linux-kernel - Re: [PATCH V6 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

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Date:   Mon, 23 May 2022 10:15:45 +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,
        shawn.lin@...k-chips.com, yoshihiro.shimoda.uh@...esas.com,
        digetx@...il.com, quic_asutoshd@...cinc.com
Cc:     linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, 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 V6 4/5] mmc: debugfs: Add debug fs error state entry for
 mmc driver

On 18/05/22 10:02, 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>

Could use debugfs_create_file_unsafe() (see below)

Otherwise:

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/core/debugfs.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 6aa5a60..3c7908d 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -223,6 +223,27 @@ 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");
>  
> +static int mmc_err_state_get(void *data, u64 *val)
> +{
> +	struct mmc_host *host = data;
> +	int i;
> +
> +	if (!host)
> +		return -EINVAL;
> +
> +	*val = 0;
> +	for (i = 0; i < MMC_ERR_MAX; i++) {
> +		if (host->err_stats[i]) {
> +			*val = 1;
> +			break;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
> +
>  static int mmc_err_stats_show(struct seq_file *file, void *data)
>  {
>  	struct mmc_host *host = (struct mmc_host *)file->private;
> @@ -289,6 +310,8 @@ 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);

This could use debugfs_create_file_unsafe()

>  	debugfs_create_file("err_stats", 0600, root, host,
>  			    &mmc_err_stats_fops);
>