drivers/gpu/drm/nouveau/nvkm/core/event.c

   1 /*
   2  * Copyright 2013-2014 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22 #include <core/event.h>
  23 #include <core/notify.h>
  24
  25 void
  26 nvkm_event_put(struct nvkm_event *event, u32 types, int index)
  27 {
  28         assert_spin_locked(&event->refs_lock);
  29         while (types) {
  30                 int type = __ffs(types); types &= ~(1 << type);
  31                 if (--event->refs[index * event->types_nr + type] == 0) {
  32                         if (event->func->fini)
  33                                 event->func->fini(event, 1 << type, index);
  34                 }
  35         }
  36 }
  37
  38 void
  39 nvkm_event_get(struct nvkm_event *event, u32 types, int index)
  40 {
  41         assert_spin_locked(&event->refs_lock);
  42         while (types) {
  43                 int type = __ffs(types); types &= ~(1 << type);
  44                 if (++event->refs[index * event->types_nr + type] == 1) {
  45                         if (event->func->init)
  46                                 event->func->init(event, 1 << type, index);
  47                 }
  48         }
  49 }
  50
  51 void
  52 nvkm_event_send(struct nvkm_event *event, u32 types, int index,
  53                 void *data, u32 size)
  54 {
  55         struct nvkm_notify *notify;
  56         unsigned long flags;
  57
  58         if (!event->refs || WARN_ON(index >= event->index_nr))
  59                 return;
  60
  61         spin_lock_irqsave(&event->list_lock, flags);
  62         list_for_each_entry(notify, &event->list, head) {
  63                 if (notify->index == index && (notify->types & types)) {
  64                         if (event->func->send) {
  65                                 event->func->send(data, size, notify);
  66                                 continue;
  67                         }
  68                         nvkm_notify_send(notify, data, size);
  69                 }
  70         }
  71         spin_unlock_irqrestore(&event->list_lock, flags);
  72 }
  73
  74 void
  75 nvkm_event_fini(struct nvkm_event *event)
  76 {
  77         if (event->refs) {
  78                 kfree(event->refs);
  79                 event->refs = NULL;
  80         }
  81 }
  82
  83 int
  84 nvkm_event_init(const struct nvkm_event_func *func, int types_nr, int index_nr,
  85                 struct nvkm_event *event)
  86 {
  87         event->refs = kzalloc(sizeof(*event->refs) * index_nr * types_nr,
  88                               GFP_KERNEL);
  89         if (!event->refs)
  90                 return -ENOMEM;
  91
  92         event->func = func;
  93         event->types_nr = types_nr;
  94         event->index_nr = index_nr;
  95         spin_lock_init(&event->refs_lock);
  96         spin_lock_init(&event->list_lock);
  97         INIT_LIST_HEAD(&event->list);
  98         return 0;
  99 }