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/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Steamboat Springs, CO. 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>
*/
#include "drmP.h"
#include "drm_hashtab.h"
#include <linux/hash.h>
int
drm_ht_create(drm_open_hash_t *ht, unsigned int order)
{
unsigned int i;
ht->size = 1 << order;
ht->order = order;
ht->fill = 0;
ht->table = vmalloc(ht->size*sizeof(*ht->table));
if (!ht->table) {
DRM_ERROR("Out of memory for hash table\n");
return -ENOMEM;
}
for (i=0; i< ht->size; ++i) {
INIT_LIST_HEAD(&ht->table[i]);
}
return 0;
}
void
drm_ht_verbose_list(drm_open_hash_t *ht, unsigned long key)
{
drm_hash_item_t *entry;
struct list_head *list, *h_list;
unsigned int hashed_key;
int count = 0;
hashed_key = hash_long(key, ht->order);
DRM_DEBUG("Key is 0x%08lx, Hashed key is 0x%08x\n", key, hashed_key);
h_list = &ht->table[hashed_key];
list_for_each(list, h_list) {
entry = list_entry(list, drm_hash_item_t, head);
DRM_DEBUG("count %d, key: 0x%08lx\n", count++, entry->key);
}
}
static struct list_head
*drm_ht_find_key(drm_open_hash_t *ht, unsigned long key, int *found)
{
drm_hash_item_t *entry;
struct list_head *list, *h_list, *ret;
unsigned int hashed_key;
hashed_key = hash_long(key, ht->order);
*found = FALSE;
h_list = &ht->table[hashed_key];
ret = h_list;
list_for_each(list, h_list) {
entry = list_entry(list, drm_hash_item_t, head);
if (entry->key == key) {
ret = list;
*found = TRUE;
break;
}
if (entry->key > key) {
ret = list;
break;
}
}
return ret;
}
int
drm_ht_insert_item(drm_open_hash_t *ht, drm_hash_item_t *item)
{
int found;
struct list_head *list;
list = drm_ht_find_key(ht, item->key, &found);
if (found) {
return -EINVAL;
} else {
list_add_tail(&item->head, list);
ht->fill++;
}
return 0;
}
/*
* Just insert an item and return any "bits" bit key that hasn't been used before.
*/
int
drm_ht_just_insert_please(drm_open_hash_t *ht, drm_hash_item_t *item,
unsigned long seed, int bits)
{
int ret;
unsigned long mask = (1 << bits) - 1;
unsigned long first;
item->key = hash_long(seed, bits);
first = item->key;
do{
ret = drm_ht_insert_item(ht, item);
if (ret)
item->key = (item->key + 1) & mask;
} while(ret && (item->key != first));
if (ret) {
DRM_ERROR("Available key bit space exhausted\n");
return -EINVAL;
}
return 0;
}
int
drm_ht_find_item(drm_open_hash_t *ht, unsigned long key, drm_hash_item_t **item)
{
int found;
struct list_head *list;
list = drm_ht_find_key(ht, key, &found);
if (!found) {
return -1;
} else {
*item = list_entry(list, drm_hash_item_t, head);
return 0;
}
}
int
drm_ht_remove_key(drm_open_hash_t *ht, unsigned long key)
{
int found;
struct list_head *list;
list = drm_ht_find_key(ht, key, &found);
if (found) {
list_del_init(list);
ht->fill--;
return 0;
}
return -1;
}
int
drm_ht_remove_item(drm_open_hash_t *ht, drm_hash_item_t *item)
{
list_del_init(&item->head);
ht->fill--;
return 0;
}
void drm_ht_remove(drm_open_hash_t *ht)
{
if (ht->table) {
vfree(ht->table);
ht->table = NULL;
}
}
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