linux-kernel - Re: [PATCH V4 1/7] mmc: core: Capture eMMC and SD card errors

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Message-ID: <c33540bc-0466-5a28-c85d-bfc8934b8c15@intel.com>
Date:   Tue, 8 Mar 2022 11:44:30 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        quic_riteshh@...cinc.com, 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:     quic_vbadigan@...cinc.com, quic_rampraka@...cinc.com,
        quic_pragalla@...cinc.com, quic_sartgarg@...cinc.com,
        quic_nitirawa@...cinc.com, quic_sayalil@...cinc.com,
        Liangliang Lu <quic_luliang@...cinc.com>,
        "Bao D . Nguyen" <quic_nguyenb@...cinc.com>
Subject: Re: [PATCH V4 1/7] mmc: core: Capture eMMC and SD card errors

On 2.3.2022 15.03, Shaik Sajida Bhanu wrote:
> Add changes to capture eMMC and SD card errors.
> This is useful for debug and testing.
> 
> Signed-off-by: Liangliang Lu <quic_luliang@...cinc.com>
> Signed-off-by: Sayali Lokhande <quic_sayalil@...cinc.com>
> Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
> Signed-off-by: Ram Prakash Gupta <quic_rampraka@...cinc.com>
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> ---
>  drivers/mmc/core/core.c  |  6 ++++++
>  include/linux/mmc/host.h | 23 +++++++++++++++++++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 368f104..f3679ed 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2242,6 +2242,12 @@ 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.
> +	 */
> +	host->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;
>  	mmc_release_host(host);
>  
>   out:
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 7afb57c..3b7f1e5 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -93,6 +93,23 @@ struct mmc_clk_phase_map {
>  
>  struct mmc_host;
>  
> +enum mmc_err_stat {
> +	MMC_ERR_CMD_TIMEOUT,
> +	MMC_ERR_CMD_CRC,
> +	MMC_ERR_DAT_TIMEOUT,
> +	MMC_ERR_DAT_CRC,
> +	MMC_ERR_AUTO_CMD,
> +	MMC_ERR_ADMA,
> +	MMC_ERR_TUNING,
> +	MMC_ERR_CMDQ_RED,
> +	MMC_ERR_CMDQ_GCE,
> +	MMC_ERR_CMDQ_ICCE,
> +	MMC_ERR_REQ_TIMEOUT,
> +	MMC_ERR_CMDQ_REQ_TIMEOUT,
> +	MMC_ERR_ICE_CFG,
> +	MMC_ERR_MAX,
> +};
> +
>  struct mmc_host_ops {
>  	/*
>  	 * It is optional for the host to implement pre_req and post_req in
> @@ -500,6 +517,7 @@ struct mmc_host {
>  
>  	/* Host Software Queue support */
>  	bool			hsq_enabled;
> +	u32                     err_stats[MMC_ERR_MAX];

This makes it look like err_stats has something to do with Host Software Queue.
Perhaps move it to be with debugfs_root. Also use tabs not spaces

	struct dentry		*debugfs_root;
	u32			err_stats[MMC_ERR_MAX];

>  
>  	unsigned long		private[] ____cacheline_aligned;
>  };
> @@ -635,6 +653,11 @@ static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data)
>  	return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
>  }
>  
> +static inline void mmc_debugfs_err_stats_inc(struct mmc_host *host,
> +		enum mmc_err_stat stat) {
> +	host->err_stats[stat] += 1;
> +}
> +
>  int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error);
>  int mmc_send_abort_tuning(struct mmc_host *host, u32 opcode);
>  int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd);