[Intel-gfx] [PATCH] drm/i915: Use true PPGTT in Gen8 if execlists are enabled

[Daniel Vetter]

On Thu, Dec 11, 2014 at 12:07:18PM +0000, Michel Thierry wrote:
> When execlists submission is enabled, try full ppgtt by default.
> 
> Note, this patch considers that execlist support has been enabled by
> default on Gen8.
> 
> Signed-off-by: Michel Thierry <michel.thierry at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 171f6ea..4ed3904 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -40,8 +40,8 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>  
>  	has_aliasing_ppgtt = INTEL_INFO(dev)->gen >= 6;
>  	has_full_ppgtt = INTEL_INFO(dev)->gen >= 7;
> -	if (IS_GEN8(dev))
> -		has_full_ppgtt = false; /* XXX why? */
> +	if (IS_GEN8(dev) && !i915.enable_execlists)
> +		has_full_ppgtt = false; /* Only enforce with execlists */

Imo this has outlived it's usefulness - enable_ppgtt is an unsafe
parameter so everyone setting it themselves gets what they need.
Afair this was just because of the execlist depency on gen8 for ppgtt.
-Daniel

>  
>  	/*
>  	 * We don't allow disabling PPGTT for gen9+ as it's a requirement for
> @@ -72,7 +72,10 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>  		return 0;
>  	}
>  
> -	return has_aliasing_ppgtt ? 1 : 0;
> +	if (INTEL_INFO(dev)->gen < 8)
> +		return has_aliasing_ppgtt ? 1 : 0;
> +	else
> +		return has_full_ppgtt ? 2 : has_aliasing_ppgtt ? 1 : 0;
>  }
>  
>  
> -- 
> 2.1.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch