linux-kernel - [PATCH] scsi: core: Log SCSI command age with errors

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Message-ID: <20190923060122.GA9603@machine1>
Date:   Mon, 23 Sep 2019 11:31:22 +0530
From:   "Milan P. Gandhi" <mgandhi@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Cc:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Subject: [PATCH] scsi: core: Log SCSI command age with errors

Couple of users had requested to print the SCSI command age along 
with command failure errors. This is a small change, but allows 
users to get more important information about the command that was 
failed, it would help the users in debugging the command failures:

Signed-off-by: Milan P. Gandhi <mgandhi@...hat.com>
---
diff --git a/drivers/scsi/scsi_logging.c b/drivers/scsi/scsi_logging.c
index ecc5918e372a..ca2182bc53c6 100644
--- a/drivers/scsi/scsi_logging.c
+++ b/drivers/scsi/scsi_logging.c
@@ -437,6 +437,7 @@ void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,
 	const char *mlret_string = scsi_mlreturn_string(disposition);
 	const char *hb_string = scsi_hostbyte_string(cmd->result);
 	const char *db_string = scsi_driverbyte_string(cmd->result);
+	unsigned long cmd_age = (jiffies - cmd->jiffies_at_alloc) / HZ;

 	logbuf = scsi_log_reserve_buffer(&logbuf_len);
 	if (!logbuf)
@@ -478,10 +479,15 @@ void scsi_print_result(const struct scsi_cmnd *cmd, const char *msg,

 	if (db_string)
 		off += scnprintf(logbuf + off, logbuf_len - off,
-				 "driverbyte=%s", db_string);
+				 "driverbyte=%s ", db_string);
 	else
 		off += scnprintf(logbuf + off, logbuf_len - off,
-				 "driverbyte=0x%02x", driver_byte(cmd->result));
+				 "driverbyte=0x%02x ",
+				 driver_byte(cmd->result));
+
+	off += scnprintf(logbuf + off, logbuf_len - off,
+			 "cmd-age=%lus", cmd_age);
+
 out_printk:
 	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);
 	scsi_log_release_buffer(logbuf);