nvkm/core/event.c

0001 /*
0002  * Copyright 2013-2014 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  */
0022 #include <core/event.h>
0023 #include <core/notify.h>
0024
0025 void
0026 nvkm_event_put(struct nvkm_event *event, u32 types, int index)
0027 {
0028     assert_spin_locked(&event->refs_lock);
0029     while (types) {
0030         int type = __ffs(types); types &= ~(1 << type);
0031         if (--event->refs[index * event->types_nr + type] == 0) {
0032             if (event->func->fini)
0033                 event->func->fini(event, 1 << type, index);
0034         }
0035     }
0036 }
0037
0038 void
0039 nvkm_event_get(struct nvkm_event *event, u32 types, int index)
0040 {
0041     assert_spin_locked(&event->refs_lock);
0042     while (types) {
0043         int type = __ffs(types); types &= ~(1 << type);
0044         if (++event->refs[index * event->types_nr + type] == 1) {
0045             if (event->func->init)
0046                 event->func->init(event, 1 << type, index);
0047         }
0048     }
0049 }
0050
0051 void
0052 nvkm_event_send(struct nvkm_event *event, u32 types, int index,
0053         void *data, u32 size)
0054 {
0055     struct nvkm_notify *notify;
0056     unsigned long flags;
0057
0058     if (!event->refs || WARN_ON(index >= event->index_nr))
0059         return;
0060
0061     spin_lock_irqsave(&event->list_lock, flags);
0062     list_for_each_entry(notify, &event->list, head) {
0063         if (notify->index == index && (notify->types & types)) {
0064             if (event->func->send) {
0065                 event->func->send(data, size, notify);
0066                 continue;
0067             }
0068             nvkm_notify_send(notify, data, size);
0069         }
0070     }
0071     spin_unlock_irqrestore(&event->list_lock, flags);
0072 }
0073
0074 void
0075 nvkm_event_fini(struct nvkm_event *event)
0076 {
0077     if (event->refs) {
0078         kfree(event->refs);
0079         event->refs = NULL;
0080     }
0081 }
0082
0083 int
0084 nvkm_event_init(const struct nvkm_event_func *func, int types_nr, int index_nr,
0085         struct nvkm_event *event)
0086 {
0087     event->refs = kzalloc(array3_size(index_nr, types_nr,
0088                       sizeof(*event->refs)),
0089                   GFP_KERNEL);
0090     if (!event->refs)
0091         return -ENOMEM;
0092
0093     event->func = func;
0094     event->types_nr = types_nr;
0095     event->index_nr = index_nr;
0096     spin_lock_init(&event->refs_lock);
0097     spin_lock_init(&event->list_lock);
0098     INIT_LIST_HEAD(&event->list);
0099     return 0;
0100 }