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On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / drivers / acpi / acpica / evgpeblk.c
bloba60aaa7635f36857777acdc3fd906246c4da56ec
1 /******************************************************************************
2 *
3 * Module Name: evgpeblk - GPE block creation and initialization.
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2008, 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 "acevents.h"
47 #include "acnamesp.h"
48
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evgpeblk")
51
52 /* Local prototypes */
53 static acpi_status
54 acpi_ev_save_method_info(acpi_handle obj_handle,
55 u32 level, void *obj_desc, void **return_value);
56
57 static acpi_status
58 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
59 u32 level, void *info, void **return_value);
60
61 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
62 interrupt_number);
63
64 static acpi_status
65 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt);
66
67 static acpi_status
68 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
69 u32 interrupt_number);
70
71 static acpi_status
72 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block);
73
74 /*******************************************************************************
75 *
76 * FUNCTION: acpi_ev_valid_gpe_event
77 *
78 * PARAMETERS: gpe_event_info - Info for this GPE
79 *
80 * RETURN: TRUE if the gpe_event is valid
81 *
82 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL.
83 * Should be called only when the GPE lists are semaphore locked
84 * and not subject to change.
85 *
86 ******************************************************************************/
87
88 u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
89 {
90 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
91 struct acpi_gpe_block_info *gpe_block;
92
93 ACPI_FUNCTION_ENTRY();
94
95 /* No need for spin lock since we are not changing any list elements */
96
97 /* Walk the GPE interrupt levels */
98
99 gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head;
100 while (gpe_xrupt_block) {
101 gpe_block = gpe_xrupt_block->gpe_block_list_head;
102
103 /* Walk the GPE blocks on this interrupt level */
104
105 while (gpe_block) {
106 if ((&gpe_block->event_info[0] <= gpe_event_info) &&
107 (&gpe_block->event_info[((acpi_size)
108 gpe_block->
109 register_count) * 8] >
110 gpe_event_info)) {
111 return (TRUE);
112 }
113
114 gpe_block = gpe_block->next;
115 }
116
117 gpe_xrupt_block = gpe_xrupt_block->next;
118 }
119
120 return (FALSE);
121 }
122
123 /*******************************************************************************
124 *
125 * FUNCTION: acpi_ev_walk_gpe_list
126 *
127 * PARAMETERS: gpe_walk_callback - Routine called for each GPE block
128 * Context - Value passed to callback
129 *
130 * RETURN: Status
131 *
132 * DESCRIPTION: Walk the GPE lists.
133 *
134 ******************************************************************************/
135
136 acpi_status
137 acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
138 {
139 struct acpi_gpe_block_info *gpe_block;
140 struct acpi_gpe_xrupt_info *gpe_xrupt_info;
141 acpi_status status = AE_OK;
142 acpi_cpu_flags flags;
143
144 ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
145
146 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
147
148 /* Walk the interrupt level descriptor list */
149
150 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
151 while (gpe_xrupt_info) {
152
153 /* Walk all Gpe Blocks attached to this interrupt level */
154
155 gpe_block = gpe_xrupt_info->gpe_block_list_head;
156 while (gpe_block) {
157
158 /* One callback per GPE block */
159
160 status =
161 gpe_walk_callback(gpe_xrupt_info, gpe_block,
162 context);
163 if (ACPI_FAILURE(status)) {
164 if (status == AE_CTRL_END) { /* Callback abort */
165 status = AE_OK;
166 }
167 goto unlock_and_exit;
168 }
169
170 gpe_block = gpe_block->next;
171 }
172
173 gpe_xrupt_info = gpe_xrupt_info->next;
174 }
175
176 unlock_and_exit:
177 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
178 return_ACPI_STATUS(status);
179 }
180
181 /*******************************************************************************
182 *
183 * FUNCTION: acpi_ev_delete_gpe_handlers
184 *
185 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
186 * gpe_block - Gpe Block info
187 *
188 * RETURN: Status
189 *
190 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
191 * Used only prior to termination.
192 *
193 ******************************************************************************/
194
195 acpi_status
196 acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
197 struct acpi_gpe_block_info *gpe_block,
198 void *context)
199 {
200 struct acpi_gpe_event_info *gpe_event_info;
201 u32 i;
202 u32 j;
203
204 ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
205
206 /* Examine each GPE Register within the block */
207
208 for (i = 0; i < gpe_block->register_count; i++) {
209
210 /* Now look at the individual GPEs in this byte register */
211
212 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
213 gpe_event_info = &gpe_block->event_info[((acpi_size) i *
214 ACPI_GPE_REGISTER_WIDTH)
215 + j];
216
217 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
218 ACPI_GPE_DISPATCH_HANDLER) {
219 ACPI_FREE(gpe_event_info->dispatch.handler);
220 gpe_event_info->dispatch.handler = NULL;
221 gpe_event_info->flags &=
222 ~ACPI_GPE_DISPATCH_MASK;
223 }
224 }
225 }
226
227 return_ACPI_STATUS(AE_OK);
228 }
229
230 /*******************************************************************************
231 *
232 * FUNCTION: acpi_ev_save_method_info
233 *
234 * PARAMETERS: Callback from walk_namespace
235 *
236 * RETURN: Status
237 *
238 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
239 * control method under the _GPE portion of the namespace.
240 * Extract the name and GPE type from the object, saving this
241 * information for quick lookup during GPE dispatch
242 *
243 * The name of each GPE control method is of the form:
244 * "_Lxx" or "_Exx"
245 * Where:
246 * L - means that the GPE is level triggered
247 * E - means that the GPE is edge triggered
248 * xx - is the GPE number [in HEX]
249 *
250 ******************************************************************************/
251
252 static acpi_status
253 acpi_ev_save_method_info(acpi_handle obj_handle,
254 u32 level, void *obj_desc, void **return_value)
255 {
256 struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
257 struct acpi_gpe_event_info *gpe_event_info;
258 u32 gpe_number;
259 char name[ACPI_NAME_SIZE + 1];
260 u8 type;
261 acpi_status status;
262
263 ACPI_FUNCTION_TRACE(ev_save_method_info);
264
265 /*
266 * _Lxx and _Exx GPE method support
267 *
268 * 1) Extract the name from the object and convert to a string
269 */
270 ACPI_MOVE_32_TO_32(name,
271 &((struct acpi_namespace_node *)obj_handle)->name.
272 integer);
273 name[ACPI_NAME_SIZE] = 0;
274
275 /*
276 * 2) Edge/Level determination is based on the 2nd character
277 * of the method name
278 *
279 * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
280 * if a _PRW object is found that points to this GPE.
281 */
282 switch (name[1]) {
283 case 'L':
284 type = ACPI_GPE_LEVEL_TRIGGERED;
285 break;
286
287 case 'E':
288 type = ACPI_GPE_EDGE_TRIGGERED;
289 break;
290
291 default:
292 /* Unknown method type, just ignore it! */
293
294 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
295 "Ignoring unknown GPE method type: %s "
296 "(name not of form _Lxx or _Exx)", name));
297 return_ACPI_STATUS(AE_OK);
298 }
299
300 /* Convert the last two characters of the name to the GPE Number */
301
302 gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
303 if (gpe_number == ACPI_UINT32_MAX) {
304
305 /* Conversion failed; invalid method, just ignore it */
306
307 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
308 "Could not extract GPE number from name: %s "
309 "(name is not of form _Lxx or _Exx)", name));
310 return_ACPI_STATUS(AE_OK);
311 }
312
313 /* Ensure that we have a valid GPE number for this GPE block */
314
315 if ((gpe_number < gpe_block->block_base_number) ||
316 (gpe_number >= (gpe_block->block_base_number +
317 (gpe_block->register_count * 8)))) {
318 /*
319 * Not valid for this GPE block, just ignore it. However, it may be
320 * valid for a different GPE block, since GPE0 and GPE1 methods both
321 * appear under \_GPE.
322 */
323 return_ACPI_STATUS(AE_OK);
324 }
325
326 /*
327 * Now we can add this information to the gpe_event_info block for use
328 * during dispatch of this GPE. Default type is RUNTIME, although this may
329 * change when the _PRW methods are executed later.
330 */
331 gpe_event_info =
332 &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
333
334 gpe_event_info->flags = (u8)
335 (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
336
337 gpe_event_info->dispatch.method_node =
338 (struct acpi_namespace_node *)obj_handle;
339
340 /* Update enable mask, but don't enable the HW GPE as of yet */
341
342 status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
343
344 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
345 "Registered GPE method %s as GPE number 0x%.2X\n",
346 name, gpe_number));
347 return_ACPI_STATUS(status);
348 }
349
350 /*******************************************************************************
351 *
352 * FUNCTION: acpi_ev_match_prw_and_gpe
353 *
354 * PARAMETERS: Callback from walk_namespace
355 *
356 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is
357 * not aborted on a single _PRW failure.
358 *
359 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
360 * Device. Run the _PRW method. If present, extract the GPE
361 * number and mark the GPE as a WAKE GPE.
362 *
363 ******************************************************************************/
364
365 static acpi_status
366 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
367 u32 level, void *info, void **return_value)
368 {
369 struct acpi_gpe_walk_info *gpe_info = (void *)info;
370 struct acpi_namespace_node *gpe_device;
371 struct acpi_gpe_block_info *gpe_block;
372 struct acpi_namespace_node *target_gpe_device;
373 struct acpi_gpe_event_info *gpe_event_info;
374 union acpi_operand_object *pkg_desc;
375 union acpi_operand_object *obj_desc;
376 u32 gpe_number;
377 acpi_status status;
378
379 ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
380
381 /* Check for a _PRW method under this device */
382
383 status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
384 ACPI_BTYPE_PACKAGE, &pkg_desc);
385 if (ACPI_FAILURE(status)) {
386
387 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
388
389 return_ACPI_STATUS(AE_OK);
390 }
391
392 /* The returned _PRW package must have at least two elements */
393
394 if (pkg_desc->package.count < 2) {
395 goto cleanup;
396 }
397
398 /* Extract pointers from the input context */
399
400 gpe_device = gpe_info->gpe_device;
401 gpe_block = gpe_info->gpe_block;
402
403 /*
404 * The _PRW object must return a package, we are only interested in the
405 * first element
406 */
407 obj_desc = pkg_desc->package.elements[0];
408
409 if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
410
411 /* Use FADT-defined GPE device (from definition of _PRW) */
412
413 target_gpe_device = acpi_gbl_fadt_gpe_device;
414
415 /* Integer is the GPE number in the FADT described GPE blocks */
416
417 gpe_number = (u32) obj_desc->integer.value;
418 } else if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
419
420 /* Package contains a GPE reference and GPE number within a GPE block */
421
422 if ((obj_desc->package.count < 2) ||
423 ((obj_desc->package.elements[0])->common.type !=
424 ACPI_TYPE_LOCAL_REFERENCE) ||
425 ((obj_desc->package.elements[1])->common.type !=
426 ACPI_TYPE_INTEGER)) {
427 goto cleanup;
428 }
429
430 /* Get GPE block reference and decode */
431
432 target_gpe_device =
433 obj_desc->package.elements[0]->reference.node;
434 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
435 } else {
436 /* Unknown type, just ignore it */
437
438 goto cleanup;
439 }
440
441 /*
442 * Is this GPE within this block?
443 *
444 * TRUE if and only if these conditions are true:
445 * 1) The GPE devices match.
446 * 2) The GPE index(number) is within the range of the Gpe Block
447 * associated with the GPE device.
448 */
449 if ((gpe_device == target_gpe_device) &&
450 (gpe_number >= gpe_block->block_base_number) &&
451 (gpe_number < gpe_block->block_base_number +
452 (gpe_block->register_count * 8))) {
453 gpe_event_info = &gpe_block->event_info[gpe_number -
454 gpe_block->
455 block_base_number];
456
457 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
458
459 gpe_event_info->flags &=
460 ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
461
462 status =
463 acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
464 if (ACPI_FAILURE(status)) {
465 goto cleanup;
466 }
467
468 status =
469 acpi_ev_update_gpe_enable_masks(gpe_event_info,
470 ACPI_GPE_DISABLE);
471 }
472
473 cleanup:
474 acpi_ut_remove_reference(pkg_desc);
475 return_ACPI_STATUS(AE_OK);
476 }
477
478 /*******************************************************************************
479 *
480 * FUNCTION: acpi_ev_get_gpe_xrupt_block
481 *
482 * PARAMETERS: interrupt_number - Interrupt for a GPE block
483 *
484 * RETURN: A GPE interrupt block
485 *
486 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
487 * block per unique interrupt level used for GPEs. Should be
488 * called only when the GPE lists are semaphore locked and not
489 * subject to change.
490 *
491 ******************************************************************************/
492
493 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
494 interrupt_number)
495 {
496 struct acpi_gpe_xrupt_info *next_gpe_xrupt;
497 struct acpi_gpe_xrupt_info *gpe_xrupt;
498 acpi_status status;
499 acpi_cpu_flags flags;
500
501 ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
502
503 /* No need for lock since we are not changing any list elements here */
504
505 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
506 while (next_gpe_xrupt) {
507 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
508 return_PTR(next_gpe_xrupt);
509 }
510
511 next_gpe_xrupt = next_gpe_xrupt->next;
512 }
513
514 /* Not found, must allocate a new xrupt descriptor */
515
516 gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
517 if (!gpe_xrupt) {
518 return_PTR(NULL);
519 }
520
521 gpe_xrupt->interrupt_number = interrupt_number;
522
523 /* Install new interrupt descriptor with spin lock */
524
525 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
526 if (acpi_gbl_gpe_xrupt_list_head) {
527 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
528 while (next_gpe_xrupt->next) {
529 next_gpe_xrupt = next_gpe_xrupt->next;
530 }
531
532 next_gpe_xrupt->next = gpe_xrupt;
533 gpe_xrupt->previous = next_gpe_xrupt;
534 } else {
535 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
536 }
537 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
538
539 /* Install new interrupt handler if not SCI_INT */
540
541 if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
542 status = acpi_os_install_interrupt_handler(interrupt_number,
543 acpi_ev_gpe_xrupt_handler,
544 gpe_xrupt);
545 if (ACPI_FAILURE(status)) {
546 ACPI_ERROR((AE_INFO,
547 "Could not install GPE interrupt handler at level 0x%X",
548 interrupt_number));
549 return_PTR(NULL);
550 }
551 }
552
553 return_PTR(gpe_xrupt);
554 }
555
556 /*******************************************************************************
557 *
558 * FUNCTION: acpi_ev_delete_gpe_xrupt
559 *
560 * PARAMETERS: gpe_xrupt - A GPE interrupt info block
561 *
562 * RETURN: Status
563 *
564 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
565 * interrupt handler if not the SCI interrupt.
566 *
567 ******************************************************************************/
568
569 static acpi_status
570 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
571 {
572 acpi_status status;
573 acpi_cpu_flags flags;
574
575 ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
576
577 /* We never want to remove the SCI interrupt handler */
578
579 if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
580 gpe_xrupt->gpe_block_list_head = NULL;
581 return_ACPI_STATUS(AE_OK);
582 }
583
584 /* Disable this interrupt */
585
586 status =
587 acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
588 acpi_ev_gpe_xrupt_handler);
589 if (ACPI_FAILURE(status)) {
590 return_ACPI_STATUS(status);
591 }
592
593 /* Unlink the interrupt block with lock */
594
595 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
596 if (gpe_xrupt->previous) {
597 gpe_xrupt->previous->next = gpe_xrupt->next;
598 } else {
599 /* No previous, update list head */
600
601 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
602 }
603
604 if (gpe_xrupt->next) {
605 gpe_xrupt->next->previous = gpe_xrupt->previous;
606 }
607 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
608
609 /* Free the block */
610
611 ACPI_FREE(gpe_xrupt);
612 return_ACPI_STATUS(AE_OK);
613 }
614
615 /*******************************************************************************
616 *
617 * FUNCTION: acpi_ev_install_gpe_block
618 *
619 * PARAMETERS: gpe_block - New GPE block
620 * interrupt_number - Xrupt to be associated with this
621 * GPE block
622 *
623 * RETURN: Status
624 *
625 * DESCRIPTION: Install new GPE block with mutex support
626 *
627 ******************************************************************************/
628
629 static acpi_status
630 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
631 u32 interrupt_number)
632 {
633 struct acpi_gpe_block_info *next_gpe_block;
634 struct acpi_gpe_xrupt_info *gpe_xrupt_block;
635 acpi_status status;
636 acpi_cpu_flags flags;
637
638 ACPI_FUNCTION_TRACE(ev_install_gpe_block);
639
640 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
641 if (ACPI_FAILURE(status)) {
642 return_ACPI_STATUS(status);
643 }
644
645 gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
646 if (!gpe_xrupt_block) {
647 status = AE_NO_MEMORY;
648 goto unlock_and_exit;
649 }
650
651 /* Install the new block at the end of the list with lock */
652
653 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
654 if (gpe_xrupt_block->gpe_block_list_head) {
655 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
656 while (next_gpe_block->next) {
657 next_gpe_block = next_gpe_block->next;
658 }
659
660 next_gpe_block->next = gpe_block;
661 gpe_block->previous = next_gpe_block;
662 } else {
663 gpe_xrupt_block->gpe_block_list_head = gpe_block;
664 }
665
666 gpe_block->xrupt_block = gpe_xrupt_block;
667 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
668
669 unlock_and_exit:
670 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
671 return_ACPI_STATUS(status);
672 }
673
674 /*******************************************************************************
675 *
676 * FUNCTION: acpi_ev_delete_gpe_block
677 *
678 * PARAMETERS: gpe_block - Existing GPE block
679 *
680 * RETURN: Status
681 *
682 * DESCRIPTION: Remove a GPE block
683 *
684 ******************************************************************************/
685
686 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
687 {
688 acpi_status status;
689 acpi_cpu_flags flags;
690
691 ACPI_FUNCTION_TRACE(ev_install_gpe_block);
692
693 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
694 if (ACPI_FAILURE(status)) {
695 return_ACPI_STATUS(status);
696 }
697
698 /* Disable all GPEs in this block */
699
700 status =
701 acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
702
703 if (!gpe_block->previous && !gpe_block->next) {
704
705 /* This is the last gpe_block on this interrupt */
706
707 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
708 if (ACPI_FAILURE(status)) {
709 goto unlock_and_exit;
710 }
711 } else {
712 /* Remove the block on this interrupt with lock */
713
714 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
715 if (gpe_block->previous) {
716 gpe_block->previous->next = gpe_block->next;
717 } else {
718 gpe_block->xrupt_block->gpe_block_list_head =
719 gpe_block->next;
720 }
721
722 if (gpe_block->next) {
723 gpe_block->next->previous = gpe_block->previous;
724 }
725 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
726 }
727
728 acpi_current_gpe_count -=
729 gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH;
730
731 /* Free the gpe_block */
732
733 ACPI_FREE(gpe_block->register_info);
734 ACPI_FREE(gpe_block->event_info);
735 ACPI_FREE(gpe_block);
736
737 unlock_and_exit:
738 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
739 return_ACPI_STATUS(status);
740 }
741
742 /*******************************************************************************
743 *
744 * FUNCTION: acpi_ev_create_gpe_info_blocks
745 *
746 * PARAMETERS: gpe_block - New GPE block
747 *
748 * RETURN: Status
749 *
750 * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
751 *
752 ******************************************************************************/
753
754 static acpi_status
755 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
756 {
757 struct acpi_gpe_register_info *gpe_register_info = NULL;
758 struct acpi_gpe_event_info *gpe_event_info = NULL;
759 struct acpi_gpe_event_info *this_event;
760 struct acpi_gpe_register_info *this_register;
761 u32 i;
762 u32 j;
763 acpi_status status;
764
765 ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
766
767 /* Allocate the GPE register information block */
768
769 gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
770 register_count *
771 sizeof(struct
772 acpi_gpe_register_info));
773 if (!gpe_register_info) {
774 ACPI_ERROR((AE_INFO,
775 "Could not allocate the GpeRegisterInfo table"));
776 return_ACPI_STATUS(AE_NO_MEMORY);
777 }
778
779 /*
780 * Allocate the GPE event_info block. There are eight distinct GPEs
781 * per register. Initialization to zeros is sufficient.
782 */
783 gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
784 register_count *
785 ACPI_GPE_REGISTER_WIDTH) *
786 sizeof(struct
787 acpi_gpe_event_info));
788 if (!gpe_event_info) {
789 ACPI_ERROR((AE_INFO,
790 "Could not allocate the GpeEventInfo table"));
791 status = AE_NO_MEMORY;
792 goto error_exit;
793 }
794
795 /* Save the new Info arrays in the GPE block */
796
797 gpe_block->register_info = gpe_register_info;
798 gpe_block->event_info = gpe_event_info;
799
800 /*
801 * Initialize the GPE Register and Event structures. A goal of these
802 * tables is to hide the fact that there are two separate GPE register
803 * sets in a given GPE hardware block, the status registers occupy the
804 * first half, and the enable registers occupy the second half.
805 */
806 this_register = gpe_register_info;
807 this_event = gpe_event_info;
808
809 for (i = 0; i < gpe_block->register_count; i++) {
810
811 /* Init the register_info for this GPE register (8 GPEs) */
812
813 this_register->base_gpe_number =
814 (u8) (gpe_block->block_base_number +
815 (i * ACPI_GPE_REGISTER_WIDTH));
816
817 this_register->status_address.address =
818 gpe_block->block_address.address + i;
819
820 this_register->enable_address.address =
821 gpe_block->block_address.address + i +
822 gpe_block->register_count;
823
824 this_register->status_address.space_id =
825 gpe_block->block_address.space_id;
826 this_register->enable_address.space_id =
827 gpe_block->block_address.space_id;
828 this_register->status_address.bit_width =
829 ACPI_GPE_REGISTER_WIDTH;
830 this_register->enable_address.bit_width =
831 ACPI_GPE_REGISTER_WIDTH;
832 this_register->status_address.bit_offset = 0;
833 this_register->enable_address.bit_offset = 0;
834
835 /* Init the event_info for each GPE within this register */
836
837 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
838 this_event->gpe_number =
839 (u8) (this_register->base_gpe_number + j);
840 this_event->register_info = this_register;
841 this_event++;
842 }
843
844 /* Disable all GPEs within this register */
845
846 status = acpi_hw_write(0x00, &this_register->enable_address);
847 if (ACPI_FAILURE(status)) {
848 goto error_exit;
849 }
850
851 /* Clear any pending GPE events within this register */
852
853 status = acpi_hw_write(0xFF, &this_register->status_address);
854 if (ACPI_FAILURE(status)) {
855 goto error_exit;
856 }
857
858 this_register++;
859 }
860
861 return_ACPI_STATUS(AE_OK);
862
863 error_exit:
864 if (gpe_register_info) {
865 ACPI_FREE(gpe_register_info);
866 }
867 if (gpe_event_info) {
868 ACPI_FREE(gpe_event_info);
869 }
870
871 return_ACPI_STATUS(status);
872 }
873
874 /*******************************************************************************
875 *
876 * FUNCTION: acpi_ev_create_gpe_block
877 *
878 * PARAMETERS: gpe_device - Handle to the parent GPE block
879 * gpe_block_address - Address and space_iD
880 * register_count - Number of GPE register pairs in the block
881 * gpe_block_base_number - Starting GPE number for the block
882 * interrupt_number - H/W interrupt for the block
883 * return_gpe_block - Where the new block descriptor is returned
884 *
885 * RETURN: Status
886 *
887 * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
888 * the block are disabled at exit.
889 * Note: Assumes namespace is locked.
890 *
891 ******************************************************************************/
892
893 acpi_status
894 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
895 struct acpi_generic_address *gpe_block_address,
896 u32 register_count,
897 u8 gpe_block_base_number,
898 u32 interrupt_number,
899 struct acpi_gpe_block_info **return_gpe_block)
900 {
901 acpi_status status;
902 struct acpi_gpe_block_info *gpe_block;
903
904 ACPI_FUNCTION_TRACE(ev_create_gpe_block);
905
906 if (!register_count) {
907 return_ACPI_STATUS(AE_OK);
908 }
909
910 /* Allocate a new GPE block */
911
912 gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
913 if (!gpe_block) {
914 return_ACPI_STATUS(AE_NO_MEMORY);
915 }
916
917 /* Initialize the new GPE block */
918
919 gpe_block->node = gpe_device;
920 gpe_block->register_count = register_count;
921 gpe_block->block_base_number = gpe_block_base_number;
922
923 ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
924 sizeof(struct acpi_generic_address));
925
926 /*
927 * Create the register_info and event_info sub-structures
928 * Note: disables and clears all GPEs in the block
929 */
930 status = acpi_ev_create_gpe_info_blocks(gpe_block);
931 if (ACPI_FAILURE(status)) {
932 ACPI_FREE(gpe_block);
933 return_ACPI_STATUS(status);
934 }
935
936 /* Install the new block in the global lists */
937
938 status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
939 if (ACPI_FAILURE(status)) {
940 ACPI_FREE(gpe_block);
941 return_ACPI_STATUS(status);
942 }
943
944 /* Find all GPE methods (_Lxx, _Exx) for this block */
945
946 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
947 ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
948 acpi_ev_save_method_info, gpe_block,
949 NULL);
950
951 /* Return the new block */
952
953 if (return_gpe_block) {
954 (*return_gpe_block) = gpe_block;
955 }
956
957 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
958 "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
959 (u32) gpe_block->block_base_number,
960 (u32) (gpe_block->block_base_number +
961 ((gpe_block->register_count *
962 ACPI_GPE_REGISTER_WIDTH) - 1)),
963 gpe_device->name.ascii, gpe_block->register_count,
964 interrupt_number));
965
966 /* Update global count of currently available GPEs */
967
968 acpi_current_gpe_count += register_count * ACPI_GPE_REGISTER_WIDTH;
969 return_ACPI_STATUS(AE_OK);
970 }
971
972 /*******************************************************************************
973 *
974 * FUNCTION: acpi_ev_initialize_gpe_block
975 *
976 * PARAMETERS: gpe_device - Handle to the parent GPE block
977 * gpe_block - Gpe Block info
978 *
979 * RETURN: Status
980 *
981 * DESCRIPTION: Initialize and enable a GPE block. First find and run any
982 * _PRT methods associated with the block, then enable the
983 * appropriate GPEs.
984 * Note: Assumes namespace is locked.
985 *
986 ******************************************************************************/
987
988 acpi_status
989 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
990 struct acpi_gpe_block_info *gpe_block)
991 {
992 acpi_status status;
993 struct acpi_gpe_event_info *gpe_event_info;
994 struct acpi_gpe_walk_info gpe_info;
995 u32 wake_gpe_count;
996 u32 gpe_enabled_count;
997 u32 i;
998 u32 j;
999
1000 ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
1001
1002 /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
1003
1004 if (!gpe_block) {
1005 return_ACPI_STATUS(AE_OK);
1006 }
1007
1008 /*
1009 * Runtime option: Should wake GPEs be enabled at runtime? The default
1010 * is no, they should only be enabled just as the machine goes to sleep.
1011 */
1012 if (acpi_gbl_leave_wake_gpes_disabled) {
1013 /*
1014 * Differentiate runtime vs wake GPEs, via the _PRW control methods.
1015 * Each GPE that has one or more _PRWs that reference it is by
1016 * definition a wake GPE and will not be enabled while the machine
1017 * is running.
1018 */
1019 gpe_info.gpe_block = gpe_block;
1020 gpe_info.gpe_device = gpe_device;
1021
1022 status =
1023 acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1024 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1025 acpi_ev_match_prw_and_gpe, &gpe_info,
1026 NULL);
1027 }
1028
1029 /*
1030 * Enable all GPEs in this block that have these attributes:
1031 * 1) are "runtime" or "run/wake" GPEs, and
1032 * 2) have a corresponding _Lxx or _Exx method
1033 *
1034 * Any other GPEs within this block must be enabled via the
1035 * acpi_enable_gpe() external interface.
1036 */
1037 wake_gpe_count = 0;
1038 gpe_enabled_count = 0;
1039
1040 for (i = 0; i < gpe_block->register_count; i++) {
1041 for (j = 0; j < 8; j++) {
1042
1043 /* Get the info block for this particular GPE */
1044
1045 gpe_event_info = &gpe_block->event_info[((acpi_size) i *
1046 ACPI_GPE_REGISTER_WIDTH)
1047 + j];
1048
1049 if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1050 ACPI_GPE_DISPATCH_METHOD) &&
1051 (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
1052 gpe_enabled_count++;
1053 }
1054
1055 if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1056 wake_gpe_count++;
1057 }
1058 }
1059 }
1060
1061 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1062 "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1063 wake_gpe_count, gpe_enabled_count));
1064
1065 /* Enable all valid runtime GPEs found above */
1066
1067 status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block, NULL);
1068 if (ACPI_FAILURE(status)) {
1069 ACPI_ERROR((AE_INFO, "Could not enable GPEs in GpeBlock %p",
1070 gpe_block));
1071 }
1072
1073 return_ACPI_STATUS(status);
1074 }
1075
1076 /*******************************************************************************
1077 *
1078 * FUNCTION: acpi_ev_gpe_initialize
1079 *
1080 * PARAMETERS: None
1081 *
1082 * RETURN: Status
1083 *
1084 * DESCRIPTION: Initialize the GPE data structures
1085 *
1086 ******************************************************************************/
1087
1088 acpi_status acpi_ev_gpe_initialize(void)
1089 {
1090 u32 register_count0 = 0;
1091 u32 register_count1 = 0;
1092 u32 gpe_number_max = 0;
1093 acpi_status status;
1094
1095 ACPI_FUNCTION_TRACE(ev_gpe_initialize);
1096
1097 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1098 if (ACPI_FAILURE(status)) {
1099 return_ACPI_STATUS(status);
1100 }
1101
1102 /*
1103 * Initialize the GPE Block(s) defined in the FADT
1104 *
1105 * Why the GPE register block lengths are divided by 2: From the ACPI
1106 * Spec, section "General-Purpose Event Registers", we have:
1107 *
1108 * "Each register block contains two registers of equal length
1109 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1110 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1111 * The length of the GPE1_STS and GPE1_EN registers is equal to
1112 * half the GPE1_LEN. If a generic register block is not supported
1113 * then its respective block pointer and block length values in the
1114 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1115 * to be the same size."
1116 */
1117
1118 /*
1119 * Determine the maximum GPE number for this machine.
1120 *
1121 * Note: both GPE0 and GPE1 are optional, and either can exist without
1122 * the other.
1123 *
1124 * If EITHER the register length OR the block address are zero, then that
1125 * particular block is not supported.
1126 */
1127 if (acpi_gbl_FADT.gpe0_block_length &&
1128 acpi_gbl_FADT.xgpe0_block.address) {
1129
1130 /* GPE block 0 exists (has both length and address > 0) */
1131
1132 register_count0 = (u16) (acpi_gbl_FADT.gpe0_block_length / 2);
1133
1134 gpe_number_max =
1135 (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1136
1137 /* Install GPE Block 0 */
1138
1139 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1140 &acpi_gbl_FADT.xgpe0_block,
1141 register_count0, 0,
1142 acpi_gbl_FADT.sci_interrupt,
1143 &acpi_gbl_gpe_fadt_blocks[0]);
1144
1145 if (ACPI_FAILURE(status)) {
1146 ACPI_EXCEPTION((AE_INFO, status,
1147 "Could not create GPE Block 0"));
1148 }
1149 }
1150
1151 if (acpi_gbl_FADT.gpe1_block_length &&
1152 acpi_gbl_FADT.xgpe1_block.address) {
1153
1154 /* GPE block 1 exists (has both length and address > 0) */
1155
1156 register_count1 = (u16) (acpi_gbl_FADT.gpe1_block_length / 2);
1157
1158 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1159
1160 if ((register_count0) &&
1161 (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
1162 ACPI_ERROR((AE_INFO,
1163 "GPE0 block (GPE 0 to %d) overlaps the GPE1 block "
1164 "(GPE %d to %d) - Ignoring GPE1",
1165 gpe_number_max, acpi_gbl_FADT.gpe1_base,
1166 acpi_gbl_FADT.gpe1_base +
1167 ((register_count1 *
1168 ACPI_GPE_REGISTER_WIDTH) - 1)));
1169
1170 /* Ignore GPE1 block by setting the register count to zero */
1171
1172 register_count1 = 0;
1173 } else {
1174 /* Install GPE Block 1 */
1175
1176 status =
1177 acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1178 &acpi_gbl_FADT.xgpe1_block,
1179 register_count1,
1180 acpi_gbl_FADT.gpe1_base,
1181 acpi_gbl_FADT.
1182 sci_interrupt,
1183 &acpi_gbl_gpe_fadt_blocks
1184 [1]);
1185
1186 if (ACPI_FAILURE(status)) {
1187 ACPI_EXCEPTION((AE_INFO, status,
1188 "Could not create GPE Block 1"));
1189 }
1190
1191 /*
1192 * GPE0 and GPE1 do not have to be contiguous in the GPE number
1193 * space. However, GPE0 always starts at GPE number zero.
1194 */
1195 gpe_number_max = acpi_gbl_FADT.gpe1_base +
1196 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1197 }
1198 }
1199
1200 /* Exit if there are no GPE registers */
1201
1202 if ((register_count0 + register_count1) == 0) {
1203
1204 /* GPEs are not required by ACPI, this is OK */
1205
1206 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1207 "There are no GPE blocks defined in the FADT\n"));
1208 status = AE_OK;
1209 goto cleanup;
1210 }
1211
1212 /* Check for Max GPE number out-of-range */
1213
1214 if (gpe_number_max > ACPI_GPE_MAX) {
1215 ACPI_ERROR((AE_INFO,
1216 "Maximum GPE number from FADT is too large: 0x%X",
1217 gpe_number_max));
1218 status = AE_BAD_VALUE;
1219 goto cleanup;
1220 }
1221
1222 cleanup:
1223 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1224 return_ACPI_STATUS(AE_OK);
1225 }
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