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

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Date:   Mon, 9 May 2022 16:02:19 +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>,
        <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 5/9/2022 3:33 PM, Adrian Hunter wrote:
> On 9/05/22 12:42, Sajida Bhanu (Temp) wrote:
>> Hi,
>>
>> Thank you for the review.
>>
>> Please find the inline comments.
>>
>> Thanks,
>>
>> Sajida
>>
>> On 4/26/2022 1:24 PM, Adrian Hunter wrote:
>>
>>> 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
>> Sure
>>>> +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.
>> MMC_ERR_ICE_CFG --> we don't have ICE config.
> So err_stats[MMC_ERR_ICE_CFG]  would be zero and make
> no difference.
>
> If you are going to check all then you could loop
> through them
>
> 	*val = 0;
> 	for (i = 0; i < MMC_ERR_MAX; i++) {
> 		if (host->err_stats[i]) {
> 			*val = 1;
> 			break;
> 		}
> 	}
Sure Thanks
>> Remaining we need to update, Thank you for pointing.
>>
>>>> +	*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);
>>>>