release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, 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 "acresrc.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_RESOURCES
  50 ACPI_MODULE_NAME("rscreate")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_rs_create_resource_list
  55  *
  56  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
  57  *              output_buffer       - Pointer to the user's buffer
  58  *
  59  * RETURN:      Status: AE_OK if okay, else a valid acpi_status code
  60  *              If output_buffer is not large enough, output_buffer_length
  61  *              indicates how large output_buffer should be, else it
  62  *              indicates how may u8 elements of output_buffer are valid.
  63  *
  64  * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
  65  *              execution and parses the stream to create a linked list
  66  *              of device resources.
  67  *
  68  ******************************************************************************/
  69 acpi_status
  70 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
  71                              struct acpi_buffer *output_buffer)
  72 {
  73
  74         acpi_status status;
  75         u8 *aml_start;
  76         acpi_size list_size_needed = 0;
  77         u32 aml_buffer_length;
  78         void *resource;
  79
  80         ACPI_FUNCTION_TRACE(rs_create_resource_list);
  81
  82         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
  83
  84         /* Params already validated, so we don't re-validate here */
  85
  86         aml_buffer_length = aml_buffer->buffer.length;
  87         aml_start = aml_buffer->buffer.pointer;
  88
  89         /*
  90          * Pass the aml_buffer into a module that can calculate
  91          * the buffer size needed for the linked list
  92          */
  93         status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
  94                                          &list_size_needed);
  95
  96         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
  97                           status, (u32) list_size_needed));
  98         if (ACPI_FAILURE(status)) {
  99                 return_ACPI_STATUS(status);
 100         }
 101
 102         /* Validate/Allocate/Clear caller buffer */
 103
 104         status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 105         if (ACPI_FAILURE(status)) {
 106                 return_ACPI_STATUS(status);
 107         }
 108
 109         /* Do the conversion */
 110
 111         resource = output_buffer->pointer;
 112         status = acpi_ut_walk_aml_resources(aml_start, aml_buffer_length,
 113                                             acpi_rs_convert_aml_to_resources,
 114                                             &resource);
 115         if (ACPI_FAILURE(status)) {
 116                 return_ACPI_STATUS(status);
 117         }
 118
 119         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 120                           output_buffer->pointer, (u32) output_buffer->length));
 121         return_ACPI_STATUS(AE_OK);
 122 }
 123
 124 /*******************************************************************************
 125  *
 126  * FUNCTION:    acpi_rs_create_pci_routing_table
 127  *
 128  * PARAMETERS:  package_object          - Pointer to a union acpi_operand_object
 129  *                                        package
 130  *              output_buffer           - Pointer to the user's buffer
 131  *
 132  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 133  *              If the output_buffer is too small, the error will be
 134  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 135  *              to the size buffer needed.
 136  *
 137  * DESCRIPTION: Takes the union acpi_operand_object    package and creates a
 138  *              linked list of PCI interrupt descriptions
 139  *
 140  * NOTE: It is the caller's responsibility to ensure that the start of the
 141  * output buffer is aligned properly (if necessary).
 142  *
 143  ******************************************************************************/
 144
 145 acpi_status
 146 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 147                                  struct acpi_buffer *output_buffer)
 148 {
 149         u8 *buffer;
 150         union acpi_operand_object **top_object_list;
 151         union acpi_operand_object **sub_object_list;
 152         union acpi_operand_object *obj_desc;
 153         acpi_size buffer_size_needed = 0;
 154         u32 number_of_elements;
 155         u32 index;
 156         struct acpi_pci_routing_table *user_prt;
 157         struct acpi_namespace_node *node;
 158         acpi_status status;
 159         struct acpi_buffer path_buffer;
 160
 161         ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
 162
 163         /* Params already validated, so we don't re-validate here */
 164
 165         /* Get the required buffer length */
 166
 167         status = acpi_rs_get_pci_routing_table_length(package_object,
 168                                                       &buffer_size_needed);
 169         if (ACPI_FAILURE(status)) {
 170                 return_ACPI_STATUS(status);
 171         }
 172
 173         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
 174                           (u32) buffer_size_needed));
 175
 176         /* Validate/Allocate/Clear caller buffer */
 177
 178         status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 179         if (ACPI_FAILURE(status)) {
 180                 return_ACPI_STATUS(status);
 181         }
 182
 183         /*
 184          * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
 185          * package that in turn contains an u64 Address, a u8 Pin,
 186          * a Name, and a u8 source_index.
 187          */
 188         top_object_list = package_object->package.elements;
 189         number_of_elements = package_object->package.count;
 190         buffer = output_buffer->pointer;
 191         user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 192
 193         for (index = 0; index < number_of_elements; index++) {
 194
 195                 /*
 196                  * Point user_prt past this current structure
 197                  *
 198                  * NOTE: On the first iteration, user_prt->Length will
 199                  * be zero because we cleared the return buffer earlier
 200                  */
 201                 buffer += user_prt->length;
 202                 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 203
 204                 /*
 205                  * Fill in the Length field with the information we have at this point.
 206                  * The minus four is to subtract the size of the u8 Source[4] member
 207                  * because it is added below.
 208                  */
 209                 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 210
 211                 /* Each element of the top-level package must also be a package */
 212
 213                 if ((*top_object_list)->common.type != ACPI_TYPE_PACKAGE) {
 214                         ACPI_ERROR((AE_INFO,
 215                                     "(PRT[%u]) Need sub-package, found %s",
 216                                     index,
 217                                     acpi_ut_get_object_type_name
 218                                     (*top_object_list)));
 219                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 220                 }
 221
 222                 /* Each sub-package must be of length 4 */
 223
 224                 if ((*top_object_list)->package.count != 4) {
 225                         ACPI_ERROR((AE_INFO,
 226                                     "(PRT[%u]) Need package of length 4, found length %u",
 227                                     index, (*top_object_list)->package.count));
 228                         return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 229                 }
 230
 231                 /*
 232                  * Dereference the sub-package.
 233                  * The sub_object_list will now point to an array of the four IRQ
 234                  * elements: [Address, Pin, Source, source_index]
 235                  */
 236                 sub_object_list = (*top_object_list)->package.elements;
 237
 238                 /* 1) First subobject: Dereference the PRT.Address */
 239
 240                 obj_desc = sub_object_list[0];
 241                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 242                         ACPI_ERROR((AE_INFO,
 243                                     "(PRT[%u].Address) Need Integer, found %s",
 244                                     index,
 245                                     acpi_ut_get_object_type_name(obj_desc)));
 246                         return_ACPI_STATUS(AE_BAD_DATA);
 247                 }
 248
 249                 user_prt->address = obj_desc->integer.value;
 250
 251                 /* 2) Second subobject: Dereference the PRT.Pin */
 252
 253                 obj_desc = sub_object_list[1];
 254                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 255                         ACPI_ERROR((AE_INFO,
 256                                     "(PRT[%u].Pin) Need Integer, found %s",
 257                                     index,
 258                                     acpi_ut_get_object_type_name(obj_desc)));
 259                         return_ACPI_STATUS(AE_BAD_DATA);
 260                 }
 261
 262                 user_prt->pin = (u32) obj_desc->integer.value;
 263
 264                 obj_desc = sub_object_list[3];
 265                 if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
 266                         sub_object_list[3] = sub_object_list[2];
 267                         sub_object_list[2] = obj_desc;
 268
 269                         ACPI_WARNING((AE_INFO,
 270                                       "(PRT[%X].Source) SourceName and SourceIndex are reversed, fixed",
 271                                       index));
 272                 }
 273
 274                 /*
 275                  * 3) Third subobject: Dereference the PRT.source_name
 276                  * The name may be unresolved (slack mode), so allow a null object
 277                  */
 278                 obj_desc = sub_object_list[2];
 279                 if (obj_desc) {
 280                         switch (obj_desc->common.type) {
 281                         case ACPI_TYPE_LOCAL_REFERENCE:
 282
 283                                 if (obj_desc->reference.class !=
 284                                     ACPI_REFCLASS_NAME) {
 285                                         ACPI_ERROR((AE_INFO,
 286                                                     "(PRT[%u].Source) Need name, found Reference Class 0x%X",
 287                                                     index,
 288                                                     obj_desc->reference.class));
 289                                         return_ACPI_STATUS(AE_BAD_DATA);
 290                                 }
 291
 292                                 node = obj_desc->reference.node;
 293
 294                                 /* Use *remaining* length of the buffer as max for pathname */
 295
 296                                 path_buffer.length = output_buffer->length -
 297                                     (u32) ((u8 *) user_prt->source -
 298                                            (u8 *) output_buffer->pointer);
 299                                 path_buffer.pointer = user_prt->source;
 300
 301                                 status =
 302                                     acpi_ns_handle_to_pathname((acpi_handle)
 303                                                                node,
 304                                                                &path_buffer);
 305
 306                                 /* +1 to include null terminator */
 307
 308                                 user_prt->length +=
 309                                     (u32) ACPI_STRLEN(user_prt->source) + 1;
 310                                 break;
 311
 312                         case ACPI_TYPE_STRING:
 313
 314                                 ACPI_STRCPY(user_prt->source,
 315                                             obj_desc->string.pointer);
 316
 317                                 /*
 318                                  * Add to the Length field the length of the string
 319                                  * (add 1 for terminator)
 320                                  */
 321                                 user_prt->length += obj_desc->string.length + 1;
 322                                 break;
 323
 324                         case ACPI_TYPE_INTEGER:
 325                                 /*
 326                                  * If this is a number, then the Source Name is NULL, since the
 327                                  * entire buffer was zeroed out, we can leave this alone.
 328                                  *
 329                                  * Add to the Length field the length of the u32 NULL
 330                                  */
 331                                 user_prt->length += sizeof(u32);
 332                                 break;
 333
 334                         default:
 335
 336                                 ACPI_ERROR((AE_INFO,
 337                                             "(PRT[%u].Source) Need Ref/String/Integer, found %s",
 338                                             index,
 339                                             acpi_ut_get_object_type_name
 340                                             (obj_desc)));
 341                                 return_ACPI_STATUS(AE_BAD_DATA);
 342                         }
 343                 }
 344
 345                 /* Now align the current length */
 346
 347                 user_prt->length =
 348                     (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
 349
 350                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 351
 352                 obj_desc = sub_object_list[3];
 353                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 354                         ACPI_ERROR((AE_INFO,
 355                                     "(PRT[%u].SourceIndex) Need Integer, found %s",
 356                                     index,
 357                                     acpi_ut_get_object_type_name(obj_desc)));
 358                         return_ACPI_STATUS(AE_BAD_DATA);
 359                 }
 360
 361                 user_prt->source_index = (u32) obj_desc->integer.value;
 362
 363                 /* Point to the next union acpi_operand_object in the top level package */
 364
 365                 top_object_list++;
 366         }
 367
 368         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 369                           output_buffer->pointer, (u32) output_buffer->length));
 370         return_ACPI_STATUS(AE_OK);
 371 }
 372
 373 /*******************************************************************************
 374  *
 375  * FUNCTION:    acpi_rs_create_aml_resources
 376  *
 377  * PARAMETERS:  linked_list_buffer      - Pointer to the resource linked list
 378  *              output_buffer           - Pointer to the user's buffer
 379  *
 380  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 381  *              If the output_buffer is too small, the error will be
 382  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 383  *              to the size buffer needed.
 384  *
 385  * DESCRIPTION: Takes the linked list of device resources and
 386  *              creates a bytestream to be used as input for the
 387  *              _SRS control method.
 388  *
 389  ******************************************************************************/
 390
 391 acpi_status
 392 acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer,
 393                              struct acpi_buffer *output_buffer)
 394 {
 395         acpi_status status;
 396         acpi_size aml_size_needed = 0;
 397
 398         ACPI_FUNCTION_TRACE(rs_create_aml_resources);
 399
 400         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "LinkedListBuffer = %p\n",
 401                           linked_list_buffer));
 402
 403         /*
 404          * Params already validated, so we don't re-validate here
 405          *
 406          * Pass the linked_list_buffer into a module that calculates
 407          * the buffer size needed for the byte stream.
 408          */
 409         status = acpi_rs_get_aml_length(linked_list_buffer, &aml_size_needed);
 410
 411         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
 412                           (u32) aml_size_needed,
 413                           acpi_format_exception(status)));
 414         if (ACPI_FAILURE(status)) {
 415                 return_ACPI_STATUS(status);
 416         }
 417
 418         /* Validate/Allocate/Clear caller buffer */
 419
 420         status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
 421         if (ACPI_FAILURE(status)) {
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         /* Do the conversion */
 426
 427         status =
 428             acpi_rs_convert_resources_to_aml(linked_list_buffer,
 429                                              aml_size_needed,
 430                                              output_buffer->pointer);
 431         if (ACPI_FAILURE(status)) {
 432                 return_ACPI_STATUS(status);
 433         }
 434
 435         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 436                           output_buffer->pointer, (u32) output_buffer->length));
 437         return_ACPI_STATUS(AE_OK);
 438 }