linux-kernel - Re: [PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

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Date:   Tue, 26 Apr 2022 10:54:34 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        ulf.hansson@...aro.org, wsa+renesas@...g-engineering.com,
        yoshihiro.shimoda.uh@...esas.com, linus.walleij@...aro.org,
        digetx@...il.com, briannorris@...omium.org,
        quic_riteshh@...cinc.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_asutoshd@...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 V5 4/5] mmc: debugfs: Add debug fs error state entry for
 mmc driver

On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
> Add debug fs entry error state to query eMMC and SD card errors statistics.
> If any errors occurred in eMMC and SD card driver level then
> err_state value will be set to 1.
> 
> 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: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> ---
>  drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 6aa5a60..2f5b63f 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
>  
>  DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
>  	"%llu\n");

A blank line would be nice here

> +static int mmc_err_state_get(void *data, u64 *val)
> +{
> +	struct mmc_host *host = data;
> +
> +	if (!host)
> +		return -EINVAL;
> +

I am not sure why you have left out some err_stats[].
Why not all of them?  At least, it needs a comment to explain.

> +	*val = host->err_stats[MMC_ERR_REQ_TIMEOUT] ||
> +	       host->err_stats[MMC_ERR_ADMA] ||
> +	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
> +	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
> +	       host->err_stats[MMC_ERR_CMDQ_RED] ||
> +	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
> +	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
> +	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
> +	       host->err_stats[MMC_ERR_DAT_CRC] ||
> +	       host->err_stats[MMC_ERR_CMD_CRC] ||
> +	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
> +
> +	return 0;
> +}
> +
> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
>  
>  static int mmc_err_stats_show(struct seq_file *file, void *data)
>  {
> @@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>  	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
>  				   &mmc_clock_fops);
>  
> +	debugfs_create_file("err_state", 0600, root, host,
> +			    &mmc_err_state);
>  	debugfs_create_file("err_stats", 0600, root, host,
>  			    &mmc_err_stats_fops);
>