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

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Date:   Thu, 28 Feb 2019 13:09:18 +0000
From:   Erwan Velu <e.velu@...teo.com>
To:     Erwan Velu <erwanaliasr1@...il.com>
CC:     Don Brace <don.brace@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "open list:MICROSEMI SMART ARRAY SMARTPQI DRIVER (smartpqi)" 
        <esc.storagedev@...rosemi.com>,
        "open list:MICROSEMI SMART ARRAY SMARTPQI DRIVER (smartpqi)" 
        <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: smartpqi_init: Reporting 'logical unit failure'

Hey,

That makes me wonder why the 0x3e / 0x2 isn't handled here aka

3E/02 DZTPROMAEBKVF TIMEOUT ON LOGICAL UNIT Is it possible the 
controller send to the kernel this kind of message, if so shouldn't we 
handle it here ? Erwan,

Le 27/02/2019 à 17:31, Erwan Velu a écrit :

> 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;
>   		}