drm/i915/selftests: Provide full mb() around clflush

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clflush is an unserialised instruction and the IA manual strongly advises
you to serialise it with a mb. To be cautious, apply one before and one
after, so that it is serialised with both writes and reads without
worrying too much about the required direction.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180706174926.4712-1-chris@chris-wilson.co.uk

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Chris Wilson 2018-07-06 18:49:26 +01:00

parent 8b293eb53a

commit 3a32497f0d

1 changed files with 18 additions and 3 deletions

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drivers/gpu/drm/i915/selftests/i915_gem_coherency.c

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