2 * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
20 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
23 * USE OR OTHER DEALINGS IN THE SOFTWARE.
27 * Simple open hash tab implementation.
30 * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
34 * TODO: Replace this hashtable with Linux' generic implementation
35 * from <linux/hashtable.h>.
38 #ifndef VMWGFX_HASHTAB_H
39 #define VMWGFX_HASHTAB_H
41 #include <linux/list.h>
43 #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
45 struct vmwgfx_hash_item {
46 struct hlist_node head;
50 struct vmwgfx_open_hash {
51 struct hlist_head *table;
55 int vmwgfx_ht_create(struct vmwgfx_open_hash *ht, unsigned int order);
56 int vmwgfx_ht_insert_item(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item);
57 int vmwgfx_ht_just_insert_please(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item,
58 unsigned long seed, int bits, int shift,
60 int vmwgfx_ht_find_item(struct vmwgfx_open_hash *ht, unsigned long key,
61 struct vmwgfx_hash_item **item);
63 void vmwgfx_ht_verbose_list(struct vmwgfx_open_hash *ht, unsigned long key);
64 int vmwgfx_ht_remove_key(struct vmwgfx_open_hash *ht, unsigned long key);
65 int vmwgfx_ht_remove_item(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item);
66 void vmwgfx_ht_remove(struct vmwgfx_open_hash *ht);
71 * The user of this API needs to make sure that two or more instances of the
72 * hash table manipulation functions are never run simultaneously.
73 * The lookup function vmwgfx_ht_find_item_rcu may, however, run simultaneously
74 * with any of the manipulation functions as long as it's called from within
75 * an RCU read-locked section.
77 #define vmwgfx_ht_insert_item_rcu vmwgfx_ht_insert_item
78 #define vmwgfx_ht_just_insert_please_rcu vmwgfx_ht_just_insert_please
79 #define vmwgfx_ht_remove_key_rcu vmwgfx_ht_remove_key
80 #define vmwgfx_ht_remove_item_rcu vmwgfx_ht_remove_item
81 #define vmwgfx_ht_find_item_rcu vmwgfx_ht_find_item