mmc: block: Add new ioctl to send multi commands
Certain eMMC devices allow vendor specific device information to be read via a sequence of vendor commands. These vendor commands must be issued in sequence and an atomic fashion. One way to support this would be to add an ioctl function for sending a sequence of commands to the device atomically as proposed here. These multi commands are simple array of the existing mmc_ioc_cmd structure. The structure passed via the ioctl uses a __u64 type to specify the number of commands (so that the structure is aligned on a 64-bit boundary) and a zero length array as a header for list of commands to be issued. The maximum number of commands that can be sent is determined by MMC_IOC_MAX_CMDS (which defaults to 255 and should be more than sufficient). This based upon work by Seshagiri Holi <sholi@nvidia.com>. Signed-off-by: Seshagiri Holi <sholi@nvidia.com> Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jon Hunter
Ulf Hansson
parent
aaa58d0e93
commit
a5f5774c55
|
|
@ -387,6 +387,24 @@ 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 ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
|
||||
u32 retries_max)
|
||||
{
|
||||
|
|
@ -447,12 +465,9 @@ out:
|
|||
return err;
|
||||
}
|
||||
|
||||
static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
||||
struct mmc_ioc_cmd __user *ic_ptr)
|
||||
static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
|
||||
struct mmc_blk_ioc_data *idata)
|
||||
{
|
||||
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};
|
||||
|
|
@ -461,33 +476,12 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
|||
int is_rpmb = false;
|
||||
u32 status = 0;
|
||||
|
||||
/*
|
||||
* 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 cmd_err;
|
||||
}
|
||||
if (!card || !md || !idata)
|
||||
return -EINVAL;
|
||||
|
||||
if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
|
||||
is_rpmb = true;
|
||||
|
||||
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;
|
||||
|
|
@ -530,23 +524,21 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
|||
|
||||
mrq.cmd = &cmd;
|
||||
|
||||
mmc_get_card(card);
|
||||
|
||||
err = mmc_blk_part_switch(card, md);
|
||||
if (err)
|
||||
goto cmd_rel_host;
|
||||
return err;
|
||||
|
||||
if (idata->ic.is_acmd) {
|
||||
err = mmc_app_cmd(card->host, card);
|
||||
if (err)
|
||||
goto cmd_rel_host;
|
||||
return err;
|
||||
}
|
||||
|
||||
if (is_rpmb) {
|
||||
err = mmc_set_blockcount(card, data.blocks,
|
||||
idata->ic.write_flag & (1 << 31));
|
||||
if (err)
|
||||
goto cmd_rel_host;
|
||||
return err;
|
||||
}
|
||||
|
||||
if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
|
||||
|
|
@ -557,7 +549,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
|||
pr_err("%s: ioctl_do_sanitize() failed. err = %d",
|
||||
__func__, err);
|
||||
|
||||
goto cmd_rel_host;
|
||||
return err;
|
||||
}
|
||||
|
||||
mmc_wait_for_req(card->host, &mrq);
|
||||
|
|
@ -565,14 +557,12 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
|||
if (cmd.error) {
|
||||
dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
|
||||
__func__, cmd.error);
|
||||
err = cmd.error;
|
||||
goto cmd_rel_host;
|
||||
return cmd.error;
|
||||
}
|
||||
if (data.error) {
|
||||
dev_err(mmc_dev(card->host), "%s: data error %d\n",
|
||||
__func__, data.error);
|
||||
err = data.error;
|
||||
goto cmd_rel_host;
|
||||
return data.error;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -582,18 +572,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
|||
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;
|
||||
}
|
||||
}
|
||||
memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
|
||||
|
||||
if (is_rpmb) {
|
||||
/*
|
||||
|
|
@ -607,9 +586,42 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
|
|||
__func__, status, err);
|
||||
}
|
||||
|
||||
cmd_rel_host:
|
||||
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;
|
||||
int err;
|
||||
|
||||
idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
|
||||
if (IS_ERR(idata))
|
||||
return PTR_ERR(idata);
|
||||
|
||||
md = mmc_blk_get(bdev->bd_disk);
|
||||
if (!md) {
|
||||
err = -EINVAL;
|
||||
goto cmd_err;
|
||||
}
|
||||
|
||||
card = md->queue.card;
|
||||
if (IS_ERR(card)) {
|
||||
err = PTR_ERR(card);
|
||||
goto cmd_done;
|
||||
}
|
||||
|
||||
mmc_get_card(card);
|
||||
|
||||
err = __mmc_blk_ioctl_cmd(card, md, idata);
|
||||
|
||||
mmc_put_card(card);
|
||||
|
||||
if (!err)
|
||||
err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
|
||||
|
||||
cmd_done:
|
||||
mmc_blk_put(md);
|
||||
cmd_err:
|
||||
|
|
@ -618,13 +630,97 @@ cmd_err:
|
|||
return err;
|
||||
}
|
||||
|
||||
static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
|
||||
struct mmc_ioc_multi_cmd __user *user)
|
||||
{
|
||||
struct mmc_blk_ioc_data **idata = NULL;
|
||||
struct mmc_ioc_cmd __user *cmds = user->cmds;
|
||||
struct mmc_card *card;
|
||||
struct mmc_blk_data *md;
|
||||
int i, err = -EFAULT;
|
||||
__u64 num_of_cmds;
|
||||
|
||||
if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
|
||||
sizeof(num_of_cmds)))
|
||||
return -EFAULT;
|
||||
|
||||
if (num_of_cmds > MMC_IOC_MAX_CMDS)
|
||||
return -EINVAL;
|
||||
|
||||
idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
|
||||
if (!idata)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < num_of_cmds; i++) {
|
||||
idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
|
||||
if (IS_ERR(idata[i])) {
|
||||
err = PTR_ERR(idata[i]);
|
||||
num_of_cmds = i;
|
||||
goto cmd_err;
|
||||
}
|
||||
}
|
||||
|
||||
md = mmc_blk_get(bdev->bd_disk);
|
||||
if (!md)
|
||||
goto cmd_err;
|
||||
|
||||
card = md->queue.card;
|
||||
if (IS_ERR(card)) {
|
||||
err = PTR_ERR(card);
|
||||
goto cmd_done;
|
||||
}
|
||||
|
||||
mmc_get_card(card);
|
||||
|
||||
for (i = 0; i < num_of_cmds; i++) {
|
||||
err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
|
||||
if (err) {
|
||||
mmc_put_card(card);
|
||||
goto cmd_done;
|
||||
}
|
||||
}
|
||||
|
||||
mmc_put_card(card);
|
||||
|
||||
/* copy to user if data and response */
|
||||
for (i = 0; i < num_of_cmds; i++) {
|
||||
err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
|
||||
if (err)
|
||||
break;
|
||||
}
|
||||
|
||||
cmd_done:
|
||||
mmc_blk_put(md);
|
||||
cmd_err:
|
||||
for (i = 0; i < num_of_cmds; i++) {
|
||||
kfree(idata[i]->buf);
|
||||
kfree(idata[i]);
|
||||
}
|
||||
kfree(idata);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int ret = -EINVAL;
|
||||
if (cmd == MMC_IOC_CMD)
|
||||
ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
|
||||
return ret;
|
||||
/*
|
||||
* 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;
|
||||
|
||||
switch (cmd) {
|
||||
case MMC_IOC_CMD:
|
||||
return mmc_blk_ioctl_cmd(bdev,
|
||||
(struct mmc_ioc_cmd __user *)arg);
|
||||
case MMC_IOC_MULTI_CMD:
|
||||
return mmc_blk_ioctl_multi_cmd(bdev,
|
||||
(struct mmc_ioc_multi_cmd __user *)arg);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
|
|
|
|||
|
|
@ -45,8 +45,24 @@ struct mmc_ioc_cmd {
|
|||
};
|
||||
#define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
|
||||
|
||||
#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
|
||||
/**
|
||||
* struct mmc_ioc_multi_cmd - multi command information
|
||||
* @num_of_cmds: Number of commands to send. Must be equal to or less than
|
||||
* MMC_IOC_MAX_CMDS.
|
||||
* @cmds: Array of commands with length equal to 'num_of_cmds'
|
||||
*/
|
||||
struct mmc_ioc_multi_cmd {
|
||||
__u64 num_of_cmds;
|
||||
struct mmc_ioc_cmd cmds[0];
|
||||
};
|
||||
|
||||
#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
|
||||
/*
|
||||
* MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by
|
||||
* the structure mmc_ioc_multi_cmd. The MMC driver will issue all
|
||||
* commands in array in sequence to card.
|
||||
*/
|
||||
#define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd)
|
||||
/*
|
||||
* Since this ioctl is only meant to enhance (and not replace) normal access
|
||||
* to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
|
||||
|
|
@ -54,4 +70,5 @@ struct mmc_ioc_cmd {
|
|||
* block device operations.
|
||||
*/
|
||||
#define MMC_IOC_MAX_BYTES (512L * 256)
|
||||
#define MMC_IOC_MAX_CMDS 255
|
||||
#endif /* LINUX_MMC_IOCTL_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue