[Intel-gfx] [PATCH v2 2/6] drm/i915: Enable full ppgtt for vgpu on Broadwell

[Joonas Lahtinen]

On pe, 2015-08-28 at 15:41 +0800, Zhiyuan Lv wrote:
> The full ppgtt is supported now in Intel GVT-g device model.
> Broadwell
> is allowed to use it in virtual machines.
> 
> v2:
> - Keep backward compatibility on HSW with old device model (daniel)
> 
> Signed-off-by: Zhiyuan Lv <zhiyuan.lv at intel.com>
> Signed-off-by: Zhi Wang <zhi.a.wang at intel.com>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

It's a good idea to add the version reviewed after Reviewed-by, when
adding a new revision. This is not to make it look like the new
revision had already been reviewed too.

I this case:

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com> (v1)

Would have been appropriate.

But you can now leave it as it is, as this patch seems fine, too. Maybe
could still add a comment in the code what makes Haswell special.

Regards, Joonas

> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
> b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index ed10e77..56cc8e8 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -108,8 +108,8 @@ 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 (intel_vgpu_active(dev))
> -		has_full_ppgtt = false; /* emulation is too hard */
> +	if (intel_vgpu_active(dev) && (IS_HASWELL(dev)))
> +		has_full_ppgtt = false;
>  
>  	/*
>  	 * We don't allow disabling PPGTT for gen9+ as it's a
> requirement for