1 /**************************************************************************
3 * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA.
6 * Permission is hereby granted, free of charge, to any person obtaining a
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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27 **************************************************************************/
29 * Simple open hash tab implementation.
32 * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
38 #include <linux/list.h>
40 #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
42 struct drm_hash_item {
43 struct hlist_node head;
47 struct drm_open_hash {
48 struct hlist_head *table;
52 int drm_ht_create(struct drm_open_hash *ht, unsigned int order);
53 int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item);
54 int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item,
55 unsigned long seed, int bits, int shift,
57 int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item);
59 void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key);
60 int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key);
61 int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item);
62 void drm_ht_remove(struct drm_open_hash *ht);
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.
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