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M7350/kernel/drivers/mmc/card/block.c

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M7350v1_en_gpl
2024-09-09 08:52:07 +00:00
/*
* Block driver for media (i.e., flash cards)
*
* Copyright 2002 Hewlett-Packard Company
* Copyright 2005-2008 Pierre Ossman
*
* Use consistent with the GNU GPL is permitted,
* provided that this copyright notice is
* preserved in its entirety in all copies and derived works.
*
* HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
* AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
* FITNESS FOR ANY PARTICULAR PURPOSE.
*
* Many thanks to Alessandro Rubini and Jonathan Corbet!
*
* Author: Andrew Christian
* 28 May 2002
*/
#include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <linux/string_helpers.h>
#include <linux/delay.h>
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/pm_runtime.h>
#include <linux/mmc/ioctl.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include <asm/uaccess.h>
#include "queue.h"
MODULE_ALIAS("mmc:block");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "mmcblk."
#define INAND_CMD38_ARG_EXT_CSD 113
#define INAND_CMD38_ARG_ERASE 0x00
#define INAND_CMD38_ARG_TRIM 0x01
#define INAND_CMD38_ARG_SECERASE 0x80
#define INAND_CMD38_ARG_SECTRIM1 0x81
#define INAND_CMD38_ARG_SECTRIM2 0x88
#define MMC_BLK_TIMEOUT_MS (30 * 1000) /* 30 sec timeout */
#define MMC_SANITIZE_REQ_TIMEOUT 240000 /* msec */
#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
(req->cmd_flags & REQ_META)) && \
(rq_data_dir(req) == WRITE))
#define PACKED_CMD_VER 0x01
#define PACKED_CMD_WR 0x02
#define PACKED_TRIGGER_MAX_ELEMENTS 5000
#define MMC_BLK_UPDATE_STOP_REASON(stats, reason) \
do { \
if (stats->enabled) \
stats->pack_stop_reason[reason]++; \
} while (0)
#define PCKD_TRGR_INIT_MEAN_POTEN 17
#define PCKD_TRGR_POTEN_LOWER_BOUND 5
#define PCKD_TRGR_URGENT_PENALTY 2
#define PCKD_TRGR_LOWER_BOUND 5
#define PCKD_TRGR_PRECISION_MULTIPLIER 100
static DEFINE_MUTEX(block_mutex);
/*
* The defaults come from config options but can be overriden by module
* or bootarg options.
*/
static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
/*
* We've only got one major, so number of mmcblk devices is
* limited to 256 / number of minors per device.
*/
static int max_devices;
/* 256 minors, so at most 256 separate devices */
static DECLARE_BITMAP(dev_use, 256);
static DECLARE_BITMAP(name_use, 256);
/*
* There is one mmc_blk_data per slot.
*/
struct mmc_blk_data {
spinlock_t lock;
struct gendisk *disk;
struct mmc_queue queue;
struct list_head part;
unsigned int flags;
#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
unsigned int usage;
unsigned int read_only;
unsigned int part_type;
unsigned int name_idx;
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)
/*
* Only set in main mmc_blk_data associated
* with mmc_card with mmc_set_drvdata, and keeps
* track of the current selected device partition.
*/
unsigned int part_curr;
struct device_attribute force_ro;
struct device_attribute power_ro_lock;
struct device_attribute num_wr_reqs_to_start_packing;
struct device_attribute bkops_check_threshold;
struct device_attribute no_pack_for_random;
int area_type;
};
static DEFINE_MUTEX(open_lock);
enum {
MMC_PACKED_N_IDX = -1,
MMC_PACKED_N_ZERO,
MMC_PACKED_N_SINGLE,
};
module_param(perdev_minors, int, 0444);
MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
static inline int mmc_blk_part_switch(struct mmc_card *card,
struct mmc_blk_data *md);
static int get_card_status(struct mmc_card *card, u32 *status, int retries);
static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
{
mqrq->packed_cmd = MMC_PACKED_NONE;
mqrq->packed_num = MMC_PACKED_N_ZERO;
}
static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
{
struct mmc_blk_data *md;
mutex_lock(&open_lock);
md = disk->private_data;
if (md && md->usage == 0)
md = NULL;
if (md)
md->usage++;
mutex_unlock(&open_lock);
return md;
}
static inline int mmc_get_devidx(struct gendisk *disk)
{
int devidx = disk->first_minor / perdev_minors;
return devidx;
}
static void mmc_blk_put(struct mmc_blk_data *md)
{
mutex_lock(&open_lock);
md->usage--;
if (md->usage == 0) {
int devidx = mmc_get_devidx(md->disk);
blk_cleanup_queue(md->queue.queue);
__clear_bit(devidx, dev_use);
put_disk(md->disk);
kfree(md);
}
mutex_unlock(&open_lock);
}
static ssize_t power_ro_lock_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
struct mmc_card *card = md->queue.card;
int locked = 0;
if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
locked = 2;
else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
locked = 1;
ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
return ret;
}
static ssize_t power_ro_lock_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int ret;
struct mmc_blk_data *md, *part_md;
struct mmc_card *card;
unsigned long set;
if (kstrtoul(buf, 0, &set))
return -EINVAL;
if (set != 1)
return count;
md = mmc_blk_get(dev_to_disk(dev));
card = md->queue.card;
mmc_rpm_hold(card->host, &card->dev);
mmc_claim_host(card->host);
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;
mmc_release_host(card->host);
mmc_rpm_release(card->host, &card->dev);
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;
}
static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int ret;
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
ret = snprintf(buf, PAGE_SIZE, "%d",
get_disk_ro(dev_to_disk(dev)) ^
md->read_only);
mmc_blk_put(md);
return ret;
}
static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
char *end;
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
unsigned long set = simple_strtoul(buf, &end, 0);
if (end == buf) {
ret = -EINVAL;
goto out;
}
set_disk_ro(dev_to_disk(dev), set || md->read_only);
ret = count;
out:
mmc_blk_put(md);
return ret;
}
static ssize_t
num_wr_reqs_to_start_packing_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
int num_wr_reqs_to_start_packing;
int ret;
num_wr_reqs_to_start_packing = md->queue.num_wr_reqs_to_start_packing;
ret = snprintf(buf, PAGE_SIZE, "%d\n", num_wr_reqs_to_start_packing);
mmc_blk_put(md);
return ret;
}
static ssize_t
num_wr_reqs_to_start_packing_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int value;
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
struct mmc_card *card = md->queue.card;
int ret = count;
if (!card) {
ret = -EINVAL;
goto exit;
}
sscanf(buf, "%d", &value);
if (value >= 0) {
md->queue.num_wr_reqs_to_start_packing =
min_t(int, value, (int)card->ext_csd.max_packed_writes);
pr_debug("%s: trigger to pack: new value = %d",
mmc_hostname(card->host),
md->queue.num_wr_reqs_to_start_packing);
} else {
pr_err("%s: value %d is not valid. old value remains = %d",
mmc_hostname(card->host), value,
md->queue.num_wr_reqs_to_start_packing);
ret = -EINVAL;
}
exit:
mmc_blk_put(md);
return ret;
}
static ssize_t
bkops_check_threshold_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
struct mmc_card *card = md->queue.card;
int ret;
if (!card)
ret = -EINVAL;
else
ret = snprintf(buf, PAGE_SIZE, "%d\n",
card->bkops_info.size_percentage_to_queue_delayed_work);
mmc_blk_put(md);
return ret;
}
static ssize_t
bkops_check_threshold_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int value;
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
struct mmc_card *card = md->queue.card;
unsigned int card_size;
int ret = count;
if (!card) {
ret = -EINVAL;
goto exit;
}
sscanf(buf, "%d", &value);
if ((value <= 0) || (value >= 100)) {
ret = -EINVAL;
goto exit;
}
card_size = (unsigned int)get_capacity(md->disk);
if (card_size <= 0) {
ret = -EINVAL;
goto exit;
}
card->bkops_info.size_percentage_to_queue_delayed_work = value;
card->bkops_info.min_sectors_to_queue_delayed_work =
(card_size * value) / 100;
pr_debug("%s: size_percentage = %d, min_sectors = %d",
mmc_hostname(card->host),
card->bkops_info.size_percentage_to_queue_delayed_work,
card->bkops_info.min_sectors_to_queue_delayed_work);
exit:
mmc_blk_put(md);
return count;
}
static ssize_t
no_pack_for_random_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
int ret;
ret = snprintf(buf, PAGE_SIZE, "%d\n", md->queue.no_pack_for_random);
mmc_blk_put(md);
return ret;
}
static ssize_t
no_pack_for_random_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int value;
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
struct mmc_card *card = md->queue.card;
int ret = count;
if (!card) {
ret = -EINVAL;
goto exit;
}
sscanf(buf, "%d", &value);
if (value < 0) {
pr_err("%s: value %d is not valid. old value remains = %d",
mmc_hostname(card->host), value,
md->queue.no_pack_for_random);
ret = -EINVAL;
goto exit;
}
md->queue.no_pack_for_random = (value > 0) ? true : false;
pr_debug("%s: no_pack_for_random: new value = %d",
mmc_hostname(card->host),
md->queue.no_pack_for_random);
exit:
mmc_blk_put(md);
return ret;
}
static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
{
struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
int ret = -ENXIO;
mutex_lock(&block_mutex);
if (md) {
if (md->usage == 2)
check_disk_change(bdev);
ret = 0;
if ((mode & FMODE_WRITE) && md->read_only) {
mmc_blk_put(md);
ret = -EROFS;
}
}
mutex_unlock(&block_mutex);
return ret;
}
static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
{
struct mmc_blk_data *md = disk->private_data;
mutex_lock(&block_mutex);
mmc_blk_put(md);
mutex_unlock(&block_mutex);
return 0;
}
static int
mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
geo->heads = 4;
geo->sectors = 16;
return 0;
}
struct mmc_blk_ioc_data {
struct mmc_ioc_cmd ic;
unsigned char *buf;
u64 buf_bytes;
};
static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
struct mmc_ioc_cmd __user *user)
{
struct mmc_blk_ioc_data *idata;
int err;
idata = kzalloc(sizeof(*idata), GFP_KERNEL);
if (!idata) {
err = -ENOMEM;
goto out;
}
if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
err = -EFAULT;
goto idata_err;
}
idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
err = -EOVERFLOW;
goto idata_err;
}
if (!idata->buf_bytes)
return idata;
idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
if (!idata->buf) {
err = -ENOMEM;
goto idata_err;
}
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);
idata_err:
kfree(idata);
out:
return ERR_PTR(err);
}
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;
}
static int mmc_blk_ioctl_cmd(struct block_device *bdev,
struct mmc_ioc_cmd __user *ic_ptr)
{
struct mmc_blk_ioc_data *idata;
struct mmc_blk_data *md;
struct mmc_card *card;
struct mmc_command cmd = {0};
struct mmc_data data = {0};
struct mmc_request mrq = {NULL};
struct scatterlist sg;
int err;
/*
* The caller must have CAP_SYS_RAWIO, and must be calling this on the
* whole block device, not on a partition. This prevents overspray
* between sibling partitions.
*/
if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
return -EPERM;
idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
if (IS_ERR(idata))
return PTR_ERR(idata);
md = mmc_blk_get(bdev->bd_disk);
if (!md) {
err = -EINVAL;
goto blk_err;
}
card = md->queue.card;
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto cmd_done;
}
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;
mmc_rpm_hold(card->host, &card->dev);
mmc_claim_host(card->host);
err = mmc_blk_part_switch(card, md);
if (err)
goto cmd_rel_host;
if (idata->ic.is_acmd) {
err = mmc_app_cmd(card->host, card);
if (err)
goto cmd_rel_host;
}
mmc_wait_for_req(card->host, &mrq);
if (cmd.error) {
dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
__func__, cmd.error);
err = cmd.error;
goto cmd_rel_host;
}
if (data.error) {
dev_err(mmc_dev(card->host), "%s: data error %d\n",
__func__, data.error);
err = data.error;
goto cmd_rel_host;
}
/*
* According to the SD specs, some commands require a delay after
* issuing the command.
*/
if (idata->ic.postsleep_min_us)
usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
err = -EFAULT;
goto cmd_rel_host;
}
if (!idata->ic.write_flag) {
if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
idata->buf, idata->buf_bytes)) {
err = -EFAULT;
goto cmd_rel_host;
}
}
cmd_rel_host:
mmc_release_host(card->host);
mmc_rpm_release(card->host, &card->dev);
cmd_done:
mmc_blk_put(md);
blk_err:
kfree(idata->buf);
kfree(idata);
return err;
}
struct mmc_blk_ioc_rpmb_data {
struct mmc_blk_ioc_data *data[MMC_IOC_MAX_RPMB_CMD];
};
static struct mmc_blk_ioc_rpmb_data *mmc_blk_ioctl_rpmb_copy_from_user(
struct mmc_ioc_rpmb __user *user)
{
struct mmc_blk_ioc_rpmb_data *idata;
int err, i;
idata = kzalloc(sizeof(*idata), GFP_KERNEL);
if (!idata) {
err = -ENOMEM;
goto out;
}
for (i = 0; i < MMC_IOC_MAX_RPMB_CMD; i++) {
idata->data[i] = mmc_blk_ioctl_copy_from_user(&(user->cmds[i]));
if (IS_ERR(idata->data[i])) {
err = PTR_ERR(idata->data[i]);
goto copy_err;
}
}
return idata;
copy_err:
while (--i >= 0) {
kfree(idata->data[i]->buf);
kfree(idata->data[i]);
}
kfree(idata);
out:
return ERR_PTR(err);
}
static int mmc_blk_ioctl_rpmb_cmd(struct block_device *bdev,
struct mmc_ioc_rpmb __user *ic_ptr)
{
struct mmc_blk_ioc_rpmb_data *idata;
struct mmc_blk_data *md;
struct mmc_card *card;
struct mmc_command cmd = {0};
struct mmc_data data = {0};
struct mmc_request mrq = {NULL};
struct scatterlist sg;
int err = 0, i = 0;
u32 status = 0;
/* The caller must have CAP_SYS_RAWIO */
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
md = mmc_blk_get(bdev->bd_disk);
/* make sure this is a rpmb partition */
if ((!md) || (!(md->area_type & MMC_BLK_DATA_AREA_RPMB))) {
err = -EINVAL;
goto cmd_done;
}
idata = mmc_blk_ioctl_rpmb_copy_from_user(ic_ptr);
if (IS_ERR(idata)) {
err = PTR_ERR(idata);
goto cmd_done;
}
card = md->queue.card;
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto idata_free;
}
mmc_rpm_hold(card->host, &card->dev);
mmc_claim_host(card->host);
err = mmc_blk_part_switch(card, md);
if (err)
goto cmd_rel_host;
for (i = 0; i < MMC_IOC_MAX_RPMB_CMD; i++) {
struct mmc_blk_ioc_data *curr_data;
struct mmc_ioc_cmd *curr_cmd;
curr_data = idata->data[i];
curr_cmd = &curr_data->ic;
if (!curr_cmd->opcode)
break;
cmd.opcode = curr_cmd->opcode;
cmd.arg = curr_cmd->arg;
cmd.flags = curr_cmd->flags;
if (curr_data->buf_bytes) {
data.sg = &sg;
data.sg_len = 1;
data.blksz = curr_cmd->blksz;
data.blocks = curr_cmd->blocks;
sg_init_one(data.sg, curr_data->buf,
curr_data->buf_bytes);
if (curr_cmd->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 (curr_cmd->data_timeout_ns)
data.timeout_ns = curr_cmd->data_timeout_ns;
mrq.data = &data;
}
mrq.cmd = &cmd;
err = mmc_set_blockcount(card, data.blocks,
curr_cmd->write_flag & (1 << 31));
if (err)
goto cmd_rel_host;
mmc_wait_for_req(card->host, &mrq);
if (cmd.error) {
dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
__func__, cmd.error);
err = cmd.error;
goto cmd_rel_host;
}
if (data.error) {
dev_err(mmc_dev(card->host), "%s: data error %d\n",
__func__, data.error);
err = data.error;
goto cmd_rel_host;
}
if (copy_to_user(&(ic_ptr->cmds[i].response), cmd.resp,
sizeof(cmd.resp))) {
err = -EFAULT;
goto cmd_rel_host;
}
if (!curr_cmd->write_flag) {
if (copy_to_user((void __user *)(unsigned long)
curr_cmd->data_ptr,
curr_data->buf,
curr_data->buf_bytes)) {
err = -EFAULT;
goto cmd_rel_host;
}
}
/*
* 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);
}
cmd_rel_host:
mmc_release_host(card->host);
mmc_rpm_release(card->host, &card->dev);
idata_free:
for (i = 0; i < MMC_IOC_MAX_RPMB_CMD; i++) {
kfree(idata->data[i]->buf);
kfree(idata->data[i]);
}
kfree(idata);
cmd_done:
mmc_blk_put(md);
return err;
}
static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
int ret = -EINVAL;
if (cmd == MMC_IOC_CMD)
ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
if (cmd == MMC_IOC_RPMB_CMD)
ret = mmc_blk_ioctl_rpmb_cmd(bdev,
(struct mmc_ioc_rpmb __user *)arg);
return ret;
}
#ifdef CONFIG_COMPAT
static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
}
#endif
static const struct block_device_operations mmc_bdops = {
.open = mmc_blk_open,
.release = mmc_blk_release,
.getgeo = mmc_blk_getgeo,
.owner = THIS_MODULE,
.ioctl = mmc_blk_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = mmc_blk_compat_ioctl,
#endif
};
static inline int mmc_blk_part_switch(struct mmc_card *card,
struct mmc_blk_data *md)
{
int ret;
struct mmc_blk_data *main_md = mmc_get_drvdata(card);
if ((main_md->part_curr == md->part_type) &&
(card->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;
card->part_curr = md->part_type;
}
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};
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.blksz = 4;
data.blocks = 1;
data.flags = MMC_DATA_READ;
data.sg = &sg;
data.sg_len = 1;
mmc_set_data_timeout(&data, card);
mrq.cmd = &cmd;
mrq.data = &data;
blocks = kmalloc(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_NOMEDIUM 3
#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) {
pr_err("%s: status not valid, retrying timeout\n", req->rq_disk->disk_name);
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)) {
pr_err("%s: command error, retrying timeout\n", req->rq_disk->disk_name);
return ERR_RETRY;
}
/* Otherwise abort the command */
pr_err("%s: not retrying timeout\n", req->rq_disk->disk_name);
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;
if (mmc_card_removed(card))
return ERR_NOMEDIUM;
/*
* 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) {
/* Check if the card is removed */
if (mmc_detect_card_removed(card->host))
return ERR_NOMEDIUM;
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 (card->ext_csd.bkops_en)
card->bkops_info.sectors_changed += 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);
blk_end_request(req, err, blk_rq_bytes(req));
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))) {
err = -EOPNOTSUPP;
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_retry;
}
err = mmc_erase(card, from, nr, arg);
if (err == -EIO)
goto out_retry;
if (err)
goto out;
if (arg == MMC_SECURE_TRIM1_ARG) {
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
INAND_CMD38_ARG_EXT_CSD,
INAND_CMD38_ARG_SECTRIM2,
0);
if (err)
goto out_retry;
}
err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
if (err == -EIO)
goto out_retry;
if (err)
goto out;
}
out_retry:
if (err && !mmc_blk_reset(md, card->host, type))
goto retry;
if (!err)
mmc_blk_reset_success(md, type);
out:
blk_end_request(req, err, blk_rq_bytes(req));
return err ? 0 : 1;
}
static int mmc_blk_issue_sanitize_rq(struct mmc_queue *mq,
struct request *req)
{
struct mmc_blk_data *md = mq->data;
struct mmc_card *card = md->queue.card;
int err = 0;
BUG_ON(!card);
BUG_ON(!card->host);
if (!(mmc_can_sanitize(card) &&
(card->host->caps2 & MMC_CAP2_SANITIZE))) {
pr_warning("%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 - mmc_switch() with "
"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:
blk_end_request(req, err, blk_rq_bytes(req));
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;
blk_end_request_all(req, ret);
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_NOMEDIUM:
return MMC_BLK_NOMEDIUM;
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;
unsigned long timeout;
timeout = jiffies + msecs_to_jiffies(MMC_BLK_TIMEOUT_MS);
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;
}
/* 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 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 (mq_mrq->packed_cmd != MMC_PACKED_NONE) {
if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
return MMC_BLK_PARTIAL;
else
return MMC_BLK_SUCCESS;
}
if (blk_rq_bytes(req) != brq->data.bytes_xfered)
return MMC_BLK_PARTIAL;
return MMC_BLK_SUCCESS;
}
/*
* mmc_blk_reinsert_req() - re-insert request back to the scheduler
* @areq: request to re-insert.
*
* Request may be packed or single. When fails to reinsert request, it will be
* requeued to the the dispatch queue.
*/
static void mmc_blk_reinsert_req(struct mmc_async_req *areq)
{
struct request *prq;
int ret = 0;
struct mmc_queue_req *mq_rq;
struct request_queue *q;
mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
q = mq_rq->req->q;
if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
while (!list_empty(&mq_rq->packed_list)) {
/* return requests in reverse order */
prq = list_entry_rq(mq_rq->packed_list.prev);
list_del_init(&prq->queuelist);
spin_lock_irq(q->queue_lock);
ret = blk_reinsert_request(q, prq);
if (ret) {
blk_requeue_request(q, prq);
spin_unlock_irq(q->queue_lock);
goto reinsert_error;
}
spin_unlock_irq(q->queue_lock);
}
} else {
spin_lock_irq(q->queue_lock);
ret = blk_reinsert_request(q, mq_rq->req);
if (ret)
blk_requeue_request(q, mq_rq->req);
spin_unlock_irq(q->queue_lock);
}
return;
reinsert_error:
pr_err("%s: blk_reinsert_request() failed (%d)",
mq_rq->req->rq_disk->disk_name, ret);
/*
* -EIO will be reported for this request and rest of packed_list.
* Urgent request will be proceeded anyway, while upper layer
* responsibility to re-send failed requests
*/
while (!list_empty(&mq_rq->packed_list)) {
prq = list_entry_rq(mq_rq->packed_list.next);
list_del_init(&prq->queuelist);
spin_lock_irq(q->queue_lock);
blk_requeue_request(q, prq);
spin_unlock_irq(q->queue_lock);
}
}
/*
* mmc_blk_update_interrupted_req() - update of the stopped request
* @card: the MMC card associated with the request.
* @areq: interrupted async request.
*
* Get stopped request state from card and update successfully done part of
* the request by setting packed_fail_idx. The packed_fail_idx is index of
* first uncompleted request in packed request list, for non-packed request
* packed_fail_idx remains unchanged.
*
* Returns: MMC_BLK_SUCCESS for success, MMC_BLK_ABORT otherwise
*/
static int mmc_blk_update_interrupted_req(struct mmc_card *card,
struct mmc_async_req *areq)
{
int ret = MMC_BLK_SUCCESS;
u8 *ext_csd;
int correctly_done;
struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
mmc_active);
struct request *prq;
u8 req_index = 0;
if (mq_rq->packed_cmd == MMC_PACKED_NONE)
return MMC_BLK_SUCCESS;
ext_csd = kmalloc(512, GFP_KERNEL);
if (!ext_csd)
return MMC_BLK_ABORT;
/* get correctly programmed sectors number from card */
ret = mmc_send_ext_csd(card, ext_csd);
if (ret) {
pr_err("%s: error %d reading ext_csd\n",
mmc_hostname(card->host), ret);
ret = MMC_BLK_ABORT;
goto exit;
}
correctly_done = card->ext_csd.data_sector_size *
(ext_csd[EXT_CSD_CORRECTLY_PRG_SECTORS_NUM + 0] << 0 |
ext_csd[EXT_CSD_CORRECTLY_PRG_SECTORS_NUM + 1] << 8 |
ext_csd[EXT_CSD_CORRECTLY_PRG_SECTORS_NUM + 2] << 16 |
ext_csd[EXT_CSD_CORRECTLY_PRG_SECTORS_NUM + 3] << 24);
list_for_each_entry(prq, &mq_rq->packed_list, queuelist) {
if ((correctly_done - (int)blk_rq_bytes(prq)) < 0) {
/* prq is not successfull */
mq_rq->packed_fail_idx = req_index;
break;
}
correctly_done -= blk_rq_bytes(prq);
req_index++;
}
exit:
kfree(ext_csd);
return ret;
}
static int mmc_blk_packed_err_check(struct mmc_card *card,
struct mmc_async_req *areq)
{
struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
mmc_active);
struct request *req = mq_rq->req;
int err, check, status;
u8 ext_csd[512];
mq_rq->packed_retries--;
check = mmc_blk_err_check(card, areq);
err = get_card_status(card, &status, 0);
if (err) {
pr_err("%s: error %d sending status command\n",
req->rq_disk->disk_name, err);
return MMC_BLK_ABORT;
}
if (status & R1_EXCEPTION_EVENT) {
err = mmc_send_ext_csd(card, ext_csd);
if (err) {
pr_err("%s: error %d sending ext_csd\n",
req->rq_disk->disk_name, err);
return MMC_BLK_ABORT;
}
if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
EXT_CSD_PACKED_FAILURE) &&
(ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
EXT_CSD_PACKED_GENERIC_ERROR)) {
if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
EXT_CSD_PACKED_INDEXED_ERROR) {
mq_rq->packed_fail_idx =
ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
return MMC_BLK_PARTIAL;
}
}
}
return check;
}
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;
bool do_data_tag;
/*
* 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);
brq->data.fault_injected = false;
/*
* 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);
/*
* 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);
/*
* Pre-defined multi-block transfers are preferable to
* open ended-ones (and necessary for reliable writes).
* However, it is not sufficient to just send CMD23,
* and avoid the final CMD12, as on an error condition
* CMD12 (stop) needs to be sent anyway. This, coupled
* with Auto-CMD23 enhancements provided by some
* hosts, means that the complexity of dealing
* with this is best left to the host. If CMD23 is
* supported by card and host, we'll fill sbc in and let
* the host deal with handling it correctly. This means
* that for hosts that don't expose MMC_CAP_CMD23, no
* change of behavior will be observed.
*
* N.B: Some MMC cards experience perf degradation.
* We'll avoid using CMD23-bounded multiblock writes for
* these, while retaining features like reliable writes.
*/
if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
(do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
do_data_tag)) {
brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
brq->sbc.arg = brq->data.blocks |
(do_rel_wr ? (1 << 31) : 0) |
(do_data_tag ? (1 << 29) : 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.cmd_flags = req->cmd_flags;
if (mq->err_check_fn)
mqrq->mmc_active.err_check = mq->err_check_fn;
else
mqrq->mmc_active.err_check = mmc_blk_err_check;
mqrq->mmc_active.reinsert_req = mmc_blk_reinsert_req;
mqrq->mmc_active.update_interrupted_req =
mmc_blk_update_interrupted_req;
mmc_queue_bounce_pre(mqrq);
}
/**
* mmc_blk_disable_wr_packing() - disables packing mode
* @mq: MMC queue.
*
*/
void mmc_blk_disable_wr_packing(struct mmc_queue *mq)
{
if (mq) {
mq->wr_packing_enabled = false;
mq->num_of_potential_packed_wr_reqs = 0;
}
}
EXPORT_SYMBOL(mmc_blk_disable_wr_packing);
static int get_packed_trigger(int potential, struct mmc_card *card,
struct request *req, int curr_trigger)
{
static int num_mean_elements = 1;
static unsigned long mean_potential = PCKD_TRGR_INIT_MEAN_POTEN;
unsigned int trigger = curr_trigger;
unsigned int pckd_trgr_upper_bound = card->ext_csd.max_packed_writes;
/* scale down the upper bound to 75% */
pckd_trgr_upper_bound = (pckd_trgr_upper_bound * 3) / 4;
/*
* since the most common calls for this function are with small
* potential write values and since we don't want these calls to affect
* the packed trigger, set a lower bound and ignore calls with
* potential lower than that bound
*/
if (potential <= PCKD_TRGR_POTEN_LOWER_BOUND)
return trigger;
/*
* this is to prevent integer overflow in the following calculation:
* once every PACKED_TRIGGER_MAX_ELEMENTS reset the algorithm
*/
if (num_mean_elements > PACKED_TRIGGER_MAX_ELEMENTS) {
num_mean_elements = 1;
mean_potential = PCKD_TRGR_INIT_MEAN_POTEN;
}
/*
* get next mean value based on previous mean value and current
* potential packed writes. Calculation is as follows:
* mean_pot[i+1] =
* ((mean_pot[i] * num_mean_elem) + potential)/(num_mean_elem + 1)
*/
mean_potential *= num_mean_elements;
/*
* add num_mean_elements so that the division of two integers doesn't
* lower mean_potential too much
*/
if (potential > mean_potential)
mean_potential += num_mean_elements;
mean_potential += potential;
/* this is for gaining more precision when dividing two integers */
mean_potential *= PCKD_TRGR_PRECISION_MULTIPLIER;
/* this completes the mean calculation */
mean_potential /= ++num_mean_elements;
mean_potential /= PCKD_TRGR_PRECISION_MULTIPLIER;
/*
* if current potential packed writes is greater than the mean potential
* then the heuristic is that the following workload will contain many
* write requests, therefore we lower the packed trigger. In the
* opposite case we want to increase the trigger in order to get less
* packing events.
*/
if (potential >= mean_potential)
trigger = (trigger <= PCKD_TRGR_LOWER_BOUND) ?
PCKD_TRGR_LOWER_BOUND : trigger - 1;
else
trigger = (trigger >= pckd_trgr_upper_bound) ?
pckd_trgr_upper_bound : trigger + 1;
/*
* an urgent read request indicates a packed list being interrupted
* by this read, therefore we aim for less packing, hence the trigger
* gets increased
*/
if (req && (req->cmd_flags & REQ_URGENT) && (rq_data_dir(req) == READ))
trigger += PCKD_TRGR_URGENT_PENALTY;
return trigger;
}
static void mmc_blk_write_packing_control(struct mmc_queue *mq,
struct request *req)
{
struct mmc_host *host = mq->card->host;
int data_dir;
if (!(host->caps2 & MMC_CAP2_PACKED_WR))
return;
/* Support for the write packing on eMMC 4.5 or later */
if (mq->card->ext_csd.rev <= 5)
return;
/*
* In case the packing control is not supported by the host, it should
* not have an effect on the write packing. Therefore we have to enable
* the write packing
*/
if (!(host->caps2 & MMC_CAP2_PACKED_WR_CONTROL)) {
mq->wr_packing_enabled = true;
return;
}
if (!req || (req && (req->cmd_flags & REQ_FLUSH))) {
if (mq->num_of_potential_packed_wr_reqs >
mq->num_wr_reqs_to_start_packing)
mq->wr_packing_enabled = true;
mq->num_wr_reqs_to_start_packing =
get_packed_trigger(mq->num_of_potential_packed_wr_reqs,
mq->card, req,
mq->num_wr_reqs_to_start_packing);
mq->num_of_potential_packed_wr_reqs = 0;
return;
}
data_dir = rq_data_dir(req);
if (data_dir == READ) {
mmc_blk_disable_wr_packing(mq);
mq->num_wr_reqs_to_start_packing =
get_packed_trigger(mq->num_of_potential_packed_wr_reqs,
mq->card, req,
mq->num_wr_reqs_to_start_packing);
mq->num_of_potential_packed_wr_reqs = 0;
mq->wr_packing_enabled = false;
return;
} else if (data_dir == WRITE) {
mq->num_of_potential_packed_wr_reqs++;
}
if (mq->num_of_potential_packed_wr_reqs >
mq->num_wr_reqs_to_start_packing)
mq->wr_packing_enabled = true;
}
struct mmc_wr_pack_stats *mmc_blk_get_packed_statistics(struct mmc_card *card)
{
if (!card)
return NULL;
return &card->wr_pack_stats;
}
EXPORT_SYMBOL(mmc_blk_get_packed_statistics);
void mmc_blk_init_packed_statistics(struct mmc_card *card)
{
int max_num_of_packed_reqs = 0;
if (!card || !card->wr_pack_stats.packing_events)
return;
max_num_of_packed_reqs = card->ext_csd.max_packed_writes;
spin_lock(&card->wr_pack_stats.lock);
memset(card->wr_pack_stats.packing_events, 0,
(max_num_of_packed_reqs + 1) *
sizeof(*card->wr_pack_stats.packing_events));
memset(&card->wr_pack_stats.pack_stop_reason, 0,
sizeof(card->wr_pack_stats.pack_stop_reason));
card->wr_pack_stats.enabled = true;
spin_unlock(&card->wr_pack_stats.lock);
}
EXPORT_SYMBOL(mmc_blk_init_packed_statistics);
static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
{
struct request_queue *q = mq->queue;
struct mmc_card *card = mq->card;
struct request *cur = req, *next = NULL;
struct mmc_blk_data *md = mq->data;
bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
unsigned int req_sectors = 0, phys_segments = 0;
unsigned int max_blk_count, max_phys_segs;
u8 put_back = 0;
u8 max_packed_rw = 0;
u8 reqs = 0;
struct mmc_wr_pack_stats *stats = &card->wr_pack_stats;
mmc_blk_clear_packed(mq->mqrq_cur);
if (!(md->flags & MMC_BLK_CMD23) ||
!card->ext_csd.packed_event_en)
goto no_packed;
if (!mq->wr_packing_enabled)
goto no_packed;
if ((rq_data_dir(cur) == WRITE) &&
(card->host->caps2 & MMC_CAP2_PACKED_WR))
max_packed_rw = card->ext_csd.max_packed_writes;
if (max_packed_rw == 0)
goto no_packed;
if (mmc_req_rel_wr(cur) &&
(md->flags & MMC_BLK_REL_WR) &&
!en_rel_wr)
goto no_packed;
if (mmc_large_sec(card) &&
!IS_ALIGNED(blk_rq_sectors(cur), 8))
goto no_packed;
if (cur->cmd_flags & REQ_FUA)
goto no_packed;
max_blk_count = min(card->host->max_blk_count,
card->host->max_req_size >> 9);
if (unlikely(max_blk_count > 0xffff))
max_blk_count = 0xffff;
max_phys_segs = queue_max_segments(q);
req_sectors += blk_rq_sectors(cur);
phys_segments += cur->nr_phys_segments;
if (rq_data_dir(cur) == WRITE) {
req_sectors++;
phys_segments++;
}
spin_lock(&stats->lock);
while (reqs < max_packed_rw - 1) {
spin_lock_irq(q->queue_lock);
next = blk_fetch_request(q);
spin_unlock_irq(q->queue_lock);
if (!next) {
MMC_BLK_UPDATE_STOP_REASON(stats, EMPTY_QUEUE);
break;
}
if (mmc_large_sec(card) &&
!IS_ALIGNED(blk_rq_sectors(next), 8)) {
MMC_BLK_UPDATE_STOP_REASON(stats, LARGE_SEC_ALIGN);
put_back = 1;
break;
}
if (next->cmd_flags & REQ_DISCARD ||
next->cmd_flags & REQ_FLUSH) {
MMC_BLK_UPDATE_STOP_REASON(stats, FLUSH_OR_DISCARD);
put_back = 1;
break;
}
if (next->cmd_flags & REQ_FUA) {
MMC_BLK_UPDATE_STOP_REASON(stats, FUA);
put_back = 1;
break;
}
if (rq_data_dir(cur) != rq_data_dir(next)) {
MMC_BLK_UPDATE_STOP_REASON(stats, WRONG_DATA_DIR);
put_back = 1;
break;
}
if (mmc_req_rel_wr(next) &&
(md->flags & MMC_BLK_REL_WR) &&
!en_rel_wr) {
MMC_BLK_UPDATE_STOP_REASON(stats, REL_WRITE);
put_back = 1;
break;
}
req_sectors += blk_rq_sectors(next);
if (req_sectors > max_blk_count) {
if (stats->enabled)
stats->pack_stop_reason[EXCEEDS_SECTORS]++;
put_back = 1;
break;
}
phys_segments += next->nr_phys_segments;
if (phys_segments > max_phys_segs) {
MMC_BLK_UPDATE_STOP_REASON(stats, EXCEEDS_SEGMENTS);
put_back = 1;
break;
}
if (mq->no_pack_for_random) {
if ((blk_rq_pos(cur) + blk_rq_sectors(cur)) !=
blk_rq_pos(next)) {
MMC_BLK_UPDATE_STOP_REASON(stats, RANDOM);
put_back = 1;
break;
}
}
if (rq_data_dir(next) == WRITE) {
mq->num_of_potential_packed_wr_reqs++;
if (card->ext_csd.bkops_en)
card->bkops_info.sectors_changed +=
blk_rq_sectors(next);
}
list_add_tail(&next->queuelist, &mq->mqrq_cur->packed_list);
cur = next;
reqs++;
}
if (put_back) {
spin_lock_irq(q->queue_lock);
blk_requeue_request(q, next);
spin_unlock_irq(q->queue_lock);
}
if (stats->enabled) {
if (reqs + 1 <= card->ext_csd.max_packed_writes)
stats->packing_events[reqs + 1]++;
if (reqs + 1 == max_packed_rw)
MMC_BLK_UPDATE_STOP_REASON(stats, THRESHOLD);
}
spin_unlock(&stats->lock);
if (reqs > 0) {
list_add(&req->queuelist, &mq->mqrq_cur->packed_list);
mq->mqrq_cur->packed_num = ++reqs;
mq->mqrq_cur->packed_retries = reqs;
return reqs;
}
no_packed:
mmc_blk_clear_packed(mq->mqrq_cur);
return 0;
}
static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
struct mmc_card *card,
struct mmc_queue *mq)
{
struct mmc_blk_request *brq = &mqrq->brq;
struct request *req = mqrq->req;
struct request *prq;
struct mmc_blk_data *md = mq->data;
bool do_rel_wr, do_data_tag;
u32 *packed_cmd_hdr = mqrq->packed_cmd_hdr;
u8 i = 1;
mqrq->packed_cmd = MMC_PACKED_WRITE;
mqrq->packed_blocks = 0;
mqrq->packed_fail_idx = MMC_PACKED_N_IDX;
memset(packed_cmd_hdr, 0, sizeof(mqrq->packed_cmd_hdr));
packed_cmd_hdr[0] = (mqrq->packed_num << 16) |
(PACKED_CMD_WR << 8) | PACKED_CMD_VER;
/*
* Argument for each entry of packed group
*/
list_for_each_entry(prq, &mqrq->packed_list, queuelist) {
do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
do_data_tag = (card->ext_csd.data_tag_unit_size) &&
(prq->cmd_flags & REQ_META) &&
(rq_data_dir(prq) == WRITE) &&
((brq->data.blocks * brq->data.blksz) >=
card->ext_csd.data_tag_unit_size);
/* Argument of CMD23 */
packed_cmd_hdr[(i * 2)] =
(do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
(do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
blk_rq_sectors(prq);
/* Argument of CMD18 or CMD25 */
packed_cmd_hdr[((i * 2)) + 1] =
mmc_card_blockaddr(card) ?
blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
mqrq->packed_blocks += blk_rq_sectors(prq);
i++;
}
memset(brq, 0, sizeof(struct mmc_blk_request));
brq->mrq.cmd = &brq->cmd;
brq->mrq.data = &brq->data;
brq->mrq.sbc = &brq->sbc;
brq->mrq.stop = &brq->stop;
brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
brq->sbc.arg = MMC_CMD23_ARG_PACKED | (mqrq->packed_blocks + 1);
brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
brq->cmd.arg = blk_rq_pos(req);
if (!mmc_card_blockaddr(card))
brq->cmd.arg <<= 9;
brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
brq->data.blksz = 512;
brq->data.blocks = mqrq->packed_blocks + 1;
brq->data.flags |= MMC_DATA_WRITE;
brq->data.fault_injected = false;
brq->stop.opcode = MMC_STOP_TRANSMISSION;
brq->stop.arg = 0;
brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
mmc_set_data_timeout(&brq->data, card);
brq->data.sg = mqrq->sg;
brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
mqrq->mmc_active.mrq = &brq->mrq;
mqrq->mmc_active.cmd_flags = req->cmd_flags;
/*
* This is intended for packed commands tests usage - in case these
* functions are not in use the respective pointers are NULL
*/
if (mq->err_check_fn)
mqrq->mmc_active.err_check = mq->err_check_fn;
else
mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
if (mq->packed_test_fn)
mq->packed_test_fn(mq->queue, mqrq);
mqrq->mmc_active.reinsert_req = mmc_blk_reinsert_req;
mqrq->mmc_active.update_interrupted_req =
mmc_blk_update_interrupted_req;
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)
{
struct mmc_queue_req *mq_rq;
mq_rq = container_of(brq, struct mmc_queue_req, brq);
/*
* 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;
if (!brq->data.fault_injected) {
blocks = mmc_sd_num_wr_blocks(card);
if (blocks != (u32)-1)
ret = blk_end_request(req, 0, blocks << 9);
} else
ret = blk_end_request(req, 0, brq->data.bytes_xfered);
} else {
if (mq_rq->packed_cmd == MMC_PACKED_NONE)
ret = blk_end_request(req, 0, brq->data.bytes_xfered);
}
return ret;
}
static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
{
struct request *prq;
int idx = mq_rq->packed_fail_idx, i = 0;
int ret = 0;
while (!list_empty(&mq_rq->packed_list)) {
prq = list_entry_rq(mq_rq->packed_list.next);
if (idx == i) {
/* retry from error index */
mq_rq->packed_num -= idx;
mq_rq->req = prq;
ret = 1;
if (mq_rq->packed_num == MMC_PACKED_N_SINGLE) {
list_del_init(&prq->queuelist);
mmc_blk_clear_packed(mq_rq);
}
return ret;
}
list_del_init(&prq->queuelist);
blk_end_request(prq, 0, blk_rq_bytes(prq));
i++;
}
mmc_blk_clear_packed(mq_rq);
return ret;
}
static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq,
unsigned int cmd_flags)
{
struct request *prq;
while (!list_empty(&mq_rq->packed_list)) {
prq = list_entry_rq(mq_rq->packed_list.next);
list_del_init(&prq->queuelist);
prq->cmd_flags |= cmd_flags;
blk_end_request(prq, -EIO, blk_rq_bytes(prq));
}
mmc_blk_clear_packed(mq_rq);
}
static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
struct mmc_queue_req *mq_rq)
{
struct request *prq;
struct request_queue *q = mq->queue;
while (!list_empty(&mq_rq->packed_list)) {
prq = list_entry_rq(mq_rq->packed_list.prev);
if (prq->queuelist.prev != &mq_rq->packed_list) {
list_del_init(&prq->queuelist);
spin_lock_irq(q->queue_lock);
blk_requeue_request(mq->queue, prq);
spin_unlock_irq(q->queue_lock);
} else {
list_del_init(&prq->queuelist);
}
}
mmc_blk_clear_packed(mq_rq);
}
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;
const u8 packed_num = 2;
u8 reqs = 0;
if (!rqc && !mq->mqrq_prev->req)
return 0;
if (rqc) {
if ((card->ext_csd.bkops_en) && (rq_data_dir(rqc) == WRITE))
card->bkops_info.sectors_changed += blk_rq_sectors(rqc);
reqs = mmc_blk_prep_packed_list(mq, rqc);
}
do {
if (rqc) {
if (reqs >= packed_num)
mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
card, mq);
else
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) {
if (status == MMC_BLK_NEW_REQUEST)
mq->flags |= MMC_QUEUE_NEW_REQUEST;
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_URGENT:
if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
/* complete successfully transmitted part */
if (mmc_blk_end_packed_req(mq_rq))
/* process for not transmitted part */
mmc_blk_reinsert_req(areq);
} else {
mmc_blk_reinsert_req(areq);
}
mq->flags |= MMC_QUEUE_URGENT_REQUEST;
ret = 0;
break;
case MMC_BLK_URGENT_DONE:
case MMC_BLK_SUCCESS:
case MMC_BLK_PARTIAL:
/*
* A block was successfully transferred.
*/
mmc_blk_reset_success(md, type);
if (mq_rq->packed_cmd != MMC_PACKED_NONE) {
ret = mmc_blk_end_packed_req(mq_rq);
break;
} else {
ret = blk_end_request(req, 0,
brq->data.bytes_xfered);
}
/*
* 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 ||
mq_rq->packed_cmd != MMC_PACKED_NONE)
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.
*/
ret = blk_end_request(req, -EIO,
brq->data.blksz);
if (!ret)
goto start_new_req;
break;
case MMC_BLK_NOMEDIUM:
goto cmd_abort;
default:
pr_err("%s:%s: Unhandled return value (%d)",
req->rq_disk->disk_name,
__func__, status);
goto cmd_abort;
}
if (ret) {
if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
/*
* 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);
} else {
if (!mq_rq->packed_retries)
goto cmd_abort;
mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
mmc_start_req(card->host,
&mq_rq->mmc_active, NULL);
}
}
} while (ret);
return 1;
cmd_abort:
if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
if (mmc_card_removed(card))
req->cmd_flags |= REQ_QUIET;
while (ret)
ret = blk_end_request(req, -EIO,
blk_rq_cur_bytes(req));
} else {
mmc_blk_abort_packed_req(mq_rq, 0);
}
start_new_req:
if (rqc) {
if (mmc_card_removed(card)) {
if (mq_rq->packed_cmd == MMC_PACKED_NONE) {
rqc->cmd_flags |= REQ_QUIET;
blk_end_request_all(rqc, -EIO);
} else {
mmc_blk_abort_packed_req(mq_rq, REQ_QUIET);
}
} else {
/* If current request is packed, it needs to put back */
if (mq_rq->packed_cmd != MMC_PACKED_NONE)
mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
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;
struct mmc_host *host = card->host;
unsigned long flags;
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
if (mmc_bus_needs_resume(card->host)) {
mmc_resume_bus(card->host);
mmc_blk_set_blksize(md, card);
}
#endif
if (req && !mq->mqrq_prev->req) {
mmc_rpm_hold(host, &card->dev);
/* claim host only for the first request */
mmc_claim_host(card->host);
if (card->ext_csd.bkops_en)
mmc_stop_bkops(card);
}
ret = mmc_blk_part_switch(card, md);
if (ret) {
if (req) {
blk_end_request_all(req, -EIO);
}
ret = 0;
goto out;
}
mmc_blk_write_packing_control(mq, req);
mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
mq->flags &= ~MMC_QUEUE_URGENT_REQUEST;
if (req && req->cmd_flags & REQ_SANITIZE) {
/* complete ongoing async transfer before issuing sanitize */
if (card->host && card->host->areq)
mmc_blk_issue_rw_rq(mq, NULL);
ret = mmc_blk_issue_sanitize_rq(mq, req);
} else 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 &&
!(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
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 {
if (!req && host->areq) {
spin_lock_irqsave(&host->context_info.lock, flags);
host->context_info.is_waiting_last_req = true;
spin_unlock_irqrestore(&host->context_info.lock, flags);
}
ret = mmc_blk_issue_rw_rq(mq, req);
}
out:
/*
* packet burst is over, when one of the following occurs:
* - no more requests and new request notification is not in progress
* - urgent notification in progress and current request is not urgent
* (all existing requests completed or reinserted to the block layer)
*/
if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
((mq->flags & MMC_QUEUE_URGENT_REQUEST) &&
!(mq->mqrq_cur->req->cmd_flags & REQ_URGENT))) {
if (mmc_card_need_bkops(card))
mmc_start_bkops(card, false);
/* release host only when there are no more requests */
mmc_release_host(card->host);
mmc_rpm_release(host, &card->dev);
}
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,
int area_type)
{
struct mmc_blk_data *md;
int devidx, ret;
unsigned int percentage =
BKOPS_SIZE_PERCENTAGE_TO_QUEUE_DELAYED_WORK;
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;
md->area_type = area_type;
/*
* Set the read-only status based on the supported commands
* and the write protect switch.
*/
md->read_only = mmc_blk_readonly(card);
md->disk = alloc_disk(perdev_minors);
if (md->disk == NULL) {
ret = -ENOMEM;
goto err_kfree;
}
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);
md->disk->flags = GENHD_FL_EXT_DEVT;
if (area_type & MMC_BLK_DATA_AREA_RPMB)
md->disk->flags |= GENHD_FL_NO_PART_SCAN;
/*
* 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);
card->bkops_info.size_percentage_to_queue_delayed_work = percentage;
card->bkops_info.min_sectors_to_queue_delayed_work =
((unsigned int)size * percentage) / 100;
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,
MMC_BLK_DATA_AREA_MAIN);
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,
int area_type)
{
char cap_str[10];
struct mmc_blk_data *part_md;
part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
subname, area_type);
if (IS_ERR(part_md))
return PTR_ERR(part_md);
part_md->part_type = part_type;
list_add(&part_md->part, &md->part);
string_get_size((u64)get_capacity(part_md->disk) << 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,
card->part[idx].area_type);
if (ret)
return ret;
}
}
return ret;
}
static void mmc_blk_remove_req(struct mmc_blk_data *md)
{
struct mmc_card *card;
if (md) {
card = md->queue.card;
device_remove_file(disk_to_dev(md->disk),
&md->num_wr_reqs_to_start_packing);
if (md->disk->flags & GENHD_FL_UP) {
device_remove_file(disk_to_dev(md->disk), &md->force_ro);
if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
card->ext_csd.boot_ro_lockable)
device_remove_file(disk_to_dev(md->disk),
&md->power_ro_lock);
/* 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;
struct mmc_card *card = md->queue.card;
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)
goto force_ro_fail;
if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
card->ext_csd.boot_ro_lockable) {
umode_t mode;
if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
mode = S_IRUGO;
else
mode = S_IRUGO | S_IWUSR;
md->power_ro_lock.show = power_ro_lock_show;
md->power_ro_lock.store = power_ro_lock_store;
sysfs_attr_init(&md->power_ro_lock.attr);
md->power_ro_lock.attr.mode = mode;
md->power_ro_lock.attr.name =
"ro_lock_until_next_power_on";
ret = device_create_file(disk_to_dev(md->disk),
&md->power_ro_lock);
if (ret)
goto power_ro_lock_fail;
}
md->num_wr_reqs_to_start_packing.show =
num_wr_reqs_to_start_packing_show;
md->num_wr_reqs_to_start_packing.store =
num_wr_reqs_to_start_packing_store;
sysfs_attr_init(&md->num_wr_reqs_to_start_packing.attr);
md->num_wr_reqs_to_start_packing.attr.name =
"num_wr_reqs_to_start_packing";
md->num_wr_reqs_to_start_packing.attr.mode = S_IRUGO | S_IWUSR;
ret = device_create_file(disk_to_dev(md->disk),
&md->num_wr_reqs_to_start_packing);
if (ret)
goto num_wr_reqs_to_start_packing_fail;
md->bkops_check_threshold.show = bkops_check_threshold_show;
md->bkops_check_threshold.store = bkops_check_threshold_store;
sysfs_attr_init(&md->bkops_check_threshold.attr);
md->bkops_check_threshold.attr.name = "bkops_check_threshold";
md->bkops_check_threshold.attr.mode = S_IRUGO | S_IWUSR;
ret = device_create_file(disk_to_dev(md->disk),
&md->bkops_check_threshold);
if (ret)
goto bkops_check_threshold_fails;
md->no_pack_for_random.show = no_pack_for_random_show;
md->no_pack_for_random.store = no_pack_for_random_store;
sysfs_attr_init(&md->no_pack_for_random.attr);
md->no_pack_for_random.attr.name = "no_pack_for_random";
md->no_pack_for_random.attr.mode = S_IRUGO | S_IWUSR;
ret = device_create_file(disk_to_dev(md->disk),
&md->no_pack_for_random);
if (ret)
goto no_pack_for_random_fails;
return ret;
no_pack_for_random_fails:
device_remove_file(disk_to_dev(md->disk),
&md->bkops_check_threshold);
bkops_check_threshold_fails:
device_remove_file(disk_to_dev(md->disk),
&md->num_wr_reqs_to_start_packing);
num_wr_reqs_to_start_packing_fail:
device_remove_file(disk_to_dev(md->disk), &md->power_ro_lock);
power_ro_lock_fail:
device_remove_file(disk_to_dev(md->disk), &md->force_ro);
force_ro_fail:
del_gendisk(md->disk);
return ret;
}
#define CID_MANFID_SANDISK 0x2
#define CID_MANFID_TOSHIBA 0x11
#define CID_MANFID_MICRON 0x13
#define CID_MANFID_SAMSUNG 0x15
static const struct mmc_fixup blk_fixups[] =
{
MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
MMC_QUIRK_INAND_CMD38),
MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
MMC_QUIRK_INAND_CMD38),
MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
MMC_QUIRK_INAND_CMD38),
MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
MMC_QUIRK_INAND_CMD38),
MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
MMC_QUIRK_INAND_CMD38),
/*
* 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", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_BLK_NO_CMD23),
MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_BLK_NO_CMD23),
MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, 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, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
MMC_QUIRK_LONG_READ_TIME),
/* Some INAND MCP devices advertise incorrect timeout values */
MMC_FIXUP("SEM04G", 0x45, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_INAND_DATA_TIMEOUT),
/*
* On these Samsung MoviNAND parts, performing secure erase or
* secure trim can result in unrecoverable corruption due to a
* firmware bug.
*/
MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
END_FIXUP
};
static int mmc_blk_probe(struct mmc_card *card)
{
struct mmc_blk_data *md, *part_md;
char cap_str[10];
/*
* Check that the card supports the command class(es) we need.
*/
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
return -ENODEV;
md = mmc_blk_alloc(card);
if (IS_ERR(md))
return PTR_ERR(md);
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);
#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
mmc_set_bus_resume_policy(card->host, 1);
#endif
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 0;
}
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_MMC_BLOCK_DEFERRED_RESUME
mmc_set_bus_resume_policy(card->host, 0);
#endif
}
static void mmc_blk_shutdown(struct mmc_card *card)
{
struct mmc_blk_data *part_md;
struct mmc_blk_data *md = mmc_get_drvdata(card);
int rc;
/* Silent the block layer */
if (md) {
rc = mmc_queue_suspend(&md->queue);
if (rc)
goto suspend_error;
list_for_each_entry(part_md, &md->part, part) {
rc = mmc_queue_suspend(&part_md->queue);
if (rc)
goto suspend_error;
}
}
/* send power off notification */
if (mmc_card_mmc(card)) {
mmc_rpm_hold(card->host, &card->dev);
mmc_send_long_pon(card);
mmc_rpm_release(card->host, &card->dev);
}
return;
suspend_error:
pr_err("%s: mmc_queue_suspend returned error = %d",
mmc_hostname(card->host), rc);
}
#ifdef CONFIG_PM
static int mmc_blk_suspend(struct mmc_card *card)
{
struct mmc_blk_data *part_md;
struct mmc_blk_data *md = mmc_get_drvdata(card);
int rc = 0;
if (md) {
rc = mmc_queue_suspend(&md->queue);
if (rc)
goto out;
list_for_each_entry(part_md, &md->part, part) {
rc = mmc_queue_suspend(&part_md->queue);
if (rc)
goto out_resume;
}
}
goto out;
out_resume:
mmc_queue_resume(&md->queue);
list_for_each_entry(part_md, &md->part, part) {
mmc_queue_resume(&part_md->queue);
}
out:
return rc;
}
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) {
/*
* 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,
.shutdown = mmc_blk_shutdown,
};
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");
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