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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evmisc - Miscellaneous event manager support functions | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
b4e104ea | 8 | * Copyright (C) 2000 - 2011, 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" | |
48 | #include "acinterp.h" | |
1da177e4 LT |
49 | |
50 | #define _COMPONENT ACPI_EVENTS | |
4be44fcd | 51 | ACPI_MODULE_NAME("evmisc") |
1da177e4 | 52 | |
44f6c012 | 53 | /* Local prototypes */ |
4be44fcd | 54 | static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context); |
44f6c012 | 55 | |
4be44fcd | 56 | static u32 acpi_ev_global_lock_handler(void *context); |
44f6c012 | 57 | |
8876016b BM |
58 | static acpi_status acpi_ev_remove_global_lock_handler(void); |
59 | ||
1da177e4 LT |
60 | /******************************************************************************* |
61 | * | |
62 | * FUNCTION: acpi_ev_is_notify_object | |
63 | * | |
64 | * PARAMETERS: Node - Node to check | |
65 | * | |
66 | * RETURN: TRUE if notifies allowed on this object | |
67 | * | |
68 | * DESCRIPTION: Check type of node for a object that supports notifies. | |
69 | * | |
70 | * TBD: This could be replaced by a flag bit in the node. | |
71 | * | |
72 | ******************************************************************************/ | |
73 | ||
4be44fcd | 74 | u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node) |
1da177e4 LT |
75 | { |
76 | switch (node->type) { | |
77 | case ACPI_TYPE_DEVICE: | |
78 | case ACPI_TYPE_PROCESSOR: | |
1da177e4 LT |
79 | case ACPI_TYPE_THERMAL: |
80 | /* | |
81 | * These are the ONLY objects that can receive ACPI notifications | |
82 | */ | |
83 | return (TRUE); | |
84 | ||
85 | default: | |
86 | return (FALSE); | |
87 | } | |
88 | } | |
89 | ||
1da177e4 LT |
90 | /******************************************************************************* |
91 | * | |
92 | * FUNCTION: acpi_ev_queue_notify_request | |
93 | * | |
94 | * PARAMETERS: Node - NS node for the notified object | |
95 | * notify_value - Value from the Notify() request | |
96 | * | |
97 | * RETURN: Status | |
98 | * | |
99 | * DESCRIPTION: Dispatch a device notification event to a previously | |
100 | * installed handler. | |
101 | * | |
102 | ******************************************************************************/ | |
103 | ||
1da177e4 | 104 | acpi_status |
4be44fcd LB |
105 | acpi_ev_queue_notify_request(struct acpi_namespace_node * node, |
106 | u32 notify_value) | |
1da177e4 | 107 | { |
4be44fcd LB |
108 | union acpi_operand_object *obj_desc; |
109 | union acpi_operand_object *handler_obj = NULL; | |
110 | union acpi_generic_state *notify_info; | |
111 | acpi_status status = AE_OK; | |
1da177e4 | 112 | |
b229cf92 | 113 | ACPI_FUNCTION_NAME(ev_queue_notify_request); |
1da177e4 LT |
114 | |
115 | /* | |
116 | * For value 3 (Ejection Request), some device method may need to be run. | |
44f6c012 RM |
117 | * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need |
118 | * to be run. | |
1da177e4 | 119 | * For value 0x80 (Status Change) on the power button or sleep button, |
44f6c012 | 120 | * initiate soft-off or sleep operation? |
1da177e4 | 121 | */ |
4be44fcd | 122 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
514d18d7 ZR |
123 | "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n", |
124 | acpi_ut_get_node_name(node), node, notify_value, | |
125 | acpi_ut_get_notify_name(notify_value))); | |
1da177e4 LT |
126 | |
127 | /* Get the notify object attached to the NS Node */ | |
128 | ||
4be44fcd | 129 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 130 | if (obj_desc) { |
52fc0b02 | 131 | |
1da177e4 LT |
132 | /* We have the notify object, Get the right handler */ |
133 | ||
134 | switch (node->type) { | |
514d18d7 ZR |
135 | |
136 | /* Notify allowed only on these types */ | |
137 | ||
1da177e4 LT |
138 | case ACPI_TYPE_DEVICE: |
139 | case ACPI_TYPE_THERMAL: | |
140 | case ACPI_TYPE_PROCESSOR: | |
1da177e4 LT |
141 | |
142 | if (notify_value <= ACPI_MAX_SYS_NOTIFY) { | |
4be44fcd LB |
143 | handler_obj = |
144 | obj_desc->common_notify.system_notify; | |
145 | } else { | |
146 | handler_obj = | |
147 | obj_desc->common_notify.device_notify; | |
1da177e4 LT |
148 | } |
149 | break; | |
150 | ||
151 | default: | |
9f15fc66 | 152 | |
1da177e4 | 153 | /* All other types are not supported */ |
9f15fc66 | 154 | |
1da177e4 LT |
155 | return (AE_TYPE); |
156 | } | |
157 | } | |
158 | ||
514d18d7 ZR |
159 | /* |
160 | * If there is any handler to run, schedule the dispatcher. | |
161 | * Check for: | |
162 | * 1) Global system notify handler | |
163 | * 2) Global device notify handler | |
164 | * 3) Per-device notify handler | |
165 | */ | |
d4913dc6 BM |
166 | if ((acpi_gbl_system_notify.handler && |
167 | (notify_value <= ACPI_MAX_SYS_NOTIFY)) || | |
168 | (acpi_gbl_device_notify.handler && | |
169 | (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) { | |
4be44fcd | 170 | notify_info = acpi_ut_create_generic_state(); |
1da177e4 LT |
171 | if (!notify_info) { |
172 | return (AE_NO_MEMORY); | |
173 | } | |
174 | ||
514d18d7 ZR |
175 | if (!handler_obj) { |
176 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
d4913dc6 BM |
177 | "Executing system notify handler for Notify (%4.4s, %X) " |
178 | "node %p\n", | |
514d18d7 ZR |
179 | acpi_ut_get_node_name(node), |
180 | notify_value, node)); | |
181 | } | |
182 | ||
61686124 BM |
183 | notify_info->common.descriptor_type = |
184 | ACPI_DESC_TYPE_STATE_NOTIFY; | |
4be44fcd LB |
185 | notify_info->notify.node = node; |
186 | notify_info->notify.value = (u16) notify_value; | |
1da177e4 LT |
187 | notify_info->notify.handler_obj = handler_obj; |
188 | ||
40d07080 LB |
189 | status = |
190 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch, | |
191 | notify_info); | |
192 | if (ACPI_FAILURE(status)) { | |
193 | acpi_ut_delete_generic_state(notify_info); | |
194 | } | |
514d18d7 | 195 | } else { |
9f15fc66 BM |
196 | /* There is no notify handler (per-device or system) for this device */ |
197 | ||
4be44fcd | 198 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
514d18d7 | 199 | "No notify handler for Notify (%4.4s, %X) node %p\n", |
4be44fcd LB |
200 | acpi_ut_get_node_name(node), notify_value, |
201 | node)); | |
1da177e4 LT |
202 | } |
203 | ||
204 | return (status); | |
205 | } | |
206 | ||
1da177e4 LT |
207 | /******************************************************************************* |
208 | * | |
209 | * FUNCTION: acpi_ev_notify_dispatch | |
210 | * | |
44f6c012 | 211 | * PARAMETERS: Context - To be passed to the notify handler |
1da177e4 LT |
212 | * |
213 | * RETURN: None. | |
214 | * | |
215 | * DESCRIPTION: Dispatch a device notification event to a previously | |
216 | * installed handler. | |
217 | * | |
218 | ******************************************************************************/ | |
219 | ||
4be44fcd | 220 | static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context) |
1da177e4 | 221 | { |
4be44fcd LB |
222 | union acpi_generic_state *notify_info = |
223 | (union acpi_generic_state *)context; | |
224 | acpi_notify_handler global_handler = NULL; | |
225 | void *global_context = NULL; | |
226 | union acpi_operand_object *handler_obj; | |
1da177e4 | 227 | |
4be44fcd | 228 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
229 | |
230 | /* | |
9f15fc66 BM |
231 | * We will invoke a global notify handler if installed. This is done |
232 | * _before_ we invoke the per-device handler attached to the device. | |
1da177e4 LT |
233 | */ |
234 | if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) { | |
52fc0b02 | 235 | |
1da177e4 LT |
236 | /* Global system notification handler */ |
237 | ||
238 | if (acpi_gbl_system_notify.handler) { | |
239 | global_handler = acpi_gbl_system_notify.handler; | |
240 | global_context = acpi_gbl_system_notify.context; | |
241 | } | |
4be44fcd | 242 | } else { |
1da177e4 LT |
243 | /* Global driver notification handler */ |
244 | ||
245 | if (acpi_gbl_device_notify.handler) { | |
246 | global_handler = acpi_gbl_device_notify.handler; | |
247 | global_context = acpi_gbl_device_notify.context; | |
248 | } | |
249 | } | |
250 | ||
251 | /* Invoke the system handler first, if present */ | |
252 | ||
253 | if (global_handler) { | |
4be44fcd LB |
254 | global_handler(notify_info->notify.node, |
255 | notify_info->notify.value, global_context); | |
1da177e4 LT |
256 | } |
257 | ||
258 | /* Now invoke the per-device handler, if present */ | |
259 | ||
260 | handler_obj = notify_info->notify.handler_obj; | |
261 | if (handler_obj) { | |
3f0be671 RW |
262 | struct acpi_object_notify_handler *notifier; |
263 | ||
264 | notifier = &handler_obj->notify; | |
265 | while (notifier) { | |
266 | notifier->handler(notify_info->notify.node, | |
267 | notify_info->notify.value, | |
268 | notifier->context); | |
269 | notifier = notifier->next; | |
270 | } | |
1da177e4 LT |
271 | } |
272 | ||
273 | /* All done with the info object */ | |
274 | ||
4be44fcd | 275 | acpi_ut_delete_generic_state(notify_info); |
1da177e4 LT |
276 | } |
277 | ||
1da177e4 LT |
278 | /******************************************************************************* |
279 | * | |
280 | * FUNCTION: acpi_ev_global_lock_handler | |
281 | * | |
282 | * PARAMETERS: Context - From thread interface, not used | |
283 | * | |
a72d4756 | 284 | * RETURN: ACPI_INTERRUPT_HANDLED |
1da177e4 LT |
285 | * |
286 | * DESCRIPTION: Invoked directly from the SCI handler when a global lock | |
9cd03144 RW |
287 | * release interrupt occurs. If there's a thread waiting for |
288 | * the global lock, signal it. | |
a72d4756 BM |
289 | * |
290 | * NOTE: Assumes that the semaphore can be signaled from interrupt level. If | |
291 | * this is not possible for some reason, a separate thread will have to be | |
292 | * scheduled to do this. | |
1da177e4 LT |
293 | * |
294 | ******************************************************************************/ | |
9cd03144 | 295 | static u8 acpi_ev_global_lock_pending; |
1da177e4 | 296 | |
4be44fcd | 297 | static u32 acpi_ev_global_lock_handler(void *context) |
1da177e4 | 298 | { |
9cd03144 RW |
299 | acpi_status status; |
300 | acpi_cpu_flags flags; | |
1da177e4 | 301 | |
9cd03144 | 302 | flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock); |
52fc0b02 | 303 | |
9cd03144 RW |
304 | if (!acpi_ev_global_lock_pending) { |
305 | goto out; | |
306 | } | |
c81da666 | 307 | |
9cd03144 | 308 | /* Send a unit to the semaphore */ |
a72d4756 | 309 | |
9cd03144 RW |
310 | status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1); |
311 | if (ACPI_FAILURE(status)) { | |
312 | ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore")); | |
1da177e4 LT |
313 | } |
314 | ||
9cd03144 RW |
315 | acpi_ev_global_lock_pending = FALSE; |
316 | ||
317 | out: | |
318 | acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags); | |
319 | ||
1da177e4 LT |
320 | return (ACPI_INTERRUPT_HANDLED); |
321 | } | |
322 | ||
1da177e4 LT |
323 | /******************************************************************************* |
324 | * | |
325 | * FUNCTION: acpi_ev_init_global_lock_handler | |
326 | * | |
327 | * PARAMETERS: None | |
328 | * | |
329 | * RETURN: Status | |
330 | * | |
331 | * DESCRIPTION: Install a handler for the global lock release event | |
332 | * | |
333 | ******************************************************************************/ | |
334 | ||
4be44fcd | 335 | acpi_status acpi_ev_init_global_lock_handler(void) |
1da177e4 | 336 | { |
4be44fcd | 337 | acpi_status status; |
1da177e4 | 338 | |
b229cf92 | 339 | ACPI_FUNCTION_TRACE(ev_init_global_lock_handler); |
1da177e4 | 340 | |
009c4cbe | 341 | /* Attempt installation of the global lock handler */ |
f3d2e786 | 342 | |
4be44fcd LB |
343 | status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL, |
344 | acpi_ev_global_lock_handler, | |
345 | NULL); | |
1da177e4 LT |
346 | |
347 | /* | |
9f15fc66 BM |
348 | * If the global lock does not exist on this platform, the attempt to |
349 | * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick). | |
350 | * Map to AE_OK, but mark global lock as not present. Any attempt to | |
351 | * actually use the global lock will be flagged with an error. | |
1da177e4 LT |
352 | */ |
353 | if (status == AE_NO_HARDWARE_RESPONSE) { | |
b8e4d893 BM |
354 | ACPI_ERROR((AE_INFO, |
355 | "No response from Global Lock hardware, disabling lock")); | |
0c9938cc | 356 | |
1da177e4 | 357 | acpi_gbl_global_lock_present = FALSE; |
009c4cbe | 358 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
359 | } |
360 | ||
009c4cbe | 361 | acpi_gbl_global_lock_present = TRUE; |
4be44fcd | 362 | return_ACPI_STATUS(status); |
1da177e4 LT |
363 | } |
364 | ||
8876016b BM |
365 | /******************************************************************************* |
366 | * | |
367 | * FUNCTION: acpi_ev_remove_global_lock_handler | |
368 | * | |
369 | * PARAMETERS: None | |
370 | * | |
371 | * RETURN: Status | |
372 | * | |
373 | * DESCRIPTION: Remove the handler for the Global Lock | |
374 | * | |
375 | ******************************************************************************/ | |
376 | ||
377 | static acpi_status acpi_ev_remove_global_lock_handler(void) | |
378 | { | |
379 | acpi_status status; | |
380 | ||
381 | ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler); | |
382 | ||
383 | acpi_gbl_global_lock_present = FALSE; | |
384 | status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL, | |
385 | acpi_ev_global_lock_handler); | |
386 | ||
387 | return_ACPI_STATUS(status); | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /****************************************************************************** |
391 | * | |
392 | * FUNCTION: acpi_ev_acquire_global_lock | |
393 | * | |
394 | * PARAMETERS: Timeout - Max time to wait for the lock, in millisec. | |
395 | * | |
396 | * RETURN: Status | |
397 | * | |
398 | * DESCRIPTION: Attempt to gain ownership of the Global Lock. | |
399 | * | |
c81da666 BM |
400 | * MUTEX: Interpreter must be locked |
401 | * | |
402 | * Note: The original implementation allowed multiple threads to "acquire" the | |
403 | * Global Lock, and the OS would hold the lock until the last thread had | |
404 | * released it. However, this could potentially starve the BIOS out of the | |
405 | * lock, especially in the case where there is a tight handshake between the | |
406 | * Embedded Controller driver and the BIOS. Therefore, this implementation | |
407 | * allows only one thread to acquire the HW Global Lock at a time, and makes | |
408 | * the global lock appear as a standard mutex on the OS side. | |
409 | * | |
1da177e4 | 410 | *****************************************************************************/ |
610a3d06 AS |
411 | static acpi_thread_id acpi_ev_global_lock_thread_id; |
412 | static int acpi_ev_global_lock_acquired; | |
1da177e4 | 413 | |
4be44fcd | 414 | acpi_status acpi_ev_acquire_global_lock(u16 timeout) |
1da177e4 | 415 | { |
9cd03144 | 416 | acpi_cpu_flags flags; |
4be44fcd LB |
417 | acpi_status status = AE_OK; |
418 | u8 acquired = FALSE; | |
1da177e4 | 419 | |
b229cf92 | 420 | ACPI_FUNCTION_TRACE(ev_acquire_global_lock); |
1da177e4 | 421 | |
c81da666 BM |
422 | /* |
423 | * Only one thread can acquire the GL at a time, the global_lock_mutex | |
424 | * enforces this. This interface releases the interpreter if we must wait. | |
425 | */ | |
ba886cd4 BM |
426 | status = acpi_ex_system_wait_mutex( |
427 | acpi_gbl_global_lock_mutex->mutex.os_mutex, 0); | |
610a3d06 AS |
428 | if (status == AE_TIME) { |
429 | if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) { | |
430 | acpi_ev_global_lock_acquired++; | |
431 | return AE_OK; | |
432 | } | |
433 | } | |
434 | ||
435 | if (ACPI_FAILURE(status)) { | |
ba886cd4 BM |
436 | status = acpi_ex_system_wait_mutex( |
437 | acpi_gbl_global_lock_mutex->mutex.os_mutex, | |
438 | timeout); | |
610a3d06 | 439 | } |
c81da666 BM |
440 | if (ACPI_FAILURE(status)) { |
441 | return_ACPI_STATUS(status); | |
1da177e4 | 442 | } |
1da177e4 | 443 | |
610a3d06 AS |
444 | acpi_ev_global_lock_thread_id = acpi_os_get_thread_id(); |
445 | acpi_ev_global_lock_acquired++; | |
446 | ||
44f6c012 | 447 | /* |
e5567afa BM |
448 | * Update the global lock handle and check for wraparound. The handle is |
449 | * only used for the external global lock interfaces, but it is updated | |
450 | * here to properly handle the case where a single thread may acquire the | |
451 | * lock via both the AML and the acpi_acquire_global_lock interfaces. The | |
452 | * handle is therefore updated on the first acquire from a given thread | |
453 | * regardless of where the acquisition request originated. | |
454 | */ | |
455 | acpi_gbl_global_lock_handle++; | |
456 | if (acpi_gbl_global_lock_handle == 0) { | |
457 | acpi_gbl_global_lock_handle = 1; | |
458 | } | |
459 | ||
460 | /* | |
9f15fc66 BM |
461 | * Make sure that a global lock actually exists. If not, just treat the |
462 | * lock as a standard mutex. | |
44f6c012 | 463 | */ |
c81da666 BM |
464 | if (!acpi_gbl_global_lock_present) { |
465 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 466 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
467 | } |
468 | ||
9cd03144 RW |
469 | flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock); |
470 | ||
471 | do { | |
472 | ||
473 | /* Attempt to acquire the actual hardware lock */ | |
1da177e4 | 474 | |
9cd03144 RW |
475 | ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired); |
476 | if (acquired) { | |
477 | acpi_gbl_global_lock_acquired = TRUE; | |
478 | ||
479 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
480 | "Acquired hardware Global Lock\n")); | |
481 | break; | |
482 | } | |
52fc0b02 | 483 | |
9cd03144 | 484 | acpi_ev_global_lock_pending = TRUE; |
1da177e4 | 485 | |
9cd03144 RW |
486 | acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags); |
487 | ||
488 | /* | |
489 | * Did not get the lock. The pending bit was set above, and we | |
490 | * must wait until we get the global lock released interrupt. | |
491 | */ | |
4be44fcd | 492 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
9cd03144 | 493 | "Waiting for hardware Global Lock\n")); |
1da177e4 | 494 | |
9cd03144 RW |
495 | /* |
496 | * Wait for handshake with the global lock interrupt handler. | |
497 | * This interface releases the interpreter if we must wait. | |
498 | */ | |
499 | status = acpi_ex_system_wait_semaphore( | |
500 | acpi_gbl_global_lock_semaphore, | |
501 | ACPI_WAIT_FOREVER); | |
1da177e4 | 502 | |
9cd03144 | 503 | flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock); |
1da177e4 | 504 | |
9cd03144 RW |
505 | } while (ACPI_SUCCESS(status)); |
506 | ||
507 | acpi_ev_global_lock_pending = FALSE; | |
508 | ||
509 | acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags); | |
f3d2e786 | 510 | |
4be44fcd | 511 | return_ACPI_STATUS(status); |
1da177e4 LT |
512 | } |
513 | ||
1da177e4 LT |
514 | /******************************************************************************* |
515 | * | |
516 | * FUNCTION: acpi_ev_release_global_lock | |
517 | * | |
518 | * PARAMETERS: None | |
519 | * | |
520 | * RETURN: Status | |
521 | * | |
522 | * DESCRIPTION: Releases ownership of the Global Lock. | |
523 | * | |
524 | ******************************************************************************/ | |
525 | ||
4be44fcd | 526 | acpi_status acpi_ev_release_global_lock(void) |
1da177e4 | 527 | { |
4be44fcd LB |
528 | u8 pending = FALSE; |
529 | acpi_status status = AE_OK; | |
1da177e4 | 530 | |
b229cf92 | 531 | ACPI_FUNCTION_TRACE(ev_release_global_lock); |
1da177e4 | 532 | |
a72d4756 | 533 | /* Lock must be already acquired */ |
c81da666 BM |
534 | |
535 | if (!acpi_gbl_global_lock_acquired) { | |
b8e4d893 | 536 | ACPI_WARNING((AE_INFO, |
c81da666 | 537 | "Cannot release the ACPI Global Lock, it has not been acquired")); |
4be44fcd | 538 | return_ACPI_STATUS(AE_NOT_ACQUIRED); |
1da177e4 LT |
539 | } |
540 | ||
610a3d06 AS |
541 | acpi_ev_global_lock_acquired--; |
542 | if (acpi_ev_global_lock_acquired > 0) { | |
543 | return AE_OK; | |
544 | } | |
545 | ||
c81da666 | 546 | if (acpi_gbl_global_lock_present) { |
1da177e4 | 547 | |
c81da666 | 548 | /* Allow any thread to release the lock */ |
52fc0b02 | 549 | |
009c4cbe | 550 | ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending); |
1da177e4 | 551 | |
c81da666 BM |
552 | /* |
553 | * If the pending bit was set, we must write GBL_RLS to the control | |
554 | * register | |
555 | */ | |
556 | if (pending) { | |
557 | status = | |
50ffba1b | 558 | acpi_write_bit_register |
768aaaf1 BM |
559 | (ACPI_BITREG_GLOBAL_LOCK_RELEASE, |
560 | ACPI_ENABLE_EVENT); | |
c81da666 BM |
561 | } |
562 | ||
563 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
564 | "Released hardware Global Lock\n")); | |
1da177e4 LT |
565 | } |
566 | ||
1da177e4 LT |
567 | acpi_gbl_global_lock_acquired = FALSE; |
568 | ||
c81da666 | 569 | /* Release the local GL mutex */ |
28eb3fcf | 570 | acpi_ev_global_lock_thread_id = 0; |
610a3d06 | 571 | acpi_ev_global_lock_acquired = 0; |
ba886cd4 | 572 | acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex); |
4be44fcd | 573 | return_ACPI_STATUS(status); |
1da177e4 LT |
574 | } |
575 | ||
1da177e4 LT |
576 | /****************************************************************************** |
577 | * | |
578 | * FUNCTION: acpi_ev_terminate | |
579 | * | |
580 | * PARAMETERS: none | |
581 | * | |
582 | * RETURN: none | |
583 | * | |
584 | * DESCRIPTION: Disable events and free memory allocated for table storage. | |
585 | * | |
586 | ******************************************************************************/ | |
587 | ||
4be44fcd | 588 | void acpi_ev_terminate(void) |
1da177e4 | 589 | { |
67a119f9 | 590 | u32 i; |
4be44fcd | 591 | acpi_status status; |
1da177e4 | 592 | |
b229cf92 | 593 | ACPI_FUNCTION_TRACE(ev_terminate); |
1da177e4 LT |
594 | |
595 | if (acpi_gbl_events_initialized) { | |
596 | /* | |
9f15fc66 BM |
597 | * Disable all event-related functionality. In all cases, on error, |
598 | * print a message but obviously we don't abort. | |
1da177e4 LT |
599 | */ |
600 | ||
601 | /* Disable all fixed events */ | |
602 | ||
603 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
67a119f9 | 604 | status = acpi_disable_event(i, 0); |
4be44fcd | 605 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 606 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 607 | "Could not disable fixed event %u", |
b8e4d893 | 608 | (u32) i)); |
1da177e4 LT |
609 | } |
610 | } | |
611 | ||
612 | /* Disable all GPEs in all GPE blocks */ | |
613 | ||
e97d6bf1 | 614 | status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL); |
1da177e4 LT |
615 | |
616 | /* Remove SCI handler */ | |
617 | ||
4be44fcd | 618 | status = acpi_ev_remove_sci_handler(); |
1da177e4 | 619 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 620 | ACPI_ERROR((AE_INFO, "Could not remove SCI handler")); |
1da177e4 | 621 | } |
8876016b BM |
622 | |
623 | status = acpi_ev_remove_global_lock_handler(); | |
624 | if (ACPI_FAILURE(status)) { | |
625 | ACPI_ERROR((AE_INFO, | |
626 | "Could not remove Global Lock handler")); | |
627 | } | |
1da177e4 LT |
628 | } |
629 | ||
630 | /* Deallocate all handler objects installed within GPE info structs */ | |
631 | ||
e97d6bf1 | 632 | status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL); |
1da177e4 LT |
633 | |
634 | /* Return to original mode if necessary */ | |
635 | ||
636 | if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) { | |
4be44fcd LB |
637 | status = acpi_disable(); |
638 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 639 | ACPI_WARNING((AE_INFO, "AcpiDisable failed")); |
1da177e4 LT |
640 | } |
641 | } | |
642 | return_VOID; | |
643 | } |