[Intel-gfx] [PATCH v2 4/4] drm/i915: enable guest full ppgtt when device model supports

[Tina Zhang]

Add full ppgtt capability check in guest i915 driver and enable the full
ppgtt in guest only when device mode supports.

Changes since v1:
- Use u32 instead of uint32_t. (Joonas)
- Rewrite the vgpu full ppgtt capability checking logic. (Joonas)
- Some coding style refine. (Joonas)

Signed-off-by: Tina Zhang <tina.zhang at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h     |  1 +
 drivers/gpu/drm/i915/i915_gem_gtt.c | 11 +++++------
 drivers/gpu/drm/i915/i915_vgpu.c    |  7 +++++++
 drivers/gpu/drm/i915/i915_vgpu.h    |  3 +++
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 357b6c6..2e34927 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1909,6 +1909,7 @@ struct i915_workarounds {
 
 struct i915_virtual_gpu {
 	bool active;
+	u32 caps;
 };
 
 /* used in computing the new watermarks state */
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 8bab4ae..3f110aa 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -139,13 +139,12 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
 
 	has_aliasing_ppgtt = dev_priv->info.has_aliasing_ppgtt;
 	has_full_ppgtt = dev_priv->info.has_full_ppgtt;
-	has_full_48bit_ppgtt = dev_priv->info.has_full_48bit_ppgtt;
 
-	if (intel_vgpu_active(dev_priv)) {
-		/* emulation is too hard */
-		has_full_ppgtt = false;
-		has_full_48bit_ppgtt = false;
-	}
+	if (intel_vgpu_active(dev_priv))
+		has_full_ppgtt = intel_vgpu_has_full_ppgtt(dev_priv);
+
+	has_full_48bit_ppgtt = has_full_ppgtt &&
+				dev_priv->info.has_full_48bit_ppgtt;
 
 	if (!has_aliasing_ppgtt)
 		return 0;
diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
index 4ab8a97..adc4eda 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -77,10 +77,17 @@ void i915_check_vgpu(struct drm_i915_private *dev_priv)
 		return;
 	}
 
+	dev_priv->vgpu.caps = __raw_i915_read32(dev_priv, vgtif_reg(vgt_caps));
+
 	dev_priv->vgpu.active = true;
 	DRM_INFO("Virtual GPU for Intel GVT-g detected.\n");
 }
 
+bool intel_vgpu_has_full_ppgtt(struct drm_i915_private *dev_priv)
+{
+	return dev_priv->vgpu.caps & VGT_CAPS_FULL_PPGTT;
+}
+
 struct _balloon_info_ {
 	/*
 	 * There are up to 2 regions per mappable/unmappable graphic
diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h
index 3c3b2d2..b4e04eb 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.h
+++ b/drivers/gpu/drm/i915/i915_vgpu.h
@@ -27,6 +27,9 @@
 #include "i915_pvinfo.h"
 
 void i915_check_vgpu(struct drm_i915_private *dev_priv);
+
+bool intel_vgpu_has_full_ppgtt(struct drm_i915_private *dev_priv);
+
 int intel_vgt_balloon(struct drm_i915_private *dev_priv);
 void intel_vgt_deballoon(struct drm_i915_private *dev_priv);
 
-- 
2.7.4