drm/i915/execlists: Reduce barrier on context switch to a wmb()

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Having been forced to reduce Braswell back to using the aliasing ppgtt,
the coherency issue we previously observed cannot impact us. Reduce the
performance penalty imposed on all platforms from using the mfence to a
mere sfence.

References: cf66b8a0ba ("drm/i915/execlists: Apply a full mb before execution for Braswell")
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: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191110185806.17413-10-chris@chris-wilson.co.uk

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Chris Wilson 2019-11-10 18:57:51 +00:00

parent 7a73e671ac

commit 69a48c1d28

1 changed files with 1 additions and 6 deletions

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drivers/gpu/drm/i915/gt/intel_lrc.c

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