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

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Date:   Mon, 12 Dec 2016 17:19:45 -0800
From:   Joe Perches <joe@...ches.com>
To:     Subhash Jadavani <subhashj@...eaurora.org>, vinholikatti@...il.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Dolev Raviv <draviv@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 12/12] scsi: ufs: Improve fatal error logs

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

> +	}
> +}
> +
>  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...