/**************************************************************************
   *
   * 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