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SubjectRE: [PATCH v3 2/2] mmc: card: Adding support for Sanitize in eMMC v4.5
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= > -----Original Message-----
= > From: Jaehoon Chung [mailto:jh80.chung@samsung.com]
= > Sent: Wednesday, February 22, 2012 8:09 AM
= > To: Yaniv Gardi
= > Cc: linux-mmc@vger.kernel.org; linux-arm-msm@vger.kernel.org;
= > axboe@kernel.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@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)?

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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