Merge branch 'linus' into x86/setup-lzma
[linux-2.6] / drivers / acpi / acpica / evgpeblk.c
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->
108                              event_info[((acpi_size) 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 =
214                             &gpe_block->
215                             event_info[((acpi_size) i *
216                                         ACPI_GPE_REGISTER_WIDTH) + j];
217
218                         if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
219                             ACPI_GPE_DISPATCH_HANDLER) {
220                                 ACPI_FREE(gpe_event_info->dispatch.handler);
221                                 gpe_event_info->dispatch.handler = NULL;
222                                 gpe_event_info->flags &=
223                                     ~ACPI_GPE_DISPATCH_MASK;
224                         }
225                 }
226         }
227
228         return_ACPI_STATUS(AE_OK);
229 }
230
231 /*******************************************************************************
232  *
233  * FUNCTION:    acpi_ev_save_method_info
234  *
235  * PARAMETERS:  Callback from walk_namespace
236  *
237  * RETURN:      Status
238  *
239  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
240  *              control method under the _GPE portion of the namespace.
241  *              Extract the name and GPE type from the object, saving this
242  *              information for quick lookup during GPE dispatch
243  *
244  *              The name of each GPE control method is of the form:
245  *              "_Lxx" or "_Exx"
246  *              Where:
247  *                  L      - means that the GPE is level triggered
248  *                  E      - means that the GPE is edge triggered
249  *                  xx     - is the GPE number [in HEX]
250  *
251  ******************************************************************************/
252
253 static acpi_status
254 acpi_ev_save_method_info(acpi_handle obj_handle,
255                          u32 level, void *obj_desc, void **return_value)
256 {
257         struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
258         struct acpi_gpe_event_info *gpe_event_info;
259         u32 gpe_number;
260         char name[ACPI_NAME_SIZE + 1];
261         u8 type;
262         acpi_status status;
263
264         ACPI_FUNCTION_TRACE(ev_save_method_info);
265
266         /*
267          * _Lxx and _Exx GPE method support
268          *
269          * 1) Extract the name from the object and convert to a string
270          */
271         ACPI_MOVE_32_TO_32(name,
272                            &((struct acpi_namespace_node *)obj_handle)->name.
273                            integer);
274         name[ACPI_NAME_SIZE] = 0;
275
276         /*
277          * 2) Edge/Level determination is based on the 2nd character
278          *    of the method name
279          *
280          * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
281          * if a _PRW object is found that points to this GPE.
282          */
283         switch (name[1]) {
284         case 'L':
285                 type = ACPI_GPE_LEVEL_TRIGGERED;
286                 break;
287
288         case 'E':
289                 type = ACPI_GPE_EDGE_TRIGGERED;
290                 break;
291
292         default:
293                 /* Unknown method type, just ignore it! */
294
295                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
296                                   "Ignoring unknown GPE method type: %s (name not of form _Lxx or _Exx)",
297                                   name));
298                 return_ACPI_STATUS(AE_OK);
299         }
300
301         /* Convert the last two characters of the name to the GPE Number */
302
303         gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
304         if (gpe_number == ACPI_UINT32_MAX) {
305
306                 /* Conversion failed; invalid method, just ignore it */
307
308                 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
309                                   "Could not extract GPE number from name: %s (name is not of form _Lxx or _Exx)",
310                                   name));
311                 return_ACPI_STATUS(AE_OK);
312         }
313
314         /* Ensure that we have a valid GPE number for this GPE block */
315
316         if ((gpe_number < gpe_block->block_base_number) ||
317             (gpe_number >=
318              (gpe_block->block_base_number +
319               (gpe_block->register_count * 8)))) {
320                 /*
321                  * Not valid for this GPE block, just ignore it. However, it may be
322                  * valid for a different GPE block, since GPE0 and GPE1 methods both
323                  * appear under \_GPE.
324                  */
325                 return_ACPI_STATUS(AE_OK);
326         }
327
328         /*
329          * Now we can add this information to the gpe_event_info block for use
330          * during dispatch of this GPE. Default type is RUNTIME, although this may
331          * change when the _PRW methods are executed later.
332          */
333         gpe_event_info =
334             &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
335
336         gpe_event_info->flags = (u8)
337             (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
338
339         gpe_event_info->dispatch.method_node =
340             (struct acpi_namespace_node *)obj_handle;
341
342         /* Update enable mask, but don't enable the HW GPE as of yet */
343
344         status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
345
346         ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
347                           "Registered GPE method %s as GPE number 0x%.2X\n",
348                           name, gpe_number));
349         return_ACPI_STATUS(status);
350 }
351
352 /*******************************************************************************
353  *
354  * FUNCTION:    acpi_ev_match_prw_and_gpe
355  *
356  * PARAMETERS:  Callback from walk_namespace
357  *
358  * RETURN:      Status. NOTE: We ignore errors so that the _PRW walk is
359  *              not aborted on a single _PRW failure.
360  *
361  * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
362  *              Device. Run the _PRW method. If present, extract the GPE
363  *              number and mark the GPE as a WAKE GPE.
364  *
365  ******************************************************************************/
366
367 static acpi_status
368 acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
369                           u32 level, void *info, void **return_value)
370 {
371         struct acpi_gpe_walk_info *gpe_info = (void *)info;
372         struct acpi_namespace_node *gpe_device;
373         struct acpi_gpe_block_info *gpe_block;
374         struct acpi_namespace_node *target_gpe_device;
375         struct acpi_gpe_event_info *gpe_event_info;
376         union acpi_operand_object *pkg_desc;
377         union acpi_operand_object *obj_desc;
378         u32 gpe_number;
379         acpi_status status;
380
381         ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
382
383         /* Check for a _PRW method under this device */
384
385         status = acpi_ut_evaluate_object(obj_handle, METHOD_NAME__PRW,
386                                          ACPI_BTYPE_PACKAGE, &pkg_desc);
387         if (ACPI_FAILURE(status)) {
388
389                 /* Ignore all errors from _PRW, we don't want to abort the subsystem */
390
391                 return_ACPI_STATUS(AE_OK);
392         }
393
394         /* The returned _PRW package must have at least two elements */
395
396         if (pkg_desc->package.count < 2) {
397                 goto cleanup;
398         }
399
400         /* Extract pointers from the input context */
401
402         gpe_device = gpe_info->gpe_device;
403         gpe_block = gpe_info->gpe_block;
404
405         /*
406          * The _PRW object must return a package, we are only interested in the
407          * first element
408          */
409         obj_desc = pkg_desc->package.elements[0];
410
411         if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_INTEGER) {
412
413                 /* Use FADT-defined GPE device (from definition of _PRW) */
414
415                 target_gpe_device = acpi_gbl_fadt_gpe_device;
416
417                 /* Integer is the GPE number in the FADT described GPE blocks */
418
419                 gpe_number = (u32) obj_desc->integer.value;
420         } else if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_PACKAGE) {
421
422                 /* Package contains a GPE reference and GPE number within a GPE block */
423
424                 if ((obj_desc->package.count < 2) ||
425                     (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[0]) !=
426                      ACPI_TYPE_LOCAL_REFERENCE)
427                     || (ACPI_GET_OBJECT_TYPE(obj_desc->package.elements[1]) !=
428                         ACPI_TYPE_INTEGER)) {
429                         goto cleanup;
430                 }
431
432                 /* Get GPE block reference and decode */
433
434                 target_gpe_device =
435                     obj_desc->package.elements[0]->reference.node;
436                 gpe_number = (u32) obj_desc->package.elements[1]->integer.value;
437         } else {
438                 /* Unknown type, just ignore it */
439
440                 goto cleanup;
441         }
442
443         /*
444          * Is this GPE within this block?
445          *
446          * TRUE if and only if these conditions are true:
447          *     1) The GPE devices match.
448          *     2) The GPE index(number) is within the range of the Gpe Block
449          *          associated with the GPE device.
450          */
451         if ((gpe_device == target_gpe_device) &&
452             (gpe_number >= gpe_block->block_base_number) &&
453             (gpe_number <
454              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
455                 gpe_event_info =
456                     &gpe_block->event_info[gpe_number -
457                                            gpe_block->block_base_number];
458
459                 /* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
460
461                 gpe_event_info->flags &=
462                     ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
463
464                 status =
465                     acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
466                 if (ACPI_FAILURE(status)) {
467                         goto cleanup;
468                 }
469
470                 status =
471                     acpi_ev_update_gpe_enable_masks(gpe_event_info,
472                                                     ACPI_GPE_DISABLE);
473         }
474
475       cleanup:
476         acpi_ut_remove_reference(pkg_desc);
477         return_ACPI_STATUS(AE_OK);
478 }
479
480 /*******************************************************************************
481  *
482  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
483  *
484  * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
485  *
486  * RETURN:      A GPE interrupt block
487  *
488  * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
489  *              block per unique interrupt level used for GPEs. Should be
490  *              called only when the GPE lists are semaphore locked and not
491  *              subject to change.
492  *
493  ******************************************************************************/
494
495 static struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32
496                                                                interrupt_number)
497 {
498         struct acpi_gpe_xrupt_info *next_gpe_xrupt;
499         struct acpi_gpe_xrupt_info *gpe_xrupt;
500         acpi_status status;
501         acpi_cpu_flags flags;
502
503         ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
504
505         /* No need for lock since we are not changing any list elements here */
506
507         next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
508         while (next_gpe_xrupt) {
509                 if (next_gpe_xrupt->interrupt_number == interrupt_number) {
510                         return_PTR(next_gpe_xrupt);
511                 }
512
513                 next_gpe_xrupt = next_gpe_xrupt->next;
514         }
515
516         /* Not found, must allocate a new xrupt descriptor */
517
518         gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
519         if (!gpe_xrupt) {
520                 return_PTR(NULL);
521         }
522
523         gpe_xrupt->interrupt_number = interrupt_number;
524
525         /* Install new interrupt descriptor with spin lock */
526
527         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
528         if (acpi_gbl_gpe_xrupt_list_head) {
529                 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
530                 while (next_gpe_xrupt->next) {
531                         next_gpe_xrupt = next_gpe_xrupt->next;
532                 }
533
534                 next_gpe_xrupt->next = gpe_xrupt;
535                 gpe_xrupt->previous = next_gpe_xrupt;
536         } else {
537                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
538         }
539         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
540
541         /* Install new interrupt handler if not SCI_INT */
542
543         if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
544                 status = acpi_os_install_interrupt_handler(interrupt_number,
545                                                            acpi_ev_gpe_xrupt_handler,
546                                                            gpe_xrupt);
547                 if (ACPI_FAILURE(status)) {
548                         ACPI_ERROR((AE_INFO,
549                                     "Could not install GPE interrupt handler at level 0x%X",
550                                     interrupt_number));
551                         return_PTR(NULL);
552                 }
553         }
554
555         return_PTR(gpe_xrupt);
556 }
557
558 /*******************************************************************************
559  *
560  * FUNCTION:    acpi_ev_delete_gpe_xrupt
561  *
562  * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
563  *
564  * RETURN:      Status
565  *
566  * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
567  *              interrupt handler if not the SCI interrupt.
568  *
569  ******************************************************************************/
570
571 static acpi_status
572 acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
573 {
574         acpi_status status;
575         acpi_cpu_flags flags;
576
577         ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
578
579         /* We never want to remove the SCI interrupt handler */
580
581         if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
582                 gpe_xrupt->gpe_block_list_head = NULL;
583                 return_ACPI_STATUS(AE_OK);
584         }
585
586         /* Disable this interrupt */
587
588         status =
589             acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
590                                              acpi_ev_gpe_xrupt_handler);
591         if (ACPI_FAILURE(status)) {
592                 return_ACPI_STATUS(status);
593         }
594
595         /* Unlink the interrupt block with lock */
596
597         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
598         if (gpe_xrupt->previous) {
599                 gpe_xrupt->previous->next = gpe_xrupt->next;
600         } else {
601                 /* No previous, update list head */
602
603                 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
604         }
605
606         if (gpe_xrupt->next) {
607                 gpe_xrupt->next->previous = gpe_xrupt->previous;
608         }
609         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
610
611         /* Free the block */
612
613         ACPI_FREE(gpe_xrupt);
614         return_ACPI_STATUS(AE_OK);
615 }
616
617 /*******************************************************************************
618  *
619  * FUNCTION:    acpi_ev_install_gpe_block
620  *
621  * PARAMETERS:  gpe_block               - New GPE block
622  *              interrupt_number        - Xrupt to be associated with this
623  *                                        GPE block
624  *
625  * RETURN:      Status
626  *
627  * DESCRIPTION: Install new GPE block with mutex support
628  *
629  ******************************************************************************/
630
631 static acpi_status
632 acpi_ev_install_gpe_block(struct acpi_gpe_block_info *gpe_block,
633                           u32 interrupt_number)
634 {
635         struct acpi_gpe_block_info *next_gpe_block;
636         struct acpi_gpe_xrupt_info *gpe_xrupt_block;
637         acpi_status status;
638         acpi_cpu_flags flags;
639
640         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
641
642         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
643         if (ACPI_FAILURE(status)) {
644                 return_ACPI_STATUS(status);
645         }
646
647         gpe_xrupt_block = acpi_ev_get_gpe_xrupt_block(interrupt_number);
648         if (!gpe_xrupt_block) {
649                 status = AE_NO_MEMORY;
650                 goto unlock_and_exit;
651         }
652
653         /* Install the new block at the end of the list with lock */
654
655         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
656         if (gpe_xrupt_block->gpe_block_list_head) {
657                 next_gpe_block = gpe_xrupt_block->gpe_block_list_head;
658                 while (next_gpe_block->next) {
659                         next_gpe_block = next_gpe_block->next;
660                 }
661
662                 next_gpe_block->next = gpe_block;
663                 gpe_block->previous = next_gpe_block;
664         } else {
665                 gpe_xrupt_block->gpe_block_list_head = gpe_block;
666         }
667
668         gpe_block->xrupt_block = gpe_xrupt_block;
669         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
670
671       unlock_and_exit:
672         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
673         return_ACPI_STATUS(status);
674 }
675
676 /*******************************************************************************
677  *
678  * FUNCTION:    acpi_ev_delete_gpe_block
679  *
680  * PARAMETERS:  gpe_block           - Existing GPE block
681  *
682  * RETURN:      Status
683  *
684  * DESCRIPTION: Remove a GPE block
685  *
686  ******************************************************************************/
687
688 acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
689 {
690         acpi_status status;
691         acpi_cpu_flags flags;
692
693         ACPI_FUNCTION_TRACE(ev_install_gpe_block);
694
695         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
696         if (ACPI_FAILURE(status)) {
697                 return_ACPI_STATUS(status);
698         }
699
700         /* Disable all GPEs in this block */
701
702         status =
703             acpi_hw_disable_gpe_block(gpe_block->xrupt_block, gpe_block, NULL);
704
705         if (!gpe_block->previous && !gpe_block->next) {
706
707                 /* This is the last gpe_block on this interrupt */
708
709                 status = acpi_ev_delete_gpe_xrupt(gpe_block->xrupt_block);
710                 if (ACPI_FAILURE(status)) {
711                         goto unlock_and_exit;
712                 }
713         } else {
714                 /* Remove the block on this interrupt with lock */
715
716                 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
717                 if (gpe_block->previous) {
718                         gpe_block->previous->next = gpe_block->next;
719                 } else {
720                         gpe_block->xrupt_block->gpe_block_list_head =
721                             gpe_block->next;
722                 }
723
724                 if (gpe_block->next) {
725                         gpe_block->next->previous = gpe_block->previous;
726                 }
727                 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
728         }
729
730         acpi_current_gpe_count -=
731             gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH;
732
733         /* Free the gpe_block */
734
735         ACPI_FREE(gpe_block->register_info);
736         ACPI_FREE(gpe_block->event_info);
737         ACPI_FREE(gpe_block);
738
739       unlock_and_exit:
740         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
741         return_ACPI_STATUS(status);
742 }
743
744 /*******************************************************************************
745  *
746  * FUNCTION:    acpi_ev_create_gpe_info_blocks
747  *
748  * PARAMETERS:  gpe_block   - New GPE block
749  *
750  * RETURN:      Status
751  *
752  * DESCRIPTION: Create the register_info and event_info blocks for this GPE block
753  *
754  ******************************************************************************/
755
756 static acpi_status
757 acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
758 {
759         struct acpi_gpe_register_info *gpe_register_info = NULL;
760         struct acpi_gpe_event_info *gpe_event_info = NULL;
761         struct acpi_gpe_event_info *this_event;
762         struct acpi_gpe_register_info *this_register;
763         u32 i;
764         u32 j;
765         acpi_status status;
766
767         ACPI_FUNCTION_TRACE(ev_create_gpe_info_blocks);
768
769         /* Allocate the GPE register information block */
770
771         gpe_register_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->
772                                                  register_count *
773                                                  sizeof(struct
774                                                         acpi_gpe_register_info));
775         if (!gpe_register_info) {
776                 ACPI_ERROR((AE_INFO,
777                             "Could not allocate the GpeRegisterInfo table"));
778                 return_ACPI_STATUS(AE_NO_MEMORY);
779         }
780
781         /*
782          * Allocate the GPE event_info block. There are eight distinct GPEs
783          * per register. Initialization to zeros is sufficient.
784          */
785         gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
786                                                register_count *
787                                                ACPI_GPE_REGISTER_WIDTH) *
788                                               sizeof(struct
789                                                      acpi_gpe_event_info));
790         if (!gpe_event_info) {
791                 ACPI_ERROR((AE_INFO,
792                             "Could not allocate the GpeEventInfo table"));
793                 status = AE_NO_MEMORY;
794                 goto error_exit;
795         }
796
797         /* Save the new Info arrays in the GPE block */
798
799         gpe_block->register_info = gpe_register_info;
800         gpe_block->event_info = gpe_event_info;
801
802         /*
803          * Initialize the GPE Register and Event structures. A goal of these
804          * tables is to hide the fact that there are two separate GPE register
805          * sets in a given GPE hardware block, the status registers occupy the
806          * first half, and the enable registers occupy the second half.
807          */
808         this_register = gpe_register_info;
809         this_event = gpe_event_info;
810
811         for (i = 0; i < gpe_block->register_count; i++) {
812
813                 /* Init the register_info for this GPE register (8 GPEs) */
814
815                 this_register->base_gpe_number =
816                     (u8) (gpe_block->block_base_number +
817                           (i * ACPI_GPE_REGISTER_WIDTH));
818
819                 this_register->status_address.address =
820                     gpe_block->block_address.address + i;
821
822                 this_register->enable_address.address =
823                     gpe_block->block_address.address + i +
824                     gpe_block->register_count;
825
826                 this_register->status_address.space_id =
827                     gpe_block->block_address.space_id;
828                 this_register->enable_address.space_id =
829                     gpe_block->block_address.space_id;
830                 this_register->status_address.bit_width =
831                     ACPI_GPE_REGISTER_WIDTH;
832                 this_register->enable_address.bit_width =
833                     ACPI_GPE_REGISTER_WIDTH;
834                 this_register->status_address.bit_offset = 0;
835                 this_register->enable_address.bit_offset = 0;
836
837                 /* Init the event_info for each GPE within this register */
838
839                 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
840                         this_event->gpe_number =
841                             (u8) (this_register->base_gpe_number + j);
842                         this_event->register_info = this_register;
843                         this_event++;
844                 }
845
846                 /* Disable all GPEs within this register */
847
848                 status = acpi_write(0x00, &this_register->enable_address);
849                 if (ACPI_FAILURE(status)) {
850                         goto error_exit;
851                 }
852
853                 /* Clear any pending GPE events within this register */
854
855                 status = acpi_write(0xFF, &this_register->status_address);
856                 if (ACPI_FAILURE(status)) {
857                         goto error_exit;
858                 }
859
860                 this_register++;
861         }
862
863         return_ACPI_STATUS(AE_OK);
864
865       error_exit:
866         if (gpe_register_info) {
867                 ACPI_FREE(gpe_register_info);
868         }
869         if (gpe_event_info) {
870                 ACPI_FREE(gpe_event_info);
871         }
872
873         return_ACPI_STATUS(status);
874 }
875
876 /*******************************************************************************
877  *
878  * FUNCTION:    acpi_ev_create_gpe_block
879  *
880  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
881  *              gpe_block_address   - Address and space_iD
882  *              register_count      - Number of GPE register pairs in the block
883  *              gpe_block_base_number - Starting GPE number for the block
884  *              interrupt_number    - H/W interrupt for the block
885  *              return_gpe_block    - Where the new block descriptor is returned
886  *
887  * RETURN:      Status
888  *
889  * DESCRIPTION: Create and Install a block of GPE registers. All GPEs within
890  *              the block are disabled at exit.
891  *              Note: Assumes namespace is locked.
892  *
893  ******************************************************************************/
894
895 acpi_status
896 acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
897                          struct acpi_generic_address *gpe_block_address,
898                          u32 register_count,
899                          u8 gpe_block_base_number,
900                          u32 interrupt_number,
901                          struct acpi_gpe_block_info **return_gpe_block)
902 {
903         acpi_status status;
904         struct acpi_gpe_block_info *gpe_block;
905
906         ACPI_FUNCTION_TRACE(ev_create_gpe_block);
907
908         if (!register_count) {
909                 return_ACPI_STATUS(AE_OK);
910         }
911
912         /* Allocate a new GPE block */
913
914         gpe_block = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_block_info));
915         if (!gpe_block) {
916                 return_ACPI_STATUS(AE_NO_MEMORY);
917         }
918
919         /* Initialize the new GPE block */
920
921         gpe_block->node = gpe_device;
922         gpe_block->register_count = register_count;
923         gpe_block->block_base_number = gpe_block_base_number;
924
925         ACPI_MEMCPY(&gpe_block->block_address, gpe_block_address,
926                     sizeof(struct acpi_generic_address));
927
928         /*
929          * Create the register_info and event_info sub-structures
930          * Note: disables and clears all GPEs in the block
931          */
932         status = acpi_ev_create_gpe_info_blocks(gpe_block);
933         if (ACPI_FAILURE(status)) {
934                 ACPI_FREE(gpe_block);
935                 return_ACPI_STATUS(status);
936         }
937
938         /* Install the new block in the global lists */
939
940         status = acpi_ev_install_gpe_block(gpe_block, interrupt_number);
941         if (ACPI_FAILURE(status)) {
942                 ACPI_FREE(gpe_block);
943                 return_ACPI_STATUS(status);
944         }
945
946         /* Find all GPE methods (_Lxx, _Exx) for this block */
947
948         status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
949                                         ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
950                                         acpi_ev_save_method_info, gpe_block,
951                                         NULL);
952
953         /* Return the new block */
954
955         if (return_gpe_block) {
956                 (*return_gpe_block) = gpe_block;
957         }
958
959         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
960                           "GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
961                           (u32) gpe_block->block_base_number,
962                           (u32) (gpe_block->block_base_number +
963                                  ((gpe_block->register_count *
964                                    ACPI_GPE_REGISTER_WIDTH) - 1)),
965                           gpe_device->name.ascii, gpe_block->register_count,
966                           interrupt_number));
967
968         /* Update global count of currently available GPEs */
969
970         acpi_current_gpe_count += register_count * ACPI_GPE_REGISTER_WIDTH;
971         return_ACPI_STATUS(AE_OK);
972 }
973
974 /*******************************************************************************
975  *
976  * FUNCTION:    acpi_ev_initialize_gpe_block
977  *
978  * PARAMETERS:  gpe_device          - Handle to the parent GPE block
979  *              gpe_block           - Gpe Block info
980  *
981  * RETURN:      Status
982  *
983  * DESCRIPTION: Initialize and enable a GPE block. First find and run any
984  *              _PRT methods associated with the block, then enable the
985  *              appropriate GPEs.
986  *              Note: Assumes namespace is locked.
987  *
988  ******************************************************************************/
989
990 acpi_status
991 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
992                              struct acpi_gpe_block_info *gpe_block)
993 {
994         acpi_status status;
995         struct acpi_gpe_event_info *gpe_event_info;
996         struct acpi_gpe_walk_info gpe_info;
997         u32 wake_gpe_count;
998         u32 gpe_enabled_count;
999         u32 i;
1000         u32 j;
1001
1002         ACPI_FUNCTION_TRACE(ev_initialize_gpe_block);
1003
1004         /* Ignore a null GPE block (e.g., if no GPE block 1 exists) */
1005
1006         if (!gpe_block) {
1007                 return_ACPI_STATUS(AE_OK);
1008         }
1009
1010         /*
1011          * Runtime option: Should wake GPEs be enabled at runtime?  The default
1012          * is no, they should only be enabled just as the machine goes to sleep.
1013          */
1014         if (acpi_gbl_leave_wake_gpes_disabled) {
1015                 /*
1016                  * Differentiate runtime vs wake GPEs, via the _PRW control methods.
1017                  * Each GPE that has one or more _PRWs that reference it is by
1018                  * definition a wake GPE and will not be enabled while the machine
1019                  * is running.
1020                  */
1021                 gpe_info.gpe_block = gpe_block;
1022                 gpe_info.gpe_device = gpe_device;
1023
1024                 status =
1025                     acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1026                                            ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1027                                            acpi_ev_match_prw_and_gpe, &gpe_info,
1028                                            NULL);
1029         }
1030
1031         /*
1032          * Enable all GPEs in this block that have these attributes:
1033          * 1) are "runtime" or "run/wake" GPEs, and
1034          * 2) have a corresponding _Lxx or _Exx method
1035          *
1036          * Any other GPEs within this block must be enabled via the acpi_enable_gpe()
1037          * external interface.
1038          */
1039         wake_gpe_count = 0;
1040         gpe_enabled_count = 0;
1041
1042         for (i = 0; i < gpe_block->register_count; i++) {
1043                 for (j = 0; j < 8; j++) {
1044
1045                         /* Get the info block for this particular GPE */
1046
1047                         gpe_event_info =
1048                             &gpe_block->
1049                             event_info[((acpi_size) i *
1050                                         ACPI_GPE_REGISTER_WIDTH) + j];
1051
1052                         if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
1053                              ACPI_GPE_DISPATCH_METHOD)
1054                             && (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
1055                                 gpe_enabled_count++;
1056                         }
1057
1058                         if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
1059                                 wake_gpe_count++;
1060                         }
1061                 }
1062         }
1063
1064         ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1065                           "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
1066                           wake_gpe_count, gpe_enabled_count));
1067
1068         /* Enable all valid runtime GPEs found above */
1069
1070         status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block, NULL);
1071         if (ACPI_FAILURE(status)) {
1072                 ACPI_ERROR((AE_INFO, "Could not enable GPEs in GpeBlock %p",
1073                             gpe_block));
1074         }
1075
1076         return_ACPI_STATUS(status);
1077 }
1078
1079 /*******************************************************************************
1080  *
1081  * FUNCTION:    acpi_ev_gpe_initialize
1082  *
1083  * PARAMETERS:  None
1084  *
1085  * RETURN:      Status
1086  *
1087  * DESCRIPTION: Initialize the GPE data structures
1088  *
1089  ******************************************************************************/
1090
1091 acpi_status acpi_ev_gpe_initialize(void)
1092 {
1093         u32 register_count0 = 0;
1094         u32 register_count1 = 0;
1095         u32 gpe_number_max = 0;
1096         acpi_status status;
1097
1098         ACPI_FUNCTION_TRACE(ev_gpe_initialize);
1099
1100         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
1101         if (ACPI_FAILURE(status)) {
1102                 return_ACPI_STATUS(status);
1103         }
1104
1105         /*
1106          * Initialize the GPE Block(s) defined in the FADT
1107          *
1108          * Why the GPE register block lengths are divided by 2:  From the ACPI Spec,
1109          * section "General-Purpose Event Registers", we have:
1110          *
1111          * "Each register block contains two registers of equal length
1112          *  GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
1113          *  GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
1114          *  The length of the GPE1_STS and GPE1_EN registers is equal to
1115          *  half the GPE1_LEN. If a generic register block is not supported
1116          *  then its respective block pointer and block length values in the
1117          *  FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
1118          *  to be the same size."
1119          */
1120
1121         /*
1122          * Determine the maximum GPE number for this machine.
1123          *
1124          * Note: both GPE0 and GPE1 are optional, and either can exist without
1125          * the other.
1126          *
1127          * If EITHER the register length OR the block address are zero, then that
1128          * particular block is not supported.
1129          */
1130         if (acpi_gbl_FADT.gpe0_block_length &&
1131             acpi_gbl_FADT.xgpe0_block.address) {
1132
1133                 /* GPE block 0 exists (has both length and address > 0) */
1134
1135                 register_count0 = (u16) (acpi_gbl_FADT.gpe0_block_length / 2);
1136
1137                 gpe_number_max =
1138                     (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
1139
1140                 /* Install GPE Block 0 */
1141
1142                 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1143                                                   &acpi_gbl_FADT.xgpe0_block,
1144                                                   register_count0, 0,
1145                                                   acpi_gbl_FADT.sci_interrupt,
1146                                                   &acpi_gbl_gpe_fadt_blocks[0]);
1147
1148                 if (ACPI_FAILURE(status)) {
1149                         ACPI_EXCEPTION((AE_INFO, status,
1150                                         "Could not create GPE Block 0"));
1151                 }
1152         }
1153
1154         if (acpi_gbl_FADT.gpe1_block_length &&
1155             acpi_gbl_FADT.xgpe1_block.address) {
1156
1157                 /* GPE block 1 exists (has both length and address > 0) */
1158
1159                 register_count1 = (u16) (acpi_gbl_FADT.gpe1_block_length / 2);
1160
1161                 /* Check for GPE0/GPE1 overlap (if both banks exist) */
1162
1163                 if ((register_count0) &&
1164                     (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
1165                         ACPI_ERROR((AE_INFO,
1166                                     "GPE0 block (GPE 0 to %d) overlaps the GPE1 block (GPE %d to %d) - Ignoring GPE1",
1167                                     gpe_number_max, acpi_gbl_FADT.gpe1_base,
1168                                     acpi_gbl_FADT.gpe1_base +
1169                                     ((register_count1 *
1170                                       ACPI_GPE_REGISTER_WIDTH) - 1)));
1171
1172                         /* Ignore GPE1 block by setting the register count to zero */
1173
1174                         register_count1 = 0;
1175                 } else {
1176                         /* Install GPE Block 1 */
1177
1178                         status =
1179                             acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
1180                                                      &acpi_gbl_FADT.xgpe1_block,
1181                                                      register_count1,
1182                                                      acpi_gbl_FADT.gpe1_base,
1183                                                      acpi_gbl_FADT.
1184                                                      sci_interrupt,
1185                                                      &acpi_gbl_gpe_fadt_blocks
1186                                                      [1]);
1187
1188                         if (ACPI_FAILURE(status)) {
1189                                 ACPI_EXCEPTION((AE_INFO, status,
1190                                                 "Could not create GPE Block 1"));
1191                         }
1192
1193                         /*
1194                          * GPE0 and GPE1 do not have to be contiguous in the GPE number
1195                          * space. However, GPE0 always starts at GPE number zero.
1196                          */
1197                         gpe_number_max = acpi_gbl_FADT.gpe1_base +
1198                             ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
1199                 }
1200         }
1201
1202         /* Exit if there are no GPE registers */
1203
1204         if ((register_count0 + register_count1) == 0) {
1205
1206                 /* GPEs are not required by ACPI, this is OK */
1207
1208                 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
1209                                   "There are no GPE blocks defined in the FADT\n"));
1210                 status = AE_OK;
1211                 goto cleanup;
1212         }
1213
1214         /* Check for Max GPE number out-of-range */
1215
1216         if (gpe_number_max > ACPI_GPE_MAX) {
1217                 ACPI_ERROR((AE_INFO,
1218                             "Maximum GPE number from FADT is too large: 0x%X",
1219                             gpe_number_max));
1220                 status = AE_BAD_VALUE;
1221                 goto cleanup;
1222         }
1223
1224       cleanup:
1225         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
1226         return_ACPI_STATUS(AE_OK);
1227 }