mmc: card: Adding support for sanitize in eMMC 4.5
The sanitize support is added as a user-app ioctl call, and
was removed from the block-device request, since its purpose is
to be invoked not via File-System but by a user.
This feature deletes the unmap memory region of the eMMC card,
by writing to a specific register in the EXT_CSD.
unmap region is the memory region that was previously deleted
(by erase, trim or discard operation).
In order to avoid timeout when sanitizing large-scale cards,
the timeout for sanitize operation is 240 seconds.
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index dd27b07..80b05b2 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -58,6 +58,8 @@
#define INAND_CMD38_ARG_SECTRIM1 0x81
#define INAND_CMD38_ARG_SECTRIM2 0x88
#define MMC_BLK_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
+#define MMC_SANITIZE_REQ_TIMEOUT 240000
+#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
(req->cmd_flags & REQ_META)) && \
@@ -408,6 +410,35 @@
return err;
}
+static int ioctl_do_sanitize(struct mmc_card *card)
+{
+ int err;
+
+ if (!(mmc_can_sanitize(card) &&
+ (card->host->caps2 & MMC_CAP2_SANITIZE))) {
+ pr_warn("%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 - 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:
+ return err;
+}
+
static int mmc_blk_ioctl_cmd(struct block_device *bdev,
struct mmc_ioc_cmd __user *ic_ptr)
{
@@ -510,6 +541,16 @@
goto cmd_rel_host;
}
+ if (MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) {
+ err = ioctl_do_sanitize(card);
+
+ if (err)
+ pr_err("%s: ioctl_do_sanitize() failed. err = %d",
+ __func__, err);
+
+ goto cmd_rel_host;
+ }
+
mmc_wait_for_req(card->host, &mrq);
if (cmd.error) {
@@ -939,10 +980,10 @@
{
struct mmc_blk_data *md = mq->data;
struct mmc_card *card = md->queue.card;
- unsigned int from, nr, arg, trim_arg, erase_arg;
+ unsigned int from, nr, arg;
int err = 0, type = MMC_BLK_SECDISCARD;
- if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
+ if (!(mmc_can_secure_erase_trim(card))) {
err = -EOPNOTSUPP;
goto out;
}
@@ -950,23 +991,11 @@
from = blk_rq_pos(req);
nr = blk_rq_sectors(req);
- /* The sanitize operation is supported at v4.5 only */
- if (mmc_can_sanitize(card)) {
- erase_arg = MMC_ERASE_ARG;
- trim_arg = MMC_TRIM_ARG;
- } else {
- erase_arg = MMC_SECURE_ERASE_ARG;
- trim_arg = MMC_SECURE_TRIM1_ARG;
- }
+ if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
+ arg = MMC_SECURE_TRIM1_ARG;
+ else
+ arg = MMC_SECURE_ERASE_ARG;
- if (mmc_erase_group_aligned(card, from, nr))
- arg = erase_arg;
- else if (mmc_can_trim(card))
- arg = trim_arg;
- else {
- err = -EINVAL;
- goto out;
- }
retry:
if (card->quirks & MMC_QUIRK_INAND_CMD38) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
@@ -1002,9 +1031,6 @@
goto out;
}
- if (mmc_can_sanitize(card))
- err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_SANITIZE_START, 1, 0);
out_retry:
if (err && !mmc_blk_reset(md, card->host, type))
goto retry;