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 - 2006, 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
  46 #define _COMPONENT          ACPI_UTILITIES
  47 ACPI_MODULE_NAME("utalloc")
  48
  49 /*******************************************************************************
  50  *
  51  * FUNCTION:    acpi_ut_create_caches
  52  *
  53  * PARAMETERS:  None
  54  *
  55  * RETURN:      Status
  56  *
  57  * DESCRIPTION: Create all local caches
  58  *
  59  ******************************************************************************/
  60 acpi_status acpi_ut_create_caches(void)
  61 {
  62         acpi_status status;
  63
  64         /* Object Caches, for frequently used objects */
  65
  66         status =
  67             acpi_os_create_cache("Acpi-Namespace",
  68                                  sizeof(struct acpi_namespace_node),
  69                                  ACPI_MAX_NAMESPACE_CACHE_DEPTH,
  70                                  &acpi_gbl_namespace_cache);
  71         if (ACPI_FAILURE(status)) {
  72                 return (status);
  73         }
  74
  75         status =
  76             acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state),
  77                                  ACPI_MAX_STATE_CACHE_DEPTH,
  78                                  &acpi_gbl_state_cache);
  79         if (ACPI_FAILURE(status)) {
  80                 return (status);
  81         }
  82
  83         status =
  84             acpi_os_create_cache("Acpi-Parse",
  85                                  sizeof(struct acpi_parse_obj_common),
  86                                  ACPI_MAX_PARSE_CACHE_DEPTH,
  87                                  &acpi_gbl_ps_node_cache);
  88         if (ACPI_FAILURE(status)) {
  89                 return (status);
  90         }
  91
  92         status =
  93             acpi_os_create_cache("Acpi-ParseExt",
  94                                  sizeof(struct acpi_parse_obj_named),
  95                                  ACPI_MAX_EXTPARSE_CACHE_DEPTH,
  96                                  &acpi_gbl_ps_node_ext_cache);
  97         if (ACPI_FAILURE(status)) {
  98                 return (status);
  99         }
 100
 101         status =
 102             acpi_os_create_cache("Acpi-Operand",
 103                                  sizeof(union acpi_operand_object),
 104                                  ACPI_MAX_OBJECT_CACHE_DEPTH,
 105                                  &acpi_gbl_operand_cache);
 106         if (ACPI_FAILURE(status)) {
 107                 return (status);
 108         }
 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
 146         (void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
 147         acpi_gbl_namespace_cache = NULL;
 148
 149         (void)acpi_os_delete_cache(acpi_gbl_state_cache);
 150         acpi_gbl_state_cache = NULL;
 151
 152         (void)acpi_os_delete_cache(acpi_gbl_operand_cache);
 153         acpi_gbl_operand_cache = NULL;
 154
 155         (void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
 156         acpi_gbl_ps_node_cache = NULL;
 157
 158         (void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
 159         acpi_gbl_ps_node_ext_cache = NULL;
 160
 161 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 162
 163         /* Debug only - display leftover memory allocation, if any */
 164
 165         acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
 166
 167         /* Free memory lists */
 168
 169         ACPI_FREE(acpi_gbl_global_list);
 170         acpi_gbl_global_list = NULL;
 171
 172         ACPI_FREE(acpi_gbl_ns_node_list);
 173         acpi_gbl_ns_node_list = NULL;
 174 #endif
 175
 176         return (AE_OK);
 177 }
 178
 179 /*******************************************************************************
 180  *
 181  * FUNCTION:    acpi_ut_validate_buffer
 182  *
 183  * PARAMETERS:  Buffer              - Buffer descriptor to be validated
 184  *
 185  * RETURN:      Status
 186  *
 187  * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
 188  *
 189  ******************************************************************************/
 190
 191 acpi_status acpi_ut_validate_buffer(struct acpi_buffer * buffer)
 192 {
 193
 194         /* Obviously, the structure pointer must be valid */
 195
 196         if (!buffer) {
 197                 return (AE_BAD_PARAMETER);
 198         }
 199
 200         /* Special semantics for the length */
 201
 202         if ((buffer->length == ACPI_NO_BUFFER) ||
 203             (buffer->length == ACPI_ALLOCATE_BUFFER) ||
 204             (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
 205                 return (AE_OK);
 206         }
 207
 208         /* Length is valid, the buffer pointer must be also */
 209
 210         if (!buffer->pointer) {
 211                 return (AE_BAD_PARAMETER);
 212         }
 213
 214         return (AE_OK);
 215 }
 216
 217 /*******************************************************************************
 218  *
 219  * FUNCTION:    acpi_ut_initialize_buffer
 220  *
 221  * PARAMETERS:  Buffer              - Buffer to be validated
 222  *              required_length     - Length needed
 223  *
 224  * RETURN:      Status
 225  *
 226  * DESCRIPTION: Validate that the buffer is of the required length or
 227  *              allocate a new buffer.  Returned buffer is always zeroed.
 228  *
 229  ******************************************************************************/
 230
 231 acpi_status
 232 acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
 233                           acpi_size required_length)
 234 {
 235         acpi_status status = AE_OK;
 236
 237         switch (buffer->length) {
 238         case ACPI_NO_BUFFER:
 239
 240                 /* Set the exception and returned the required length */
 241
 242                 status = AE_BUFFER_OVERFLOW;
 243                 break;
 244
 245         case ACPI_ALLOCATE_BUFFER:
 246
 247                 /* Allocate a new buffer */
 248
 249                 buffer->pointer = acpi_os_allocate(required_length);
 250                 if (!buffer->pointer) {
 251                         return (AE_NO_MEMORY);
 252                 }
 253
 254                 /* Clear the buffer */
 255
 256                 ACPI_MEMSET(buffer->pointer, 0, required_length);
 257                 break;
 258
 259         case ACPI_ALLOCATE_LOCAL_BUFFER:
 260
 261                 /* Allocate a new buffer with local interface to allow tracking */
 262
 263                 buffer->pointer = ACPI_ALLOCATE_ZEROED(required_length);
 264                 if (!buffer->pointer) {
 265                         return (AE_NO_MEMORY);
 266                 }
 267                 break;
 268
 269         default:
 270
 271                 /* Existing buffer: Validate the size of the buffer */
 272
 273                 if (buffer->length < required_length) {
 274                         status = AE_BUFFER_OVERFLOW;
 275                         break;
 276                 }
 277
 278                 /* Clear the buffer */
 279
 280                 ACPI_MEMSET(buffer->pointer, 0, required_length);
 281                 break;
 282         }
 283
 284         buffer->length = required_length;
 285         return (status);
 286 }
 287
 288 #ifdef NOT_USED_BY_LINUX
 289 /*******************************************************************************
 290  *
 291  * FUNCTION:    acpi_ut_allocate
 292  *
 293  * PARAMETERS:  Size                - Size of the allocation
 294  *              Component           - Component type of caller
 295  *              Module              - Source file name of caller
 296  *              Line                - Line number of caller
 297  *
 298  * RETURN:      Address of the allocated memory on success, NULL on failure.
 299  *
 300  * DESCRIPTION: Subsystem equivalent of malloc.
 301  *
 302  ******************************************************************************/
 303
 304 void *acpi_ut_allocate(acpi_size size, u32 component, char *module, u32 line)
 305 {
 306         void *allocation;
 307
 308         ACPI_FUNCTION_TRACE_U32(ut_allocate, size);
 309
 310         /* Check for an inadvertent size of zero bytes */
 311
 312         if (!size) {
 313                 ACPI_WARNING((module, line,
 314                               "Attempt to allocate zero bytes, allocating 1 byte"));
 315                 size = 1;
 316         }
 317
 318         allocation = acpi_os_allocate(size);
 319         if (!allocation) {
 320
 321                 /* Report allocation error */
 322
 323                 ACPI_WARNING((module, line,
 324                               "Could not allocate size %X", (u32) size));
 325
 326                 return_PTR(NULL);
 327         }
 328
 329         return_PTR(allocation);
 330 }
 331
 332 /*******************************************************************************
 333  *
 334  * FUNCTION:    acpi_ut_allocate_zeroed
 335  *
 336  * PARAMETERS:  Size                - Size of the allocation
 337  *              Component           - Component type of caller
 338  *              Module              - Source file name of caller
 339  *              Line                - Line number of caller
 340  *
 341  * RETURN:      Address of the allocated memory on success, NULL on failure.
 342  *
 343  * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
 344  *
 345  ******************************************************************************/
 346
 347 void *acpi_ut_allocate_zeroed(acpi_size size,
 348                               u32 component, char *module, u32 line)
 349 {
 350         void *allocation;
 351
 352         ACPI_FUNCTION_ENTRY();
 353
 354         allocation = acpi_ut_allocate(size, component, module, line);
 355         if (allocation) {
 356
 357                 /* Clear the memory block */
 358
 359                 ACPI_MEMSET(allocation, 0, size);
 360         }
 361
 362         return (allocation);
 363 }
 364 #endif