| 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 | |