[Intel-gfx] [PATCH 3/7] drm/i915: Always enable execlists on BDW for vgpu

[Zhiyuan Lv]

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 <zhiyuan.lv at intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 2dc8709..39df304 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -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;
 
-- 
1.9.1