[PATCH v10 4/9] drm/i915: vgpu ppgtt update pv optimization

[Xiaolin Zhang <xiaolin.zhang@intel.com>]

This patch extends vgpu ppgtt g2v notification to notify host
GVT-g of ppgtt update from guest including alloc_4lvl, clear_4lv4
and insert_4lvl.

These updates use the shared memory page to pass struct pv_ppgtt_update
from guest to GVT which is used for pv optimiation implemeation within
host GVT side.

This patch also add one new pv_caps level to control ppgtt update.

Use PV_PPGTT_UPDATE to control this level of pv optimization.

v0: RFC.
v1: rebased.
v2: added pv callbacks for vm.{allocate_va_range, insert_entries,
clear_range} within ppgtt.
v3: rebased, disable huge page ppgtt support when using PVMMIO ppgtt
update due to complex and performance impact.
v4: moved alloc/insert/clear_4lvl pv callbacks into i915_vgpu_pv.c and
added a single intel_vgpu_config_pv_caps() for vgpu pv callbacks setup.
v5: rebase.
v6: rebase.
v7: rebase.

Signed-off-by: Xiaolin Zhang <xiaolin.zhang@intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c     |  3 +-
 drivers/gpu/drm/i915/i915_gem_gtt.c | 10 +++--
 drivers/gpu/drm/i915/i915_gem_gtt.h |  8 ++++
 drivers/gpu/drm/i915/i915_vgpu.c    | 79 +++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_vgpu.h    | 25 ++++++++++++
 5 files changed, 120 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 2da9544..1ade8e0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1309,7 +1309,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
 	int ret;
 
 	/* We need to fallback to 4K pages if host doesn't support huge gtt. */
-	if (intel_vgpu_active(dev_priv) && !intel_vgpu_has_huge_gtt(dev_priv))
+	if ((intel_vgpu_active(dev_priv) && !intel_vgpu_has_huge_gtt(dev_priv))
+		|| intel_vgpu_enabled_pv_caps(dev_priv, PV_PPGTT_UPDATE))
 		mkwrite_device_info(dev_priv)->page_sizes =
 			I915_GTT_PAGE_SIZE_4K;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e62e9d1..00b187a 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1015,7 +1015,7 @@ static u64 __gen8_ppgtt_clear(struct i915_address_space * const vm,
 	return start;
 }
 
-static void gen8_ppgtt_clear(struct i915_address_space *vm,
+void gen8_ppgtt_clear(struct i915_address_space *vm,
 			     u64 start, u64 length)
 {
 	GEM_BUG_ON(!IS_ALIGNED(start, BIT_ULL(GEN8_PTE_SHIFT)));
@@ -1126,7 +1126,7 @@ static int __gen8_ppgtt_alloc(struct i915_address_space * const vm,
 	return ret;
 }
 
-static int gen8_ppgtt_alloc(struct i915_address_space *vm,
+int gen8_ppgtt_alloc(struct i915_address_space *vm,
 			    u64 start, u64 length)
 {
 	u64 from;
@@ -1326,7 +1326,7 @@ static void gen8_ppgtt_insert_huge(struct i915_vma *vma,
 	} while (iter->sg);
 }
 
-static void gen8_ppgtt_insert(struct i915_address_space *vm,
+void gen8_ppgtt_insert(struct i915_address_space *vm,
 			      struct i915_vma *vma,
 			      enum i915_cache_level cache_level,
 			      u32 flags)
@@ -1517,8 +1517,10 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
 	ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc;
 	ppgtt->vm.clear_range = gen8_ppgtt_clear;
 
-	if (intel_vgpu_active(i915))
+	if (intel_vgpu_active(i915)) {
+		intel_vgpu_config_pv_caps(i915, PV_PPGTT_UPDATE, ppgtt);
 		gen8_ppgtt_notify_vgt(ppgtt, true);
+	}
 
 	ppgtt->vm.cleanup = gen8_ppgtt_cleanup;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 8fd2234..f5536bf 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -588,6 +588,14 @@ static inline void i915_vm_put(struct i915_address_space *vm)
 void gen6_ppgtt_unpin(struct i915_ppgtt *base);
 void gen6_ppgtt_unpin_all(struct i915_ppgtt *base);
 
+void gen8_ppgtt_clear(struct i915_address_space *vm,
+		u64 start, u64 length);
+void gen8_ppgtt_insert(struct i915_address_space *vm,
+		struct i915_vma *vma,
+		enum i915_cache_level cache_level, u32 flags);
+int gen8_ppgtt_alloc(struct i915_address_space *vm,
+		u64 start, u64 length);
+
 void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv);
 void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
index 6e29a52..e458892 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -96,6 +96,9 @@ void i915_detect_vgpu(struct drm_i915_private *dev_priv)
 	dev_priv->vgpu.active = true;
 	mutex_init(&dev_priv->vgpu.lock);
 
+	/* guest driver PV capability */
+	dev_priv->vgpu.pv_caps = PV_PPGTT_UPDATE;
+
 	if (!intel_vgpu_check_pv_caps(dev_priv, shared_area)) {
 		DRM_INFO("Virtual GPU for Intel GVT-g detected.\n");
 		goto out;
@@ -322,6 +325,82 @@ int intel_vgt_balloon(struct i915_ggtt *ggtt)
  * i915 vgpu PV support for Linux
  */
 
+static int vgpu_ppgtt_pv_update(struct drm_i915_private *dev_priv,
+		u32 action, u64 pdp, u64 start, u64 length, u32 cache_level)
+{
+	u32 data[8];
+
+	data[0] = action;
+	data[1] = lower_32_bits(pdp);
+	data[2] = upper_32_bits(pdp);
+	data[3] = lower_32_bits(start);
+	data[4] = upper_32_bits(start);
+	data[5] = lower_32_bits(length);
+	data[6] = upper_32_bits(length);
+	data[7] = cache_level;
+
+	return intel_vgpu_pv_send(dev_priv, data, ARRAY_SIZE(data));
+}
+
+static void gen8_ppgtt_clear_4lvl_pv(struct i915_address_space *vm,
+		u64 start, u64 length)
+{
+	struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+	struct drm_i915_private *dev_priv = vm->i915;
+
+	gen8_ppgtt_clear(vm, start, length);
+	vgpu_ppgtt_pv_update(dev_priv, PV_ACTION_PPGTT_L4_CLEAR,
+		px_dma(ppgtt->pd), start, length, 0);
+}
+
+static void gen8_ppgtt_insert_4lvl_pv(struct i915_address_space *vm,
+		struct i915_vma *vma,
+		enum i915_cache_level cache_level, u32 flags)
+{
+	struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+	struct drm_i915_private *dev_priv = vm->i915;
+	u64 start = vma->node.start;
+	u64 length = vma->node.size;
+
+	gen8_ppgtt_insert(vm, vma, cache_level, flags);
+	vgpu_ppgtt_pv_update(dev_priv, PV_ACTION_PPGTT_L4_INSERT,
+		px_dma(ppgtt->pd), start, length, cache_level);
+}
+
+static int gen8_ppgtt_alloc_4lvl_pv(struct i915_address_space *vm,
+		u64 start, u64 length)
+{
+	struct i915_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+	struct drm_i915_private *dev_priv = vm->i915;
+	int ret;
+
+	ret = gen8_ppgtt_alloc(vm, start, length);
+	if (ret)
+		return ret;
+
+	return vgpu_ppgtt_pv_update(dev_priv, PV_ACTION_PPGTT_L4_ALLOC,
+		px_dma(ppgtt->pd), start, length, 0);
+}
+
+/*
+ * config guest driver PV ops for different PV features
+ */
+void intel_vgpu_config_pv_caps(struct drm_i915_private *dev_priv,
+		enum pv_caps cap, void *data)
+{
+	struct i915_ppgtt *ppgtt;
+
+	if (!intel_vgpu_enabled_pv_caps(dev_priv, cap))
+		return;
+
+	if (cap == PV_PPGTT_UPDATE) {
+		ppgtt = (struct i915_ppgtt *)data;
+		ppgtt->vm.allocate_va_range = gen8_ppgtt_alloc_4lvl_pv;
+		ppgtt->vm.insert_entries = gen8_ppgtt_insert_4lvl_pv;
+		ppgtt->vm.clear_range = gen8_ppgtt_clear_4lvl_pv;
+	}
+}
+
 /**
  * wait_for_desc_update - Wait for the command buffer descriptor update.
  * @desc:	buffer descriptor
diff --git a/drivers/gpu/drm/i915/i915_vgpu.h b/drivers/gpu/drm/i915/i915_vgpu.h
index c494beb..b0fee5b 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.h
+++ b/drivers/gpu/drm/i915/i915_vgpu.h
@@ -33,6 +33,21 @@
 #define PV_CMD_OFF		(PAGE_SIZE/2)
 
 /*
+ * define different capabilities of PV optimization
+ */
+enum pv_caps {
+	PV_PPGTT_UPDATE = 0x1,
+};
+
+/* PV actions */
+enum intel_vgpu_pv_action {
+	PV_ACTION_DEFAULT = 0x0,
+	PV_ACTION_PPGTT_L4_ALLOC,
+	PV_ACTION_PPGTT_L4_CLEAR,
+	PV_ACTION_PPGTT_L4_INSERT,
+};
+
+/*
  * A shared page(4KB) between gvt and VM, could be allocated by guest driver
  * or a fixed location in PCI bar 0 region
  */
@@ -120,6 +135,14 @@ struct i915_virtual_gpu_pv {
 	return dev_priv->vgpu.caps & VGT_CAPS_PV;
 }
 
+static inline bool
+intel_vgpu_enabled_pv_caps(struct drm_i915_private *dev_priv,
+		enum pv_caps cap)
+{
+	return (dev_priv->vgpu.active) && intel_vgpu_has_pv_caps(dev_priv)
+			&& (dev_priv->vgpu.pv_caps & cap);
+}
+
 static inline void
 intel_vgpu_pv_notify(struct drm_i915_private *dev_priv)
 {
@@ -139,4 +162,6 @@ struct i915_virtual_gpu_pv {
 /* i915 vgpu pv related functions */
 bool intel_vgpu_check_pv_caps(struct drm_i915_private *dev_priv,
 		void __iomem *shared_area);
+void intel_vgpu_config_pv_caps(struct drm_i915_private *dev_priv,
+		enum pv_caps cap, void *data);
 #endif /* _I915_VGPU_H_ */
-- 
1.8.3.1

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