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block.c
3191 lines (2669 loc) · 79 KB
/
block.c
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// SPDX-License-Identifier: GPL-2.0
/*
* 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/kref.h>
#include <linux/blkdev.h>
#include <linux/cdev.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/idr.h>
#include <linux/debugfs.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 <linux/uaccess.h>
#include "queue.h"
#include "block.h"
#include "core.h"
#include "card.h"
#include "crypto.h"
#include "host.h"
#include "bus.h"
#include "mmc_ops.h"
#include "quirks.h"
#include "sd_ops.h"
MODULE_ALIAS("mmc:block");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "mmcblk."
/*
* Set a 10 second timeout for polling write request busy state. Note, mmc core
* is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
* second software timer to timeout the whole request, so 10 seconds should be
* ample.
*/
#define MMC_BLK_TIMEOUT_MS (10 * 1000)
#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
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 (1 << 20) / number of minors per device. It is also
* limited by the MAX_DEVICES below.
*/
static int max_devices;
#define MAX_DEVICES 256
static DEFINE_IDA(mmc_blk_ida);
static DEFINE_IDA(mmc_rpmb_ida);
struct mmc_blk_busy_data {
struct mmc_card *card;
u32 status;
};
/*
* There is one mmc_blk_data per slot.
*/
struct mmc_blk_data {
struct device *parent;
struct gendisk *disk;
struct mmc_queue queue;
struct list_head part;
struct list_head rpmbs;
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 */
struct kref kref;
unsigned int read_only;
unsigned int part_type;
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)
#define MMC_BLK_CQE_RECOVERY BIT(4)
#define MMC_BLK_TRIM BIT(5)
/*
* Only set in main mmc_blk_data associated
* with mmc_card with dev_set_drvdata, and keeps
* track of the current selected device partition.
*/
unsigned int part_curr;
#define MMC_BLK_PART_INVALID UINT_MAX /* Unknown partition active */
int area_type;
/* debugfs files (only in main mmc_blk_data) */
struct dentry *status_dentry;
struct dentry *ext_csd_dentry;
};
/* Device type for RPMB character devices */
static dev_t mmc_rpmb_devt;
/* Bus type for RPMB character devices */
static const struct bus_type mmc_rpmb_bus_type = {
.name = "mmc_rpmb",
};
/**
* struct mmc_rpmb_data - special RPMB device type for these areas
* @dev: the device for the RPMB area
* @chrdev: character device for the RPMB area
* @id: unique device ID number
* @part_index: partition index (0 on first)
* @md: parent MMC block device
* @node: list item, so we can put this device on a list
*/
struct mmc_rpmb_data {
struct device dev;
struct cdev chrdev;
int id;
unsigned int part_index;
struct mmc_blk_data *md;
struct list_head node;
};
static DEFINE_MUTEX(open_lock);
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,
unsigned int part_type);
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
struct mmc_card *card,
int recovery_mode,
struct mmc_queue *mq);
static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
static int mmc_spi_err_check(struct mmc_card *card);
static int mmc_blk_busy_cb(void *cb_data, bool *busy);
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 && !kref_get_unless_zero(&md->kref))
md = NULL;
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_kref_release(struct kref *ref)
{
struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref);
int devidx;
devidx = mmc_get_devidx(md->disk);
ida_free(&mmc_blk_ida, devidx);
mutex_lock(&open_lock);
md->disk->private_data = NULL;
mutex_unlock(&open_lock);
put_disk(md->disk);
kfree(md);
}
static void mmc_blk_put(struct mmc_blk_data *md)
{
kref_put(&md->kref, mmc_blk_kref_release);
}
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);
mmc_blk_put(md);
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_queue *mq;
struct request *req;
unsigned long set;
if (kstrtoul(buf, 0, &set))
return -EINVAL;
if (set != 1)
return count;
md = mmc_blk_get(dev_to_disk(dev));
mq = &md->queue;
/* Dispatch locking to the block layer */
req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_OUT, 0);
if (IS_ERR(req)) {
count = PTR_ERR(req);
goto out_put;
}
req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
req_to_mmc_queue_req(req)->drv_op_result = -EIO;
blk_execute_rq(req, false);
ret = req_to_mmc_queue_req(req)->drv_op_result;
blk_mq_free_request(req);
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);
}
}
out_put:
mmc_blk_put(md);
return count;
}
static DEVICE_ATTR(ro_lock_until_next_power_on, 0,
power_ro_lock_show, power_ro_lock_store);
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\n",
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 DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store);
static struct attribute *mmc_disk_attrs[] = {
&dev_attr_force_ro.attr,
&dev_attr_ro_lock_until_next_power_on.attr,
NULL,
};
static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj,
struct attribute *a, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
umode_t mode = a->mode;
if (a == &dev_attr_ro_lock_until_next_power_on.attr &&
(md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
md->queue.card->ext_csd.boot_ro_lockable) {
mode = S_IRUGO;
if (!(md->queue.card->ext_csd.boot_ro_lock &
EXT_CSD_BOOT_WP_B_PWR_WP_DIS))
mode |= S_IWUSR;
}
mmc_blk_put(md);
return mode;
}
static const struct attribute_group mmc_disk_attr_group = {
.is_visible = mmc_disk_attrs_is_visible,
.attrs = mmc_disk_attrs,
};
static const struct attribute_group *mmc_disk_attr_groups[] = {
&mmc_disk_attr_group,
NULL,
};
static int mmc_blk_open(struct gendisk *disk, blk_mode_t mode)
{
struct mmc_blk_data *md = mmc_blk_get(disk);
int ret = -ENXIO;
mutex_lock(&block_mutex);
if (md) {
ret = 0;
if ((mode & BLK_OPEN_WRITE) && md->read_only) {
mmc_blk_put(md);
ret = -EROFS;
}
}
mutex_unlock(&block_mutex);
return ret;
}
static void mmc_blk_release(struct gendisk *disk)
{
struct mmc_blk_data *md = disk->private_data;
mutex_lock(&block_mutex);
mmc_blk_put(md);
mutex_unlock(&block_mutex);
}
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;
unsigned int flags;
#define MMC_BLK_IOC_DROP BIT(0) /* drop this mrq */
#define MMC_BLK_IOC_SBC BIT(1) /* use mrq.sbc */
struct mmc_rpmb_data *rpmb;
};
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) {
idata->buf = NULL;
return idata;
}
idata->buf = memdup_user((void __user *)(unsigned long)
idata->ic.data_ptr, idata->buf_bytes);
if (IS_ERR(idata->buf)) {
err = PTR_ERR(idata->buf);
goto idata_err;
}
return idata;
idata_err:
kfree(idata);
out:
return ERR_PTR(err);
}
static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
struct mmc_blk_ioc_data *idata)
{
struct mmc_ioc_cmd *ic = &idata->ic;
if (copy_to_user(&(ic_ptr->response), ic->response,
sizeof(ic->response)))
return -EFAULT;
if (!idata->ic.write_flag) {
if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
idata->buf, idata->buf_bytes))
return -EFAULT;
}
return 0;
}
static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
struct mmc_blk_ioc_data **idatas, int i)
{
struct mmc_command cmd = {}, sbc = {};
struct mmc_data data = {};
struct mmc_request mrq = {};
struct scatterlist sg;
bool r1b_resp;
unsigned int busy_timeout_ms;
int err;
unsigned int target_part;
struct mmc_blk_ioc_data *idata = idatas[i];
struct mmc_blk_ioc_data *prev_idata = NULL;
if (!card || !md || !idata)
return -EINVAL;
if (idata->flags & MMC_BLK_IOC_DROP)
return 0;
if (idata->flags & MMC_BLK_IOC_SBC && i > 0)
prev_idata = idatas[i - 1];
/*
* The RPMB accesses comes in from the character device, so we
* need to target these explicitly. Else we just target the
* partition type for the block device the ioctl() was issued
* on.
*/
if (idata->rpmb) {
/* Support multiple RPMB partitions */
target_part = idata->rpmb->part_index;
target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
} else {
target_part = md->part_type;
}
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;
mrq.data = &data;
}
mrq.cmd = &cmd;
err = mmc_blk_part_switch(card, target_part);
if (err)
return err;
if (idata->ic.is_acmd) {
err = mmc_app_cmd(card->host, card);
if (err)
return err;
}
if (idata->rpmb || prev_idata) {
sbc.opcode = MMC_SET_BLOCK_COUNT;
/*
* We don't do any blockcount validation because the max size
* may be increased by a future standard. We just copy the
* 'Reliable Write' bit here.
*/
sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
if (prev_idata)
sbc.arg = prev_idata->ic.arg;
sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
mrq.sbc = &sbc;
}
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
(cmd.opcode == MMC_SWITCH))
return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
/* If it's an R1B response we need some more preparations. */
busy_timeout_ms = idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS;
r1b_resp = (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B;
if (r1b_resp)
mmc_prepare_busy_cmd(card->host, &cmd, busy_timeout_ms);
mmc_wait_for_req(card->host, &mrq);
memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
if (prev_idata) {
memcpy(&prev_idata->ic.response, sbc.resp, sizeof(sbc.resp));
if (sbc.error) {
dev_err(mmc_dev(card->host), "%s: sbc error %d\n",
__func__, sbc.error);
return sbc.error;
}
}
if (cmd.error) {
dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
__func__, cmd.error);
return cmd.error;
}
if (data.error) {
dev_err(mmc_dev(card->host), "%s: data error %d\n",
__func__, data.error);
return data.error;
}
/*
* Make sure the cache of the PARTITION_CONFIG register and
* PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
* changed it successfully.
*/
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
(cmd.opcode == MMC_SWITCH)) {
struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
/*
* Update cache so the next mmc_blk_part_switch call operates
* on up-to-date data.
*/
card->ext_csd.part_config = value;
main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
}
/*
* Make sure to update CACHE_CTRL in case it was changed. The cache
* will get turned back on if the card is re-initialized, e.g.
* suspend/resume or hw reset in recovery.
*/
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
(cmd.opcode == MMC_SWITCH)) {
u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
card->ext_csd.cache_ctrl = value;
}
/*
* 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 (mmc_host_is_spi(card->host)) {
if (idata->ic.write_flag || r1b_resp || cmd.flags & MMC_RSP_SPI_BUSY)
return mmc_spi_err_check(card);
return err;
}
/*
* Ensure RPMB, writes and R1B responses are completed by polling with
* CMD13. Note that, usually we don't need to poll when using HW busy
* detection, but here it's needed since some commands may indicate the
* error through the R1 status bits.
*/
if (idata->rpmb || idata->ic.write_flag || r1b_resp) {
struct mmc_blk_busy_data cb_data = {
.card = card,
};
err = __mmc_poll_for_busy(card->host, 0, busy_timeout_ms,
&mmc_blk_busy_cb, &cb_data);
idata->ic.response[0] = cb_data.status;
}
return err;
}
static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
struct mmc_ioc_cmd __user *ic_ptr,
struct mmc_rpmb_data *rpmb)
{
struct mmc_blk_ioc_data *idata;
struct mmc_blk_ioc_data *idatas[1];
struct mmc_queue *mq;
struct mmc_card *card;
int err = 0, ioc_err = 0;
struct request *req;
idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
if (IS_ERR(idata))
return PTR_ERR(idata);
/* This will be NULL on non-RPMB ioctl():s */
idata->rpmb = rpmb;
card = md->queue.card;
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto cmd_done;
}
/*
* Dispatch the ioctl() into the block request queue.
*/
mq = &md->queue;
req = blk_mq_alloc_request(mq->queue,
idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto cmd_done;
}
idatas[0] = idata;
req_to_mmc_queue_req(req)->drv_op =
rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
req_to_mmc_queue_req(req)->drv_op_result = -EIO;
req_to_mmc_queue_req(req)->drv_op_data = idatas;
req_to_mmc_queue_req(req)->ioc_count = 1;
blk_execute_rq(req, false);
ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
blk_mq_free_request(req);
cmd_done:
kfree(idata->buf);
kfree(idata);
return ioc_err ? ioc_err : err;
}
static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
struct mmc_ioc_multi_cmd __user *user,
struct mmc_rpmb_data *rpmb)
{
struct mmc_blk_ioc_data **idata = NULL;
struct mmc_ioc_cmd __user *cmds = user->cmds;
struct mmc_card *card;
struct mmc_queue *mq;
int err = 0, ioc_err = 0;
__u64 num_of_cmds;
unsigned int i, n;
struct request *req;
if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
sizeof(num_of_cmds)))
return -EFAULT;
if (!num_of_cmds)
return 0;
if (num_of_cmds > MMC_IOC_MAX_CMDS)
return -EINVAL;
n = num_of_cmds;
idata = kcalloc(n, sizeof(*idata), GFP_KERNEL);
if (!idata)
return -ENOMEM;
for (i = 0; i < n; i++) {
idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
if (IS_ERR(idata[i])) {
err = PTR_ERR(idata[i]);
n = i;
goto cmd_err;
}
/* This will be NULL on non-RPMB ioctl():s */
idata[i]->rpmb = rpmb;
}
card = md->queue.card;
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto cmd_err;
}
/*
* Dispatch the ioctl()s into the block request queue.
*/
mq = &md->queue;
req = blk_mq_alloc_request(mq->queue,
idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto cmd_err;
}
req_to_mmc_queue_req(req)->drv_op =
rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
req_to_mmc_queue_req(req)->drv_op_result = -EIO;
req_to_mmc_queue_req(req)->drv_op_data = idata;
req_to_mmc_queue_req(req)->ioc_count = n;
blk_execute_rq(req, false);
ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
/* copy to user if data and response */
for (i = 0; i < n && !err; i++)
err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
blk_mq_free_request(req);
cmd_err:
for (i = 0; i < n; i++) {
kfree(idata[i]->buf);
kfree(idata[i]);
}
kfree(idata);
return ioc_err ? ioc_err : err;
}
static int mmc_blk_check_blkdev(struct block_device *bdev)
{
/*
* 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_is_partition(bdev))
return -EPERM;
return 0;
}
static int mmc_blk_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg)
{
struct mmc_blk_data *md;
int ret;
switch (cmd) {
case MMC_IOC_CMD:
ret = mmc_blk_check_blkdev(bdev);
if (ret)
return ret;
md = mmc_blk_get(bdev->bd_disk);
if (!md)
return -EINVAL;
ret = mmc_blk_ioctl_cmd(md,
(struct mmc_ioc_cmd __user *)arg,
NULL);
mmc_blk_put(md);
return ret;
case MMC_IOC_MULTI_CMD:
ret = mmc_blk_check_blkdev(bdev);
if (ret)
return ret;
md = mmc_blk_get(bdev->bd_disk);
if (!md)
return -EINVAL;
ret = mmc_blk_ioctl_multi_cmd(md,
(struct mmc_ioc_multi_cmd __user *)arg,
NULL);
mmc_blk_put(md);
return ret;
default:
return -EINVAL;
}
}
#ifdef CONFIG_COMPAT
static int mmc_blk_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg)
{
return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
}
#endif
static int mmc_blk_alternative_gpt_sector(struct gendisk *disk,
sector_t *sector)
{
struct mmc_blk_data *md;
int ret;
md = mmc_blk_get(disk);
if (!md)
return -EINVAL;
if (md->queue.card)
ret = mmc_card_alternative_gpt_sector(md->queue.card, sector);
else
ret = -ENODEV;
mmc_blk_put(md);
return ret;
}
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
.alternative_gpt_sector = mmc_blk_alternative_gpt_sector,
};
static int mmc_blk_part_switch_pre(struct mmc_card *card,
unsigned int part_type)
{
const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_MASK;
const unsigned int rpmb = EXT_CSD_PART_CONFIG_ACC_RPMB;
int ret = 0;
if ((part_type & mask) == rpmb) {
if (card->ext_csd.cmdq_en) {
ret = mmc_cmdq_disable(card);
if (ret)
return ret;
}
mmc_retune_pause(card->host);
}
return ret;
}
static int mmc_blk_part_switch_post(struct mmc_card *card,
unsigned int part_type)
{
const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_MASK;
const unsigned int rpmb = EXT_CSD_PART_CONFIG_ACC_RPMB;
int ret = 0;
if ((part_type & mask) == rpmb) {
mmc_retune_unpause(card->host);
if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
ret = mmc_cmdq_enable(card);
}
return ret;
}
static inline int mmc_blk_part_switch(struct mmc_card *card,
unsigned int part_type)
{
int ret = 0;
struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
if (main_md->part_curr == part_type)
return 0;
if (mmc_card_mmc(card)) {
u8 part_config = card->ext_csd.part_config;
ret = mmc_blk_part_switch_pre(card, part_type);
if (ret)
return ret;
part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
part_config |= part_type;
ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_PART_CONFIG, part_config,
card->ext_csd.part_time);
if (ret) {
mmc_blk_part_switch_post(card, part_type);
return ret;
}
card->ext_csd.part_config = part_config;
ret = mmc_blk_part_switch_post(card, main_md->part_curr);
}
main_md->part_curr = part_type;
return ret;
}
static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
{
int err;
u32 result;
__be32 *blocks;
struct mmc_request mrq = {};
struct mmc_command cmd = {};
struct mmc_data data = {};
struct scatterlist sg;
err = mmc_app_cmd(card->host, card);
if (err)
return err;
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 -ENOMEM;
sg_init_one(&sg, blocks, 4);
mmc_wait_for_req(card->host, &mrq);
result = ntohl(*blocks);
kfree(blocks);
if (cmd.error || data.error)
return -EIO;
*written_blocks = result;
return 0;
}
static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
{
if (host->actual_clock)
return host->actual_clock / 1000;
/* Clock may be subject to a divisor, fudge it by a factor of 2. */
if (host->ios.clock)