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-rw-r--r--drivers/acpi/utilities/utcache.c314
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diff --git a/drivers/acpi/utilities/utcache.c b/drivers/acpi/utilities/utcache.c
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index 245fa80cf60..00000000000
--- a/drivers/acpi/utilities/utcache.c
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1/******************************************************************************
2 *
3 * Module Name: utcache - local cache allocation routines
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2008, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44#include <acpi/acpi.h>
45
46#define _COMPONENT ACPI_UTILITIES
47ACPI_MODULE_NAME("utcache")
48#ifdef ACPI_USE_LOCAL_CACHE
49/*******************************************************************************
50 *
51 * FUNCTION: acpi_os_create_cache
52 *
53 * PARAMETERS: cache_name - Ascii name for the cache
54 * object_size - Size of each cached object
55 * max_depth - Maximum depth of the cache (in objects)
56 * return_cache - Where the new cache object is returned
57 *
58 * RETURN: Status
59 *
60 * DESCRIPTION: Create a cache object
61 *
62 ******************************************************************************/
63acpi_status
64acpi_os_create_cache(char *cache_name,
65 u16 object_size,
66 u16 max_depth, struct acpi_memory_list ** return_cache)
67{
68 struct acpi_memory_list *cache;
69
70 ACPI_FUNCTION_ENTRY();
71
72 if (!cache_name || !return_cache || (object_size < 16)) {
73 return (AE_BAD_PARAMETER);
74 }
75
76 /* Create the cache object */
77
78 cache = acpi_os_allocate(sizeof(struct acpi_memory_list));
79 if (!cache) {
80 return (AE_NO_MEMORY);
81 }
82
83 /* Populate the cache object and return it */
84
85 ACPI_MEMSET(cache, 0, sizeof(struct acpi_memory_list));
86 cache->link_offset = 8;
87 cache->list_name = cache_name;
88 cache->object_size = object_size;
89 cache->max_depth = max_depth;
90
91 *return_cache = cache;
92 return (AE_OK);
93}
94
95/*******************************************************************************
96 *
97 * FUNCTION: acpi_os_purge_cache
98 *
99 * PARAMETERS: Cache - Handle to cache object
100 *
101 * RETURN: Status
102 *
103 * DESCRIPTION: Free all objects within the requested cache.
104 *
105 ******************************************************************************/
106
107acpi_status acpi_os_purge_cache(struct acpi_memory_list * cache)
108{
109 char *next;
110
111 ACPI_FUNCTION_ENTRY();
112
113 if (!cache) {
114 return (AE_BAD_PARAMETER);
115 }
116
117 /* Walk the list of objects in this cache */
118
119 while (cache->list_head) {
120
121 /* Delete and unlink one cached state object */
122
123 next = *(ACPI_CAST_INDIRECT_PTR(char,
124 &(((char *)cache->
125 list_head)[cache->
126 link_offset])));
127 ACPI_FREE(cache->list_head);
128
129 cache->list_head = next;
130 cache->current_depth--;
131 }
132
133 return (AE_OK);
134}
135
136/*******************************************************************************
137 *
138 * FUNCTION: acpi_os_delete_cache
139 *
140 * PARAMETERS: Cache - Handle to cache object
141 *
142 * RETURN: Status
143 *
144 * DESCRIPTION: Free all objects within the requested cache and delete the
145 * cache object.
146 *
147 ******************************************************************************/
148
149acpi_status acpi_os_delete_cache(struct acpi_memory_list * cache)
150{
151 acpi_status status;
152
153 ACPI_FUNCTION_ENTRY();
154
155 /* Purge all objects in the cache */
156
157 status = acpi_os_purge_cache(cache);
158 if (ACPI_FAILURE(status)) {
159 return (status);
160 }
161
162 /* Now we can delete the cache object */
163
164 ACPI_FREE(cache);
165 return (AE_OK);
166}
167
168/*******************************************************************************
169 *
170 * FUNCTION: acpi_os_release_object
171 *
172 * PARAMETERS: Cache - Handle to cache object
173 * Object - The object to be released
174 *
175 * RETURN: None
176 *
177 * DESCRIPTION: Release an object to the specified cache. If cache is full,
178 * the object is deleted.
179 *
180 ******************************************************************************/
181
182acpi_status
183acpi_os_release_object(struct acpi_memory_list * cache, void *object)
184{
185 acpi_status status;
186
187 ACPI_FUNCTION_ENTRY();
188
189 if (!cache || !object) {
190 return (AE_BAD_PARAMETER);
191 }
192
193 /* If cache is full, just free this object */
194
195 if (cache->current_depth >= cache->max_depth) {
196 ACPI_FREE(object);
197 ACPI_MEM_TRACKING(cache->total_freed++);
198 }
199
200 /* Otherwise put this object back into the cache */
201
202 else {
203 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
204 if (ACPI_FAILURE(status)) {
205 return (status);
206 }
207
208 /* Mark the object as cached */
209
210 ACPI_MEMSET(object, 0xCA, cache->object_size);
211 ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_CACHED);
212
213 /* Put the object at the head of the cache list */
214
215 *(ACPI_CAST_INDIRECT_PTR(char,
216 &(((char *)object)[cache->
217 link_offset]))) =
218 cache->list_head;
219 cache->list_head = object;
220 cache->current_depth++;
221
222 (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
223 }
224
225 return (AE_OK);
226}
227
228/*******************************************************************************
229 *
230 * FUNCTION: acpi_os_acquire_object
231 *
232 * PARAMETERS: Cache - Handle to cache object
233 *
234 * RETURN: the acquired object. NULL on error
235 *
236 * DESCRIPTION: Get an object from the specified cache. If cache is empty,
237 * the object is allocated.
238 *
239 ******************************************************************************/
240
241void *acpi_os_acquire_object(struct acpi_memory_list *cache)
242{
243 acpi_status status;
244 void *object;
245
246 ACPI_FUNCTION_NAME(os_acquire_object);
247
248 if (!cache) {
249 return (NULL);
250 }
251
252 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
253 if (ACPI_FAILURE(status)) {
254 return (NULL);
255 }
256
257 ACPI_MEM_TRACKING(cache->requests++);
258
259 /* Check the cache first */
260
261 if (cache->list_head) {
262
263 /* There is an object available, use it */
264
265 object = cache->list_head;
266 cache->list_head = *(ACPI_CAST_INDIRECT_PTR(char,
267 &(((char *)
268 object)[cache->
269 link_offset])));
270
271 cache->current_depth--;
272
273 ACPI_MEM_TRACKING(cache->hits++);
274 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
275 "Object %p from %s cache\n", object,
276 cache->list_name));
277
278 status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
279 if (ACPI_FAILURE(status)) {
280 return (NULL);
281 }
282
283 /* Clear (zero) the previously used Object */
284
285 ACPI_MEMSET(object, 0, cache->object_size);
286 } else {
287 /* The cache is empty, create a new object */
288
289 ACPI_MEM_TRACKING(cache->total_allocated++);
290
291#ifdef ACPI_DBG_TRACK_ALLOCATIONS
292 if ((cache->total_allocated - cache->total_freed) >
293 cache->max_occupied) {
294 cache->max_occupied =
295 cache->total_allocated - cache->total_freed;
296 }
297#endif
298
299 /* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
300
301 status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
302 if (ACPI_FAILURE(status)) {
303 return (NULL);
304 }
305
306 object = ACPI_ALLOCATE_ZEROED(cache->object_size);
307 if (!object) {
308 return (NULL);
309 }
310 }
311
312 return (object);
313}
314#endif /* ACPI_USE_LOCAL_CACHE */
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-24 00:33:49 -0400