[Intel-gfx] [PATCH 6/8] drm/i915: Disable power management for i915 driver in VM

[Jike Song]

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

In XenGT, GPU power management is controlled by host i915
driver, so there is no need to provide virtualized GPU PM
support. In the future it might be useful to gather VM
input for freq boost, but now let's disable it simply.

Signed-off-by: Yu Zhang <yu.c.zhang at intel.com>
Signed-off-by: Jike Song <jike.song at intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 675e8a2..1535fa3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5419,6 +5419,12 @@ void intel_enable_gt_powersave(struct drm_device *dev)
 		mutex_unlock(&dev->struct_mutex);
 	} else if (INTEL_INFO(dev)->gen >= 6) {
 		/*
+		 * Powersaving is disabled when running inside a VM.
+		 */
+		if (intel_vgpu_active(dev))
+			return;
+
+		/*
 		 * PCU communication is slow and this doesn't need to be
 		 * done at any specific time, so do this out of our fast path
 		 * to make resume and init faster.
-- 
1.9.1