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drm/i915: Always enable execlists on BDW for vgpu

PATCH In review Zhiyuan Lv 1 participant 1 message Aug 20, 2015

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DRM drivers Intel i915
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Zhiyuan Lv

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PATCH 3/7 drm/i915: Always enable execlists on BDW for vgpu

Broadwell hardware supports both ring buffer mode and execlist mode. When i915 runs inside a VM with Intel GVT-g, we allow execlist mode only. The reason is that GVT-g does not support the dynamic mode switch between ring buffer mode and execlist mode when running multiple virtual machines. Consider that ring buffer mode is legacy mode, it makes sense to drop it inside virtual machines.

Signed-off-by Zhiyuan Lv <[email protected]>
Signed-off-by Zhi Wang <[email protected]>
---
 drivers/gpu/drm/i915/intel_lrc.c | 3 +++
 1 file changed, 3 insertions(+)
drivers/gpu/drm/i915/intel_lrc.c +3 -0
index 2dc8709..39df304 100644
@@ -239,6 +239,9 @@ int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists
 	if (INTEL_INFO(dev)->gen >= 9)
 		return 1;
 
+	if (HAS_LOGICAL_RING_CONTEXTS(dev) && intel_vgpu_active(dev))
+		return 1;
+
 	if (enable_execlists == 0)
 		return 0;
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