drm/i915: Disable framebuffer compression for i915 driver in VM

Framebuffer compression is disabled when driver detects it's
running in a Intel GVT-g enlightened VM, because FBC is not
emulated and there is no stolen memory for a vGPU.

v2:
take Chris' comments:
        - move the code into intel_update_fbc()

v4:
take Tvrtko's comments:
        - rebase the code into intel_fbc_update()

Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Signed-off-by: Jike Song <jike.song@intel.com>
Signed-off-by: Zhiyuan Lv <zhiyuan.lv@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 7341e87221ae16f8882142c358d48571ab3cb38c..ee65731baaf7dfd837a49043982a41eb18211db5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -505,6 +505,10 @@ void intel_fbc_update(struct drm_device *dev)
        if (!HAS_FBC(dev))
                return;
 
+       /* disable framebuffer compression in vGPU */
+       if (intel_vgpu_active(dev))
+               i915.enable_fbc = 0;
+
        if (i915.enable_fbc < 0) {
                if (set_no_fbc_reason(dev_priv, FBC_CHIP_DEFAULT))
                        DRM_DEBUG_KMS("disabled per chip default\n");