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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / acpi / acpica / rscalc.c
blob3a8a89ec2ca4195d14a90b620918f6f4aa9cd881
1 /*******************************************************************************
2 *
3 * Module Name: rscalc - Calculate stream and list lengths
4 *
5 ******************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2011, 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("rscalc")
51
52 /* Local prototypes */
53 static u8 acpi_rs_count_set_bits(u16 bit_field);
54
55 static acpi_rs_length
56 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source);
57
58 static u32
59 acpi_rs_stream_option_length(u32 resource_length, u32 minimum_total_length);
60
61 /*******************************************************************************
62 *
63 * FUNCTION: acpi_rs_count_set_bits
64 *
65 * PARAMETERS: bit_field - Field in which to count bits
66 *
67 * RETURN: Number of bits set within the field
68 *
69 * DESCRIPTION: Count the number of bits set in a resource field. Used for
70 * (Short descriptor) interrupt and DMA lists.
71 *
72 ******************************************************************************/
73
74 static u8 acpi_rs_count_set_bits(u16 bit_field)
75 {
76 u8 bits_set;
77
78 ACPI_FUNCTION_ENTRY();
79
80 for (bits_set = 0; bit_field; bits_set++) {
81
82 /* Zero the least significant bit that is set */
83
84 bit_field &= (u16) (bit_field - 1);
85 }
86
87 return bits_set;
88 }
89
90 /*******************************************************************************
91 *
92 * FUNCTION: acpi_rs_struct_option_length
93 *
94 * PARAMETERS: resource_source - Pointer to optional descriptor field
95 *
96 * RETURN: Status
97 *
98 * DESCRIPTION: Common code to handle optional resource_source_index and
99 * resource_source fields in some Large descriptors. Used during
100 * list-to-stream conversion
101 *
102 ******************************************************************************/
103
104 static acpi_rs_length
105 acpi_rs_struct_option_length(struct acpi_resource_source *resource_source)
106 {
107 ACPI_FUNCTION_ENTRY();
108
109 /*
110 * If the resource_source string is valid, return the size of the string
111 * (string_length includes the NULL terminator) plus the size of the
112 * resource_source_index (1).
113 */
114 if (resource_source->string_ptr) {
115 return ((acpi_rs_length) (resource_source->string_length + 1));
116 }
117
118 return (0);
119 }
120
121 /*******************************************************************************
122 *
123 * FUNCTION: acpi_rs_stream_option_length
124 *
125 * PARAMETERS: resource_length - Length from the resource header
126 * minimum_total_length - Minimum length of this resource, before
127 * any optional fields. Includes header size
128 *
129 * RETURN: Length of optional string (0 if no string present)
130 *
131 * DESCRIPTION: Common code to handle optional resource_source_index and
132 * resource_source fields in some Large descriptors. Used during
133 * stream-to-list conversion
134 *
135 ******************************************************************************/
136
137 static u32
138 acpi_rs_stream_option_length(u32 resource_length,
139 u32 minimum_aml_resource_length)
140 {
141 u32 string_length = 0;
142
143 ACPI_FUNCTION_ENTRY();
144
145 /*
146 * The resource_source_index and resource_source are optional elements of some
147 * Large-type resource descriptors.
148 */
149
150 /*
151 * If the length of the actual resource descriptor is greater than the ACPI
152 * spec-defined minimum length, it means that a resource_source_index exists
153 * and is followed by a (required) null terminated string. The string length
154 * (including the null terminator) is the resource length minus the minimum
155 * length, minus one byte for the resource_source_index itself.
156 */
157 if (resource_length > minimum_aml_resource_length) {
158
159 /* Compute the length of the optional string */
160
161 string_length =
162 resource_length - minimum_aml_resource_length - 1;
163 }
164
165 /*
166 * Round the length up to a multiple of the native word in order to
167 * guarantee that the entire resource descriptor is native word aligned
168 */
169 return ((u32) ACPI_ROUND_UP_TO_NATIVE_WORD(string_length));
170 }
171
172 /*******************************************************************************
173 *
174 * FUNCTION: acpi_rs_get_aml_length
175 *
176 * PARAMETERS: Resource - Pointer to the resource linked list
177 * size_needed - Where the required size is returned
178 *
179 * RETURN: Status
180 *
181 * DESCRIPTION: Takes a linked list of internal resource descriptors and
182 * calculates the size buffer needed to hold the corresponding
183 * external resource byte stream.
184 *
185 ******************************************************************************/
186
187 acpi_status
188 acpi_rs_get_aml_length(struct acpi_resource * resource, acpi_size * size_needed)
189 {
190 acpi_size aml_size_needed = 0;
191 acpi_rs_length total_size;
192
193 ACPI_FUNCTION_TRACE(rs_get_aml_length);
194
195 /* Traverse entire list of internal resource descriptors */
196
197 while (resource) {
198
199 /* Validate the descriptor type */
200
201 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
202 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
203 }
204
205 /* Get the base size of the (external stream) resource descriptor */
206
207 total_size = acpi_gbl_aml_resource_sizes[resource->type];
208
209 /*
210 * Augment the base size for descriptors with optional and/or
211 * variable-length fields
212 */
213 switch (resource->type) {
214 case ACPI_RESOURCE_TYPE_IRQ:
215
216 /* Length can be 3 or 2 */
217
218 if (resource->data.irq.descriptor_length == 2) {
219 total_size--;
220 }
221 break;
222
223 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
224
225 /* Length can be 1 or 0 */
226
227 if (resource->data.irq.descriptor_length == 0) {
228 total_size--;
229 }
230 break;
231
232 case ACPI_RESOURCE_TYPE_VENDOR:
233 /*
234 * Vendor Defined Resource:
235 * For a Vendor Specific resource, if the Length is between 1 and 7
236 * it will be created as a Small Resource data type, otherwise it
237 * is a Large Resource data type.
238 */
239 if (resource->data.vendor.byte_length > 7) {
240
241 /* Base size of a Large resource descriptor */
242
243 total_size =
244 sizeof(struct aml_resource_large_header);
245 }
246
247 /* Add the size of the vendor-specific data */
248
249 total_size = (acpi_rs_length)
250 (total_size + resource->data.vendor.byte_length);
251 break;
252
253 case ACPI_RESOURCE_TYPE_END_TAG:
254 /*
255 * End Tag:
256 * We are done -- return the accumulated total size.
257 */
258 *size_needed = aml_size_needed + total_size;
259
260 /* Normal exit */
261
262 return_ACPI_STATUS(AE_OK);
263
264 case ACPI_RESOURCE_TYPE_ADDRESS16:
265 /*
266 * 16-Bit Address Resource:
267 * Add the size of the optional resource_source info
268 */
269 total_size = (acpi_rs_length)
270 (total_size +
271 acpi_rs_struct_option_length(&resource->data.
272 address16.
273 resource_source));
274 break;
275
276 case ACPI_RESOURCE_TYPE_ADDRESS32:
277 /*
278 * 32-Bit Address Resource:
279 * Add the size of the optional resource_source info
280 */
281 total_size = (acpi_rs_length)
282 (total_size +
283 acpi_rs_struct_option_length(&resource->data.
284 address32.
285 resource_source));
286 break;
287
288 case ACPI_RESOURCE_TYPE_ADDRESS64:
289 /*
290 * 64-Bit Address Resource:
291 * Add the size of the optional resource_source info
292 */
293 total_size = (acpi_rs_length)
294 (total_size +
295 acpi_rs_struct_option_length(&resource->data.
296 address64.
297 resource_source));
298 break;
299
300 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
301 /*
302 * Extended IRQ Resource:
303 * Add the size of each additional optional interrupt beyond the
304 * required 1 (4 bytes for each u32 interrupt number)
305 */
306 total_size = (acpi_rs_length)
307 (total_size +
308 ((resource->data.extended_irq.interrupt_count -
309 1) * 4) +
310 /* Add the size of the optional resource_source info */
311 acpi_rs_struct_option_length(&resource->data.
312 extended_irq.
313 resource_source));
314 break;
315
316 default:
317 break;
318 }
319
320 /* Update the total */
321
322 aml_size_needed += total_size;
323
324 /* Point to the next object */
325
326 resource =
327 ACPI_ADD_PTR(struct acpi_resource, resource,
328 resource->length);
329 }
330
331 /* Did not find an end_tag resource descriptor */
332
333 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
334 }
335
336 /*******************************************************************************
337 *
338 * FUNCTION: acpi_rs_get_list_length
339 *
340 * PARAMETERS: aml_buffer - Pointer to the resource byte stream
341 * aml_buffer_length - Size of aml_buffer
342 * size_needed - Where the size needed is returned
343 *
344 * RETURN: Status
345 *
346 * DESCRIPTION: Takes an external resource byte stream and calculates the size
347 * buffer needed to hold the corresponding internal resource
348 * descriptor linked list.
349 *
350 ******************************************************************************/
351
352 acpi_status
353 acpi_rs_get_list_length(u8 * aml_buffer,
354 u32 aml_buffer_length, acpi_size * size_needed)
355 {
356 acpi_status status;
357 u8 *end_aml;
358 u8 *buffer;
359 u32 buffer_size;
360 u16 temp16;
361 u16 resource_length;
362 u32 extra_struct_bytes;
363 u8 resource_index;
364 u8 minimum_aml_resource_length;
365
366 ACPI_FUNCTION_TRACE(rs_get_list_length);
367
368 *size_needed = 0;
369 end_aml = aml_buffer + aml_buffer_length;
370
371 /* Walk the list of AML resource descriptors */
372
373 while (aml_buffer < end_aml) {
374
375 /* Validate the Resource Type and Resource Length */
376
377 status = acpi_ut_validate_resource(aml_buffer, &resource_index);
378 if (ACPI_FAILURE(status)) {
379 return_ACPI_STATUS(status);
380 }
381
382 /* Get the resource length and base (minimum) AML size */
383
384 resource_length = acpi_ut_get_resource_length(aml_buffer);
385 minimum_aml_resource_length =
386 acpi_gbl_resource_aml_sizes[resource_index];
387
388 /*
389 * Augment the size for descriptors with optional
390 * and/or variable length fields
391 */
392 extra_struct_bytes = 0;
393 buffer =
394 aml_buffer + acpi_ut_get_resource_header_length(aml_buffer);
395
396 switch (acpi_ut_get_resource_type(aml_buffer)) {
397 case ACPI_RESOURCE_NAME_IRQ:
398 /*
399 * IRQ Resource:
400 * Get the number of bits set in the 16-bit IRQ mask
401 */
402 ACPI_MOVE_16_TO_16(&temp16, buffer);
403 extra_struct_bytes = acpi_rs_count_set_bits(temp16);
404 break;
405
406 case ACPI_RESOURCE_NAME_DMA:
407 /*
408 * DMA Resource:
409 * Get the number of bits set in the 8-bit DMA mask
410 */
411 extra_struct_bytes = acpi_rs_count_set_bits(*buffer);
412 break;
413
414 case ACPI_RESOURCE_NAME_VENDOR_SMALL:
415 case ACPI_RESOURCE_NAME_VENDOR_LARGE:
416 /*
417 * Vendor Resource:
418 * Get the number of vendor data bytes
419 */
420 extra_struct_bytes = resource_length;
421 break;
422
423 case ACPI_RESOURCE_NAME_END_TAG:
424 /*
425 * End Tag:
426 * This is the normal exit, add size of end_tag
427 */
428 *size_needed += ACPI_RS_SIZE_MIN;
429 return_ACPI_STATUS(AE_OK);
430
431 case ACPI_RESOURCE_NAME_ADDRESS32:
432 case ACPI_RESOURCE_NAME_ADDRESS16:
433 case ACPI_RESOURCE_NAME_ADDRESS64:
434 /*
435 * Address Resource:
436 * Add the size of the optional resource_source
437 */
438 extra_struct_bytes =
439 acpi_rs_stream_option_length(resource_length,
440 minimum_aml_resource_length);
441 break;
442
443 case ACPI_RESOURCE_NAME_EXTENDED_IRQ:
444 /*
445 * Extended IRQ Resource:
446 * Using the interrupt_table_length, add 4 bytes for each additional
447 * interrupt. Note: at least one interrupt is required and is
448 * included in the minimum descriptor size (reason for the -1)
449 */
450 extra_struct_bytes = (buffer[1] - 1) * sizeof(u32);
451
452 /* Add the size of the optional resource_source */
453
454 extra_struct_bytes +=
455 acpi_rs_stream_option_length(resource_length -
456 extra_struct_bytes,
457 minimum_aml_resource_length);
458 break;
459
460 default:
461 break;
462 }
463
464 /*
465 * Update the required buffer size for the internal descriptor structs
466 *
467 * Important: Round the size up for the appropriate alignment. This
468 * is a requirement on IA64.
469 */
470 buffer_size = acpi_gbl_resource_struct_sizes[resource_index] +
471 extra_struct_bytes;
472 buffer_size = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(buffer_size);
473
474 *size_needed += buffer_size;
475
476 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
477 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
478 acpi_ut_get_resource_type(aml_buffer),
479 acpi_ut_get_descriptor_length(aml_buffer),
480 buffer_size));
481
482 /*
483 * Point to the next resource within the AML stream using the length
484 * contained in the resource descriptor header
485 */
486 aml_buffer += acpi_ut_get_descriptor_length(aml_buffer);
487 }
488
489 /* Did not find an end_tag resource descriptor */
490
491 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
492 }
493
494 /*******************************************************************************
495 *
496 * FUNCTION: acpi_rs_get_pci_routing_table_length
497 *
498 * PARAMETERS: package_object - Pointer to the package object
499 * buffer_size_needed - u32 pointer of the size buffer
500 * needed to properly return the
501 * parsed data
502 *
503 * RETURN: Status
504 *
505 * DESCRIPTION: Given a package representing a PCI routing table, this
506 * calculates the size of the corresponding linked list of
507 * descriptions.
508 *
509 ******************************************************************************/
510
511 acpi_status
512 acpi_rs_get_pci_routing_table_length(union acpi_operand_object *package_object,
513 acpi_size * buffer_size_needed)
514 {
515 u32 number_of_elements;
516 acpi_size temp_size_needed = 0;
517 union acpi_operand_object **top_object_list;
518 u32 index;
519 union acpi_operand_object *package_element;
520 union acpi_operand_object **sub_object_list;
521 u8 name_found;
522 u32 table_index;
523
524 ACPI_FUNCTION_TRACE(rs_get_pci_routing_table_length);
525
526 number_of_elements = package_object->package.count;
527
528 /*
529 * Calculate the size of the return buffer.
530 * The base size is the number of elements * the sizes of the
531 * structures. Additional space for the strings is added below.
532 * The minus one is to subtract the size of the u8 Source[1]
533 * member because it is added below.
534 *
535 * But each PRT_ENTRY structure has a pointer to a string and
536 * the size of that string must be found.
537 */
538 top_object_list = package_object->package.elements;
539
540 for (index = 0; index < number_of_elements; index++) {
541
542 /* Dereference the sub-package */
543
544 package_element = *top_object_list;
545
546 /* We must have a valid Package object */
547
548 if (!package_element ||
549 (package_element->common.type != ACPI_TYPE_PACKAGE)) {
550 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
551 }
552
553 /*
554 * The sub_object_list will now point to an array of the
555 * four IRQ elements: Address, Pin, Source and source_index
556 */
557 sub_object_list = package_element->package.elements;
558
559 /* Scan the irq_table_elements for the Source Name String */
560
561 name_found = FALSE;
562
563 for (table_index = 0; table_index < 4 && !name_found;
564 table_index++) {
565 if (*sub_object_list && /* Null object allowed */
566 ((ACPI_TYPE_STRING ==
567 (*sub_object_list)->common.type) ||
568 ((ACPI_TYPE_LOCAL_REFERENCE ==
569 (*sub_object_list)->common.type) &&
570 ((*sub_object_list)->reference.class ==
571 ACPI_REFCLASS_NAME)))) {
572 name_found = TRUE;
573 } else {
574 /* Look at the next element */
575
576 sub_object_list++;
577 }
578 }
579
580 temp_size_needed += (sizeof(struct acpi_pci_routing_table) - 4);
581
582 /* Was a String type found? */
583
584 if (name_found) {
585 if ((*sub_object_list)->common.type == ACPI_TYPE_STRING) {
586 /*
587 * The length String.Length field does not include the
588 * terminating NULL, add 1
589 */
590 temp_size_needed += ((acpi_size)
591 (*sub_object_list)->string.
592 length + 1);
593 } else {
594 temp_size_needed +=
595 acpi_ns_get_pathname_length((*sub_object_list)->reference.node);
596 }
597 } else {
598 /*
599 * If no name was found, then this is a NULL, which is
600 * translated as a u32 zero.
601 */
602 temp_size_needed += sizeof(u32);
603 }
604
605 /* Round up the size since each element must be aligned */
606
607 temp_size_needed = ACPI_ROUND_UP_TO_64BIT(temp_size_needed);
608
609 /* Point to the next union acpi_operand_object */
610
611 top_object_list++;
612 }
613
614 /*
615 * Add an extra element to the end of the list, essentially a
616 * NULL terminator
617 */
618 *buffer_size_needed =
619 temp_size_needed + sizeof(struct acpi_pci_routing_table);
620 return_ACPI_STATUS(AE_OK);
621 }
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