linux-kernel - Re: [PATCH] Revert "blk-mq: issue directly if hw queue isn't busy in case of 'none'"

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Date:   Wed, 29 Aug 2018 08:15:44 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Hunter, Adrian" <adrian.hunter@...el.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     Ian W MORRISON <ianwmorrison@...il.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kashyap.desai@...adcom.com" <kashyap.desai@...adcom.com>,
        "loberman@...hat.com" <loberman@...hat.com>,
        "osandov@...com" <osandov@...com>, "hch@....de" <hch@....de>,
        "bart.vanassche@....com" <bart.vanassche@....com>,
        "hare@...e.de" <hare@...e.de>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>
Subject: Re: [PATCH] Revert "blk-mq: issue directly if hw queue isn't busy in
 case of 'none'"

On 28 August 2018 at 21:11, Hunter, Adrian <adrian.hunter@...el.com> wrote:
>> -----Original Message-----
>> From: Jens Axboe [mailto:axboe@...nel.dk]
>> Sent: Tuesday, August 28, 2018 8:12 PM
>> To: Ian W MORRISON <ianwmorrison@...il.com>
>> Cc: linux-block@...r.kernel.org; linux-kernel@...r.kernel.org;
>> kashyap.desai@...adcom.com; loberman@...hat.com; osandov@...com;
>> hch@....de; bart.vanassche@....com; hare@...e.de;
>> ming.lei@...hat.com; Hunter, Adrian <adrian.hunter@...el.com>
>> Subject: Re: [PATCH] Revert "blk-mq: issue directly if hw queue isn't busy in
>> case of 'none'"
>>
>> On 8/28/18 11:01 AM, Ian W MORRISON wrote:
>> > On Wed, 29 Aug 2018 at 02:13, Jens Axboe <axboe@...nel.dk> wrote:
>> >>
>> >> On 8/28/18 10:10 AM, Ian W MORRISON wrote:
>> >>> On Wed, 29 Aug 2018 at 02:09, Jens Axboe <axboe@...nel.dk> wrote:
>> >>>>
>> >>>> On 8/28/18 10:07 AM, Ian W MORRISON wrote:
>> >>>>> On Wed, 29 Aug 2018 at 01:48, Jens Axboe <axboe@...nel.dk>
>> wrote:
>> >>>>>>
>> >>>>>> On 8/28/18 9:47 AM, Ian W MORRISON wrote:
>> >>>>>>> Kernel oops when booting on Bay and Cherry Trail devices such as
>> >>>>>>> Intel Compute Stick. Bisected as:
>> >>>>>>>
>> >>>>>>> commit 6ce3dd6eec11 ("blk-mq: issue directly if hw queue isn't
>> >>>>>>> busy in case of 'none'")
>> >>>>>>>
>> >>>>>>> This patch reverts the above commit.
>> >>>>>>
>> >>>>>> Did I miss the posting of that oops? Just curious where this is
>> >>>>>> going wrong. Not adverse to reverting, but I'd like to try to
>> >>>>>> understand the issue first.
>> >>>>>>
>> >>>>>> --
>> >>>>>> Jens Axboe
>> >>>>>>
>> >>>>>
>> >>>>> I've not been able to capture it however manually transcribing
>> >>>>> what is on the screen:
>> >>>>>
>> >>>>> mmc0: Got data interrupt 0x00000002 even though no data operation
>> >>>>>
>> >>>>> followed by:
>> >>>>>
>> >>>>> mmc0: sdhci: ============= SDHCI REGISTER DUMP
>> ==============
>> >>>>>
>> >>>>> Do you want any specific register value or should I transcribe
>> >>>>> each (as I am working from an image taken at boot)?
>> >>>>
>> >>>> Just take a picture of the screen, that should be good enough.
>> >>>>
>> >>>> --
>> >>>> Jens Axboe
>> >>>>
>> >>>
>> >>> Attached as requested.
>> >>
>> >> Can you see if this patch helps?
>> >>
>> >> https://marc.info/?l=linux-mmc&m=153485326025301&w=2
>> >>
>> >> --
>> >> Jens Axboe
>> >>
>> >
>> > I confirm that the above patch works with commit 6ce3dd6eec11 and
>> > removes the need for reverting it on eMMC based devices.
>> >
>> > Tested on Bay Trail, Cherry Trail (both now working) and Kaby Lake
>> > (not affected) devices.
>>
>> Great, thanks for testing. Adrian, when is this going upstream?
>
> It is in Ulf's fixes branch, so most likely v4.19-rc2 .  Then to stable in due course.
>
>         https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git/commit/?h=fixes&id=26caddf274cf1e89fd4ce44ab2b8dbc7a7f97681

Yep, correct!

As I told someone before, I am deliberately holding on to fixes a
little longer that before, to extend the test coverage a bit.

If someone wants to test the latest rc with fixes, one could instead
try the pending-fixes branch in Stephen Rothwell's linux-next tree.

Kind regards
Uffe