drm/i915/selftests: Exercise resetting in the middle of a wait-on-fence
authorChris Wilson <chris@chris-wilson.co.uk>
Thu, 19 Jul 2018 19:47:46 +0000 (20:47 +0100)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 26 Jul 2018 12:32:08 +0000 (13:32 +0100)
commit6dc17d69f83ec315157b76fbf47d4379e1266cef
tree0abcee99ae1bf76d3544e4e25ced89b7486e3626
parentab84a110490d38d40780113a1cdfce03b1cdec13
drm/i915/selftests: Exercise resetting in the middle of a wait-on-fence

On older HW, gen2/3, fence registers are used for detiling GPU commands
and as such changing those registers requires serialisation with the
requests on the GPU. Anything running on the GPU is subject to a hang,
and so we must be able to recover cleanly in the middle of a stuck wait
on a fence register.

We can simulate using the fence on the GPU simply by marking the fence
as active on the request for this vma, the interface being common to all
gen, thus broadening the test.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180719194746.19111-2-chris@chris-wilson.co.uk
drivers/gpu/drm/i915/selftests/intel_hangcheck.c