drivers/acpi/acpica/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   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 "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         ACPI_FUNCTION_TRACE(acpi_buffer_to_resource);
  76
  77         /*
  78          * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
  79          * is not required here.
  80          */
  81
  82         /* Get the required length for the converted resource */
  83
  84         status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
  85                                          &list_size_needed);
  86         if (status == AE_AML_NO_RESOURCE_END_TAG) {
  87                 status = AE_OK;
  88         }
  89         if (ACPI_FAILURE(status)) {
  90                 return_ACPI_STATUS(status);
  91         }
  92
  93         /* Allocate a buffer for the converted resource */
  94
  95         resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
  96         current_resource_ptr = resource;
  97         if (!resource) {
  98                 return_ACPI_STATUS(AE_NO_MEMORY);
  99         }
 100
 101         /* Perform the AML-to-Resource conversion */
 102
 103         status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length,
 104                                             acpi_rs_convert_aml_to_resources,
 105                                             &current_resource_ptr);
 106         if (status == AE_AML_NO_RESOURCE_END_TAG) {
 107                 status = AE_OK;
 108         }
 109         if (ACPI_FAILURE(status)) {
 110                 ACPI_FREE(resource);
 111         } else {
 112                 *resource_ptr = resource;
 113         }
 114
 115         return_ACPI_STATUS(status);
 116 }
 117
 118 ACPI_EXPORT_SYMBOL(acpi_buffer_to_resource)
 119
 120 /*******************************************************************************
 121  *
 122  * FUNCTION:    acpi_rs_create_resource_list
 123  *
 124  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
 125  *              output_buffer       - Pointer to the user's buffer
 126  *
 127  * RETURN:      Status: AE_OK if okay, else a valid acpi_status code
 128  *              If output_buffer is not large enough, output_buffer_length
 129  *              indicates how large output_buffer should be, else it
 130  *              indicates how may u8 elements of output_buffer are valid.
 131  *
 132  * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
 133  *              execution and parses the stream to create a linked list
 134  *              of device resources.
 135  *
 136  ******************************************************************************/
 137 acpi_status
 138 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
 139                              struct acpi_buffer *output_buffer)
 140 {
 141
 142         acpi_status status;
 143         u8 *aml_start;
 144         acpi_size list_size_needed = 0;
 145         u32 aml_buffer_length;
 146         void *resource;
 147
 148         ACPI_FUNCTION_TRACE(rs_create_resource_list);
 149
 150         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
 151
 152         /* Params already validated, so we don't re-validate here */
 153
 154         aml_buffer_length = aml_buffer->buffer.length;
 155         aml_start = aml_buffer->buffer.pointer;
 156
 157         /*
 158          * Pass the aml_buffer into a module that can calculate
 159          * the buffer size needed for the linked list
 160          */
 161         status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
 162                                          &list_size_needed);
 163
 164         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
 165                           status, (u32) list_size_needed));
 166         if (ACPI_FAILURE(status)) {
 167                 return_ACPI_STATUS(status);
 168         }
 169
 170         /* Validate/Allocate/Clear caller buffer */
 171
 172         status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 173         if (ACPI_FAILURE(status)) {
 174                 return_ACPI_STATUS(status);
 175         }
 176
 177         /* Do the conversion */
 178
 179         resource = output_buffer->pointer;
 180         status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length,
 181                                             acpi_rs_convert_aml_to_resources,
 182                                             &resource);
 183         if (ACPI_FAILURE(status)) {
 184                 return_ACPI_STATUS(status);
 185         }
 186
 187         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 188                           output_buffer->pointer, (u32) output_buffer->length));
 189         return_ACPI_STATUS(AE_OK);
 190 }
 191
 192 /*******************************************************************************
 193  *
 194  * FUNCTION:    acpi_rs_create_pci_routing_table
 195  *
 196  * PARAMETERS:  package_object          - Pointer to a package containing one
 197  *                                        of more ACPI_OPERAND_OBJECTs
 198  *              output_buffer           - Pointer to the user's buffer
 199  *
 200  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 201  *              If the output_buffer is too small, the error will be
 202  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 203  *              to the size buffer needed.
 204  *
 205  * DESCRIPTION: Takes the union acpi_operand_object package and creates a
 206  *              linked list of PCI interrupt descriptions
 207  *
 208  * NOTE: It is the caller's responsibility to ensure that the start of the
 209  * output buffer is aligned properly (if necessary).
 210  *
 211  ******************************************************************************/
 212
 213 acpi_status
 214 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 215                                  struct acpi_buffer *output_buffer)
 216 {
 217         u8 *buffer;
 218         union acpi_operand_object **top_object_list;
 219         union acpi_operand_object **sub_object_list;
 220         union acpi_operand_object *obj_desc;
 221         acpi_size buffer_size_needed = 0;
 222         u32 number_of_elements;
 223         u32 index;
 224         struct acpi_pci_routing_table *user_prt;
 225         struct acpi_namespace_node *node;
 226         acpi_status status;
 227         struct acpi_buffer path_buffer;
 228
 229         ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
 230
 231         /* Params already validated, so we don't re-validate here */
 232
 233         /* Get the required buffer length */
 234
 235         status = acpi_rs_get_pci_routing_table_length(package_object,
 236                                                       &buffer_size_needed);
 237         if (ACPI_FAILURE(status)) {
 238                 return_ACPI_STATUS(status);
 239         }
 240
 241         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
 242                           (u32) buffer_size_needed));
 243
 244         /* Validate/Allocate/Clear caller buffer */
 245
 246         status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 247         if (ACPI_FAILURE(status)) {
 248                 return_ACPI_STATUS(status);
 249         }
 250
 251         /*
 252          * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
 253          * package that in turn contains an u64 Address, a u8 Pin,
 254          * a Name, and a u8 source_index.
 255          */
 256         top_object_list = package_object->package.elements;
 257         number_of_elements = package_object->package.count;
 258         buffer = output_buffer->pointer;
 259         user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 260
 261         for (index = 0; index < number_of_elements; index++) {
 262
 263                 /*
 264                  * Point user_prt past this current structure
 265                  *
 266                  * NOTE: On the first iteration, user_prt->Length will
 267                  * be zero because we cleared the return buffer earlier
 268                  */
 269                 buffer += user_prt->length;
 270                 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 271
 272                 /*
 273                  * Fill in the Length field with the information we have at this point.
 274                  * The minus four is to subtract the size of the u8 Source[4] member
 275                  * because it is added below.
 276                  */
 277                 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 278
 279                 /* Each subpackage must be of length 4 */
 280
 281                 if ((*top_object_list)->package.count != 4) {
 282                         ACPI_ERROR((AE_INFO,
 283                                     "(PRT[%u]) Need package of length 4, found length %u",
 284                                     index, (*top_object_list)->package.count));
 285                         return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 286                 }
 287
 288                 /*
 289                  * Dereference the subpackage.
 290                  * The sub_object_list will now point to an array of the four IRQ
 291                  * elements: [Address, Pin, Source, source_index]
 292                  */
 293                 sub_object_list = (*top_object_list)->package.elements;
 294
 295                 /* 1) First subobject: Dereference the PRT.Address */
 296
 297                 obj_desc = sub_object_list[0];
 298                 if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
 299                         ACPI_ERROR((AE_INFO,
 300                                     "(PRT[%u].Address) Need Integer, found %s",
 301                                     index,
 302                                     acpi_ut_get_object_type_name(obj_desc)));
 303                         return_ACPI_STATUS(AE_BAD_DATA);
 304                 }
 305
 306                 user_prt->address = obj_desc->integer.value;
 307
 308                 /* 2) Second subobject: Dereference the PRT.Pin */
 309
 310                 obj_desc = sub_object_list[1];
 311                 if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
 312                         ACPI_ERROR((AE_INFO,
 313                                     "(PRT[%u].Pin) Need Integer, found %s",
 314                                     index,
 315                                     acpi_ut_get_object_type_name(obj_desc)));
 316                         return_ACPI_STATUS(AE_BAD_DATA);
 317                 }
 318
 319                 user_prt->pin = (u32) obj_desc->integer.value;
 320
 321                 /*
 322                  * 3) Third subobject: Dereference the PRT.source_name
 323                  * The name may be unresolved (slack mode), so allow a null object
 324                  */
 325                 obj_desc = sub_object_list[2];
 326                 if (obj_desc) {
 327                         switch (obj_desc->common.type) {
 328                         case ACPI_TYPE_LOCAL_REFERENCE:
 329
 330                                 if (obj_desc->reference.class !=
 331                                     ACPI_REFCLASS_NAME) {
 332                                         ACPI_ERROR((AE_INFO,
 333                                                     "(PRT[%u].Source) Need name, found Reference Class 0x%X",
 334                                                     index,
 335                                                     obj_desc->reference.class));
 336                                         return_ACPI_STATUS(AE_BAD_DATA);
 337                                 }
 338
 339                                 node = obj_desc->reference.node;
 340
 341                                 /* Use *remaining* length of the buffer as max for pathname */
 342
 343                                 path_buffer.length = output_buffer->length -
 344                                     (u32) ((u8 *) user_prt->source -
 345                                            (u8 *) output_buffer->pointer);
 346                                 path_buffer.pointer = user_prt->source;
 347
 348                                 status =
 349                                     acpi_ns_handle_to_pathname((acpi_handle)
 350                                                                node,
 351                                                                &path_buffer);
 352
 353                                 /* +1 to include null terminator */
 354
 355                                 user_prt->length +=
 356                                     (u32) ACPI_STRLEN(user_prt->source) + 1;
 357                                 break;
 358
 359                         case ACPI_TYPE_STRING:
 360
 361                                 ACPI_STRCPY(user_prt->source,
 362                                             obj_desc->string.pointer);
 363
 364                                 /*
 365                                  * Add to the Length field the length of the string
 366                                  * (add 1 for terminator)
 367                                  */
 368                                 user_prt->length += obj_desc->string.length + 1;
 369                                 break;
 370
 371                         case ACPI_TYPE_INTEGER:
 372                                 /*
 373                                  * If this is a number, then the Source Name is NULL, since the
 374                                  * entire buffer was zeroed out, we can leave this alone.
 375                                  *
 376                                  * Add to the Length field the length of the u32 NULL
 377                                  */
 378                                 user_prt->length += sizeof(u32);
 379                                 break;
 380
 381                         default:
 382
 383                                 ACPI_ERROR((AE_INFO,
 384                                             "(PRT[%u].Source) Need Ref/String/Integer, found %s",
 385                                             index,
 386                                             acpi_ut_get_object_type_name
 387                                             (obj_desc)));
 388                                 return_ACPI_STATUS(AE_BAD_DATA);
 389                         }
 390                 }
 391
 392                 /* Now align the current length */
 393
 394                 user_prt->length =
 395                     (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
 396
 397                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 398
 399                 obj_desc = sub_object_list[3];
 400                 if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
 401                         ACPI_ERROR((AE_INFO,
 402                                     "(PRT[%u].SourceIndex) Need Integer, found %s",
 403                                     index,
 404                                     acpi_ut_get_object_type_name(obj_desc)));
 405                         return_ACPI_STATUS(AE_BAD_DATA);
 406                 }
 407
 408                 user_prt->source_index = (u32) obj_desc->integer.value;
 409
 410                 /* Point to the next union acpi_operand_object in the top level package */
 411
 412                 top_object_list++;
 413         }
 414
 415         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 416                           output_buffer->pointer, (u32) output_buffer->length));
 417         return_ACPI_STATUS(AE_OK);
 418 }
 419
 420 /*******************************************************************************
 421  *
 422  * FUNCTION:    acpi_rs_create_aml_resources
 423  *
 424  * PARAMETERS:  resource_list           - Pointer to the resource list buffer
 425  *              output_buffer           - Where the AML buffer is returned
 426  *
 427  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 428  *              If the output_buffer is too small, the error will be
 429  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 430  *              to the size buffer needed.
 431  *
 432  * DESCRIPTION: Converts a list of device resources to an AML bytestream
 433  *              to be used as input for the _SRS control method.
 434  *
 435  ******************************************************************************/
 436
 437 acpi_status
 438 acpi_rs_create_aml_resources(struct acpi_buffer *resource_list,
 439                              struct acpi_buffer *output_buffer)
 440 {
 441         acpi_status status;
 442         acpi_size aml_size_needed = 0;
 443
 444         ACPI_FUNCTION_TRACE(rs_create_aml_resources);
 445
 446         /* Params already validated, no need to re-validate here */
 447
 448         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n",
 449                           resource_list->pointer));
 450
 451         /* Get the buffer size needed for the AML byte stream */
 452
 453         status = acpi_rs_get_aml_length(resource_list->pointer,
 454                                         resource_list->length,
 455                                         &aml_size_needed);
 456
 457         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
 458                           (u32)aml_size_needed, acpi_format_exception(status)));
 459         if (ACPI_FAILURE(status)) {
 460                 return_ACPI_STATUS(status);
 461         }
 462
 463         /* Validate/Allocate/Clear caller buffer */
 464
 465         status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
 466         if (ACPI_FAILURE(status)) {
 467                 return_ACPI_STATUS(status);
 468         }
 469
 470         /* Do the conversion */
 471
 472         status = acpi_rs_convert_resources_to_aml(resource_list->pointer,
 473                                                   aml_size_needed,
 474                                                   output_buffer->pointer);
 475         if (ACPI_FAILURE(status)) {
 476                 return_ACPI_STATUS(status);
 477         }
 478
 479         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 480                           output_buffer->pointer, (u32) output_buffer->length));
 481         return_ACPI_STATUS(AE_OK);
 482 }