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 15:14:08 +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

Hi,

Thank you for review.

Please find the inline comments.

Thanks,

Sajida

On 4/26/2022 1:28 PM, Adrian Hunter wrote:
> On 26/04/22 10:54, 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
>>
>>> +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");
> Also, if possible, please use DEFINE_DEBUGFS_ATTRIBUTE / debugfs_create_file_unsafe
> in this case
Sure.. will use  DEFINE_DEBUGFS_ATTRIBUTE
>
>>>   
>>>   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);
>>>