| /* |
| * Copyright 2013 Red Hat Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <core/os.h> |
| #include <core/event.h> |
| |
| void |
| nouveau_event_put(struct nouveau_eventh *handler) |
| { |
| struct nouveau_event *event = handler->event; |
| unsigned long flags; |
| if (__test_and_clear_bit(NVKM_EVENT_ENABLE, &handler->flags)) { |
| spin_lock_irqsave(&event->refs_lock, flags); |
| if (!--event->index[handler->index].refs) { |
| if (event->disable) |
| event->disable(event, handler->index); |
| } |
| spin_unlock_irqrestore(&event->refs_lock, flags); |
| } |
| } |
| |
| void |
| nouveau_event_get(struct nouveau_eventh *handler) |
| { |
| struct nouveau_event *event = handler->event; |
| unsigned long flags; |
| if (!__test_and_set_bit(NVKM_EVENT_ENABLE, &handler->flags)) { |
| spin_lock_irqsave(&event->refs_lock, flags); |
| if (!event->index[handler->index].refs++) { |
| if (event->enable) |
| event->enable(event, handler->index); |
| } |
| spin_unlock_irqrestore(&event->refs_lock, flags); |
| } |
| } |
| |
| static void |
| nouveau_event_fini(struct nouveau_eventh *handler) |
| { |
| struct nouveau_event *event = handler->event; |
| unsigned long flags; |
| nouveau_event_put(handler); |
| spin_lock_irqsave(&event->list_lock, flags); |
| list_del(&handler->head); |
| spin_unlock_irqrestore(&event->list_lock, flags); |
| } |
| |
| static int |
| nouveau_event_init(struct nouveau_event *event, int index, |
| int (*func)(void *, int), void *priv, |
| struct nouveau_eventh *handler) |
| { |
| unsigned long flags; |
| |
| if (index >= event->index_nr) |
| return -EINVAL; |
| |
| handler->event = event; |
| handler->flags = 0; |
| handler->index = index; |
| handler->func = func; |
| handler->priv = priv; |
| |
| spin_lock_irqsave(&event->list_lock, flags); |
| list_add_tail(&handler->head, &event->index[index].list); |
| spin_unlock_irqrestore(&event->list_lock, flags); |
| return 0; |
| } |
| |
| int |
| nouveau_event_new(struct nouveau_event *event, int index, |
| int (*func)(void *, int), void *priv, |
| struct nouveau_eventh **phandler) |
| { |
| struct nouveau_eventh *handler; |
| int ret = -ENOMEM; |
| |
| handler = *phandler = kmalloc(sizeof(*handler), GFP_KERNEL); |
| if (handler) { |
| ret = nouveau_event_init(event, index, func, priv, handler); |
| if (ret) |
| kfree(handler); |
| } |
| |
| return ret; |
| } |
| |
| void |
| nouveau_event_ref(struct nouveau_eventh *handler, struct nouveau_eventh **ref) |
| { |
| BUG_ON(handler != NULL); |
| if (*ref) { |
| nouveau_event_fini(*ref); |
| kfree(*ref); |
| } |
| *ref = handler; |
| } |
| |
| void |
| nouveau_event_trigger(struct nouveau_event *event, int index) |
| { |
| struct nouveau_eventh *handler; |
| unsigned long flags; |
| |
| if (WARN_ON(index >= event->index_nr)) |
| return; |
| |
| spin_lock_irqsave(&event->list_lock, flags); |
| list_for_each_entry(handler, &event->index[index].list, head) { |
| if (test_bit(NVKM_EVENT_ENABLE, &handler->flags) && |
| handler->func(handler->priv, index) == NVKM_EVENT_DROP) |
| nouveau_event_put(handler); |
| } |
| spin_unlock_irqrestore(&event->list_lock, flags); |
| } |
| |
| void |
| nouveau_event_destroy(struct nouveau_event **pevent) |
| { |
| struct nouveau_event *event = *pevent; |
| if (event) { |
| kfree(event); |
| *pevent = NULL; |
| } |
| } |
| |
| int |
| nouveau_event_create(int index_nr, struct nouveau_event **pevent) |
| { |
| struct nouveau_event *event; |
| int i; |
| |
| event = *pevent = kzalloc(sizeof(*event) + index_nr * |
| sizeof(event->index[0]), GFP_KERNEL); |
| if (!event) |
| return -ENOMEM; |
| |
| spin_lock_init(&event->list_lock); |
| spin_lock_init(&event->refs_lock); |
| for (i = 0; i < index_nr; i++) |
| INIT_LIST_HEAD(&event->index[i].list); |
| event->index_nr = index_nr; |
| return 0; |
| } |