45  * The reservation object provides a mechanism to manage shared and
48  * write operations) or N shared fences (read operations).  The RCU
67 	list = kmalloc(struct_size(list, shared, shared_max), GFP_KERNEL);  in dma_resv_list_alloc()
71 	list->shared_max = (ksize(list) - offsetof(typeof(*list), shared)) /  in dma_resv_list_alloc()
72 		sizeof(*list->shared);  in dma_resv_list_alloc()
91 		dma_fence_put(rcu_dereference_protected(list->shared[i], true));  in dma_resv_list_free()
134  * dma_resv_reserve_shared - Reserve space to add shared fences to
174 		fence = rcu_dereference_protected(old->shared[i],  in dma_resv_reserve_shared()
177 			RCU_INIT_POINTER(new->shared[--k], fence);  in dma_resv_reserve_shared()
179 			RCU_INIT_POINTER(new->shared[j++], fence);  in dma_resv_reserve_shared()
187 	 * active (unsignaled) shared fences. Individual fences and the  in dma_resv_reserve_shared()
200 		fence = rcu_dereference_protected(new->shared[i],  in dma_resv_reserve_shared()
212  * dma_resv_reset_shared_max - reset shared fences for debugging
215  * Reset the number of pre-reserved shared slots to test that drivers do
225 	/* Test shared fence slot reservation */  in dma_resv_reset_shared_max()
233  * dma_resv_add_shared_fence - Add a fence to a shared slot
235  * @fence: the shared fence to add
237  * Add a fence to a shared slot, obj->lock must be held, and
257 		old = rcu_dereference_protected(fobj->shared[i],  in dma_resv_add_shared_fence()
269 	RCU_INIT_POINTER(fobj->shared[i], fence);  in dma_resv_add_shared_fence()
281  * @fence: the shared fence to add
307 	/* inplace update, no shared fences */  in dma_resv_add_excl_fence()
309 		dma_fence_put(rcu_dereference_protected(old->shared[i],  in dma_resv_add_excl_fence()
356 			fence = rcu_dereference(src_list->shared[i]);  in dma_resv_copy_fences()
372 			dst = &dst_list->shared[dst_list->shared_count++];  in dma_resv_copy_fences()
399  * dma_resv_get_fences - Get an object's shared and exclusive
403  * @pshared_count: the number of shared fences returned
404  * @pshared: the array of shared fence ptrs returned (array is krealloc'd to
409  * shared fences as well. Returns either zero or -ENOMEM.
415 	struct dma_fence **shared = NULL;  in dma_resv_get_fences()  local
436 			sz += sizeof(*shared) * fobj->shared_max;  in dma_resv_get_fences()
439 			sz += sizeof(*shared);  in dma_resv_get_fences()
444 			nshared = krealloc(shared, sz,  in dma_resv_get_fences()
452 				nshared = krealloc(shared, sz, GFP_KERNEL);  in dma_resv_get_fences()
454 					shared = nshared;  in dma_resv_get_fences()
461 			shared = nshared;  in dma_resv_get_fences()
464 				shared[i] = rcu_dereference(fobj->shared[i]);  in dma_resv_get_fences()
465 				if (!dma_fence_get_rcu(shared[i]))  in dma_resv_get_fences()
472 				dma_fence_put(shared[i]);  in dma_resv_get_fences()
485 		shared[shared_count++] = fence_excl;  in dma_resv_get_fences()
488 		kfree(shared);  in dma_resv_get_fences()
489 		shared = NULL;  in dma_resv_get_fences()
493 	*pshared = shared;  in dma_resv_get_fences()
500  * shared and/or exclusive fences.
549 			lfence = rcu_dereference(fobj->shared[i]);  in dma_resv_wait_timeout()
633 			fence = rcu_dereference(fobj->shared[i]);  in dma_resv_test_signaled()