[PATCH 06/18] drm/amdgpu: implement vm recovery function from shadow

[Chunming Zhou]

Change-Id: I46783043eecbe9fc9c2ce9230be1085aca3731bd
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h    |  4 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 48 ++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 38ed6c4..f6df77f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -922,6 +922,8 @@ struct amdgpu_vm {
 
 	/* client id */
 	u64                     client_id;
+
+	struct fence            *shadow_sync_fence;
 };
 
 struct amdgpu_vm_id {
@@ -1012,6 +1014,8 @@ 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 c1b37dc..3775e9b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -702,6 +702,52 @@ error_free:
 	return r;
 }
 
+int amdgpu_vm_recover_page_table_from_shadow(struct amdgpu_device *adev,
+					     struct amdgpu_vm *vm)
+{
+	struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
+	struct fence *fence;
+	uint64_t pt_idx;
+	int r;
+
+	if (!vm->page_directory->shadow)
+		return 0;
+
+	r = amdgpu_bo_reserve(vm->page_directory, false);
+	if (r)
+		return r;
+	vm->page_directory->backup_shadow = AMDGPU_BO_SHADOW_TO_PARENT;
+	r = amdgpu_bo_sync_between_bo_and_shadow(adev, ring,
+						 vm->page_directory,
+						 NULL, &fence);
+	if (r) {
+		DRM_ERROR("recover page table failed!\n");
+		goto err;
+	}
+	fence_put(vm->shadow_sync_fence);
+	vm->shadow_sync_fence = fence_get(fence);
+	fence_put(fence);
+	for (pt_idx = 0; pt_idx <= vm->max_pde_used; ++pt_idx) {
+		struct amdgpu_bo *bo = vm->page_tables[pt_idx].entry.robj;
+
+		if (!bo)
+			continue;
+		bo->backup_shadow = AMDGPU_BO_SHADOW_TO_PARENT;
+		r = amdgpu_bo_sync_between_bo_and_shadow(adev, ring, bo,
+							 NULL, &fence);
+		if (r) {
+			DRM_ERROR("recover page table failed!\n");
+			goto err;
+		}
+		fence_put(vm->shadow_sync_fence);
+		vm->shadow_sync_fence = fence_get(fence);
+		fence_put(fence);
+	}
+
+err:
+	amdgpu_bo_unreserve(vm->page_directory);
+	return r;
+}
 /**
  * amdgpu_vm_frag_ptes - add fragment information to PTEs
  *
@@ -1556,6 +1602,7 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 	if (r)
 		goto error_free_page_directory;
 	vm->last_eviction_counter = atomic64_read(&adev->num_evictions);
+	vm->shadow_sync_fence = NULL;
 
 	return 0;
 
@@ -1613,6 +1660,7 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 		amdgpu_bo_unref(&vm->page_directory->shadow);
 	amdgpu_bo_unref(&vm->page_directory);
 	fence_put(vm->page_directory_fence);
+	fence_put(vm->shadow_sync_fence);
 }
 
 /**
-- 
1.9.1