xref: /freebsd-11-stable/sys/dev/drm/drm_hashtab.h

/**************************************************************************
 *
 * 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.
 *
 *
 **************************************************************************/

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * Simple open hash tab implementation.
 *
 * Authors:
 * Thomas Hellstr��m <thomas-at-tungstengraphics-dot-com>
 */

#ifndef DRM_HASHTAB_H
#define DRM_HASHTAB_H

#define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)

struct drm_hash_item {
	LIST_ENTRY(drm_hash_item) head;
	unsigned long key;
};

struct drm_open_hash {
	LIST_HEAD(drm_hash_item_list, drm_hash_item) *table;
	unsigned int  size;
	unsigned int order;
	unsigned long mask;
};

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);

#endif