LXR linux/drivers/acpi/acpica/rscreate.c

   1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2/*******************************************************************************
   3 *
   4 * Module Name: rscreate - Create resource lists/tables
   5 *
   6 ******************************************************************************/
   7
   8#include <acpi/acpi.h>
   9#include "accommon.h"
  10#include "acresrc.h"
  11#include "acnamesp.h"
  12
  13#define _COMPONENT          ACPI_RESOURCES
  14ACPI_MODULE_NAME("rscreate")
  15
  16/*******************************************************************************
  17 *
  18 * FUNCTION:    acpi_buffer_to_resource
  19 *
  20 * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
  21 *              aml_buffer_length   - Length of the aml_buffer
  22 *              resource_ptr        - Where the converted resource is returned
  23 *
  24 * RETURN:      Status
  25 *
  26 * DESCRIPTION: Convert a raw AML buffer to a resource list
  27 *
  28 ******************************************************************************/
  29acpi_status
  30acpi_buffer_to_resource(u8 *aml_buffer,
  31                        u16 aml_buffer_length,
  32                        struct acpi_resource **resource_ptr)
  33{
  34        acpi_status status;
  35        acpi_size list_size_needed;
  36        void *resource;
  37        void *current_resource_ptr;
  38
  39        ACPI_FUNCTION_TRACE(acpi_buffer_to_resource);
  40
  41        /*
  42         * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
  43         * is not required here.
  44         */
  45
  46        /* Get the required length for the converted resource */
  47
  48        status =
  49            acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
  50                                    &list_size_needed);
  51        if (status == AE_AML_NO_RESOURCE_END_TAG) {
  52                status = AE_OK;
  53        }
  54        if (ACPI_FAILURE(status)) {
  55                return_ACPI_STATUS(status);
  56        }
  57
  58        /* Allocate a buffer for the converted resource */
  59
  60        resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
  61        current_resource_ptr = resource;
  62        if (!resource) {
  63                return_ACPI_STATUS(AE_NO_MEMORY);
  64        }
  65
  66        /* Perform the AML-to-Resource conversion */
  67
  68        status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length,
  69                                            acpi_rs_convert_aml_to_resources,
  70                                            &current_resource_ptr);
  71        if (status == AE_AML_NO_RESOURCE_END_TAG) {
  72                status = AE_OK;
  73        }
  74        if (ACPI_FAILURE(status)) {
  75                ACPI_FREE(resource);
  76        } else {
  77                *resource_ptr = resource;
  78        }
  79
  80        return_ACPI_STATUS(status);
  81}
  82
  83ACPI_EXPORT_SYMBOL(acpi_buffer_to_resource)
  84
  85/*******************************************************************************
  86 *
  87 * FUNCTION:    acpi_rs_create_resource_list
  88 *
  89 * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
  90 *              output_buffer       - Pointer to the user's buffer
  91 *
  92 * RETURN:      Status: AE_OK if okay, else a valid acpi_status code
  93 *              If output_buffer is not large enough, output_buffer_length
  94 *              indicates how large output_buffer should be, else it
  95 *              indicates how may u8 elements of output_buffer are valid.
  96 *
  97 * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
  98 *              execution and parses the stream to create a linked list
  99 *              of device resources.
 100 *
 101 ******************************************************************************/
 102acpi_status
 103acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
 104                             struct acpi_buffer *output_buffer)
 105{
 106
 107        acpi_status status;
 108        u8 *aml_start;
 109        acpi_size list_size_needed = 0;
 110        u32 aml_buffer_length;
 111        void *resource;
 112
 113        ACPI_FUNCTION_TRACE(rs_create_resource_list);
 114
 115        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
 116
 117        /* Params already validated, so we don't re-validate here */
 118
 119        aml_buffer_length = aml_buffer->buffer.length;
 120        aml_start = aml_buffer->buffer.pointer;
 121
 122        /*
 123         * Pass the aml_buffer into a module that can calculate
 124         * the buffer size needed for the linked list
 125         */
 126        status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
 127                                         &list_size_needed);
 128
 129        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
 130                          status, (u32) list_size_needed));
 131        if (ACPI_FAILURE(status)) {
 132                return_ACPI_STATUS(status);
 133        }
 134
 135        /* Validate/Allocate/Clear caller buffer */
 136
 137        status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 138        if (ACPI_FAILURE(status)) {
 139                return_ACPI_STATUS(status);
 140        }
 141
 142        /* Do the conversion */
 143
 144        resource = output_buffer->pointer;
 145        status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length,
 146                                            acpi_rs_convert_aml_to_resources,
 147                                            &resource);
 148        if (ACPI_FAILURE(status)) {
 149                return_ACPI_STATUS(status);
 150        }
 151
 152        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 153                          output_buffer->pointer, (u32) output_buffer->length));
 154        return_ACPI_STATUS(AE_OK);
 155}
 156
 157/*******************************************************************************
 158 *
 159 * FUNCTION:    acpi_rs_create_pci_routing_table
 160 *
 161 * PARAMETERS:  package_object          - Pointer to a package containing one
 162 *                                        of more ACPI_OPERAND_OBJECTs
 163 *              output_buffer           - Pointer to the user's buffer
 164 *
 165 * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 166 *              If the output_buffer is too small, the error will be
 167 *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 168 *              to the size buffer needed.
 169 *
 170 * DESCRIPTION: Takes the union acpi_operand_object package and creates a
 171 *              linked list of PCI interrupt descriptions
 172 *
 173 * NOTE: It is the caller's responsibility to ensure that the start of the
 174 * output buffer is aligned properly (if necessary).
 175 *
 176 ******************************************************************************/
 177
 178acpi_status
 179acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 180                                 struct acpi_buffer *output_buffer)
 181{
 182        u8 *buffer;
 183        union acpi_operand_object **top_object_list;
 184        union acpi_operand_object **sub_object_list;
 185        union acpi_operand_object *obj_desc;
 186        acpi_size buffer_size_needed = 0;
 187        u32 number_of_elements;
 188        u32 index;
 189        struct acpi_pci_routing_table *user_prt;
 190        struct acpi_namespace_node *node;
 191        acpi_status status;
 192        struct acpi_buffer path_buffer;
 193
 194        ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
 195
 196        /* Params already validated, so we don't re-validate here */
 197
 198        /* Get the required buffer length */
 199
 200        status =
 201            acpi_rs_get_pci_routing_table_length(package_object,
 202                                                 &buffer_size_needed);
 203        if (ACPI_FAILURE(status)) {
 204                return_ACPI_STATUS(status);
 205        }
 206
 207        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
 208                          (u32) buffer_size_needed));
 209
 210        /* Validate/Allocate/Clear caller buffer */
 211
 212        status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 213        if (ACPI_FAILURE(status)) {
 214                return_ACPI_STATUS(status);
 215        }
 216
 217        /*
 218         * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
 219         * package that in turn contains an u64 Address, a u8 Pin,
 220         * a Name, and a u8 source_index.
 221         */
 222        top_object_list = package_object->package.elements;
 223        number_of_elements = package_object->package.count;
 224        buffer = output_buffer->pointer;
 225        user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 226
 227        for (index = 0; index < number_of_elements; index++) {
 228
 229                /*
 230                 * Point user_prt past this current structure
 231                 *
 232                 * NOTE: On the first iteration, user_prt->Length will
 233                 * be zero because we cleared the return buffer earlier
 234                 */
 235                buffer += user_prt->length;
 236                user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 237
 238                /*
 239                 * Fill in the Length field with the information we have at this
 240                 * point. The minus four is to subtract the size of the u8
 241                 * Source[4] member because it is added below.
 242                 */
 243                user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 244
 245                /* Each subpackage must be of length 4 */
 246
 247                if ((*top_object_list)->package.count != 4) {
 248                        ACPI_ERROR((AE_INFO,
 249                                    "(PRT[%u]) Need package of length 4, found length %u",
 250                                    index, (*top_object_list)->package.count));
 251                        return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 252                }
 253
 254                /*
 255                 * Dereference the subpackage.
 256                 * The sub_object_list will now point to an array of the four IRQ
 257                 * elements: [Address, Pin, Source, source_index]
 258                 */
 259                sub_object_list = (*top_object_list)->package.elements;
 260
 261                /* 1) First subobject: Dereference the PRT.Address */
 262
 263                obj_desc = sub_object_list[0];
 264                if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
 265                        ACPI_ERROR((AE_INFO,
 266                                    "(PRT[%u].Address) Need Integer, found %s",
 267                                    index,
 268                                    acpi_ut_get_object_type_name(obj_desc)));
 269                        return_ACPI_STATUS(AE_BAD_DATA);
 270                }
 271
 272                user_prt->address = obj_desc->integer.value;
 273
 274                /* 2) Second subobject: Dereference the PRT.Pin */
 275
 276                obj_desc = sub_object_list[1];
 277                if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
 278                        ACPI_ERROR((AE_INFO,
 279                                    "(PRT[%u].Pin) Need Integer, found %s",
 280                                    index,
 281                                    acpi_ut_get_object_type_name(obj_desc)));
 282                        return_ACPI_STATUS(AE_BAD_DATA);
 283                }
 284
 285                user_prt->pin = (u32) obj_desc->integer.value;
 286
 287                /*
 288                 * 3) Third subobject: Dereference the PRT.source_name
 289                 * The name may be unresolved (slack mode), so allow a null object
 290                 */
 291                obj_desc = sub_object_list[2];
 292                if (obj_desc) {
 293                        switch (obj_desc->common.type) {
 294                        case ACPI_TYPE_LOCAL_REFERENCE:
 295
 296                                if (obj_desc->reference.class !=
 297                                    ACPI_REFCLASS_NAME) {
 298                                        ACPI_ERROR((AE_INFO,
 299                                                    "(PRT[%u].Source) Need name, found Reference Class 0x%X",
 300                                                    index,
 301                                                    obj_desc->reference.class));
 302                                        return_ACPI_STATUS(AE_BAD_DATA);
 303                                }
 304
 305                                node = obj_desc->reference.node;
 306
 307                                /* Use *remaining* length of the buffer as max for pathname */
 308
 309                                path_buffer.length = output_buffer->length -
 310                                    (u32) ((u8 *) user_prt->source -
 311                                           (u8 *) output_buffer->pointer);
 312                                path_buffer.pointer = user_prt->source;
 313
 314                                status = acpi_ns_handle_to_pathname((acpi_handle)node, &path_buffer, FALSE);
 315
 316                                /* +1 to include null terminator */
 317
 318                                user_prt->length +=
 319                                    (u32)strlen(user_prt->source) + 1;
 320                                break;
 321
 322                        case ACPI_TYPE_STRING:
 323
 324                                strcpy(user_prt->source,
 325                                       obj_desc->string.pointer);
 326
 327                                /*
 328                                 * Add to the Length field the length of the string
 329                                 * (add 1 for terminator)
 330                                 */
 331                                user_prt->length += obj_desc->string.length + 1;
 332                                break;
 333
 334                        case ACPI_TYPE_INTEGER:
 335                                /*
 336                                 * If this is a number, then the Source Name is NULL, since
 337                                 * the entire buffer was zeroed out, we can leave this alone.
 338                                 *
 339                                 * Add to the Length field the length of the u32 NULL
 340                                 */
 341                                user_prt->length += sizeof(u32);
 342                                break;
 343
 344                        default:
 345
 346                                ACPI_ERROR((AE_INFO,
 347                                            "(PRT[%u].Source) Need Ref/String/Integer, found %s",
 348                                            index,
 349                                            acpi_ut_get_object_type_name
 350                                            (obj_desc)));
 351                                return_ACPI_STATUS(AE_BAD_DATA);
 352                        }
 353                }
 354
 355                /* Now align the current length */
 356
 357                user_prt->length =
 358                    (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
 359
 360                /* 4) Fourth subobject: Dereference the PRT.source_index */
 361
 362                obj_desc = sub_object_list[3];
 363                if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
 364                        ACPI_ERROR((AE_INFO,
 365                                    "(PRT[%u].SourceIndex) Need Integer, found %s",
 366                                    index,
 367                                    acpi_ut_get_object_type_name(obj_desc)));
 368                        return_ACPI_STATUS(AE_BAD_DATA);
 369                }
 370
 371                user_prt->source_index = (u32) obj_desc->integer.value;
 372
 373                /* Point to the next union acpi_operand_object in the top level package */
 374
 375                top_object_list++;
 376        }
 377
 378        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 379                          output_buffer->pointer, (u32) output_buffer->length));
 380        return_ACPI_STATUS(AE_OK);
 381}
 382
 383/*******************************************************************************
 384 *
 385 * FUNCTION:    acpi_rs_create_aml_resources
 386 *
 387 * PARAMETERS:  resource_list           - Pointer to the resource list buffer
 388 *              output_buffer           - Where the AML buffer is returned
 389 *
 390 * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 391 *              If the output_buffer is too small, the error will be
 392 *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 393 *              to the size buffer needed.
 394 *
 395 * DESCRIPTION: Converts a list of device resources to an AML bytestream
 396 *              to be used as input for the _SRS control method.
 397 *
 398 ******************************************************************************/
 399
 400acpi_status
 401acpi_rs_create_aml_resources(struct acpi_buffer *resource_list,
 402                             struct acpi_buffer *output_buffer)
 403{
 404        acpi_status status;
 405        acpi_size aml_size_needed = 0;
 406
 407        ACPI_FUNCTION_TRACE(rs_create_aml_resources);
 408
 409        /* Params already validated, no need to re-validate here */
 410
 411        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n",
 412                          resource_list->pointer));
 413
 414        /* Get the buffer size needed for the AML byte stream */
 415
 416        status =
 417            acpi_rs_get_aml_length(resource_list->pointer,
 418                                   resource_list->length, &aml_size_needed);
 419
 420        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
 421                          (u32)aml_size_needed, acpi_format_exception(status)));
 422        if (ACPI_FAILURE(status)) {
 423                return_ACPI_STATUS(status);
 424        }
 425
 426        /* Validate/Allocate/Clear caller buffer */
 427
 428        status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
 429        if (ACPI_FAILURE(status)) {
 430                return_ACPI_STATUS(status);
 431        }
 432
 433        /* Do the conversion */
 434
 435        status = acpi_rs_convert_resources_to_aml(resource_list->pointer,
 436                                                  aml_size_needed,
 437                                                  output_buffer->pointer);
 438        if (ACPI_FAILURE(status)) {
 439                return_ACPI_STATUS(status);
 440        }
 441
 442        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 443                          output_buffer->pointer, (u32) output_buffer->length));
 444        return_ACPI_STATUS(AE_OK);
 445}
 446