[Intel-gfx] [PATCH 4/8] drm/i915: Disable framebuffer compression for i915 driver in VM

[Jike Song]

From: Yu Zhang <yu.c.zhang at intel.com>

Framebuffer compression is disabled when driver detects it's
running in XenGT VM, because XenGT does not provide emulations
for FBC related operations, and we do not expose stolen memory
to the VM.

Signed-off-by: Yu Zhang <yu.c.zhang at intel.com>
Signed-off-by: Jike Song <jike.song at intel.com>
Signed-off-by: Zhiyuan Lv <zhiyuan.lv at intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 927acea..bb4ad52 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1741,6 +1741,10 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
 	i915_check_vgpu(dev);
 
+	/* disable framebuffer compression in vgt */
+	if (intel_vgpu_active(dev))
+		i915.enable_fbc = 0;
+
 	intel_irq_init(dev);
 	intel_uncore_sanitize(dev);
 
-- 
1.9.1