linux-kernel - Re: [PATCHv3] mmc: block: Add single read for 4k sector cards

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Date:   Wed, 29 Jun 2022 16:18:55 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Christian Loehle <CLoehle@...erstone.com>,
        Avri Altman <Avri.Altman@....com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3] mmc: block: Add single read for 4k sector cards

On 28/06/22 16:30, Christian Loehle wrote:
> Cards with 4k native sector size may only be read 4k-aligned,
> accommodate for this in the single read recovery and use it.
> 
> Fixes: 81196976ed946 (mmc: block: Add blk-mq support)
> Signed-off-by: Christian Loehle <cloehle@...erstone.com>
> ---
>  drivers/mmc/core/block.c | 27 +++++++++++++--------------
>  1 file changed, 13 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index f4a1281658db..7b73d77687b1 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;
> @@ -1368,12 +1368,12 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
>  			brq->data.blocks--;
>  
>  		/*
> -		 * After a read error, we redo the request one sector
> +		 * After a read error, we redo the request one (native) sector
>  		 * 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 = queue_physical_block_size(mq->queue) >> 9;
>  
>  		/*
>  		 * 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 = queue_physical_block_size(mq->queue);
>  
>  	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) {

brq->data.blocks > 1 would be brq->data.blocks > 8 for mmc_large_sector, right?
I guess it doesn't matter much.

> +		/* Read one (native) sector at a time */
>  		mmc_blk_read_single(mq, req);
>  		return;
>  	}