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786d7257 ML |
1 | /* |
2 | * Header file for reservations for dma-buf and ttm | |
3 | * | |
4 | * Copyright(C) 2011 Linaro Limited. All rights reserved. | |
5 | * Copyright (C) 2012-2013 Canonical Ltd | |
6 | * Copyright (C) 2012 Texas Instruments | |
7 | * | |
8 | * Authors: | |
0ba6b8fb | 9 | * Rob Clark <robdclark@gmail.com> |
786d7257 ML |
10 | * Maarten Lankhorst <maarten.lankhorst@canonical.com> |
11 | * Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
12 | * | |
13 | * Based on bo.c which bears the following copyright notice, | |
14 | * but is dual licensed: | |
15 | * | |
16 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
17 | * All Rights Reserved. | |
18 | * | |
19 | * Permission is hereby granted, free of charge, to any person obtaining a | |
20 | * copy of this software and associated documentation files (the | |
21 | * "Software"), to deal in the Software without restriction, including | |
22 | * without limitation the rights to use, copy, modify, merge, publish, | |
23 | * distribute, sub license, and/or sell copies of the Software, and to | |
24 | * permit persons to whom the Software is furnished to do so, subject to | |
25 | * the following conditions: | |
26 | * | |
27 | * The above copyright notice and this permission notice (including the | |
28 | * next paragraph) shall be included in all copies or substantial portions | |
29 | * of the Software. | |
30 | * | |
31 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
32 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
33 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
34 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
35 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
36 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
37 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
38 | */ | |
39 | #ifndef _LINUX_RESERVATION_H | |
40 | #define _LINUX_RESERVATION_H | |
41 | ||
1b375dc3 | 42 | #include <linux/ww_mutex.h> |
0ba6b8fb ML |
43 | #include <linux/fence.h> |
44 | #include <linux/slab.h> | |
786d7257 ML |
45 | |
46 | extern struct ww_class reservation_ww_class; | |
47 | ||
48 | struct reservation_object { | |
49 | struct ww_mutex lock; | |
0ba6b8fb ML |
50 | |
51 | struct fence *fence_excl; | |
52 | struct fence **fence_shared; | |
53 | u32 fence_shared_count, fence_shared_max; | |
786d7257 ML |
54 | }; |
55 | ||
56 | static inline void | |
57 | reservation_object_init(struct reservation_object *obj) | |
58 | { | |
59 | ww_mutex_init(&obj->lock, &reservation_ww_class); | |
0ba6b8fb ML |
60 | |
61 | obj->fence_shared_count = obj->fence_shared_max = 0; | |
62 | obj->fence_shared = NULL; | |
63 | obj->fence_excl = NULL; | |
786d7257 ML |
64 | } |
65 | ||
66 | static inline void | |
67 | reservation_object_fini(struct reservation_object *obj) | |
68 | { | |
0ba6b8fb ML |
69 | int i; |
70 | ||
71 | if (obj->fence_excl) | |
72 | fence_put(obj->fence_excl); | |
73 | for (i = 0; i < obj->fence_shared_count; ++i) | |
74 | fence_put(obj->fence_shared[i]); | |
75 | kfree(obj->fence_shared); | |
76 | ||
786d7257 ML |
77 | ww_mutex_destroy(&obj->lock); |
78 | } | |
79 | ||
80 | #endif /* _LINUX_RESERVATION_H */ |