?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Use dentry_path() to create full path to inode object
[pohmelfs.git] / drivers / acpi / acpica / rscreate.c
blob46d6eb38ae66f5598faba40c70ffaf4466e0459b
1 /*******************************************************************************
2 *
3 * Module Name: rscreate - Create resource lists/tables
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2012, Intel Corp.
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 "accommon.h"
46 #include "acresrc.h"
47 #include "acnamesp.h"
48
49 #define _COMPONENT ACPI_RESOURCES
50 ACPI_MODULE_NAME("rscreate")
51
52 /*******************************************************************************
53 *
54 * FUNCTION: acpi_buffer_to_resource
55 *
56 * PARAMETERS: aml_buffer - Pointer to the resource byte stream
57 * aml_buffer_length - Length of the aml_buffer
58 * resource_ptr - Where the converted resource is returned
59 *
60 * RETURN: Status
61 *
62 * DESCRIPTION: Convert a raw AML buffer to a resource list
63 *
64 ******************************************************************************/
65 acpi_status
66 acpi_buffer_to_resource(u8 *aml_buffer,
67 u16 aml_buffer_length,
68 struct acpi_resource **resource_ptr)
69 {
70 acpi_status status;
71 acpi_size list_size_needed;
72 void *resource;
73 void *current_resource_ptr;
74
75 /*
76 * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
77 * is not required here.
78 */
79
80 /* Get the required length for the converted resource */
81
82 status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
83 &list_size_needed);
84 if (status == AE_AML_NO_RESOURCE_END_TAG) {
85 status = AE_OK;
86 }
87 if (ACPI_FAILURE(status)) {
88 return (status);
89 }
90
91 /* Allocate a buffer for the converted resource */
92
93 resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
94 current_resource_ptr = resource;
95 if (!resource) {
96 return (AE_NO_MEMORY);
97 }
98
99 /* Perform the AML-to-Resource conversion */
100
101 status = acpi_ut_walk_aml_resources(aml_buffer, aml_buffer_length,
102 acpi_rs_convert_aml_to_resources,
103 &current_resource_ptr);
104 if (status == AE_AML_NO_RESOURCE_END_TAG) {
105 status = AE_OK;
106 }
107 if (ACPI_FAILURE(status)) {
108 ACPI_FREE(resource);
109 } else {
110 *resource_ptr = resource;
111 }
112
113 return (status);
114 }
115
116 /*******************************************************************************
117 *
118 * FUNCTION: acpi_rs_create_resource_list
119 *
120 * PARAMETERS: aml_buffer - Pointer to the resource byte stream
121 * output_buffer - Pointer to the user's buffer
122 *
123 * RETURN: Status: AE_OK if okay, else a valid acpi_status code
124 * If output_buffer is not large enough, output_buffer_length
125 * indicates how large output_buffer should be, else it
126 * indicates how may u8 elements of output_buffer are valid.
127 *
128 * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
129 * execution and parses the stream to create a linked list
130 * of device resources.
131 *
132 ******************************************************************************/
133
134 acpi_status
135 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
136 struct acpi_buffer * output_buffer)
137 {
138
139 acpi_status status;
140 u8 *aml_start;
141 acpi_size list_size_needed = 0;
142 u32 aml_buffer_length;
143 void *resource;
144
145 ACPI_FUNCTION_TRACE(rs_create_resource_list);
146
147 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
148
149 /* Params already validated, so we don't re-validate here */
150
151 aml_buffer_length = aml_buffer->buffer.length;
152 aml_start = aml_buffer->buffer.pointer;
153
154 /*
155 * Pass the aml_buffer into a module that can calculate
156 * the buffer size needed for the linked list
157 */
158 status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
159 &list_size_needed);
160
161 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
162 status, (u32) list_size_needed));
163 if (ACPI_FAILURE(status)) {
164 return_ACPI_STATUS(status);
165 }
166
167 /* Validate/Allocate/Clear caller buffer */
168
169 status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
170 if (ACPI_FAILURE(status)) {
171 return_ACPI_STATUS(status);
172 }
173
174 /* Do the conversion */
175
176 resource = output_buffer->pointer;
177 status = acpi_ut_walk_aml_resources(aml_start, aml_buffer_length,
178 acpi_rs_convert_aml_to_resources,
179 &resource);
180 if (ACPI_FAILURE(status)) {
181 return_ACPI_STATUS(status);
182 }
183
184 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
185 output_buffer->pointer, (u32) output_buffer->length));
186 return_ACPI_STATUS(AE_OK);
187 }
188
189 /*******************************************************************************
190 *
191 * FUNCTION: acpi_rs_create_pci_routing_table
192 *
193 * PARAMETERS: package_object - Pointer to a union acpi_operand_object
194 * package
195 * output_buffer - Pointer to the user's buffer
196 *
197 * RETURN: Status AE_OK if okay, else a valid acpi_status code.
198 * If the output_buffer is too small, the error will be
199 * AE_BUFFER_OVERFLOW and output_buffer->Length will point
200 * to the size buffer needed.
201 *
202 * DESCRIPTION: Takes the union acpi_operand_object package and creates a
203 * linked list of PCI interrupt descriptions
204 *
205 * NOTE: It is the caller's responsibility to ensure that the start of the
206 * output buffer is aligned properly (if necessary).
207 *
208 ******************************************************************************/
209
210 acpi_status
211 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
212 struct acpi_buffer *output_buffer)
213 {
214 u8 *buffer;
215 union acpi_operand_object **top_object_list;
216 union acpi_operand_object **sub_object_list;
217 union acpi_operand_object *obj_desc;
218 acpi_size buffer_size_needed = 0;
219 u32 number_of_elements;
220 u32 index;
221 struct acpi_pci_routing_table *user_prt;
222 struct acpi_namespace_node *node;
223 acpi_status status;
224 struct acpi_buffer path_buffer;
225
226 ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
227
228 /* Params already validated, so we don't re-validate here */
229
230 /* Get the required buffer length */
231
232 status = acpi_rs_get_pci_routing_table_length(package_object,
233 &buffer_size_needed);
234 if (ACPI_FAILURE(status)) {
235 return_ACPI_STATUS(status);
236 }
237
238 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
239 (u32) buffer_size_needed));
240
241 /* Validate/Allocate/Clear caller buffer */
242
243 status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
244 if (ACPI_FAILURE(status)) {
245 return_ACPI_STATUS(status);
246 }
247
248 /*
249 * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
250 * package that in turn contains an u64 Address, a u8 Pin,
251 * a Name, and a u8 source_index.
252 */
253 top_object_list = package_object->package.elements;
254 number_of_elements = package_object->package.count;
255 buffer = output_buffer->pointer;
256 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
257
258 for (index = 0; index < number_of_elements; index++) {
259
260 /*
261 * Point user_prt past this current structure
262 *
263 * NOTE: On the first iteration, user_prt->Length will
264 * be zero because we cleared the return buffer earlier
265 */
266 buffer += user_prt->length;
267 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
268
269 /*
270 * Fill in the Length field with the information we have at this point.
271 * The minus four is to subtract the size of the u8 Source[4] member
272 * because it is added below.
273 */
274 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
275
276 /* Each element of the top-level package must also be a package */
277
278 if ((*top_object_list)->common.type != ACPI_TYPE_PACKAGE) {
279 ACPI_ERROR((AE_INFO,
280 "(PRT[%u]) Need sub-package, found %s",
281 index,
282 acpi_ut_get_object_type_name
283 (*top_object_list)));
284 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
285 }
286
287 /* Each sub-package must be of length 4 */
288
289 if ((*top_object_list)->package.count != 4) {
290 ACPI_ERROR((AE_INFO,
291 "(PRT[%u]) Need package of length 4, found length %u",
292 index, (*top_object_list)->package.count));
293 return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
294 }
295
296 /*
297 * Dereference the sub-package.
298 * The sub_object_list will now point to an array of the four IRQ
299 * elements: [Address, Pin, Source, source_index]
300 */
301 sub_object_list = (*top_object_list)->package.elements;
302
303 /* 1) First subobject: Dereference the PRT.Address */
304
305 obj_desc = sub_object_list[0];
306 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
307 ACPI_ERROR((AE_INFO,
308 "(PRT[%u].Address) Need Integer, found %s",
309 index,
310 acpi_ut_get_object_type_name(obj_desc)));
311 return_ACPI_STATUS(AE_BAD_DATA);
312 }
313
314 user_prt->address = obj_desc->integer.value;
315
316 /* 2) Second subobject: Dereference the PRT.Pin */
317
318 obj_desc = sub_object_list[1];
319 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
320 ACPI_ERROR((AE_INFO,
321 "(PRT[%u].Pin) Need Integer, found %s",
322 index,
323 acpi_ut_get_object_type_name(obj_desc)));
324 return_ACPI_STATUS(AE_BAD_DATA);
325 }
326
327 user_prt->pin = (u32) obj_desc->integer.value;
328
329 /*
330 * If the BIOS has erroneously reversed the _PRT source_name (index 2)
331 * and the source_index (index 3), fix it. _PRT is important enough to
332 * workaround this BIOS error. This also provides compatibility with
333 * other ACPI implementations.
334 */
335 obj_desc = sub_object_list[3];
336 if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
337 sub_object_list[3] = sub_object_list[2];
338 sub_object_list[2] = obj_desc;
339
340 ACPI_WARNING((AE_INFO,
341 "(PRT[%X].Source) SourceName and SourceIndex are reversed, fixed",
342 index));
343 }
344
345 /*
346 * 3) Third subobject: Dereference the PRT.source_name
347 * The name may be unresolved (slack mode), so allow a null object
348 */
349 obj_desc = sub_object_list[2];
350 if (obj_desc) {
351 switch (obj_desc->common.type) {
352 case ACPI_TYPE_LOCAL_REFERENCE:
353
354 if (obj_desc->reference.class !=
355 ACPI_REFCLASS_NAME) {
356 ACPI_ERROR((AE_INFO,
357 "(PRT[%u].Source) Need name, found Reference Class 0x%X",
358 index,
359 obj_desc->reference.class));
360 return_ACPI_STATUS(AE_BAD_DATA);
361 }
362
363 node = obj_desc->reference.node;
364
365 /* Use *remaining* length of the buffer as max for pathname */
366
367 path_buffer.length = output_buffer->length -
368 (u32) ((u8 *) user_prt->source -
369 (u8 *) output_buffer->pointer);
370 path_buffer.pointer = user_prt->source;
371
372 status =
373 acpi_ns_handle_to_pathname((acpi_handle)
374 node,
375 &path_buffer);
376
377 /* +1 to include null terminator */
378
379 user_prt->length +=
380 (u32) ACPI_STRLEN(user_prt->source) + 1;
381 break;
382
383 case ACPI_TYPE_STRING:
384
385 ACPI_STRCPY(user_prt->source,
386 obj_desc->string.pointer);
387
388 /*
389 * Add to the Length field the length of the string
390 * (add 1 for terminator)
391 */
392 user_prt->length += obj_desc->string.length + 1;
393 break;
394
395 case ACPI_TYPE_INTEGER:
396 /*
397 * If this is a number, then the Source Name is NULL, since the
398 * entire buffer was zeroed out, we can leave this alone.
399 *
400 * Add to the Length field the length of the u32 NULL
401 */
402 user_prt->length += sizeof(u32);
403 break;
404
405 default:
406
407 ACPI_ERROR((AE_INFO,
408 "(PRT[%u].Source) Need Ref/String/Integer, found %s",
409 index,
410 acpi_ut_get_object_type_name
411 (obj_desc)));
412 return_ACPI_STATUS(AE_BAD_DATA);
413 }
414 }
415
416 /* Now align the current length */
417
418 user_prt->length =
419 (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
420
421 /* 4) Fourth subobject: Dereference the PRT.source_index */
422
423 obj_desc = sub_object_list[3];
424 if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
425 ACPI_ERROR((AE_INFO,
426 "(PRT[%u].SourceIndex) Need Integer, found %s",
427 index,
428 acpi_ut_get_object_type_name(obj_desc)));
429 return_ACPI_STATUS(AE_BAD_DATA);
430 }
431
432 user_prt->source_index = (u32) obj_desc->integer.value;
433
434 /* Point to the next union acpi_operand_object in the top level package */
435
436 top_object_list++;
437 }
438
439 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
440 output_buffer->pointer, (u32) output_buffer->length));
441 return_ACPI_STATUS(AE_OK);
442 }
443
444 /*******************************************************************************
445 *
446 * FUNCTION: acpi_rs_create_aml_resources
447 *
448 * PARAMETERS: linked_list_buffer - Pointer to the resource linked list
449 * output_buffer - Pointer to the user's buffer
450 *
451 * RETURN: Status AE_OK if okay, else a valid acpi_status code.
452 * If the output_buffer is too small, the error will be
453 * AE_BUFFER_OVERFLOW and output_buffer->Length will point
454 * to the size buffer needed.
455 *
456 * DESCRIPTION: Takes the linked list of device resources and
457 * creates a bytestream to be used as input for the
458 * _SRS control method.
459 *
460 ******************************************************************************/
461
462 acpi_status
463 acpi_rs_create_aml_resources(struct acpi_resource *linked_list_buffer,
464 struct acpi_buffer *output_buffer)
465 {
466 acpi_status status;
467 acpi_size aml_size_needed = 0;
468
469 ACPI_FUNCTION_TRACE(rs_create_aml_resources);
470
471 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "LinkedListBuffer = %p\n",
472 linked_list_buffer));
473
474 /*
475 * Params already validated, so we don't re-validate here
476 *
477 * Pass the linked_list_buffer into a module that calculates
478 * the buffer size needed for the byte stream.
479 */
480 status = acpi_rs_get_aml_length(linked_list_buffer, &aml_size_needed);
481
482 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
483 (u32) aml_size_needed,
484 acpi_format_exception(status)));
485 if (ACPI_FAILURE(status)) {
486 return_ACPI_STATUS(status);
487 }
488
489 /* Validate/Allocate/Clear caller buffer */
490
491 status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
492 if (ACPI_FAILURE(status)) {
493 return_ACPI_STATUS(status);
494 }
495
496 /* Do the conversion */
497
498 status =
499 acpi_rs_convert_resources_to_aml(linked_list_buffer,
500 aml_size_needed,
501 output_buffer->pointer);
502 if (ACPI_FAILURE(status)) {
503 return_ACPI_STATUS(status);
504 }
505
506 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
507 output_buffer->pointer, (u32) output_buffer->length));
508 return_ACPI_STATUS(AE_OK);
509 }