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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:
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return ERR_PTR(err);
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}
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static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
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struct mmc_blk_ioc_data *idata)
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{
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struct mmc_ioc_cmd *ic = &idata->ic;
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if (copy_to_user(&(ic_ptr->response), ic->response,
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sizeof(ic->response)))
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return -EFAULT;
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if (!idata->ic.write_flag) {
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if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
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idata->buf, idata->buf_bytes))
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return -EFAULT;
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}
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return 0;
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}
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static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
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u32 retries_max)
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{
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@ -447,12 +465,9 @@ out:
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return err;
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}
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static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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struct mmc_ioc_cmd __user *ic_ptr)
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static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
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struct mmc_blk_ioc_data *idata)
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{
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struct mmc_blk_ioc_data *idata;
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struct mmc_blk_data *md;
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struct mmc_card *card;
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struct mmc_command cmd = {0};
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struct mmc_data data = {0};
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struct mmc_request mrq = {NULL};
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@ -461,33 +476,12 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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int is_rpmb = false;
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u32 status = 0;
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/*
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* The caller must have CAP_SYS_RAWIO, and must be calling this on the
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* whole block device, not on a partition. This prevents overspray
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* between sibling partitions.
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*/
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if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
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return -EPERM;
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idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
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if (IS_ERR(idata))
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return PTR_ERR(idata);
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md = mmc_blk_get(bdev->bd_disk);
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if (!md) {
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err = -EINVAL;
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goto cmd_err;
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}
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if (!card || !md || !idata)
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return -EINVAL;
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if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
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is_rpmb = true;
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card = md->queue.card;
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto cmd_done;
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}
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cmd.opcode = idata->ic.opcode;
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cmd.arg = idata->ic.arg;
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cmd.flags = idata->ic.flags;
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@ -530,23 +524,21 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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mrq.cmd = &cmd;
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mmc_get_card(card);
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err = mmc_blk_part_switch(card, md);
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if (err)
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goto cmd_rel_host;
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return err;
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if (idata->ic.is_acmd) {
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err = mmc_app_cmd(card->host, card);
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if (err)
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goto cmd_rel_host;
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return err;
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}
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if (is_rpmb) {
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err = mmc_set_blockcount(card, data.blocks,
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idata->ic.write_flag & (1 << 31));
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if (err)
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goto cmd_rel_host;
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return err;
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}
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if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
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@ -557,7 +549,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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pr_err("%s: ioctl_do_sanitize() failed. err = %d",
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__func__, err);
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goto cmd_rel_host;
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return err;
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}
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mmc_wait_for_req(card->host, &mrq);
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@ -565,14 +557,12 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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if (cmd.error) {
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dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
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__func__, cmd.error);
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err = cmd.error;
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goto cmd_rel_host;
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return cmd.error;
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}
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if (data.error) {
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dev_err(mmc_dev(card->host), "%s: data error %d\n",
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__func__, data.error);
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err = data.error;
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goto cmd_rel_host;
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return data.error;
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}
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/*
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@ -582,18 +572,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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if (idata->ic.postsleep_min_us)
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usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
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if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
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err = -EFAULT;
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goto cmd_rel_host;
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}
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if (!idata->ic.write_flag) {
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if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
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idata->buf, idata->buf_bytes)) {
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err = -EFAULT;
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goto cmd_rel_host;
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}
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}
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memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
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if (is_rpmb) {
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/*
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@ -607,9 +586,42 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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__func__, status, err);
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}
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cmd_rel_host:
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return err;
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}
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static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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struct mmc_ioc_cmd __user *ic_ptr)
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{
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struct mmc_blk_ioc_data *idata;
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struct mmc_blk_data *md;
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struct mmc_card *card;
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int err;
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idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
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if (IS_ERR(idata))
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return PTR_ERR(idata);
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md = mmc_blk_get(bdev->bd_disk);
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if (!md) {
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err = -EINVAL;
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goto cmd_err;
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}
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card = md->queue.card;
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto cmd_done;
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}
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mmc_get_card(card);
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err = __mmc_blk_ioctl_cmd(card, md, idata);
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mmc_put_card(card);
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if (!err)
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err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
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cmd_done:
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mmc_blk_put(md);
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cmd_err:
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@ -618,13 +630,97 @@ cmd_err:
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return err;
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}
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static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
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struct mmc_ioc_multi_cmd __user *user)
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{
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struct mmc_blk_ioc_data **idata = NULL;
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struct mmc_ioc_cmd __user *cmds = user->cmds;
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struct mmc_card *card;
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struct mmc_blk_data *md;
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int i, err = -EFAULT;
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__u64 num_of_cmds;
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if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
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sizeof(num_of_cmds)))
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return -EFAULT;
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if (num_of_cmds > MMC_IOC_MAX_CMDS)
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return -EINVAL;
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idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
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if (!idata)
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return -ENOMEM;
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for (i = 0; i < num_of_cmds; i++) {
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idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
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if (IS_ERR(idata[i])) {
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err = PTR_ERR(idata[i]);
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num_of_cmds = i;
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goto cmd_err;
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}
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}
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md = mmc_blk_get(bdev->bd_disk);
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if (!md)
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goto cmd_err;
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card = md->queue.card;
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if (IS_ERR(card)) {
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err = PTR_ERR(card);
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goto cmd_done;
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}
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mmc_get_card(card);
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for (i = 0; i < num_of_cmds; i++) {
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err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
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if (err) {
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mmc_put_card(card);
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goto cmd_done;
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}
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}
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mmc_put_card(card);
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/* copy to user if data and response */
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for (i = 0; i < num_of_cmds; i++) {
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err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
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if (err)
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break;
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}
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cmd_done:
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mmc_blk_put(md);
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cmd_err:
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for (i = 0; i < num_of_cmds; i++) {
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kfree(idata[i]->buf);
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kfree(idata[i]);
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}
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kfree(idata);
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return err;
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}
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static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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int ret = -EINVAL;
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if (cmd == MMC_IOC_CMD)
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ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
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return ret;
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/*
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* The caller must have CAP_SYS_RAWIO, and must be calling this on the
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* whole block device, not on a partition. This prevents overspray
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* between sibling partitions.
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*/
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if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
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return -EPERM;
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switch (cmd) {
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case MMC_IOC_CMD:
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return mmc_blk_ioctl_cmd(bdev,
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(struct mmc_ioc_cmd __user *)arg);
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case MMC_IOC_MULTI_CMD:
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return mmc_blk_ioctl_multi_cmd(bdev,
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(struct mmc_ioc_multi_cmd __user *)arg);
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default:
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return -EINVAL;
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}
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}
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#ifdef CONFIG_COMPAT
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@ -45,8 +45,24 @@ struct mmc_ioc_cmd {
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};
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#define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
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#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
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/**
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* struct mmc_ioc_multi_cmd - multi command information
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* @num_of_cmds: Number of commands to send. Must be equal to or less than
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* MMC_IOC_MAX_CMDS.
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* @cmds: Array of commands with length equal to 'num_of_cmds'
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*/
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struct mmc_ioc_multi_cmd {
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__u64 num_of_cmds;
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struct mmc_ioc_cmd cmds[0];
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};
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#define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
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/*
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* MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by
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* the structure mmc_ioc_multi_cmd. The MMC driver will issue all
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* commands in array in sequence to card.
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*/
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#define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd)
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/*
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* Since this ioctl is only meant to enhance (and not replace) normal access
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* to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
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@ -54,4 +70,5 @@ struct mmc_ioc_cmd {
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* block device operations.
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*/
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#define MMC_IOC_MAX_BYTES (512L * 256)
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#define MMC_IOC_MAX_CMDS 255
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#endif /* LINUX_MMC_IOCTL_H */
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