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Message-Id: <1366198740-9651-1-git-send-email-merez@codeaurora.org>
Date: Wed, 17 Apr 2013 14:38:47 +0300
From: Maya Erez <merez@...eaurora.org>
To: linux-mmc@...r.kernel.org
Cc: linux-arm-msm@...r.kernel.org, Maya Erez <merez@...eaurora.org>,
Yaniv Gardi <ygardi@...eaurora.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] 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@...eaurora.org>
Signed-off-by: Maya Erez <merez@...eaurora.org>
---
drivers/mmc/card/block.c | 68 +++++++++++++++++++++++++++++++--------------
drivers/mmc/card/queue.c | 2 +-
drivers/mmc/core/core.c | 21 ++++++++++++++
include/linux/mmc/core.h | 2 +
include/linux/mmc/host.h | 1 +
5 files changed, 72 insertions(+), 22 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index e12a03c..1f043ee 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -58,6 +58,8 @@ MODULE_ALIAS("mmc:block");
#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)) && \
@@ -409,6 +411,35 @@ static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
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)
{
@@ -511,6 +542,16 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
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) {
@@ -940,10 +981,10 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
{
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;
}
@@ -951,23 +992,11 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
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,
@@ -1003,9 +1032,6 @@ retry:
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;
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 9447a0e..fa9632e 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -173,7 +173,7 @@ static void mmc_queue_setup_discard(struct request_queue *q,
/* granularity must not be greater than max. discard */
if (card->pref_erase > max_discard)
q->limits.discard_granularity = 0;
- if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
+ if (mmc_can_secure_erase_trim(card))
queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
}
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 37c5dad..dea9381 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -402,6 +402,27 @@ static int mmc_wait_for_data_req_done(struct mmc_host *host,
context_info->is_done_rcv = false;
context_info->is_new_req = false;
cmd = mrq->cmd;
+
+ /*
+ * If host has timed out waiting for the sanitize
+ * to complete, card might be still in programming state
+ * so let's try to bring the card out of programming
+ * state.
+ */
+ if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
+ if (!mmc_interrupt_hpi(host->card)) {
+ pr_warning("%s: %s: Interrupted "
+ "sanitize\n",
+ mmc_hostname(host),
+ __func__);
+ cmd->error = 0;
+ break;
+ } else {
+ pr_err("%s: %s: Failed to interrupt "
+ "sanitize\n",
+ mmc_hostname(host), __func__);
+ }
+ }
if (!cmd->error || !cmd->retries ||
mmc_card_removed(host->card)) {
err = host->areq->err_check(host->card,
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 39613b9..bd06ff5 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -96,6 +96,8 @@ struct mmc_command {
*/
unsigned int cmd_timeout_ms; /* in milliseconds */
+ /* Set this flag only for blocking sanitize request */
+ bool sanitize_busy;
struct mmc_data *data; /* data segment associated with cmd */
struct mmc_request *mrq; /* associated request */
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index e326ae2..00c10be 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -281,6 +281,7 @@ struct mmc_host {
#define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
MMC_CAP2_PACKED_WR)
#define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before scan */
+#define MMC_CAP2_SANITIZE (1 << 15) /* Support Sanitize */
mmc_pm_flag_t pm_caps; /* supported pm features */
--
1.7.3.3
--
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
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