summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/utcache.c
blob: eacc5eee362ebd9e7c5290ff6054ee5009ca633f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/******************************************************************************
 *
 * Module Name: utcache - local cache allocation routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utcache")

#ifdef ACPI_USE_LOCAL_CACHE
/*******************************************************************************
 *
 * FUNCTION:    acpi_os_create_cache
 *
 * PARAMETERS:  cache_name      - Ascii name for the cache
 *              object_size     - Size of each cached object
 *              max_depth       - Maximum depth of the cache (in objects)
 *              return_cache    - Where the new cache object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a cache object
 *
 ******************************************************************************/
acpi_status
acpi_os_create_cache(char *cache_name,
		     u16 object_size,
		     u16 max_depth, struct acpi_memory_list **return_cache)
{
	struct acpi_memory_list *cache;

	ACPI_FUNCTION_ENTRY();

	if (!cache_name || !return_cache || (object_size < 16)) {
		return (AE_BAD_PARAMETER);
	}

	/* Create the cache object */

	cache = acpi_os_allocate(sizeof(struct acpi_memory_list));
	if (!cache) {
		return (AE_NO_MEMORY);
	}

	/* Populate the cache object and return it */

	ACPI_MEMSET(cache, 0, sizeof(struct acpi_memory_list));
	cache->list_name = cache_name;
	cache->object_size = object_size;
	cache->max_depth = max_depth;

	*return_cache = cache;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_purge_cache
 *
 * PARAMETERS:  cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache.
 *
 ******************************************************************************/

acpi_status acpi_os_purge_cache(struct acpi_memory_list * cache)
{
	void *next;
	acpi_status status;

	ACPI_FUNCTION_ENTRY();

	if (!cache) {
		return (AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Walk the list of objects in this cache */

	while (cache->list_head) {

		/* Delete and unlink one cached state object */

		next = ACPI_GET_DESCRIPTOR_PTR(cache->list_head);
		ACPI_FREE(cache->list_head);

		cache->list_head = next;
		cache->current_depth--;
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_delete_cache
 *
 * PARAMETERS:  cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache and delete the
 *              cache object.
 *
 ******************************************************************************/

acpi_status acpi_os_delete_cache(struct acpi_memory_list * cache)
{
	acpi_status status;

	ACPI_FUNCTION_ENTRY();

	/* Purge all objects in the cache */

	status = acpi_os_purge_cache(cache);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Now we can delete the cache object */

	acpi_os_free(cache);
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_release_object
 *
 * PARAMETERS:  cache       - Handle to cache object
 *              object      - The object to be released
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release an object to the specified cache. If cache is full,
 *              the object is deleted.
 *
 ******************************************************************************/

acpi_status
acpi_os_release_object(struct acpi_memory_list * cache, void *object)
{
	acpi_status status;

	ACPI_FUNCTION_ENTRY();

	if (!cache || !object) {
		return (AE_BAD_PARAMETER);
	}

	/* If cache is full, just free this object */

	if (cache->current_depth >= cache->max_depth) {
		ACPI_FREE(object);
		ACPI_MEM_TRACKING(cache->total_freed++);
	}

	/* Otherwise put this object back into the cache */

	else {
		status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		/* Mark the object as cached */

		ACPI_MEMSET(object, 0xCA, cache->object_size);
		ACPI_SET_DESCRIPTOR_TYPE(object, ACPI_DESC_TYPE_CACHED);

		/* Put the object at the head of the cache list */

		ACPI_SET_DESCRIPTOR_PTR(object, cache->list_head);
		cache->list_head = object;
		cache->current_depth++;

		(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_acquire_object
 *
 * PARAMETERS:  cache           - Handle to cache object
 *
 * RETURN:      the acquired object. NULL on error
 *
 * DESCRIPTION: Get an object from the specified cache. If cache is empty,
 *              the object is allocated.
 *
 ******************************************************************************/

void *acpi_os_acquire_object(struct acpi_memory_list *cache)
{
	acpi_status status;
	void *object;

	ACPI_FUNCTION_NAME(os_acquire_object);

	if (!cache) {
		return_PTR(NULL);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
	if (ACPI_FAILURE(status)) {
		return_PTR(NULL);
	}

	ACPI_MEM_TRACKING(cache->requests++);

	/* Check the cache first */

	if (cache->list_head) {

		/* There is an object available, use it */

		object = cache->list_head;
		cache->list_head = ACPI_GET_DESCRIPTOR_PTR(object);

		cache->current_depth--;

		ACPI_MEM_TRACKING(cache->hits++);
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Object %p from %s cache\n", object,
				  cache->list_name));

		status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
		if (ACPI_FAILURE(status)) {
			return_PTR(NULL);
		}

		/* Clear (zero) the previously used Object */

		ACPI_MEMSET(object, 0, cache->object_size);
	} else {
		/* The cache is empty, create a new object */

		ACPI_MEM_TRACKING(cache->total_allocated++);

#ifdef ACPI_DBG_TRACK_ALLOCATIONS
		if ((cache->total_allocated - cache->total_freed) >
		    cache->max_occupied) {
			cache->max_occupied =
			    cache->total_allocated - cache->total_freed;
		}
#endif

		/* Avoid deadlock with ACPI_ALLOCATE_ZEROED */

		status = acpi_ut_release_mutex(ACPI_MTX_CACHES);
		if (ACPI_FAILURE(status)) {
			return_PTR(NULL);
		}

		object = ACPI_ALLOCATE_ZEROED(cache->object_size);
		if (!object) {
			return_PTR(NULL);
		}
	}

	return_PTR(object);
}
#endif				/* ACPI_USE_LOCAL_CACHE */
OpenPOWER on IntegriCloud