err.no Git - linux-2.6/blob - drivers/acpi/utilities/utalloc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utalloc - local memory allocation routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   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 #include <acpi/acdebug.h>
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utalloc")
  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 acpi_status acpi_ut_create_caches(void)
  62 {
  63         acpi_status status;
  64
  65         /* Object Caches, for frequently used objects */
  66
  67         status =
  68             acpi_os_create_cache("Acpi-Namespace",
  69                                  sizeof(struct acpi_namespace_node),
  70                                  ACPI_MAX_NAMESPACE_CACHE_DEPTH,
  71                                  &acpi_gbl_namespace_cache);
  72         if (ACPI_FAILURE(status)) {
  73                 return (status);
  74         }
  75
  76         status =
  77             acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state),
  78                                  ACPI_MAX_STATE_CACHE_DEPTH,
  79                                  &acpi_gbl_state_cache);
  80         if (ACPI_FAILURE(status)) {
  81                 return (status);
  82         }
  83
  84         status =
  85             acpi_os_create_cache("Acpi-Parse",
  86                                  sizeof(struct acpi_parse_obj_common),
  87                                  ACPI_MAX_PARSE_CACHE_DEPTH,
  88                                  &acpi_gbl_ps_node_cache);
  89         if (ACPI_FAILURE(status)) {
  90                 return (status);
  91         }
  92
  93         status =
  94             acpi_os_create_cache("Acpi-ParseExt",
  95                                  sizeof(struct acpi_parse_obj_named),
  96                                  ACPI_MAX_EXTPARSE_CACHE_DEPTH,
  97                                  &acpi_gbl_ps_node_ext_cache);
  98         if (ACPI_FAILURE(status)) {
  99                 return (status);
 100         }
 101
 102         status =
 103             acpi_os_create_cache("Acpi-Operand",
 104                                  sizeof(union acpi_operand_object),
 105                                  ACPI_MAX_OBJECT_CACHE_DEPTH,
 106                                  &acpi_gbl_operand_cache);
 107         if (ACPI_FAILURE(status)) {
 108                 return (status);
 109         }
 110
 111 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 112
 113         /* Memory allocation lists */
 114
 115         status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
 116         if (ACPI_FAILURE(status)) {
 117                 return (status);
 118         }
 119
 120         status =
 121             acpi_ut_create_list("Acpi-Namespace",
 122                                 sizeof(struct acpi_namespace_node),
 123                                 &acpi_gbl_ns_node_list);
 124         if (ACPI_FAILURE(status)) {
 125                 return (status);
 126         }
 127 #endif
 128
 129         return (AE_OK);
 130 }
 131
 132 /*******************************************************************************
 133  *
 134  * FUNCTION:    acpi_ut_delete_caches
 135  *
 136  * PARAMETERS:  None
 137  *
 138  * RETURN:      Status
 139  *
 140  * DESCRIPTION: Purge and delete all local caches
 141  *
 142  ******************************************************************************/
 143
 144 acpi_status acpi_ut_delete_caches(void)
 145 {
 146 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 147         char buffer[7];
 148
 149         if (acpi_gbl_display_final_mem_stats) {
 150                 ACPI_STRCPY(buffer, "MEMORY");
 151                 acpi_db_display_statistics(buffer);
 152         }
 153 #endif
 154
 155         (void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
 156         acpi_gbl_namespace_cache = NULL;
 157
 158         (void)acpi_os_delete_cache(acpi_gbl_state_cache);
 159         acpi_gbl_state_cache = NULL;
 160
 161         (void)acpi_os_delete_cache(acpi_gbl_operand_cache);
 162         acpi_gbl_operand_cache = NULL;
 163
 164         (void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
 165         acpi_gbl_ps_node_cache = NULL;
 166
 167         (void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
 168         acpi_gbl_ps_node_ext_cache = NULL;
 169
 170 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 171
 172         /* Debug only - display leftover memory allocation, if any */
 173
 174         acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
 175
 176         /* Free memory lists */
 177
 178         ACPI_FREE(acpi_gbl_global_list);
 179         acpi_gbl_global_list = NULL;
 180
 181         ACPI_FREE(acpi_gbl_ns_node_list);
 182         acpi_gbl_ns_node_list = NULL;
 183 #endif
 184
 185         return (AE_OK);
 186 }
 187
 188 /*******************************************************************************
 189  *
 190  * FUNCTION:    acpi_ut_validate_buffer
 191  *
 192  * PARAMETERS:  Buffer              - Buffer descriptor to be validated
 193  *
 194  * RETURN:      Status
 195  *
 196  * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
 197  *
 198  ******************************************************************************/
 199
 200 acpi_status acpi_ut_validate_buffer(struct acpi_buffer * buffer)
 201 {
 202
 203         /* Obviously, the structure pointer must be valid */
 204
 205         if (!buffer) {
 206                 return (AE_BAD_PARAMETER);
 207         }
 208
 209         /* Special semantics for the length */
 210
 211         if ((buffer->length == ACPI_NO_BUFFER) ||
 212             (buffer->length == ACPI_ALLOCATE_BUFFER) ||
 213             (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
 214                 return (AE_OK);
 215         }
 216
 217         /* Length is valid, the buffer pointer must be also */
 218
 219         if (!buffer->pointer) {
 220                 return (AE_BAD_PARAMETER);
 221         }
 222
 223         return (AE_OK);
 224 }
 225
 226 /*******************************************************************************
 227  *
 228  * FUNCTION:    acpi_ut_initialize_buffer
 229  *
 230  * PARAMETERS:  Buffer              - Buffer to be validated
 231  *              required_length     - Length needed
 232  *
 233  * RETURN:      Status
 234  *
 235  * DESCRIPTION: Validate that the buffer is of the required length or
 236  *              allocate a new buffer.  Returned buffer is always zeroed.
 237  *
 238  ******************************************************************************/
 239
 240 acpi_status
 241 acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
 242                           acpi_size required_length)
 243 {
 244         acpi_status status = AE_OK;
 245
 246         switch (buffer->length) {
 247         case ACPI_NO_BUFFER:
 248
 249                 /* Set the exception and returned the required length */
 250
 251                 status = AE_BUFFER_OVERFLOW;
 252                 break;
 253
 254         case ACPI_ALLOCATE_BUFFER:
 255
 256                 /* Allocate a new buffer */
 257
 258                 buffer->pointer = acpi_os_allocate(required_length);
 259                 if (!buffer->pointer) {
 260                         return (AE_NO_MEMORY);
 261                 }
 262
 263                 /* Clear the buffer */
 264
 265                 ACPI_MEMSET(buffer->pointer, 0, required_length);
 266                 break;
 267
 268         case ACPI_ALLOCATE_LOCAL_BUFFER:
 269
 270                 /* Allocate a new buffer with local interface to allow tracking */
 271
 272                 buffer->pointer = ACPI_ALLOCATE_ZEROED(required_length);
 273                 if (!buffer->pointer) {
 274                         return (AE_NO_MEMORY);
 275                 }
 276                 break;
 277
 278         default:
 279
 280                 /* Existing buffer: Validate the size of the buffer */
 281
 282                 if (buffer->length < required_length) {
 283                         status = AE_BUFFER_OVERFLOW;
 284                         break;
 285                 }
 286
 287                 /* Clear the buffer */
 288
 289                 ACPI_MEMSET(buffer->pointer, 0, required_length);
 290                 break;
 291         }
 292
 293         buffer->length = required_length;
 294         return (status);
 295 }
 296
 297 #ifdef NOT_USED_BY_LINUX
 298 /*******************************************************************************
 299  *
 300  * FUNCTION:    acpi_ut_allocate
 301  *
 302  * PARAMETERS:  Size                - Size of the allocation
 303  *              Component           - Component type of caller
 304  *              Module              - Source file name of caller
 305  *              Line                - Line number of caller
 306  *
 307  * RETURN:      Address of the allocated memory on success, NULL on failure.
 308  *
 309  * DESCRIPTION: Subsystem equivalent of malloc.
 310  *
 311  ******************************************************************************/
 312
 313 void *acpi_ut_allocate(acpi_size size, u32 component, char *module, u32 line)
 314 {
 315         void *allocation;
 316
 317         ACPI_FUNCTION_TRACE_U32(ut_allocate, size);
 318
 319         /* Check for an inadvertent size of zero bytes */
 320
 321         if (!size) {
 322                 ACPI_WARNING((module, line,
 323                               "Attempt to allocate zero bytes, allocating 1 byte"));
 324                 size = 1;
 325         }
 326
 327         allocation = acpi_os_allocate(size);
 328         if (!allocation) {
 329
 330                 /* Report allocation error */
 331
 332                 ACPI_WARNING((module, line,
 333                               "Could not allocate size %X", (u32) size));
 334
 335                 return_PTR(NULL);
 336         }
 337
 338         return_PTR(allocation);
 339 }
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    acpi_ut_allocate_zeroed
 344  *
 345  * PARAMETERS:  Size                - Size of the allocation
 346  *              Component           - Component type of caller
 347  *              Module              - Source file name of caller
 348  *              Line                - Line number of caller
 349  *
 350  * RETURN:      Address of the allocated memory on success, NULL on failure.
 351  *
 352  * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
 353  *
 354  ******************************************************************************/
 355
 356 void *acpi_ut_allocate_zeroed(acpi_size size,
 357                               u32 component, char *module, u32 line)
 358 {
 359         void *allocation;
 360
 361         ACPI_FUNCTION_ENTRY();
 362
 363         allocation = acpi_ut_allocate(size, component, module, line);
 364         if (allocation) {
 365
 366                 /* Clear the memory block */
 367
 368                 ACPI_MEMSET(allocation, 0, size);
 369         }
 370
 371         return (allocation);
 372 }
 373 #endif