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