drm/amdkfd: Use prange->list head for insert_list

There are seven list_heads in struct svm_range: list, update_list,
remove_list, insert_list, svm_bo_list, deferred_list, child_list. This
patch and the next one remove two of them that are redundant.

The insert_list head was only used for new ranges that are not on the
svms->list yet. So we can use that list head for keeping track of
new ranges before they get added, and use list_move_tail to move them
to the svms->list when ready.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

@@ -107,7 +107,7 @@ static void svm_range_add_to_svms(struct svm_range *prange)
 	pr_debug("svms 0x%p prange 0x%p [0x%lx 0x%lx]\n", prange->svms,
 		 prange, prange->start, prange->last);
 
-	list_add_tail(&prange->list, &prange->svms->list);
+	list_move_tail(&prange->list, &prange->svms->list);
 	prange->it_node.start = prange->start;
 	prange->it_node.last = prange->last;
 	interval_tree_insert(&prange->it_node, &prange->svms->objects);
@@ -296,7 +296,6 @@ svm_range *svm_range_new(struct svm_range_list *svms, uint64_t start,
 	INIT_LIST_HEAD(&prange->list);
 	INIT_LIST_HEAD(&prange->update_list);
 	INIT_LIST_HEAD(&prange->remove_list);
-	INIT_LIST_HEAD(&prange->insert_list);
 	INIT_LIST_HEAD(&prange->svm_bo_list);
 	INIT_LIST_HEAD(&prange->deferred_list);
 	INIT_LIST_HEAD(&prange->child_list);
@@ -1018,7 +1017,7 @@ svm_range_split_tail(struct svm_range *prange,
 	int r = svm_range_split(prange, prange->start, new_last, &tail);
 
 	if (!r)
-		list_add(&tail->insert_list, insert_list);
+		list_add(&tail->list, insert_list);
 	return r;
 }
 
@@ -1030,7 +1029,7 @@ svm_range_split_head(struct svm_range *prange,
 	int r = svm_range_split(prange, new_start, prange->last, &head);
 
 	if (!r)
-		list_add(&head->insert_list, insert_list);
+		list_add(&head->list, insert_list);
 	return r;
 }
 
@@ -1899,7 +1898,7 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
 			}
 
 			list_add(&old->remove_list, remove_list);
-			list_add(&prange->insert_list, insert_list);
+			list_add(&prange->list, insert_list);
 			list_add(&prange->update_list, update_list);
 
 			if (node->start < start) {
@@ -1931,7 +1930,7 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
 				goto out;
 			}
 
-			list_add(&prange->insert_list, insert_list);
+			list_add(&prange->list, insert_list);
 			list_add(&prange->update_list, update_list);
 		}
 
@@ -1946,13 +1945,13 @@ svm_range_add(struct kfd_process *p, uint64_t start, uint64_t size,
 			r = -ENOMEM;
 			goto out;
 		}
-		list_add(&prange->insert_list, insert_list);
+		list_add(&prange->list, insert_list);
 		list_add(&prange->update_list, update_list);
 	}
 
 out:
 	if (r)
-		list_for_each_entry_safe(prange, tmp, insert_list, insert_list)
+		list_for_each_entry_safe(prange, tmp, insert_list, list)
 			svm_range_free(prange);
 
 	return r;
@@ -3236,7 +3235,7 @@ svm_range_set_attr(struct kfd_process *p, uint64_t start, uint64_t size,
 		goto out;
 	}
 	/* Apply changes as a transaction */
-	list_for_each_entry_safe(prange, next, &insert_list, insert_list) {
+	list_for_each_entry_safe(prange, next, &insert_list, list) {
 		svm_range_add_to_svms(prange);
 		svm_range_add_notifier_locked(mm, prange);
 	}

drivers/gpu/drm/amd/amdkfd/kfd_svm.h

@@ -77,7 +77,6 @@ struct svm_work_list_item {
  * @list:       link list node, used to scan all ranges of svms
  * @update_list:link list node used to add to update_list
  * @remove_list:link list node used to add to remove list
- * @insert_list:link list node used to add to insert list
  * @mapping:    bo_va mapping structure to create and update GPU page table
  * @npages:     number of pages
  * @dma_addr:   dma mapping address on each GPU for system memory physical page
@@ -114,7 +113,6 @@ struct svm_range {
 	struct list_head		list;
 	struct list_head		update_list;
 	struct list_head		remove_list;
-	struct list_head		insert_list;
 	uint64_t			npages;
 	dma_addr_t			*dma_addr[MAX_GPU_INSTANCE];
 	struct ttm_resource		*ttm_res;