kernel-ark/drivers/char/drm/drm_hashtab.h
Thomas Hellstrom 8d153f7107 drm: update user token hashing and map handles
Keep hashed user tokens, with the following changes:
32-bit physical device addresses are mapped directly to user-tokens. No
    duplicate maps are allowed, and the addresses are assumed to be outside
    of the range 0x10000000 through 0x30000000. The user-token is identical
    to the 32-bit physical start-address of the map.
64-bit physical device addressed are mapped to user-tokens in the range
0x10000000 to 0x30000000 with page-size increments. The user_token should
    not be interpreted as an address.
Other map types, like upcoming TTM maps are mapped to user-tokens in the
    range
0x10000000 to 0x30000000 with page-size increments. The user_token should
    not be interpreted as an address.

Implement hashed map lookups.

Signed-off-by: Dave Airlie <airlied@linux.ie>
2006-09-22 05:32:31 +10:00

68 lines
2.5 KiB
C

/**************************************************************************
*
* 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
#define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
typedef struct drm_hash_item{
struct hlist_node head;
unsigned long key;
} drm_hash_item_t;
typedef struct drm_open_hash{
unsigned int size;
unsigned int order;
unsigned int fill;
struct hlist_head *table;
} drm_open_hash_t;
extern int drm_ht_create(drm_open_hash_t *ht, unsigned int order);
extern int drm_ht_insert_item(drm_open_hash_t *ht, drm_hash_item_t *item);
extern int drm_ht_just_insert_please(drm_open_hash_t *ht, drm_hash_item_t *item,
unsigned long seed, int bits, int shift,
unsigned long add);
extern int drm_ht_find_item(drm_open_hash_t *ht, unsigned long key, drm_hash_item_t **item);
extern void drm_ht_verbose_list(drm_open_hash_t *ht, unsigned long key);
extern int drm_ht_remove_key(drm_open_hash_t *ht, unsigned long key);
extern int drm_ht_remove_item(drm_open_hash_t *ht, drm_hash_item_t *item);
extern void drm_ht_remove(drm_open_hash_t *ht);
#endif