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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evmisc - Miscellaneous event manager support functions | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
6c9deb72 | 8 | * Copyright (C) 2000 - 2007, R. Byron Moore |
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> | |
45 | #include <acpi/acevents.h> | |
46 | #include <acpi/acnamesp.h> | |
47 | #include <acpi/acinterp.h> | |
48 | ||
49 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 50 | ACPI_MODULE_NAME("evmisc") |
1da177e4 | 51 | |
4119532c | 52 | /* Names for Notify() values, used for debug output */ |
44f6c012 | 53 | #ifdef ACPI_DEBUG_OUTPUT |
4be44fcd | 54 | static const char *acpi_notify_value_names[] = { |
44f6c012 RM |
55 | "Bus Check", |
56 | "Device Check", | |
57 | "Device Wake", | |
4119532c | 58 | "Eject Request", |
44f6c012 RM |
59 | "Device Check Light", |
60 | "Frequency Mismatch", | |
61 | "Bus Mode Mismatch", | |
62 | "Power Fault" | |
63 | }; | |
64 | #endif | |
65 | ||
f3d2e786 BM |
66 | /* Pointer to FACS needed for the Global Lock */ |
67 | ||
68 | static struct acpi_table_facs *facs = NULL; | |
69 | ||
44f6c012 RM |
70 | /* Local prototypes */ |
71 | ||
4be44fcd | 72 | static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context); |
44f6c012 | 73 | |
4be44fcd | 74 | static u32 acpi_ev_global_lock_handler(void *context); |
44f6c012 | 75 | |
8876016b BM |
76 | static acpi_status acpi_ev_remove_global_lock_handler(void); |
77 | ||
1da177e4 LT |
78 | /******************************************************************************* |
79 | * | |
80 | * FUNCTION: acpi_ev_is_notify_object | |
81 | * | |
82 | * PARAMETERS: Node - Node to check | |
83 | * | |
84 | * RETURN: TRUE if notifies allowed on this object | |
85 | * | |
86 | * DESCRIPTION: Check type of node for a object that supports notifies. | |
87 | * | |
88 | * TBD: This could be replaced by a flag bit in the node. | |
89 | * | |
90 | ******************************************************************************/ | |
91 | ||
4be44fcd | 92 | u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node) |
1da177e4 LT |
93 | { |
94 | switch (node->type) { | |
95 | case ACPI_TYPE_DEVICE: | |
96 | case ACPI_TYPE_PROCESSOR: | |
97 | case ACPI_TYPE_POWER: | |
98 | case ACPI_TYPE_THERMAL: | |
99 | /* | |
100 | * These are the ONLY objects that can receive ACPI notifications | |
101 | */ | |
102 | return (TRUE); | |
103 | ||
104 | default: | |
105 | return (FALSE); | |
106 | } | |
107 | } | |
108 | ||
1da177e4 LT |
109 | /******************************************************************************* |
110 | * | |
111 | * FUNCTION: acpi_ev_queue_notify_request | |
112 | * | |
113 | * PARAMETERS: Node - NS node for the notified object | |
114 | * notify_value - Value from the Notify() request | |
115 | * | |
116 | * RETURN: Status | |
117 | * | |
118 | * DESCRIPTION: Dispatch a device notification event to a previously | |
119 | * installed handler. | |
120 | * | |
121 | ******************************************************************************/ | |
122 | ||
1da177e4 | 123 | acpi_status |
4be44fcd LB |
124 | acpi_ev_queue_notify_request(struct acpi_namespace_node * node, |
125 | u32 notify_value) | |
1da177e4 | 126 | { |
4be44fcd LB |
127 | union acpi_operand_object *obj_desc; |
128 | union acpi_operand_object *handler_obj = NULL; | |
129 | union acpi_generic_state *notify_info; | |
130 | acpi_status status = AE_OK; | |
1da177e4 | 131 | |
b229cf92 | 132 | ACPI_FUNCTION_NAME(ev_queue_notify_request); |
1da177e4 LT |
133 | |
134 | /* | |
135 | * For value 3 (Ejection Request), some device method may need to be run. | |
44f6c012 RM |
136 | * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need |
137 | * to be run. | |
1da177e4 | 138 | * For value 0x80 (Status Change) on the power button or sleep button, |
44f6c012 | 139 | * initiate soft-off or sleep operation? |
1da177e4 | 140 | */ |
4be44fcd LB |
141 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
142 | "Dispatching Notify(%X) on node %p\n", notify_value, | |
143 | node)); | |
1da177e4 LT |
144 | |
145 | if (notify_value <= 7) { | |
4be44fcd LB |
146 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notify value: %s\n", |
147 | acpi_notify_value_names[notify_value])); | |
148 | } else { | |
149 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
150 | "Notify value: 0x%2.2X **Device Specific**\n", | |
151 | notify_value)); | |
1da177e4 LT |
152 | } |
153 | ||
154 | /* Get the notify object attached to the NS Node */ | |
155 | ||
4be44fcd | 156 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 157 | if (obj_desc) { |
52fc0b02 | 158 | |
1da177e4 LT |
159 | /* We have the notify object, Get the right handler */ |
160 | ||
161 | switch (node->type) { | |
162 | case ACPI_TYPE_DEVICE: | |
163 | case ACPI_TYPE_THERMAL: | |
164 | case ACPI_TYPE_PROCESSOR: | |
165 | case ACPI_TYPE_POWER: | |
166 | ||
167 | if (notify_value <= ACPI_MAX_SYS_NOTIFY) { | |
4be44fcd LB |
168 | handler_obj = |
169 | obj_desc->common_notify.system_notify; | |
170 | } else { | |
171 | handler_obj = | |
172 | obj_desc->common_notify.device_notify; | |
1da177e4 LT |
173 | } |
174 | break; | |
175 | ||
176 | default: | |
177 | /* All other types are not supported */ | |
178 | return (AE_TYPE); | |
179 | } | |
180 | } | |
181 | ||
182 | /* If there is any handler to run, schedule the dispatcher */ | |
183 | ||
4be44fcd LB |
184 | if ((acpi_gbl_system_notify.handler |
185 | && (notify_value <= ACPI_MAX_SYS_NOTIFY)) | |
186 | || (acpi_gbl_device_notify.handler | |
187 | && (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) { | |
188 | notify_info = acpi_ut_create_generic_state(); | |
1da177e4 LT |
189 | if (!notify_info) { |
190 | return (AE_NO_MEMORY); | |
191 | } | |
192 | ||
61686124 BM |
193 | notify_info->common.descriptor_type = |
194 | ACPI_DESC_TYPE_STATE_NOTIFY; | |
4be44fcd LB |
195 | notify_info->notify.node = node; |
196 | notify_info->notify.value = (u16) notify_value; | |
1da177e4 LT |
197 | notify_info->notify.handler_obj = handler_obj; |
198 | ||
40d07080 LB |
199 | status = |
200 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch, | |
201 | notify_info); | |
202 | if (ACPI_FAILURE(status)) { | |
203 | acpi_ut_delete_generic_state(notify_info); | |
204 | } | |
1da177e4 LT |
205 | } |
206 | ||
207 | if (!handler_obj) { | |
208 | /* | |
209 | * There is no per-device notify handler for this device. | |
210 | * This may or may not be a problem. | |
211 | */ | |
4be44fcd LB |
212 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
213 | "No notify handler for Notify(%4.4s, %X) node %p\n", | |
214 | acpi_ut_get_node_name(node), notify_value, | |
215 | node)); | |
1da177e4 LT |
216 | } |
217 | ||
218 | return (status); | |
219 | } | |
220 | ||
1da177e4 LT |
221 | /******************************************************************************* |
222 | * | |
223 | * FUNCTION: acpi_ev_notify_dispatch | |
224 | * | |
44f6c012 | 225 | * PARAMETERS: Context - To be passed to the notify handler |
1da177e4 LT |
226 | * |
227 | * RETURN: None. | |
228 | * | |
229 | * DESCRIPTION: Dispatch a device notification event to a previously | |
230 | * installed handler. | |
231 | * | |
232 | ******************************************************************************/ | |
233 | ||
4be44fcd | 234 | static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context) |
1da177e4 | 235 | { |
4be44fcd LB |
236 | union acpi_generic_state *notify_info = |
237 | (union acpi_generic_state *)context; | |
238 | acpi_notify_handler global_handler = NULL; | |
239 | void *global_context = NULL; | |
240 | union acpi_operand_object *handler_obj; | |
1da177e4 | 241 | |
4be44fcd | 242 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
243 | |
244 | /* | |
245 | * We will invoke a global notify handler if installed. | |
44f6c012 RM |
246 | * This is done _before_ we invoke the per-device handler attached |
247 | * to the device. | |
1da177e4 LT |
248 | */ |
249 | if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) { | |
52fc0b02 | 250 | |
1da177e4 LT |
251 | /* Global system notification handler */ |
252 | ||
253 | if (acpi_gbl_system_notify.handler) { | |
254 | global_handler = acpi_gbl_system_notify.handler; | |
255 | global_context = acpi_gbl_system_notify.context; | |
256 | } | |
4be44fcd | 257 | } else { |
1da177e4 LT |
258 | /* Global driver notification handler */ |
259 | ||
260 | if (acpi_gbl_device_notify.handler) { | |
261 | global_handler = acpi_gbl_device_notify.handler; | |
262 | global_context = acpi_gbl_device_notify.context; | |
263 | } | |
264 | } | |
265 | ||
266 | /* Invoke the system handler first, if present */ | |
267 | ||
268 | if (global_handler) { | |
4be44fcd LB |
269 | global_handler(notify_info->notify.node, |
270 | notify_info->notify.value, global_context); | |
1da177e4 LT |
271 | } |
272 | ||
273 | /* Now invoke the per-device handler, if present */ | |
274 | ||
275 | handler_obj = notify_info->notify.handler_obj; | |
276 | if (handler_obj) { | |
4be44fcd LB |
277 | handler_obj->notify.handler(notify_info->notify.node, |
278 | notify_info->notify.value, | |
279 | handler_obj->notify.context); | |
1da177e4 LT |
280 | } |
281 | ||
282 | /* All done with the info object */ | |
283 | ||
4be44fcd | 284 | acpi_ut_delete_generic_state(notify_info); |
1da177e4 LT |
285 | } |
286 | ||
1da177e4 LT |
287 | /******************************************************************************* |
288 | * | |
289 | * FUNCTION: acpi_ev_global_lock_handler | |
290 | * | |
291 | * PARAMETERS: Context - From thread interface, not used | |
292 | * | |
a72d4756 | 293 | * RETURN: ACPI_INTERRUPT_HANDLED |
1da177e4 LT |
294 | * |
295 | * DESCRIPTION: Invoked directly from the SCI handler when a global lock | |
a72d4756 BM |
296 | * release interrupt occurs. Attempt to acquire the global lock, |
297 | * if successful, signal the thread waiting for the lock. | |
298 | * | |
299 | * NOTE: Assumes that the semaphore can be signaled from interrupt level. If | |
300 | * this is not possible for some reason, a separate thread will have to be | |
301 | * scheduled to do this. | |
1da177e4 LT |
302 | * |
303 | ******************************************************************************/ | |
304 | ||
4be44fcd | 305 | static u32 acpi_ev_global_lock_handler(void *context) |
1da177e4 | 306 | { |
4be44fcd | 307 | u8 acquired = FALSE; |
1da177e4 LT |
308 | |
309 | /* | |
c81da666 BM |
310 | * Attempt to get the lock. |
311 | * | |
1da177e4 LT |
312 | * If we don't get it now, it will be marked pending and we will |
313 | * take another interrupt when it becomes free. | |
314 | */ | |
f3d2e786 | 315 | ACPI_ACQUIRE_GLOBAL_LOCK(facs, acquired); |
1da177e4 | 316 | if (acquired) { |
52fc0b02 | 317 | |
1da177e4 | 318 | /* Got the lock, now wake all threads waiting for it */ |
c81da666 | 319 | |
1da177e4 | 320 | acpi_gbl_global_lock_acquired = TRUE; |
a72d4756 BM |
321 | /* Send a unit to the semaphore */ |
322 | ||
fd350943 LB |
323 | if (ACPI_FAILURE |
324 | (acpi_os_signal_semaphore | |
325 | (acpi_gbl_global_lock_semaphore, 1))) { | |
a72d4756 BM |
326 | ACPI_ERROR((AE_INFO, |
327 | "Could not signal Global Lock semaphore")); | |
328 | } | |
1da177e4 LT |
329 | } |
330 | ||
331 | return (ACPI_INTERRUPT_HANDLED); | |
332 | } | |
333 | ||
1da177e4 LT |
334 | /******************************************************************************* |
335 | * | |
336 | * FUNCTION: acpi_ev_init_global_lock_handler | |
337 | * | |
338 | * PARAMETERS: None | |
339 | * | |
340 | * RETURN: Status | |
341 | * | |
342 | * DESCRIPTION: Install a handler for the global lock release event | |
343 | * | |
344 | ******************************************************************************/ | |
345 | ||
4be44fcd | 346 | acpi_status acpi_ev_init_global_lock_handler(void) |
1da177e4 | 347 | { |
4be44fcd | 348 | acpi_status status; |
1da177e4 | 349 | |
b229cf92 | 350 | ACPI_FUNCTION_TRACE(ev_init_global_lock_handler); |
1da177e4 | 351 | |
f3d2e786 | 352 | status = |
310a7f7f BM |
353 | acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, |
354 | (struct acpi_table_header **)&facs); | |
f3d2e786 BM |
355 | if (ACPI_FAILURE(status)) { |
356 | return_ACPI_STATUS(status); | |
357 | } | |
358 | ||
1da177e4 | 359 | acpi_gbl_global_lock_present = TRUE; |
4be44fcd LB |
360 | status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL, |
361 | acpi_ev_global_lock_handler, | |
362 | NULL); | |
1da177e4 LT |
363 | |
364 | /* | |
365 | * If the global lock does not exist on this platform, the attempt | |
366 | * to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick) | |
367 | * Map to AE_OK, but mark global lock as not present. | |
368 | * Any attempt to actually use the global lock will be flagged | |
369 | * with an error. | |
370 | */ | |
371 | if (status == AE_NO_HARDWARE_RESPONSE) { | |
b8e4d893 BM |
372 | ACPI_ERROR((AE_INFO, |
373 | "No response from Global Lock hardware, disabling lock")); | |
0c9938cc | 374 | |
1da177e4 LT |
375 | acpi_gbl_global_lock_present = FALSE; |
376 | status = AE_OK; | |
377 | } | |
378 | ||
4be44fcd | 379 | return_ACPI_STATUS(status); |
1da177e4 LT |
380 | } |
381 | ||
8876016b BM |
382 | /******************************************************************************* |
383 | * | |
384 | * FUNCTION: acpi_ev_remove_global_lock_handler | |
385 | * | |
386 | * PARAMETERS: None | |
387 | * | |
388 | * RETURN: Status | |
389 | * | |
390 | * DESCRIPTION: Remove the handler for the Global Lock | |
391 | * | |
392 | ******************************************************************************/ | |
393 | ||
394 | static acpi_status acpi_ev_remove_global_lock_handler(void) | |
395 | { | |
396 | acpi_status status; | |
397 | ||
398 | ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler); | |
399 | ||
400 | acpi_gbl_global_lock_present = FALSE; | |
401 | status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL, | |
402 | acpi_ev_global_lock_handler); | |
403 | ||
404 | return_ACPI_STATUS(status); | |
405 | } | |
406 | ||
1da177e4 LT |
407 | /****************************************************************************** |
408 | * | |
409 | * FUNCTION: acpi_ev_acquire_global_lock | |
410 | * | |
411 | * PARAMETERS: Timeout - Max time to wait for the lock, in millisec. | |
412 | * | |
413 | * RETURN: Status | |
414 | * | |
415 | * DESCRIPTION: Attempt to gain ownership of the Global Lock. | |
416 | * | |
c81da666 BM |
417 | * MUTEX: Interpreter must be locked |
418 | * | |
419 | * Note: The original implementation allowed multiple threads to "acquire" the | |
420 | * Global Lock, and the OS would hold the lock until the last thread had | |
421 | * released it. However, this could potentially starve the BIOS out of the | |
422 | * lock, especially in the case where there is a tight handshake between the | |
423 | * Embedded Controller driver and the BIOS. Therefore, this implementation | |
424 | * allows only one thread to acquire the HW Global Lock at a time, and makes | |
425 | * the global lock appear as a standard mutex on the OS side. | |
426 | * | |
1da177e4 | 427 | *****************************************************************************/ |
610a3d06 AS |
428 | static acpi_thread_id acpi_ev_global_lock_thread_id; |
429 | static int acpi_ev_global_lock_acquired; | |
1da177e4 | 430 | |
4be44fcd | 431 | acpi_status acpi_ev_acquire_global_lock(u16 timeout) |
1da177e4 | 432 | { |
4be44fcd LB |
433 | acpi_status status = AE_OK; |
434 | u8 acquired = FALSE; | |
1da177e4 | 435 | |
b229cf92 | 436 | ACPI_FUNCTION_TRACE(ev_acquire_global_lock); |
1da177e4 | 437 | |
c81da666 BM |
438 | /* |
439 | * Only one thread can acquire the GL at a time, the global_lock_mutex | |
440 | * enforces this. This interface releases the interpreter if we must wait. | |
441 | */ | |
610a3d06 AS |
442 | status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, 0); |
443 | if (status == AE_TIME) { | |
444 | if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) { | |
445 | acpi_ev_global_lock_acquired++; | |
446 | return AE_OK; | |
447 | } | |
448 | } | |
449 | ||
450 | if (ACPI_FAILURE(status)) { | |
fd350943 LB |
451 | status = |
452 | acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, | |
453 | timeout); | |
610a3d06 | 454 | } |
c81da666 BM |
455 | if (ACPI_FAILURE(status)) { |
456 | return_ACPI_STATUS(status); | |
1da177e4 | 457 | } |
1da177e4 | 458 | |
610a3d06 AS |
459 | acpi_ev_global_lock_thread_id = acpi_os_get_thread_id(); |
460 | acpi_ev_global_lock_acquired++; | |
461 | ||
44f6c012 | 462 | /* |
c81da666 BM |
463 | * Make sure that a global lock actually exists. If not, just treat |
464 | * the lock as a standard mutex. | |
44f6c012 | 465 | */ |
c81da666 BM |
466 | if (!acpi_gbl_global_lock_present) { |
467 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 468 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
469 | } |
470 | ||
c81da666 | 471 | /* Attempt to acquire the actual hardware lock */ |
1da177e4 | 472 | |
f3d2e786 | 473 | ACPI_ACQUIRE_GLOBAL_LOCK(facs, acquired); |
1da177e4 | 474 | if (acquired) { |
52fc0b02 | 475 | |
4be44fcd | 476 | /* We got the lock */ |
1da177e4 | 477 | |
4be44fcd | 478 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
c81da666 | 479 | "Acquired hardware Global Lock\n")); |
1da177e4 LT |
480 | |
481 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 482 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
483 | } |
484 | ||
485 | /* | |
c81da666 | 486 | * Did not get the lock. The pending bit was set above, and we must now |
1da177e4 LT |
487 | * wait until we get the global lock released interrupt. |
488 | */ | |
c81da666 | 489 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n")); |
1da177e4 LT |
490 | |
491 | /* | |
c81da666 BM |
492 | * Wait for handshake with the global lock interrupt handler. |
493 | * This interface releases the interpreter if we must wait. | |
1da177e4 | 494 | */ |
c81da666 BM |
495 | status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore, |
496 | ACPI_WAIT_FOREVER); | |
f3d2e786 | 497 | |
4be44fcd | 498 | return_ACPI_STATUS(status); |
1da177e4 LT |
499 | } |
500 | ||
1da177e4 LT |
501 | /******************************************************************************* |
502 | * | |
503 | * FUNCTION: acpi_ev_release_global_lock | |
504 | * | |
505 | * PARAMETERS: None | |
506 | * | |
507 | * RETURN: Status | |
508 | * | |
509 | * DESCRIPTION: Releases ownership of the Global Lock. | |
510 | * | |
511 | ******************************************************************************/ | |
512 | ||
4be44fcd | 513 | acpi_status acpi_ev_release_global_lock(void) |
1da177e4 | 514 | { |
4be44fcd LB |
515 | u8 pending = FALSE; |
516 | acpi_status status = AE_OK; | |
1da177e4 | 517 | |
b229cf92 | 518 | ACPI_FUNCTION_TRACE(ev_release_global_lock); |
1da177e4 | 519 | |
a72d4756 | 520 | /* Lock must be already acquired */ |
c81da666 BM |
521 | |
522 | if (!acpi_gbl_global_lock_acquired) { | |
b8e4d893 | 523 | ACPI_WARNING((AE_INFO, |
c81da666 | 524 | "Cannot release the ACPI Global Lock, it has not been acquired")); |
4be44fcd | 525 | return_ACPI_STATUS(AE_NOT_ACQUIRED); |
1da177e4 LT |
526 | } |
527 | ||
610a3d06 AS |
528 | acpi_ev_global_lock_acquired--; |
529 | if (acpi_ev_global_lock_acquired > 0) { | |
530 | return AE_OK; | |
531 | } | |
532 | ||
c81da666 | 533 | if (acpi_gbl_global_lock_present) { |
1da177e4 | 534 | |
c81da666 | 535 | /* Allow any thread to release the lock */ |
52fc0b02 | 536 | |
f3d2e786 | 537 | ACPI_RELEASE_GLOBAL_LOCK(facs, pending); |
1da177e4 | 538 | |
c81da666 BM |
539 | /* |
540 | * If the pending bit was set, we must write GBL_RLS to the control | |
541 | * register | |
542 | */ | |
543 | if (pending) { | |
544 | status = | |
545 | acpi_set_register(ACPI_BITREG_GLOBAL_LOCK_RELEASE, | |
d8c71b6d | 546 | 1); |
c81da666 BM |
547 | } |
548 | ||
549 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
550 | "Released hardware Global Lock\n")); | |
1da177e4 LT |
551 | } |
552 | ||
1da177e4 LT |
553 | acpi_gbl_global_lock_acquired = FALSE; |
554 | ||
c81da666 | 555 | /* Release the local GL mutex */ |
89952d13 | 556 | acpi_ev_global_lock_thread_id = NULL; |
610a3d06 | 557 | acpi_ev_global_lock_acquired = 0; |
c81da666 | 558 | acpi_os_release_mutex(acpi_gbl_global_lock_mutex); |
4be44fcd | 559 | return_ACPI_STATUS(status); |
1da177e4 LT |
560 | } |
561 | ||
1da177e4 LT |
562 | /****************************************************************************** |
563 | * | |
564 | * FUNCTION: acpi_ev_terminate | |
565 | * | |
566 | * PARAMETERS: none | |
567 | * | |
568 | * RETURN: none | |
569 | * | |
570 | * DESCRIPTION: Disable events and free memory allocated for table storage. | |
571 | * | |
572 | ******************************************************************************/ | |
573 | ||
4be44fcd | 574 | void acpi_ev_terminate(void) |
1da177e4 | 575 | { |
4be44fcd LB |
576 | acpi_native_uint i; |
577 | acpi_status status; | |
1da177e4 | 578 | |
b229cf92 | 579 | ACPI_FUNCTION_TRACE(ev_terminate); |
1da177e4 LT |
580 | |
581 | if (acpi_gbl_events_initialized) { | |
582 | /* | |
583 | * Disable all event-related functionality. | |
584 | * In all cases, on error, print a message but obviously we don't abort. | |
585 | */ | |
586 | ||
587 | /* Disable all fixed events */ | |
588 | ||
589 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
4be44fcd LB |
590 | status = acpi_disable_event((u32) i, 0); |
591 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
592 | ACPI_ERROR((AE_INFO, |
593 | "Could not disable fixed event %d", | |
594 | (u32) i)); | |
1da177e4 LT |
595 | } |
596 | } | |
597 | ||
598 | /* Disable all GPEs in all GPE blocks */ | |
599 | ||
4be44fcd | 600 | status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block); |
1da177e4 LT |
601 | |
602 | /* Remove SCI handler */ | |
603 | ||
4be44fcd | 604 | status = acpi_ev_remove_sci_handler(); |
1da177e4 | 605 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 606 | ACPI_ERROR((AE_INFO, "Could not remove SCI handler")); |
1da177e4 | 607 | } |
8876016b BM |
608 | |
609 | status = acpi_ev_remove_global_lock_handler(); | |
610 | if (ACPI_FAILURE(status)) { | |
611 | ACPI_ERROR((AE_INFO, | |
612 | "Could not remove Global Lock handler")); | |
613 | } | |
1da177e4 LT |
614 | } |
615 | ||
616 | /* Deallocate all handler objects installed within GPE info structs */ | |
617 | ||
4be44fcd | 618 | status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers); |
1da177e4 LT |
619 | |
620 | /* Return to original mode if necessary */ | |
621 | ||
622 | if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) { | |
4be44fcd LB |
623 | status = acpi_disable(); |
624 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 625 | ACPI_WARNING((AE_INFO, "AcpiDisable failed")); |
1da177e4 LT |
626 | } |
627 | } | |
628 | return_VOID; | |
629 | } |