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
  14 ACPI_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  ******************************************************************************/
  29 acpi_status
  30 acpi_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
  83 ACPI_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  ******************************************************************************/
 102 acpi_status
 103 acpi_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
 178 acpi_status
 179 acpi_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
 400 acpi_status
 401 acpi_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 }