drivers/acpi/acpica/utresrc.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utresrc - Resource management utilities
   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 "acresrc.h"
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("utresrc")
  50
  51 /*
  52  * Base sizes of the raw AML resource descriptors, indexed by resource type.
  53  * Zero indicates a reserved (and therefore invalid) resource type.
  54  */
  55 const u8 acpi_gbl_resource_aml_sizes[] = {
  56         /* Small descriptors */
  57
  58         0,
  59         0,
  60         0,
  61         0,
  62         ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
  63         ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
  64         ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
  65         ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
  66         ACPI_AML_SIZE_SMALL(struct aml_resource_io),
  67         ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
  68         ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_dma),
  69         0,
  70         0,
  71         0,
  72         ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
  73         ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
  74
  75         /* Large descriptors */
  76
  77         0,
  78         ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
  79         ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
  80         0,
  81         ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
  82         ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
  83         ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
  84         ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
  85         ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
  86         ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
  87         ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
  88         ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64),
  89         ACPI_AML_SIZE_LARGE(struct aml_resource_gpio),
  90         ACPI_AML_SIZE_LARGE(struct aml_resource_pin_function),
  91         ACPI_AML_SIZE_LARGE(struct aml_resource_common_serialbus),
  92         ACPI_AML_SIZE_LARGE(struct aml_resource_pin_config),
  93         ACPI_AML_SIZE_LARGE(struct aml_resource_pin_group),
  94         ACPI_AML_SIZE_LARGE(struct aml_resource_pin_group_function),
  95         ACPI_AML_SIZE_LARGE(struct aml_resource_pin_group_config),
  96 };
  97
  98 const u8 acpi_gbl_resource_aml_serial_bus_sizes[] = {
  99         0,
 100         ACPI_AML_SIZE_LARGE(struct aml_resource_i2c_serialbus),
 101         ACPI_AML_SIZE_LARGE(struct aml_resource_spi_serialbus),
 102         ACPI_AML_SIZE_LARGE(struct aml_resource_uart_serialbus),
 103 };
 104
 105 /*
 106  * Resource types, used to validate the resource length field.
 107  * The length of fixed-length types must match exactly, variable
 108  * lengths must meet the minimum required length, etc.
 109  * Zero indicates a reserved (and therefore invalid) resource type.
 110  */
 111 static const u8 acpi_gbl_resource_types[] = {
 112         /* Small descriptors */
 113
 114         0,
 115         0,
 116         0,
 117         0,
 118         ACPI_SMALL_VARIABLE_LENGTH,     /* 04 IRQ */
 119         ACPI_FIXED_LENGTH,      /* 05 DMA */
 120         ACPI_SMALL_VARIABLE_LENGTH,     /* 06 start_dependent_functions */
 121         ACPI_FIXED_LENGTH,      /* 07 end_dependent_functions */
 122         ACPI_FIXED_LENGTH,      /* 08 IO */
 123         ACPI_FIXED_LENGTH,      /* 09 fixed_IO */
 124         ACPI_FIXED_LENGTH,      /* 0A fixed_DMA */
 125         0,
 126         0,
 127         0,
 128         ACPI_VARIABLE_LENGTH,   /* 0E vendor_short */
 129         ACPI_FIXED_LENGTH,      /* 0F end_tag */
 130
 131         /* Large descriptors */
 132
 133         0,
 134         ACPI_FIXED_LENGTH,      /* 01 Memory24 */
 135         ACPI_FIXED_LENGTH,      /* 02 generic_register */
 136         0,
 137         ACPI_VARIABLE_LENGTH,   /* 04 vendor_long */
 138         ACPI_FIXED_LENGTH,      /* 05 Memory32 */
 139         ACPI_FIXED_LENGTH,      /* 06 memory32_fixed */
 140         ACPI_VARIABLE_LENGTH,   /* 07 Dword* address */
 141         ACPI_VARIABLE_LENGTH,   /* 08 Word* address */
 142         ACPI_VARIABLE_LENGTH,   /* 09 extended_IRQ */
 143         ACPI_VARIABLE_LENGTH,   /* 0A Qword* address */
 144         ACPI_FIXED_LENGTH,      /* 0B Extended* address */
 145         ACPI_VARIABLE_LENGTH,   /* 0C Gpio* */
 146         ACPI_VARIABLE_LENGTH,   /* 0D pin_function */
 147         ACPI_VARIABLE_LENGTH,   /* 0E *serial_bus */
 148         ACPI_VARIABLE_LENGTH,   /* 0F pin_config */
 149         ACPI_VARIABLE_LENGTH,   /* 10 pin_group */
 150         ACPI_VARIABLE_LENGTH,   /* 11 pin_group_function */
 151         ACPI_VARIABLE_LENGTH,   /* 12 pin_group_config */
 152 };
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_ut_walk_aml_resources
 157  *
 158  * PARAMETERS:  walk_state          - Current walk info
 159  * PARAMETERS:  aml                 - Pointer to the raw AML resource template
 160  *              aml_length          - Length of the entire template
 161  *              user_function       - Called once for each descriptor found. If
 162  *                                    NULL, a pointer to the end_tag is returned
 163  *              context             - Passed to user_function
 164  *
 165  * RETURN:      Status
 166  *
 167  * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
 168  *              once for each resource found.
 169  *
 170  ******************************************************************************/
 171
 172 acpi_status
 173 acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
 174                            u8 *aml,
 175                            acpi_size aml_length,
 176                            acpi_walk_aml_callback user_function, void **context)
 177 {
 178         acpi_status status;
 179         u8 *end_aml;
 180         u8 resource_index;
 181         u32 length;
 182         u32 offset = 0;
 183         u8 end_tag[2] = { 0x79, 0x00 };
 184
 185         ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
 186
 187         /* The absolute minimum resource template is one end_tag descriptor */
 188
 189         if (aml_length < sizeof(struct aml_resource_end_tag)) {
 190                 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 191         }
 192
 193         /* Point to the end of the resource template buffer */
 194
 195         end_aml = aml + aml_length;
 196
 197         /* Walk the byte list, abort on any invalid descriptor type or length */
 198
 199         while (aml < end_aml) {
 200
 201                 /* Validate the Resource Type and Resource Length */
 202
 203                 status =
 204                     acpi_ut_validate_resource(walk_state, aml, &resource_index);
 205                 if (ACPI_FAILURE(status)) {
 206                         /*
 207                          * Exit on failure. Cannot continue because the descriptor
 208                          * length may be bogus also.
 209                          */
 210                         return_ACPI_STATUS(status);
 211                 }
 212
 213                 /* Get the length of this descriptor */
 214
 215                 length = acpi_ut_get_descriptor_length(aml);
 216
 217                 /* Invoke the user function */
 218
 219                 if (user_function) {
 220                         status =
 221                             user_function(aml, length, offset, resource_index,
 222                                           context);
 223                         if (ACPI_FAILURE(status)) {
 224                                 return_ACPI_STATUS(status);
 225                         }
 226                 }
 227
 228                 /* An end_tag descriptor terminates this resource template */
 229
 230                 if (acpi_ut_get_resource_type(aml) ==
 231                     ACPI_RESOURCE_NAME_END_TAG) {
 232                         /*
 233                          * There must be at least one more byte in the buffer for
 234                          * the 2nd byte of the end_tag
 235                          */
 236                         if ((aml + 1) >= end_aml) {
 237                                 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 238                         }
 239
 240                         /*
 241                          * Don't attempt to perform any validation on the 2nd byte.
 242                          * Although all known ASL compilers insert a zero for the 2nd
 243                          * byte, it can also be a checksum (as per the ACPI spec),
 244                          * and this is occasionally seen in the field. July 2017.
 245                          */
 246
 247                         /* Return the pointer to the end_tag if requested */
 248
 249                         if (!user_function) {
 250                                 *context = aml;
 251                         }
 252
 253                         /* Normal exit */
 254
 255                         return_ACPI_STATUS(AE_OK);
 256                 }
 257
 258                 aml += length;
 259                 offset += length;
 260         }
 261
 262         /* Did not find an end_tag descriptor */
 263
 264         if (user_function) {
 265
 266                 /* Insert an end_tag anyway. acpi_rs_get_list_length always leaves room */
 267
 268                 (void)acpi_ut_validate_resource(walk_state, end_tag,
 269                                                 &resource_index);
 270                 status =
 271                     user_function(end_tag, 2, offset, resource_index, context);
 272                 if (ACPI_FAILURE(status)) {
 273                         return_ACPI_STATUS(status);
 274                 }
 275         }
 276
 277         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 278 }
 279
 280 /*******************************************************************************
 281  *
 282  * FUNCTION:    acpi_ut_validate_resource
 283  *
 284  * PARAMETERS:  walk_state          - Current walk info
 285  *              aml                 - Pointer to the raw AML resource descriptor
 286  *              return_index        - Where the resource index is returned. NULL
 287  *                                    if the index is not required.
 288  *
 289  * RETURN:      Status, and optionally the Index into the global resource tables
 290  *
 291  * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 292  *              Type and Resource Length. Returns an index into the global
 293  *              resource information/dispatch tables for later use.
 294  *
 295  ******************************************************************************/
 296
 297 acpi_status
 298 acpi_ut_validate_resource(struct acpi_walk_state *walk_state,
 299                           void *aml, u8 *return_index)
 300 {
 301         union aml_resource *aml_resource;
 302         u8 resource_type;
 303         u8 resource_index;
 304         acpi_rs_length resource_length;
 305         acpi_rs_length minimum_resource_length;
 306
 307         ACPI_FUNCTION_ENTRY();
 308
 309         /*
 310          * 1) Validate the resource_type field (Byte 0)
 311          */
 312         resource_type = ACPI_GET8(aml);
 313
 314         /*
 315          * Byte 0 contains the descriptor name (Resource Type)
 316          * Examine the large/small bit in the resource header
 317          */
 318         if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
 319
 320                 /* Verify the large resource type (name) against the max */
 321
 322                 if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
 323                         goto invalid_resource;
 324                 }
 325
 326                 /*
 327                  * Large Resource Type -- bits 6:0 contain the name
 328                  * Translate range 0x80-0x8B to index range 0x10-0x1B
 329                  */
 330                 resource_index = (u8) (resource_type - 0x70);
 331         } else {
 332                 /*
 333                  * Small Resource Type -- bits 6:3 contain the name
 334                  * Shift range to index range 0x00-0x0F
 335                  */
 336                 resource_index = (u8)
 337                     ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
 338         }
 339
 340         /*
 341          * Check validity of the resource type, via acpi_gbl_resource_types.
 342          * Zero indicates an invalid resource.
 343          */
 344         if (!acpi_gbl_resource_types[resource_index]) {
 345                 goto invalid_resource;
 346         }
 347
 348         /*
 349          * Validate the resource_length field. This ensures that the length
 350          * is at least reasonable, and guarantees that it is non-zero.
 351          */
 352         resource_length = acpi_ut_get_resource_length(aml);
 353         minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
 354
 355         /* Validate based upon the type of resource - fixed length or variable */
 356
 357         switch (acpi_gbl_resource_types[resource_index]) {
 358         case ACPI_FIXED_LENGTH:
 359
 360                 /* Fixed length resource, length must match exactly */
 361
 362                 if (resource_length != minimum_resource_length) {
 363                         goto bad_resource_length;
 364                 }
 365                 break;
 366
 367         case ACPI_VARIABLE_LENGTH:
 368
 369                 /* Variable length resource, length must be at least the minimum */
 370
 371                 if (resource_length < minimum_resource_length) {
 372                         goto bad_resource_length;
 373                 }
 374                 break;
 375
 376         case ACPI_SMALL_VARIABLE_LENGTH:
 377
 378                 /* Small variable length resource, length can be (Min) or (Min-1) */
 379
 380                 if ((resource_length > minimum_resource_length) ||
 381                     (resource_length < (minimum_resource_length - 1))) {
 382                         goto bad_resource_length;
 383                 }
 384                 break;
 385
 386         default:
 387
 388                 /* Shouldn't happen (because of validation earlier), but be sure */
 389
 390                 goto invalid_resource;
 391         }
 392
 393         aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
 394         if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) {
 395
 396                 /* Validate the bus_type field */
 397
 398                 if ((aml_resource->common_serial_bus.type == 0) ||
 399                     (aml_resource->common_serial_bus.type >
 400                      AML_RESOURCE_MAX_SERIALBUSTYPE)) {
 401                         if (walk_state) {
 402                                 ACPI_ERROR((AE_INFO,
 403                                             "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
 404                                             aml_resource->common_serial_bus.
 405                                             type));
 406                         }
 407                         return (AE_AML_INVALID_RESOURCE_TYPE);
 408                 }
 409         }
 410
 411         /* Optionally return the resource table index */
 412
 413         if (return_index) {
 414                 *return_index = resource_index;
 415         }
 416
 417         return (AE_OK);
 418
 419 invalid_resource:
 420
 421         if (walk_state) {
 422                 ACPI_ERROR((AE_INFO,
 423                             "Invalid/unsupported resource descriptor: Type 0x%2.2X",
 424                             resource_type));
 425         }
 426         return (AE_AML_INVALID_RESOURCE_TYPE);
 427
 428 bad_resource_length:
 429
 430         if (walk_state) {
 431                 ACPI_ERROR((AE_INFO,
 432                             "Invalid resource descriptor length: Type "
 433                             "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
 434                             resource_type, resource_length,
 435                             minimum_resource_length));
 436         }
 437         return (AE_AML_BAD_RESOURCE_LENGTH);
 438 }
 439
 440 /*******************************************************************************
 441  *
 442  * FUNCTION:    acpi_ut_get_resource_type
 443  *
 444  * PARAMETERS:  aml             - Pointer to the raw AML resource descriptor
 445  *
 446  * RETURN:      The Resource Type with no extraneous bits (except the
 447  *              Large/Small descriptor bit -- this is left alone)
 448  *
 449  * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 450  *              a resource descriptor.
 451  *
 452  ******************************************************************************/
 453
 454 u8 acpi_ut_get_resource_type(void *aml)
 455 {
 456         ACPI_FUNCTION_ENTRY();
 457
 458         /*
 459          * Byte 0 contains the descriptor name (Resource Type)
 460          * Examine the large/small bit in the resource header
 461          */
 462         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 463
 464                 /* Large Resource Type -- bits 6:0 contain the name */
 465
 466                 return (ACPI_GET8(aml));
 467         } else {
 468                 /* Small Resource Type -- bits 6:3 contain the name */
 469
 470                 return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
 471         }
 472 }
 473
 474 /*******************************************************************************
 475  *
 476  * FUNCTION:    acpi_ut_get_resource_length
 477  *
 478  * PARAMETERS:  aml             - Pointer to the raw AML resource descriptor
 479  *
 480  * RETURN:      Byte Length
 481  *
 482  * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 483  *              definition, this does not include the size of the descriptor
 484  *              header or the length field itself.
 485  *
 486  ******************************************************************************/
 487
 488 u16 acpi_ut_get_resource_length(void *aml)
 489 {
 490         acpi_rs_length resource_length;
 491
 492         ACPI_FUNCTION_ENTRY();
 493
 494         /*
 495          * Byte 0 contains the descriptor name (Resource Type)
 496          * Examine the large/small bit in the resource header
 497          */
 498         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 499
 500                 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
 501
 502                 ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
 503
 504         } else {
 505                 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
 506
 507                 resource_length = (u16) (ACPI_GET8(aml) &
 508                                          ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
 509         }
 510
 511         return (resource_length);
 512 }
 513
 514 /*******************************************************************************
 515  *
 516  * FUNCTION:    acpi_ut_get_resource_header_length
 517  *
 518  * PARAMETERS:  aml             - Pointer to the raw AML resource descriptor
 519  *
 520  * RETURN:      Length of the AML header (depends on large/small descriptor)
 521  *
 522  * DESCRIPTION: Get the length of the header for this resource.
 523  *
 524  ******************************************************************************/
 525
 526 u8 acpi_ut_get_resource_header_length(void *aml)
 527 {
 528         ACPI_FUNCTION_ENTRY();
 529
 530         /* Examine the large/small bit in the resource header */
 531
 532         if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
 533                 return (sizeof(struct aml_resource_large_header));
 534         } else {
 535                 return (sizeof(struct aml_resource_small_header));
 536         }
 537 }
 538
 539 /*******************************************************************************
 540  *
 541  * FUNCTION:    acpi_ut_get_descriptor_length
 542  *
 543  * PARAMETERS:  aml             - Pointer to the raw AML resource descriptor
 544  *
 545  * RETURN:      Byte length
 546  *
 547  * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 548  *              length of the descriptor header and the length field itself.
 549  *              Used to walk descriptor lists.
 550  *
 551  ******************************************************************************/
 552
 553 u32 acpi_ut_get_descriptor_length(void *aml)
 554 {
 555         ACPI_FUNCTION_ENTRY();
 556
 557         /*
 558          * Get the Resource Length (does not include header length) and add
 559          * the header length (depends on if this is a small or large resource)
 560          */
 561         return (acpi_ut_get_resource_length(aml) +
 562                 acpi_ut_get_resource_header_length(aml));
 563 }
 564
 565 /*******************************************************************************
 566  *
 567  * FUNCTION:    acpi_ut_get_resource_end_tag
 568  *
 569  * PARAMETERS:  obj_desc        - The resource template buffer object
 570  *              end_tag         - Where the pointer to the end_tag is returned
 571  *
 572  * RETURN:      Status, pointer to the end tag
 573  *
 574  * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 575  *              Note: allows a buffer length of zero.
 576  *
 577  ******************************************************************************/
 578
 579 acpi_status
 580 acpi_ut_get_resource_end_tag(union acpi_operand_object *obj_desc, u8 **end_tag)
 581 {
 582         acpi_status status;
 583
 584         ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
 585
 586         /* Allow a buffer length of zero */
 587
 588         if (!obj_desc->buffer.length) {
 589                 *end_tag = obj_desc->buffer.pointer;
 590                 return_ACPI_STATUS(AE_OK);
 591         }
 592
 593         /* Validate the template and get a pointer to the end_tag */
 594
 595         status = acpi_ut_walk_aml_resources(NULL, obj_desc->buffer.pointer,
 596                                             obj_desc->buffer.length, NULL,
 597                                             (void **)end_tag);
 598
 599         return_ACPI_STATUS(status);
 600 }