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drm/i915: Always enable execlists on BDW for vgpu 

Broadwell hardware supports both ring buffer mode and execlist mode.
When i915 runs inside a VM with Intel GVT-g, we allow execlist mode
only.

The main reason of EXECLIST only is that GVT-g does not support the
dynamic mode switch between ring buffer mode and execlist mode when
running multiple virtual machines.

v2:
- Adjust the position of vgpu check in sanitize function (Joonas)
- Add vgpu error check in context initialization. (Joonas, Daniel)

Signed-off-by: Zhiyuan Lv <zhiyuan.lv@intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Zhiyuan Lv 2015-08-28 15:41:16 +08:00 committed by Daniel Vetter
parent 331f38e77d
commit a0bd6c3183
2 changed files with 13 additions and 0 deletions
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7
drivers/gpu/drm/i915/i915_gem_context.c
View File

@ -332,6 +332,13 @@ int i915_gem_context_init(struct drm_device *dev)
if (WARN_ON(dev_priv->ring[RCS].default_context))
return 0;
if (intel_vgpu_active(dev) && HAS_LOGICAL_RING_CONTEXTS(dev)) {
if (!i915.enable_execlists) {
DRM_INFO("Only EXECLIST mode is supported in vgpu.\n");
return -EINVAL;
}
}
if (i915.enable_execlists) {
/* NB: intentionally left blank. We will allocate our own
* backing objects as we need them, thank you very much */

6
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -236,6 +236,12 @@ int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists
{
WARN_ON(i915.enable_ppgtt == -1);
/* On platforms with execlist available, vGPU will only
* support execlist mode, no ring buffer mode.
*/
if (HAS_LOGICAL_RING_CONTEXTS(dev) && intel_vgpu_active(dev))
return 1;
if (INTEL_INFO(dev)->gen >= 9)
return 1;