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

[Chris Wilson]

On Sat, Sep 20, 2014 at 02:47:04AM +0800, Jike Song wrote:
> 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;

This should be done inside intel_enable_fbc() so that the correct reason
is given as to why it is disabled.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre