linux-kernel - Re: [PATCH v2 2/2] scsi: sd: Rework asynchronous resume support

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Date:   Wed, 17 Aug 2022 11:53:30 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Bart Van Assche <bvanassche@....org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        scsi <linux-scsi@...r.kernel.org>,
        Ming Lei <ming.lei@...hat.com>, Hannes Reinecke <hare@...e.de>,
        John Garry <john.garry@...wei.com>, <ericspero@...oud.com>,
        <jason600.groome@...il.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <linux-ide@...r.kernel.org>,
        James Bottomley <James.Bottomley@...senpartnership.com>
Subject: Re: [PATCH v2 2/2] scsi: sd: Rework asynchronous resume support

Hello!

On 8/16/22 11:21 PM, Bart Van Assche wrote:

>> On Mon, Aug 15, 2022 at 3:49 PM Bart Van Assche <bvanassche@....org> wrote:
>>> Would it be possible to share the output of the command below? That
>>> should reveal which ATA driver is active on the test setup.
>>>
>>> find /sys -name proc_name | xargs grep -aH .
>>
>> /sys/devices/platform/soc/ee300000.sata/ata1/host0/scsi_host/host0/proc_name:sata_rcar
> 
> Thanks Geert for the help. Although I already posted a revert, I'm still trying to
> root-cause this issue. Do you perhaps know whether sata_rcar controllers support NCQ

   They don't. :-)

> and if so, what queue depth these controllers support? I think that information is available in sysfs. Here is an example for a VM:
> 
> # (cd /sys/class/scsi_device && for a in */device/*/*/ncq_prio_enable; do p=${a%/ncq_prio_enable}; grep -qi ata $p/inquiry || continue; grep -aH . $p/{queue_depth,ncq*}; done)
> 2:0:0:0/device/driver/2:0:0:0/queue_depth:32
> 2:0:0:0/device/driver/2:0:0:0/ncq_prio_enable:0
> 2:0:0:0/device/driver/2:0:0:0/ncq_prio_supported:0
> 2:0:0:0/device/generic/device/queue_depth:32
> 2:0:0:0/device/generic/device/ncq_prio_enable:0
> 2:0:0:0/device/generic/device/ncq_prio_supported:0
> 6:0:0:1/device/driver/2:0:0:0/queue_depth:32
> 6:0:0:1/device/driver/2:0:0:0/ncq_prio_enable:0
> 6:0:0:1/device/driver/2:0:0:0/ncq_prio_supported:0
> 
> Thanks,
> 
> Bart.

MBR, Sergey