PRCM: 34XX: Fix wrong shift value used in dpll4_m4x2_ck enable bit
[linux-ginger.git] / drivers / acpi / utilities / utcache.c
blob245fa80cf60004da09db0195fc02ac748d9412a7
1 /******************************************************************************
3 * Module Name: utcache - local cache allocation routines
5 *****************************************************************************/
7 /*
8 * Copyright (C) 2000 - 2008, Intel Corp.
9 * All rights reserved.
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16 * without modification.
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23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
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28 * Software Foundation.
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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44 #include <acpi/acpi.h>
46 #define _COMPONENT ACPI_UTILITIES
47 ACPI_MODULE_NAME("utcache")
48 #ifdef ACPI_USE_LOCAL_CACHE
49 /*******************************************************************************
51 * FUNCTION: acpi_os_create_cache
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
58 * RETURN: Status
60 * DESCRIPTION: Create a cache object
62 ******************************************************************************/
63 acpi_status
64 acpi_os_create_cache(char *cache_name,
65 u16 object_size,
66 u16 max_depth, struct acpi_memory_list ** return_cache)
68 struct acpi_memory_list *cache;
70 ACPI_FUNCTION_ENTRY();
72 if (!cache_name || !return_cache || (object_size < 16)) {
73 return (AE_BAD_PARAMETER);
76 /* Create the cache object */
78 cache = acpi_os_allocate(sizeof(struct acpi_memory_list));
79 if (!cache) {
80 return (AE_NO_MEMORY);
83 /* Populate the cache object and return it */
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;
91 *return_cache = cache;
92 return (AE_OK);
95 /*******************************************************************************
97 * FUNCTION: acpi_os_purge_cache
99 * PARAMETERS: Cache - Handle to cache object
101 * RETURN: Status
103 * DESCRIPTION: Free all objects within the requested cache.
105 ******************************************************************************/
107 acpi_status acpi_os_purge_cache(struct acpi_memory_list * cache)
109 char *next;
111 ACPI_FUNCTION_ENTRY();
113 if (!cache) {
114 return (AE_BAD_PARAMETER);
117 /* Walk the list of objects in this cache */
119 while (cache->list_head) {
121 /* Delete and unlink one cached state object */
123 next = *(ACPI_CAST_INDIRECT_PTR(char,
124 &(((char *)cache->
125 list_head)[cache->
126 link_offset])));
127 ACPI_FREE(cache->list_head);
129 cache->list_head = next;
130 cache->current_depth--;
133 return (AE_OK);
136 /*******************************************************************************
138 * FUNCTION: acpi_os_delete_cache
140 * PARAMETERS: Cache - Handle to cache object
142 * RETURN: Status
144 * DESCRIPTION: Free all objects within the requested cache and delete the
145 * cache object.
147 ******************************************************************************/
149 acpi_status acpi_os_delete_cache(struct acpi_memory_list * cache)
151 acpi_status status;
153 ACPI_FUNCTION_ENTRY();
155 /* Purge all objects in the cache */
157 status = acpi_os_purge_cache(cache);
158 if (ACPI_FAILURE(status)) {
159 return (status);
162 /* Now we can delete the cache object */
164 ACPI_FREE(cache);
165 return (AE_OK);
168 /*******************************************************************************
170 * FUNCTION: acpi_os_release_object
172 * PARAMETERS: Cache - Handle to cache object
173 * Object - The object to be released
175 * RETURN: None
177 * DESCRIPTION: Release an object to the specified cache. If cache is full,
178 * the object is deleted.
180 ******************************************************************************/
182 acpi_status
183 acpi_os_release_object(struct acpi_memory_list * cache, void *object)
185 acpi_status status;
187 ACPI_FUNCTION_ENTRY();
189 if (!cache || !object) {
190 return (AE_BAD_PARAMETER);
193 /* If cache is full, just free this object */
195 if (cache->current_depth >= cache->max_depth) {
196 ACPI_FREE(object);
197 ACPI_MEM_TRACKING(cache->total_freed++);
200 /* Otherwise put this object back into the cache */
202 else {
203 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
204 if (ACPI_FAILURE(status)) {
205 return (status);
208 /* Mark the object as cached */
210 ACPI_MEMSET(object, 0xCA, cache->object_size);
211 ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_CACHED);
213 /* Put the object at the head of the cache list */
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++;
222 (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
225 return (AE_OK);
228 /*******************************************************************************
230 * FUNCTION: acpi_os_acquire_object
232 * PARAMETERS: Cache - Handle to cache object
234 * RETURN: the acquired object. NULL on error
236 * DESCRIPTION: Get an object from the specified cache. If cache is empty,
237 * the object is allocated.
239 ******************************************************************************/
241 void *acpi_os_acquire_object(struct acpi_memory_list *cache)
243 acpi_status status;
244 void *object;
246 ACPI_FUNCTION_NAME(os_acquire_object);
248 if (!cache) {
249 return (NULL);
252 status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
253 if (ACPI_FAILURE(status)) {
254 return (NULL);
257 ACPI_MEM_TRACKING(cache->requests++);
259 /* Check the cache first */
261 if (cache->list_head) {
263 /* There is an object available, use it */
265 object = cache->list_head;
266 cache->list_head = *(ACPI_CAST_INDIRECT_PTR(char,
267 &(((char *)
268 object)[cache->
269 link_offset])));
271 cache->current_depth--;
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));
278 status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
279 if (ACPI_FAILURE(status)) {
280 return (NULL);
283 /* Clear (zero) the previously used Object */
285 ACPI_MEMSET(object, 0, cache->object_size);
286 } else {
287 /* The cache is empty, create a new object */
289 ACPI_MEM_TRACKING(cache->total_allocated++);
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;
297 #endif
299 /* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
301 status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
302 if (ACPI_FAILURE(status)) {
303 return (NULL);
306 object = ACPI_ALLOCATE_ZEROED(cache->object_size);
307 if (!object) {
308 return (NULL);
312 return (object);
314 #endif /* ACPI_USE_LOCAL_CACHE */