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 |
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(wq_head: &fence->wait, name, key); |
42 | atomic_set(v: &fence->pending, i: 1); |
43 | fence->error = 0; |
44 | fence->fn = nop_fence_notify; |
45 | } |
46 | |
47 | void onstack_fence_fini(struct i915_sw_fence *fence) |
48 | { |
49 | if (!fence->fn) |
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(fence: &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(timer: &tf->timer, expires); |
71 | else |
72 | i915_sw_fence_commit(fence: &tf->fence); |
73 | } |
74 | |
75 | void timed_fence_fini(struct timed_fence *tf) |
76 | { |
77 | if (del_timer_sync(timer: &tf->timer)) |
78 | i915_sw_fence_commit(fence: &tf->fence); |
79 | |
80 | destroy_timer_on_stack(timer: &tf->timer); |
81 | i915_sw_fence_fini(fence: &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 |
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(fence: &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(size: sizeof(*h), flags: gfp); |
113 | if (!h) |
114 | return NULL; |
115 | |
116 | i915_sw_fence_init(&h->fence, heap_fence_notify); |
117 | refcount_set(r: &h->ref.refcount, n: 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(fence: &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(kref: &h->ref, release: heap_fence_release); |
136 | } |
137 | |