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

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Message-ID: <9261a62d-e496-ba2b-74f4-627e0a5e6abe@intel.com>
Date:   Mon, 9 May 2022 13:03:21 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Sajida Bhanu (Temp)" <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 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;
		}
	}

> 
> 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);
>>>