drm/i915: disable platform support for vGPU huge gtt pages

Currently gvt gtt handling doesn't support huge page entries, so disable
for now.

v2: remove useless 48b PPGTT check

Suggested-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-20-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-19-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f8c3ac1..82a1003 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4822,6 +4822,15 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
 
        mutex_lock(&dev_priv->drm.struct_mutex);
 
+       /*
+        * We need to fallback to 4K pages since gvt gtt handling doesn't
+        * support huge page entries - we will need to check either hypervisor
+        * mm can support huge guest page or just do emulation in gvt.
+        */
+       if (intel_vgpu_active(dev_priv))
+               mkwrite_device_info(dev_priv)->page_sizes =
+                       I915_GTT_PAGE_SIZE_4K;
+
        dev_priv->mm.unordered_timeline = dma_fence_context_alloc(1);
 
        if (!i915_modparams.enable_execlists) {