1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: evgpe - General Purpose Event handling and dispatch
5 *
6 * Copyright (C) 2000 - 2022, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acevents.h"
13 #include "acnamesp.h"
14
15 #define _COMPONENT ACPI_EVENTS
16 ACPI_MODULE_NAME("evgpe")
17 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
18 /* Local prototypes */
19 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
20
21 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context);
22
23 /*******************************************************************************
24 *
25 * FUNCTION: acpi_ev_update_gpe_enable_mask
26 *
27 * PARAMETERS: gpe_event_info - GPE to update
28 *
29 * RETURN: Status
30 *
31 * DESCRIPTION: Updates GPE register enable mask based upon whether there are
32 * runtime references to this GPE
33 *
34 ******************************************************************************/
35
36 acpi_status
acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info * gpe_event_info)37 acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info)
38 {
39 struct acpi_gpe_register_info *gpe_register_info;
40 u32 register_bit;
41
42 ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask);
43
44 gpe_register_info = gpe_event_info->register_info;
45 if (!gpe_register_info) {
46 return_ACPI_STATUS(AE_NOT_EXIST);
47 }
48
49 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
50
51 /* Clear the run bit up front */
52
53 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
54
55 /* Set the mask bit only if there are references to this GPE */
56
57 if (gpe_event_info->runtime_count) {
58 ACPI_SET_BIT(gpe_register_info->enable_for_run,
59 (u8)register_bit);
60 }
61
62 gpe_register_info->enable_mask = gpe_register_info->enable_for_run;
63 return_ACPI_STATUS(AE_OK);
64 }
65
66 /*******************************************************************************
67 *
68 * FUNCTION: acpi_ev_enable_gpe
69 *
70 * PARAMETERS: gpe_event_info - GPE to enable
71 *
72 * RETURN: Status
73 *
74 * DESCRIPTION: Enable a GPE.
75 *
76 ******************************************************************************/
77
acpi_ev_enable_gpe(struct acpi_gpe_event_info * gpe_event_info)78 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
79 {
80 acpi_status status;
81
82 ACPI_FUNCTION_TRACE(ev_enable_gpe);
83
84 /* Enable the requested GPE */
85
86 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
87 return_ACPI_STATUS(status);
88 }
89
90 /*******************************************************************************
91 *
92 * FUNCTION: acpi_ev_mask_gpe
93 *
94 * PARAMETERS: gpe_event_info - GPE to be blocked/unblocked
95 * is_masked - Whether the GPE is masked or not
96 *
97 * RETURN: Status
98 *
99 * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime.
100 *
101 ******************************************************************************/
102
103 acpi_status
acpi_ev_mask_gpe(struct acpi_gpe_event_info * gpe_event_info,u8 is_masked)104 acpi_ev_mask_gpe(struct acpi_gpe_event_info *gpe_event_info, u8 is_masked)
105 {
106 struct acpi_gpe_register_info *gpe_register_info;
107 u32 register_bit;
108
109 ACPI_FUNCTION_TRACE(ev_mask_gpe);
110
111 gpe_register_info = gpe_event_info->register_info;
112 if (!gpe_register_info) {
113 return_ACPI_STATUS(AE_NOT_EXIST);
114 }
115
116 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
117
118 /* Perform the action */
119
120 if (is_masked) {
121 if (register_bit & gpe_register_info->mask_for_run) {
122 return_ACPI_STATUS(AE_BAD_PARAMETER);
123 }
124
125 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
126 ACPI_SET_BIT(gpe_register_info->mask_for_run, (u8)register_bit);
127 } else {
128 if (!(register_bit & gpe_register_info->mask_for_run)) {
129 return_ACPI_STATUS(AE_BAD_PARAMETER);
130 }
131
132 ACPI_CLEAR_BIT(gpe_register_info->mask_for_run,
133 (u8)register_bit);
134 if (gpe_event_info->runtime_count
135 && !gpe_event_info->disable_for_dispatch) {
136 (void)acpi_hw_low_set_gpe(gpe_event_info,
137 ACPI_GPE_ENABLE);
138 }
139 }
140
141 return_ACPI_STATUS(AE_OK);
142 }
143
144 /*******************************************************************************
145 *
146 * FUNCTION: acpi_ev_add_gpe_reference
147 *
148 * PARAMETERS: gpe_event_info - Add a reference to this GPE
149 * clear_on_enable - Clear GPE status before enabling it
150 *
151 * RETURN: Status
152 *
153 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
154 * hardware-enabled.
155 *
156 ******************************************************************************/
157
158 acpi_status
acpi_ev_add_gpe_reference(struct acpi_gpe_event_info * gpe_event_info,u8 clear_on_enable)159 acpi_ev_add_gpe_reference(struct acpi_gpe_event_info *gpe_event_info,
160 u8 clear_on_enable)
161 {
162 acpi_status status = AE_OK;
163
164 ACPI_FUNCTION_TRACE(ev_add_gpe_reference);
165
166 if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
167 return_ACPI_STATUS(AE_LIMIT);
168 }
169
170 gpe_event_info->runtime_count++;
171 if (gpe_event_info->runtime_count == 1) {
172
173 /* Enable on first reference */
174
175 if (clear_on_enable) {
176 (void)acpi_hw_clear_gpe(gpe_event_info);
177 }
178
179 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
180 if (ACPI_SUCCESS(status)) {
181 status = acpi_ev_enable_gpe(gpe_event_info);
182 }
183
184 if (ACPI_FAILURE(status)) {
185 gpe_event_info->runtime_count--;
186 }
187 }
188
189 return_ACPI_STATUS(status);
190 }
191
192 /*******************************************************************************
193 *
194 * FUNCTION: acpi_ev_remove_gpe_reference
195 *
196 * PARAMETERS: gpe_event_info - Remove a reference to this GPE
197 *
198 * RETURN: Status
199 *
200 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
201 * removed, the GPE is hardware-disabled.
202 *
203 ******************************************************************************/
204
205 acpi_status
acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info * gpe_event_info)206 acpi_ev_remove_gpe_reference(struct acpi_gpe_event_info *gpe_event_info)
207 {
208 acpi_status status = AE_OK;
209
210 ACPI_FUNCTION_TRACE(ev_remove_gpe_reference);
211
212 if (!gpe_event_info->runtime_count) {
213 return_ACPI_STATUS(AE_LIMIT);
214 }
215
216 gpe_event_info->runtime_count--;
217 if (!gpe_event_info->runtime_count) {
218
219 /* Disable on last reference */
220
221 status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
222 if (ACPI_SUCCESS(status)) {
223 status =
224 acpi_hw_low_set_gpe(gpe_event_info,
225 ACPI_GPE_DISABLE);
226 }
227
228 if (ACPI_FAILURE(status)) {
229 gpe_event_info->runtime_count++;
230 }
231 }
232
233 return_ACPI_STATUS(status);
234 }
235
236 /*******************************************************************************
237 *
238 * FUNCTION: acpi_ev_low_get_gpe_info
239 *
240 * PARAMETERS: gpe_number - Raw GPE number
241 * gpe_block - A GPE info block
242 *
243 * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number
244 * is not within the specified GPE block)
245 *
246 * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
247 * the low-level implementation of ev_get_gpe_event_info.
248 *
249 ******************************************************************************/
250
acpi_ev_low_get_gpe_info(u32 gpe_number,struct acpi_gpe_block_info * gpe_block)251 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
252 struct acpi_gpe_block_info
253 *gpe_block)
254 {
255 u32 gpe_index;
256
257 /*
258 * Validate that the gpe_number is within the specified gpe_block.
259 * (Two steps)
260 */
261 if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
262 return (NULL);
263 }
264
265 gpe_index = gpe_number - gpe_block->block_base_number;
266 if (gpe_index >= gpe_block->gpe_count) {
267 return (NULL);
268 }
269
270 return (&gpe_block->event_info[gpe_index]);
271 }
272
273
274 /*******************************************************************************
275 *
276 * FUNCTION: acpi_ev_get_gpe_event_info
277 *
278 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
279 * gpe_number - Raw GPE number
280 *
281 * RETURN: A GPE event_info struct. NULL if not a valid GPE
282 *
283 * DESCRIPTION: Returns the event_info struct associated with this GPE.
284 * Validates the gpe_block and the gpe_number
285 *
286 * Should be called only when the GPE lists are semaphore locked
287 * and not subject to change.
288 *
289 ******************************************************************************/
290
acpi_ev_get_gpe_event_info(acpi_handle gpe_device,u32 gpe_number)291 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
292 u32 gpe_number)
293 {
294 union acpi_operand_object *obj_desc;
295 struct acpi_gpe_event_info *gpe_info;
296 u32 i;
297
298 ACPI_FUNCTION_ENTRY();
299
300 /* A NULL gpe_device means use the FADT-defined GPE block(s) */
301
302 if (!gpe_device) {
303
304 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
305
306 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
307 gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
308 acpi_gbl_gpe_fadt_blocks
309 [i]);
310 if (gpe_info) {
311 return (gpe_info);
312 }
313 }
314
315 /* The gpe_number was not in the range of either FADT GPE block */
316
317 return (NULL);
318 }
319
320 /* A Non-NULL gpe_device means this is a GPE Block Device */
321
322 obj_desc =
323 acpi_ns_get_attached_object((struct acpi_namespace_node *)
324 gpe_device);
325 if (!obj_desc || !obj_desc->device.gpe_block) {
326 return (NULL);
327 }
328
329 return (acpi_ev_low_get_gpe_info
330 (gpe_number, obj_desc->device.gpe_block));
331 }
332
333 /*******************************************************************************
334 *
335 * FUNCTION: acpi_ev_gpe_detect
336 *
337 * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt.
338 * Can have multiple GPE blocks attached.
339 *
340 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
341 *
342 * DESCRIPTION: Detect if any GP events have occurred. This function is
343 * executed at interrupt level.
344 *
345 ******************************************************************************/
346
acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)347 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list)
348 {
349 struct acpi_gpe_block_info *gpe_block;
350 struct acpi_namespace_node *gpe_device;
351 struct acpi_gpe_register_info *gpe_register_info;
352 struct acpi_gpe_event_info *gpe_event_info;
353 u32 gpe_number;
354 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
355 acpi_cpu_flags flags;
356 u32 i;
357 u32 j;
358
359 ACPI_FUNCTION_NAME(ev_gpe_detect);
360
361 /* Check for the case where there are no GPEs */
362
363 if (!gpe_xrupt_list) {
364 return (int_status);
365 }
366
367 /*
368 * We need to obtain the GPE lock for both the data structs and registers
369 * Note: Not necessary to obtain the hardware lock, since the GPE
370 * registers are owned by the gpe_lock.
371 */
372 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
373
374 /* Examine all GPE blocks attached to this interrupt level */
375
376 gpe_block = gpe_xrupt_list->gpe_block_list_head;
377 while (gpe_block) {
378 gpe_device = gpe_block->node;
379
380 /*
381 * Read all of the 8-bit GPE status and enable registers in this GPE
382 * block, saving all of them. Find all currently active GP events.
383 */
384 for (i = 0; i < gpe_block->register_count; i++) {
385
386 /* Get the next status/enable pair */
387
388 gpe_register_info = &gpe_block->register_info[i];
389
390 /*
391 * Optimization: If there are no GPEs enabled within this
392 * register, we can safely ignore the entire register.
393 */
394 if (!(gpe_register_info->enable_for_run |
395 gpe_register_info->enable_for_wake)) {
396 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
397 "Ignore disabled registers for GPE %02X-%02X: "
398 "RunEnable=%02X, WakeEnable=%02X\n",
399 gpe_register_info->
400 base_gpe_number,
401 gpe_register_info->
402 base_gpe_number +
403 (ACPI_GPE_REGISTER_WIDTH - 1),
404 gpe_register_info->
405 enable_for_run,
406 gpe_register_info->
407 enable_for_wake));
408 continue;
409 }
410
411 /* Now look at the individual GPEs in this byte register */
412
413 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
414
415 /* Detect and dispatch one GPE bit */
416
417 gpe_event_info =
418 &gpe_block->
419 event_info[((acpi_size)i *
420 ACPI_GPE_REGISTER_WIDTH) + j];
421 gpe_number =
422 j + gpe_register_info->base_gpe_number;
423 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
424 int_status |=
425 acpi_ev_detect_gpe(gpe_device,
426 gpe_event_info,
427 gpe_number);
428 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
429 }
430 }
431
432 gpe_block = gpe_block->next;
433 }
434
435 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
436 return (int_status);
437 }
438
439 /*******************************************************************************
440 *
441 * FUNCTION: acpi_ev_asynch_execute_gpe_method
442 *
443 * PARAMETERS: Context (gpe_event_info) - Info for this GPE
444 *
445 * RETURN: None
446 *
447 * DESCRIPTION: Perform the actual execution of a GPE control method. This
448 * function is called from an invocation of acpi_os_execute and
449 * therefore does NOT execute at interrupt level - so that
450 * the control method itself is not executed in the context of
451 * an interrupt handler.
452 *
453 ******************************************************************************/
454
acpi_ev_asynch_execute_gpe_method(void * context)455 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
456 {
457 struct acpi_gpe_event_info *gpe_event_info = context;
458 acpi_status status = AE_OK;
459 struct acpi_evaluate_info *info;
460 struct acpi_gpe_notify_info *notify;
461
462 ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
463
464 /* Do the correct dispatch - normal method or implicit notify */
465
466 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
467 case ACPI_GPE_DISPATCH_NOTIFY:
468 /*
469 * Implicit notify.
470 * Dispatch a DEVICE_WAKE notify to the appropriate handler.
471 * NOTE: the request is queued for execution after this method
472 * completes. The notify handlers are NOT invoked synchronously
473 * from this thread -- because handlers may in turn run other
474 * control methods.
475 *
476 * June 2012: Expand implicit notify mechanism to support
477 * notifies on multiple device objects.
478 */
479 notify = gpe_event_info->dispatch.notify_list;
480 while (ACPI_SUCCESS(status) && notify) {
481 status =
482 acpi_ev_queue_notify_request(notify->device_node,
483 ACPI_NOTIFY_DEVICE_WAKE);
484
485 notify = notify->next;
486 }
487
488 break;
489
490 case ACPI_GPE_DISPATCH_METHOD:
491
492 /* Allocate the evaluation information block */
493
494 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
495 if (!info) {
496 status = AE_NO_MEMORY;
497 } else {
498 /*
499 * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the
500 * _Lxx/_Exx control method that corresponds to this GPE
501 */
502 info->prefix_node =
503 gpe_event_info->dispatch.method_node;
504 info->flags = ACPI_IGNORE_RETURN_VALUE;
505
506 status = acpi_ns_evaluate(info);
507 ACPI_FREE(info);
508 }
509
510 if (ACPI_FAILURE(status)) {
511 ACPI_EXCEPTION((AE_INFO, status,
512 "while evaluating GPE method [%4.4s]",
513 acpi_ut_get_node_name(gpe_event_info->
514 dispatch.
515 method_node)));
516 }
517 break;
518
519 default:
520
521 goto error_exit; /* Should never happen */
522 }
523
524 /* Defer enabling of GPE until all notify handlers are done */
525
526 status = acpi_os_execute(OSL_NOTIFY_HANDLER,
527 acpi_ev_asynch_enable_gpe, gpe_event_info);
528 if (ACPI_SUCCESS(status)) {
529 return_VOID;
530 }
531
532 error_exit:
533 acpi_ev_asynch_enable_gpe(gpe_event_info);
534 return_VOID;
535 }
536
537
538 /*******************************************************************************
539 *
540 * FUNCTION: acpi_ev_asynch_enable_gpe
541 *
542 * PARAMETERS: Context (gpe_event_info) - Info for this GPE
543 * Callback from acpi_os_execute
544 *
545 * RETURN: None
546 *
547 * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to
548 * complete (i.e., finish execution of Notify)
549 *
550 ******************************************************************************/
551
acpi_ev_asynch_enable_gpe(void * context)552 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_enable_gpe(void *context)
553 {
554 struct acpi_gpe_event_info *gpe_event_info = context;
555 acpi_cpu_flags flags;
556
557 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
558 (void)acpi_ev_finish_gpe(gpe_event_info);
559 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
560
561 return;
562 }
563
564
565 /*******************************************************************************
566 *
567 * FUNCTION: acpi_ev_finish_gpe
568 *
569 * PARAMETERS: gpe_event_info - Info for this GPE
570 *
571 * RETURN: Status
572 *
573 * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution
574 * of a GPE method or a synchronous or asynchronous GPE handler.
575 *
576 ******************************************************************************/
577
acpi_ev_finish_gpe(struct acpi_gpe_event_info * gpe_event_info)578 acpi_status acpi_ev_finish_gpe(struct acpi_gpe_event_info *gpe_event_info)
579 {
580 acpi_status status;
581
582 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
583 ACPI_GPE_LEVEL_TRIGGERED) {
584 /*
585 * GPE is level-triggered, we clear the GPE status bit after
586 * handling the event.
587 */
588 status = acpi_hw_clear_gpe(gpe_event_info);
589 if (ACPI_FAILURE(status)) {
590 return (status);
591 }
592 }
593
594 /*
595 * Enable this GPE, conditionally. This means that the GPE will
596 * only be physically enabled if the enable_mask bit is set
597 * in the event_info.
598 */
599 (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_CONDITIONAL_ENABLE);
600 gpe_event_info->disable_for_dispatch = FALSE;
601 return (AE_OK);
602 }
603
604
605 /*******************************************************************************
606 *
607 * FUNCTION: acpi_ev_detect_gpe
608 *
609 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
610 * gpe_event_info - Info for this GPE
611 * gpe_number - Number relative to the parent GPE block
612 *
613 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
614 *
615 * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function
616 * (e.g. EC) or method (e.g. _Lxx/_Exx) handler.
617 * NOTE: GPE is W1C, so it is possible to handle a single GPE from both
618 * task and irq context in parallel as long as the process to
619 * detect and mask the GPE is atomic.
620 * However the atomicity of ACPI_GPE_DISPATCH_RAW_HANDLER is
621 * dependent on the raw handler itself.
622 *
623 ******************************************************************************/
624
625 u32
acpi_ev_detect_gpe(struct acpi_namespace_node * gpe_device,struct acpi_gpe_event_info * gpe_event_info,u32 gpe_number)626 acpi_ev_detect_gpe(struct acpi_namespace_node *gpe_device,
627 struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
628 {
629 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
630 u8 enabled_status_byte;
631 u64 status_reg;
632 u64 enable_reg;
633 u32 register_bit;
634 struct acpi_gpe_register_info *gpe_register_info;
635 struct acpi_gpe_handler_info *gpe_handler_info;
636 acpi_cpu_flags flags;
637 acpi_status status;
638
639 ACPI_FUNCTION_TRACE(ev_gpe_detect);
640
641 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
642
643 if (!gpe_event_info) {
644 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
645 if (!gpe_event_info)
646 goto error_exit;
647 }
648
649 /* Get the info block for the entire GPE register */
650
651 gpe_register_info = gpe_event_info->register_info;
652
653 /* Get the register bitmask for this GPE */
654
655 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
656
657 /* GPE currently enabled (enable bit == 1)? */
658
659 status = acpi_hw_gpe_read(&enable_reg, &gpe_register_info->enable_address);
660 if (ACPI_FAILURE(status)) {
661 goto error_exit;
662 }
663
664 /* GPE currently active (status bit == 1)? */
665
666 status = acpi_hw_gpe_read(&status_reg, &gpe_register_info->status_address);
667 if (ACPI_FAILURE(status)) {
668 goto error_exit;
669 }
670
671 /* Check if there is anything active at all in this GPE */
672
673 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
674 "Read registers for GPE %02X: Status=%02X, Enable=%02X, "
675 "RunEnable=%02X, WakeEnable=%02X\n",
676 gpe_number,
677 (u32)(status_reg & register_bit),
678 (u32)(enable_reg & register_bit),
679 gpe_register_info->enable_for_run,
680 gpe_register_info->enable_for_wake));
681
682 enabled_status_byte = (u8)(status_reg & enable_reg);
683 if (!(enabled_status_byte & register_bit)) {
684 goto error_exit;
685 }
686
687 /* Invoke global event handler if present */
688
689 acpi_gpe_count++;
690 if (acpi_gbl_global_event_handler) {
691 acpi_gbl_global_event_handler(ACPI_EVENT_TYPE_GPE,
692 gpe_device, gpe_number,
693 acpi_gbl_global_event_handler_context);
694 }
695
696 /* Found an active GPE */
697
698 if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
699 ACPI_GPE_DISPATCH_RAW_HANDLER) {
700
701 /* Dispatch the event to a raw handler */
702
703 gpe_handler_info = gpe_event_info->dispatch.handler;
704
705 /*
706 * There is no protection around the namespace node
707 * and the GPE handler to ensure a safe destruction
708 * because:
709 * 1. The namespace node is expected to always
710 * exist after loading a table.
711 * 2. The GPE handler is expected to be flushed by
712 * acpi_os_wait_events_complete() before the
713 * destruction.
714 */
715 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
716 int_status |=
717 gpe_handler_info->address(gpe_device, gpe_number,
718 gpe_handler_info->context);
719 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
720 } else {
721 /* Dispatch the event to a standard handler or method. */
722
723 int_status |= acpi_ev_gpe_dispatch(gpe_device,
724 gpe_event_info, gpe_number);
725 }
726
727 error_exit:
728 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
729 return (int_status);
730 }
731
732 /*******************************************************************************
733 *
734 * FUNCTION: acpi_ev_gpe_dispatch
735 *
736 * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1
737 * gpe_event_info - Info for this GPE
738 * gpe_number - Number relative to the parent GPE block
739 *
740 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
741 *
742 * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
743 * or method (e.g. _Lxx/_Exx) handler.
744 *
745 ******************************************************************************/
746
747 u32
acpi_ev_gpe_dispatch(struct acpi_namespace_node * gpe_device,struct acpi_gpe_event_info * gpe_event_info,u32 gpe_number)748 acpi_ev_gpe_dispatch(struct acpi_namespace_node *gpe_device,
749 struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
750 {
751 acpi_status status;
752 u32 return_value;
753
754 ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
755
756 /*
757 * Always disable the GPE so that it does not keep firing before
758 * any asynchronous activity completes (either from the execution
759 * of a GPE method or an asynchronous GPE handler.)
760 *
761 * If there is no handler or method to run, just disable the
762 * GPE and leave it disabled permanently to prevent further such
763 * pointless events from firing.
764 */
765 status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
766 if (ACPI_FAILURE(status)) {
767 ACPI_EXCEPTION((AE_INFO, status,
768 "Unable to disable GPE %02X", gpe_number));
769 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
770 }
771
772 /*
773 * If edge-triggered, clear the GPE status bit now. Note that
774 * level-triggered events are cleared after the GPE is serviced.
775 */
776 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
777 ACPI_GPE_EDGE_TRIGGERED) {
778 status = acpi_hw_clear_gpe(gpe_event_info);
779 if (ACPI_FAILURE(status)) {
780 ACPI_EXCEPTION((AE_INFO, status,
781 "Unable to clear GPE %02X",
782 gpe_number));
783 (void)acpi_hw_low_set_gpe(gpe_event_info,
784 ACPI_GPE_CONDITIONAL_ENABLE);
785 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
786 }
787 }
788
789 gpe_event_info->disable_for_dispatch = TRUE;
790
791 /*
792 * Dispatch the GPE to either an installed handler or the control
793 * method associated with this GPE (_Lxx or _Exx). If a handler
794 * exists, we invoke it and do not attempt to run the method.
795 * If there is neither a handler nor a method, leave the GPE
796 * disabled.
797 */
798 switch (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)) {
799 case ACPI_GPE_DISPATCH_HANDLER:
800
801 /* Invoke the installed handler (at interrupt level) */
802
803 return_value =
804 gpe_event_info->dispatch.handler->address(gpe_device,
805 gpe_number,
806 gpe_event_info->
807 dispatch.handler->
808 context);
809
810 /* If requested, clear (if level-triggered) and re-enable the GPE */
811
812 if (return_value & ACPI_REENABLE_GPE) {
813 (void)acpi_ev_finish_gpe(gpe_event_info);
814 }
815 break;
816
817 case ACPI_GPE_DISPATCH_METHOD:
818 case ACPI_GPE_DISPATCH_NOTIFY:
819 /*
820 * Execute the method associated with the GPE
821 * NOTE: Level-triggered GPEs are cleared after the method completes.
822 */
823 status = acpi_os_execute(OSL_GPE_HANDLER,
824 acpi_ev_asynch_execute_gpe_method,
825 gpe_event_info);
826 if (ACPI_FAILURE(status)) {
827 ACPI_EXCEPTION((AE_INFO, status,
828 "Unable to queue handler for GPE %02X - event disabled",
829 gpe_number));
830 }
831 break;
832
833 default:
834 /*
835 * No handler or method to run!
836 * 03/2010: This case should no longer be possible. We will not allow
837 * a GPE to be enabled if it has no handler or method.
838 */
839 ACPI_ERROR((AE_INFO,
840 "No handler or method for GPE %02X, disabling event",
841 gpe_number));
842
843 break;
844 }
845
846 return_UINT32(ACPI_INTERRUPT_HANDLED);
847 }
848
849 #endif /* !ACPI_REDUCED_HARDWARE */
850