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

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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@xxxxxxxxxxxxxx>
---
  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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