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

[Chris Wilson]

On Sat, Sep 20, 2014 at 02:47:06AM +0800, Jike Song wrote:
> 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;

Don't special case this to gen6+, it always applies because the comment
is not accurate, whereas the changelog is a much more apt description.

/* Powersaving is controlled by the host when inside a VM */
if (intel_vgpu_active(dev))
	return;
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre