[Intel-gfx] [PATCH v3] drm/i915: Enable guest i915 full ppgtt functionality

[Tina Zhang]

Enable the guest i915 full ppgtt functionality when host can provide this
capability. vgt_caps is introduced to guest i915 driver to get the vgpu
capabilities from the device model. VGT_CPAS_FULL_PPGTT is one of the
capabilities type to let guest i915 dirver know that the guest i915 full
ppgtt is supported by device model.

Changes since v1:
- Use u32 instead of uint32_t (Joonas)
- Move VGT_CAPS_FULL_PPGTT introduction to this patch and use #define
  instead of enum (Joonas)
- Rewrite the vgpu full ppgtt capability checking logic. (Joonas)
- Some coding style refine. (Joonas)

Changes since v2:
- Divide the whole patch set into two separate patch series, with one
  patch in i915 side to check guest i915 full ppgtt capability and enable
  it when this capability is supported by the device model, and the other
  one in gvt side which fixs the blocking issue and enables the device
  model to provide the capability to guest. And this patch focuses on guest
  i915 side. (Joonas)
- Change the title from "introduce vgt_caps to pvinfo" to
  "Enable guest i915 full ppgtt functionality". (Tina)

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Tina Zhang <tina.zhang at intel.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 17883a8..a630e5e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1860,6 +1860,7 @@ 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 a9d78eb..10629d9 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -141,13 +141,12 @@ 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_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
index c0cb297..8dc0664 100644
--- a/drivers/gpu/drm/i915/i915_pvinfo.h
+++ b/drivers/gpu/drm/i915/i915_pvinfo.h
@@ -53,12 +53,18 @@ enum vgt_g2v_type {
 	VGT_G2V_MAX,
 };
 
+/*
+ * VGT capabilities type
+ */
+#define VGT_CAPS_FULL_PPGTT	BIT(2)
+
 struct vgt_if {
 	u64 magic;		/* VGT_MAGIC */
 	uint16_t version_major;
 	uint16_t version_minor;
 	u32 vgt_id;		/* ID of vGT instance */
-	u32 rsv1[12];		/* pad to offset 0x40 */
+	u32 vgt_caps;		/* VGT capabilities */
+	u32 rsv1[11];		/* pad to offset 0x40 */
 	/*
 	 *  Data structure to describe the balooning info of resources.
 	 *  Each VM can only have one portion of continuous area for now.
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