Re: [PATCH V6 1/5] mmc: core: Capture eMMC and SD card errors

["Sajida Bhanu (Temp)" <quic_c_sbhanu@quicinc.com>]

On 5/23/2022 12:44 PM, Adrian Hunter wrote:
> On 18/05/22 10:02, Shaik Sajida Bhanu wrote:
>> Add changes to capture eMMC and SD card errors.
>> This is useful for debug and testing.
>>
>> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
>> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
>> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
>> Signed-off-by: Ram Prakash Gupta <quic_rampraka@quicinc.com>
>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
> Seems to need to be re-based on Ulf's next branch:
>
> 	git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next
Sure Thank You for the review.
>
> Otherwise:
>
> Acked-by: Adrian Hunter <adrian.hunter@intel.com>
>
>> ---
>>   drivers/mmc/core/core.c  | 10 +++++++++-
>>   include/linux/mmc/host.h | 26 ++++++++++++++++++++++++++
>>   2 files changed, 35 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index 368f104..5db5adf 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -943,9 +943,11 @@ int mmc_execute_tuning(struct mmc_card *card)
>>   	}
>>   
>>   	/* Only print error when we don't check for card removal */
>> -	if (!host->detect_change)
>> +	if (!host->detect_change) {
>>   		pr_err("%s: tuning execution failed: %d\n",
>>   			mmc_hostname(host), err);
>> +		mmc_debugfs_err_stats_inc(host, MMC_ERR_TUNING);
>> +	}
>>   
>>   	return err;
>>   }
>> @@ -2242,6 +2244,12 @@ void mmc_rescan(struct work_struct *work)
>>   		if (freqs[i] <= host->f_min)
>>   			break;
>>   	}
>> +
>> +	/*
>> +	 * Ignore the command timeout errors observed during
>> +	 * the card init as those are excepted.
>> +	 */
>> +	host->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;
>>   	mmc_release_host(host);
>>   
>>    out:
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index 0c0c9a0..0d7c0f7 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -93,6 +93,25 @@ struct mmc_clk_phase_map {
>>   
>>   struct mmc_host;
>>   
>> +enum mmc_err_stat {
>> +	MMC_ERR_CMD_TIMEOUT,
>> +	MMC_ERR_CMD_CRC,
>> +	MMC_ERR_DAT_TIMEOUT,
>> +	MMC_ERR_DAT_CRC,
>> +	MMC_ERR_AUTO_CMD,
>> +	MMC_ERR_ADMA,
>> +	MMC_ERR_TUNING,
>> +	MMC_ERR_CMDQ_RED,
>> +	MMC_ERR_CMDQ_GCE,
>> +	MMC_ERR_CMDQ_ICCE,
>> +	MMC_ERR_REQ_TIMEOUT,
>> +	MMC_ERR_CMDQ_REQ_TIMEOUT,
>> +	MMC_ERR_ICE_CFG,
>> +	MMC_ERR_CTRL_TIMEOUT,
>> +	MMC_ERR_UNEXPECTED_IRQ,
>> +	MMC_ERR_MAX,
>> +};
>> +
>>   struct mmc_host_ops {
>>   	/*
>>   	 * It is optional for the host to implement pre_req and post_req in
>> @@ -498,6 +517,7 @@ struct mmc_host {
>>   	/* Host Software Queue support */
>>   	bool			hsq_enabled;
>>   
>> +	u32			err_stats[MMC_ERR_MAX];
>>   	unsigned long		private[] ____cacheline_aligned;
>>   };
>>   
>> @@ -632,6 +652,12 @@ static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data)
>>   	return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
>>   }
>>   
>> +static inline void mmc_debugfs_err_stats_inc(struct mmc_host *host,
>> +					     enum mmc_err_stat stat)
>> +{
>> +	host->err_stats[stat] += 1;
>> +}
>> +
>>   int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error);
>>   int mmc_send_abort_tuning(struct mmc_host *host, u32 opcode);
>>