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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evmisc - Miscellaneous event manager support functions | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, 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> | |
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 | |
f3d2e786 | 52 | /* Pointer to FACS needed for the Global Lock */ |
f3d2e786 BM |
53 | static struct acpi_table_facs *facs = NULL; |
54 | ||
44f6c012 RM |
55 | /* Local prototypes */ |
56 | ||
4be44fcd | 57 | static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context); |
44f6c012 | 58 | |
4be44fcd | 59 | static u32 acpi_ev_global_lock_handler(void *context); |
44f6c012 | 60 | |
8876016b BM |
61 | static acpi_status acpi_ev_remove_global_lock_handler(void); |
62 | ||
1da177e4 LT |
63 | /******************************************************************************* |
64 | * | |
65 | * FUNCTION: acpi_ev_is_notify_object | |
66 | * | |
67 | * PARAMETERS: Node - Node to check | |
68 | * | |
69 | * RETURN: TRUE if notifies allowed on this object | |
70 | * | |
71 | * DESCRIPTION: Check type of node for a object that supports notifies. | |
72 | * | |
73 | * TBD: This could be replaced by a flag bit in the node. | |
74 | * | |
75 | ******************************************************************************/ | |
76 | ||
4be44fcd | 77 | u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node) |
1da177e4 LT |
78 | { |
79 | switch (node->type) { | |
80 | case ACPI_TYPE_DEVICE: | |
81 | case ACPI_TYPE_PROCESSOR: | |
1da177e4 LT |
82 | case ACPI_TYPE_THERMAL: |
83 | /* | |
84 | * These are the ONLY objects that can receive ACPI notifications | |
85 | */ | |
86 | return (TRUE); | |
87 | ||
88 | default: | |
89 | return (FALSE); | |
90 | } | |
91 | } | |
92 | ||
1da177e4 LT |
93 | /******************************************************************************* |
94 | * | |
95 | * FUNCTION: acpi_ev_queue_notify_request | |
96 | * | |
97 | * PARAMETERS: Node - NS node for the notified object | |
98 | * notify_value - Value from the Notify() request | |
99 | * | |
100 | * RETURN: Status | |
101 | * | |
102 | * DESCRIPTION: Dispatch a device notification event to a previously | |
103 | * installed handler. | |
104 | * | |
105 | ******************************************************************************/ | |
106 | ||
1da177e4 | 107 | acpi_status |
4be44fcd LB |
108 | acpi_ev_queue_notify_request(struct acpi_namespace_node * node, |
109 | u32 notify_value) | |
1da177e4 | 110 | { |
4be44fcd LB |
111 | union acpi_operand_object *obj_desc; |
112 | union acpi_operand_object *handler_obj = NULL; | |
113 | union acpi_generic_state *notify_info; | |
114 | acpi_status status = AE_OK; | |
1da177e4 | 115 | |
b229cf92 | 116 | ACPI_FUNCTION_NAME(ev_queue_notify_request); |
1da177e4 LT |
117 | |
118 | /* | |
119 | * For value 3 (Ejection Request), some device method may need to be run. | |
44f6c012 RM |
120 | * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need |
121 | * to be run. | |
1da177e4 | 122 | * For value 0x80 (Status Change) on the power button or sleep button, |
44f6c012 | 123 | * initiate soft-off or sleep operation? |
1da177e4 | 124 | */ |
4be44fcd | 125 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
514d18d7 ZR |
126 | "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n", |
127 | acpi_ut_get_node_name(node), node, notify_value, | |
128 | acpi_ut_get_notify_name(notify_value))); | |
1da177e4 LT |
129 | |
130 | /* Get the notify object attached to the NS Node */ | |
131 | ||
4be44fcd | 132 | obj_desc = acpi_ns_get_attached_object(node); |
1da177e4 | 133 | if (obj_desc) { |
52fc0b02 | 134 | |
1da177e4 LT |
135 | /* We have the notify object, Get the right handler */ |
136 | ||
137 | switch (node->type) { | |
514d18d7 ZR |
138 | |
139 | /* Notify allowed only on these types */ | |
140 | ||
1da177e4 LT |
141 | case ACPI_TYPE_DEVICE: |
142 | case ACPI_TYPE_THERMAL: | |
143 | case ACPI_TYPE_PROCESSOR: | |
1da177e4 LT |
144 | |
145 | if (notify_value <= ACPI_MAX_SYS_NOTIFY) { | |
4be44fcd LB |
146 | handler_obj = |
147 | obj_desc->common_notify.system_notify; | |
148 | } else { | |
149 | handler_obj = | |
150 | obj_desc->common_notify.device_notify; | |
1da177e4 LT |
151 | } |
152 | break; | |
153 | ||
154 | default: | |
155 | /* All other types are not supported */ | |
156 | return (AE_TYPE); | |
157 | } | |
158 | } | |
159 | ||
514d18d7 ZR |
160 | /* |
161 | * If there is any handler to run, schedule the dispatcher. | |
162 | * Check for: | |
163 | * 1) Global system notify handler | |
164 | * 2) Global device notify handler | |
165 | * 3) Per-device notify handler | |
166 | */ | |
4be44fcd LB |
167 | if ((acpi_gbl_system_notify.handler |
168 | && (notify_value <= ACPI_MAX_SYS_NOTIFY)) | |
169 | || (acpi_gbl_device_notify.handler | |
170 | && (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) { | |
171 | notify_info = acpi_ut_create_generic_state(); | |
1da177e4 LT |
172 | if (!notify_info) { |
173 | return (AE_NO_MEMORY); | |
174 | } | |
175 | ||
514d18d7 ZR |
176 | if (!handler_obj) { |
177 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
178 | "Executing system notify handler for Notify (%4.4s, %X) node %p\n", | |
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 { |
1da177e4 | 196 | /* |
514d18d7 | 197 | * There is no notify handler (per-device or system) for this device. |
1da177e4 | 198 | */ |
4be44fcd | 199 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
514d18d7 | 200 | "No notify handler for Notify (%4.4s, %X) node %p\n", |
4be44fcd LB |
201 | acpi_ut_get_node_name(node), notify_value, |
202 | node)); | |
1da177e4 LT |
203 | } |
204 | ||
205 | return (status); | |
206 | } | |
207 | ||
1da177e4 LT |
208 | /******************************************************************************* |
209 | * | |
210 | * FUNCTION: acpi_ev_notify_dispatch | |
211 | * | |
44f6c012 | 212 | * PARAMETERS: Context - To be passed to the notify handler |
1da177e4 LT |
213 | * |
214 | * RETURN: None. | |
215 | * | |
216 | * DESCRIPTION: Dispatch a device notification event to a previously | |
217 | * installed handler. | |
218 | * | |
219 | ******************************************************************************/ | |
220 | ||
4be44fcd | 221 | static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context) |
1da177e4 | 222 | { |
4be44fcd LB |
223 | union acpi_generic_state *notify_info = |
224 | (union acpi_generic_state *)context; | |
225 | acpi_notify_handler global_handler = NULL; | |
226 | void *global_context = NULL; | |
227 | union acpi_operand_object *handler_obj; | |
1da177e4 | 228 | |
4be44fcd | 229 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
230 | |
231 | /* | |
232 | * We will invoke a global notify handler if installed. | |
44f6c012 RM |
233 | * This is done _before_ we invoke the per-device handler attached |
234 | * to the device. | |
1da177e4 LT |
235 | */ |
236 | if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) { | |
52fc0b02 | 237 | |
1da177e4 LT |
238 | /* Global system notification handler */ |
239 | ||
240 | if (acpi_gbl_system_notify.handler) { | |
241 | global_handler = acpi_gbl_system_notify.handler; | |
242 | global_context = acpi_gbl_system_notify.context; | |
243 | } | |
4be44fcd | 244 | } else { |
1da177e4 LT |
245 | /* Global driver notification handler */ |
246 | ||
247 | if (acpi_gbl_device_notify.handler) { | |
248 | global_handler = acpi_gbl_device_notify.handler; | |
249 | global_context = acpi_gbl_device_notify.context; | |
250 | } | |
251 | } | |
252 | ||
253 | /* Invoke the system handler first, if present */ | |
254 | ||
255 | if (global_handler) { | |
4be44fcd LB |
256 | global_handler(notify_info->notify.node, |
257 | notify_info->notify.value, global_context); | |
1da177e4 LT |
258 | } |
259 | ||
260 | /* Now invoke the per-device handler, if present */ | |
261 | ||
262 | handler_obj = notify_info->notify.handler_obj; | |
263 | if (handler_obj) { | |
4be44fcd LB |
264 | handler_obj->notify.handler(notify_info->notify.node, |
265 | notify_info->notify.value, | |
266 | handler_obj->notify.context); | |
1da177e4 LT |
267 | } |
268 | ||
269 | /* All done with the info object */ | |
270 | ||
4be44fcd | 271 | acpi_ut_delete_generic_state(notify_info); |
1da177e4 LT |
272 | } |
273 | ||
1da177e4 LT |
274 | /******************************************************************************* |
275 | * | |
276 | * FUNCTION: acpi_ev_global_lock_handler | |
277 | * | |
278 | * PARAMETERS: Context - From thread interface, not used | |
279 | * | |
a72d4756 | 280 | * RETURN: ACPI_INTERRUPT_HANDLED |
1da177e4 LT |
281 | * |
282 | * DESCRIPTION: Invoked directly from the SCI handler when a global lock | |
a72d4756 BM |
283 | * release interrupt occurs. Attempt to acquire the global lock, |
284 | * if successful, signal the thread waiting for the lock. | |
285 | * | |
286 | * NOTE: Assumes that the semaphore can be signaled from interrupt level. If | |
287 | * this is not possible for some reason, a separate thread will have to be | |
288 | * scheduled to do this. | |
1da177e4 LT |
289 | * |
290 | ******************************************************************************/ | |
291 | ||
4be44fcd | 292 | static u32 acpi_ev_global_lock_handler(void *context) |
1da177e4 | 293 | { |
4be44fcd | 294 | u8 acquired = FALSE; |
1da177e4 LT |
295 | |
296 | /* | |
c81da666 BM |
297 | * Attempt to get the lock. |
298 | * | |
1da177e4 LT |
299 | * If we don't get it now, it will be marked pending and we will |
300 | * take another interrupt when it becomes free. | |
301 | */ | |
f3d2e786 | 302 | ACPI_ACQUIRE_GLOBAL_LOCK(facs, acquired); |
1da177e4 | 303 | if (acquired) { |
52fc0b02 | 304 | |
1da177e4 | 305 | /* Got the lock, now wake all threads waiting for it */ |
c81da666 | 306 | |
1da177e4 | 307 | acpi_gbl_global_lock_acquired = TRUE; |
a72d4756 BM |
308 | /* Send a unit to the semaphore */ |
309 | ||
fd350943 LB |
310 | if (ACPI_FAILURE |
311 | (acpi_os_signal_semaphore | |
312 | (acpi_gbl_global_lock_semaphore, 1))) { | |
a72d4756 BM |
313 | ACPI_ERROR((AE_INFO, |
314 | "Could not signal Global Lock semaphore")); | |
315 | } | |
1da177e4 LT |
316 | } |
317 | ||
318 | return (ACPI_INTERRUPT_HANDLED); | |
319 | } | |
320 | ||
1da177e4 LT |
321 | /******************************************************************************* |
322 | * | |
323 | * FUNCTION: acpi_ev_init_global_lock_handler | |
324 | * | |
325 | * PARAMETERS: None | |
326 | * | |
327 | * RETURN: Status | |
328 | * | |
329 | * DESCRIPTION: Install a handler for the global lock release event | |
330 | * | |
331 | ******************************************************************************/ | |
332 | ||
4be44fcd | 333 | acpi_status acpi_ev_init_global_lock_handler(void) |
1da177e4 | 334 | { |
4be44fcd | 335 | acpi_status status; |
1da177e4 | 336 | |
b229cf92 | 337 | ACPI_FUNCTION_TRACE(ev_init_global_lock_handler); |
1da177e4 | 338 | |
1d18c058 BM |
339 | status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, |
340 | ACPI_CAST_INDIRECT_PTR(struct | |
341 | acpi_table_header, | |
342 | &facs)); | |
f3d2e786 BM |
343 | if (ACPI_FAILURE(status)) { |
344 | return_ACPI_STATUS(status); | |
345 | } | |
346 | ||
1da177e4 | 347 | acpi_gbl_global_lock_present = TRUE; |
4be44fcd LB |
348 | status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL, |
349 | acpi_ev_global_lock_handler, | |
350 | NULL); | |
1da177e4 LT |
351 | |
352 | /* | |
353 | * If the global lock does not exist on this platform, the attempt | |
354 | * to enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick) | |
355 | * Map to AE_OK, but mark global lock as not present. | |
356 | * Any attempt to actually use the global lock will be flagged | |
357 | * with an error. | |
358 | */ | |
359 | if (status == AE_NO_HARDWARE_RESPONSE) { | |
b8e4d893 BM |
360 | ACPI_ERROR((AE_INFO, |
361 | "No response from Global Lock hardware, disabling lock")); | |
0c9938cc | 362 | |
1da177e4 LT |
363 | acpi_gbl_global_lock_present = FALSE; |
364 | status = AE_OK; | |
365 | } | |
366 | ||
4be44fcd | 367 | return_ACPI_STATUS(status); |
1da177e4 LT |
368 | } |
369 | ||
8876016b BM |
370 | /******************************************************************************* |
371 | * | |
372 | * FUNCTION: acpi_ev_remove_global_lock_handler | |
373 | * | |
374 | * PARAMETERS: None | |
375 | * | |
376 | * RETURN: Status | |
377 | * | |
378 | * DESCRIPTION: Remove the handler for the Global Lock | |
379 | * | |
380 | ******************************************************************************/ | |
381 | ||
382 | static acpi_status acpi_ev_remove_global_lock_handler(void) | |
383 | { | |
384 | acpi_status status; | |
385 | ||
386 | ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler); | |
387 | ||
388 | acpi_gbl_global_lock_present = FALSE; | |
389 | status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL, | |
390 | acpi_ev_global_lock_handler); | |
391 | ||
392 | return_ACPI_STATUS(status); | |
393 | } | |
394 | ||
1da177e4 LT |
395 | /****************************************************************************** |
396 | * | |
397 | * FUNCTION: acpi_ev_acquire_global_lock | |
398 | * | |
399 | * PARAMETERS: Timeout - Max time to wait for the lock, in millisec. | |
400 | * | |
401 | * RETURN: Status | |
402 | * | |
403 | * DESCRIPTION: Attempt to gain ownership of the Global Lock. | |
404 | * | |
c81da666 BM |
405 | * MUTEX: Interpreter must be locked |
406 | * | |
407 | * Note: The original implementation allowed multiple threads to "acquire" the | |
408 | * Global Lock, and the OS would hold the lock until the last thread had | |
409 | * released it. However, this could potentially starve the BIOS out of the | |
410 | * lock, especially in the case where there is a tight handshake between the | |
411 | * Embedded Controller driver and the BIOS. Therefore, this implementation | |
412 | * allows only one thread to acquire the HW Global Lock at a time, and makes | |
413 | * the global lock appear as a standard mutex on the OS side. | |
414 | * | |
1da177e4 | 415 | *****************************************************************************/ |
610a3d06 AS |
416 | static acpi_thread_id acpi_ev_global_lock_thread_id; |
417 | static int acpi_ev_global_lock_acquired; | |
1da177e4 | 418 | |
4be44fcd | 419 | acpi_status acpi_ev_acquire_global_lock(u16 timeout) |
1da177e4 | 420 | { |
4be44fcd LB |
421 | acpi_status status = AE_OK; |
422 | u8 acquired = FALSE; | |
1da177e4 | 423 | |
b229cf92 | 424 | ACPI_FUNCTION_TRACE(ev_acquire_global_lock); |
1da177e4 | 425 | |
c81da666 BM |
426 | /* |
427 | * Only one thread can acquire the GL at a time, the global_lock_mutex | |
428 | * enforces this. This interface releases the interpreter if we must wait. | |
429 | */ | |
ba886cd4 BM |
430 | status = acpi_ex_system_wait_mutex( |
431 | acpi_gbl_global_lock_mutex->mutex.os_mutex, 0); | |
610a3d06 AS |
432 | if (status == AE_TIME) { |
433 | if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) { | |
434 | acpi_ev_global_lock_acquired++; | |
435 | return AE_OK; | |
436 | } | |
437 | } | |
438 | ||
439 | if (ACPI_FAILURE(status)) { | |
ba886cd4 BM |
440 | status = acpi_ex_system_wait_mutex( |
441 | acpi_gbl_global_lock_mutex->mutex.os_mutex, | |
442 | timeout); | |
610a3d06 | 443 | } |
c81da666 BM |
444 | if (ACPI_FAILURE(status)) { |
445 | return_ACPI_STATUS(status); | |
1da177e4 | 446 | } |
1da177e4 | 447 | |
610a3d06 AS |
448 | acpi_ev_global_lock_thread_id = acpi_os_get_thread_id(); |
449 | acpi_ev_global_lock_acquired++; | |
450 | ||
44f6c012 | 451 | /* |
e5567afa BM |
452 | * Update the global lock handle and check for wraparound. The handle is |
453 | * only used for the external global lock interfaces, but it is updated | |
454 | * here to properly handle the case where a single thread may acquire the | |
455 | * lock via both the AML and the acpi_acquire_global_lock interfaces. The | |
456 | * handle is therefore updated on the first acquire from a given thread | |
457 | * regardless of where the acquisition request originated. | |
458 | */ | |
459 | acpi_gbl_global_lock_handle++; | |
460 | if (acpi_gbl_global_lock_handle == 0) { | |
461 | acpi_gbl_global_lock_handle = 1; | |
462 | } | |
463 | ||
464 | /* | |
c81da666 BM |
465 | * Make sure that a global lock actually exists. If not, just treat |
466 | * the lock as a standard mutex. | |
44f6c012 | 467 | */ |
c81da666 BM |
468 | if (!acpi_gbl_global_lock_present) { |
469 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 470 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
471 | } |
472 | ||
c81da666 | 473 | /* Attempt to acquire the actual hardware lock */ |
1da177e4 | 474 | |
f3d2e786 | 475 | ACPI_ACQUIRE_GLOBAL_LOCK(facs, acquired); |
1da177e4 | 476 | if (acquired) { |
52fc0b02 | 477 | |
4be44fcd | 478 | /* We got the lock */ |
1da177e4 | 479 | |
4be44fcd | 480 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
c81da666 | 481 | "Acquired hardware Global Lock\n")); |
1da177e4 LT |
482 | |
483 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 484 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
485 | } |
486 | ||
487 | /* | |
c81da666 | 488 | * Did not get the lock. The pending bit was set above, and we must now |
1da177e4 LT |
489 | * wait until we get the global lock released interrupt. |
490 | */ | |
c81da666 | 491 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n")); |
1da177e4 LT |
492 | |
493 | /* | |
c81da666 BM |
494 | * Wait for handshake with the global lock interrupt handler. |
495 | * This interface releases the interpreter if we must wait. | |
1da177e4 | 496 | */ |
c81da666 BM |
497 | status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore, |
498 | ACPI_WAIT_FOREVER); | |
f3d2e786 | 499 | |
4be44fcd | 500 | return_ACPI_STATUS(status); |
1da177e4 LT |
501 | } |
502 | ||
1da177e4 LT |
503 | /******************************************************************************* |
504 | * | |
505 | * FUNCTION: acpi_ev_release_global_lock | |
506 | * | |
507 | * PARAMETERS: None | |
508 | * | |
509 | * RETURN: Status | |
510 | * | |
511 | * DESCRIPTION: Releases ownership of the Global Lock. | |
512 | * | |
513 | ******************************************************************************/ | |
514 | ||
4be44fcd | 515 | acpi_status acpi_ev_release_global_lock(void) |
1da177e4 | 516 | { |
4be44fcd LB |
517 | u8 pending = FALSE; |
518 | acpi_status status = AE_OK; | |
1da177e4 | 519 | |
b229cf92 | 520 | ACPI_FUNCTION_TRACE(ev_release_global_lock); |
1da177e4 | 521 | |
a72d4756 | 522 | /* Lock must be already acquired */ |
c81da666 BM |
523 | |
524 | if (!acpi_gbl_global_lock_acquired) { | |
b8e4d893 | 525 | ACPI_WARNING((AE_INFO, |
c81da666 | 526 | "Cannot release the ACPI Global Lock, it has not been acquired")); |
4be44fcd | 527 | return_ACPI_STATUS(AE_NOT_ACQUIRED); |
1da177e4 LT |
528 | } |
529 | ||
610a3d06 AS |
530 | acpi_ev_global_lock_acquired--; |
531 | if (acpi_ev_global_lock_acquired > 0) { | |
532 | return AE_OK; | |
533 | } | |
534 | ||
c81da666 | 535 | if (acpi_gbl_global_lock_present) { |
1da177e4 | 536 | |
c81da666 | 537 | /* Allow any thread to release the lock */ |
52fc0b02 | 538 | |
f3d2e786 | 539 | ACPI_RELEASE_GLOBAL_LOCK(facs, pending); |
1da177e4 | 540 | |
c81da666 BM |
541 | /* |
542 | * If the pending bit was set, we must write GBL_RLS to the control | |
543 | * register | |
544 | */ | |
545 | if (pending) { | |
546 | status = | |
547 | acpi_set_register(ACPI_BITREG_GLOBAL_LOCK_RELEASE, | |
d8c71b6d | 548 | 1); |
c81da666 BM |
549 | } |
550 | ||
551 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
552 | "Released hardware Global Lock\n")); | |
1da177e4 LT |
553 | } |
554 | ||
1da177e4 LT |
555 | acpi_gbl_global_lock_acquired = FALSE; |
556 | ||
c81da666 | 557 | /* Release the local GL mutex */ |
89952d13 | 558 | acpi_ev_global_lock_thread_id = NULL; |
610a3d06 | 559 | acpi_ev_global_lock_acquired = 0; |
ba886cd4 | 560 | acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex); |
4be44fcd | 561 | return_ACPI_STATUS(status); |
1da177e4 LT |
562 | } |
563 | ||
1da177e4 LT |
564 | /****************************************************************************** |
565 | * | |
566 | * FUNCTION: acpi_ev_terminate | |
567 | * | |
568 | * PARAMETERS: none | |
569 | * | |
570 | * RETURN: none | |
571 | * | |
572 | * DESCRIPTION: Disable events and free memory allocated for table storage. | |
573 | * | |
574 | ******************************************************************************/ | |
575 | ||
4be44fcd | 576 | void acpi_ev_terminate(void) |
1da177e4 | 577 | { |
4be44fcd LB |
578 | acpi_native_uint i; |
579 | acpi_status status; | |
1da177e4 | 580 | |
b229cf92 | 581 | ACPI_FUNCTION_TRACE(ev_terminate); |
1da177e4 LT |
582 | |
583 | if (acpi_gbl_events_initialized) { | |
584 | /* | |
585 | * Disable all event-related functionality. | |
586 | * In all cases, on error, print a message but obviously we don't abort. | |
587 | */ | |
588 | ||
589 | /* Disable all fixed events */ | |
590 | ||
591 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
4be44fcd LB |
592 | status = acpi_disable_event((u32) i, 0); |
593 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
594 | ACPI_ERROR((AE_INFO, |
595 | "Could not disable fixed event %d", | |
596 | (u32) i)); | |
1da177e4 LT |
597 | } |
598 | } | |
599 | ||
600 | /* Disable all GPEs in all GPE blocks */ | |
601 | ||
4be44fcd | 602 | status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block); |
1da177e4 LT |
603 | |
604 | /* Remove SCI handler */ | |
605 | ||
4be44fcd | 606 | status = acpi_ev_remove_sci_handler(); |
1da177e4 | 607 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 608 | ACPI_ERROR((AE_INFO, "Could not remove SCI handler")); |
1da177e4 | 609 | } |
8876016b BM |
610 | |
611 | status = acpi_ev_remove_global_lock_handler(); | |
612 | if (ACPI_FAILURE(status)) { | |
613 | ACPI_ERROR((AE_INFO, | |
614 | "Could not remove Global Lock handler")); | |
615 | } | |
1da177e4 LT |
616 | } |
617 | ||
618 | /* Deallocate all handler objects installed within GPE info structs */ | |
619 | ||
4be44fcd | 620 | status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers); |
1da177e4 LT |
621 | |
622 | /* Return to original mode if necessary */ | |
623 | ||
624 | if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) { | |
4be44fcd LB |
625 | status = acpi_disable(); |
626 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 627 | ACPI_WARNING((AE_INFO, "AcpiDisable failed")); |
1da177e4 LT |
628 | } |
629 | } | |
630 | return_VOID; | |
631 | } |