mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
0500c04ea1
The use of the drmP.h header file is deprecated. Remove use from all files in drm/* so people do not look there and follow a bad example. Build tested allyesconfig,allmodconfig on x86, arm etc. Including alpha that is as always more challenging than the rest. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Daniel Vetter <daniel@ffwll.ch> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <maxime.ripard@bootlin.com> Cc: Sean Paul <sean@poorly.run> Cc: David Airlie <airlied@linux.ie> Link: https://patchwork.freedesktop.org/patch/msgid/20190526173535.32701-8-sam@ravnborg.org
210 lines
5.5 KiB
C
210 lines
5.5 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, 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>
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/hash.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/rculist.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <drm/drm_hashtab.h>
|
|
#include <drm/drm_print.h>
|
|
|
|
int drm_ht_create(struct drm_open_hash *ht, unsigned int order)
|
|
{
|
|
unsigned int size = 1 << order;
|
|
|
|
ht->order = order;
|
|
ht->table = NULL;
|
|
if (size <= PAGE_SIZE / sizeof(*ht->table))
|
|
ht->table = kcalloc(size, sizeof(*ht->table), GFP_KERNEL);
|
|
else
|
|
ht->table = vzalloc(array_size(size, sizeof(*ht->table)));
|
|
if (!ht->table) {
|
|
DRM_ERROR("Out of memory for hash table\n");
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_ht_create);
|
|
|
|
void drm_ht_verbose_list(struct drm_open_hash *ht, unsigned long key)
|
|
{
|
|
struct drm_hash_item *entry;
|
|
struct hlist_head *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];
|
|
hlist_for_each_entry(entry, h_list, head)
|
|
DRM_DEBUG("count %d, key: 0x%08lx\n", count++, entry->key);
|
|
}
|
|
|
|
static struct hlist_node *drm_ht_find_key(struct drm_open_hash *ht,
|
|
unsigned long key)
|
|
{
|
|
struct drm_hash_item *entry;
|
|
struct hlist_head *h_list;
|
|
unsigned int hashed_key;
|
|
|
|
hashed_key = hash_long(key, ht->order);
|
|
h_list = &ht->table[hashed_key];
|
|
hlist_for_each_entry(entry, h_list, head) {
|
|
if (entry->key == key)
|
|
return &entry->head;
|
|
if (entry->key > key)
|
|
break;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct hlist_node *drm_ht_find_key_rcu(struct drm_open_hash *ht,
|
|
unsigned long key)
|
|
{
|
|
struct drm_hash_item *entry;
|
|
struct hlist_head *h_list;
|
|
unsigned int hashed_key;
|
|
|
|
hashed_key = hash_long(key, ht->order);
|
|
h_list = &ht->table[hashed_key];
|
|
hlist_for_each_entry_rcu(entry, h_list, head) {
|
|
if (entry->key == key)
|
|
return &entry->head;
|
|
if (entry->key > key)
|
|
break;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int drm_ht_insert_item(struct drm_open_hash *ht, struct drm_hash_item *item)
|
|
{
|
|
struct drm_hash_item *entry;
|
|
struct hlist_head *h_list;
|
|
struct hlist_node *parent;
|
|
unsigned int hashed_key;
|
|
unsigned long key = item->key;
|
|
|
|
hashed_key = hash_long(key, ht->order);
|
|
h_list = &ht->table[hashed_key];
|
|
parent = NULL;
|
|
hlist_for_each_entry(entry, h_list, head) {
|
|
if (entry->key == key)
|
|
return -EINVAL;
|
|
if (entry->key > key)
|
|
break;
|
|
parent = &entry->head;
|
|
}
|
|
if (parent) {
|
|
hlist_add_behind_rcu(&item->head, parent);
|
|
} else {
|
|
hlist_add_head_rcu(&item->head, h_list);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_ht_insert_item);
|
|
|
|
/*
|
|
* Just insert an item and return any "bits" bit key that hasn't been
|
|
* used before.
|
|
*/
|
|
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)
|
|
{
|
|
int ret;
|
|
unsigned long mask = (1UL << bits) - 1;
|
|
unsigned long first, unshifted_key;
|
|
|
|
unshifted_key = hash_long(seed, bits);
|
|
first = unshifted_key;
|
|
do {
|
|
item->key = (unshifted_key << shift) + add;
|
|
ret = drm_ht_insert_item(ht, item);
|
|
if (ret)
|
|
unshifted_key = (unshifted_key + 1) & mask;
|
|
} while(ret && (unshifted_key != first));
|
|
|
|
if (ret) {
|
|
DRM_ERROR("Available key bit space exhausted\n");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_ht_just_insert_please);
|
|
|
|
int drm_ht_find_item(struct drm_open_hash *ht, unsigned long key,
|
|
struct drm_hash_item **item)
|
|
{
|
|
struct hlist_node *list;
|
|
|
|
list = drm_ht_find_key_rcu(ht, key);
|
|
if (!list)
|
|
return -EINVAL;
|
|
|
|
*item = hlist_entry(list, struct drm_hash_item, head);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_ht_find_item);
|
|
|
|
int drm_ht_remove_key(struct drm_open_hash *ht, unsigned long key)
|
|
{
|
|
struct hlist_node *list;
|
|
|
|
list = drm_ht_find_key(ht, key);
|
|
if (list) {
|
|
hlist_del_init_rcu(list);
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
int drm_ht_remove_item(struct drm_open_hash *ht, struct drm_hash_item *item)
|
|
{
|
|
hlist_del_init_rcu(&item->head);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_ht_remove_item);
|
|
|
|
void drm_ht_remove(struct drm_open_hash *ht)
|
|
{
|
|
if (ht->table) {
|
|
kvfree(ht->table);
|
|
ht->table = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(drm_ht_remove);
|