drivers/acpi/acpica/utalloc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utalloc - local memory allocation routines
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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_DBG_TRACK_ALLOCATIONS
 146
 147         /* Memory allocation lists */
 148
 149         status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
 150         if (ACPI_FAILURE(status)) {
 151                 return (status);
 152         }
 153
 154         status =
 155             acpi_ut_create_list("Acpi-Namespace",
 156                                 sizeof(struct acpi_namespace_node),
 157                                 &acpi_gbl_ns_node_list);
 158         if (ACPI_FAILURE(status)) {
 159                 return (status);
 160         }
 161 #endif
 162
 163         return (AE_OK);
 164 }
 165
 166 /*******************************************************************************
 167  *
 168  * FUNCTION:    acpi_ut_delete_caches
 169  *
 170  * PARAMETERS:  None
 171  *
 172  * RETURN:      Status
 173  *
 174  * DESCRIPTION: Purge and delete all local caches
 175  *
 176  ******************************************************************************/
 177
 178 acpi_status acpi_ut_delete_caches(void)
 179 {
 180 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 181         char buffer[7];
 182
 183         if (acpi_gbl_display_final_mem_stats) {
 184                 strcpy(buffer, "MEMORY");
 185                 (void)acpi_db_display_statistics(buffer);
 186         }
 187 #endif
 188
 189         (void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
 190         acpi_gbl_namespace_cache = NULL;
 191
 192         (void)acpi_os_delete_cache(acpi_gbl_state_cache);
 193         acpi_gbl_state_cache = NULL;
 194
 195         (void)acpi_os_delete_cache(acpi_gbl_operand_cache);
 196         acpi_gbl_operand_cache = NULL;
 197
 198         (void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
 199         acpi_gbl_ps_node_cache = NULL;
 200
 201         (void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
 202         acpi_gbl_ps_node_ext_cache = NULL;
 203
 204 #ifdef ACPI_DBG_TRACK_ALLOCATIONS
 205
 206         /* Debug only - display leftover memory allocation, if any */
 207
 208         acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
 209
 210         /* Free memory lists */
 211
 212         acpi_os_free(acpi_gbl_global_list);
 213         acpi_gbl_global_list = NULL;
 214
 215         acpi_os_free(acpi_gbl_ns_node_list);
 216         acpi_gbl_ns_node_list = NULL;
 217 #endif
 218
 219         return (AE_OK);
 220 }
 221
 222 /*******************************************************************************
 223  *
 224  * FUNCTION:    acpi_ut_validate_buffer
 225  *
 226  * PARAMETERS:  buffer              - Buffer descriptor to be validated
 227  *
 228  * RETURN:      Status
 229  *
 230  * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
 231  *
 232  ******************************************************************************/
 233
 234 acpi_status acpi_ut_validate_buffer(struct acpi_buffer * buffer)
 235 {
 236
 237         /* Obviously, the structure pointer must be valid */
 238
 239         if (!buffer) {
 240                 return (AE_BAD_PARAMETER);
 241         }
 242
 243         /* Special semantics for the length */
 244
 245         if ((buffer->length == ACPI_NO_BUFFER) ||
 246             (buffer->length == ACPI_ALLOCATE_BUFFER) ||
 247             (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
 248                 return (AE_OK);
 249         }
 250
 251         /* Length is valid, the buffer pointer must be also */
 252
 253         if (!buffer->pointer) {
 254                 return (AE_BAD_PARAMETER);
 255         }
 256
 257         return (AE_OK);
 258 }
 259
 260 /*******************************************************************************
 261  *
 262  * FUNCTION:    acpi_ut_initialize_buffer
 263  *
 264  * PARAMETERS:  buffer              - Buffer to be validated
 265  *              required_length     - Length needed
 266  *
 267  * RETURN:      Status
 268  *
 269  * DESCRIPTION: Validate that the buffer is of the required length or
 270  *              allocate a new buffer. Returned buffer is always zeroed.
 271  *
 272  ******************************************************************************/
 273
 274 acpi_status
 275 acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
 276                           acpi_size required_length)
 277 {
 278         acpi_size input_buffer_length;
 279
 280         /* Parameter validation */
 281
 282         if (!buffer || !required_length) {
 283                 return (AE_BAD_PARAMETER);
 284         }
 285
 286         /*
 287          * Buffer->Length is used as both an input and output parameter. Get the
 288          * input actual length and set the output required buffer length.
 289          */
 290         input_buffer_length = buffer->length;
 291         buffer->length = required_length;
 292
 293         /*
 294          * The input buffer length contains the actual buffer length, or the type
 295          * of buffer to be allocated by this routine.
 296          */
 297         switch (input_buffer_length) {
 298         case ACPI_NO_BUFFER:
 299
 300                 /* Return the exception (and the required buffer length) */
 301
 302                 return (AE_BUFFER_OVERFLOW);
 303
 304         case ACPI_ALLOCATE_BUFFER:
 305                 /*
 306                  * Allocate a new buffer. We directectly call acpi_os_allocate here to
 307                  * purposefully bypass the (optionally enabled) internal allocation
 308                  * tracking mechanism since we only want to track internal
 309                  * allocations. Note: The caller should use acpi_os_free to free this
 310                  * buffer created via ACPI_ALLOCATE_BUFFER.
 311                  */
 312                 buffer->pointer = acpi_os_allocate(required_length);
 313                 break;
 314
 315         case ACPI_ALLOCATE_LOCAL_BUFFER:
 316
 317                 /* Allocate a new buffer with local interface to allow tracking */
 318
 319                 buffer->pointer = ACPI_ALLOCATE(required_length);
 320                 break;
 321
 322         default:
 323
 324                 /* Existing buffer: Validate the size of the buffer */
 325
 326                 if (input_buffer_length < required_length) {
 327                         return (AE_BUFFER_OVERFLOW);
 328                 }
 329                 break;
 330         }
 331
 332         /* Validate allocation from above or input buffer pointer */
 333
 334         if (!buffer->pointer) {
 335                 return (AE_NO_MEMORY);
 336         }
 337
 338         /* Have a valid buffer, clear it */
 339
 340         memset(buffer->pointer, 0, required_length);
 341         return (AE_OK);
 342 }