[Intel-gfx] [PATCH 1/2] drm/i915/gtt: Enable full-ppgtt by default everywhere

[Chris Wilson]

We should we have all the kinks worked out and full-ppgtt now works
reliably on gen7 (Ivybridge, Valleyview/Baytrail and Haswell). If we can
let userspace have full control over their own ppgtt, it makes softpinning
far more effective, in turn making GPU dispatch far more efficient by
virtue of better mm segregation.  On the other hand, switching over to a
different GTT for every client does incur noticeable overhead, but only
for very lightweight tasks.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Cc: Matthew Auld <matthew.william.auld at gmail.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Jason Ekstrand <jason.ekstrand at intel.com>
Cc: Kenneth Graunke <kenneth at whitecape.org>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index f00c7fbef79e..9bad73332ce7 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -179,13 +179,11 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
 		return 0;
 	}
 
-	if (HAS_LOGICAL_RING_CONTEXTS(dev_priv)) {
-		if (has_full_48bit_ppgtt)
-			return 3;
+	if (has_full_48bit_ppgtt)
+		return 3;
 
-		if (has_full_ppgtt)
-			return 2;
-	}
+	if (has_full_ppgtt)
+		return 2;
 
 	return 1;
 }
-- 
2.18.0