1 /* 2 * Copyright © 2017 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 */ 24 25 #include "lib_sw_fence.h" 26 27 /* Small library of different fence types useful for writing tests */ 28 29 static int __i915_sw_fence_call 30 nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) 31 { 32 return NOTIFY_DONE; 33 } 34 35 void __onstack_fence_init(struct i915_sw_fence *fence, 36 const char *name, 37 struct lock_class_key *key) 38 { 39 debug_fence_init_onstack(fence); 40 41 __init_waitqueue_head(&fence->wait, name, key); 42 atomic_set(&fence->pending, 1); 43 fence->error = 0; 44 fence->flags = (unsigned long)nop_fence_notify; 45 } 46 47 void onstack_fence_fini(struct i915_sw_fence *fence) 48 { 49 if (!fence->flags) 50 return; 51 52 i915_sw_fence_commit(fence); 53 i915_sw_fence_fini(fence); 54 } 55 56 static void timed_fence_wake(struct timer_list *t) 57 { 58 struct timed_fence *tf = from_timer(tf, t, timer); 59 60 i915_sw_fence_commit(&tf->fence); 61 } 62 63 void timed_fence_init(struct timed_fence *tf, unsigned long expires) 64 { 65 onstack_fence_init(&tf->fence); 66 67 timer_setup_on_stack(&tf->timer, timed_fence_wake, 0); 68 69 if (time_after(expires, jiffies)) 70 mod_timer(&tf->timer, expires); 71 else 72 i915_sw_fence_commit(&tf->fence); 73 } 74 75 void timed_fence_fini(struct timed_fence *tf) 76 { 77 if (del_timer_sync(&tf->timer)) 78 i915_sw_fence_commit(&tf->fence); 79 80 destroy_timer_on_stack(&tf->timer); 81 i915_sw_fence_fini(&tf->fence); 82 } 83 84 struct heap_fence { 85 struct i915_sw_fence fence; 86 union { 87 struct kref ref; 88 struct rcu_head rcu; 89 }; 90 }; 91 92 static int __i915_sw_fence_call 93 heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) 94 { 95 struct heap_fence *h = container_of(fence, typeof(*h), fence); 96 97 switch (state) { 98 case FENCE_COMPLETE: 99 break; 100 101 case FENCE_FREE: 102 heap_fence_put(&h->fence); 103 } 104 105 return NOTIFY_DONE; 106 } 107 108 struct i915_sw_fence *heap_fence_create(gfp_t gfp) 109 { 110 struct heap_fence *h; 111 112 h = kmalloc(sizeof(*h), gfp); 113 if (!h) 114 return NULL; 115 116 i915_sw_fence_init(&h->fence, heap_fence_notify); 117 refcount_set(&h->ref.refcount, 2); 118 119 return &h->fence; 120 } 121 122 static void heap_fence_release(struct kref *ref) 123 { 124 struct heap_fence *h = container_of(ref, typeof(*h), ref); 125 126 i915_sw_fence_fini(&h->fence); 127 128 kfree_rcu(h, rcu); 129 } 130 131 void heap_fence_put(struct i915_sw_fence *fence) 132 { 133 struct heap_fence *h = container_of(fence, typeof(*h), fence); 134 135 kref_put(&h->ref, heap_fence_release); 136 } 137