1 /******************************************************************************
2 *
3 * Module Name: utcache - local cache allocation routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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 #define __UTCACHE_C__
45
46 #include "acpi.h"
47 #include "accommon.h"
48
49 #define _COMPONENT ACPI_UTILITIES
50 ACPI_MODULE_NAME ("utcache")
51
52
53 #ifdef ACPI_USE_LOCAL_CACHE
54 /*******************************************************************************
55 *
56 * FUNCTION: AcpiOsCreateCache
57 *
58 * PARAMETERS: CacheName - Ascii name for the cache
59 * ObjectSize - Size of each cached object
60 * MaxDepth - Maximum depth of the cache (in objects)
61 * ReturnCache - Where the new cache object is returned
62 *
63 * RETURN: Status
64 *
65 * DESCRIPTION: Create a cache object
66 *
67 ******************************************************************************/
68
69 ACPI_STATUS
70 AcpiOsCreateCache (
71 char *CacheName,
72 UINT16 ObjectSize,
73 UINT16 MaxDepth,
74 ACPI_MEMORY_LIST **ReturnCache)
75 {
76 ACPI_MEMORY_LIST *Cache;
77
78
79 ACPI_FUNCTION_ENTRY ();
80
81
82 if (!CacheName || !ReturnCache || (ObjectSize < 16))
83 {
84 return (AE_BAD_PARAMETER);
85 }
86
87 /* Create the cache object */
88
89 Cache = AcpiOsAllocate (sizeof (ACPI_MEMORY_LIST));
90 if (!Cache)
91 {
92 return (AE_NO_MEMORY);
93 }
94
95 /* Populate the cache object and return it */
96
97 ACPI_MEMSET (Cache, 0, sizeof (ACPI_MEMORY_LIST));
98 Cache->ListName = CacheName;
99 Cache->ObjectSize = ObjectSize;
100 Cache->MaxDepth = MaxDepth;
101
102 *ReturnCache = Cache;
103 return (AE_OK);
104 }
105
106
107 /*******************************************************************************
108 *
109 * FUNCTION: AcpiOsPurgeCache
110 *
111 * PARAMETERS: Cache - Handle to cache object
112 *
113 * RETURN: Status
114 *
115 * DESCRIPTION: Free all objects within the requested cache.
116 *
117 ******************************************************************************/
118
119 ACPI_STATUS
120 AcpiOsPurgeCache (
121 ACPI_MEMORY_LIST *Cache)
122 {
123 void *Next;
124 ACPI_STATUS Status;
125
126
127 ACPI_FUNCTION_ENTRY ();
128
129
130 if (!Cache)
131 {
132 return (AE_BAD_PARAMETER);
133 }
134
135 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
136 if (ACPI_FAILURE (Status))
137 {
138 return (Status);
139 }
140
141 /* Walk the list of objects in this cache */
142
143 while (Cache->ListHead)
144 {
145 /* Delete and unlink one cached state object */
146
147 Next = ACPI_GET_DESCRIPTOR_PTR (Cache->ListHead);
148 ACPI_FREE (Cache->ListHead);
149
150 Cache->ListHead = Next;
151 Cache->CurrentDepth--;
152 }
153
154 (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
155 return (AE_OK);
156 }
157
158
159 /*******************************************************************************
160 *
161 * FUNCTION: AcpiOsDeleteCache
162 *
163 * PARAMETERS: Cache - Handle to cache object
164 *
165 * RETURN: Status
166 *
167 * DESCRIPTION: Free all objects within the requested cache and delete the
168 * cache object.
169 *
170 ******************************************************************************/
171
172 ACPI_STATUS
173 AcpiOsDeleteCache (
174 ACPI_MEMORY_LIST *Cache)
175 {
176 ACPI_STATUS Status;
177
178
179 ACPI_FUNCTION_ENTRY ();
180
181
182 /* Purge all objects in the cache */
183
184 Status = AcpiOsPurgeCache (Cache);
185 if (ACPI_FAILURE (Status))
186 {
187 return (Status);
188 }
189
190 /* Now we can delete the cache object */
191
192 AcpiOsFree (Cache);
193 return (AE_OK);
194 }
195
196
197 /*******************************************************************************
198 *
199 * FUNCTION: AcpiOsReleaseObject
200 *
201 * PARAMETERS: Cache - Handle to cache object
202 * Object - The object to be released
203 *
204 * RETURN: None
205 *
206 * DESCRIPTION: Release an object to the specified cache. If cache is full,
207 * the object is deleted.
208 *
209 ******************************************************************************/
210
211 ACPI_STATUS
212 AcpiOsReleaseObject (
213 ACPI_MEMORY_LIST *Cache,
214 void *Object)
215 {
216 ACPI_STATUS Status;
217
218
219 ACPI_FUNCTION_ENTRY ();
220
221
222 if (!Cache || !Object)
223 {
224 return (AE_BAD_PARAMETER);
225 }
226
227 /* If cache is full, just free this object */
228
229 if (Cache->CurrentDepth >= Cache->MaxDepth)
230 {
231 ACPI_FREE (Object);
232 ACPI_MEM_TRACKING (Cache->TotalFreed++);
233 }
234
235 /* Otherwise put this object back into the cache */
236
237 else
238 {
239 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
240 if (ACPI_FAILURE (Status))
241 {
242 return (Status);
243 }
244
245 /* Mark the object as cached */
246
247 ACPI_MEMSET (Object, 0xCA, Cache->ObjectSize);
248 ACPI_SET_DESCRIPTOR_TYPE (Object, ACPI_DESC_TYPE_CACHED);
249
250 /* Put the object at the head of the cache list */
251
252 ACPI_SET_DESCRIPTOR_PTR (Object, Cache->ListHead);
253 Cache->ListHead = Object;
254 Cache->CurrentDepth++;
255
256 (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
257 }
258
259 return (AE_OK);
260 }
261
262
263 /*******************************************************************************
264 *
265 * FUNCTION: AcpiOsAcquireObject
266 *
267 * PARAMETERS: Cache - Handle to cache object
268 *
269 * RETURN: the acquired object. NULL on error
270 *
271 * DESCRIPTION: Get an object from the specified cache. If cache is empty,
272 * the object is allocated.
273 *
274 ******************************************************************************/
275
276 void *
277 AcpiOsAcquireObject (
278 ACPI_MEMORY_LIST *Cache)
279 {
280 ACPI_STATUS Status;
281 void *Object;
282
283
284 ACPI_FUNCTION_NAME (OsAcquireObject);
285
286
287 if (!Cache)
288 {
289 return_PTR (NULL);
290 }
291
292 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
293 if (ACPI_FAILURE (Status))
294 {
295 return_PTR (NULL);
296 }
297
298 ACPI_MEM_TRACKING (Cache->Requests++);
299
300 /* Check the cache first */
301
302 if (Cache->ListHead)
303 {
304 /* There is an object available, use it */
305
306 Object = Cache->ListHead;
307 Cache->ListHead = ACPI_GET_DESCRIPTOR_PTR (Object);
308
309 Cache->CurrentDepth--;
310
311 ACPI_MEM_TRACKING (Cache->Hits++);
312 ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
313 "Object %p from %s cache\n", Object, Cache->ListName));
314
315 Status = AcpiUtReleaseMutex (ACPI_MTX_CACHES);
316 if (ACPI_FAILURE (Status))
317 {
318 return_PTR (NULL);
319 }
320
321 /* Clear (zero) the previously used Object */
322
323 ACPI_MEMSET (Object, 0, Cache->ObjectSize);
324 }
325 else
326 {
327 /* The cache is empty, create a new object */
328
329 ACPI_MEM_TRACKING (Cache->TotalAllocated++);
330
331 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
332 if ((Cache->TotalAllocated - Cache->TotalFreed) > Cache->MaxOccupied)
333 {
334 Cache->MaxOccupied = Cache->TotalAllocated - Cache->TotalFreed;
335 }
336 #endif
337
338 /* Avoid deadlock with ACPI_ALLOCATE_ZEROED */
339
340 Status = AcpiUtReleaseMutex (ACPI_MTX_CACHES);
341 if (ACPI_FAILURE (Status))
342 {
343 return_PTR (NULL);
344 }
345
346 Object = ACPI_ALLOCATE_ZEROED (Cache->ObjectSize);
347 if (!Object)
348 {
349 return_PTR (NULL);
350 }
351 }
352
353 return_PTR (Object);
354 }
355 #endif /* ACPI_USE_LOCAL_CACHE */