[Beignet] [PATCH] SKL: Use kernel-defined MOCS values instead of assuming hardware defaults.

[Yang, Rong R]

LGTM, pushed, thanks.

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> Francisco Jerez
> Sent: Friday, December 4, 2015 21:34
> To: beignet at lists.freedesktop.org
> Subject: [Beignet] [PATCH] SKL: Use kernel-defined MOCS values instead of
> assuming hardware defaults.
> 
> Reported to fix fix a ~50% performance regression (in OpenCV 3.0 and
> Luxmark 2.1 among others) with v4.3 kernels on Gen9 hardware.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92975
> Signed-off-by: Francisco Jerez <currojerez at riseup.net>
> ---
>  src/intel/intel_gpgpu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/src/intel/intel_gpgpu.c b/src/intel/intel_gpgpu.c index
> 7f212e2..53a6dfc 100644
> --- a/src/intel/intel_gpgpu.c
> +++ b/src/intel/intel_gpgpu.c
> @@ -285,9 +285,9 @@ intel_gpgpu_get_cache_ctrl_gen8()  static uint32_t
>  intel_gpgpu_get_cache_ctrl_gen9()
>  {
> -  //Pre-defined cache control registers 9:
> +  //Kernel-defined cache control registers 2:
>    //L3CC: WB; LeCC: WB; TC: LLC/eLLC;
> -  return (0x9 << 1);
> +  return (0x2 << 1);
>  }
> 
>  static void
> --
> 2.5.1
> 
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