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Subject[PATCH v3 2/2] mmc: card: Adding support for Sanitize in eMMC v4.5
Date
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>

---
drivers/mmc/card/block.c | 58 ++++++++++++++++++++++++++++++++++++++-------
drivers/mmc/card/queue.c | 12 ++++++++-
include/linux/mmc/card.h | 7 +++++
include/linux/mmc/host.h | 1 +
4 files changed, 68 insertions(+), 10 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 0c959c9..5be77e6 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -830,6 +830,9 @@ static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
from = blk_rq_pos(req);
nr = blk_rq_sectors(req);

+ /* 1ST priority is DISCARD.
+ 2ND is TRIM
+ 3RD is ERASE */
if (mmc_can_discard(card))
arg = MMC_DISCARD_ARG;
else if (mmc_can_trim(card))
@@ -868,18 +871,11 @@ static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
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;
}

- /* The sanitize operation is supported at v4.5 only */
- if (mmc_can_sanitize(card)) {
- err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_SANITIZE_START, 1, 0);
- goto out;
- }
-
from = blk_rq_pos(req);
nr = blk_rq_sectors(req);

@@ -922,6 +918,44 @@ out:
return err ? 0 : 1;
}

+int mmc_blk_issue_sanitize_rq(struct mmc_queue *mq,
+ struct request *req)
+{
+ struct mmc_blk_data *md = mq->data;
+ struct mmc_card *card = md->queue.card;
+ int err = 0;
+
+ if (!(mmc_can_sanitize(card) && (mq->card->host->caps2 & MMC_CAP2_SANITIZE))) {
+ pr_err("%s: SANITIZE is not supported", __func__);
+ err = -EOPNOTSUPP;
+ goto out;
+ }
+
+ pr_info("%s: SANITIZE is supported", __func__);
+
+ mmc_sd_card_set_sanitize_in_progress(card);
+
+ pr_info("%s: issueing SANITIZE command...", __func__);
+
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_SANITIZE_START, 1, 0);
+
+ pr_info("%s: SANITIZE command returned...", __func__);
+
+ if (err)
+ pr_err("%s: mmcblk: mmc_switch() failed. err=%d\n",
+ __func__, err);
+
+ mmc_sd_card_set_sanitize_completed(card);
+
+out:
+ spin_lock_irq(&md->lock);
+ __blk_end_request(req, err, blk_rq_bytes(req));
+ spin_unlock_irq(&md->lock);
+
+ return err ? 0 : 1;
+}
+
static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
{
struct mmc_blk_data *md = mq->data;
@@ -1379,7 +1413,12 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
goto out;
}

- if (req && req->cmd_flags & REQ_DISCARD) {
+ if (req && req->cmd_flags & REQ_SANITIZE) {
+ /* complete ongoing async transfer before issuing discard */
+ if (card->host && card->host->areq)
+ mmc_blk_issue_rw_rq(mq, NULL);
+ ret = mmc_blk_issue_sanitize_rq(mq, req);
+ } else if (req && req->cmd_flags & REQ_DISCARD) {
/* complete ongoing async transfer before issuing discard */
if (card->host->areq)
mmc_blk_issue_rw_rq(mq, NULL);
@@ -1396,6 +1435,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
ret = mmc_blk_issue_rw_rq(mq, req);
}

+
out:
if (!req)
/* release host only when there are no more requests */
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index dcad59c..6946ac1 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -140,10 +140,15 @@ 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);
}

+static void mmc_queue_setup_sanitize(struct request_queue *q)
+{
+ queue_flag_set_unlocked(QUEUE_FLAG_SANITIZE, q);
+}
+
/**
* mmc_init_queue - initialise a queue structure.
* @mq: mmc queue
@@ -181,6 +186,11 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
if (mmc_can_erase(card))
mmc_queue_setup_discard(mq->queue, card);

+ if ((mmc_can_sanitize(card) && (host->caps2 & MMC_CAP2_SANITIZE)))
+ mmc_queue_setup_sanitize(mq->queue);
+ else
+ pr_info("%s - card doesn't support sanitize", __func__);
+
#ifdef CONFIG_MMC_BLOCK_BOUNCE
if (host->max_segs == 1) {
unsigned int bouncesz;
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 9478a6b..0890e9c 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -236,6 +236,9 @@ struct mmc_card {
#define MMC_POWEROFF_SHORT 2
#define MMC_POWEROFF_LONG 3

+/* card is in sanitize progress */
+#define MMC_STATE_SANITIZE_IN_PROGRESS (1<<9)
+
unsigned int erase_size; /* erase size in sectors */
unsigned int erase_shift; /* if erase unit is power 2 */
unsigned int pref_erase; /* in sectors */
@@ -388,6 +391,10 @@ static inline void __maybe_unused remove_quirk(struct mmc_card *card, int data)
#define mmc_card_set_ddr_mode(c) ((c)->state |= MMC_STATE_HIGHSPEED_DDR)
#define mmc_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
#define mmc_sd_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
+#define mmc_sd_card_set_sanitize_in_progress(c) ((c)->state |= \
+ MMC_STATE_SANITIZE_IN_PROGRESS)
+#define mmc_sd_card_set_sanitize_completed(c) ((c)->state &= \
+ ~MMC_STATE_SANITIZE_IN_PROGRESS)
#define mmc_card_set_ext_capacity(c) ((c)->state |= MMC_CARD_SDXC)
#define mmc_card_set_removed(c) ((c)->state |= MMC_CARD_REMOVED)

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 9a03d03..93210aa 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -242,6 +242,7 @@ struct mmc_host {
#define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
#define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
+#define MMC_CAP2_SANITIZE (1<<4) /* Support Sanitize */

mmc_pm_flag_t pm_caps; /* supported pm features */
unsigned int power_notify_type;
--
1.7.6
--
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum

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