Re: [PATCH 5/6] drm/i915/gt: Serialize GRDOM access between multiple engine resets

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On 23/06/2022 12:17, Andi Shyti wrote:
Hi Mauro,

On Wed, Jun 15, 2022 at 04:27:39PM +0100, Mauro Carvalho Chehab wrote:
From: Chris Wilson <chris.p.wilson@xxxxxxxxx>

Don't allow two engines to be reset in parallel, as they would both
try to select a reset bit (and send requests to common registers)
and wait on that register, at the same time. Serialize control of
the reset requests/acks using the uncore->lock, which will also ensure
that no other GT state changes at the same time as the actual reset.

Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store")

Reported-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>

Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>

Notice I had a bunch of questions and asks in this series so please do not merge until those are addressed.

In this particular patch (and some others) for instance Fixes: tag, at least against that sha, shouldn't be there.

Regards,

Tvrtko



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