cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vmwgfx_hashtab.h (3139B)

      1/*
      2 * Copyright 2006 Tungsten Graphics, Inc., Bismack, ND. USA.
      3 * All Rights Reserved.
      4 *
      5 * Permission is hereby granted, free of charge, to any person obtaining a
      6 * copy of this software and associated documentation files (the
      7 * "Software"), to deal in the Software without restriction, including
      8 * without limitation the rights to use, copy, modify, merge, publish,
      9 * distribute, sub license, and/or sell copies of the Software, and to
     10 * permit persons to whom the Software is furnished to do so, subject to
     11 * the following conditions:
     12 *
     13 * The above copyright notice and this permission notice (including the
     14 * next paragraph) shall be included in all copies or substantial portions
     15 * of the Software.
     16 *
     17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     20 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     23 * USE OR OTHER DEALINGS IN THE SOFTWARE.
     24 */
     25
     26/*
     27 * Simple open hash tab implementation.
     28 *
     29 * Authors:
     30 * Thomas Hellström <thomas-at-tungstengraphics-dot-com>
     31 */
     32
     33/*
     34 * TODO: Replace this hashtable with Linux' generic implementation
     35 *       from <linux/hashtable.h>.
     36 */
     37
     38#ifndef VMWGFX_HASHTAB_H
     39#define VMWGFX_HASHTAB_H
     40
     41#include <linux/list.h>
     42
     43#define drm_hash_entry(_ptr, _type, _member) container_of(_ptr, _type, _member)
     44
     45struct vmwgfx_hash_item {
     46	struct hlist_node head;
     47	unsigned long key;
     48};
     49
     50struct vmwgfx_open_hash {
     51	struct hlist_head *table;
     52	u8 order;
     53};
     54
     55int vmwgfx_ht_create(struct vmwgfx_open_hash *ht, unsigned int order);
     56int vmwgfx_ht_insert_item(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item);
     57int vmwgfx_ht_just_insert_please(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item,
     58				 unsigned long seed, int bits, int shift,
     59				 unsigned long add);
     60int vmwgfx_ht_find_item(struct vmwgfx_open_hash *ht, unsigned long key,
     61			struct vmwgfx_hash_item **item);
     62
     63void vmwgfx_ht_verbose_list(struct vmwgfx_open_hash *ht, unsigned long key);
     64int vmwgfx_ht_remove_key(struct vmwgfx_open_hash *ht, unsigned long key);
     65int vmwgfx_ht_remove_item(struct vmwgfx_open_hash *ht, struct vmwgfx_hash_item *item);
     66void vmwgfx_ht_remove(struct vmwgfx_open_hash *ht);
     67
     68/*
     69 * RCU-safe interface
     70 *
     71 * The user of this API needs to make sure that two or more instances of the
     72 * hash table manipulation functions are never run simultaneously.
     73 * The lookup function vmwgfx_ht_find_item_rcu may, however, run simultaneously
     74 * with any of the manipulation functions as long as it's called from within
     75 * an RCU read-locked section.
     76 */
     77#define vmwgfx_ht_insert_item_rcu vmwgfx_ht_insert_item
     78#define vmwgfx_ht_just_insert_please_rcu vmwgfx_ht_just_insert_please
     79#define vmwgfx_ht_remove_key_rcu vmwgfx_ht_remove_key
     80#define vmwgfx_ht_remove_item_rcu vmwgfx_ht_remove_item
     81#define vmwgfx_ht_find_item_rcu vmwgfx_ht_find_item
     82
     83#endif