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SubjectRe: [PATCH v3 2/2] mmc: card: Adding support for Sanitize in eMMC v4.5
On 02/21/2012 11:00 PM, Yaniv Gardi wrote:

> 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))) {

if (!mmc_can_sanitize(card) && 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__);

Too many pr_info()..i think that need not the message..

> +
> + if (err)
> + pr_err("%s: mmcblk: mmc_switch() failed. err=%d\n",
> + __func__, err);

how about using mmcblkX instead of just mmcblk?

> +
> + 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 */

Issuing Sanitize, not discard. typo.

> + 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;




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