linux-kernel - Re: [PATCH 1/2] mmc: block: Issue flush only if allowed

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Date:   Mon, 22 Mar 2021 20:00:02 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Avri Altman <avri.altman@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Brendan Peter <bpeter@...x.com>
Subject: Re: [PATCH 1/2] mmc: block: Issue flush only if allowed

On 22/03/21 3:36 pm, Avri Altman wrote:
> The cache may be flushed to the nonvolatile storage by writing to
> FLUSH_CACHE byte (EXT_CSD byte [32]). When in command queueing mode, the
> cache may be flushed by issuing a CMDQ_TASK_ DEV_MGMT (CMD48) with a
> FLUSH_CACHE op-code.  Either way, verify that The cache function is
> turned ON before doing so.
> 
> fixes: 1e8e55b67030 (mmc: block: Add CQE support)
> 
> Reported-by: Brendan Peter <bpeter@...x.com>
> Tested-by: Brendan Peter <bpeter@...x.com>
> Signed-off-by: Avri Altman <avri.altman@....com>
> ---
>  drivers/mmc/core/block.c   | 3 +++
>  drivers/mmc/core/mmc_ops.c | 4 +---
>  drivers/mmc/core/mmc_ops.h | 5 +++++
>  3 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 42e27a298218..a93c66aa91db 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -1473,6 +1473,9 @@ static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
>  	struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
>  	struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
>  
> +	if (mmc_card_mmc(mq->card) && !mmc_flush_allowed(mq->card))
> +		return 0;

Returning 0 means the flush was issued successfully. i.e. it is in
flight.

Instead, a call to blk_mq_end_request(req, BLK_STS_OK) is needed,
and mmc_blk_mq_issue_rq() must be amended so that it will return
MMC_REQ_DONE for this case.

> +
>  	mrq->cmd->opcode = MMC_SWITCH;
>  	mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
>  			(EXT_CSD_FLUSH_CACHE << 16) |
> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index baa6314f69b4..b8a0c9ac8a20 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -988,9 +988,7 @@ int mmc_flush_cache(struct mmc_card *card)
>  {
>  	int err = 0;
>  
> -	if (mmc_card_mmc(card) &&
> -			(card->ext_csd.cache_size > 0) &&
> -			(card->ext_csd.cache_ctrl & 1)) {
> +	if (mmc_card_mmc(card) && mmc_flush_allowed(card)) {
>  		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>  				 EXT_CSD_FLUSH_CACHE, 1,
>  				 MMC_CACHE_FLUSH_TIMEOUT_MS);
> diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
> index 632009260e51..bf2b315addd7 100644
> --- a/drivers/mmc/core/mmc_ops.h
> +++ b/drivers/mmc/core/mmc_ops.h
> @@ -19,6 +19,11 @@ enum mmc_busy_cmd {
>  struct mmc_host;
>  struct mmc_card;
>  
> +static inline bool mmc_flush_allowed(struct mmc_card *card)
> +{
> +	return card->ext_csd.cache_size > 0 && (card->ext_csd.cache_ctrl & 1);
> +}
> +
>  int mmc_select_card(struct mmc_card *card);
>  int mmc_deselect_cards(struct mmc_host *host);
>  int mmc_set_dsr(struct mmc_host *host);
>