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Date:	Sun, 26 Feb 2012 11:37:05 +0200
From:	"Yaniv Gardi" <ygardi@...eaurora.org>
To:	"'Jaehoon Chung'" <jh80.chung@...sung.com>
Cc:	<linux-mmc@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	<axboe@...nel.dk>, "'open list'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 2/2] mmc: card: Adding support for Sanitize in eMMC v4.5



= > -----Original Message-----
= > From: Jaehoon Chung [mailto:jh80.chung@...sung.com]
= > Sent: Wednesday, February 22, 2012 8:09 AM
= > To: Yaniv Gardi
= > Cc: linux-mmc@...r.kernel.org; linux-arm-msm@...r.kernel.org;
= > axboe@...nel.dk; open list
= > Subject: Re: [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@...eaurora.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)?

No. it should be (!(A & B)). Since (A & B) means there is a support in
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..

Printout Removed.


= > 
= > > +
= > > +	if (err)
= > > +		pr_err("%s: mmcblk: mmc_switch() failed. err=%d\n",
= > > +		       __func__, err);
= > 
= > how about using mmcblkX instead of just mmcblk?

Ok. I changed it to mmc%d

= > 
= > > +
= > > +	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.

Typo fixed.

= > 
= > > +		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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