scsi: ufs: handle non spec compliant bkops behaviour by device

We are seeing that some devices are raising the urgent bkops exception
events even when BKOPS status doesn't indicate performace impacted or
critical. Handle these device by determining their urgent bkops status
at runtime.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 46 insertions, 7 deletions

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b429a57984a2..82a4b1c3a837 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3763,7 +3763,7 @@ out:
  */
 static int ufshcd_urgent_bkops(struct ufs_hba *hba)
 {
-	return ufshcd_bkops_ctrl(hba, BKOPS_STATUS_PERF_IMPACT);
+	return ufshcd_bkops_ctrl(hba, hba->urgent_bkops_lvl);
 }
 
 static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
@@ -3772,6 +3772,43 @@ static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
 			QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
 }
 
+static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
+{
+	int err;
+	u32 curr_status = 0;
+
+	if (hba->is_urgent_bkops_lvl_checked)
+		goto enable_auto_bkops;
+
+	err = ufshcd_get_bkops_status(hba, &curr_status);
+	if (err) {
+		dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	/*
+	 * We are seeing that some devices are raising the urgent bkops
+	 * exception events even when BKOPS status doesn't indicate performace
+	 * impacted or critical. Handle these device by determining their urgent
+	 * bkops status at runtime.
+	 */
+	if (curr_status < BKOPS_STATUS_PERF_IMPACT) {
+		dev_err(hba->dev, "%s: device raised urgent BKOPS exception for bkops status %d\n",
+				__func__, curr_status);
+		/* update the current status as the urgent bkops level */
+		hba->urgent_bkops_lvl = curr_status;
+		hba->is_urgent_bkops_lvl_checked = true;
+	}
+
+enable_auto_bkops:
+	err = ufshcd_enable_auto_bkops(hba);
+out:
+	if (err < 0)
+		dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
+				__func__, err);
+}
+
 /**
  * ufshcd_exception_event_handler - handle exceptions raised by device
  * @work: pointer to work data
@@ -3795,12 +3832,10 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
 	}
 
 	status &= hba->ee_ctrl_mask;
-	if (status & MASK_EE_URGENT_BKOPS) {
-		err = ufshcd_urgent_bkops(hba);
-		if (err < 0)
-			dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
-					__func__, err);
-	}
+
+	if (status & MASK_EE_URGENT_BKOPS)
+		ufshcd_bkops_exception_event_handler(hba);
+
 out:
 	pm_runtime_put_sync(hba->dev);
 	return;
@@ -4832,6 +4867,10 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
 
 	ufshcd_init_pwr_info(hba);
 
+	/* set the default level for urgent bkops */
+	hba->urgent_bkops_lvl = BKOPS_STATUS_PERF_IMPACT;
+	hba->is_urgent_bkops_lvl_checked = false;
+
 	/* UniPro link is active now */
 	ufshcd_set_link_active(hba);