[Intel-gfx] [v1 05/10] drm/i915: ppgtt update pvmmio optimization

[Xiaolin Zhang]

This patch extends g2v notification to notify host GVT-g of
ppgtt update from guest, including alloc_4lvl, clear_4lv4 and
insert_4lvl. It uses shared page to pass the additional params.
This patch also add one new pvmmio level to control ppgtt update.

Use PVMMIO_PPGTT_UPDATE to control this level of pvmmio optimization.

v1: rebase
v0: RFC

Signed-off-by: Xiaolin Zhang <xiaolin.zhang at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 36 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_pvinfo.h  |  3 +++
 drivers/gpu/drm/i915/i915_vgpu.c    |  3 ++-
 3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 29ca900..3e7cb35 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -941,6 +941,8 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
 	struct i915_pml4 *pml4 = &ppgtt->pml4;
 	struct i915_page_directory_pointer *pdp;
 	unsigned int pml4e;
+	u64 orig_start = start;
+	u64 orig_length = length;
 
 	GEM_BUG_ON(!use_4lvl(vm));
 
@@ -954,6 +956,16 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
 
 		free_pdp(vm, pdp);
 	}
+
+	if (PVMMIO_LEVEL_ENABLE(vm->i915, PVMMIO_PPGTT_UPDATE)) {
+		struct drm_i915_private *dev_priv = vm->i915;
+		struct pv_ppgtt_update *pv_ppgtt =
+				&dev_priv->vgpu.shared_page->pv_ppgtt;
+		pv_ppgtt->pdp = px_dma(pml4);
+		pv_ppgtt->start = orig_start;
+		pv_ppgtt->length = orig_length;
+		I915_WRITE(vgtif_reg(g2v_notify), VGT_G2V_PPGTT_L4_CLEAR);
+	}
 }
 
 static inline struct sgt_dma {
@@ -1195,6 +1207,18 @@ static void gen8_ppgtt_insert_4lvl(struct i915_address_space *vm,
 
 		vma->page_sizes.gtt = I915_GTT_PAGE_SIZE;
 	}
+
+	if (PVMMIO_LEVEL_ENABLE(vm->i915, PVMMIO_PPGTT_UPDATE)) {
+		struct drm_i915_private *dev_priv = vm->i915;
+		struct pv_ppgtt_update *pv_ppgtt =
+				&dev_priv->vgpu.shared_page->pv_ppgtt;
+		pv_ppgtt->pdp = px_dma(&ppgtt->pml4);
+		pv_ppgtt->start = vma->node.start;
+		pv_ppgtt->length = vma->node.size;
+		pv_ppgtt->cache_level = cache_level;
+		I915_WRITE(vgtif_reg(g2v_notify), VGT_G2V_PPGTT_L4_INSERT);
+	}
+
 }
 
 static void gen8_free_page_tables(struct i915_address_space *vm,
@@ -1438,6 +1462,8 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
 	u64 from = start;
 	u32 pml4e;
 	int ret;
+	u64 orig_start = start;
+	u64 orig_length = length;
 
 	gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
 		if (pml4->pdps[pml4e] == vm->scratch_pdp) {
@@ -1454,6 +1480,16 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
 			goto unwind_pdp;
 	}
 
+	if (PVMMIO_LEVEL_ENABLE(vm->i915, PVMMIO_PPGTT_UPDATE)) {
+		struct drm_i915_private *dev_priv = vm->i915;
+		struct pv_ppgtt_update *pv_ppgtt =
+				&dev_priv->vgpu.shared_page->pv_ppgtt;
+		pv_ppgtt->pdp = px_dma(pml4);
+		pv_ppgtt->start = orig_start;
+		pv_ppgtt->length = orig_length;
+		I915_WRITE(vgtif_reg(g2v_notify), VGT_G2V_PPGTT_L4_ALLOC);
+	}
+
 	return 0;
 
 unwind_pdp:
diff --git a/drivers/gpu/drm/i915/i915_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
index 1e24c45..790db50 100644
--- a/drivers/gpu/drm/i915/i915_pvinfo.h
+++ b/drivers/gpu/drm/i915/i915_pvinfo.h
@@ -46,6 +46,9 @@ enum vgt_g2v_type {
 	VGT_G2V_PPGTT_L4_PAGE_TABLE_DESTROY,
 	VGT_G2V_EXECLIST_CONTEXT_CREATE,
 	VGT_G2V_EXECLIST_CONTEXT_DESTROY,
+	VGT_G2V_PPGTT_L4_ALLOC,
+	VGT_G2V_PPGTT_L4_CLEAR,
+	VGT_G2V_PPGTT_L4_INSERT,
 	VGT_G2V_MAX,
 };
 
diff --git a/drivers/gpu/drm/i915/i915_vgpu.c b/drivers/gpu/drm/i915/i915_vgpu.c
index 6471574..ee81b62 100644
--- a/drivers/gpu/drm/i915/i915_vgpu.c
+++ b/drivers/gpu/drm/i915/i915_vgpu.c
@@ -66,7 +66,8 @@ void i915_check_vgpu(struct drm_i915_private *dev_priv)
 
 	BUILD_BUG_ON(sizeof(struct vgt_if) != VGT_PVINFO_SIZE);
 
-	dev_priv->vgpu.pv_caps = PVMMIO_ELSP_SUBMIT | PVMMIO_MASTER_IRQ;
+	dev_priv->vgpu.pv_caps = PVMMIO_ELSP_SUBMIT
+			| PVMMIO_MASTER_IRQ | PVMMIO_PPGTT_UPDATE;
 
 	magic = __raw_i915_read64(dev_priv, vgtif_reg(magic));
 	if (magic != VGT_MAGIC)
-- 
2.7.4