[Intel-gfx] [PATCH 10/25] drm/i915/execlists: Reduce barrier on context switch to a wmb()

[Joonas Lahtinen]

Quoting Chris Wilson (2019-11-10 20:57:51)
> 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: cf66b8a0ba14 ("drm/i915/execlists: Apply a full mb before execution for Braswell")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas