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
nop_fence_notify(struct i915_sw_fence * fence,enum i915_sw_fence_notify state)30 nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
31 {
32 return NOTIFY_DONE;
33 }
34
__onstack_fence_init(struct i915_sw_fence * fence,const char * name,struct lock_class_key * key)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
onstack_fence_fini(struct i915_sw_fence * fence)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
timed_fence_wake(struct timer_list * t)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
timed_fence_init(struct timed_fence * tf,unsigned long expires)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
timed_fence_fini(struct timed_fence * tf)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
