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->flags = (unsigned long)nop_fence_notify; 44 } 45 46 void onstack_fence_fini(struct i915_sw_fence *fence) 47 { 48 i915_sw_fence_commit(fence); 49 i915_sw_fence_fini(fence); 50 } 51 52 static void timed_fence_wake(struct timer_list *t) 53 { 54 struct timed_fence *tf = from_timer(tf, t, timer); 55 56 i915_sw_fence_commit(&tf->fence); 57 } 58 59 void timed_fence_init(struct timed_fence *tf, unsigned long expires) 60 { 61 onstack_fence_init(&tf->fence); 62 63 timer_setup_on_stack(&tf->timer, timed_fence_wake, 0); 64 65 if (time_after(expires, jiffies)) 66 mod_timer(&tf->timer, expires); 67 else 68 i915_sw_fence_commit(&tf->fence); 69 } 70 71 void timed_fence_fini(struct timed_fence *tf) 72 { 73 if (del_timer_sync(&tf->timer)) 74 i915_sw_fence_commit(&tf->fence); 75 76 destroy_timer_on_stack(&tf->timer); 77 i915_sw_fence_fini(&tf->fence); 78 } 79 80 struct heap_fence { 81 struct i915_sw_fence fence; 82 union { 83 struct kref ref; 84 struct rcu_head rcu; 85 }; 86 }; 87 88 static int __i915_sw_fence_call 89 heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) 90 { 91 struct heap_fence *h = container_of(fence, typeof(*h), fence); 92 93 switch (state) { 94 case FENCE_COMPLETE: 95 break; 96 97 case FENCE_FREE: 98 heap_fence_put(&h->fence); 99 } 100 101 return NOTIFY_DONE; 102 } 103 104 struct i915_sw_fence *heap_fence_create(gfp_t gfp) 105 { 106 struct heap_fence *h; 107 108 h = kmalloc(sizeof(*h), gfp); 109 if (!h) 110 return NULL; 111 112 i915_sw_fence_init(&h->fence, heap_fence_notify); 113 refcount_set(&h->ref.refcount, 2); 114 115 return &h->fence; 116 } 117 118 static void heap_fence_release(struct kref *ref) 119 { 120 struct heap_fence *h = container_of(ref, typeof(*h), ref); 121 122 i915_sw_fence_fini(&h->fence); 123 124 kfree_rcu(h, rcu); 125 } 126 127 void heap_fence_put(struct i915_sw_fence *fence) 128 { 129 struct heap_fence *h = container_of(fence, typeof(*h), fence); 130 131 kref_put(&h->ref, heap_fence_release); 132 } 133