe,
	.remove		= mmc_blk_remove,
2353
	.shutdown	= mmc_blk_shutdown,
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2354 2355 2356 2357
};

static int __init mmc_blk_init(void)
{
2358
	int res;
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2359

2360 2361 2362
	if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
		pr_info("mmcblk: using %d minors per device\n", perdev_minors);

B
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2363
	max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2364

2365 2366
	res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
	if (res)
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2367 2368
		goto out;

2369 2370 2371
	res = mmc_register_driver(&mmc_driver);
	if (res)
		goto out2;
L
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2372

2373 2374 2375
	return 0;
 out2:
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
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2376 2377 2378 2379 2380 2381 2382
 out:
	return res;
}

static void __exit mmc_blk_exit(void)
{
	mmc_unregister_driver(&mmc_driver);
2383
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
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2384 2385 2386 2387 2388 2389 2390 2391
}

module_init(mmc_blk_init);
module_exit(mmc_blk_exit);

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