drm/amdkfd: add svm_bo reference for eviction fence

[why]
As part of the SVM functionality, the eviction mechanism used for
SVM_BOs is different. This mechanism uses one eviction fence per prange,
instead of one fence per kfd_process.

[how]
A svm_bo reference to amdgpu_amdkfd_fence to allow differentiate between
SVM_BO or regular BO evictions. This also include modifications to set the
reference at the fence creation call.
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

@@ -75,6 +75,7 @@ struct amdgpu_amdkfd_fence {
 	struct mm_struct *mm;
 	spinlock_t lock;
 	char timeline_name[TASK_COMM_LEN];
+	struct svm_range_bo *svm_bo;
 };
 
 struct amdgpu_kfd_dev {
@@ -148,7 +149,8 @@ int amdgpu_queue_mask_bit_to_set_resource_bit(struct amdgpu_device *adev,
 					int queue_bit);
 
 struct amdgpu_amdkfd_fence *amdgpu_amdkfd_fence_create(u64 context,
-								struct mm_struct *mm);
+				struct mm_struct *mm,
+				struct svm_range_bo *svm_bo);
 #if IS_ENABLED(CONFIG_HSA_AMD)
 bool amdkfd_fence_check_mm(struct dma_fence *f, struct mm_struct *mm);
 struct amdgpu_amdkfd_fence *to_amdgpu_amdkfd_fence(struct dma_fence *f);

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

@@ -60,7 +60,8 @@ static atomic_t fence_seq = ATOMIC_INIT(0);
  */
 
 struct amdgpu_amdkfd_fence *amdgpu_amdkfd_fence_create(u64 context,
-						       struct mm_struct *mm)
+				struct mm_struct *mm,
+				struct svm_range_bo *svm_bo)
 {
 	struct amdgpu_amdkfd_fence *fence;
 
@@ -73,7 +74,7 @@ struct amdgpu_amdkfd_fence *amdgpu_amdkfd_fence_create(u64 context,
 	fence->mm = mm;
 	get_task_comm(fence->timeline_name, current);
 	spin_lock_init(&fence->lock);
-
+	fence->svm_bo = svm_bo;
 	dma_fence_init(&fence->base, &amdkfd_fence_ops, &fence->lock,
 		   context, atomic_inc_return(&fence_seq));
 

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

@@ -972,7 +972,8 @@ static int init_kfd_vm(struct amdgpu_vm *vm, void **process_info,
 
 		info->eviction_fence =
 			amdgpu_amdkfd_fence_create(dma_fence_context_alloc(1),
-						   current->mm);
+						   current->mm,
+						   NULL);
 		if (!info->eviction_fence) {
 			pr_err("Failed to create eviction fence\n");
 			ret = -ENOMEM;
@@ -2162,7 +2163,8 @@ int amdgpu_amdkfd_gpuvm_restore_process_bos(void *info, struct dma_fence **ef)
 	 */
 	new_fence = amdgpu_amdkfd_fence_create(
 				process_info->eviction_fence->base.context,
-				process_info->eviction_fence->mm);
+				process_info->eviction_fence->mm,
+				NULL);
 	if (!new_fence) {
 		pr_err("Failed to create eviction fence\n");
 		ret = -ENOMEM;