drm/amdkfd: add pinned BOs to kfd_bo_list

The kfd_bo_list is used to restore process BOs after
evictions. As page tables could be destroyed during
evictions, we should also update pinned BOs' page tables
during restoring to make sure they are valid.

So for pinned BOs,
1, Validate them and update their page tables.
2, Don't add eviction fence for them.

v2:
 - Don't handle pinned ones specially in BO validation.(Felix)
Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

@@ -1918,9 +1918,6 @@ int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct amdgpu_device *adev,
 		return -EINVAL;
 	}
 
-	/* delete kgd_mem from kfd_bo_list to avoid re-validating
-	 * this BO in BO's restoring after eviction.
-	 */
 	mutex_lock(&mem->process_info->lock);
 
 	ret = amdgpu_bo_reserve(bo, true);
@@ -1943,7 +1940,6 @@ int amdgpu_amdkfd_gpuvm_map_gtt_bo_to_kernel(struct amdgpu_device *adev,
 
 	amdgpu_amdkfd_remove_eviction_fence(
 		bo, mem->process_info->eviction_fence);
-	list_del_init(&mem->validate_list.head);
 
 	if (size)
 		*size = amdgpu_bo_size(bo);
@@ -2512,12 +2508,15 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
 	process_info->eviction_fence = new_fence;
 	*ef = dma_fence_get(&new_fence->base);
 
-	/* Attach new eviction fence to all BOs */
+	/* Attach new eviction fence to all BOs except pinned ones */
 	list_for_each_entry(mem, &process_info->kfd_bo_list,
-		validate_list.head)
+		validate_list.head) {
+		if (mem->bo->tbo.pin_count)
+			continue;
+
 		amdgpu_bo_fence(mem->bo,
 			&process_info->eviction_fence->base, true);
-
+	}
 	/* Attach eviction fence to PD / PT BOs */
 	list_for_each_entry(peer_vm, &process_info->vm_list_head,
 			    vm_list_node) {