freebsd-dev/sys/dev/drm2/drm_global.c
2022-04-13 16:08:22 -07:00

116 lines
3.1 KiB
C

/**************************************************************************
*
* Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/*
* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <dev/drm2/drmP.h>
#include <dev/drm2/drm_global.h>
MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items");
struct drm_global_item {
struct sx mutex;
void *object;
int refcount;
};
static struct drm_global_item glob[DRM_GLOBAL_NUM];
void drm_global_init(void)
{
int i;
for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
struct drm_global_item *item = &glob[i];
sx_init(&item->mutex, "drmgi");
item->object = NULL;
item->refcount = 0;
}
}
void drm_global_release(void)
{
int i;
for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
struct drm_global_item *item = &glob[i];
MPASS(item->object == NULL);
MPASS(item->refcount == 0);
sx_destroy(&item->mutex);
}
}
int drm_global_item_ref(struct drm_global_reference *ref)
{
int ret;
struct drm_global_item *item = &glob[ref->global_type];
sx_xlock(&item->mutex);
if (item->refcount == 0) {
item->object = malloc(ref->size, M_DRM_GLOBAL,
M_NOWAIT | M_ZERO);
if (unlikely(item->object == NULL)) {
ret = -ENOMEM;
goto out_err;
}
ref->object = item->object;
ret = ref->init(ref);
if (unlikely(ret != 0))
goto out_err;
}
++item->refcount;
ref->object = item->object;
sx_xunlock(&item->mutex);
return 0;
out_err:
sx_xunlock(&item->mutex);
item->object = NULL;
return ret;
}
EXPORT_SYMBOL(drm_global_item_ref);
void drm_global_item_unref(struct drm_global_reference *ref)
{
struct drm_global_item *item = &glob[ref->global_type];
sx_xlock(&item->mutex);
MPASS(item->refcount != 0);
MPASS(ref->object == item->object);
if (--item->refcount == 0) {
ref->release(ref);
free(item->object, M_DRM_GLOBAL);
item->object = NULL;
}
sx_xunlock(&item->mutex);
}
EXPORT_SYMBOL(drm_global_item_unref);