drivers/acpi/acpica/nsxfname.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsxfname - Public interfaces to the ACPI subsystem
   4  *                         ACPI Namespace oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2016, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #define EXPORT_ACPI_INTERFACES
  46
  47 #include <acpi/acpi.h>
  48 #include "accommon.h"
  49 #include "acnamesp.h"
  50 #include "acparser.h"
  51 #include "amlcode.h"
  52
  53 #define _COMPONENT          ACPI_NAMESPACE
  54 ACPI_MODULE_NAME("nsxfname")
  55
  56 /* Local prototypes */
  57 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
  58                                     struct acpi_pnp_device_id *source,
  59                                     char *string_area);
  60
  61 /******************************************************************************
  62  *
  63  * FUNCTION:    acpi_get_handle
  64  *
  65  * PARAMETERS:  parent          - Object to search under (search scope).
  66  *              pathname        - Pointer to an asciiz string containing the
  67  *                                name
  68  *              ret_handle      - Where the return handle is returned
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: This routine will search for a caller specified name in the
  73  *              name space. The caller can restrict the search region by
  74  *              specifying a non NULL parent. The parent value is itself a
  75  *              namespace handle.
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_get_handle(acpi_handle parent,
  81                 acpi_string pathname, acpi_handle *ret_handle)
  82 {
  83         acpi_status status;
  84         struct acpi_namespace_node *node = NULL;
  85         struct acpi_namespace_node *prefix_node = NULL;
  86
  87         ACPI_FUNCTION_ENTRY();
  88
  89         /* Parameter Validation */
  90
  91         if (!ret_handle || !pathname) {
  92                 return (AE_BAD_PARAMETER);
  93         }
  94
  95         /* Convert a parent handle to a prefix node */
  96
  97         if (parent) {
  98                 prefix_node = acpi_ns_validate_handle(parent);
  99                 if (!prefix_node) {
 100                         return (AE_BAD_PARAMETER);
 101                 }
 102         }
 103
 104         /*
 105          * Valid cases are:
 106          * 1) Fully qualified pathname
 107          * 2) Parent + Relative pathname
 108          *
 109          * Error for <null Parent + relative path>
 110          */
 111         if (ACPI_IS_ROOT_PREFIX(pathname[0])) {
 112
 113                 /* Pathname is fully qualified (starts with '\') */
 114
 115                 /* Special case for root-only, since we can't search for it */
 116
 117                 if (!strcmp(pathname, ACPI_NS_ROOT_PATH)) {
 118                         *ret_handle =
 119                             ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
 120                         return (AE_OK);
 121                 }
 122         } else if (!prefix_node) {
 123
 124                 /* Relative path with null prefix is disallowed */
 125
 126                 return (AE_BAD_PARAMETER);
 127         }
 128
 129         /* Find the Node and convert to a handle */
 130
 131         status =
 132             acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 133         if (ACPI_SUCCESS(status)) {
 134                 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 135         }
 136
 137         return (status);
 138 }
 139
 140 ACPI_EXPORT_SYMBOL(acpi_get_handle)
 141
 142 /******************************************************************************
 143  *
 144  * FUNCTION:    acpi_get_name
 145  *
 146  * PARAMETERS:  handle          - Handle to be converted to a pathname
 147  *              name_type       - Full pathname or single segment
 148  *              buffer          - Buffer for returned path
 149  *
 150  * RETURN:      Pointer to a string containing the fully qualified Name.
 151  *
 152  * DESCRIPTION: This routine returns the fully qualified name associated with
 153  *              the Handle parameter. This and the acpi_pathname_to_handle are
 154  *              complementary functions.
 155  *
 156  ******************************************************************************/
 157 acpi_status
 158 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer *buffer)
 159 {
 160         acpi_status status;
 161
 162         /* Parameter validation */
 163
 164         if (name_type > ACPI_NAME_TYPE_MAX) {
 165                 return (AE_BAD_PARAMETER);
 166         }
 167
 168         status = acpi_ut_validate_buffer(buffer);
 169         if (ACPI_FAILURE(status)) {
 170                 return (status);
 171         }
 172
 173         /*
 174          * Wants the single segment ACPI name.
 175          * Validate handle and convert to a namespace Node
 176          */
 177         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 178         if (ACPI_FAILURE(status)) {
 179                 return (status);
 180         }
 181
 182         if (name_type == ACPI_FULL_PATHNAME ||
 183             name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {
 184
 185                 /* Get the full pathname (From the namespace root) */
 186
 187                 status = acpi_ns_handle_to_pathname(handle, buffer,
 188                                                     name_type ==
 189                                                     ACPI_FULL_PATHNAME ? FALSE :
 190                                                     TRUE);
 191         } else {
 192                 /* Get the single name */
 193
 194                 status = acpi_ns_handle_to_name(handle, buffer);
 195         }
 196
 197         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 198         return (status);
 199 }
 200
 201 ACPI_EXPORT_SYMBOL(acpi_get_name)
 202
 203 /******************************************************************************
 204  *
 205  * FUNCTION:    acpi_ns_copy_device_id
 206  *
 207  * PARAMETERS:  dest                - Pointer to the destination PNP_DEVICE_ID
 208  *              source              - Pointer to the source PNP_DEVICE_ID
 209  *              string_area         - Pointer to where to copy the dest string
 210  *
 211  * RETURN:      Pointer to the next string area
 212  *
 213  * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
 214  *
 215  ******************************************************************************/
 216 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
 217                                     struct acpi_pnp_device_id *source,
 218                                     char *string_area)
 219 {
 220         /* Create the destination PNP_DEVICE_ID */
 221
 222         dest->string = string_area;
 223         dest->length = source->length;
 224
 225         /* Copy actual string and return a pointer to the next string area */
 226
 227         memcpy(string_area, source->string, source->length);
 228         return (string_area + source->length);
 229 }
 230
 231 /******************************************************************************
 232  *
 233  * FUNCTION:    acpi_get_object_info
 234  *
 235  * PARAMETERS:  handle              - Object Handle
 236  *              return_buffer       - Where the info is returned
 237  *
 238  * RETURN:      Status
 239  *
 240  * DESCRIPTION: Returns information about an object as gleaned from the
 241  *              namespace node and possibly by running several standard
 242  *              control methods (Such as in the case of a device.)
 243  *
 244  * For Device and Processor objects, run the Device _HID, _UID, _CID, _STA,
 245  * _CLS, _ADR, _sx_w, and _sx_d methods.
 246  *
 247  * Note: Allocates the return buffer, must be freed by the caller.
 248  *
 249  * Note: This interface is intended to be used during the initial device
 250  * discovery namespace traversal. Therefore, no complex methods can be
 251  * executed, especially those that access operation regions. Therefore, do
 252  * not add any additional methods that could cause problems in this area.
 253  * this was the fate of the _SUB method which was found to cause such
 254  * problems and was removed (11/2015).
 255  *
 256  ******************************************************************************/
 257
 258 acpi_status
 259 acpi_get_object_info(acpi_handle handle,
 260                      struct acpi_device_info **return_buffer)
 261 {
 262         struct acpi_namespace_node *node;
 263         struct acpi_device_info *info;
 264         struct acpi_pnp_device_id_list *cid_list = NULL;
 265         struct acpi_pnp_device_id *hid = NULL;
 266         struct acpi_pnp_device_id *uid = NULL;
 267         struct acpi_pnp_device_id *cls = NULL;
 268         char *next_id_string;
 269         acpi_object_type type;
 270         acpi_name name;
 271         u8 param_count = 0;
 272         u16 valid = 0;
 273         u32 info_size;
 274         u32 i;
 275         acpi_status status;
 276
 277         /* Parameter validation */
 278
 279         if (!handle || !return_buffer) {
 280                 return (AE_BAD_PARAMETER);
 281         }
 282
 283         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 284         if (ACPI_FAILURE(status)) {
 285                 return (status);
 286         }
 287
 288         node = acpi_ns_validate_handle(handle);
 289         if (!node) {
 290                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 291                 return (AE_BAD_PARAMETER);
 292         }
 293
 294         /* Get the namespace node data while the namespace is locked */
 295
 296         info_size = sizeof(struct acpi_device_info);
 297         type = node->type;
 298         name = node->name.integer;
 299
 300         if (node->type == ACPI_TYPE_METHOD) {
 301                 param_count = node->object->method.param_count;
 302         }
 303
 304         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 305         if (ACPI_FAILURE(status)) {
 306                 return (status);
 307         }
 308
 309         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 310                 /*
 311                  * Get extra info for ACPI Device/Processor objects only:
 312                  * Run the Device _HID, _UID, _CLS, and _CID methods.
 313                  *
 314                  * Note: none of these methods are required, so they may or may
 315                  * not be present for this device. The Info->Valid bitfield is used
 316                  * to indicate which methods were found and run successfully.
 317                  */
 318
 319                 /* Execute the Device._HID method */
 320
 321                 status = acpi_ut_execute_HID(node, &hid);
 322                 if (ACPI_SUCCESS(status)) {
 323                         info_size += hid->length;
 324                         valid |= ACPI_VALID_HID;
 325                 }
 326
 327                 /* Execute the Device._UID method */
 328
 329                 status = acpi_ut_execute_UID(node, &uid);
 330                 if (ACPI_SUCCESS(status)) {
 331                         info_size += uid->length;
 332                         valid |= ACPI_VALID_UID;
 333                 }
 334
 335                 /* Execute the Device._CID method */
 336
 337                 status = acpi_ut_execute_CID(node, &cid_list);
 338                 if (ACPI_SUCCESS(status)) {
 339
 340                         /* Add size of CID strings and CID pointer array */
 341
 342                         info_size +=
 343                             (cid_list->list_size -
 344                              sizeof(struct acpi_pnp_device_id_list));
 345                         valid |= ACPI_VALID_CID;
 346                 }
 347
 348                 /* Execute the Device._CLS method */
 349
 350                 status = acpi_ut_execute_CLS(node, &cls);
 351                 if (ACPI_SUCCESS(status)) {
 352                         info_size += cls->length;
 353                         valid |= ACPI_VALID_CLS;
 354                 }
 355         }
 356
 357         /*
 358          * Now that we have the variable-length data, we can allocate the
 359          * return buffer
 360          */
 361         info = ACPI_ALLOCATE_ZEROED(info_size);
 362         if (!info) {
 363                 status = AE_NO_MEMORY;
 364                 goto cleanup;
 365         }
 366
 367         /* Get the fixed-length data */
 368
 369         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 370                 /*
 371                  * Get extra info for ACPI Device/Processor objects only:
 372                  * Run the _STA, _ADR and, sx_w, and _sx_d methods.
 373                  *
 374                  * Notes: none of these methods are required, so they may or may
 375                  * not be present for this device. The Info->Valid bitfield is used
 376                  * to indicate which methods were found and run successfully.
 377                  *
 378                  * For _STA, if the method does not exist, then (as per the ACPI
 379                  * specification), the returned current_status flags will indicate
 380                  * that the device is present/functional/enabled. Otherwise, the
 381                  * current_status flags reflect the value returned from _STA.
 382                  */
 383
 384                 /* Execute the Device._STA method */
 385
 386                 status = acpi_ut_execute_STA(node, &info->current_status);
 387                 if (ACPI_SUCCESS(status)) {
 388                         valid |= ACPI_VALID_STA;
 389                 }
 390
 391                 /* Execute the Device._ADR method */
 392
 393                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 394                                                          &info->address);
 395                 if (ACPI_SUCCESS(status)) {
 396                         valid |= ACPI_VALID_ADR;
 397                 }
 398
 399                 /* Execute the Device._sx_w methods */
 400
 401                 status = acpi_ut_execute_power_methods(node,
 402                                                        acpi_gbl_lowest_dstate_names,
 403                                                        ACPI_NUM_sx_w_METHODS,
 404                                                        info->lowest_dstates);
 405                 if (ACPI_SUCCESS(status)) {
 406                         valid |= ACPI_VALID_SXWS;
 407                 }
 408
 409                 /* Execute the Device._sx_d methods */
 410
 411                 status = acpi_ut_execute_power_methods(node,
 412                                                        acpi_gbl_highest_dstate_names,
 413                                                        ACPI_NUM_sx_d_METHODS,
 414                                                        info->highest_dstates);
 415                 if (ACPI_SUCCESS(status)) {
 416                         valid |= ACPI_VALID_SXDS;
 417                 }
 418         }
 419
 420         /*
 421          * Create a pointer to the string area of the return buffer.
 422          * Point to the end of the base struct acpi_device_info structure.
 423          */
 424         next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
 425         if (cid_list) {
 426
 427                 /* Point past the CID PNP_DEVICE_ID array */
 428
 429                 next_id_string +=
 430                     ((acpi_size)cid_list->count *
 431                      sizeof(struct acpi_pnp_device_id));
 432         }
 433
 434         /*
 435          * Copy the HID, UID, and CIDs to the return buffer. The variable-length
 436          * strings are copied to the reserved area at the end of the buffer.
 437          *
 438          * For HID and CID, check if the ID is a PCI Root Bridge.
 439          */
 440         if (hid) {
 441                 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
 442                                                         hid, next_id_string);
 443
 444                 if (acpi_ut_is_pci_root_bridge(hid->string)) {
 445                         info->flags |= ACPI_PCI_ROOT_BRIDGE;
 446                 }
 447         }
 448
 449         if (uid) {
 450                 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
 451                                                         uid, next_id_string);
 452         }
 453
 454         if (cid_list) {
 455                 info->compatible_id_list.count = cid_list->count;
 456                 info->compatible_id_list.list_size = cid_list->list_size;
 457
 458                 /* Copy each CID */
 459
 460                 for (i = 0; i < cid_list->count; i++) {
 461                         next_id_string =
 462                             acpi_ns_copy_device_id(&info->compatible_id_list.
 463                                                    ids[i], &cid_list->ids[i],
 464                                                    next_id_string);
 465
 466                         if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
 467                                 info->flags |= ACPI_PCI_ROOT_BRIDGE;
 468                         }
 469                 }
 470         }
 471
 472         if (cls) {
 473                 next_id_string = acpi_ns_copy_device_id(&info->class_code,
 474                                                         cls, next_id_string);
 475         }
 476
 477         /* Copy the fixed-length data */
 478
 479         info->info_size = info_size;
 480         info->type = type;
 481         info->name = name;
 482         info->param_count = param_count;
 483         info->valid = valid;
 484
 485         *return_buffer = info;
 486         status = AE_OK;
 487
 488 cleanup:
 489         if (hid) {
 490                 ACPI_FREE(hid);
 491         }
 492         if (uid) {
 493                 ACPI_FREE(uid);
 494         }
 495         if (cid_list) {
 496                 ACPI_FREE(cid_list);
 497         }
 498         if (cls) {
 499                 ACPI_FREE(cls);
 500         }
 501         return (status);
 502 }
 503
 504 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
 505
 506 /******************************************************************************
 507  *
 508  * FUNCTION:    acpi_install_method
 509  *
 510  * PARAMETERS:  buffer         - An ACPI table containing one control method
 511  *
 512  * RETURN:      Status
 513  *
 514  * DESCRIPTION: Install a control method into the namespace. If the method
 515  *              name already exists in the namespace, it is overwritten. The
 516  *              input buffer must contain a valid DSDT or SSDT containing a
 517  *              single control method.
 518  *
 519  ******************************************************************************/
 520 acpi_status acpi_install_method(u8 *buffer)
 521 {
 522         struct acpi_table_header *table =
 523             ACPI_CAST_PTR(struct acpi_table_header, buffer);
 524         u8 *aml_buffer;
 525         u8 *aml_start;
 526         char *path;
 527         struct acpi_namespace_node *node;
 528         union acpi_operand_object *method_obj;
 529         struct acpi_parse_state parser_state;
 530         u32 aml_length;
 531         u16 opcode;
 532         u8 method_flags;
 533         acpi_status status;
 534
 535         /* Parameter validation */
 536
 537         if (!buffer) {
 538                 return (AE_BAD_PARAMETER);
 539         }
 540
 541         /* Table must be a DSDT or SSDT */
 542
 543         if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
 544             !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 545                 return (AE_BAD_HEADER);
 546         }
 547
 548         /* First AML opcode in the table must be a control method */
 549
 550         parser_state.aml = buffer + sizeof(struct acpi_table_header);
 551         opcode = acpi_ps_peek_opcode(&parser_state);
 552         if (opcode != AML_METHOD_OP) {
 553                 return (AE_BAD_PARAMETER);
 554         }
 555
 556         /* Extract method information from the raw AML */
 557
 558         parser_state.aml += acpi_ps_get_opcode_size(opcode);
 559         parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
 560         path = acpi_ps_get_next_namestring(&parser_state);
 561
 562         method_flags = *parser_state.aml++;
 563         aml_start = parser_state.aml;
 564         aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
 565
 566         /*
 567          * Allocate resources up-front. We don't want to have to delete a new
 568          * node from the namespace if we cannot allocate memory.
 569          */
 570         aml_buffer = ACPI_ALLOCATE(aml_length);
 571         if (!aml_buffer) {
 572                 return (AE_NO_MEMORY);
 573         }
 574
 575         method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 576         if (!method_obj) {
 577                 ACPI_FREE(aml_buffer);
 578                 return (AE_NO_MEMORY);
 579         }
 580
 581         /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
 582
 583         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 584         if (ACPI_FAILURE(status)) {
 585                 goto error_exit;
 586         }
 587
 588         /* The lookup either returns an existing node or creates a new one */
 589
 590         status =
 591             acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
 592                            ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
 593                            NULL, &node);
 594
 595         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 596
 597         if (ACPI_FAILURE(status)) {     /* ns_lookup */
 598                 if (status != AE_ALREADY_EXISTS) {
 599                         goto error_exit;
 600                 }
 601
 602                 /* Node existed previously, make sure it is a method node */
 603
 604                 if (node->type != ACPI_TYPE_METHOD) {
 605                         status = AE_TYPE;
 606                         goto error_exit;
 607                 }
 608         }
 609
 610         /* Copy the method AML to the local buffer */
 611
 612         memcpy(aml_buffer, aml_start, aml_length);
 613
 614         /* Initialize the method object with the new method's information */
 615
 616         method_obj->method.aml_start = aml_buffer;
 617         method_obj->method.aml_length = aml_length;
 618
 619         method_obj->method.param_count = (u8)
 620             (method_flags & AML_METHOD_ARG_COUNT);
 621
 622         if (method_flags & AML_METHOD_SERIALIZED) {
 623                 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
 624
 625                 method_obj->method.sync_level = (u8)
 626                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 627         }
 628
 629         /*
 630          * Now that it is complete, we can attach the new method object to
 631          * the method Node (detaches/deletes any existing object)
 632          */
 633         status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
 634
 635         /*
 636          * Flag indicates AML buffer is dynamic, must be deleted later.
 637          * Must be set only after attach above.
 638          */
 639         node->flags |= ANOBJ_ALLOCATED_BUFFER;
 640
 641         /* Remove local reference to the method object */
 642
 643         acpi_ut_remove_reference(method_obj);
 644         return (status);
 645
 646 error_exit:
 647
 648         ACPI_FREE(aml_buffer);
 649         ACPI_FREE(method_obj);
 650         return (status);
 651 }
 652 ACPI_EXPORT_SYMBOL(acpi_install_method)