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      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 /*
     30  * Simple open hash tab implementation.
     31  *
     32  * Authors:
     33  * Thomas Hellstrm <thomas-at-tungstengraphics-dot-com>
     34  */
     35 
     36 #ifndef DRM_HASHTAB_H
     37 #define DRM_HASHTAB_H
     38 
     39 #define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
     40 
     41 struct drm_hash_item {
     42 	LIST_ENTRY(drm_hash_item) head;
     43 	unsigned long key;
     44 };
     45 
     46 struct drm_open_hash {
     47 	LIST_HEAD(drm_hash_item_list, drm_hash_item) *table;
     48 	unsigned int  size;
     49 	unsigned int order;
     50 	unsigned long mask;
     51 };
     52 
     53 extern int drm_ht_create(struct drm_open_hash *ht, unsigned int order);
     54 extern int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item);
     55 extern int drm_ht_just_insert_please(struct drm_open_hash *ht, struct drm_hash_item *item,
     56 				     unsigned long seed, int bits, int shift,
     57 				     unsigned long add);
     58 extern int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key, struct drm_hash_item **item);
     59 
     60 extern void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key);
     61 extern int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key);
     62 extern int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item);
     63 extern void drm_ht_remove(struct drm_open_hash *ht);
     64 
     65 #endif
     66