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/drivers/acpi/acpica/utalloc.c

http://github.com/mirrors/linux
C | 357 lines | 180 code | 70 blank | 107 comment | 23 complexity | e10aba97ce4c080f04e6cb1669ca8d1a MD5 | raw file
  1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
  2/******************************************************************************
  3 *
  4 * Module Name: utalloc - local memory allocation routines
  5 *
  6 * Copyright (C) 2000 - 2020, Intel Corp.
  7 *
  8 *****************************************************************************/
  9
 10#include <acpi/acpi.h>
 11#include "accommon.h"
 12#include "acdebug.h"
 13
 14#define _COMPONENT          ACPI_UTILITIES
 15ACPI_MODULE_NAME("utalloc")
 16
 17#if !defined (USE_NATIVE_ALLOCATE_ZEROED)
 18/*******************************************************************************
 19 *
 20 * FUNCTION:    acpi_os_allocate_zeroed
 21 *
 22 * PARAMETERS:  size                - Size of the allocation
 23 *
 24 * RETURN:      Address of the allocated memory on success, NULL on failure.
 25 *
 26 * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
 27 *              This is the default implementation. Can be overridden via the
 28 *              USE_NATIVE_ALLOCATE_ZEROED flag.
 29 *
 30 ******************************************************************************/
 31void *acpi_os_allocate_zeroed(acpi_size size)
 32{
 33	void *allocation;
 34
 35	ACPI_FUNCTION_ENTRY();
 36
 37	allocation = acpi_os_allocate(size);
 38	if (allocation) {
 39
 40		/* Clear the memory block */
 41
 42		memset(allocation, 0, size);
 43	}
 44
 45	return (allocation);
 46}
 47
 48#endif				/* !USE_NATIVE_ALLOCATE_ZEROED */
 49
 50/*******************************************************************************
 51 *
 52 * FUNCTION:    acpi_ut_create_caches
 53 *
 54 * PARAMETERS:  None
 55 *
 56 * RETURN:      Status
 57 *
 58 * DESCRIPTION: Create all local caches
 59 *
 60 ******************************************************************************/
 61
 62acpi_status acpi_ut_create_caches(void)
 63{
 64	acpi_status status;
 65
 66	/* Object Caches, for frequently used objects */
 67
 68	status =
 69	    acpi_os_create_cache("Acpi-Namespace",
 70				 sizeof(struct acpi_namespace_node),
 71				 ACPI_MAX_NAMESPACE_CACHE_DEPTH,
 72				 &acpi_gbl_namespace_cache);
 73	if (ACPI_FAILURE(status)) {
 74		return (status);
 75	}
 76
 77	status =
 78	    acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state),
 79				 ACPI_MAX_STATE_CACHE_DEPTH,
 80				 &acpi_gbl_state_cache);
 81	if (ACPI_FAILURE(status)) {
 82		return (status);
 83	}
 84
 85	status =
 86	    acpi_os_create_cache("Acpi-Parse",
 87				 sizeof(struct acpi_parse_obj_common),
 88				 ACPI_MAX_PARSE_CACHE_DEPTH,
 89				 &acpi_gbl_ps_node_cache);
 90	if (ACPI_FAILURE(status)) {
 91		return (status);
 92	}
 93
 94	status =
 95	    acpi_os_create_cache("Acpi-ParseExt",
 96				 sizeof(struct acpi_parse_obj_named),
 97				 ACPI_MAX_EXTPARSE_CACHE_DEPTH,
 98				 &acpi_gbl_ps_node_ext_cache);
 99	if (ACPI_FAILURE(status)) {
100		return (status);
101	}
102
103	status =
104	    acpi_os_create_cache("Acpi-Operand",
105				 sizeof(union acpi_operand_object),
106				 ACPI_MAX_OBJECT_CACHE_DEPTH,
107				 &acpi_gbl_operand_cache);
108	if (ACPI_FAILURE(status)) {
109		return (status);
110	}
111#ifdef ACPI_ASL_COMPILER
112	/*
113	 * For use with the ASL-/ASL+ option. This cache keeps track of regular
114	 * 0xA9 0x01 comments.
115	 */
116	status =
117	    acpi_os_create_cache("Acpi-Comment",
118				 sizeof(struct acpi_comment_node),
119				 ACPI_MAX_COMMENT_CACHE_DEPTH,
120				 &acpi_gbl_reg_comment_cache);
121	if (ACPI_FAILURE(status)) {
122		return (status);
123	}
124
125	/*
126	 * This cache keeps track of the starting addresses of where the comments
127	 * lie. This helps prevent duplication of comments.
128	 */
129	status =
130	    acpi_os_create_cache("Acpi-Comment-Addr",
131				 sizeof(struct acpi_comment_addr_node),
132				 ACPI_MAX_COMMENT_CACHE_DEPTH,
133				 &acpi_gbl_comment_addr_cache);
134	if (ACPI_FAILURE(status)) {
135		return (status);
136	}
137
138	/*
139	 * This cache will be used for nodes that represent files.
140	 */
141	status =
142	    acpi_os_create_cache("Acpi-File", sizeof(struct acpi_file_node),
143				 ACPI_MAX_COMMENT_CACHE_DEPTH,
144				 &acpi_gbl_file_cache);
145	if (ACPI_FAILURE(status)) {
146		return (status);
147	}
148#endif
149
150#ifdef ACPI_DBG_TRACK_ALLOCATIONS
151
152	/* Memory allocation lists */
153
154	status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
155	if (ACPI_FAILURE(status)) {
156		return (status);
157	}
158
159	status =
160	    acpi_ut_create_list("Acpi-Namespace",
161				sizeof(struct acpi_namespace_node),
162				&acpi_gbl_ns_node_list);
163	if (ACPI_FAILURE(status)) {
164		return (status);
165	}
166#endif
167
168	return (AE_OK);
169}
170
171/*******************************************************************************
172 *
173 * FUNCTION:    acpi_ut_delete_caches
174 *
175 * PARAMETERS:  None
176 *
177 * RETURN:      Status
178 *
179 * DESCRIPTION: Purge and delete all local caches
180 *
181 ******************************************************************************/
182
183acpi_status acpi_ut_delete_caches(void)
184{
185#ifdef ACPI_DBG_TRACK_ALLOCATIONS
186	char buffer[7];
187
188	if (acpi_gbl_display_final_mem_stats) {
189		strcpy(buffer, "MEMORY");
190		(void)acpi_db_display_statistics(buffer);
191	}
192#endif
193
194	(void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
195	acpi_gbl_namespace_cache = NULL;
196
197	(void)acpi_os_delete_cache(acpi_gbl_state_cache);
198	acpi_gbl_state_cache = NULL;
199
200	(void)acpi_os_delete_cache(acpi_gbl_operand_cache);
201	acpi_gbl_operand_cache = NULL;
202
203	(void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
204	acpi_gbl_ps_node_cache = NULL;
205
206	(void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
207	acpi_gbl_ps_node_ext_cache = NULL;
208
209#ifdef ACPI_ASL_COMPILER
210	(void)acpi_os_delete_cache(acpi_gbl_reg_comment_cache);
211	acpi_gbl_reg_comment_cache = NULL;
212
213	(void)acpi_os_delete_cache(acpi_gbl_comment_addr_cache);
214	acpi_gbl_comment_addr_cache = NULL;
215
216	(void)acpi_os_delete_cache(acpi_gbl_file_cache);
217	acpi_gbl_file_cache = NULL;
218#endif
219
220#ifdef ACPI_DBG_TRACK_ALLOCATIONS
221
222	/* Debug only - display leftover memory allocation, if any */
223
224	acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
225
226	/* Free memory lists */
227
228	acpi_os_free(acpi_gbl_global_list);
229	acpi_gbl_global_list = NULL;
230
231	acpi_os_free(acpi_gbl_ns_node_list);
232	acpi_gbl_ns_node_list = NULL;
233#endif
234
235	return (AE_OK);
236}
237
238/*******************************************************************************
239 *
240 * FUNCTION:    acpi_ut_validate_buffer
241 *
242 * PARAMETERS:  buffer              - Buffer descriptor to be validated
243 *
244 * RETURN:      Status
245 *
246 * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
247 *
248 ******************************************************************************/
249
250acpi_status acpi_ut_validate_buffer(struct acpi_buffer *buffer)
251{
252
253	/* Obviously, the structure pointer must be valid */
254
255	if (!buffer) {
256		return (AE_BAD_PARAMETER);
257	}
258
259	/* Special semantics for the length */
260
261	if ((buffer->length == ACPI_NO_BUFFER) ||
262	    (buffer->length == ACPI_ALLOCATE_BUFFER) ||
263	    (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
264		return (AE_OK);
265	}
266
267	/* Length is valid, the buffer pointer must be also */
268
269	if (!buffer->pointer) {
270		return (AE_BAD_PARAMETER);
271	}
272
273	return (AE_OK);
274}
275
276/*******************************************************************************
277 *
278 * FUNCTION:    acpi_ut_initialize_buffer
279 *
280 * PARAMETERS:  buffer              - Buffer to be validated
281 *              required_length     - Length needed
282 *
283 * RETURN:      Status
284 *
285 * DESCRIPTION: Validate that the buffer is of the required length or
286 *              allocate a new buffer. Returned buffer is always zeroed.
287 *
288 ******************************************************************************/
289
290acpi_status
291acpi_ut_initialize_buffer(struct acpi_buffer *buffer, acpi_size required_length)
292{
293	acpi_size input_buffer_length;
294
295	/* Parameter validation */
296
297	if (!buffer || !required_length) {
298		return (AE_BAD_PARAMETER);
299	}
300
301	/*
302	 * Buffer->Length is used as both an input and output parameter. Get the
303	 * input actual length and set the output required buffer length.
304	 */
305	input_buffer_length = buffer->length;
306	buffer->length = required_length;
307
308	/*
309	 * The input buffer length contains the actual buffer length, or the type
310	 * of buffer to be allocated by this routine.
311	 */
312	switch (input_buffer_length) {
313	case ACPI_NO_BUFFER:
314
315		/* Return the exception (and the required buffer length) */
316
317		return (AE_BUFFER_OVERFLOW);
318
319	case ACPI_ALLOCATE_BUFFER:
320		/*
321		 * Allocate a new buffer. We directectly call acpi_os_allocate here to
322		 * purposefully bypass the (optionally enabled) internal allocation
323		 * tracking mechanism since we only want to track internal
324		 * allocations. Note: The caller should use acpi_os_free to free this
325		 * buffer created via ACPI_ALLOCATE_BUFFER.
326		 */
327		buffer->pointer = acpi_os_allocate(required_length);
328		break;
329
330	case ACPI_ALLOCATE_LOCAL_BUFFER:
331
332		/* Allocate a new buffer with local interface to allow tracking */
333
334		buffer->pointer = ACPI_ALLOCATE(required_length);
335		break;
336
337	default:
338
339		/* Existing buffer: Validate the size of the buffer */
340
341		if (input_buffer_length < required_length) {
342			return (AE_BUFFER_OVERFLOW);
343		}
344		break;
345	}
346
347	/* Validate allocation from above or input buffer pointer */
348
349	if (!buffer->pointer) {
350		return (AE_NO_MEMORY);
351	}
352
353	/* Have a valid buffer, clear it */
354
355	memset(buffer->pointer, 0, required_length);
356	return (AE_OK);
357}