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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evgpe - General Purpose Event handling and dispatch | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
a8357b0c | 8 | * Copyright (C) 2000 - 2010, Intel Corp. |
1da177e4 LT |
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> | |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acevents.h" | |
47 | #include "acnamesp.h" | |
1da177e4 LT |
48 | |
49 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 50 | ACPI_MODULE_NAME("evgpe") |
1da177e4 | 51 | |
44f6c012 | 52 | /* Local prototypes */ |
4be44fcd | 53 | static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context); |
1da177e4 | 54 | |
1da177e4 LT |
55 | /******************************************************************************* |
56 | * | |
a44061aa | 57 | * FUNCTION: acpi_ev_update_gpe_enable_mask |
1da177e4 LT |
58 | * |
59 | * PARAMETERS: gpe_event_info - GPE to update | |
1da177e4 LT |
60 | * |
61 | * RETURN: Status | |
62 | * | |
a44061aa RW |
63 | * DESCRIPTION: Updates GPE register enable mask based upon whether there are |
64 | * runtime references to this GPE | |
1da177e4 LT |
65 | * |
66 | ******************************************************************************/ | |
67 | ||
68 | acpi_status | |
a44061aa | 69 | acpi_ev_update_gpe_enable_mask(struct acpi_gpe_event_info *gpe_event_info) |
1da177e4 | 70 | { |
4be44fcd | 71 | struct acpi_gpe_register_info *gpe_register_info; |
e4e9a735 | 72 | u32 register_bit; |
1da177e4 | 73 | |
a44061aa | 74 | ACPI_FUNCTION_TRACE(ev_update_gpe_enable_mask); |
1da177e4 LT |
75 | |
76 | gpe_register_info = gpe_event_info->register_info; | |
77 | if (!gpe_register_info) { | |
4be44fcd | 78 | return_ACPI_STATUS(AE_NOT_EXIST); |
1da177e4 | 79 | } |
d4913dc6 | 80 | |
b76df673 | 81 | register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info, |
e4e9a735 | 82 | gpe_register_info); |
1da177e4 | 83 | |
a44061aa | 84 | /* Clear the run bit up front */ |
0f849d2c | 85 | |
9630bdd9 | 86 | ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit); |
1da177e4 | 87 | |
a44061aa | 88 | /* Set the mask bit only if there are references to this GPE */ |
0f849d2c LM |
89 | |
90 | if (gpe_event_info->runtime_count) { | |
a44061aa | 91 | ACPI_SET_BIT(gpe_register_info->enable_for_run, (u8)register_bit); |
0f849d2c | 92 | } |
1da177e4 | 93 | |
4be44fcd | 94 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
95 | } |
96 | ||
3bd741bd RW |
97 | /******************************************************************************* |
98 | * | |
99 | * FUNCTION: acpi_ev_enable_gpe | |
100 | * | |
101 | * PARAMETERS: gpe_event_info - GPE to enable | |
102 | * | |
103 | * RETURN: Status | |
104 | * | |
105 | * DESCRIPTION: Clear the given GPE from stale events and enable it. | |
106 | * | |
107 | ******************************************************************************/ | |
108 | acpi_status | |
109 | acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) | |
110 | { | |
111 | acpi_status status; | |
112 | ||
113 | ACPI_FUNCTION_TRACE(ev_enable_gpe); | |
114 | ||
115 | /* | |
116 | * We will only allow a GPE to be enabled if it has either an | |
117 | * associated method (_Lxx/_Exx) or a handler. Otherwise, the | |
118 | * GPE will be immediately disabled by acpi_ev_gpe_dispatch the | |
119 | * first time it fires. | |
120 | */ | |
121 | if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) { | |
122 | return_ACPI_STATUS(AE_NO_HANDLER); | |
123 | } | |
124 | ||
125 | /* Clear the GPE (of stale events) */ | |
126 | status = acpi_hw_clear_gpe(gpe_event_info); | |
127 | if (ACPI_FAILURE(status)) { | |
128 | return_ACPI_STATUS(status); | |
129 | } | |
130 | ||
131 | /* Enable the requested GPE */ | |
132 | status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE); | |
133 | ||
134 | return_ACPI_STATUS(status); | |
135 | } | |
136 | ||
0f849d2c | 137 | |
28f4f8a9 RW |
138 | /******************************************************************************* |
139 | * | |
140 | * FUNCTION: acpi_raw_enable_gpe | |
141 | * | |
142 | * PARAMETERS: gpe_event_info - GPE to enable | |
143 | * | |
144 | * RETURN: Status | |
145 | * | |
146 | * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is | |
147 | * hardware-enabled. | |
148 | * | |
149 | ******************************************************************************/ | |
150 | ||
151 | acpi_status acpi_raw_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) | |
152 | { | |
153 | acpi_status status = AE_OK; | |
154 | ||
155 | if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) { | |
156 | return_ACPI_STATUS(AE_LIMIT); | |
157 | } | |
158 | ||
159 | gpe_event_info->runtime_count++; | |
160 | if (gpe_event_info->runtime_count == 1) { | |
161 | status = acpi_ev_update_gpe_enable_mask(gpe_event_info); | |
162 | if (ACPI_SUCCESS(status)) { | |
163 | status = acpi_ev_enable_gpe(gpe_event_info); | |
164 | } | |
165 | ||
166 | if (ACPI_FAILURE(status)) { | |
167 | gpe_event_info->runtime_count--; | |
168 | } | |
169 | } | |
170 | ||
171 | return_ACPI_STATUS(status); | |
172 | } | |
173 | ||
174 | /******************************************************************************* | |
175 | * | |
176 | * FUNCTION: acpi_raw_disable_gpe | |
177 | * | |
178 | * PARAMETERS: gpe_event_info - GPE to disable | |
179 | * | |
180 | * RETURN: Status | |
181 | * | |
182 | * DESCRIPTION: Remove a reference to a GPE. When the last reference is | |
183 | * removed, the GPE is hardware-disabled. | |
184 | * | |
185 | ******************************************************************************/ | |
186 | ||
187 | acpi_status acpi_raw_disable_gpe(struct acpi_gpe_event_info *gpe_event_info) | |
188 | { | |
189 | acpi_status status = AE_OK; | |
190 | ||
191 | if (!gpe_event_info->runtime_count) { | |
192 | return_ACPI_STATUS(AE_LIMIT); | |
193 | } | |
194 | ||
195 | gpe_event_info->runtime_count--; | |
196 | if (!gpe_event_info->runtime_count) { | |
197 | status = acpi_ev_update_gpe_enable_mask(gpe_event_info); | |
198 | if (ACPI_SUCCESS(status)) { | |
199 | status = acpi_hw_low_set_gpe(gpe_event_info, | |
200 | ACPI_GPE_DISABLE); | |
201 | } | |
202 | ||
203 | if (ACPI_FAILURE(status)) { | |
204 | gpe_event_info->runtime_count++; | |
205 | } | |
206 | } | |
207 | ||
208 | return_ACPI_STATUS(status); | |
209 | } | |
210 | ||
0f849d2c LM |
211 | /******************************************************************************* |
212 | * | |
213 | * FUNCTION: acpi_ev_low_get_gpe_info | |
214 | * | |
215 | * PARAMETERS: gpe_number - Raw GPE number | |
216 | * gpe_block - A GPE info block | |
217 | * | |
218 | * RETURN: A GPE event_info struct. NULL if not a valid GPE (The gpe_number | |
219 | * is not within the specified GPE block) | |
220 | * | |
221 | * DESCRIPTION: Returns the event_info struct associated with this GPE. This is | |
222 | * the low-level implementation of ev_get_gpe_event_info. | |
223 | * | |
224 | ******************************************************************************/ | |
225 | ||
226 | struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number, | |
227 | struct acpi_gpe_block_info | |
228 | *gpe_block) | |
229 | { | |
230 | u32 gpe_index; | |
231 | ||
232 | /* | |
233 | * Validate that the gpe_number is within the specified gpe_block. | |
234 | * (Two steps) | |
235 | */ | |
236 | if (!gpe_block || (gpe_number < gpe_block->block_base_number)) { | |
237 | return (NULL); | |
238 | } | |
239 | ||
240 | gpe_index = gpe_number - gpe_block->block_base_number; | |
241 | if (gpe_index >= gpe_block->gpe_count) { | |
242 | return (NULL); | |
243 | } | |
244 | ||
245 | return (&gpe_block->event_info[gpe_index]); | |
246 | } | |
247 | ||
248 | ||
1da177e4 LT |
249 | /******************************************************************************* |
250 | * | |
251 | * FUNCTION: acpi_ev_get_gpe_event_info | |
252 | * | |
9f15fc66 | 253 | * PARAMETERS: gpe_device - Device node. NULL for GPE0/GPE1 |
1da177e4 LT |
254 | * gpe_number - Raw GPE number |
255 | * | |
256 | * RETURN: A GPE event_info struct. NULL if not a valid GPE | |
257 | * | |
258 | * DESCRIPTION: Returns the event_info struct associated with this GPE. | |
259 | * Validates the gpe_block and the gpe_number | |
260 | * | |
261 | * Should be called only when the GPE lists are semaphore locked | |
262 | * and not subject to change. | |
263 | * | |
264 | ******************************************************************************/ | |
265 | ||
4be44fcd LB |
266 | struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device, |
267 | u32 gpe_number) | |
1da177e4 | 268 | { |
4be44fcd | 269 | union acpi_operand_object *obj_desc; |
0f849d2c | 270 | struct acpi_gpe_event_info *gpe_info; |
67a119f9 | 271 | u32 i; |
1da177e4 | 272 | |
4be44fcd | 273 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 274 | |
186c307f | 275 | /* A NULL gpe_device means use the FADT-defined GPE block(s) */ |
1da177e4 LT |
276 | |
277 | if (!gpe_device) { | |
52fc0b02 | 278 | |
1da177e4 LT |
279 | /* Examine GPE Block 0 and 1 (These blocks are permanent) */ |
280 | ||
281 | for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) { | |
0f849d2c LM |
282 | gpe_info = acpi_ev_low_get_gpe_info(gpe_number, |
283 | acpi_gbl_gpe_fadt_blocks | |
284 | [i]); | |
285 | if (gpe_info) { | |
286 | return (gpe_info); | |
1da177e4 LT |
287 | } |
288 | } | |
289 | ||
290 | /* The gpe_number was not in the range of either FADT GPE block */ | |
291 | ||
292 | return (NULL); | |
293 | } | |
294 | ||
295 | /* A Non-NULL gpe_device means this is a GPE Block Device */ | |
296 | ||
fd350943 LB |
297 | obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *) |
298 | gpe_device); | |
4be44fcd | 299 | if (!obj_desc || !obj_desc->device.gpe_block) { |
1da177e4 LT |
300 | return (NULL); |
301 | } | |
302 | ||
0f849d2c LM |
303 | return (acpi_ev_low_get_gpe_info |
304 | (gpe_number, obj_desc->device.gpe_block)); | |
1da177e4 LT |
305 | } |
306 | ||
1da177e4 LT |
307 | /******************************************************************************* |
308 | * | |
309 | * FUNCTION: acpi_ev_gpe_detect | |
310 | * | |
311 | * PARAMETERS: gpe_xrupt_list - Interrupt block for this interrupt. | |
312 | * Can have multiple GPE blocks attached. | |
313 | * | |
314 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED | |
315 | * | |
9f15fc66 | 316 | * DESCRIPTION: Detect if any GP events have occurred. This function is |
1da177e4 LT |
317 | * executed at interrupt level. |
318 | * | |
319 | ******************************************************************************/ | |
320 | ||
4be44fcd | 321 | u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list) |
1da177e4 | 322 | { |
0897831b BM |
323 | acpi_status status; |
324 | struct acpi_gpe_block_info *gpe_block; | |
325 | struct acpi_gpe_register_info *gpe_register_info; | |
4be44fcd LB |
326 | u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; |
327 | u8 enabled_status_byte; | |
4be44fcd LB |
328 | u32 status_reg; |
329 | u32 enable_reg; | |
b8e4d893 | 330 | acpi_cpu_flags flags; |
67a119f9 BM |
331 | u32 i; |
332 | u32 j; | |
4be44fcd | 333 | |
b229cf92 | 334 | ACPI_FUNCTION_NAME(ev_gpe_detect); |
1da177e4 LT |
335 | |
336 | /* Check for the case where there are no GPEs */ | |
337 | ||
338 | if (!gpe_xrupt_list) { | |
339 | return (int_status); | |
340 | } | |
341 | ||
967440e3 BM |
342 | /* |
343 | * We need to obtain the GPE lock for both the data structs and registers | |
9f15fc66 BM |
344 | * Note: Not necessary to obtain the hardware lock, since the GPE |
345 | * registers are owned by the gpe_lock. | |
967440e3 | 346 | */ |
4be44fcd | 347 | flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); |
4c90ece2 BM |
348 | |
349 | /* Examine all GPE blocks attached to this interrupt level */ | |
350 | ||
1da177e4 LT |
351 | gpe_block = gpe_xrupt_list->gpe_block_list_head; |
352 | while (gpe_block) { | |
353 | /* | |
9f15fc66 BM |
354 | * Read all of the 8-bit GPE status and enable registers in this GPE |
355 | * block, saving all of them. Find all currently active GP events. | |
1da177e4 LT |
356 | */ |
357 | for (i = 0; i < gpe_block->register_count; i++) { | |
52fc0b02 | 358 | |
1da177e4 LT |
359 | /* Get the next status/enable pair */ |
360 | ||
361 | gpe_register_info = &gpe_block->register_info[i]; | |
362 | ||
363 | /* Read the Status Register */ | |
364 | ||
4be44fcd | 365 | status = |
c6b5774c BM |
366 | acpi_hw_read(&status_reg, |
367 | &gpe_register_info->status_address); | |
4be44fcd | 368 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
369 | goto unlock_and_exit; |
370 | } | |
371 | ||
372 | /* Read the Enable Register */ | |
373 | ||
4be44fcd | 374 | status = |
c6b5774c BM |
375 | acpi_hw_read(&enable_reg, |
376 | &gpe_register_info->enable_address); | |
4be44fcd | 377 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
378 | goto unlock_and_exit; |
379 | } | |
380 | ||
4be44fcd LB |
381 | ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, |
382 | "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n", | |
383 | gpe_register_info->base_gpe_number, | |
384 | status_reg, enable_reg)); | |
1da177e4 | 385 | |
44f6c012 | 386 | /* Check if there is anything active at all in this register */ |
1da177e4 LT |
387 | |
388 | enabled_status_byte = (u8) (status_reg & enable_reg); | |
389 | if (!enabled_status_byte) { | |
52fc0b02 | 390 | |
1da177e4 LT |
391 | /* No active GPEs in this register, move on */ |
392 | ||
393 | continue; | |
394 | } | |
395 | ||
396 | /* Now look at the individual GPEs in this byte register */ | |
397 | ||
398 | for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { | |
52fc0b02 | 399 | |
1da177e4 LT |
400 | /* Examine one GPE bit */ |
401 | ||
69874165 | 402 | if (enabled_status_byte & (1 << j)) { |
1da177e4 LT |
403 | /* |
404 | * Found an active GPE. Dispatch the event to a handler | |
405 | * or method. | |
406 | */ | |
4be44fcd LB |
407 | int_status |= |
408 | acpi_ev_gpe_dispatch(&gpe_block-> | |
67a119f9 | 409 | event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number); |
1da177e4 LT |
410 | } |
411 | } | |
412 | } | |
413 | ||
414 | gpe_block = gpe_block->next; | |
415 | } | |
416 | ||
4be44fcd | 417 | unlock_and_exit: |
1da177e4 | 418 | |
4be44fcd | 419 | acpi_os_release_lock(acpi_gbl_gpe_lock, flags); |
1da177e4 LT |
420 | return (int_status); |
421 | } | |
422 | ||
1da177e4 LT |
423 | /******************************************************************************* |
424 | * | |
425 | * FUNCTION: acpi_ev_asynch_execute_gpe_method | |
426 | * | |
427 | * PARAMETERS: Context (gpe_event_info) - Info for this GPE | |
428 | * | |
429 | * RETURN: None | |
430 | * | |
4119532c BM |
431 | * DESCRIPTION: Perform the actual execution of a GPE control method. This |
432 | * function is called from an invocation of acpi_os_execute and | |
433 | * therefore does NOT execute at interrupt level - so that | |
1da177e4 LT |
434 | * the control method itself is not executed in the context of |
435 | * an interrupt handler. | |
436 | * | |
437 | ******************************************************************************/ | |
17bc54ee | 438 | static void acpi_ev_asynch_enable_gpe(void *context); |
1da177e4 | 439 | |
4be44fcd | 440 | static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context) |
1da177e4 | 441 | { |
4be44fcd | 442 | struct acpi_gpe_event_info *gpe_event_info = (void *)context; |
4be44fcd LB |
443 | acpi_status status; |
444 | struct acpi_gpe_event_info local_gpe_event_info; | |
4119532c | 445 | struct acpi_evaluate_info *info; |
1da177e4 | 446 | |
b229cf92 | 447 | ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method); |
1da177e4 | 448 | |
4be44fcd LB |
449 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); |
450 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
451 | return_VOID; |
452 | } | |
453 | ||
454 | /* Must revalidate the gpe_number/gpe_block */ | |
455 | ||
4be44fcd LB |
456 | if (!acpi_ev_valid_gpe_event(gpe_event_info)) { |
457 | status = acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
1da177e4 LT |
458 | return_VOID; |
459 | } | |
460 | ||
1da177e4 | 461 | /* |
9f15fc66 BM |
462 | * Take a snapshot of the GPE info for this level - we copy the info to |
463 | * prevent a race condition with remove_handler/remove_block. | |
1da177e4 | 464 | */ |
4be44fcd LB |
465 | ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info, |
466 | sizeof(struct acpi_gpe_event_info)); | |
1da177e4 | 467 | |
4be44fcd LB |
468 | status = acpi_ut_release_mutex(ACPI_MTX_EVENTS); |
469 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
470 | return_VOID; |
471 | } | |
472 | ||
473 | /* | |
9f15fc66 BM |
474 | * Must check for control method type dispatch one more time to avoid a |
475 | * race with ev_gpe_install_handler | |
1da177e4 | 476 | */ |
44f6c012 | 477 | if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) == |
4be44fcd | 478 | ACPI_GPE_DISPATCH_METHOD) { |
1da177e4 | 479 | |
4119532c BM |
480 | /* Allocate the evaluation information block */ |
481 | ||
482 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); | |
483 | if (!info) { | |
484 | status = AE_NO_MEMORY; | |
485 | } else { | |
486 | /* | |
487 | * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx | |
488 | * control method that corresponds to this GPE | |
489 | */ | |
490 | info->prefix_node = | |
491 | local_gpe_event_info.dispatch.method_node; | |
4119532c BM |
492 | info->flags = ACPI_IGNORE_RETURN_VALUE; |
493 | ||
494 | status = acpi_ns_evaluate(info); | |
495 | ACPI_FREE(info); | |
496 | } | |
497 | ||
4be44fcd | 498 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 499 | ACPI_EXCEPTION((AE_INFO, status, |
2e42005b | 500 | "while evaluating GPE method [%4.4s]", |
b8e4d893 BM |
501 | acpi_ut_get_node_name |
502 | (local_gpe_event_info.dispatch. | |
4c90ece2 | 503 | method_node))); |
1da177e4 LT |
504 | } |
505 | } | |
17bc54ee AS |
506 | /* Defer enabling of GPE until all notify handlers are done */ |
507 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe, | |
508 | gpe_event_info); | |
509 | return_VOID; | |
510 | } | |
1da177e4 | 511 | |
17bc54ee AS |
512 | static void acpi_ev_asynch_enable_gpe(void *context) |
513 | { | |
514 | struct acpi_gpe_event_info *gpe_event_info = context; | |
515 | acpi_status status; | |
516 | if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == | |
4be44fcd | 517 | ACPI_GPE_LEVEL_TRIGGERED) { |
1da177e4 | 518 | /* |
9f15fc66 BM |
519 | * GPE is level-triggered, we clear the GPE status bit after handling |
520 | * the event. | |
1da177e4 | 521 | */ |
17bc54ee | 522 | status = acpi_hw_clear_gpe(gpe_event_info); |
4be44fcd | 523 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
524 | return_VOID; |
525 | } | |
526 | } | |
527 | ||
de5668fe BM |
528 | /* |
529 | * Enable this GPE, conditionally. This means that the GPE will only be | |
530 | * physically enabled if the enable_for_run bit is set in the event_info | |
531 | */ | |
532 | (void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_COND_ENABLE); | |
533 | ||
1da177e4 LT |
534 | return_VOID; |
535 | } | |
536 | ||
1da177e4 LT |
537 | /******************************************************************************* |
538 | * | |
539 | * FUNCTION: acpi_ev_gpe_dispatch | |
540 | * | |
44f6c012 | 541 | * PARAMETERS: gpe_event_info - Info for this GPE |
1da177e4 LT |
542 | * gpe_number - Number relative to the parent GPE block |
543 | * | |
544 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED | |
545 | * | |
546 | * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) | |
547 | * or method (e.g. _Lxx/_Exx) handler. | |
548 | * | |
549 | * This function executes at interrupt level. | |
550 | * | |
551 | ******************************************************************************/ | |
552 | ||
553 | u32 | |
4be44fcd | 554 | acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number) |
1da177e4 | 555 | { |
4be44fcd | 556 | acpi_status status; |
1da177e4 | 557 | |
b229cf92 | 558 | ACPI_FUNCTION_TRACE(ev_gpe_dispatch); |
1da177e4 | 559 | |
5229e87d | 560 | acpi_os_gpe_count(gpe_number); |
fdffb72d | 561 | |
1da177e4 | 562 | /* |
9f15fc66 | 563 | * If edge-triggered, clear the GPE status bit now. Note that |
1da177e4 LT |
564 | * level-triggered events are cleared after the GPE is serviced. |
565 | */ | |
44f6c012 | 566 | if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == |
4be44fcd LB |
567 | ACPI_GPE_EDGE_TRIGGERED) { |
568 | status = acpi_hw_clear_gpe(gpe_event_info); | |
569 | if (ACPI_FAILURE(status)) { | |
b8e4d893 | 570 | ACPI_EXCEPTION((AE_INFO, status, |
f6a22b0b | 571 | "Unable to clear GPE[0x%2X]", |
b8e4d893 | 572 | gpe_number)); |
50eca3eb | 573 | return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); |
1da177e4 LT |
574 | } |
575 | } | |
576 | ||
1da177e4 | 577 | /* |
c5a71569 BM |
578 | * Dispatch the GPE to either an installed handler, or the control method |
579 | * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke | |
580 | * it and do not attempt to run the method. If there is neither a handler | |
581 | * nor a method, we disable this GPE to prevent further such pointless | |
582 | * events from firing. | |
1da177e4 LT |
583 | */ |
584 | switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) { | |
585 | case ACPI_GPE_DISPATCH_HANDLER: | |
586 | ||
587 | /* | |
588 | * Invoke the installed handler (at interrupt level) | |
9f15fc66 BM |
589 | * Ignore return status for now. |
590 | * TBD: leave GPE disabled on error? | |
1da177e4 | 591 | */ |
4be44fcd LB |
592 | (void)gpe_event_info->dispatch.handler->address(gpe_event_info-> |
593 | dispatch. | |
594 | handler-> | |
595 | context); | |
1da177e4 LT |
596 | |
597 | /* It is now safe to clear level-triggered events. */ | |
598 | ||
44f6c012 | 599 | if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) == |
4be44fcd LB |
600 | ACPI_GPE_LEVEL_TRIGGERED) { |
601 | status = acpi_hw_clear_gpe(gpe_event_info); | |
602 | if (ACPI_FAILURE(status)) { | |
b8e4d893 | 603 | ACPI_EXCEPTION((AE_INFO, status, |
f6a22b0b | 604 | "Unable to clear GPE[0x%2X]", |
b8e4d893 | 605 | gpe_number)); |
50eca3eb | 606 | return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); |
1da177e4 LT |
607 | } |
608 | } | |
609 | break; | |
610 | ||
611 | case ACPI_GPE_DISPATCH_METHOD: | |
612 | ||
613 | /* | |
c5a71569 BM |
614 | * Disable the GPE, so it doesn't keep firing before the method has a |
615 | * chance to run (it runs asynchronously with interrupts enabled). | |
1da177e4 | 616 | */ |
fd247447 | 617 | status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); |
4be44fcd | 618 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 619 | ACPI_EXCEPTION((AE_INFO, status, |
f6a22b0b | 620 | "Unable to disable GPE[0x%2X]", |
b8e4d893 | 621 | gpe_number)); |
50eca3eb | 622 | return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); |
1da177e4 LT |
623 | } |
624 | ||
625 | /* | |
626 | * Execute the method associated with the GPE | |
627 | * NOTE: Level-triggered GPEs are cleared after the method completes. | |
628 | */ | |
958dd242 BM |
629 | status = acpi_os_execute(OSL_GPE_HANDLER, |
630 | acpi_ev_asynch_execute_gpe_method, | |
631 | gpe_event_info); | |
4be44fcd | 632 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 633 | ACPI_EXCEPTION((AE_INFO, status, |
f6a22b0b | 634 | "Unable to queue handler for GPE[0x%2X] - event disabled", |
b8e4d893 | 635 | gpe_number)); |
1da177e4 LT |
636 | } |
637 | break; | |
638 | ||
639 | default: | |
640 | ||
0f849d2c LM |
641 | /* |
642 | * No handler or method to run! | |
643 | * 03/2010: This case should no longer be possible. We will not allow | |
644 | * a GPE to be enabled if it has no handler or method. | |
645 | */ | |
b8e4d893 | 646 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 647 | "No handler or method for GPE[0x%2X], disabling event", |
b8e4d893 | 648 | gpe_number)); |
1da177e4 LT |
649 | |
650 | /* | |
0f849d2c LM |
651 | * Disable the GPE. The GPE will remain disabled a handler |
652 | * is installed or ACPICA is restarted. | |
1da177e4 | 653 | */ |
fd247447 | 654 | status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE); |
4be44fcd | 655 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 656 | ACPI_EXCEPTION((AE_INFO, status, |
f6a22b0b | 657 | "Unable to disable GPE[0x%2X]", |
b8e4d893 | 658 | gpe_number)); |
50eca3eb | 659 | return_UINT32(ACPI_INTERRUPT_NOT_HANDLED); |
1da177e4 LT |
660 | } |
661 | break; | |
662 | } | |
663 | ||
50eca3eb | 664 | return_UINT32(ACPI_INTERRUPT_HANDLED); |
1da177e4 | 665 | } |