drivers/acpi/acpica/utalloc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utalloc - local memory allocation routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   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 "accommon.h"
  46 #include "acdebug.h"
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("utalloc")
  50
  51 #if !defined (USE_NATIVE_ALLOCATE_ZEROED)
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_os_allocate_zeroed
  55  *
  56  * PARAMETERS:  size                - Size of the allocation
  57  *
  58  * RETURN:      Address of the allocated memory on success, NULL on failure.
  59  *
  60  * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
  61  *              This is the default implementation. Can be overridden via the
  62  *              USE_NATIVE_ALLOCATE_ZEROED flag.
  63  *
  64  ******************************************************************************/
  65 void *acpi_os_allocate_zeroed(acpi_size size)
  66 {
  67         void *allocation;
  68
  69         ACPI_FUNCTION_ENTRY();
  70
  71         allocation = acpi_os_allocate(size);
  72         if (allocation) {
  73
  74                 /* Clear the memory block */
  75
  76                 memset(allocation, 0, size);
  77         }
  78
  79         return (allocation);
  80 }
  81
  82 #endif                          /* !USE_NATIVE_ALLOCATE_ZEROED */
  83
  84 /*******************************************************************************
  85  *
  86  * FUNCTION:    acpi_ut_create_caches
  87  *
  88  * PARAMETERS:  None
  89  *
  90  * RETURN:      Status
  91  *
  92  * DESCRIPTION: Create all local caches
  93  *
  94  ******************************************************************************/
  95
  96 acpi_status acpi_ut_create_caches(void)
  97 {
  98         acpi_status status;
  99
 100         /* Object Caches, for frequently used objects */
 101
 102         status =
 103             acpi_os_create_cache("Acpi-Namespace",
 104                                  sizeof(struct acpi_namespace_node),
 105                                  ACPI_MAX_NAMESPACE_CACHE_DEPTH,
 106                                  &acpi_gbl_namespace_cache);
 107         if (ACPI_FAILURE(status)) {
 108                 return (status);
 109         }
 110
 111         status =
 112             acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state),
 113                                  ACPI_MAX_STATE_CACHE_DEPTH,
 114                                  &acpi_gbl_state_cache);
 115         if (ACPI_FAILURE(status)) {
 116                 return (status);
 117         }
 118
 119         status =
 120             acpi_os_create_cache("Acpi-Parse",
 121                                  sizeof(struct acpi_parse_obj_common),
 122                                  ACPI_MAX_PARSE_CACHE_DEPTH,
 123                                  &acpi_gbl_ps_node_cache);
 124         if (ACPI_FAILURE(status)) {
 125                 return (status);
 126         }
 127
 128         status =
 129             acpi_os_create_cache("Acpi-ParseExt",
 130                                  sizeof(struct acpi_parse_obj_named),
 131                                  ACPI_MAX_EXTPARSE_CACHE_DEPTH,
 132                                  &acpi_gbl_ps_node_ext_cache);
 133         if (ACPI_FAILURE(status)) {
 134                 return (status);
 135         }
 136
 137         status =
 138             acpi_os_create_cache("Acpi-Operand",
 139                                  sizeof(union acpi_operand_object),
 140                                  ACPI_MAX_OBJECT_CACHE_DEPTH,
 141                                  &acpi_gbl_operand_cache);
 142         if (ACPI_FAILURE(status)) {
 143                 return (status);
 144         }
 145 #ifdef ACPI_ASL_COMPILER
 146         /*
 147          * For use with the ASL-/ASL+ option. This cache keeps track of regular
 148          * 0xA9 0x01 comments.
 149          */
 150         status =
 151             acpi_os_create_cache("Acpi-Comment",
 152                                  sizeof(struct acpi_comment_node),
 153                                  ACPI_MAX_COMMENT_CACHE_DEPTH,
 154                                  &acpi_gbl_reg_comment_cache);
 155         if (ACPI_FAILURE(status)) {
 156                 return (status);
 157         }
 158
 159         /*
 160          * This cache keeps track of the starting addresses of where the comments
 161          * lie. This helps prevent duplication of comments.
 162          */
 163         status =
 164             acpi_os_create_cache("Acpi-Comment-Addr",
 165                                  sizeof(struct acpi_comment_addr_node),
 166                                  ACPI_MAX_COMMENT_CACHE_DEPTH,
 167                                  &acpi_gbl_comment_addr_cache);
 168         if (ACPI_FAILURE(status)) {
 169                 return (status);
 170         }
 171
 172         /*
 173          * This cache will be used for nodes that represent files.
 174          */
 175         status =
 176             acpi_os_create_cache("Acpi-File", sizeof(struct acpi_file_node),
 177                                  ACPI_MAX_COMMENT_CACHE_DEPTH,
 178                                  &acpi_gbl_file_cache);
 179         if (ACPI_FAILURE(status)) {
 180                 return (status);
 181         }
 182 #endif
 183
 184 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 185
 186         /* Memory allocation lists */
 187
 188         status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
 189         if (ACPI_FAILURE(status)) {
 190                 return (status);
 191         }
 192
 193         status =
 194             acpi_ut_create_list("Acpi-Namespace",
 195                                 sizeof(struct acpi_namespace_node),
 196                                 &acpi_gbl_ns_node_list);
 197         if (ACPI_FAILURE(status)) {
 198                 return (status);
 199         }
 200 #endif
 201
 202         return (AE_OK);
 203 }
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_ut_delete_caches
 208  *
 209  * PARAMETERS:  None
 210  *
 211  * RETURN:      Status
 212  *
 213  * DESCRIPTION: Purge and delete all local caches
 214  *
 215  ******************************************************************************/
 216
 217 acpi_status acpi_ut_delete_caches(void)
 218 {
 219 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 220         char buffer[7];
 221
 222         if (acpi_gbl_display_final_mem_stats) {
 223                 strcpy(buffer, "MEMORY");
 224                 (void)acpi_db_display_statistics(buffer);
 225         }
 226 #endif
 227
 228         (void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
 229         acpi_gbl_namespace_cache = NULL;
 230
 231         (void)acpi_os_delete_cache(acpi_gbl_state_cache);
 232         acpi_gbl_state_cache = NULL;
 233
 234         (void)acpi_os_delete_cache(acpi_gbl_operand_cache);
 235         acpi_gbl_operand_cache = NULL;
 236
 237         (void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
 238         acpi_gbl_ps_node_cache = NULL;
 239
 240         (void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
 241         acpi_gbl_ps_node_ext_cache = NULL;
 242
 243 #ifdef ACPI_ASL_COMPILER
 244         (void)acpi_os_delete_cache(acpi_gbl_reg_comment_cache);
 245         acpi_gbl_reg_comment_cache = NULL;
 246
 247         (void)acpi_os_delete_cache(acpi_gbl_comment_addr_cache);
 248         acpi_gbl_comment_addr_cache = NULL;
 249
 250         (void)acpi_os_delete_cache(acpi_gbl_file_cache);
 251         acpi_gbl_file_cache = NULL;
 252 #endif
 253
 254 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 255
 256         /* Debug only - display leftover memory allocation, if any */
 257
 258         acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
 259
 260         /* Free memory lists */
 261
 262         acpi_os_free(acpi_gbl_global_list);
 263         acpi_gbl_global_list = NULL;
 264
 265         acpi_os_free(acpi_gbl_ns_node_list);
 266         acpi_gbl_ns_node_list = NULL;
 267 #endif
 268
 269         return (AE_OK);
 270 }
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_ut_validate_buffer
 275  *
 276  * PARAMETERS:  buffer              - Buffer descriptor to be validated
 277  *
 278  * RETURN:      Status
 279  *
 280  * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
 281  *
 282  ******************************************************************************/
 283
 284 acpi_status acpi_ut_validate_buffer(struct acpi_buffer *buffer)
 285 {
 286
 287         /* Obviously, the structure pointer must be valid */
 288
 289         if (!buffer) {
 290                 return (AE_BAD_PARAMETER);
 291         }
 292
 293         /* Special semantics for the length */
 294
 295         if ((buffer->length == ACPI_NO_BUFFER) ||
 296             (buffer->length == ACPI_ALLOCATE_BUFFER) ||
 297             (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
 298                 return (AE_OK);
 299         }
 300
 301         /* Length is valid, the buffer pointer must be also */
 302
 303         if (!buffer->pointer) {
 304                 return (AE_BAD_PARAMETER);
 305         }
 306
 307         return (AE_OK);
 308 }
 309
 310 /*******************************************************************************
 311  *
 312  * FUNCTION:    acpi_ut_initialize_buffer
 313  *
 314  * PARAMETERS:  buffer              - Buffer to be validated
 315  *              required_length     - Length needed
 316  *
 317  * RETURN:      Status
 318  *
 319  * DESCRIPTION: Validate that the buffer is of the required length or
 320  *              allocate a new buffer. Returned buffer is always zeroed.
 321  *
 322  ******************************************************************************/
 323
 324 acpi_status
 325 acpi_ut_initialize_buffer(struct acpi_buffer *buffer, acpi_size required_length)
 326 {
 327         acpi_size input_buffer_length;
 328
 329         /* Parameter validation */
 330
 331         if (!buffer || !required_length) {
 332                 return (AE_BAD_PARAMETER);
 333         }
 334
 335         /*
 336          * Buffer->Length is used as both an input and output parameter. Get the
 337          * input actual length and set the output required buffer length.
 338          */
 339         input_buffer_length = buffer->length;
 340         buffer->length = required_length;
 341
 342         /*
 343          * The input buffer length contains the actual buffer length, or the type
 344          * of buffer to be allocated by this routine.
 345          */
 346         switch (input_buffer_length) {
 347         case ACPI_NO_BUFFER:
 348
 349                 /* Return the exception (and the required buffer length) */
 350
 351                 return (AE_BUFFER_OVERFLOW);
 352
 353         case ACPI_ALLOCATE_BUFFER:
 354                 /*
 355                  * Allocate a new buffer. We directectly call acpi_os_allocate here to
 356                  * purposefully bypass the (optionally enabled) internal allocation
 357                  * tracking mechanism since we only want to track internal
 358                  * allocations. Note: The caller should use acpi_os_free to free this
 359                  * buffer created via ACPI_ALLOCATE_BUFFER.
 360                  */
 361                 buffer->pointer = acpi_os_allocate(required_length);
 362                 break;
 363
 364         case ACPI_ALLOCATE_LOCAL_BUFFER:
 365
 366                 /* Allocate a new buffer with local interface to allow tracking */
 367
 368                 buffer->pointer = ACPI_ALLOCATE(required_length);
 369                 break;
 370
 371         default:
 372
 373                 /* Existing buffer: Validate the size of the buffer */
 374
 375                 if (input_buffer_length < required_length) {
 376                         return (AE_BUFFER_OVERFLOW);
 377                 }
 378                 break;
 379         }
 380
 381         /* Validate allocation from above or input buffer pointer */
 382
 383         if (!buffer->pointer) {
 384                 return (AE_NO_MEMORY);
 385         }
 386
 387         /* Have a valid buffer, clear it */
 388
 389         memset(buffer->pointer, 0, required_length);
 390         return (AE_OK);
 391 }