[PATCH 06/14] drm/amdgpu: implement amdgpu_vm_recover_page_table_from_shadow

[David1.Zhou@xxxxxxx (Chunming Zhou)]

Change-Id: I9957e726576289448911f5fb2ff7bcb9311a1906
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h    |  2 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 77 ++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index a7951aa..1f941c4a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1000,6 +1000,8 @@ int amdgpu_vm_bo_unmap(struct amdgpu_device *adev,
 		       uint64_t addr);
 void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
 		      struct amdgpu_bo_va *bo_va);
+int amdgpu_vm_recover_page_table_from_shadow(struct amdgpu_device *adev,
+					     struct amdgpu_vm *vm);
 
 /*
  * context related structures
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index fb8a7ab..4f95dc4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -700,6 +700,83 @@ error_free:
 	return r;
 }
 
+static int amdgpu_vm_recover_bo_from_shadow(struct amdgpu_device *adev,
+					    struct amdgpu_bo *bo,
+					    struct amdgpu_bo *bo_shadow,
+					    struct reservation_object *resv)
+
+{
+	struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
+	struct fence *fence;
+	int r;
+	uint64_t vram_addr, gtt_addr;
+
+	r = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_VRAM, &vram_addr);
+	if (r) {
+		DRM_ERROR("Failed to pin bo object\n");
+		goto err1;
+	}
+	r = amdgpu_bo_pin(bo_shadow, AMDGPU_GEM_DOMAIN_GTT, &gtt_addr);
+	if (r) {
+		DRM_ERROR("Failed to pin bo shadow object\n");
+		goto err2;
+	}
+
+	r = reservation_object_reserve_shared(bo->tbo.resv);
+	if (r)
+		goto err3;
+
+	r = amdgpu_copy_buffer(ring, gtt_addr, vram_addr,
+			       amdgpu_bo_size(bo), resv, &fence);
+	if (!r)
+		amdgpu_bo_fence(bo, fence, true);
+
+err3:
+	amdgpu_bo_unpin(bo_shadow);
+err2:
+	amdgpu_bo_unpin(bo);
+err1:
+
+	return r;
+}
+
+int amdgpu_vm_recover_page_table_from_shadow(struct amdgpu_device *adev,
+					     struct amdgpu_vm *vm)
+{
+	uint64_t pt_idx;
+	int r;
+
+	/* bo and shadow use same resv, so reverve one time */
+	r = amdgpu_bo_reserve(vm->page_directory, false);
+	if (unlikely(r != 0))
+		return r;
+
+	r = amdgpu_vm_recover_bo_from_shadow(adev, vm->page_directory,
+					     vm->page_directory->shadow,
+					     NULL);
+	if (r) {
+		DRM_ERROR("recover page table failed!\n");
+		goto err;
+	}
+
+	for (pt_idx = 0; pt_idx <= vm->max_pde_used; ++pt_idx) {
+		struct amdgpu_bo *bo = vm->page_tables[pt_idx].entry.robj;
+		struct amdgpu_bo *bo_shadow = vm->page_tables[pt_idx].entry_shadow.robj;
+
+		if (!bo || !bo_shadow)
+			continue;
+		r = amdgpu_vm_recover_bo_from_shadow(adev, bo, bo_shadow,
+						     NULL);
+		if (r) {
+			DRM_ERROR("recover page table failed!\n");
+			goto err;
+		}
+	}
+
+err:
+	amdgpu_bo_unreserve(vm->page_directory);
+	return r;
+}
 /**
  * amdgpu_vm_update_pdes - make sure that page directory is valid
  *
-- 
1.9.1