[Intel-gfx] [PATCH v8 18/19] drm/i915/gen8: Flip the 48b switch

[Goel, Akash]

Reviewed the patch & it looks fine.
Reviewed-by: "Akash Goel <akash.goel at intel.com>"


On 7/31/2015 6:05 PM, Michel Thierry wrote:
> Use 48b addresses if hw supports it (i915.enable_ppgtt=3).
> Update the sanitize_enable_ppgtt for 48 bit PPGTT mode.
>
> Note, aliasing PPGTT remains 32b only.
>
> v2: s/full_64b/full_48b/. (Akash)
> v3: Add sanitize_enable_ppgtt changes until here. (Akash)
> v4: Update param description (Chris)
>
> Cc: Akash Goel <akash.goel at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Michel Thierry <michel.thierry at intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gem_gtt.c | 7 ++++++-
>   drivers/gpu/drm/i915/i915_params.c  | 2 +-
>   2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 7a526f9..31d20c6 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -104,9 +104,11 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>   {
>   	bool has_aliasing_ppgtt;
>   	bool has_full_ppgtt;
> +	bool has_full_48bit_ppgtt;
>
>   	has_aliasing_ppgtt = INTEL_INFO(dev)->gen >= 6;
>   	has_full_ppgtt = INTEL_INFO(dev)->gen >= 7;
> +	has_full_48bit_ppgtt = IS_BROADWELL(dev) || INTEL_INFO(dev)->gen >= 9;
>
>   	if (intel_vgpu_active(dev))
>   		has_full_ppgtt = false; /* emulation is too hard */
> @@ -125,6 +127,9 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>   	if (enable_ppgtt == 2 && has_full_ppgtt)
>   		return 2;
>
> +	if (enable_ppgtt == 3 && has_full_48bit_ppgtt)
> +		return 3;
> +
>   #ifdef CONFIG_INTEL_IOMMU
>   	/* Disable ppgtt on SNB if VT-d is on. */
>   	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
> @@ -141,7 +146,7 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>   	}
>
>   	if (INTEL_INFO(dev)->gen >= 8 && i915.enable_execlists)
> -		return 2;
> +		return has_full_48bit_ppgtt ? 3 : 2;
>   	else
>   		return has_aliasing_ppgtt ? 1 : 0;
>   }
> diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
> index 5ae4b0a..900e48a 100644
> --- a/drivers/gpu/drm/i915/i915_params.c
> +++ b/drivers/gpu/drm/i915/i915_params.c
> @@ -111,7 +111,7 @@ MODULE_PARM_DESC(enable_hangcheck,
>   module_param_named_unsafe(enable_ppgtt, i915.enable_ppgtt, int, 0400);
>   MODULE_PARM_DESC(enable_ppgtt,
>   	"Override PPGTT usage. "
> -	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full)");
> +	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)");
>
>   module_param_named(enable_execlists, i915.enable_execlists, int, 0400);
>   MODULE_PARM_DESC(enable_execlists,
>