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25#include "lib_sw_fence.h"
26
27
28
29static int __i915_sw_fence_call
30nop_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
31{
32 return NOTIFY_DONE;
33}
34
35void __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
47void 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
56static 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
63void 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
75void 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
84struct heap_fence {
85 struct i915_sw_fence fence;
86 union {
87 struct kref ref;
88 struct rcu_head rcu;
89 };
90};
91
92static int __i915_sw_fence_call
93heap_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
108struct 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
122static 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
131void 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