From: Thomas Daniel Date: Wed, 20 Aug 2014 15:24:50 +0000 (+0100) Subject: drm/i915/bdw: Do not initialize PPGTT in the legacy way for execlists X-Git-Tag: firefly_0821_release~176^2~3035^2~32^2~85 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=671b50134ccd75a5dd1584e306a9316587371af3;p=firefly-linux-kernel-4.4.55.git drm/i915/bdw: Do not initialize PPGTT in the legacy way for execlists A pending commit removes synchronous mode from switch_mm. This breaks execlists because switch_mm will always try to write to the legacy ring buffer. Return immediately from i915_ppgtt_init_gw in execlists mode. No longer check for execlists mode in gen8_ppgtt_enable() because this will no longer be called in execlists mode. Signed-off-by: Thomas Daniel Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 5b0b07988800..6f410cfb0510 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -777,12 +777,6 @@ static void gen8_ppgtt_enable(struct drm_device *dev) struct intel_engine_cs *ring; int j; - /* In the case of execlists, PPGTT is enabled by the context descriptor - * and the PDPs are contained within the context itself. We don't - * need to do anything here. */ - if (i915.enable_execlists) - return; - for_each_ring(ring, dev_priv, j) { I915_WRITE(RING_MODE_GEN7(ring), _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE)); @@ -1126,6 +1120,12 @@ int i915_ppgtt_init_hw(struct drm_device *dev) struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt; int i, ret = 0; + /* In the case of execlists, PPGTT is enabled by the context descriptor + * and the PDPs are contained within the context itself. We don't + * need to do anything here. */ + if (i915.enable_execlists) + return 0; + if (!USES_PPGTT(dev)) return 0;