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/*
* Header file for reservations for dma-buf and ttm
*
* Copyright(C) 2011 Linaro Limited. All rights reserved.
* Copyright (C) 2012-2013 Canonical Ltd
* Copyright (C) 2012 Texas Instruments
*
* Authors:
* Rob Clark <robdclark@gmail.com>
* Maarten Lankhorst <maarten.lankhorst@canonical.com>
* Thomas Hellstrom <thellstrom-at-vmware-dot-com>
*
* Based on bo.c which bears the following copyright notice,
* but is dual licensed:
*
* Copyright (c) 2006-2009 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.
*/
#ifndef _LINUX_RESERVATION_H
#define _LINUX_RESERVATION_H
#include <linux/ww_mutex.h>
#include <linux/fence.h>
#include <linux/slab.h>
extern struct ww_class reservation_ww_class;
struct reservation_object_list {
u32 shared_count, shared_max;
struct fence *shared[];
};
struct reservation_object {
struct ww_mutex lock;
struct fence *fence_excl;
struct reservation_object_list *fence;
struct reservation_object_list *staged;
};
#define reservation_object_assert_held(obj) \
lockdep_assert_held(&(obj)->lock.base)
static inline void
reservation_object_init(struct reservation_object *obj)
{
ww_mutex_init(&obj->lock, &reservation_ww_class);
obj->fence_excl = NULL;
obj->fence = NULL;
obj->staged = NULL;
}
static inline void
reservation_object_fini(struct reservation_object *obj)
{
int i;
struct reservation_object_list *fobj;
/*
* This object should be dead and all references must have
* been released to it.
*/
if (obj->fence_excl)
fence_put(obj->fence_excl);
fobj = obj->fence;
if (fobj) {
for (i = 0; i < fobj->shared_count; ++i)
fence_put(fobj->shared[i]);
kfree(fobj);
}
kfree(obj->staged);
ww_mutex_destroy(&obj->lock);
}
static inline struct reservation_object_list *
reservation_object_get_list(struct reservation_object *obj)
{
reservation_object_assert_held(obj);
return obj->fence;
}
static inline struct fence *
reservation_object_get_excl(struct reservation_object *obj)
{
reservation_object_assert_held(obj);
return obj->fence_excl;
}
int reservation_object_reserve_shared(struct reservation_object *obj);
void reservation_object_add_shared_fence(struct reservation_object *obj,
struct fence *fence);
void reservation_object_add_excl_fence(struct reservation_object *obj,
struct fence *fence);
#endif /* _LINUX_RESERVATION_H */
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