drm/i915/gt: Serialize GRDOM access between multiple engine resets
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. Cc: stable@vger.kernel.org # v4.4 and upper Reported-by:Mika Kuoppala <mika.kuoppala@linux.intel.com> Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Acked-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by:
Andi Shyti <andi.shyti@intel.com> Reviewed-by:
Andrzej Hajda <andrzej.hajda@intel.com> Acked-by:
Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by:
Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by:
Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/e0a2d894e77aed7c2e36b0d1abdc7dbac3011729.1657639152.git.mchehab@kernel.org
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