linux-kernel - Re: [PATCH v1 12/12] scsi: ufs: Improve fatal error logs

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Message-ID: <95884c970ff59a6421272cac13264483@codeaurora.org>
Date:   Mon, 12 Dec 2016 17:38:54 -0800
From:   Subhash Jadavani <subhashj@...eaurora.org>
To:     Joe Perches <joe@...ches.com>
Cc:     vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        Dolev Raviv <draviv@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-scsi-owner@...r.kernel.org
Subject: Re: [PATCH v1 12/12] scsi: ufs: Improve fatal error logs

On 2016-12-12 17:19, Joe Perches wrote:
> On Mon, 2016-12-12 at 16:56 -0800, Subhash Jadavani wrote:
>> Errors such as UIC error, illegal OCS values, and others may require
>> more information for debugging. Such information could be hibern8 
>> events,
>> events sequences, recoverable errors, error history, and more.
> []
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> []
>> @@ -346,6 +346,37 @@ static inline void 
>> ufshcd_cond_add_cmd_trace(struct ufs_hba *hba,
> []
>> +static void ufshcd_print_uic_err_hist(struct ufs_hba *hba,
>> +		struct ufs_uic_err_reg_hist *err_hist, char *err_name)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < UIC_ERR_REG_HIST_LENGTH; i++) {
>> +		int p = (i + err_hist->pos - 1) % UIC_ERR_REG_HIST_LENGTH;
>> +
>> +		if (err_hist->reg[p] == 0)
>> +			continue;
>> +		dev_err(hba->dev, "%s[%d] = 0x%x at %lld us", err_name, i,
>> +			err_hist->reg[p], ktime_to_us(err_hist->tstamp[p]));
> 
> Please consistently use a terminating \n

Sure, will do that. Thanks.

> 
>> +	}
>> +}
>> +
>>  static void ufshcd_print_host_regs(struct ufs_hba *hba)
>>  {
>>  	/*
>> @@ -362,6 +393,21 @@ static void ufshcd_print_host_regs(struct ufs_hba 
>> *hba)
>>  	dev_err(hba->dev,
>>  		"hba->outstanding_reqs = 0x%x, hba->outstanding_tasks = 0x%x",
>>  		(u32)hba->outstanding_reqs, (u32)hba->outstanding_tasks);
>> +	dev_err(hba->dev,
>> +		"last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt = %d",
> 
> etc...
> 
> --
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