mirror of https://gitee.com/openkylin/linux.git
1765 lines
43 KiB
C
1765 lines
43 KiB
C
/*
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* Block driver for media (i.e., flash cards)
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*
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* Copyright 2002 Hewlett-Packard Company
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* Copyright 2005-2008 Pierre Ossman
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*
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* Use consistent with the GNU GPL is permitted,
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* provided that this copyright notice is
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* preserved in its entirety in all copies and derived works.
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*
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* HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
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* AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
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* FITNESS FOR ANY PARTICULAR PURPOSE.
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*
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* Many thanks to Alessandro Rubini and Jonathan Corbet!
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*
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* Author: Andrew Christian
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* 28 May 2002
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*/
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/kdev_t.h>
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#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>
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#include <linux/capability.h>
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#include <linux/compat.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>
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#include <linux/mmc/sd.h>
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#include <asm/system.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
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#undef MODULE_PARAM_PREFIX
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#endif
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#define MODULE_PARAM_PREFIX "mmcblk."
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#define INAND_CMD38_ARG_EXT_CSD 113
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#define INAND_CMD38_ARG_ERASE 0x00
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#define INAND_CMD38_ARG_TRIM 0x01
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#define INAND_CMD38_ARG_SECERASE 0x80
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#define INAND_CMD38_ARG_SECTRIM1 0x81
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#define INAND_CMD38_ARG_SECTRIM2 0x88
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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
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* or bootarg options.
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*/
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static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
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/*
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* We've only got one major, so number of mmcblk devices is
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* limited to 256 / number of minors per device.
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*/
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static int max_devices;
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/* 256 minors, so at most 256 separate devices */
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static DECLARE_BITMAP(dev_use, 256);
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static DECLARE_BITMAP(name_use, 256);
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/*
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* There is one mmc_blk_data per slot.
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*/
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struct mmc_blk_data {
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spinlock_t lock;
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struct gendisk *disk;
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struct mmc_queue queue;
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struct list_head part;
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unsigned int flags;
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#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
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#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 name_idx;
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unsigned int reset_done;
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#define MMC_BLK_READ BIT(0)
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#define MMC_BLK_WRITE BIT(1)
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#define MMC_BLK_DISCARD BIT(2)
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#define MMC_BLK_SECDISCARD BIT(3)
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/*
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* Only set in main mmc_blk_data associated
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* with mmc_card with mmc_set_drvdata, and keeps
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* track of the current selected device partition.
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*/
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unsigned int part_curr;
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struct device_attribute force_ro;
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};
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static DEFINE_MUTEX(open_lock);
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enum mmc_blk_status {
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MMC_BLK_SUCCESS = 0,
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MMC_BLK_PARTIAL,
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MMC_BLK_CMD_ERR,
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MMC_BLK_RETRY,
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MMC_BLK_ABORT,
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MMC_BLK_DATA_ERR,
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MMC_BLK_ECC_ERR,
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};
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module_param(perdev_minors, int, 0444);
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MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
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static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
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{
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struct mmc_blk_data *md;
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mutex_lock(&open_lock);
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md = disk->private_data;
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if (md && md->usage == 0)
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md = NULL;
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if (md)
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md->usage++;
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mutex_unlock(&open_lock);
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return md;
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}
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static inline int mmc_get_devidx(struct gendisk *disk)
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{
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int devmaj = MAJOR(disk_devt(disk));
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int devidx = MINOR(disk_devt(disk)) / perdev_minors;
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if (!devmaj)
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devidx = disk->first_minor / perdev_minors;
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return devidx;
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}
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static void mmc_blk_put(struct mmc_blk_data *md)
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{
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mutex_lock(&open_lock);
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md->usage--;
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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);
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kfree(md);
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}
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mutex_unlock(&open_lock);
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}
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static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int ret;
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struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
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ret = snprintf(buf, PAGE_SIZE, "%d",
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get_disk_ro(dev_to_disk(dev)) ^
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md->read_only);
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mmc_blk_put(md);
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return ret;
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}
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static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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char *end;
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struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
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unsigned long set = simple_strtoul(buf, &end, 0);
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if (end == buf) {
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ret = -EINVAL;
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goto out;
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}
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set_disk_ro(dev_to_disk(dev), set || md->read_only);
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ret = count;
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out:
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mmc_blk_put(md);
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return ret;
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}
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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) {
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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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}
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static int 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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return 0;
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}
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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);
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geo->heads = 4;
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geo->sectors = 16;
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return 0;
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}
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struct mmc_blk_ioc_data {
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struct mmc_ioc_cmd ic;
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unsigned char *buf;
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u64 buf_bytes;
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};
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static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
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struct mmc_ioc_cmd __user *user)
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{
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struct mmc_blk_ioc_data *idata;
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int err;
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idata = kzalloc(sizeof(*idata), GFP_KERNEL);
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if (!idata) {
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err = -ENOMEM;
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goto out;
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}
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if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
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err = -EFAULT;
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goto idata_err;
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}
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idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
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if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
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err = -EOVERFLOW;
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goto idata_err;
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}
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idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
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if (!idata->buf) {
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err = -ENOMEM;
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goto idata_err;
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}
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if (copy_from_user(idata->buf, (void __user *)(unsigned long)
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idata->ic.data_ptr, idata->buf_bytes)) {
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err = -EFAULT;
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goto copy_err;
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}
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return idata;
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copy_err:
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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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}
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static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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struct mmc_ioc_cmd __user *ic_ptr)
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{
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struct mmc_blk_ioc_data *idata;
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struct mmc_blk_data *md;
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struct mmc_card *card;
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struct mmc_command cmd = {0};
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struct mmc_data data = {0};
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struct mmc_request mrq = {NULL};
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struct scatterlist sg;
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int err;
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/*
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* The caller must have CAP_SYS_RAWIO, and must be calling this on the
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* whole block device, not on a partition. This prevents overspray
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* between sibling partitions.
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*/
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if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
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return -EPERM;
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idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
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if (IS_ERR(idata))
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return PTR_ERR(idata);
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cmd.opcode = idata->ic.opcode;
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cmd.arg = idata->ic.arg;
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cmd.flags = idata->ic.flags;
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data.sg = &sg;
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data.sg_len = 1;
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data.blksz = idata->ic.blksz;
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data.blocks = idata->ic.blocks;
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sg_init_one(data.sg, idata->buf, idata->buf_bytes);
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if (idata->ic.write_flag)
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data.flags = MMC_DATA_WRITE;
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else
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data.flags = MMC_DATA_READ;
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mrq.cmd = &cmd;
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mrq.data = &data;
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md = mmc_blk_get(bdev->bd_disk);
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if (!md) {
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err = -EINVAL;
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goto cmd_done;
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}
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card = md->queue.card;
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto cmd_done;
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}
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mmc_claim_host(card->host);
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if (idata->ic.is_acmd) {
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err = mmc_app_cmd(card->host, card);
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if (err)
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goto cmd_rel_host;
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}
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/* data.flags must already be set before doing this. */
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mmc_set_data_timeout(&data, card);
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/* Allow overriding the timeout_ns for empirical tuning. */
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if (idata->ic.data_timeout_ns)
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data.timeout_ns = idata->ic.data_timeout_ns;
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if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
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/*
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* Pretend this is a data transfer and rely on the host driver
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* to compute timeout. When all host drivers support
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* cmd.cmd_timeout for R1B, this can be changed to:
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*
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* mrq.data = NULL;
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* cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
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*/
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data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
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}
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mmc_wait_for_req(card->host, &mrq);
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if (cmd.error) {
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dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
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__func__, cmd.error);
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err = cmd.error;
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goto cmd_rel_host;
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}
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if (data.error) {
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dev_err(mmc_dev(card->host), "%s: data error %d\n",
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__func__, data.error);
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err = data.error;
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goto cmd_rel_host;
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}
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|
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/*
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* According to the SD specs, some commands require a delay after
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* issuing the command.
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*/
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if (idata->ic.postsleep_min_us)
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usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
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if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
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err = -EFAULT;
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goto cmd_rel_host;
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}
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if (!idata->ic.write_flag) {
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if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
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idata->buf, idata->buf_bytes)) {
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err = -EFAULT;
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goto cmd_rel_host;
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}
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}
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cmd_rel_host:
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mmc_release_host(card->host);
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|
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cmd_done:
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mmc_blk_put(md);
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kfree(idata->buf);
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kfree(idata);
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return err;
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}
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|
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static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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int ret = -EINVAL;
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if (cmd == MMC_IOC_CMD)
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ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
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return ret;
|
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}
|
|
|
|
#ifdef CONFIG_COMPAT
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static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
|
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return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
|
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}
|
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#endif
|
|
|
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static const struct block_device_operations mmc_bdops = {
|
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.open = mmc_blk_open,
|
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.release = mmc_blk_release,
|
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.getgeo = mmc_blk_getgeo,
|
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.owner = THIS_MODULE,
|
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.ioctl = mmc_blk_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mmc_blk_compat_ioctl,
|
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#endif
|
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};
|
|
|
|
static inline int mmc_blk_part_switch(struct mmc_card *card,
|
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struct mmc_blk_data *md)
|
|
{
|
|
int ret;
|
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struct mmc_blk_data *main_md = mmc_get_drvdata(card);
|
|
|
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if (main_md->part_curr == md->part_type)
|
|
return 0;
|
|
|
|
if (mmc_card_mmc(card)) {
|
|
u8 part_config = card->ext_csd.part_config;
|
|
|
|
part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
|
|
part_config |= md->part_type;
|
|
|
|
ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
EXT_CSD_PART_CONFIG, part_config,
|
|
card->ext_csd.part_time);
|
|
if (ret)
|
|
return ret;
|
|
|
|
card->ext_csd.part_config = part_config;
|
|
}
|
|
|
|
main_md->part_curr = md->part_type;
|
|
return 0;
|
|
}
|
|
|
|
static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
|
|
{
|
|
int err;
|
|
u32 result;
|
|
__be32 *blocks;
|
|
|
|
struct mmc_request mrq = {NULL};
|
|
struct mmc_command cmd = {0};
|
|
struct mmc_data data = {0};
|
|
unsigned int timeout_us;
|
|
|
|
struct scatterlist sg;
|
|
|
|
cmd.opcode = MMC_APP_CMD;
|
|
cmd.arg = card->rca << 16;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
|
|
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 0);
|
|
if (err)
|
|
return (u32)-1;
|
|
if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
|
|
return (u32)-1;
|
|
|
|
memset(&cmd, 0, sizeof(struct mmc_command));
|
|
|
|
cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
|
|
|
|
data.timeout_ns = card->csd.tacc_ns * 100;
|
|
data.timeout_clks = card->csd.tacc_clks * 100;
|
|
|
|
timeout_us = data.timeout_ns / 1000;
|
|
timeout_us += data.timeout_clks * 1000 /
|
|
(card->host->ios.clock / 1000);
|
|
|
|
if (timeout_us > 100000) {
|
|
data.timeout_ns = 100000000;
|
|
data.timeout_clks = 0;
|
|
}
|
|
|
|
data.blksz = 4;
|
|
data.blocks = 1;
|
|
data.flags = MMC_DATA_READ;
|
|
data.sg = &sg;
|
|
data.sg_len = 1;
|
|
|
|
mrq.cmd = &cmd;
|
|
mrq.data = &data;
|
|
|
|
blocks = kmalloc(4, GFP_KERNEL);
|
|
if (!blocks)
|
|
return (u32)-1;
|
|
|
|
sg_init_one(&sg, blocks, 4);
|
|
|
|
mmc_wait_for_req(card->host, &mrq);
|
|
|
|
result = ntohl(*blocks);
|
|
kfree(blocks);
|
|
|
|
if (cmd.error || data.error)
|
|
result = (u32)-1;
|
|
|
|
return result;
|
|
}
|
|
|
|
static int send_stop(struct mmc_card *card, u32 *status)
|
|
{
|
|
struct mmc_command cmd = {0};
|
|
int err;
|
|
|
|
cmd.opcode = MMC_STOP_TRANSMISSION;
|
|
cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, 5);
|
|
if (err == 0)
|
|
*status = cmd.resp[0];
|
|
return err;
|
|
}
|
|
|
|
static int get_card_status(struct mmc_card *card, u32 *status, int retries)
|
|
{
|
|
struct mmc_command cmd = {0};
|
|
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;
|
|
err = mmc_wait_for_cmd(card->host, &cmd, retries);
|
|
if (err == 0)
|
|
*status = cmd.resp[0];
|
|
return err;
|
|
}
|
|
|
|
#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,
|
|
struct mmc_blk_request *brq, int *ecc_err)
|
|
{
|
|
bool prev_cmd_status_valid = true;
|
|
u32 status, stop_status = 0;
|
|
int err, retry;
|
|
|
|
/*
|
|
* 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. */
|
|
if (err)
|
|
return ERR_ABORT;
|
|
|
|
/* 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;
|
|
|
|
/*
|
|
* 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) {
|
|
err = send_stop(card, &stop_status);
|
|
if (err)
|
|
pr_err("%s: error %d sending stop command\n",
|
|
req->rq_disk->disk_name, err);
|
|
|
|
/*
|
|
* If the stop cmd also timed out, the card is probably
|
|
* not present, so abort. Other errors are bad news too.
|
|
*/
|
|
if (err)
|
|
return ERR_ABORT;
|
|
if (stop_status & R1_CARD_ECC_FAILED)
|
|
*ecc_err = 1;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/* Data errors */
|
|
if (!brq->stop.error)
|
|
return ERR_CONTINUE;
|
|
|
|
/* Now for stop errors. These aren't fatal to the transfer. */
|
|
pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
|
|
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;
|
|
}
|
|
|
|
static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
|
|
int type)
|
|
{
|
|
int err;
|
|
|
|
if (md->reset_done & type)
|
|
return -EEXIST;
|
|
|
|
md->reset_done |= type;
|
|
err = mmc_hw_reset(host);
|
|
/* Ensure we switch back to the correct partition */
|
|
if (err != -EOPNOTSUPP) {
|
|
struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
|
|
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;
|
|
}
|
|
|
|
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;
|
|
int err = 0, type = MMC_BLK_DISCARD;
|
|
|
|
if (!mmc_can_erase(card)) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
from = blk_rq_pos(req);
|
|
nr = blk_rq_sectors(req);
|
|
|
|
if (mmc_can_discard(card))
|
|
arg = MMC_DISCARD_ARG;
|
|
else if (mmc_can_trim(card))
|
|
arg = MMC_TRIM_ARG;
|
|
else
|
|
arg = MMC_ERASE_ARG;
|
|
retry:
|
|
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
INAND_CMD38_ARG_EXT_CSD,
|
|
arg == MMC_TRIM_ARG ?
|
|
INAND_CMD38_ARG_TRIM :
|
|
INAND_CMD38_ARG_ERASE,
|
|
0);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = mmc_erase(card, from, nr, arg);
|
|
out:
|
|
if (err == -EIO && !mmc_blk_reset(md, card->host, type))
|
|
goto retry;
|
|
if (!err)
|
|
mmc_blk_reset_success(md, type);
|
|
spin_lock_irq(&md->lock);
|
|
__blk_end_request(req, err, blk_rq_bytes(req));
|
|
spin_unlock_irq(&md->lock);
|
|
|
|
return err ? 0 : 1;
|
|
}
|
|
|
|
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;
|
|
unsigned int from, nr, arg;
|
|
int err = 0, type = MMC_BLK_SECDISCARD;
|
|
|
|
if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
|
|
err = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
/* The sanitize operation is supported at v4.5 only */
|
|
if (mmc_can_sanitize(card)) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
EXT_CSD_SANITIZE_START, 1, 0);
|
|
goto out;
|
|
}
|
|
|
|
from = blk_rq_pos(req);
|
|
nr = blk_rq_sectors(req);
|
|
|
|
if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
|
|
arg = MMC_SECURE_TRIM1_ARG;
|
|
else
|
|
arg = MMC_SECURE_ERASE_ARG;
|
|
retry:
|
|
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
INAND_CMD38_ARG_EXT_CSD,
|
|
arg == MMC_SECURE_TRIM1_ARG ?
|
|
INAND_CMD38_ARG_SECTRIM1 :
|
|
INAND_CMD38_ARG_SECERASE,
|
|
0);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = mmc_erase(card, from, nr, arg);
|
|
if (!err && arg == MMC_SECURE_TRIM1_ARG) {
|
|
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
|
|
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
|
|
INAND_CMD38_ARG_EXT_CSD,
|
|
INAND_CMD38_ARG_SECTRIM2,
|
|
0);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
|
|
}
|
|
out:
|
|
if (err == -EIO && !mmc_blk_reset(md, card->host, type))
|
|
goto retry;
|
|
if (!err)
|
|
mmc_blk_reset_success(md, type);
|
|
spin_lock_irq(&md->lock);
|
|
__blk_end_request(req, err, blk_rq_bytes(req));
|
|
spin_unlock_irq(&md->lock);
|
|
|
|
return err ? 0 : 1;
|
|
}
|
|
|
|
static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
struct mmc_blk_data *md = mq->data;
|
|
struct mmc_card *card = md->queue.card;
|
|
int ret = 0;
|
|
|
|
ret = mmc_flush_cache(card);
|
|
if (ret)
|
|
ret = -EIO;
|
|
|
|
spin_lock_irq(&md->lock);
|
|
__blk_end_request_all(req, ret);
|
|
spin_unlock_irq(&md->lock);
|
|
|
|
return ret ? 0 : 1;
|
|
}
|
|
|
|
/*
|
|
* Reformat current write as a reliable write, supporting
|
|
* both legacy and the enhanced reliable write MMC cards.
|
|
* In each transfer we'll handle only as much as a single
|
|
* reliable write can handle, thus finish the request in
|
|
* partial completions.
|
|
*/
|
|
static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
|
|
struct mmc_card *card,
|
|
struct request *req)
|
|
{
|
|
if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
|
|
/* Legacy mode imposes restrictions on transfers. */
|
|
if (!IS_ALIGNED(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;
|
|
}
|
|
}
|
|
|
|
#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 */
|
|
|
|
static int mmc_blk_err_check(struct mmc_card *card,
|
|
struct mmc_async_req *areq)
|
|
{
|
|
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;
|
|
int ecc_err = 0;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
|
|
brq->data.error) {
|
|
switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
|
|
case ERR_RETRY:
|
|
return MMC_BLK_RETRY;
|
|
case ERR_ABORT:
|
|
return MMC_BLK_ABORT;
|
|
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) {
|
|
u32 status;
|
|
do {
|
|
int err = get_card_status(card, &status, 5);
|
|
if (err) {
|
|
pr_err("%s: error %d requesting status\n",
|
|
req->rq_disk->disk_name, err);
|
|
return MMC_BLK_CMD_ERR;
|
|
}
|
|
/*
|
|
* 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));
|
|
}
|
|
|
|
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) {
|
|
if (ecc_err)
|
|
return MMC_BLK_ECC_ERR;
|
|
return MMC_BLK_DATA_ERR;
|
|
} else {
|
|
return MMC_BLK_CMD_ERR;
|
|
}
|
|
}
|
|
|
|
if (!brq->data.bytes_xfered)
|
|
return MMC_BLK_RETRY;
|
|
|
|
if (blk_rq_bytes(req) != brq->data.bytes_xfered)
|
|
return MMC_BLK_PARTIAL;
|
|
|
|
return MMC_BLK_SUCCESS;
|
|
}
|
|
|
|
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;
|
|
struct request *req = mqrq->req;
|
|
struct mmc_blk_data *md = mq->data;
|
|
|
|
/*
|
|
* Reliable writes are used to implement Forced Unit Access and
|
|
* REQ_META accesses, and are supported only on MMCs.
|
|
*
|
|
* XXX: this really needs a good explanation of why REQ_META
|
|
* is treated special.
|
|
*/
|
|
bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
|
|
(req->cmd_flags & REQ_META)) &&
|
|
(rq_data_dir(req) == WRITE) &&
|
|
(md->flags & MMC_BLK_REL_WR);
|
|
|
|
memset(brq, 0, sizeof(struct mmc_blk_request));
|
|
brq->mrq.cmd = &brq->cmd;
|
|
brq->mrq.data = &brq->data;
|
|
|
|
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->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
|
|
brq->data.blocks = blk_rq_sectors(req);
|
|
|
|
/*
|
|
* The block layer doesn't support all sector count
|
|
* restrictions, so we need to be prepared for too big
|
|
* requests.
|
|
*/
|
|
if (brq->data.blocks > card->host->max_blk_count)
|
|
brq->data.blocks = card->host->max_blk_count;
|
|
|
|
if (brq->data.blocks > 1) {
|
|
/*
|
|
* 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;
|
|
|
|
/* Some controllers can't do multiblock reads due to hw bugs */
|
|
if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
|
|
rq_data_dir(req) == READ)
|
|
brq->data.blocks = 1;
|
|
}
|
|
|
|
if (brq->data.blocks > 1 || do_rel_wr) {
|
|
/* SPI multiblock writes terminate using a special
|
|
* token, not a STOP_TRANSMISSION request.
|
|
*/
|
|
if (!mmc_host_is_spi(card->host) ||
|
|
rq_data_dir(req) == READ)
|
|
brq->mrq.stop = &brq->stop;
|
|
readcmd = MMC_READ_MULTIPLE_BLOCK;
|
|
writecmd = MMC_WRITE_MULTIPLE_BLOCK;
|
|
} else {
|
|
brq->mrq.stop = NULL;
|
|
readcmd = MMC_READ_SINGLE_BLOCK;
|
|
writecmd = MMC_WRITE_BLOCK;
|
|
}
|
|
if (rq_data_dir(req) == READ) {
|
|
brq->cmd.opcode = readcmd;
|
|
brq->data.flags |= MMC_DATA_READ;
|
|
} else {
|
|
brq->cmd.opcode = writecmd;
|
|
brq->data.flags |= MMC_DATA_WRITE;
|
|
}
|
|
|
|
if (do_rel_wr)
|
|
mmc_apply_rel_rw(brq, card, req);
|
|
|
|
/*
|
|
* Pre-defined multi-block transfers are preferable to
|
|
* open ended-ones (and necessary for reliable writes).
|
|
* However, it is not sufficient to just send CMD23,
|
|
* and avoid the final CMD12, as on an error condition
|
|
* CMD12 (stop) needs to be sent anyway. This, coupled
|
|
* with Auto-CMD23 enhancements provided by some
|
|
* hosts, means that the complexity of dealing
|
|
* with this is best left to the host. If CMD23 is
|
|
* supported by card and host, we'll fill sbc in and let
|
|
* the host deal with handling it correctly. This means
|
|
* that for hosts that don't expose MMC_CAP_CMD23, no
|
|
* change of behavior will be observed.
|
|
*
|
|
* N.B: Some MMC cards experience perf degradation.
|
|
* We'll avoid using CMD23-bounded multiblock writes for
|
|
* these, while retaining features like reliable writes.
|
|
*/
|
|
|
|
if ((md->flags & MMC_BLK_CMD23) &&
|
|
mmc_op_multi(brq->cmd.opcode) &&
|
|
(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
|
|
brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
|
|
brq->sbc.arg = brq->data.blocks |
|
|
(do_rel_wr ? (1 << 31) : 0);
|
|
brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
|
|
brq->mrq.sbc = &brq->sbc;
|
|
}
|
|
|
|
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->mmc_active.mrq = &brq->mrq;
|
|
mqrq->mmc_active.err_check = mmc_blk_err_check;
|
|
|
|
mmc_queue_bounce_pre(mqrq);
|
|
}
|
|
|
|
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)
|
|
{
|
|
/*
|
|
* 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) {
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, 0, blocks << 9);
|
|
spin_unlock_irq(&md->lock);
|
|
}
|
|
} else {
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
|
|
spin_unlock_irq(&md->lock);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
|
|
{
|
|
struct mmc_blk_data *md = mq->data;
|
|
struct mmc_card *card = md->queue.card;
|
|
struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
|
|
int ret = 1, disable_multi = 0, retry = 0, type;
|
|
enum mmc_blk_status status;
|
|
struct mmc_queue_req *mq_rq;
|
|
struct request *req;
|
|
struct mmc_async_req *areq;
|
|
|
|
if (!rqc && !mq->mqrq_prev->req)
|
|
return 0;
|
|
|
|
do {
|
|
if (rqc) {
|
|
mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
|
|
areq = &mq->mqrq_cur->mmc_active;
|
|
} else
|
|
areq = NULL;
|
|
areq = mmc_start_req(card->host, areq, (int *) &status);
|
|
if (!areq)
|
|
return 0;
|
|
|
|
mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
|
|
brq = &mq_rq->brq;
|
|
req = mq_rq->req;
|
|
type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
|
|
mmc_queue_bounce_post(mq_rq);
|
|
|
|
switch (status) {
|
|
case MMC_BLK_SUCCESS:
|
|
case MMC_BLK_PARTIAL:
|
|
/*
|
|
* A block was successfully transferred.
|
|
*/
|
|
mmc_blk_reset_success(md, type);
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, 0,
|
|
brq->data.bytes_xfered);
|
|
spin_unlock_irq(&md->lock);
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (status == MMC_BLK_SUCCESS && ret) {
|
|
pr_err("%s BUG rq_tot %d d_xfer %d\n",
|
|
__func__, blk_rq_bytes(req),
|
|
brq->data.bytes_xfered);
|
|
rqc = NULL;
|
|
goto cmd_abort;
|
|
}
|
|
break;
|
|
case MMC_BLK_CMD_ERR:
|
|
ret = mmc_blk_cmd_err(md, card, brq, req, ret);
|
|
if (!mmc_blk_reset(md, card->host, type))
|
|
break;
|
|
goto cmd_abort;
|
|
case MMC_BLK_RETRY:
|
|
if (retry++ < 5)
|
|
break;
|
|
/* Fall through */
|
|
case MMC_BLK_ABORT:
|
|
if (!mmc_blk_reset(md, card->host, type))
|
|
break;
|
|
goto cmd_abort;
|
|
case MMC_BLK_DATA_ERR: {
|
|
int err;
|
|
|
|
err = mmc_blk_reset(md, card->host, type);
|
|
if (!err)
|
|
break;
|
|
if (err == -ENODEV)
|
|
goto cmd_abort;
|
|
/* Fall through */
|
|
}
|
|
case MMC_BLK_ECC_ERR:
|
|
if (brq->data.blocks > 1) {
|
|
/* Redo read one sector at a time */
|
|
pr_warning("%s: retrying using single block read\n",
|
|
req->rq_disk->disk_name);
|
|
disable_multi = 1;
|
|
break;
|
|
}
|
|
/*
|
|
* After an error, we redo I/O one sector at a
|
|
* time, so we only reach here after trying to
|
|
* read a single sector.
|
|
*/
|
|
spin_lock_irq(&md->lock);
|
|
ret = __blk_end_request(req, -EIO,
|
|
brq->data.blksz);
|
|
spin_unlock_irq(&md->lock);
|
|
if (!ret)
|
|
goto start_new_req;
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
/*
|
|
* 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);
|
|
}
|
|
} while (ret);
|
|
|
|
return 1;
|
|
|
|
cmd_abort:
|
|
spin_lock_irq(&md->lock);
|
|
while (ret)
|
|
ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
|
|
spin_unlock_irq(&md->lock);
|
|
|
|
start_new_req:
|
|
if (rqc) {
|
|
mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
|
|
mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
|
|
{
|
|
int ret;
|
|
struct mmc_blk_data *md = mq->data;
|
|
struct mmc_card *card = md->queue.card;
|
|
|
|
if (req && !mq->mqrq_prev->req)
|
|
/* claim host only for the first request */
|
|
mmc_claim_host(card->host);
|
|
|
|
ret = mmc_blk_part_switch(card, md);
|
|
if (ret) {
|
|
if (req) {
|
|
spin_lock_irq(&md->lock);
|
|
__blk_end_request_all(req, -EIO);
|
|
spin_unlock_irq(&md->lock);
|
|
}
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (req && req->cmd_flags & REQ_DISCARD) {
|
|
/* complete ongoing async transfer before issuing discard */
|
|
if (card->host->areq)
|
|
mmc_blk_issue_rw_rq(mq, NULL);
|
|
if (req->cmd_flags & REQ_SECURE)
|
|
ret = mmc_blk_issue_secdiscard_rq(mq, req);
|
|
else
|
|
ret = mmc_blk_issue_discard_rq(mq, req);
|
|
} else if (req && req->cmd_flags & REQ_FLUSH) {
|
|
/* complete ongoing async transfer before issuing flush */
|
|
if (card->host->areq)
|
|
mmc_blk_issue_rw_rq(mq, NULL);
|
|
ret = mmc_blk_issue_flush(mq, req);
|
|
} else {
|
|
ret = mmc_blk_issue_rw_rq(mq, req);
|
|
}
|
|
|
|
out:
|
|
if (!req)
|
|
/* release host only when there are no more requests */
|
|
mmc_release_host(card->host);
|
|
return ret;
|
|
}
|
|
|
|
static inline int mmc_blk_readonly(struct mmc_card *card)
|
|
{
|
|
return mmc_card_readonly(card) ||
|
|
!(card->csd.cmdclass & CCC_BLOCK_WRITE);
|
|
}
|
|
|
|
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
|
|
struct device *parent,
|
|
sector_t size,
|
|
bool default_ro,
|
|
const char *subname)
|
|
{
|
|
struct mmc_blk_data *md;
|
|
int devidx, ret;
|
|
|
|
devidx = find_first_zero_bit(dev_use, max_devices);
|
|
if (devidx >= max_devices)
|
|
return ERR_PTR(-ENOSPC);
|
|
__set_bit(devidx, dev_use);
|
|
|
|
md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
|
|
if (!md) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* !subname implies we are creating main mmc_blk_data that will be
|
|
* associated with mmc_card with mmc_set_drvdata. Due to device
|
|
* 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);
|
|
}
|
|
else
|
|
md->name_idx = ((struct mmc_blk_data *)
|
|
dev_to_disk(parent)->private_data)->name_idx;
|
|
|
|
/*
|
|
* Set the read-only status based on the supported commands
|
|
* and the write protect switch.
|
|
*/
|
|
md->read_only = mmc_blk_readonly(card);
|
|
|
|
md->disk = alloc_disk(perdev_minors);
|
|
if (md->disk == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_kfree;
|
|
}
|
|
|
|
spin_lock_init(&md->lock);
|
|
INIT_LIST_HEAD(&md->part);
|
|
md->usage = 1;
|
|
|
|
ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
|
|
if (ret)
|
|
goto err_putdisk;
|
|
|
|
md->queue.issue_fn = mmc_blk_issue_rq;
|
|
md->queue.data = md;
|
|
|
|
md->disk->major = MMC_BLOCK_MAJOR;
|
|
md->disk->first_minor = devidx * perdev_minors;
|
|
md->disk->fops = &mmc_bdops;
|
|
md->disk->private_data = md;
|
|
md->disk->queue = md->queue.queue;
|
|
md->disk->driverfs_dev = parent;
|
|
set_disk_ro(md->disk, md->read_only || default_ro);
|
|
|
|
/*
|
|
* As discussed on lkml, GENHD_FL_REMOVABLE should:
|
|
*
|
|
* - be set for removable media with permanent block devices
|
|
* - be unset for removable block devices with permanent media
|
|
*
|
|
* Since MMC block devices clearly fall under the second
|
|
* case, we do not set GENHD_FL_REMOVABLE. Userspace
|
|
* should use the block device creation/destruction hotplug
|
|
* messages to tell when the card is present.
|
|
*/
|
|
|
|
snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
|
|
"mmcblk%d%s", md->name_idx, subname ? subname : "");
|
|
|
|
blk_queue_logical_block_size(md->queue.queue, 512);
|
|
set_capacity(md->disk, size);
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
|
|
if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
|
|
/*
|
|
* The EXT_CSD sector count is in number or 512 byte
|
|
* sectors.
|
|
*/
|
|
size = card->ext_csd.sectors;
|
|
} else {
|
|
/*
|
|
* The CSD capacity field is in units of read_blkbits.
|
|
* set_capacity takes units of 512 bytes.
|
|
*/
|
|
size = card->csd.capacity << (card->csd.read_blkbits - 9);
|
|
}
|
|
|
|
md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL);
|
|
return md;
|
|
}
|
|
|
|
static int mmc_blk_alloc_part(struct mmc_card *card,
|
|
struct mmc_blk_data *md,
|
|
unsigned int part_type,
|
|
sector_t size,
|
|
bool default_ro,
|
|
const char *subname)
|
|
{
|
|
char cap_str[10];
|
|
struct mmc_blk_data *part_md;
|
|
|
|
part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
|
|
subname);
|
|
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));
|
|
pr_info("%s: %s %s partition %u %s\n",
|
|
part_md->disk->disk_name, mmc_card_id(card),
|
|
mmc_card_name(card), part_md->part_type, cap_str);
|
|
return 0;
|
|
}
|
|
|
|
/* MMC Physical partitions consist of two boot partitions and
|
|
* up to four general purpose partitions.
|
|
* For each partition enabled in EXT_CSD a block device will be allocatedi
|
|
* to provide access to the partition.
|
|
*/
|
|
|
|
static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
|
|
{
|
|
int idx, ret = 0;
|
|
|
|
if (!mmc_card_mmc(card))
|
|
return 0;
|
|
|
|
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,
|
|
card->part[idx].name);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
|
|
{
|
|
int err;
|
|
|
|
mmc_claim_host(card->host);
|
|
err = mmc_set_blocklen(card, 512);
|
|
mmc_release_host(card->host);
|
|
|
|
if (err) {
|
|
pr_err("%s: unable to set block size to 512: %d\n",
|
|
md->disk->disk_name, err);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmc_blk_remove_req(struct mmc_blk_data *md)
|
|
{
|
|
if (md) {
|
|
if (md->disk->flags & GENHD_FL_UP) {
|
|
device_remove_file(disk_to_dev(md->disk), &md->force_ro);
|
|
|
|
/* Stop new requests from getting into the queue */
|
|
del_gendisk(md->disk);
|
|
}
|
|
|
|
/* Then flush out any already in there */
|
|
mmc_cleanup_queue(&md->queue);
|
|
mmc_blk_put(md);
|
|
}
|
|
}
|
|
|
|
static void mmc_blk_remove_parts(struct mmc_card *card,
|
|
struct mmc_blk_data *md)
|
|
{
|
|
struct list_head *pos, *q;
|
|
struct mmc_blk_data *part_md;
|
|
|
|
__clear_bit(md->name_idx, name_use);
|
|
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;
|
|
|
|
add_disk(md->disk);
|
|
md->force_ro.show = force_ro_show;
|
|
md->force_ro.store = force_ro_store;
|
|
sysfs_attr_init(&md->force_ro.attr);
|
|
md->force_ro.attr.name = "force_ro";
|
|
md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
|
|
ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
|
|
if (ret)
|
|
del_gendisk(md->disk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct mmc_fixup blk_fixups[] =
|
|
{
|
|
MMC_FIXUP("SEM02G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
|
|
MMC_FIXUP("SEM04G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
|
|
MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
|
|
MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
|
|
MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
MMC_FIXUP("MMC08G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
|
|
MMC_QUIRK_BLK_NO_CMD23),
|
|
MMC_FIXUP("MMC16G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
|
|
MMC_QUIRK_BLK_NO_CMD23),
|
|
MMC_FIXUP("MMC32G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
|
|
MMC_QUIRK_BLK_NO_CMD23),
|
|
|
|
/*
|
|
* Some Micron MMC cards needs longer data read timeout than
|
|
* indicated in CSD.
|
|
*/
|
|
MMC_FIXUP(CID_NAME_ANY, 0x13, 0x200, add_quirk_mmc,
|
|
MMC_QUIRK_LONG_READ_TIME),
|
|
|
|
END_FIXUP
|
|
};
|
|
|
|
static int mmc_blk_probe(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md, *part_md;
|
|
int err;
|
|
char cap_str[10];
|
|
|
|
/*
|
|
* Check that the card supports the command class(es) we need.
|
|
*/
|
|
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
|
|
return -ENODEV;
|
|
|
|
md = mmc_blk_alloc(card);
|
|
if (IS_ERR(md))
|
|
return PTR_ERR(md);
|
|
|
|
err = mmc_blk_set_blksize(md, card);
|
|
if (err)
|
|
goto out;
|
|
|
|
string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
|
|
cap_str, sizeof(cap_str));
|
|
pr_info("%s: %s %s %s %s\n",
|
|
md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
|
|
cap_str, md->read_only ? "(ro)" : "");
|
|
|
|
if (mmc_blk_alloc_parts(card, md))
|
|
goto out;
|
|
|
|
mmc_set_drvdata(card, md);
|
|
mmc_fixup_device(card, blk_fixups);
|
|
|
|
if (mmc_add_disk(md))
|
|
goto out;
|
|
|
|
list_for_each_entry(part_md, &md->part, part) {
|
|
if (mmc_add_disk(part_md))
|
|
goto out;
|
|
}
|
|
return 0;
|
|
|
|
out:
|
|
mmc_blk_remove_parts(card, md);
|
|
mmc_blk_remove_req(md);
|
|
return err;
|
|
}
|
|
|
|
static void mmc_blk_remove(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
mmc_blk_remove_parts(card, md);
|
|
mmc_claim_host(card->host);
|
|
mmc_blk_part_switch(card, md);
|
|
mmc_release_host(card->host);
|
|
mmc_blk_remove_req(md);
|
|
mmc_set_drvdata(card, NULL);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
|
|
{
|
|
struct mmc_blk_data *part_md;
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
if (md) {
|
|
mmc_queue_suspend(&md->queue);
|
|
list_for_each_entry(part_md, &md->part, part) {
|
|
mmc_queue_suspend(&part_md->queue);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mmc_blk_resume(struct mmc_card *card)
|
|
{
|
|
struct mmc_blk_data *part_md;
|
|
struct mmc_blk_data *md = mmc_get_drvdata(card);
|
|
|
|
if (md) {
|
|
mmc_blk_set_blksize(md, card);
|
|
|
|
/*
|
|
* Resume involves the card going into idle state,
|
|
* so current partition is always the main one.
|
|
*/
|
|
md->part_curr = md->part_type;
|
|
mmc_queue_resume(&md->queue);
|
|
list_for_each_entry(part_md, &md->part, part) {
|
|
mmc_queue_resume(&part_md->queue);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
#define mmc_blk_suspend NULL
|
|
#define mmc_blk_resume NULL
|
|
#endif
|
|
|
|
static struct mmc_driver mmc_driver = {
|
|
.drv = {
|
|
.name = "mmcblk",
|
|
},
|
|
.probe = mmc_blk_probe,
|
|
.remove = mmc_blk_remove,
|
|
.suspend = mmc_blk_suspend,
|
|
.resume = mmc_blk_resume,
|
|
};
|
|
|
|
static int __init mmc_blk_init(void)
|
|
{
|
|
int res;
|
|
|
|
if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
|
|
pr_info("mmcblk: using %d minors per device\n", perdev_minors);
|
|
|
|
max_devices = 256 / perdev_minors;
|
|
|
|
res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
if (res)
|
|
goto out;
|
|
|
|
res = mmc_register_driver(&mmc_driver);
|
|
if (res)
|
|
goto out2;
|
|
|
|
return 0;
|
|
out2:
|
|
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static void __exit mmc_blk_exit(void)
|
|
{
|
|
mmc_unregister_driver(&mmc_driver);
|
|
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
|
|
}
|
|
|
|
module_init(mmc_blk_init);
|
|
module_exit(mmc_blk_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
|
|
|