Re: [PATCHv2] mmc: block: Add single read for 4k sector cards

Adrian Hunter
2022-06-28T07:56:34Z

On 24/06/22 18:29, Christian Löhle wrote:
> Cards with 4k native sector size may only be read 4k-aligned,
> accommodate for this in the single read recovery and use it.

Thanks for the patch.

>
> Fixes: 81196976ed946 (mmc: block: Add blk-mq support)
> Signed-off-by: Christian Loehle <cloehle@hyperstone.com>

FYI checkpatch says:

WARNING: From:/Signed-off-by: email name mismatch: 'From: "Christian Löhle" <CLoehle@hyperstone.com>' != 'Signed-off-by: Christian Loehle <cloehle@hyperstone.com>'

> ---
> drivers/mmc/core/block.c | 25 ++++++++++++-------------
> 1 file changed, 12 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index f4a1281658db..a75a208ce203 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -176,7 +176,7 @@ static inline int mmc_blk_part_switch(struct mmc_card *card,
> unsigned int part_type);
> static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> struct mmc_card *card,
> - int disable_multi,
> + int recovery_mode,
> struct mmc_queue *mq);
> static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
>
> @@ -1302,7 +1302,7 @@ static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
> }
>
> static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
> - int disable_multi, bool *do_rel_wr_p,
> + int recovery_mode, bool *do_rel_wr_p,
> bool *do_data_tag_p)
> {
> struct mmc_blk_data *md = mq->blkdata;
> @@ -1372,8 +1372,8 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
> * at a time in order to accurately determine which
> * sectors can be read successfully.
> */
> - if (disable_multi)
> - brq->data.blocks = 1;
> + if (recovery_mode)
> + brq->data.blocks = mmc_large_sector(card) ? 8 : 1;

I suggest changing to use queue_physical_block_size() here and further below

brq->data.blocks = queue_physical_block_size(req->q) >> SECTOR_SHIFT;

>
> /*
> * Some controllers have HW issues while operating
> @@ -1590,7 +1590,7 @@ static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
>
> static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> struct mmc_card *card,
> - int disable_multi,
> + int recovery_mode,
> struct mmc_queue *mq)
> {
> u32 readcmd, writecmd;
> @@ -1599,7 +1599,7 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
> struct mmc_blk_data *md = mq->blkdata;
> bool do_rel_wr, do_data_tag;
>
> - mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
> + mmc_blk_data_prep(mq, mqrq, recovery_mode, &do_rel_wr, &do_data_tag);
>
> brq->mrq.cmd = &brq->cmd;
>
> @@ -1690,7 +1690,7 @@ static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
>
> #define MMC_READ_SINGLE_RETRIES 2
>
> -/* Single sector read during recovery */
> +/* Single (native) sector read during recovery */
> static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
> {
> struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
> @@ -1698,6 +1698,7 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
> struct mmc_card *card = mq->card;
> struct mmc_host *host = card->host;
> blk_status_t error = BLK_STS_OK;
> + size_t bytes_per_read = mmc_large_sector(card) ? 4096 : 512;

size_t bytes_per_read = queue_physical_block_size(req->q);

>
> do {
> u32 status;
> @@ -1732,13 +1733,13 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
> else
> error = BLK_STS_OK;
>
> - } while (blk_update_request(req, error, 512));
> + } while (blk_update_request(req, error, bytes_per_read));
>
> return;
>
> error_exit:
> mrq->data->bytes_xfered = 0;
> - blk_update_request(req, BLK_STS_IOERR, 512);
> + blk_update_request(req, BLK_STS_IOERR, bytes_per_read);
> /* Let it try the remaining request again */
> if (mqrq->retries > MMC_MAX_RETRIES - 1)
> mqrq->retries = MMC_MAX_RETRIES - 1;
> @@ -1879,10 +1880,8 @@ static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
> return;
> }
>
> - /* FIXME: Missing single sector read for large sector size */
> - if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
> - brq->data.blocks > 1) {
> - /* Read one sector at a time */
> + if (rq_data_dir(req) == READ && brq->data.blocks > 1) {
> + /* Read one (native) sector at a time */
> mmc_blk_read_single(mq, req);
> return;
> }