drivers/acpi/resources/rscreate.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rscreate - Create resource lists/tables
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, 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
  79         ACPI_FUNCTION_TRACE("rs_create_resource_list");
  80
  81         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aml_buffer = %p\n", aml_buffer));
  82
  83         /* Params already validated, so we don't re-validate here */
  84
  85         aml_buffer_length = aml_buffer->buffer.length;
  86         aml_start = aml_buffer->buffer.pointer;
  87
  88         /*
  89          * Pass the aml_buffer into a module that can calculate
  90          * the buffer size needed for the linked list
  91          */
  92         status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
  93                                          &list_size_needed);
  94
  95         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X list_size_needed=%X\n",
  96                           status, (u32) list_size_needed));
  97         if (ACPI_FAILURE(status)) {
  98                 return_ACPI_STATUS(status);
  99         }
 100
 101         /* Validate/Allocate/Clear caller buffer */
 102
 103         status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
 104         if (ACPI_FAILURE(status)) {
 105                 return_ACPI_STATUS(status);
 106         }
 107
 108         /* Do the conversion */
 109
 110         status = acpi_rs_convert_aml_to_resources(aml_start, aml_buffer_length,
 111                                                   output_buffer->pointer);
 112         if (ACPI_FAILURE(status)) {
 113                 return_ACPI_STATUS(status);
 114         }
 115
 116         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 117                           output_buffer->pointer, (u32) output_buffer->length));
 118         return_ACPI_STATUS(AE_OK);
 119 }
 120
 121 /*******************************************************************************
 122  *
 123  * FUNCTION:    acpi_rs_create_pci_routing_table
 124  *
 125  * PARAMETERS:  package_object          - Pointer to an union acpi_operand_object
 126  *                                        package
 127  *              output_buffer           - Pointer to the user's buffer
 128  *
 129  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 130  *              If the output_buffer is too small, the error will be
 131  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 132  *              to the size buffer needed.
 133  *
 134  * DESCRIPTION: Takes the union acpi_operand_object    package and creates a
 135  *              linked list of PCI interrupt descriptions
 136  *
 137  * NOTE: It is the caller's responsibility to ensure that the start of the
 138  * output buffer is aligned properly (if necessary).
 139  *
 140  ******************************************************************************/
 141
 142 acpi_status
 143 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
 144                                  struct acpi_buffer *output_buffer)
 145 {
 146         u8 *buffer;
 147         union acpi_operand_object **top_object_list;
 148         union acpi_operand_object **sub_object_list;
 149         union acpi_operand_object *obj_desc;
 150         acpi_size buffer_size_needed = 0;
 151         u32 number_of_elements;
 152         u32 index;
 153         struct acpi_pci_routing_table *user_prt;
 154         struct acpi_namespace_node *node;
 155         acpi_status status;
 156         struct acpi_buffer path_buffer;
 157
 158         ACPI_FUNCTION_TRACE("rs_create_pci_routing_table");
 159
 160         /* Params already validated, so we don't re-validate here */
 161
 162         /* Get the required buffer length */
 163
 164         status = acpi_rs_get_pci_routing_table_length(package_object,
 165                                                       &buffer_size_needed);
 166         if (ACPI_FAILURE(status)) {
 167                 return_ACPI_STATUS(status);
 168         }
 169
 170         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "buffer_size_needed = %X\n",
 171                           (u32) buffer_size_needed));
 172
 173         /* Validate/Allocate/Clear caller buffer */
 174
 175         status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
 176         if (ACPI_FAILURE(status)) {
 177                 return_ACPI_STATUS(status);
 178         }
 179
 180         /*
 181          * Loop through the ACPI_INTERNAL_OBJECTS - Each object
 182          * should be a package that in turn contains an
 183          * acpi_integer Address, a u8 Pin, a Name and a u8 source_index.
 184          */
 185         top_object_list = package_object->package.elements;
 186         number_of_elements = package_object->package.count;
 187         buffer = output_buffer->pointer;
 188         user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 189
 190         for (index = 0; index < number_of_elements; index++) {
 191                 /*
 192                  * Point user_prt past this current structure
 193                  *
 194                  * NOTE: On the first iteration, user_prt->Length will
 195                  * be zero because we cleared the return buffer earlier
 196                  */
 197                 buffer += user_prt->length;
 198                 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
 199
 200                 /*
 201                  * Fill in the Length field with the information we have at this point.
 202                  * The minus four is to subtract the size of the u8 Source[4] member
 203                  * because it is added below.
 204                  */
 205                 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
 206
 207                 /* Each element of the top-level package must also be a package */
 208
 209                 if (ACPI_GET_OBJECT_TYPE(*top_object_list) != ACPI_TYPE_PACKAGE) {
 210                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 211                                           "(PRT[%X]) Need sub-package, found %s\n",
 212                                           index,
 213                                           acpi_ut_get_object_type_name
 214                                           (*top_object_list)));
 215                         return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 216                 }
 217
 218                 /* Each sub-package must be of length 4 */
 219
 220                 if ((*top_object_list)->package.count != 4) {
 221                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 222                                           "(PRT[%X]) Need package of length 4, found length %d\n",
 223                                           index,
 224                                           (*top_object_list)->package.count));
 225                         return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
 226                 }
 227
 228                 /*
 229                  * Dereference the sub-package.
 230                  * The sub_object_list will now point to an array of the four IRQ
 231                  * elements: [Address, Pin, Source, source_index]
 232                  */
 233                 sub_object_list = (*top_object_list)->package.elements;
 234
 235                 /* 1) First subobject: Dereference the PRT.Address */
 236
 237                 obj_desc = sub_object_list[0];
 238                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 239                         user_prt->address = obj_desc->integer.value;
 240                 } else {
 241                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 242                                           "(PRT[%X].Address) Need Integer, found %s\n",
 243                                           index,
 244                                           acpi_ut_get_object_type_name
 245                                           (obj_desc)));
 246                         return_ACPI_STATUS(AE_BAD_DATA);
 247                 }
 248
 249                 /* 2) Second subobject: Dereference the PRT.Pin */
 250
 251                 obj_desc = sub_object_list[1];
 252                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 253                         user_prt->pin = (u32) obj_desc->integer.value;
 254                 } else {
 255                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 256                                           "(PRT[%X].Pin) Need Integer, found %s\n",
 257                                           index,
 258                                           acpi_ut_get_object_type_name
 259                                           (obj_desc)));
 260                         return_ACPI_STATUS(AE_BAD_DATA);
 261                 }
 262
 263                 /* 3) Third subobject: Dereference the PRT.source_name */
 264
 265                 obj_desc = sub_object_list[2];
 266                 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
 267                 case ACPI_TYPE_LOCAL_REFERENCE:
 268
 269                         if (obj_desc->reference.opcode != AML_INT_NAMEPATH_OP) {
 270                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 271                                                   "(PRT[%X].Source) Need name, found reference op %X\n",
 272                                                   index,
 273                                                   obj_desc->reference.opcode));
 274                                 return_ACPI_STATUS(AE_BAD_DATA);
 275                         }
 276
 277                         node = obj_desc->reference.node;
 278
 279                         /* Use *remaining* length of the buffer as max for pathname */
 280
 281                         path_buffer.length = output_buffer->length -
 282                             (u32) ((u8 *) user_prt->source -
 283                                    (u8 *) output_buffer->pointer);
 284                         path_buffer.pointer = user_prt->source;
 285
 286                         status =
 287                             acpi_ns_handle_to_pathname((acpi_handle) node,
 288                                                        &path_buffer);
 289
 290                         /* +1 to include null terminator */
 291
 292                         user_prt->length +=
 293                             (u32) ACPI_STRLEN(user_prt->source) + 1;
 294                         break;
 295
 296                 case ACPI_TYPE_STRING:
 297
 298                         ACPI_STRCPY(user_prt->source, obj_desc->string.pointer);
 299
 300                         /*
 301                          * Add to the Length field the length of the string
 302                          * (add 1 for terminator)
 303                          */
 304                         user_prt->length += obj_desc->string.length + 1;
 305                         break;
 306
 307                 case ACPI_TYPE_INTEGER:
 308                         /*
 309                          * If this is a number, then the Source Name is NULL, since the
 310                          * entire buffer was zeroed out, we can leave this alone.
 311                          *
 312                          * Add to the Length field the length of the u32 NULL
 313                          */
 314                         user_prt->length += sizeof(u32);
 315                         break;
 316
 317                 default:
 318
 319                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 320                                           "(PRT[%X].Source) Need Ref/String/Integer, found %s\n",
 321                                           index,
 322                                           acpi_ut_get_object_type_name
 323                                           (obj_desc)));
 324                         return_ACPI_STATUS(AE_BAD_DATA);
 325                 }
 326
 327                 /* Now align the current length */
 328
 329                 user_prt->length =
 330                     (u32) ACPI_ROUND_UP_to_64_bITS(user_prt->length);
 331
 332                 /* 4) Fourth subobject: Dereference the PRT.source_index */
 333
 334                 obj_desc = sub_object_list[3];
 335                 if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
 336                         user_prt->source_index = (u32) obj_desc->integer.value;
 337                 } else {
 338                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 339                                           "(PRT[%X].source_index) Need Integer, found %s\n",
 340                                           index,
 341                                           acpi_ut_get_object_type_name
 342                                           (obj_desc)));
 343                         return_ACPI_STATUS(AE_BAD_DATA);
 344                 }
 345
 346                 /* Point to the next union acpi_operand_object in the top level package */
 347
 348                 top_object_list++;
 349         }
 350
 351         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 352                           output_buffer->pointer, (u32) output_buffer->length));
 353         return_ACPI_STATUS(AE_OK);
 354 }
 355
 356 /*******************************************************************************
 357  *
 358  * FUNCTION:    acpi_rs_create_aml_resources
 359  *
 360  * PARAMETERS:  linked_list_buffer      - Pointer to the resource linked list
 361  *              output_buffer           - Pointer to the user's buffer
 362  *
 363  * RETURN:      Status  AE_OK if okay, else a valid acpi_status code.
 364  *              If the output_buffer is too small, the error will be
 365  *              AE_BUFFER_OVERFLOW and output_buffer->Length will point
 366  *              to the size buffer needed.
 367  *
 368  * DESCRIPTION: Takes the linked list of device resources and
 369  *              creates a bytestream to be used as input for the
 370  *              _SRS control method.
 371  *
 372  ******************************************************************************/
 373
 374 acpi_status
 375 acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer,
 376                              struct acpi_buffer *output_buffer)
 377 {
 378         acpi_status status;
 379         acpi_size aml_size_needed = 0;
 380
 381         ACPI_FUNCTION_TRACE("rs_create_aml_resources");
 382
 383         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "linked_list_buffer = %p\n",
 384                           linked_list_buffer));
 385
 386         /*
 387          * Params already validated, so we don't re-validate here
 388          *
 389          * Pass the linked_list_buffer into a module that calculates
 390          * the buffer size needed for the byte stream.
 391          */
 392         status = acpi_rs_get_aml_length(linked_list_buffer, &aml_size_needed);
 393
 394         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "aml_size_needed=%X, %s\n",
 395                           (u32) aml_size_needed,
 396                           acpi_format_exception(status)));
 397         if (ACPI_FAILURE(status)) {
 398                 return_ACPI_STATUS(status);
 399         }
 400
 401         /* Validate/Allocate/Clear caller buffer */
 402
 403         status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
 404         if (ACPI_FAILURE(status)) {
 405                 return_ACPI_STATUS(status);
 406         }
 407
 408         /* Do the conversion */
 409
 410         status =
 411             acpi_rs_convert_resources_to_aml(linked_list_buffer,
 412                                              aml_size_needed,
 413                                              output_buffer->pointer);
 414         if (ACPI_FAILURE(status)) {
 415                 return_ACPI_STATUS(status);
 416         }
 417
 418         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "output_buffer %p Length %X\n",
 419                           output_buffer->pointer, (u32) output_buffer->length));
 420         return_ACPI_STATUS(AE_OK);
 421 }