linux-kernel - Re: [PATCH V3 3/4] mmc: core: Capture eMMC and SD card errors

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Message-ID: <2989ff51-374e-3ab5-f8d4-19e0a1873a66@intel.com>
Date:   Fri, 21 Jan 2022 10:20:09 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        quic_asutoshd@...cinc.com, ulf.hansson@...aro.org,
        agross@...nel.org, bjorn.andersson@...aro.org,
        linux-mmc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     stummala@...eaurora.org, vbadigan@...eaurora.org,
        quic_rampraka@...cinc.com, quic_pragalla@...cinc.com,
        sartgarg@...eaurora.org, nitirawa@...eaurora.org,
        sayalil@...eaurora.org, Liangliang Lu <luliang@...eaurora.org>,
        "Bao D . Nguyen" <nguyenb@...eaurora.org>
Subject: Re: [PATCH V3 3/4] mmc: core: Capture eMMC and SD card errors

On 20/01/2022 19:26, Shaik Sajida Bhanu wrote:
> Add changes to capture eMMC and SD card errors.
> This is useful for debug and testing.
> 
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> Signed-off-by: Liangliang Lu <luliang@...eaurora.org>
> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
> Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
> Signed-off-by: Ram Prakash Gupta <quic_rampraka@...cinc.com>
> ---
>  drivers/mmc/core/core.c  | 8 ++++++++
>  drivers/mmc/core/queue.c | 3 +++
>  2 files changed, 11 insertions(+)
> 
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 368f104..c586d69 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2242,6 +2242,14 @@ void mmc_rescan(struct work_struct *work)
>  		if (freqs[i] <= host->f_min)
>  			break;
>  	}
> +
> +	/*
> +	 * Ignore the command timeout errors observed during
> +	 * the card init as those are excepted.
> +	 */
> +

Please remove blank line here.

> +	if (host && host->err_stats_enabled)

The condition is not needed.

> +		host->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;

Please put this after successful call to mmc_rescan_try_freq

>  	mmc_release_host(host);
>  
>   out:
> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
> index c69b2d9..7dc9dfb 100644
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -100,6 +100,9 @@ static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
>  	enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
>  	bool recovery_needed = false;
>  
> +	if (host->err_stats_enabled)
> +		mmc_debugfs_err_stats_inc(host, MMC_ERR_CMDQ_REQ_TIMEOUT);

Doesn't this get covered by the drivers.  It seems like this should not be needed.

> +
>  	switch (issue_type) {
>  	case MMC_ISSUE_ASYNC:
>  	case MMC_ISSUE_DCMD:
>