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3a1bd924 TH |
1 | /************************************************************************** |
2 | * | |
3 | * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA. | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | * | |
27 | **************************************************************************/ | |
28 | /* | |
29 | * Simple open hash tab implementation. | |
30 | * | |
31 | * Authors: | |
96de0e25 | 32 | * Thomas Hellström <thomas-at-tungstengraphics-dot-com> |
3a1bd924 TH |
33 | */ |
34 | ||
35 | #ifndef DRM_HASHTAB_H | |
36 | #define DRM_HASHTAB_H | |
37 | ||
3c24475c JG |
38 | #include <linux/list.h> |
39 | ||
8d153f71 | 40 | #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member) |
3a1bd924 | 41 | |
e0be428e | 42 | struct drm_hash_item { |
3a1bd924 TH |
43 | struct hlist_node head; |
44 | unsigned long key; | |
e0be428e | 45 | }; |
3a1bd924 | 46 | |
e0be428e | 47 | struct drm_open_hash { |
3a1bd924 | 48 | struct hlist_head *table; |
7811bddb | 49 | u8 order; |
e0be428e | 50 | }; |
3a1bd924 | 51 | |
e0be428e DA |
52 | extern int drm_ht_create(struct drm_open_hash *ht, unsigned int order); |
53 | extern int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item); | |
54 | extern int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item, | |
3a1bd924 TH |
55 | unsigned long seed, int bits, int shift, |
56 | unsigned long add); | |
e0be428e | 57 | extern int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item); |
3a1bd924 | 58 | |
e0be428e DA |
59 | extern void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key); |
60 | extern int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key); | |
61 | extern int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item); | |
62 | extern void drm_ht_remove(struct drm_open_hash *ht); | |
3a1bd924 | 63 | |
384cc2f9 TH |
64 | /* |
65 | * RCU-safe interface | |
66 | * | |
67 | * The user of this API needs to make sure that two or more instances of the | |
68 | * hash table manipulation functions are never run simultaneously. | |
69 | * The lookup function drm_ht_find_item_rcu may, however, run simultaneously | |
70 | * with any of the manipulation functions as long as it's called from within | |
71 | * an RCU read-locked section. | |
72 | */ | |
73 | #define drm_ht_insert_item_rcu drm_ht_insert_item | |
74 | #define drm_ht_just_insert_please_rcu drm_ht_just_insert_please | |
75 | #define drm_ht_remove_key_rcu drm_ht_remove_key | |
76 | #define drm_ht_remove_item_rcu drm_ht_remove_item | |
77 | #define drm_ht_find_item_rcu drm_ht_find_item | |
3a1bd924 TH |
78 | |
79 | #endif |