Re: [PATCH RESEND v8 2/2] mmc: card: Adding support for sanitize in eMMC 4.5

[merez@codeaurora.org]

Looks good to me.
Reviewed-by: Maya Erez <merez@codeaurora.org>

On Wed, July 25, 2012 4:31 am, Yaniv Gardi wrote:
> 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)
>
> Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
>
> ---
>  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 f1c84de..c45ec9f 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -860,10 +860,10 @@ 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;
>  	}
> @@ -871,23 +871,10 @@ 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,
> @@ -937,6 +924,46 @@ 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;
> @@ -1407,7 +1434,12 @@ 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 e360a97..4f3250e 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
> @@ -184,6 +189,9 @@ 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 f578a71..84d1b82 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -257,6 +257,7 @@ struct mmc_host {
>  #define MMC_CAP2_HC_ERASE_SZ	(1 << 9)	/* High-capacity erase size */
>  #define MMC_CAP2_CD_ACTIVE_HIGH	(1 << 10)	/* Card-detect signal active
> high */
>  #define MMC_CAP2_RO_ACTIVE_HIGH	(1 << 11)	/* Write-protect signal active
> high */
> +#define MMC_CAP2_SANITIZE	(1 << 12)		/* 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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-- 
Sent by consultant of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum