linux-kernel - Re: [PATCH v7 7/8] scsi: ufs: Move dumps in IRQ handler to error handler

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Message-ID: <7e5e942d-449b-bd52-32da-7f5beed116b7@codeaurora.org>
Date:   Tue, 28 Jul 2020 11:06:42 -0700
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Can Guo <cang@...eaurora.org>, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, rnayak@...eaurora.org,
        sh425.lee@...sung.com, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 7/8] scsi: ufs: Move dumps in IRQ handler to error
 handler

On 7/27/2020 10:00 PM, Can Guo wrote:
> Sometime dumps in IRQ handler are heavy enough to cause system stability
> issues, move them to error handler.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>   drivers/scsi/ufs/ufshcd.c | 31 +++++++++++++++----------------
>   1 file changed, 15 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index c480823..b2bafa3 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -5682,6 +5682,21 @@ static void ufshcd_err_handler(struct work_struct *work)
>   				    UFSHCD_UIC_DL_TCx_REPLAY_ERROR))))
>   		needs_reset = true;
>   
> +	if (hba->saved_err & (INT_FATAL_ERRORS | UIC_ERROR |
> +			      UFSHCD_UIC_HIBERN8_MASK)) {
> +		bool pr_prdt = !!(hba->saved_err & SYSTEM_BUS_FATAL_ERROR);
> +
> +		dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n",
> +				__func__, hba->saved_err, hba->saved_uic_err);
> +		spin_unlock_irqrestore(hba->host->host_lock, flags);
> +		ufshcd_print_host_state(hba);
> +		ufshcd_print_pwr_info(hba);
> +		ufshcd_print_host_regs(hba);
> +		ufshcd_print_tmrs(hba, hba->outstanding_tasks);
> +		ufshcd_print_trs(hba, hba->outstanding_reqs, pr_prdt);
> +		spin_lock_irqsave(hba->host->host_lock, flags);
> +	}
> +
>   	/*
>   	 * if host reset is required then skip clearing the pending
>   	 * transfers forcefully because they will get cleared during
> @@ -5900,22 +5915,6 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba)
>   
>   		/* block commands from scsi mid-layer */
>   		ufshcd_scsi_block_requests(hba);
> -
> -		/* dump controller state before resetting */
> -		if (hba->saved_err & (INT_FATAL_ERRORS | UIC_ERROR)) {
> -			bool pr_prdt = !!(hba->saved_err &
> -					SYSTEM_BUS_FATAL_ERROR);
> -
> -			dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n",
> -					__func__, hba->saved_err,
> -					hba->saved_uic_err);
> -
> -			ufshcd_print_host_regs(hba);
> -			ufshcd_print_pwr_info(hba);
How about keep the above prints and move the tmrs and trs to eh?
Sometimes in system instability, the eh may not get a chance to run 
even. Still the above prints would provide some clues.
> -			ufshcd_print_tmrs(hba, hba->outstanding_tasks);
> -			ufshcd_print_trs(hba, hba->outstanding_reqs,
> -					pr_prdt);
> -		}
>   		ufshcd_schedule_eh_work(hba);
>   		retval |= IRQ_HANDLED;
>   	}
> 


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