1 | /* $NetBSD: nouveau_core_event.c,v 1.1.1.1 2014/08/06 12:36:23 riastradh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright 2013 Red Hat Inc. |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a |
7 | * copy of this software and associated documentation files (the "Software"), |
8 | * to deal in the Software without restriction, including without limitation |
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
10 | * and/or sell copies of the Software, and to permit persons to whom the |
11 | * Software is furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
22 | * OTHER DEALINGS IN THE SOFTWARE. |
23 | */ |
24 | |
25 | #include <sys/cdefs.h> |
26 | __KERNEL_RCSID(0, "$NetBSD: nouveau_core_event.c,v 1.1.1.1 2014/08/06 12:36:23 riastradh Exp $" ); |
27 | |
28 | #include <core/os.h> |
29 | #include <core/event.h> |
30 | |
31 | void |
32 | nouveau_event_put(struct nouveau_eventh *handler) |
33 | { |
34 | struct nouveau_event *event = handler->event; |
35 | unsigned long flags; |
36 | if (__test_and_clear_bit(NVKM_EVENT_ENABLE, &handler->flags)) { |
37 | spin_lock_irqsave(&event->refs_lock, flags); |
38 | if (!--event->index[handler->index].refs) { |
39 | if (event->disable) |
40 | event->disable(event, handler->index); |
41 | } |
42 | spin_unlock_irqrestore(&event->refs_lock, flags); |
43 | } |
44 | } |
45 | |
46 | void |
47 | nouveau_event_get(struct nouveau_eventh *handler) |
48 | { |
49 | struct nouveau_event *event = handler->event; |
50 | unsigned long flags; |
51 | if (!__test_and_set_bit(NVKM_EVENT_ENABLE, &handler->flags)) { |
52 | spin_lock_irqsave(&event->refs_lock, flags); |
53 | if (!event->index[handler->index].refs++) { |
54 | if (event->enable) |
55 | event->enable(event, handler->index); |
56 | } |
57 | spin_unlock_irqrestore(&event->refs_lock, flags); |
58 | } |
59 | } |
60 | |
61 | static void |
62 | nouveau_event_fini(struct nouveau_eventh *handler) |
63 | { |
64 | struct nouveau_event *event = handler->event; |
65 | unsigned long flags; |
66 | nouveau_event_put(handler); |
67 | spin_lock_irqsave(&event->list_lock, flags); |
68 | list_del(&handler->head); |
69 | spin_unlock_irqrestore(&event->list_lock, flags); |
70 | } |
71 | |
72 | static int |
73 | nouveau_event_init(struct nouveau_event *event, int index, |
74 | int (*func)(void *, int), void *priv, |
75 | struct nouveau_eventh *handler) |
76 | { |
77 | unsigned long flags; |
78 | |
79 | if (index >= event->index_nr) |
80 | return -EINVAL; |
81 | |
82 | handler->event = event; |
83 | handler->flags = 0; |
84 | handler->index = index; |
85 | handler->func = func; |
86 | handler->priv = priv; |
87 | |
88 | spin_lock_irqsave(&event->list_lock, flags); |
89 | list_add_tail(&handler->head, &event->index[index].list); |
90 | spin_unlock_irqrestore(&event->list_lock, flags); |
91 | return 0; |
92 | } |
93 | |
94 | int |
95 | nouveau_event_new(struct nouveau_event *event, int index, |
96 | int (*func)(void *, int), void *priv, |
97 | struct nouveau_eventh **phandler) |
98 | { |
99 | struct nouveau_eventh *handler; |
100 | int ret = -ENOMEM; |
101 | |
102 | handler = *phandler = kmalloc(sizeof(*handler), GFP_KERNEL); |
103 | if (handler) { |
104 | ret = nouveau_event_init(event, index, func, priv, handler); |
105 | if (ret) |
106 | kfree(handler); |
107 | } |
108 | |
109 | return ret; |
110 | } |
111 | |
112 | void |
113 | nouveau_event_ref(struct nouveau_eventh *handler, struct nouveau_eventh **ref) |
114 | { |
115 | BUG_ON(handler != NULL); |
116 | if (*ref) { |
117 | nouveau_event_fini(*ref); |
118 | kfree(*ref); |
119 | } |
120 | *ref = handler; |
121 | } |
122 | |
123 | void |
124 | nouveau_event_trigger(struct nouveau_event *event, int index) |
125 | { |
126 | struct nouveau_eventh *handler; |
127 | unsigned long flags; |
128 | |
129 | if (WARN_ON(index >= event->index_nr)) |
130 | return; |
131 | |
132 | spin_lock_irqsave(&event->list_lock, flags); |
133 | list_for_each_entry(handler, &event->index[index].list, head) { |
134 | if (test_bit(NVKM_EVENT_ENABLE, &handler->flags) && |
135 | handler->func(handler->priv, index) == NVKM_EVENT_DROP) |
136 | nouveau_event_put(handler); |
137 | } |
138 | spin_unlock_irqrestore(&event->list_lock, flags); |
139 | } |
140 | |
141 | void |
142 | nouveau_event_destroy(struct nouveau_event **pevent) |
143 | { |
144 | struct nouveau_event *event = *pevent; |
145 | if (event) { |
146 | kfree(event); |
147 | *pevent = NULL; |
148 | } |
149 | } |
150 | |
151 | int |
152 | nouveau_event_create(int index_nr, struct nouveau_event **pevent) |
153 | { |
154 | struct nouveau_event *event; |
155 | int i; |
156 | |
157 | event = *pevent = kzalloc(sizeof(*event) + index_nr * |
158 | sizeof(event->index[0]), GFP_KERNEL); |
159 | if (!event) |
160 | return -ENOMEM; |
161 | |
162 | spin_lock_init(&event->list_lock); |
163 | spin_lock_init(&event->refs_lock); |
164 | for (i = 0; i < index_nr; i++) |
165 | INIT_LIST_HEAD(&event->index[i].list); |
166 | event->index_nr = index_nr; |
167 | return 0; |
168 | } |
169 | |