LXR linux/drivers/gpu/drm/nouveau/core/core/event.c

   1/*
   2 * Copyright 2013 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
  23#include <core/os.h>
  24#include <core/event.h>
  25
  26static void
  27nouveau_event_put_locked(struct nouveau_event *event, int index,
  28                         struct nouveau_eventh *handler)
  29{
  30        if (!--event->index[index].refs) {
  31                if (event->disable)
  32                        event->disable(event, index);
  33        }
  34        list_del(&handler->head);
  35}
  36
  37void
  38nouveau_event_put(struct nouveau_event *event, int index,
  39                  struct nouveau_eventh *handler)
  40{
  41        unsigned long flags;
  42
  43        spin_lock_irqsave(&event->lock, flags);
  44        if (index < event->index_nr)
  45                nouveau_event_put_locked(event, index, handler);
  46        spin_unlock_irqrestore(&event->lock, flags);
  47}
  48
  49void
  50nouveau_event_get(struct nouveau_event *event, int index,
  51                  struct nouveau_eventh *handler)
  52{
  53        unsigned long flags;
  54
  55        spin_lock_irqsave(&event->lock, flags);
  56        if (index < event->index_nr) {
  57                list_add(&handler->head, &event->index[index].list);
  58                if (!event->index[index].refs++) {
  59                        if (event->enable)
  60                                event->enable(event, index);
  61                }
  62        }
  63        spin_unlock_irqrestore(&event->lock, flags);
  64}
  65
  66void
  67nouveau_event_trigger(struct nouveau_event *event, int index)
  68{
  69        struct nouveau_eventh *handler, *temp;
  70        unsigned long flags;
  71
  72        if (index >= event->index_nr)
  73                return;
  74
  75        spin_lock_irqsave(&event->lock, flags);
  76        list_for_each_entry_safe(handler, temp, &event->index[index].list, head) {
  77                if (handler->func(handler, index) == NVKM_EVENT_DROP) {
  78                        nouveau_event_put_locked(event, index, handler);
  79                }
  80        }
  81        spin_unlock_irqrestore(&event->lock, flags);
  82}
  83
  84void
  85nouveau_event_destroy(struct nouveau_event **pevent)
  86{
  87        struct nouveau_event *event = *pevent;
  88        if (event) {
  89                kfree(event);
  90                *pevent = NULL;
  91        }
  92}
  93
  94int
  95nouveau_event_create(int index_nr, struct nouveau_event **pevent)
  96{
  97        struct nouveau_event *event;
  98        int i;
  99
 100        event = *pevent = kzalloc(sizeof(*event) + index_nr *
 101                                  sizeof(event->index[0]), GFP_KERNEL);
 102        if (!event)
 103                return -ENOMEM;
 104
 105        spin_lock_init(&event->lock);
 106        for (i = 0; i < index_nr; i++)
 107                INIT_LIST_HEAD(&event->index[i].list);
 108        event->index_nr = index_nr;
 109        return 0;
 110}
 111