From a2fc65508912792255df4b40eabc2bdb6b2fe9ee Mon Sep 17 00:00:00 2001 From: Maya Erez Date: Thu, 24 May 2012 23:46:29 +0300 Subject: [PATCH] mmc: card: Adding support for sanitize in eMMC 4.5 This feature delete 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 were previously deleted (by erase, trim or discard operation) Change-Id: I7f1df8e87fb782979fd90e064eca00704caca54b Signed-off-by: Yaniv Gardi Signed-off-by: Maya Erez --- drivers/mmc/card/block.c | 72 +++++++++++++++++++++++++++++----------- drivers/mmc/card/queue.c | 10 +++++- include/linux/mmc/host.h | 1 + 3 files changed, 62 insertions(+), 21 deletions(-) diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index 4dc30d52a87..9f5e5856359 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -873,10 +873,10 @@ 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; } @@ -884,23 +884,10 @@ 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_erase_group_aligned(card, from, nr)) - arg = erase_arg; - else if (mmc_can_trim(card)) - arg = trim_arg; - else { - err = -EINVAL; - goto out; - } + if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) + arg = MMC_SECURE_TRIM1_ARG; + else + arg = MMC_SECURE_ERASE_ARG; retry: if (card->quirks & MMC_QUIRK_INAND_CMD38) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, @@ -952,6 +939,46 @@ out: return err ? 0 : 1; } +static 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; + + BUG_ON(!card); + BUG_ON(!card->host); + + if (!(mmc_can_sanitize(card) && + (card->host->caps2 & MMC_CAP2_SANITIZE))) { + pr_warning("%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, 0); + + if (err) + pr_err("%s: %s - mmc_switch() with " + "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: + 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; @@ -1433,7 +1460,12 @@ 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 sanitize */ + 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); diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c index 996f8e36e23..f60ea693f1a 100644 --- a/drivers/mmc/card/queue.c +++ b/drivers/mmc/card/queue.c @@ -145,10 +145,15 @@ 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 @@ -186,6 +191,9 @@ 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); + #ifdef CONFIG_MMC_BLOCK_BOUNCE if (host->max_segs == 1) { unsigned int bouncesz; diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index a67e7d165cc..c9b524c473d 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -244,6 +244,7 @@ struct mmc_host { #define MMC_CAP2_PACKED_WR (1 << 11) /* Allow packed write */ #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \ MMC_CAP2_PACKED_WR) /* Allow packed commands */ +#define MMC_CAP2_SANITIZE (1 << 13) /* Support Sanitize */ mmc_pm_flag_t pm_caps; /* supported pm features */ unsigned int power_notify_type; #define MMC_HOST_PW_NOTIFY_NONE 0