[PATCH 6/6] drm/i915/gt: Serialize TLB invalidates with GT resets

[Andi Shyti]

Hi Mauro,

On Wed, Jun 15, 2022 at 04:27:40PM +0100, Mauro Carvalho Chehab wrote:
> From: Chris Wilson <chris.p.wilson at intel.com>
> 
> Avoid trying to invalidate the TLB in the middle of performing an
> engine reset, as this may result in the reset timing out. Currently,
> the TLB invalidate is only serialised by its own mutex, forgoing the
> uncore lock, but we can take the uncore->lock as well to serialise
> the mmio access, thereby serialising with the GDRST.
> 
> Tested on a NUC5i7RYB, BIOS RYBDWi35.86A.0380.2019.0517.1530 with
> i915 selftest/hangcheck.
> 
> Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store")
> 
> Reported-by: Mauro Carvalho Chehab <mchehab at kernel.org>
> Tested-by: Mauro Carvalho Chehab <mchehab at kernel.org>
> Reviewed-by: Mauro Carvalho Chehab <mchehab at kernel.org>
> Signed-off-by: Chris Wilson <chris.p.wilson at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
> Cc: stable at vger.kernel.org
> Acked-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab at kernel.org>

Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>

Thanks,
Andi