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

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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
> --
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> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum
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