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

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Date:   Tue, 24 May 2022 10:49:32 +0530
From:   "Sajida Bhanu (Temp)" <quic_c_sbhanu@...cinc.com>
To:     Adrian Hunter <adrian.hunter@...el.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

Hi Adrian,

Thanks for the review.

Please find the inline comments.

Thanks,

Sajida

On 5/23/2022 12:45 PM, Adrian Hunter wrote:
> 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>
Sure Thank you
>
>> ---
>>   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()
Sure
>
>>   	debugfs_create_file("err_stats", 0600, root, host,
>>   			    &mmc_err_stats_fops);
>>