drm/i915/gt: Serialize TLB invalidates with GT resets
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. Cc: stable@vger.kernel.org # v4.4 and upper Fixes: 7938d615 ("drm/i915: Flush TLBs before releasing backing store") Reported-by:Mauro Carvalho Chehab <mchehab@kernel.org> Tested-by:
Mauro Carvalho Chehab <mchehab@kernel.org> Reviewed-by:
Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by:
Chris Wilson <chris.p.wilson@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Reviewed-by:
Andi Shyti <andi.shyti@linux.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/1e59a7c45dd919a530256b9ac721ac6ea86c0677.1657639152.git.mchehab@kernel.org
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