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- /**************************************************************************
- *
- * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. 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.
- *
- *
- **************************************************************************/
- /*
- * Simple open hash tab implementation.
- *
- * Authors:
- * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
- */
- #ifndef DRM_HASHTAB_H
- #define DRM_HASHTAB_H
- #include <linux/list.h>
- #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
- struct drm_hash_item {
- struct hlist_node head;
- unsigned long key;
- };
- struct drm_open_hash {
- struct hlist_head *table;
- u8 order;
- };
- extern int drm_ht_create(struct drm_open_hash *ht, unsigned int order);
- extern int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item);
- extern int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item,
- unsigned long seed, int bits, int shift,
- unsigned long add);
- extern int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item);
- extern void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key);
- extern int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key);
- extern int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item);
- extern void drm_ht_remove(struct drm_open_hash *ht);
- /*
- * RCU-safe interface
- *
- * The user of this API needs to make sure that two or more instances of the
- * hash table manipulation functions are never run simultaneously.
- * The lookup function drm_ht_find_item_rcu may, however, run simultaneously
- * with any of the manipulation functions as long as it's called from within
- * an RCU read-locked section.
- */
- #define drm_ht_insert_item_rcu drm_ht_insert_item
- #define drm_ht_just_insert_please_rcu drm_ht_just_insert_please
- #define drm_ht_remove_key_rcu drm_ht_remove_key
- #define drm_ht_remove_item_rcu drm_ht_remove_item
- #define drm_ht_find_item_rcu drm_ht_find_item
- #endif
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