linux-kernel - [PATCH] scsi: smartpqi_init: Reporting 'logical unit failure'

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Message-Id: <20190227163133.26283-1-e.velu@criteo.com>
Date:   Wed, 27 Feb 2019 17:31:33 +0100
From:   Erwan Velu <erwanaliasr1@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Erwan Velu <e.velu@...teo.com>,
        Don Brace <don.brace@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        esc.storagedev@...rosemi.com (open list:MICROSEMI SMART ARRAY SMARTPQI
        DRIVER (smartpqi)),
        linux-scsi@...r.kernel.org (open list:MICROSEMI SMART ARRAY SMARTPQI
        DRIVER (smartpqi)), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] scsi: smartpqi_init: Reporting 'logical unit failure'

When this HARDWARE_ERROR/0x3e/0x1 case is triggered, the logical volume is offlined.
When reading the kernel log, the cause why the device got offlined isn't reported to the user.
This situation makes difficult for admins to estimate _why_ the volume got offlined.
Reading this part of the code makes clear this is because driver received a HARDWARE_ERROR/0x3e/0x1 which is a 'logical unit failure'.

This patch is just about reporting that fact to help admins making a relationship between this event and the offlining.

Signed-off-by: Erwan Velu <e.velu@...teo.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index f564af8949e8..89f37d76735c 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -2764,6 +2764,12 @@ static void pqi_process_raid_io_error(struct pqi_io_request *io_request)
 				sshdr.sense_key == HARDWARE_ERROR &&
 				sshdr.asc == 0x3e &&
 				sshdr.ascq == 0x1) {
+			struct pqi_ctrl_info *ctrl_info = shost_to_hba(scmd->device->host);
+			struct pqi_scsi_dev *device = scmd->device->hostdata;
+
+			dev_err(&ctrl_info->pci_dev->dev, "received 'logical unit failure' from controller for scsi %d:%d:%d:%d\n",
+							ctrl_info->scsi_host->host_no, device->bus,
+							device->target, device->lun);
 			pqi_take_device_offline(scmd->device, "RAID");
 			host_byte = DID_NO_CONNECT;
 		}
-- 
2.20.1