drivers/acpi/acpica/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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_buffer_to_resource
  55  *
  56  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
  57  *              aml_buffer_length   - Length of the aml_buffer
  58  *              resource_ptr        - Where the converted resource is returned
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Convert a raw AML buffer to a resource list
  63  *
  64  ******************************************************************************/
  65 acpi_status
  66 acpi_buffer_to_resource(u8 *aml_buffer,
  67                         u16 aml_buffer_length,
  68                         struct acpi_resource **resource_ptr)
  69 {
  70         acpi_status status;
  71         acpi_size list_size_needed;
  72         void *resource;
  73         void *current_resource_ptr;
  74
  75         /*
  76          * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
  77          * is not required here.
  78          */
  79
  80         /* Get the required length for the converted resource */
  81
  82         status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
  83                                          &list_size_needed);
  84         if (status == AE_AML_NO_RESOURCE_END_TAG) {
  85                 status = AE_OK;
  86         }
  87         if (ACPI_FAILURE(status)) {
  88                 return (status);
  89         }
  90
  91         /* Allocate a buffer for the converted resource */
  92
  93         resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
  94         current_resource_ptr = resource;
  95         if (!resource) {
  96                 return (AE_NO_MEMORY);
  97         }
  98
  99         /* Perform the AML-to-Resource conversion */
 100
 101         status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length,
 102                                             acpi_rs_convert_aml_to_resources,
 103                                             &current_resource_ptr);
 104         if (status == AE_AML_NO_RESOURCE_END_TAG) {
 105                 status = AE_OK;
 106         }
 107         if (ACPI_FAILURE(status)) {
 108                 ACPI_FREE(resource);
 109         } else {
 110                 *resource_ptr = resource;
 111         }
 112
 113         return (status);
 114 }
 115
 116 /*******************************************************************************
 117  *
 118  * FUNCTION:    acpi_rs_create_resource_list
 119  *
 120  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 121  *              output_buffer       - Pointer to the user's buffer
 122  *
 123  * RETURN:      Status: AE_OK if okay, else a valid acpi_status code
 124  *              If output_buffer is not large enough, output_buffer_length
 125  *              indicates how large output_buffer should be, else it
 126  *              indicates how may u8 elements of output_buffer are valid.
 127  *
 128  * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
 129  *              execution and parses the stream to create a linked list
 130  *              of device resources.
 131  *
 132  ******************************************************************************/
 133
 134 acpi_status
 135 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
 136                              struct acpi_buffer * output_buffer)
 137 {
 138
 139         acpi_status status;
 140         u8 *aml_start;
 141         acpi_size list_size_needed = 0;
 142         u32 aml_buffer_length;
 143         void *resource;
 144
 145         ACPI_FUNCTION_TRACE(rs_create_resource_list);
 146
 147         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
 148
 149         /* Params already validated, so we don't re-validate here */
 150
 151         aml_buffer_length = aml_buffer->buffer.length;
 152         aml_start = aml_buffer->buffer.pointer;
 153
 154         /*
 155          * Pass the aml_buffer into a module that can calculate
 156          * the buffer size needed for the linked list
 157          */
 158         status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
 159                                          &list_size_needed);
 160
 161         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
 162                           status, (u32) list_size_needed));
 163         if (ACPI_FAILURE(status)) {
 164                 return_ACPI_STATUS(status);
 165         }
 166
 167         /* Validate/Allocate/Clear caller buffer */
 168
 169         status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 170         if (ACPI_FAILURE(status)) {
 171                 return_ACPI_STATUS(status);
 172         }
 173
 174         /* Do the conversion */
 175
 176         resource = output_buffer->pointer;
 177         status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length,
 178                                             acpi_rs_convert_aml_to_resources,
 179                                             &resource);
 180         if (ACPI_FAILURE(status)) {
 181                 return_ACPI_STATUS(status);
 182         }
 183
 184         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 185                           output_buffer->pointer, (u32) output_buffer->length));
 186         return_ACPI_STATUS(AE_OK);
 187 }
 188
 189 /*******************************************************************************
 190  *
 191  * FUNCTION:    acpi_rs_create_pci_routing_table
 192  *
 193  * PARAMETERS:  package_object          - Pointer to a package containing one
 194  *                                        of more ACPI_OPERAND_OBJECTs
 195  *              output_buffer           - Pointer to the user's buffer
 196  *
 197  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 198  *              If the output_buffer is too small, the error will be
 199  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 200  *              to the size buffer needed.
 201  *
 202  * DESCRIPTION: Takes the union acpi_operand_object package and creates a
 203  *              linked list of PCI interrupt descriptions
 204  *
 205  * NOTE: It is the caller's responsibility to ensure that the start of the
 206  * output buffer is aligned properly (if necessary).
 207  *
 208  ******************************************************************************/
 209
 210 acpi_status
 211 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 212                                  struct acpi_buffer *output_buffer)
 213 {
 214         u8 *buffer;
 215         union acpi_operand_object **top_object_list;
 216         union acpi_operand_object **sub_object_list;
 217         union acpi_operand_object *obj_desc;
 218         acpi_size buffer_size_needed = 0;
 219         u32 number_of_elements;
 220         u32 index;
 221         struct acpi_pci_routing_table *user_prt;
 222         struct acpi_namespace_node *node;
 223         acpi_status status;
 224         struct acpi_buffer path_buffer;
 225
 226         ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
 227
 228         /* Params already validated, so we don't re-validate here */
 229
 230         /* Get the required buffer length */
 231
 232         status = acpi_rs_get_pci_routing_table_length(package_object,
 233                                                       &buffer_size_needed);
 234         if (ACPI_FAILURE(status)) {
 235                 return_ACPI_STATUS(status);
 236         }
 237
 238         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
 239                           (u32) buffer_size_needed));
 240
 241         /* Validate/Allocate/Clear caller buffer */
 242
 243         status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 244         if (ACPI_FAILURE(status)) {
 245                 return_ACPI_STATUS(status);
 246         }
 247
 248         /*
 249          * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
 250          * package that in turn contains an u64 Address, a u8 Pin,
 251          * a Name, and a u8 source_index.
 252          */
 253         top_object_list = package_object->package.elements;
 254         number_of_elements = package_object->package.count;
 255         buffer = output_buffer->pointer;
 256         user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 257
 258         for (index = 0; index < number_of_elements; index++) {
 259
 260                 /*
 261                  * Point user_prt past this current structure
 262                  *
 263                  * NOTE: On the first iteration, user_prt->Length will
 264                  * be zero because we cleared the return buffer earlier
 265                  */
 266                 buffer += user_prt->length;
 267                 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 268
 269                 /*
 270                  * Fill in the Length field with the information we have at this point.
 271                  * The minus four is to subtract the size of the u8 Source[4] member
 272                  * because it is added below.
 273                  */
 274                 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 275
 276                 /* Each sub-package must be of length 4 */
 277
 278                 if ((*top_object_list)->package.count != 4) {
 279                         ACPI_ERROR((AE_INFO,
 280                                     "(PRT[%u]) Need package of length 4, found length %u",
 281                                     index, (*top_object_list)->package.count));
 282                         return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 283                 }
 284
 285                 /*
 286                  * Dereference the sub-package.
 287                  * The sub_object_list will now point to an array of the four IRQ
 288                  * elements: [Address, Pin, Source, source_index]
 289                  */
 290                 sub_object_list = (*top_object_list)->package.elements;
 291
 292                 /* 1) First subobject: Dereference the PRT.Address */
 293
 294                 obj_desc = sub_object_list[0];
 295                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 296                         ACPI_ERROR((AE_INFO,
 297                                     "(PRT[%u].Address) Need Integer, found %s",
 298                                     index,
 299                                     acpi_ut_get_object_type_name(obj_desc)));
 300                         return_ACPI_STATUS(AE_BAD_DATA);
 301                 }
 302
 303                 user_prt->address = obj_desc->integer.value;
 304
 305                 /* 2) Second subobject: Dereference the PRT.Pin */
 306
 307                 obj_desc = sub_object_list[1];
 308                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 309                         ACPI_ERROR((AE_INFO,
 310                                     "(PRT[%u].Pin) Need Integer, found %s",
 311                                     index,
 312                                     acpi_ut_get_object_type_name(obj_desc)));
 313                         return_ACPI_STATUS(AE_BAD_DATA);
 314                 }
 315
 316                 user_prt->pin = (u32) obj_desc->integer.value;
 317
 318                 /*
 319                  * 3) Third subobject: Dereference the PRT.source_name
 320                  * The name may be unresolved (slack mode), so allow a null object
 321                  */
 322                 obj_desc = sub_object_list[2];
 323                 if (obj_desc) {
 324                         switch (obj_desc->common.type) {
 325                         case ACPI_TYPE_LOCAL_REFERENCE:
 326
 327                                 if (obj_desc->reference.class !=
 328                                     ACPI_REFCLASS_NAME) {
 329                                         ACPI_ERROR((AE_INFO,
 330                                                     "(PRT[%u].Source) Need name, found Reference Class 0x%X",
 331                                                     index,
 332                                                     obj_desc->reference.class));
 333                                         return_ACPI_STATUS(AE_BAD_DATA);
 334                                 }
 335
 336                                 node = obj_desc->reference.node;
 337
 338                                 /* Use *remaining* length of the buffer as max for pathname */
 339
 340                                 path_buffer.length = output_buffer->length -
 341                                     (u32) ((u8 *) user_prt->source -
 342                                            (u8 *) output_buffer->pointer);
 343                                 path_buffer.pointer = user_prt->source;
 344
 345                                 status =
 346                                     acpi_ns_handle_to_pathname((acpi_handle)
 347                                                                node,
 348                                                                &path_buffer);
 349
 350                                 /* +1 to include null terminator */
 351
 352                                 user_prt->length +=
 353                                     (u32) ACPI_STRLEN(user_prt->source) + 1;
 354                                 break;
 355
 356                         case ACPI_TYPE_STRING:
 357
 358                                 ACPI_STRCPY(user_prt->source,
 359                                             obj_desc->string.pointer);
 360
 361                                 /*
 362                                  * Add to the Length field the length of the string
 363                                  * (add 1 for terminator)
 364                                  */
 365                                 user_prt->length += obj_desc->string.length + 1;
 366                                 break;
 367
 368                         case ACPI_TYPE_INTEGER:
 369                                 /*
 370                                  * If this is a number, then the Source Name is NULL, since the
 371                                  * entire buffer was zeroed out, we can leave this alone.
 372                                  *
 373                                  * Add to the Length field the length of the u32 NULL
 374                                  */
 375                                 user_prt->length += sizeof(u32);
 376                                 break;
 377
 378                         default:
 379
 380                                 ACPI_ERROR((AE_INFO,
 381                                             "(PRT[%u].Source) Need Ref/String/Integer, found %s",
 382                                             index,
 383                                             acpi_ut_get_object_type_name
 384                                             (obj_desc)));
 385                                 return_ACPI_STATUS(AE_BAD_DATA);
 386                         }
 387                 }
 388
 389                 /* Now align the current length */
 390
 391                 user_prt->length =
 392                     (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
 393
 394                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 395
 396                 obj_desc = sub_object_list[3];
 397                 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
 398                         ACPI_ERROR((AE_INFO,
 399                                     "(PRT[%u].SourceIndex) Need Integer, found %s",
 400                                     index,
 401                                     acpi_ut_get_object_type_name(obj_desc)));
 402                         return_ACPI_STATUS(AE_BAD_DATA);
 403                 }
 404
 405                 user_prt->source_index = (u32) obj_desc->integer.value;
 406
 407                 /* Point to the next union acpi_operand_object in the top level package */
 408
 409                 top_object_list++;
 410         }
 411
 412         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 413                           output_buffer->pointer, (u32) output_buffer->length));
 414         return_ACPI_STATUS(AE_OK);
 415 }
 416
 417 /*******************************************************************************
 418  *
 419  * FUNCTION:    acpi_rs_create_aml_resources
 420  *
 421  * PARAMETERS:  resource_list           - Pointer to the resource list buffer
 422  *              output_buffer           - Where the AML buffer is returned
 423  *
 424  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 425  *              If the output_buffer is too small, the error will be
 426  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 427  *              to the size buffer needed.
 428  *
 429  * DESCRIPTION: Converts a list of device resources to an AML bytestream
 430  *              to be used as input for the _SRS control method.
 431  *
 432  ******************************************************************************/
 433
 434 acpi_status
 435 acpi_rs_create_aml_resources(struct acpi_buffer *resource_list,
 436                              struct acpi_buffer *output_buffer)
 437 {
 438         acpi_status status;
 439         acpi_size aml_size_needed = 0;
 440
 441         ACPI_FUNCTION_TRACE(rs_create_aml_resources);
 442
 443         /* Params already validated, no need to re-validate here */
 444
 445         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n",
 446                           resource_list->pointer));
 447
 448         /* Get the buffer size needed for the AML byte stream */
 449
 450         status = acpi_rs_get_aml_length(resource_list->pointer,
 451                                         resource_list->length,
 452                                         &aml_size_needed);
 453
 454         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
 455                           (u32)aml_size_needed, acpi_format_exception(status)));
 456         if (ACPI_FAILURE(status)) {
 457                 return_ACPI_STATUS(status);
 458         }
 459
 460         /* Validate/Allocate/Clear caller buffer */
 461
 462         status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
 463         if (ACPI_FAILURE(status)) {
 464                 return_ACPI_STATUS(status);
 465         }
 466
 467         /* Do the conversion */
 468
 469         status = acpi_rs_convert_resources_to_aml(resource_list->pointer,
 470                                                   aml_size_needed,
 471                                                   output_buffer->pointer);
 472         if (ACPI_FAILURE(status)) {
 473                 return_ACPI_STATUS(status);
 474         }
 475
 476         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 477                           output_buffer->pointer, (u32) output_buffer->length));
 478         return_ACPI_STATUS(AE_OK);
 479 }