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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> | |
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) { | |
4be44fcd LB |
262 | handler_obj->notify.handler(notify_info->notify.node, |
263 | notify_info->notify.value, | |
264 | handler_obj->notify.context); | |
1da177e4 LT |
265 | } |
266 | ||
267 | /* All done with the info object */ | |
268 | ||
4be44fcd | 269 | acpi_ut_delete_generic_state(notify_info); |
1da177e4 LT |
270 | } |
271 | ||
1da177e4 LT |
272 | /******************************************************************************* |
273 | * | |
274 | * FUNCTION: acpi_ev_global_lock_handler | |
275 | * | |
276 | * PARAMETERS: Context - From thread interface, not used | |
277 | * | |
a72d4756 | 278 | * RETURN: ACPI_INTERRUPT_HANDLED |
1da177e4 LT |
279 | * |
280 | * DESCRIPTION: Invoked directly from the SCI handler when a global lock | |
a72d4756 BM |
281 | * release interrupt occurs. Attempt to acquire the global lock, |
282 | * if successful, signal the thread waiting for the lock. | |
283 | * | |
284 | * NOTE: Assumes that the semaphore can be signaled from interrupt level. If | |
285 | * this is not possible for some reason, a separate thread will have to be | |
286 | * scheduled to do this. | |
1da177e4 LT |
287 | * |
288 | ******************************************************************************/ | |
289 | ||
4be44fcd | 290 | static u32 acpi_ev_global_lock_handler(void *context) |
1da177e4 | 291 | { |
4be44fcd | 292 | u8 acquired = FALSE; |
1da177e4 LT |
293 | |
294 | /* | |
c81da666 BM |
295 | * Attempt to get the lock. |
296 | * | |
1da177e4 LT |
297 | * If we don't get it now, it will be marked pending and we will |
298 | * take another interrupt when it becomes free. | |
299 | */ | |
009c4cbe | 300 | ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired); |
1da177e4 | 301 | if (acquired) { |
52fc0b02 | 302 | |
1da177e4 | 303 | /* Got the lock, now wake all threads waiting for it */ |
c81da666 | 304 | |
1da177e4 | 305 | acpi_gbl_global_lock_acquired = TRUE; |
a72d4756 BM |
306 | /* Send a unit to the semaphore */ |
307 | ||
fd350943 LB |
308 | if (ACPI_FAILURE |
309 | (acpi_os_signal_semaphore | |
310 | (acpi_gbl_global_lock_semaphore, 1))) { | |
a72d4756 BM |
311 | ACPI_ERROR((AE_INFO, |
312 | "Could not signal Global Lock semaphore")); | |
313 | } | |
1da177e4 LT |
314 | } |
315 | ||
316 | return (ACPI_INTERRUPT_HANDLED); | |
317 | } | |
318 | ||
1da177e4 LT |
319 | /******************************************************************************* |
320 | * | |
321 | * FUNCTION: acpi_ev_init_global_lock_handler | |
322 | * | |
323 | * PARAMETERS: None | |
324 | * | |
325 | * RETURN: Status | |
326 | * | |
327 | * DESCRIPTION: Install a handler for the global lock release event | |
328 | * | |
329 | ******************************************************************************/ | |
330 | ||
4be44fcd | 331 | acpi_status acpi_ev_init_global_lock_handler(void) |
1da177e4 | 332 | { |
4be44fcd | 333 | acpi_status status; |
1da177e4 | 334 | |
b229cf92 | 335 | ACPI_FUNCTION_TRACE(ev_init_global_lock_handler); |
1da177e4 | 336 | |
009c4cbe | 337 | /* Attempt installation of the global lock handler */ |
f3d2e786 | 338 | |
4be44fcd LB |
339 | status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL, |
340 | acpi_ev_global_lock_handler, | |
341 | NULL); | |
1da177e4 LT |
342 | |
343 | /* | |
9f15fc66 BM |
344 | * If the global lock does not exist on this platform, the attempt to |
345 | * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick). | |
346 | * Map to AE_OK, but mark global lock as not present. Any attempt to | |
347 | * actually use the global lock will be flagged with an error. | |
1da177e4 LT |
348 | */ |
349 | if (status == AE_NO_HARDWARE_RESPONSE) { | |
b8e4d893 BM |
350 | ACPI_ERROR((AE_INFO, |
351 | "No response from Global Lock hardware, disabling lock")); | |
0c9938cc | 352 | |
1da177e4 | 353 | acpi_gbl_global_lock_present = FALSE; |
009c4cbe | 354 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
355 | } |
356 | ||
009c4cbe | 357 | acpi_gbl_global_lock_present = TRUE; |
4be44fcd | 358 | return_ACPI_STATUS(status); |
1da177e4 LT |
359 | } |
360 | ||
8876016b BM |
361 | /******************************************************************************* |
362 | * | |
363 | * FUNCTION: acpi_ev_remove_global_lock_handler | |
364 | * | |
365 | * PARAMETERS: None | |
366 | * | |
367 | * RETURN: Status | |
368 | * | |
369 | * DESCRIPTION: Remove the handler for the Global Lock | |
370 | * | |
371 | ******************************************************************************/ | |
372 | ||
373 | static acpi_status acpi_ev_remove_global_lock_handler(void) | |
374 | { | |
375 | acpi_status status; | |
376 | ||
377 | ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler); | |
378 | ||
379 | acpi_gbl_global_lock_present = FALSE; | |
380 | status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL, | |
381 | acpi_ev_global_lock_handler); | |
382 | ||
383 | return_ACPI_STATUS(status); | |
384 | } | |
385 | ||
1da177e4 LT |
386 | /****************************************************************************** |
387 | * | |
388 | * FUNCTION: acpi_ev_acquire_global_lock | |
389 | * | |
390 | * PARAMETERS: Timeout - Max time to wait for the lock, in millisec. | |
391 | * | |
392 | * RETURN: Status | |
393 | * | |
394 | * DESCRIPTION: Attempt to gain ownership of the Global Lock. | |
395 | * | |
c81da666 BM |
396 | * MUTEX: Interpreter must be locked |
397 | * | |
398 | * Note: The original implementation allowed multiple threads to "acquire" the | |
399 | * Global Lock, and the OS would hold the lock until the last thread had | |
400 | * released it. However, this could potentially starve the BIOS out of the | |
401 | * lock, especially in the case where there is a tight handshake between the | |
402 | * Embedded Controller driver and the BIOS. Therefore, this implementation | |
403 | * allows only one thread to acquire the HW Global Lock at a time, and makes | |
404 | * the global lock appear as a standard mutex on the OS side. | |
405 | * | |
1da177e4 | 406 | *****************************************************************************/ |
610a3d06 AS |
407 | static acpi_thread_id acpi_ev_global_lock_thread_id; |
408 | static int acpi_ev_global_lock_acquired; | |
1da177e4 | 409 | |
4be44fcd | 410 | acpi_status acpi_ev_acquire_global_lock(u16 timeout) |
1da177e4 | 411 | { |
4be44fcd LB |
412 | acpi_status status = AE_OK; |
413 | u8 acquired = FALSE; | |
1da177e4 | 414 | |
b229cf92 | 415 | ACPI_FUNCTION_TRACE(ev_acquire_global_lock); |
1da177e4 | 416 | |
c81da666 BM |
417 | /* |
418 | * Only one thread can acquire the GL at a time, the global_lock_mutex | |
419 | * enforces this. This interface releases the interpreter if we must wait. | |
420 | */ | |
ba886cd4 BM |
421 | status = acpi_ex_system_wait_mutex( |
422 | acpi_gbl_global_lock_mutex->mutex.os_mutex, 0); | |
610a3d06 AS |
423 | if (status == AE_TIME) { |
424 | if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) { | |
425 | acpi_ev_global_lock_acquired++; | |
426 | return AE_OK; | |
427 | } | |
428 | } | |
429 | ||
430 | if (ACPI_FAILURE(status)) { | |
ba886cd4 BM |
431 | status = acpi_ex_system_wait_mutex( |
432 | acpi_gbl_global_lock_mutex->mutex.os_mutex, | |
433 | timeout); | |
610a3d06 | 434 | } |
c81da666 BM |
435 | if (ACPI_FAILURE(status)) { |
436 | return_ACPI_STATUS(status); | |
1da177e4 | 437 | } |
1da177e4 | 438 | |
610a3d06 AS |
439 | acpi_ev_global_lock_thread_id = acpi_os_get_thread_id(); |
440 | acpi_ev_global_lock_acquired++; | |
441 | ||
44f6c012 | 442 | /* |
e5567afa BM |
443 | * Update the global lock handle and check for wraparound. The handle is |
444 | * only used for the external global lock interfaces, but it is updated | |
445 | * here to properly handle the case where a single thread may acquire the | |
446 | * lock via both the AML and the acpi_acquire_global_lock interfaces. The | |
447 | * handle is therefore updated on the first acquire from a given thread | |
448 | * regardless of where the acquisition request originated. | |
449 | */ | |
450 | acpi_gbl_global_lock_handle++; | |
451 | if (acpi_gbl_global_lock_handle == 0) { | |
452 | acpi_gbl_global_lock_handle = 1; | |
453 | } | |
454 | ||
455 | /* | |
9f15fc66 BM |
456 | * Make sure that a global lock actually exists. If not, just treat the |
457 | * lock as a standard mutex. | |
44f6c012 | 458 | */ |
c81da666 BM |
459 | if (!acpi_gbl_global_lock_present) { |
460 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 461 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
462 | } |
463 | ||
c81da666 | 464 | /* Attempt to acquire the actual hardware lock */ |
1da177e4 | 465 | |
009c4cbe | 466 | ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired); |
1da177e4 | 467 | if (acquired) { |
52fc0b02 | 468 | |
4be44fcd | 469 | /* We got the lock */ |
1da177e4 | 470 | |
4be44fcd | 471 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
c81da666 | 472 | "Acquired hardware Global Lock\n")); |
1da177e4 LT |
473 | |
474 | acpi_gbl_global_lock_acquired = TRUE; | |
4be44fcd | 475 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
476 | } |
477 | ||
478 | /* | |
c81da666 | 479 | * Did not get the lock. The pending bit was set above, and we must now |
1da177e4 LT |
480 | * wait until we get the global lock released interrupt. |
481 | */ | |
c81da666 | 482 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n")); |
1da177e4 LT |
483 | |
484 | /* | |
c81da666 BM |
485 | * Wait for handshake with the global lock interrupt handler. |
486 | * This interface releases the interpreter if we must wait. | |
1da177e4 | 487 | */ |
c81da666 BM |
488 | status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore, |
489 | ACPI_WAIT_FOREVER); | |
f3d2e786 | 490 | |
4be44fcd | 491 | return_ACPI_STATUS(status); |
1da177e4 LT |
492 | } |
493 | ||
1da177e4 LT |
494 | /******************************************************************************* |
495 | * | |
496 | * FUNCTION: acpi_ev_release_global_lock | |
497 | * | |
498 | * PARAMETERS: None | |
499 | * | |
500 | * RETURN: Status | |
501 | * | |
502 | * DESCRIPTION: Releases ownership of the Global Lock. | |
503 | * | |
504 | ******************************************************************************/ | |
505 | ||
4be44fcd | 506 | acpi_status acpi_ev_release_global_lock(void) |
1da177e4 | 507 | { |
4be44fcd LB |
508 | u8 pending = FALSE; |
509 | acpi_status status = AE_OK; | |
1da177e4 | 510 | |
b229cf92 | 511 | ACPI_FUNCTION_TRACE(ev_release_global_lock); |
1da177e4 | 512 | |
a72d4756 | 513 | /* Lock must be already acquired */ |
c81da666 BM |
514 | |
515 | if (!acpi_gbl_global_lock_acquired) { | |
b8e4d893 | 516 | ACPI_WARNING((AE_INFO, |
c81da666 | 517 | "Cannot release the ACPI Global Lock, it has not been acquired")); |
4be44fcd | 518 | return_ACPI_STATUS(AE_NOT_ACQUIRED); |
1da177e4 LT |
519 | } |
520 | ||
610a3d06 AS |
521 | acpi_ev_global_lock_acquired--; |
522 | if (acpi_ev_global_lock_acquired > 0) { | |
523 | return AE_OK; | |
524 | } | |
525 | ||
c81da666 | 526 | if (acpi_gbl_global_lock_present) { |
1da177e4 | 527 | |
c81da666 | 528 | /* Allow any thread to release the lock */ |
52fc0b02 | 529 | |
009c4cbe | 530 | ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending); |
1da177e4 | 531 | |
c81da666 BM |
532 | /* |
533 | * If the pending bit was set, we must write GBL_RLS to the control | |
534 | * register | |
535 | */ | |
536 | if (pending) { | |
537 | status = | |
50ffba1b | 538 | acpi_write_bit_register |
768aaaf1 BM |
539 | (ACPI_BITREG_GLOBAL_LOCK_RELEASE, |
540 | ACPI_ENABLE_EVENT); | |
c81da666 BM |
541 | } |
542 | ||
543 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
544 | "Released hardware Global Lock\n")); | |
1da177e4 LT |
545 | } |
546 | ||
1da177e4 LT |
547 | acpi_gbl_global_lock_acquired = FALSE; |
548 | ||
c81da666 | 549 | /* Release the local GL mutex */ |
89952d13 | 550 | acpi_ev_global_lock_thread_id = NULL; |
610a3d06 | 551 | acpi_ev_global_lock_acquired = 0; |
ba886cd4 | 552 | acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex); |
4be44fcd | 553 | return_ACPI_STATUS(status); |
1da177e4 LT |
554 | } |
555 | ||
1da177e4 LT |
556 | /****************************************************************************** |
557 | * | |
558 | * FUNCTION: acpi_ev_terminate | |
559 | * | |
560 | * PARAMETERS: none | |
561 | * | |
562 | * RETURN: none | |
563 | * | |
564 | * DESCRIPTION: Disable events and free memory allocated for table storage. | |
565 | * | |
566 | ******************************************************************************/ | |
567 | ||
4be44fcd | 568 | void acpi_ev_terminate(void) |
1da177e4 | 569 | { |
67a119f9 | 570 | u32 i; |
4be44fcd | 571 | acpi_status status; |
1da177e4 | 572 | |
b229cf92 | 573 | ACPI_FUNCTION_TRACE(ev_terminate); |
1da177e4 LT |
574 | |
575 | if (acpi_gbl_events_initialized) { | |
576 | /* | |
9f15fc66 BM |
577 | * Disable all event-related functionality. In all cases, on error, |
578 | * print a message but obviously we don't abort. | |
1da177e4 LT |
579 | */ |
580 | ||
581 | /* Disable all fixed events */ | |
582 | ||
583 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
67a119f9 | 584 | status = acpi_disable_event(i, 0); |
4be44fcd | 585 | if (ACPI_FAILURE(status)) { |
b8e4d893 BM |
586 | ACPI_ERROR((AE_INFO, |
587 | "Could not disable fixed event %d", | |
588 | (u32) i)); | |
1da177e4 LT |
589 | } |
590 | } | |
591 | ||
592 | /* Disable all GPEs in all GPE blocks */ | |
593 | ||
e97d6bf1 | 594 | status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL); |
1da177e4 LT |
595 | |
596 | /* Remove SCI handler */ | |
597 | ||
4be44fcd | 598 | status = acpi_ev_remove_sci_handler(); |
1da177e4 | 599 | if (ACPI_FAILURE(status)) { |
b8e4d893 | 600 | ACPI_ERROR((AE_INFO, "Could not remove SCI handler")); |
1da177e4 | 601 | } |
8876016b BM |
602 | |
603 | status = acpi_ev_remove_global_lock_handler(); | |
604 | if (ACPI_FAILURE(status)) { | |
605 | ACPI_ERROR((AE_INFO, | |
606 | "Could not remove Global Lock handler")); | |
607 | } | |
1da177e4 LT |
608 | } |
609 | ||
610 | /* Deallocate all handler objects installed within GPE info structs */ | |
611 | ||
e97d6bf1 | 612 | status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL); |
1da177e4 LT |
613 | |
614 | /* Return to original mode if necessary */ | |
615 | ||
616 | if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) { | |
4be44fcd LB |
617 | status = acpi_disable(); |
618 | if (ACPI_FAILURE(status)) { | |
b229cf92 | 619 | ACPI_WARNING((AE_INFO, "AcpiDisable failed")); |
1da177e4 LT |
620 | } |
621 | } | |
622 | return_VOID; | |
623 | } |