err.no Git - linux-2.6/blob - drivers/acpi/resources/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   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 <acpi/acresrc.h>
  46 #include <acpi/amlcode.h>
  47 #include <acpi/acnamesp.h>
  48
  49 #define _COMPONENT          ACPI_RESOURCES
  50 ACPI_MODULE_NAME("rscreate")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_rs_create_resource_list
  55  *
  56  * PARAMETERS:  aml_buffer          - Pointer to the resource byte stream
  57  *              output_buffer       - Pointer to the user's buffer
  58  *
  59  * RETURN:      Status: AE_OK if okay, else a valid acpi_status code
  60  *              If output_buffer is not large enough, output_buffer_length
  61  *              indicates how large output_buffer should be, else it
  62  *              indicates how may u8 elements of output_buffer are valid.
  63  *
  64  * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
  65  *              execution and parses the stream to create a linked list
  66  *              of device resources.
  67  *
  68  ******************************************************************************/
  69 acpi_status
  70 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
  71                              struct acpi_buffer *output_buffer)
  72 {
  73
  74         acpi_status status;
  75         u8 *aml_start;
  76         acpi_size list_size_needed = 0;
  77         u32 aml_buffer_length;
  78         void *resource;
  79
  80         ACPI_FUNCTION_TRACE(rs_create_resource_list);
  81
  82         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
  83
  84         /* Params already validated, so we don't re-validate here */
  85
  86         aml_buffer_length = aml_buffer->buffer.length;
  87         aml_start = aml_buffer->buffer.pointer;
  88
  89         /*
  90          * Pass the aml_buffer into a module that can calculate
  91          * the buffer size needed for the linked list
  92          */
  93         status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
  94                                          &list_size_needed);
  95
  96         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
  97                           status, (u32) list_size_needed));
  98         if (ACPI_FAILURE(status)) {
  99                 return_ACPI_STATUS(status);
 100         }
 101
 102         /* Validate/Allocate/Clear caller buffer */
 103
 104         status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 105         if (ACPI_FAILURE(status)) {
 106                 return_ACPI_STATUS(status);
 107         }
 108
 109         /* Do the conversion */
 110
 111         resource = output_buffer->pointer;
 112         status = acpi_ut_walk_aml_resources(aml_start, aml_buffer_length,
 113                                             acpi_rs_convert_aml_to_resources,
 114                                             &resource);
 115         if (ACPI_FAILURE(status)) {
 116                 return_ACPI_STATUS(status);
 117         }
 118
 119         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 120                           output_buffer->pointer, (u32) output_buffer->length));
 121         return_ACPI_STATUS(AE_OK);
 122 }
 123
 124 /*******************************************************************************
 125  *
 126  * FUNCTION:    acpi_rs_create_pci_routing_table
 127  *
 128  * PARAMETERS:  package_object          - Pointer to an union acpi_operand_object
 129  *                                        package
 130  *              output_buffer           - Pointer to the user's buffer
 131  *
 132  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 133  *              If the output_buffer is too small, the error will be
 134  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 135  *              to the size buffer needed.
 136  *
 137  * DESCRIPTION: Takes the union acpi_operand_object    package and creates a
 138  *              linked list of PCI interrupt descriptions
 139  *
 140  * NOTE: It is the caller's responsibility to ensure that the start of the
 141  * output buffer is aligned properly (if necessary).
 142  *
 143  ******************************************************************************/
 144
 145 acpi_status
 146 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 147                                  struct acpi_buffer *output_buffer)
 148 {
 149         u8 *buffer;
 150         union acpi_operand_object **top_object_list;
 151         union acpi_operand_object **sub_object_list;
 152         union acpi_operand_object *obj_desc;
 153         acpi_size buffer_size_needed = 0;
 154         u32 number_of_elements;
 155         u32 index;
 156         struct acpi_pci_routing_table *user_prt;
 157         struct acpi_namespace_node *node;
 158         acpi_status status;
 159         struct acpi_buffer path_buffer;
 160
 161         ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
 162
 163         /* Params already validated, so we don't re-validate here */
 164
 165         /* Get the required buffer length */
 166
 167         status = acpi_rs_get_pci_routing_table_length(package_object,
 168                                                       &buffer_size_needed);
 169         if (ACPI_FAILURE(status)) {
 170                 return_ACPI_STATUS(status);
 171         }
 172
 173         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
 174                           (u32) buffer_size_needed));
 175
 176         /* Validate/Allocate/Clear caller buffer */
 177
 178         status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 179         if (ACPI_FAILURE(status)) {
 180                 return_ACPI_STATUS(status);
 181         }
 182
 183         /*
 184          * Loop through the ACPI_INTERNAL_OBJECTS - Each object
 185          * should be a package that in turn contains an
 186          * acpi_integer Address, a u8 Pin, a Name and a u8 source_index.
 187          */
 188         top_object_list = package_object->package.elements;
 189         number_of_elements = package_object->package.count;
 190         buffer = output_buffer->pointer;
 191         user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 192
 193         for (index = 0; index < number_of_elements; index++) {
 194                 /*
 195                  * Point user_prt past this current structure
 196                  *
 197                  * NOTE: On the first iteration, user_prt->Length will
 198                  * be zero because we cleared the return buffer earlier
 199                  */
 200                 buffer += user_prt->length;
 201                 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 202
 203                 /*
 204                  * Fill in the Length field with the information we have at this point.
 205                  * The minus four is to subtract the size of the u8 Source[4] member
 206                  * because it is added below.
 207                  */
 208                 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 209
 210                 /* Each element of the top-level package must also be a package */
 211
 212                 if (ACPI_GET_OBJECT_TYPE(*top_object_list) != ACPI_TYPE_PACKAGE) {
 213                         ACPI_ERROR((AE_INFO,
 214                                     "(PRT[%X]) Need sub-package, found %s",
 215                                     index,
 216                                     acpi_ut_get_object_type_name
 217                                     (*top_object_list)));
 218                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 219                 }
 220
 221                 /* Each sub-package must be of length 4 */
 222
 223                 if ((*top_object_list)->package.count != 4) {
 224                         ACPI_ERROR((AE_INFO,
 225                                     "(PRT[%X]) Need package of length 4, found length %d",
 226                                     index, (*top_object_list)->package.count));
 227                         return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 228                 }
 229
 230                 /*
 231                  * Dereference the sub-package.
 232                  * The sub_object_list will now point to an array of the four IRQ
 233                  * elements: [Address, Pin, Source, source_index]
 234                  */
 235                 sub_object_list = (*top_object_list)->package.elements;
 236
 237                 /* 1) First subobject: Dereference the PRT.Address */
 238
 239                 obj_desc = sub_object_list[0];
 240                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 241                         user_prt->address = obj_desc->integer.value;
 242                 } else {
 243                         ACPI_ERROR((AE_INFO,
 244                                     "(PRT[%X].Address) Need Integer, found %s",
 245                                     index,
 246                                     acpi_ut_get_object_type_name(obj_desc)));
 247                         return_ACPI_STATUS(AE_BAD_DATA);
 248                 }
 249
 250                 /* 2) Second subobject: Dereference the PRT.Pin */
 251
 252                 obj_desc = sub_object_list[1];
 253                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 254                         user_prt->pin = (u32) obj_desc->integer.value;
 255                 } else {
 256                         ACPI_ERROR((AE_INFO,
 257                                     "(PRT[%X].Pin) Need Integer, found %s",
 258                                     index,
 259                                     acpi_ut_get_object_type_name(obj_desc)));
 260                         return_ACPI_STATUS(AE_BAD_DATA);
 261                 }
 262
 263                 /*
 264                  * 3) Third subobject: Dereference the PRT.source_name
 265                  * The name may be unresolved (slack mode), so allow a null object
 266                  */
 267                 obj_desc = sub_object_list[2];
 268                 if (obj_desc) {
 269                         switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 270                         case ACPI_TYPE_LOCAL_REFERENCE:
 271
 272                                 if (obj_desc->reference.opcode !=
 273                                     AML_INT_NAMEPATH_OP) {
 274                                         ACPI_ERROR((AE_INFO,
 275                                                     "(PRT[%X].Source) Need name, found reference op %X",
 276                                                     index,
 277                                                     obj_desc->reference.
 278                                                     opcode));
 279                                         return_ACPI_STATUS(AE_BAD_DATA);
 280                                 }
 281
 282                                 node = obj_desc->reference.node;
 283
 284                                 /* Use *remaining* length of the buffer as max for pathname */
 285
 286                                 path_buffer.length = output_buffer->length -
 287                                     (u32) ((u8 *) user_prt->source -
 288                                            (u8 *) output_buffer->pointer);
 289                                 path_buffer.pointer = user_prt->source;
 290
 291                                 status =
 292                                     acpi_ns_handle_to_pathname((acpi_handle)
 293                                                                node,
 294                                                                &path_buffer);
 295
 296                                 /* +1 to include null terminator */
 297
 298                                 user_prt->length +=
 299                                     (u32) ACPI_STRLEN(user_prt->source) + 1;
 300                                 break;
 301
 302                         case ACPI_TYPE_STRING:
 303
 304                                 ACPI_STRCPY(user_prt->source,
 305                                             obj_desc->string.pointer);
 306
 307                                 /*
 308                                  * Add to the Length field the length of the string
 309                                  * (add 1 for terminator)
 310                                  */
 311                                 user_prt->length += obj_desc->string.length + 1;
 312                                 break;
 313
 314                         case ACPI_TYPE_INTEGER:
 315                                 /*
 316                                  * If this is a number, then the Source Name is NULL, since the
 317                                  * entire buffer was zeroed out, we can leave this alone.
 318                                  *
 319                                  * Add to the Length field the length of the u32 NULL
 320                                  */
 321                                 user_prt->length += sizeof(u32);
 322                                 break;
 323
 324                         default:
 325
 326                                 ACPI_ERROR((AE_INFO,
 327                                             "(PRT[%X].Source) Need Ref/String/Integer, found %s",
 328                                             index,
 329                                             acpi_ut_get_object_type_name
 330                                             (obj_desc)));
 331                                 return_ACPI_STATUS(AE_BAD_DATA);
 332                         }
 333                 }
 334
 335                 /* Now align the current length */
 336
 337                 user_prt->length =
 338                     (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
 339
 340                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 341
 342                 obj_desc = sub_object_list[3];
 343                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 344                         user_prt->source_index = (u32) obj_desc->integer.value;
 345                 } else {
 346                         ACPI_ERROR((AE_INFO,
 347                                     "(PRT[%X].SourceIndex) Need Integer, found %s",
 348                                     index,
 349                                     acpi_ut_get_object_type_name(obj_desc)));
 350                         return_ACPI_STATUS(AE_BAD_DATA);
 351                 }
 352
 353                 /* Point to the next union acpi_operand_object in the top level package */
 354
 355                 top_object_list++;
 356         }
 357
 358         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 359                           output_buffer->pointer, (u32) output_buffer->length));
 360         return_ACPI_STATUS(AE_OK);
 361 }
 362
 363 /*******************************************************************************
 364  *
 365  * FUNCTION:    acpi_rs_create_aml_resources
 366  *
 367  * PARAMETERS:  linked_list_buffer      - Pointer to the resource linked list
 368  *              output_buffer           - Pointer to the user's buffer
 369  *
 370  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 371  *              If the output_buffer is too small, the error will be
 372  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 373  *              to the size buffer needed.
 374  *
 375  * DESCRIPTION: Takes the linked list of device resources and
 376  *              creates a bytestream to be used as input for the
 377  *              _SRS control method.
 378  *
 379  ******************************************************************************/
 380
 381 acpi_status
 382 acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer,
 383                              struct acpi_buffer *output_buffer)
 384 {
 385         acpi_status status;
 386         acpi_size aml_size_needed = 0;
 387
 388         ACPI_FUNCTION_TRACE(rs_create_aml_resources);
 389
 390         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "LinkedListBuffer = %p\n",
 391                           linked_list_buffer));
 392
 393         /*
 394          * Params already validated, so we don't re-validate here
 395          *
 396          * Pass the linked_list_buffer into a module that calculates
 397          * the buffer size needed for the byte stream.
 398          */
 399         status = acpi_rs_get_aml_length(linked_list_buffer, &aml_size_needed);
 400
 401         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
 402                           (u32) aml_size_needed,
 403                           acpi_format_exception(status)));
 404         if (ACPI_FAILURE(status)) {
 405                 return_ACPI_STATUS(status);
 406         }
 407
 408         /* Validate/Allocate/Clear caller buffer */
 409
 410         status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
 411         if (ACPI_FAILURE(status)) {
 412                 return_ACPI_STATUS(status);
 413         }
 414
 415         /* Do the conversion */
 416
 417         status =
 418             acpi_rs_convert_resources_to_aml(linked_list_buffer,
 419                                              aml_size_needed,
 420                                              output_buffer->pointer);
 421         if (ACPI_FAILURE(status)) {
 422                 return_ACPI_STATUS(status);
 423         }
 424
 425         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
 426                           output_buffer->pointer, (u32) output_buffer->length));
 427         return_ACPI_STATUS(AE_OK);
 428 }