drm/i915: Enable guest i915 full ppgtt functionality

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.

Notice that the minor version of pvinfo isn't bumped because of this
vgt_caps introduction, due to older guest would be broken by simply
increasing the pvinfo version. Although the pvinfo minor version doesn't
increase, the compatibility won't be blocked. The compatibility is ensured
by checking the value of caps field in pvinfo. Zero means no full ppgtt
support and BIT(2) means this feature is provided.

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)

Change since v3:
- Add some comments about pvinfo caps and version. (Joonas)

Change since v4:
- Tested by Tina Zhang.

Change since v5:
- Add limitation about supporting 32bit full ppgtt.

Change since v6:
- Change the fallback to 48bit full ppgtt if i915.ppgtt_enable=2. (Zhenyu)

Change in v9:
- Remove the fixme comment due to no plan for 32bit full ppgtt
  support. (Zhenyu)
- Reorder the patch-set to fix compiling issue with git-bisect. (Zhenyu)
- Add print log when forcing guest 48bit full ppgtt. (Zhenyu)

v10:
- Update against Joonas's has_full_ppgtt and has_full_48bit_ppgtt disconnect
  change. (Zhenyu)

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> # in v2
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d63645a521c40dd36d13aeb85d1dff2c3071b73e..c38f46fd1fba4b1bd4895a28b97a916b481b09f0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1902,6 +1902,7 @@ 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 a5eada1b93c52cdfae96b69e64dd9595628d273a..ef1881e256f4971acc4e9bbb1c4eb4851023c62a 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -144,9 +144,9 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
        has_full_48bit_ppgtt = dev_priv->info.has_full_48bit_ppgtt;
 
        if (intel_vgpu_active(dev_priv)) {
-               /* emulation is too hard */
+               /* GVT-g has no support for 32bit ppgtt */
                has_full_ppgtt = false;
-               has_full_48bit_ppgtt = false;
+               has_full_48bit_ppgtt = intel_vgpu_has_full_48bit_ppgtt(dev_priv);
        }
 
        if (!has_aliasing_ppgtt)

diff --git a/drivers/gpu/drm/i915/i915_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
index 2cfe96d3e5d13e0dd1f6cc689a9af78608007617..0679a58cdbaea16a5a152871808bf0c214fca20c 100644 (file)
--- a/drivers/gpu/drm/i915/i915_pvinfo.h
+++ b/drivers/gpu/drm/i915/i915_pvinfo.h
@@ -49,12 +49,18 @@ enum vgt_g2v_type {
        VGT_G2V_MAX,
 };
 
+/*
+ * VGT capabilities type
+ */
+#define VGT_CAPS_FULL_48BIT_PPGTT      BIT(2)
+
 struct vgt_if {
        u64 magic;              /* VGT_MAGIC */
        u16 version_major;
        u16 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 cf7a958e4d3c2970d113c13f617ec90d601a7a93..5fe9f3f3946728aa7985ab6f251f685bc97cfe6b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -75,10 +75,17 @@ 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_48bit_ppgtt(struct drm_i915_private *dev_priv)
+{
+       return dev_priv->vgpu.caps & VGT_CAPS_FULL_48BIT_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 3c3b2d24e830447ff0023b47bf7a38d21f5048cc..b72bd2956b707d45837c2122fb49373443817999 100644 (file)
--- 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_48bit_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);