Re: [PATCH 2/2] drm/i915/gen8: Flip the 48b switch

Daniel Vetter
2015-10-01T13:13:35Z

On Wed, Sep 30, 2015 at 03:36:19PM +0100, 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@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Michel Thierry <michel.thierry@intel.com>

Queued for -next, thanks for the patch. Can you please ping someone from
mesa to push the libdrm/mesa patches too?

Cheers, Daniel

> ---
> 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 47344d0..2d964a7 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 ca9b8f6..368df67 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_unsafe(enable_execlists, i915.enable_execlists, int, 0400);
> MODULE_PARM_DESC(enable_execlists,
> --
> 2.6.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation