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Merge branch 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[mirror_ubuntu-artful-kernel.git] / drivers / acpi / acpica / rscreate.c
1 /*******************************************************************************
2 *
3 * Module Name: rscreate - Create resource lists/tables
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2016, 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 ACPI_FUNCTION_TRACE(acpi_buffer_to_resource);
76
77 /*
78 * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
79 * is not required here.
80 */
81
82 /* Get the required length for the converted resource */
83
84 status =
85 acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
86 &list_size_needed);
87 if (status == AE_AML_NO_RESOURCE_END_TAG) {
88 status = AE_OK;
89 }
90 if (ACPI_FAILURE(status)) {
91 return_ACPI_STATUS(status);
92 }
93
94 /* Allocate a buffer for the converted resource */
95
96 resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
97 current_resource_ptr = resource;
98 if (!resource) {
99 return_ACPI_STATUS(AE_NO_MEMORY);
100 }
101
102 /* Perform the AML-to-Resource conversion */
103
104 status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length,
105 acpi_rs_convert_aml_to_resources,
106 &current_resource_ptr);
107 if (status == AE_AML_NO_RESOURCE_END_TAG) {
108 status = AE_OK;
109 }
110 if (ACPI_FAILURE(status)) {
111 ACPI_FREE(resource);
112 } else {
113 *resource_ptr = resource;
114 }
115
116 return_ACPI_STATUS(status);
117 }
118
119 ACPI_EXPORT_SYMBOL(acpi_buffer_to_resource)
120
121 /*******************************************************************************
122 *
123 * FUNCTION: acpi_rs_create_resource_list
124 *
125 * PARAMETERS: aml_buffer - Pointer to the resource byte stream
126 * output_buffer - Pointer to the user's buffer
127 *
128 * RETURN: Status: AE_OK if okay, else a valid acpi_status code
129 * If output_buffer is not large enough, output_buffer_length
130 * indicates how large output_buffer should be, else it
131 * indicates how may u8 elements of output_buffer are valid.
132 *
133 * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method
134 * execution and parses the stream to create a linked list
135 * of device resources.
136 *
137 ******************************************************************************/
138 acpi_status
139 acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer,
140 struct acpi_buffer *output_buffer)
141 {
142
143 acpi_status status;
144 u8 *aml_start;
145 acpi_size list_size_needed = 0;
146 u32 aml_buffer_length;
147 void *resource;
148
149 ACPI_FUNCTION_TRACE(rs_create_resource_list);
150
151 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer));
152
153 /* Params already validated, so we don't re-validate here */
154
155 aml_buffer_length = aml_buffer->buffer.length;
156 aml_start = aml_buffer->buffer.pointer;
157
158 /*
159 * Pass the aml_buffer into a module that can calculate
160 * the buffer size needed for the linked list
161 */
162 status = acpi_rs_get_list_length(aml_start, aml_buffer_length,
163 &list_size_needed);
164
165 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n",
166 status, (u32) list_size_needed));
167 if (ACPI_FAILURE(status)) {
168 return_ACPI_STATUS(status);
169 }
170
171 /* Validate/Allocate/Clear caller buffer */
172
173 status = acpi_ut_initialize_buffer(output_buffer, list_size_needed);
174 if (ACPI_FAILURE(status)) {
175 return_ACPI_STATUS(status);
176 }
177
178 /* Do the conversion */
179
180 resource = output_buffer->pointer;
181 status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length,
182 acpi_rs_convert_aml_to_resources,
183 &resource);
184 if (ACPI_FAILURE(status)) {
185 return_ACPI_STATUS(status);
186 }
187
188 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
189 output_buffer->pointer, (u32) output_buffer->length));
190 return_ACPI_STATUS(AE_OK);
191 }
192
193 /*******************************************************************************
194 *
195 * FUNCTION: acpi_rs_create_pci_routing_table
196 *
197 * PARAMETERS: package_object - Pointer to a package containing one
198 * of more ACPI_OPERAND_OBJECTs
199 * output_buffer - Pointer to the user's buffer
200 *
201 * RETURN: Status AE_OK if okay, else a valid acpi_status code.
202 * If the output_buffer is too small, the error will be
203 * AE_BUFFER_OVERFLOW and output_buffer->Length will point
204 * to the size buffer needed.
205 *
206 * DESCRIPTION: Takes the union acpi_operand_object package and creates a
207 * linked list of PCI interrupt descriptions
208 *
209 * NOTE: It is the caller's responsibility to ensure that the start of the
210 * output buffer is aligned properly (if necessary).
211 *
212 ******************************************************************************/
213
214 acpi_status
215 acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
216 struct acpi_buffer *output_buffer)
217 {
218 u8 *buffer;
219 union acpi_operand_object **top_object_list;
220 union acpi_operand_object **sub_object_list;
221 union acpi_operand_object *obj_desc;
222 acpi_size buffer_size_needed = 0;
223 u32 number_of_elements;
224 u32 index;
225 struct acpi_pci_routing_table *user_prt;
226 struct acpi_namespace_node *node;
227 acpi_status status;
228 struct acpi_buffer path_buffer;
229
230 ACPI_FUNCTION_TRACE(rs_create_pci_routing_table);
231
232 /* Params already validated, so we don't re-validate here */
233
234 /* Get the required buffer length */
235
236 status =
237 acpi_rs_get_pci_routing_table_length(package_object,
238 &buffer_size_needed);
239 if (ACPI_FAILURE(status)) {
240 return_ACPI_STATUS(status);
241 }
242
243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n",
244 (u32) buffer_size_needed));
245
246 /* Validate/Allocate/Clear caller buffer */
247
248 status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed);
249 if (ACPI_FAILURE(status)) {
250 return_ACPI_STATUS(status);
251 }
252
253 /*
254 * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a
255 * package that in turn contains an u64 Address, a u8 Pin,
256 * a Name, and a u8 source_index.
257 */
258 top_object_list = package_object->package.elements;
259 number_of_elements = package_object->package.count;
260 buffer = output_buffer->pointer;
261 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
262
263 for (index = 0; index < number_of_elements; index++) {
264
265 /*
266 * Point user_prt past this current structure
267 *
268 * NOTE: On the first iteration, user_prt->Length will
269 * be zero because we cleared the return buffer earlier
270 */
271 buffer += user_prt->length;
272 user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer);
273
274 /*
275 * Fill in the Length field with the information we have at this
276 * point. The minus four is to subtract the size of the u8
277 * Source[4] member because it is added below.
278 */
279 user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4);
280
281 /* Each subpackage must be of length 4 */
282
283 if ((*top_object_list)->package.count != 4) {
284 ACPI_ERROR((AE_INFO,
285 "(PRT[%u]) Need package of length 4, found length %u",
286 index, (*top_object_list)->package.count));
287 return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT);
288 }
289
290 /*
291 * Dereference the subpackage.
292 * The sub_object_list will now point to an array of the four IRQ
293 * elements: [Address, Pin, Source, source_index]
294 */
295 sub_object_list = (*top_object_list)->package.elements;
296
297 /* 1) First subobject: Dereference the PRT.Address */
298
299 obj_desc = sub_object_list[0];
300 if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
301 ACPI_ERROR((AE_INFO,
302 "(PRT[%u].Address) Need Integer, found %s",
303 index,
304 acpi_ut_get_object_type_name(obj_desc)));
305 return_ACPI_STATUS(AE_BAD_DATA);
306 }
307
308 user_prt->address = obj_desc->integer.value;
309
310 /* 2) Second subobject: Dereference the PRT.Pin */
311
312 obj_desc = sub_object_list[1];
313 if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
314 ACPI_ERROR((AE_INFO,
315 "(PRT[%u].Pin) Need Integer, found %s",
316 index,
317 acpi_ut_get_object_type_name(obj_desc)));
318 return_ACPI_STATUS(AE_BAD_DATA);
319 }
320
321 user_prt->pin = (u32) obj_desc->integer.value;
322
323 /*
324 * 3) Third subobject: Dereference the PRT.source_name
325 * The name may be unresolved (slack mode), so allow a null object
326 */
327 obj_desc = sub_object_list[2];
328 if (obj_desc) {
329 switch (obj_desc->common.type) {
330 case ACPI_TYPE_LOCAL_REFERENCE:
331
332 if (obj_desc->reference.class !=
333 ACPI_REFCLASS_NAME) {
334 ACPI_ERROR((AE_INFO,
335 "(PRT[%u].Source) Need name, found Reference Class 0x%X",
336 index,
337 obj_desc->reference.class));
338 return_ACPI_STATUS(AE_BAD_DATA);
339 }
340
341 node = obj_desc->reference.node;
342
343 /* Use *remaining* length of the buffer as max for pathname */
344
345 path_buffer.length = output_buffer->length -
346 (u32) ((u8 *) user_prt->source -
347 (u8 *) output_buffer->pointer);
348 path_buffer.pointer = user_prt->source;
349
350 status = acpi_ns_handle_to_pathname((acpi_handle)node, &path_buffer, FALSE);
351
352 /* +1 to include null terminator */
353
354 user_prt->length +=
355 (u32)strlen(user_prt->source) + 1;
356 break;
357
358 case ACPI_TYPE_STRING:
359
360 strcpy(user_prt->source,
361 obj_desc->string.pointer);
362
363 /*
364 * Add to the Length field the length of the string
365 * (add 1 for terminator)
366 */
367 user_prt->length += obj_desc->string.length + 1;
368 break;
369
370 case ACPI_TYPE_INTEGER:
371 /*
372 * If this is a number, then the Source Name is NULL, since
373 * the entire buffer was zeroed out, we can leave this alone.
374 *
375 * Add to the Length field the length of the u32 NULL
376 */
377 user_prt->length += sizeof(u32);
378 break;
379
380 default:
381
382 ACPI_ERROR((AE_INFO,
383 "(PRT[%u].Source) Need Ref/String/Integer, found %s",
384 index,
385 acpi_ut_get_object_type_name
386 (obj_desc)));
387 return_ACPI_STATUS(AE_BAD_DATA);
388 }
389 }
390
391 /* Now align the current length */
392
393 user_prt->length =
394 (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length);
395
396 /* 4) Fourth subobject: Dereference the PRT.source_index */
397
398 obj_desc = sub_object_list[3];
399 if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) {
400 ACPI_ERROR((AE_INFO,
401 "(PRT[%u].SourceIndex) Need Integer, found %s",
402 index,
403 acpi_ut_get_object_type_name(obj_desc)));
404 return_ACPI_STATUS(AE_BAD_DATA);
405 }
406
407 user_prt->source_index = (u32) obj_desc->integer.value;
408
409 /* Point to the next union acpi_operand_object in the top level package */
410
411 top_object_list++;
412 }
413
414 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
415 output_buffer->pointer, (u32) output_buffer->length));
416 return_ACPI_STATUS(AE_OK);
417 }
418
419 /*******************************************************************************
420 *
421 * FUNCTION: acpi_rs_create_aml_resources
422 *
423 * PARAMETERS: resource_list - Pointer to the resource list buffer
424 * output_buffer - Where the AML buffer is returned
425 *
426 * RETURN: Status AE_OK if okay, else a valid acpi_status code.
427 * If the output_buffer is too small, the error will be
428 * AE_BUFFER_OVERFLOW and output_buffer->Length will point
429 * to the size buffer needed.
430 *
431 * DESCRIPTION: Converts a list of device resources to an AML bytestream
432 * to be used as input for the _SRS control method.
433 *
434 ******************************************************************************/
435
436 acpi_status
437 acpi_rs_create_aml_resources(struct acpi_buffer *resource_list,
438 struct acpi_buffer *output_buffer)
439 {
440 acpi_status status;
441 acpi_size aml_size_needed = 0;
442
443 ACPI_FUNCTION_TRACE(rs_create_aml_resources);
444
445 /* Params already validated, no need to re-validate here */
446
447 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n",
448 resource_list->pointer));
449
450 /* Get the buffer size needed for the AML byte stream */
451
452 status =
453 acpi_rs_get_aml_length(resource_list->pointer,
454 resource_list->length, &aml_size_needed);
455
456 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n",
457 (u32)aml_size_needed, acpi_format_exception(status)));
458 if (ACPI_FAILURE(status)) {
459 return_ACPI_STATUS(status);
460 }
461
462 /* Validate/Allocate/Clear caller buffer */
463
464 status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed);
465 if (ACPI_FAILURE(status)) {
466 return_ACPI_STATUS(status);
467 }
468
469 /* Do the conversion */
470
471 status = acpi_rs_convert_resources_to_aml(resource_list->pointer,
472 aml_size_needed,
473 output_buffer->pointer);
474 if (ACPI_FAILURE(status)) {
475 return_ACPI_STATUS(status);
476 }
477
478 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n",
479 output_buffer->pointer, (u32) output_buffer->length));
480 return_ACPI_STATUS(AE_OK);
481 }
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