Re: [PATCH] drm/i915: Disconnect 32 and 48 bit ppGTT support

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Looks has_full_48bit_ppgtt is tied to has_full_ppgtt now. Will that be disconnected also in future?

On 08/11/17 17:51, Joonas Lahtinen wrote:
Configurations like virtualized environments may support only 48 bit
ppGTT without supporting 32 bit ppGTT. Support this by disconnecting
the relationship of the two feature bits.

Cc: Tina Zhang <tina.zhang@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Zhi Wang <zhi.a.wang@xxxxxxxxx>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_gem_gtt.c | 13 +++++++++----
  1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 10aa776..a5eada1 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -180,10 +180,15 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
  		return 0;
  	}
- if (INTEL_GEN(dev_priv) >= 8 && i915.enable_execlists && has_full_ppgtt)
-		return has_full_48bit_ppgtt ? 3 : 2;
-	else
-		return has_aliasing_ppgtt ? 1 : 0;
+	if (INTEL_GEN(dev_priv) >= 8 && i915.enable_execlists) {
+		if (has_full_48bit_ppgtt)
+			return 3;
+
+		if (has_full_ppgtt)
+			return 2;
+	}
+
+	return has_aliasing_ppgtt ? 1 : 0;
  }
static int ppgtt_bind_vma(struct i915_vma *vma,

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