RE: [PATCH V2] mmc: card: IOCTL support for Sanitize feature of eMMC v4.5

From: Yaniv Gardi
Date: Wed Dec 28 2011 - 10:42:31 EST

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In reply to: Kyungmin Park: "Re: [PATCH V2] mmc: card: IOCTL support for Sanitize feature of eMMC v4.5"
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Hi Kyungmin,

Probably I will split this patch into 2 dependent uploads.
Thanks,
Yaniv

= > -----Original Message-----
= > From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc-
= > owner@xxxxxxxxxxxxxxx] On Behalf Of Kyungmin Park
= > Sent: Tuesday, December 27, 2011 3:54 PM
= > To: Yaniv Gardi
= > Cc: linux-mmc@xxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; open
= > list
= > Subject: Re: [PATCH V2] mmc: card: IOCTL support for Sanitize feature
= > of eMMC v4.5
= >
= > Hi Yaniv,
= >
= > You maybe split the patch into block and mmc parts.
= > Please see the comments inlined.
= >
= > Thank you,
= > Kyungmin Park
= >
= > On Tue, Dec 27, 2011 at 10:33 PM, Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
= > wrote:
= > > Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
= > >
= > > ---
= > > block/blk-core.c | 15 ++++++++++--
= > > block/blk-lib.c | 44
= > +++++++++++++++++++++++++++++++++++++++
= > > block/blk-merge.c | 6 +++++
= > > block/elevator.c | 8 ++++++-
= > > block/ioctl.c | 9 ++++++++
= > > drivers/mmc/card/block.c | 50
= > ++++++++++++++++++++++++++++++++++++--------
= > > drivers/mmc/card/queue.c | 7 +++++-
= > > include/linux/blk_types.h | 7 ++++-
= > > include/linux/blkdev.h | 3 ++
= > > include/linux/fs.h | 1 +
= > > include/linux/mmc/card.h | 7 ++++++
= > > kernel/trace/blktrace.c | 2 +
= > > 12 files changed, 143 insertions(+), 16 deletions(-)
= > >
= > > diff --git a/block/blk-core.c b/block/blk-core.c
= > > index e6c05a9..e3512a4 100644
= > > --- a/block/blk-core.c
= > > +++ b/block/blk-core.c
= > > @@ -1544,7 +1544,7 @@ generic_make_request_checks(struct bio *bio)
= > > goto end_io;
= > > }
= > >
= > > - if (unlikely(!(bio->bi_rw & REQ_DISCARD) &&
= > > + if (unlikely(!(bio->bi_rw & (REQ_DISCARD | REQ_SANITIZE))
= > &&
= > > nr_sectors > queue_max_hw_sectors(q))) {
= > > printk(KERN_ERR "bio too big device %s (%u > %u)\n",
= > > bdevname(bio->bi_bdev, b),
= > > @@ -1592,6 +1592,14 @@ generic_make_request_checks(struct bio *bio)
= > > goto end_io;
= > > }
= > >
= > > + if ((bio->bi_rw & REQ_SANITIZE) &&
= > > + (!blk_queue_sanitize(q))) {
= > > + pr_err("%s - SANITIZE request but queue "
= > > + "doesn't support sanitize", __func__);
= > > + err = -EOPNOTSUPP;
= > > + goto end_io;
= > > + }
= > > +
= > > if (blk_throtl_bio(q, bio))
= > > return false; /* throttled, will be resubmitted
= > later */
= > >
= > > @@ -1697,7 +1705,8 @@ void submit_bio(int rw, struct bio *bio)
= > > * If it's a regular read/write or a barrier with data
= > attached,
= > > * go through the normal accounting stuff before submission.
= > > */
= > > - if (bio_has_data(bio) && !(rw & REQ_DISCARD)) {
= > > + if (bio_has_data(bio) &&
= > > + (!(rw & (REQ_DISCARD | REQ_SANITIZE)))) {
= > > if (rw & WRITE) {
= > > count_vm_events(PGPGOUT, count);
= > > } else {
= > > @@ -1743,7 +1752,7 @@ EXPORT_SYMBOL(submit_bio);
= > > */
= > > int blk_rq_check_limits(struct request_queue *q, struct request
= > *rq)
= > > {
= > > - if (rq->cmd_flags & REQ_DISCARD)
= > > + if ((rq->cmd_flags & REQ_DISCARD) || (rq->cmd_flags &
= > REQ_SANITIZE))
= > (rq->cmd_flags & (REQ_DISCARD | REA_SANITIZE))?
= > > return 0;
= > >
= > > if (blk_rq_sectors(rq) > queue_max_sectors(q) ||
= > > diff --git a/block/blk-lib.c b/block/blk-lib.c
= > > index 2b461b4..76ed930 100644
= > > --- a/block/blk-lib.c
= > > +++ b/block/blk-lib.c
= > > @@ -114,6 +114,50 @@ int blkdev_issue_discard(struct block_device
= > *bdev, sector_t sector,
= > > }
= > > EXPORT_SYMBOL(blkdev_issue_discard);
= > >
= > > +int blkdev_issue_sanitize(struct block_device *bdev, gfp_t
= > gfp_mask)
= > > +{
= > > + DECLARE_COMPLETION_ONSTACK(wait);
= > > + struct request_queue *q = bdev_get_queue(bdev);
= > > + int type = REQ_WRITE | REQ_SANITIZE;
= > > +
= > > + struct bio_batch bb;
= > > + struct bio *bio;
= > > + int ret = 0;
= > > +
= > > + if (!q)
= > > + return -ENXIO;
= > > +
= > > + bio = bio_alloc(gfp_mask, 1);
= > > + if (!bio)
= > > + return -ENOMEM;
= > > +
= > > + if (!blk_queue_sanitize(q)) {
= > > + pr_err("%s - card doesn't support sanitize",
= > __func__);
= > You should add the bio_free-like at here?
= > > + return -EOPNOTSUPP;
= > > + }
= > > +
= > > + atomic_set(&bb.done, 1);
= > > + bb.flags = 1 << BIO_UPTODATE;
= > > + bb.wait = &wait;
= > > +
= > > + bio->bi_end_io = bio_batch_end_io;
= > > + bio->bi_bdev = bdev;
= > > + bio->bi_private = &bb;
= > > +
= > > + atomic_inc(&bb.done);
= > > + submit_bio(type, bio);
= > > +
= > > + /* Wait for bios in-flight */
= > > + if (!atomic_dec_and_test(&bb.done))
= > > + wait_for_completion(&wait);
= > > +
= > > + if (!test_bit(BIO_UPTODATE, &bb.flags))
= > > + ret = -EIO;
= > > +
= > > + return ret;
= > > +}
= > > +EXPORT_SYMBOL(blkdev_issue_sanitize);
= > > +
= > > /**
= > > * blkdev_issue_zeroout - generate number of zero filed write bios
= > > * @bdev: blockdev to issue
= > > diff --git a/block/blk-merge.c b/block/blk-merge.c
= > > index cfcc37c..f3ed15b 100644
= > > --- a/block/blk-merge.c
= > > +++ b/block/blk-merge.c
= > > @@ -383,6 +383,12 @@ static int attempt_merge(struct request_queue
= > *q, struct request *req,
= > > return 0;
= > >
= > > /*
= > > + * Don't merge file system requests and sanitize requests
= > > + */
= > > + if ((req->cmd_flags & REQ_SANITIZE) != (next->cmd_flags &
= > REQ_SANITIZE))
= > > + return 0;
= > > +
= > > + /*
= > > * not contiguous
= > > */
= > > if (blk_rq_pos(req) + blk_rq_sectors(req) !=
= > blk_rq_pos(next))
= > > diff --git a/block/elevator.c b/block/elevator.c
= > > index 99838f4..4255dd9 100644
= > > --- a/block/elevator.c
= > > +++ b/block/elevator.c
= > > @@ -88,6 +88,12 @@ int elv_rq_merge_ok(struct request *rq, struct
= > bio *bio)
= > > return 0;
= > >
= > > /*
= > > + * Don't merge sanitize requests
= > > + */
= > > + if ((bio->bi_rw & REQ_SANITIZE) != (rq->bio->bi_rw &
= > REQ_SANITIZE))
= > > + return 0;
= > > +
= > > + /*
= > > * different data direction or already started, don't merge
= > > */
= > > if (bio_data_dir(bio) != rq_data_dir(rq))
= > > @@ -647,7 +653,7 @@ void __elv_add_request(struct request_queue *q,
= > struct request *rq, int where)
= > > if (rq->cmd_flags & REQ_SOFTBARRIER) {
= > > /* barriers are scheduling boundary, update
= > end_sector */
= > > if (rq->cmd_type == REQ_TYPE_FS ||
= > > - (rq->cmd_flags & REQ_DISCARD)) {
= > > + (rq->cmd_flags & (REQ_DISCARD | REQ_SANITIZE)))
= > {
= > > q->end_sector = rq_end_sector(rq);
= > > q->boundary_rq = rq;
= > > }
= > > diff --git a/block/ioctl.c b/block/ioctl.c
= > > index ca939fc..112215d 100644
= > > --- a/block/ioctl.c
= > > +++ b/block/ioctl.c
= > > @@ -132,6 +132,11 @@ static int blk_ioctl_discard(struct
= > block_device *bdev, uint64_t start,
= > > return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
= > flags);
= > > }
= > >
= > > +static int blk_ioctl_sanitize(struct block_device *bdev)
= > > +{
= > > + return blkdev_issue_sanitize(bdev, GFP_KERNEL);
= > > +}
= > > +
= > > static int put_ushort(unsigned long arg, unsigned short val)
= > > {
= > > return put_user(val, (unsigned short __user *)arg);
= > > @@ -216,6 +221,10 @@ int blkdev_ioctl(struct block_device *bdev,
= > fmode_t mode, unsigned cmd,
= > > set_device_ro(bdev, n);
= > > return 0;
= > >
= > > + case BLKSANITIZE:
= > > + ret = blk_ioctl_sanitize(bdev);
= > > + break;
= > > +
= > > case BLKDISCARD:
= > > case BLKSECDISCARD: {
= > > uint64_t range[2];
= > > diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
= > > index 0c959c9..06561b9 100644
= > > --- a/drivers/mmc/card/block.c
= > > +++ b/drivers/mmc/card/block.c
= > > @@ -868,18 +868,11 @@ 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 +915,40 @@ 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))) {
= > > + pr_err("%s: SANITIZE is not supported", __func__);
= > > + err = -EOPNOTSUPP;
= > > + goto out;
= > > + }
= > > +
= > > + pr_debug("%s: SANITIZE is supported", __func__);
= > > +
= > > + mmc_sd_card_set_sanitize_in_progress(card);
= > > +
= > > + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
= > > + EXT_CSD_SANITIZE_START, 1,
= > 0);
= > > +
= > > + if (err)
= > > + pr_err("%s: mmcblk: mmc_switch() failed. err=%d\n",
= > > + __func__, err);
= > > +
= > > + 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 +1406,12 @@ 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 */
= > > + 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 dcad59c..642a80d 100644
= > > --- a/drivers/mmc/card/queue.c
= > > +++ b/drivers/mmc/card/queue.c
= > > @@ -140,7 +140,7 @@ 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);
= > Please add the QUEUE_FLAG_SANITIZE at here as other.
= > > }
= > >
= > > @@ -181,6 +181,11 @@ 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))
= > > + queue_flag_set_unlocked(QUEUE_FLAG_SANITIZE, mq-
= > >queue);
= > > + else
= > > + pr_info("%s - card doesn't support sanitize",
= > __func__);
= > Please move to it as above
= > > +
= > > #ifdef CONFIG_MMC_BLOCK_BOUNCE
= > > if (host->max_segs == 1) {
= > > unsigned int bouncesz;
= > > diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
= > > index 4053cbd..826c724 100644
= > > --- a/include/linux/blk_types.h
= > > +++ b/include/linux/blk_types.h
= > > @@ -150,6 +150,7 @@ enum rq_flag_bits {
= > > __REQ_FLUSH_SEQ, /* request for flush sequence */
= > > __REQ_IO_STAT, /* account I/O stat */
= > > __REQ_MIXED_MERGE, /* merge of different types, fail
= > separately */
= > > + __REQ_SANITIZE, /* sanitize */
= > > __REQ_NR_BITS, /* stops here */
= > > };
= > >
= > > @@ -161,13 +162,15 @@ enum rq_flag_bits {
= > > #define REQ_META (1 << __REQ_META)
= > > #define REQ_PRIO (1 << __REQ_PRIO)
= > > #define REQ_DISCARD (1 << __REQ_DISCARD)
= > > +#define REQ_SANITIZE (1 << __REQ_SANITIZE)
= > > #define REQ_NOIDLE (1 << __REQ_NOIDLE)
= > >
= > > #define REQ_FAILFAST_MASK \
= > > (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
= > REQ_FAILFAST_DRIVER)
= > > #define REQ_COMMON_MASK \
= > > (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META |
= > REQ_PRIO | \
= > > - REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA |
= > REQ_SECURE)
= > > + REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA |
= > REQ_SECURE | \
= > > + REQ_SANITIZE)
= > > #define REQ_CLONE_MASK REQ_COMMON_MASK
= > >
= > > #define REQ_RAHEAD (1 << __REQ_RAHEAD)
= > > @@ -192,4 +195,4 @@ enum rq_flag_bits {
= > > #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
= > > #define REQ_SECURE (1 << __REQ_SECURE)
= > >
= > > -#endif /* __LINUX_BLK_TYPES_H */
= > > +#endif /* __LINUX_REQ__TYPES_H */
= > Why do you change this one?
= > > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
= > > index 7084318..1197c31 100644
= > > --- a/include/linux/blkdev.h
= > > +++ b/include/linux/blkdev.h
= > > @@ -423,6 +423,7 @@ struct request_queue {
= > > #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random
= > pool */
= > > #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
= > > #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same
= > CPU */
= > > +#define QUEUE_FLAG_SANITIZE 19 /* supports SANITIZE */
= > >
= > > #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) |
= > \
= > > (1 << QUEUE_FLAG_STACKABLE) |
= > \
= > > @@ -506,6 +507,7 @@ static inline void queue_flag_clear(unsigned
= > int flag, struct request_queue *q)
= > > #define blk_queue_stackable(q) \
= > > test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
= > > #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)-
= > >queue_flags)
= > > +#define blk_queue_sanitize(q) test_bit(QUEUE_FLAG_SANITIZE, &(q)-
= > >queue_flags)
= > > #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
= > > test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
= > >
= > > @@ -955,6 +957,7 @@ static inline struct request
= > *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
= > > extern int blkdev_issue_flush(struct block_device *, gfp_t,
= > sector_t *);
= > > extern int blkdev_issue_discard(struct block_device *bdev,
= > sector_t sector,
= > > sector_t nr_sects, gfp_t gfp_mask, unsigned long
= > flags);
= > > +extern int blkdev_issue_sanitize(struct block_device *bdev, gfp_t
= > gfp_mask);
= > > extern int blkdev_issue_zeroout(struct block_device *bdev,
= > sector_t sector,
= > > sector_t nr_sects, gfp_t gfp_mask);
= > > static inline int sb_issue_discard(struct super_block *sb,
= > sector_t block,
= > > diff --git a/include/linux/fs.h b/include/linux/fs.h
= > > index 057434a..3680eef 100644
= > > --- a/include/linux/fs.h
= > > +++ b/include/linux/fs.h
= > > @@ -319,6 +319,7 @@ struct inodes_stat_t {
= > > #define BLKPBSZGET _IO(0x12,123)
= > > #define BLKDISCARDZEROES _IO(0x12,124)
= > > #define BLKSECDISCARD _IO(0x12,125)
= > > +#define BLKSANITIZE _IO(0x12, 126)
= > >
= > > #define BMAP_IOCTL 1 /* obsolete - kept for
= > compatibility */
= > > #define FIBMAP _IO(0x00,1) /* bmap access */
= > > 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/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
= > > index 16fc34a..2c2efc6 100644
= > > --- a/kernel/trace/blktrace.c
= > > +++ b/kernel/trace/blktrace.c
= > > @@ -1802,6 +1802,8 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int
= > bytes)
= > > rwbs[i++] = 'W';
= > > else if (rw & REQ_DISCARD)
= > > rwbs[i++] = 'D';
= > > + else if (rw & REQ_SANITIZE)
= > > + rwbs[i++] = 'Z';
= > > else if (bytes)
= > > rwbs[i++] = 'R';
= > > else
= > > --
= > > 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
= > > --
= > > To unsubscribe from this list: send the line "unsubscribe linux-
= > mmc" in
= > > the body of a message to majordomo@xxxxxxxxxxxxxxx
= > > More majordomo info at http://vger.kernel.org/majordomo-info.html
= > --
= > To unsubscribe from this list: send the line "unsubscribe linux-mmc"
= > in
= > the body of a message to majordomo@xxxxxxxxxxxxxxx
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