drm/i915/selftests: Measure dispatch latency
A useful metric of the system's health is how fast we can tell the GPU to do various actions, so measure our latency. v2: Refactor all the instruction building into emitters. v3: Mark the error handling if not perfect, at least consistent. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by:
Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200519130802.4067-1-chris@chris-wilson.co.uk
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