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author | 2010-08-16 13:32:24 +0900 | |
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committer | 2010-08-16 13:32:24 +0900 | |
commit | bbcf6e8b66ab2fb5ddab4d0fe40c2e6a5ebe5301 (patch) | |
tree | 071fa9f86dc04a16570be367d04cff3b00c694ad /drivers/gpu/drm/drm_global.c | |
parent | sh: Use __GFP_ZERO for dma_generic_alloc_coherent(). (diff) | |
parent | Linux 2.6.36-rc1 (diff) | |
download | linux-dev-bbcf6e8b66ab2fb5ddab4d0fe40c2e6a5ebe5301.tar.xz linux-dev-bbcf6e8b66ab2fb5ddab4d0fe40c2e6a5ebe5301.zip |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
arch/sh/include/asm/Kbuild
drivers/Makefile
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/gpu/drm/drm_global.c')
-rw-r--r-- | drivers/gpu/drm/drm_global.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_global.c b/drivers/gpu/drm/drm_global.c new file mode 100644 index 000000000000..c87dc96444de --- /dev/null +++ b/drivers/gpu/drm/drm_global.c @@ -0,0 +1,112 @@ +/************************************************************************** + * + * 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 <linux/mutex.h> +#include <linux/slab.h> +#include <linux/module.h> +#include "drm_global.h" + +struct drm_global_item { + struct mutex 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]; + mutex_init(&item->mutex); + 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]; + BUG_ON(item->object != NULL); + BUG_ON(item->refcount != 0); + } +} + +int drm_global_item_ref(struct drm_global_reference *ref) +{ + int ret; + struct drm_global_item *item = &glob[ref->global_type]; + void *object; + + mutex_lock(&item->mutex); + if (item->refcount == 0) { + item->object = kzalloc(ref->size, GFP_KERNEL); + 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; + object = item->object; + mutex_unlock(&item->mutex); + return 0; +out_err: + mutex_unlock(&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]; + + mutex_lock(&item->mutex); + BUG_ON(item->refcount == 0); + BUG_ON(ref->object != item->object); + if (--item->refcount == 0) { + ref->release(ref); + item->object = NULL; + } + mutex_unlock(&item->mutex); +} +EXPORT_SYMBOL(drm_global_item_unref); + |