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-rw-r--r--drivers/acpi/acpica/Makefile2
-rw-r--r--drivers/acpi/acpica/acevents.h17
-rw-r--r--drivers/acpi/acpica/evglock.c335
-rw-r--r--drivers/acpi/acpica/evmisc.c309
4 files changed, 347 insertions, 316 deletions
diff --git a/drivers/acpi/acpica/Makefile b/drivers/acpi/acpica/Makefile
index a1224712fd0c..301bd2d388ad 100644
--- a/drivers/acpi/acpica/Makefile
+++ b/drivers/acpi/acpica/Makefile
@@ -14,7 +14,7 @@ acpi-y := dsfield.o dsmthdat.o dsopcode.o dswexec.o dswscope.o \
14 14
15acpi-y += evevent.o evregion.o evsci.o evxfevnt.o \ 15acpi-y += evevent.o evregion.o evsci.o evxfevnt.o \
16 evmisc.o evrgnini.o evxface.o evxfregn.o \ 16 evmisc.o evrgnini.o evxface.o evxfregn.o \
17 evgpe.o evgpeblk.o evgpeinit.o evgpeutil.o evxfgpe.o 17 evgpe.o evgpeblk.o evgpeinit.o evgpeutil.o evxfgpe.o evglock.o
18 18
19acpi-y += exconfig.o exfield.o exnames.o exoparg6.o exresolv.o exstorob.o\ 19acpi-y += exconfig.o exfield.o exnames.o exoparg6.o exresolv.o exstorob.o\
20 exconvrt.o exfldio.o exoparg1.o exprep.o exresop.o exsystem.o\ 20 exconvrt.o exfldio.o exoparg1.o exprep.o exresop.o exsystem.o\
diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 41d247daf461..bea3b4899183 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -58,12 +58,6 @@ u32 acpi_ev_fixed_event_detect(void);
58 */ 58 */
59u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node); 59u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node);
60 60
61acpi_status acpi_ev_acquire_global_lock(u16 timeout);
62
63acpi_status acpi_ev_release_global_lock(void);
64
65acpi_status acpi_ev_init_global_lock_handler(void);
66
67u32 acpi_ev_get_gpe_number_index(u32 gpe_number); 61u32 acpi_ev_get_gpe_number_index(u32 gpe_number);
68 62
69acpi_status 63acpi_status
@@ -71,6 +65,17 @@ acpi_ev_queue_notify_request(struct acpi_namespace_node *node,
71 u32 notify_value); 65 u32 notify_value);
72 66
73/* 67/*
68 * evglock - Global Lock support
69 */
70acpi_status acpi_ev_init_global_lock_handler(void);
71
72acpi_status acpi_ev_acquire_global_lock(u16 timeout);
73
74acpi_status acpi_ev_release_global_lock(void);
75
76acpi_status acpi_ev_remove_global_lock_handler(void);
77
78/*
74 * evgpe - Low-level GPE support 79 * evgpe - Low-level GPE support
75 */ 80 */
76u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list); 81u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list);
diff --git a/drivers/acpi/acpica/evglock.c b/drivers/acpi/acpica/evglock.c
new file mode 100644
index 000000000000..56a562a1e5d7
--- /dev/null
+++ b/drivers/acpi/acpica/evglock.c
@@ -0,0 +1,335 @@
1/******************************************************************************
2 *
3 * Module Name: evglock - Global Lock support
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, Intel Corp.
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 "accommon.h"
46#include "acevents.h"
47#include "acinterp.h"
48
49#define _COMPONENT ACPI_EVENTS
50ACPI_MODULE_NAME("evglock")
51
52/* Local prototypes */
53static u32 acpi_ev_global_lock_handler(void *context);
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_ev_init_global_lock_handler
58 *
59 * PARAMETERS: None
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Install a handler for the global lock release event
64 *
65 ******************************************************************************/
66
67acpi_status acpi_ev_init_global_lock_handler(void)
68{
69 acpi_status status;
70
71 ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
72
73 /* Attempt installation of the global lock handler */
74
75 status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
76 acpi_ev_global_lock_handler,
77 NULL);
78
79 /*
80 * If the global lock does not exist on this platform, the attempt to
81 * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
82 * Map to AE_OK, but mark global lock as not present. Any attempt to
83 * actually use the global lock will be flagged with an error.
84 */
85 acpi_gbl_global_lock_present = FALSE;
86 if (status == AE_NO_HARDWARE_RESPONSE) {
87 ACPI_ERROR((AE_INFO,
88 "No response from Global Lock hardware, disabling lock"));
89
90 return_ACPI_STATUS(AE_OK);
91 }
92
93 status = acpi_os_create_lock(&acpi_gbl_global_lock_pending_lock);
94 if (ACPI_FAILURE(status)) {
95 return_ACPI_STATUS(status);
96 }
97
98 acpi_gbl_global_lock_pending = FALSE;
99 acpi_gbl_global_lock_present = TRUE;
100 return_ACPI_STATUS(status);
101}
102
103/*******************************************************************************
104 *
105 * FUNCTION: acpi_ev_remove_global_lock_handler
106 *
107 * PARAMETERS: None
108 *
109 * RETURN: Status
110 *
111 * DESCRIPTION: Remove the handler for the Global Lock
112 *
113 ******************************************************************************/
114
115acpi_status acpi_ev_remove_global_lock_handler(void)
116{
117 acpi_status status;
118
119 ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
120
121 acpi_gbl_global_lock_present = FALSE;
122 status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
123 acpi_ev_global_lock_handler);
124
125 return_ACPI_STATUS(status);
126}
127
128/*******************************************************************************
129 *
130 * FUNCTION: acpi_ev_global_lock_handler
131 *
132 * PARAMETERS: Context - From thread interface, not used
133 *
134 * RETURN: ACPI_INTERRUPT_HANDLED
135 *
136 * DESCRIPTION: Invoked directly from the SCI handler when a global lock
137 * release interrupt occurs. If there is actually a pending
138 * request for the lock, signal the waiting thread.
139 *
140 ******************************************************************************/
141
142static u32 acpi_ev_global_lock_handler(void *context)
143{
144 acpi_status status;
145 acpi_cpu_flags flags;
146
147 flags = acpi_os_acquire_lock(acpi_gbl_global_lock_pending_lock);
148
149 /*
150 * If a request for the global lock is not actually pending,
151 * we are done. This handles "spurious" global lock interrupts
152 * which are possible (and have been seen) with bad BIOSs.
153 */
154 if (!acpi_gbl_global_lock_pending) {
155 goto cleanup_and_exit;
156 }
157
158 /*
159 * Send a unit to the global lock semaphore. The actual acquisition
160 * of the global lock will be performed by the waiting thread.
161 */
162 status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1);
163 if (ACPI_FAILURE(status)) {
164 ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));
165 }
166
167 acpi_gbl_global_lock_pending = FALSE;
168
169 cleanup_and_exit:
170
171 acpi_os_release_lock(acpi_gbl_global_lock_pending_lock, flags);
172 return (ACPI_INTERRUPT_HANDLED);
173}
174
175/******************************************************************************
176 *
177 * FUNCTION: acpi_ev_acquire_global_lock
178 *
179 * PARAMETERS: Timeout - Max time to wait for the lock, in millisec.
180 *
181 * RETURN: Status
182 *
183 * DESCRIPTION: Attempt to gain ownership of the Global Lock.
184 *
185 * MUTEX: Interpreter must be locked
186 *
187 * Note: The original implementation allowed multiple threads to "acquire" the
188 * Global Lock, and the OS would hold the lock until the last thread had
189 * released it. However, this could potentially starve the BIOS out of the
190 * lock, especially in the case where there is a tight handshake between the
191 * Embedded Controller driver and the BIOS. Therefore, this implementation
192 * allows only one thread to acquire the HW Global Lock at a time, and makes
193 * the global lock appear as a standard mutex on the OS side.
194 *
195 *****************************************************************************/
196
197acpi_status acpi_ev_acquire_global_lock(u16 timeout)
198{
199 acpi_cpu_flags flags;
200 acpi_status status;
201 u8 acquired = FALSE;
202
203 ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
204
205 /*
206 * Only one thread can acquire the GL at a time, the global_lock_mutex
207 * enforces this. This interface releases the interpreter if we must wait.
208 */
209 status =
210 acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex->mutex.
211 os_mutex, timeout);
212 if (ACPI_FAILURE(status)) {
213 return_ACPI_STATUS(status);
214 }
215
216 /*
217 * Update the global lock handle and check for wraparound. The handle is
218 * only used for the external global lock interfaces, but it is updated
219 * here to properly handle the case where a single thread may acquire the
220 * lock via both the AML and the acpi_acquire_global_lock interfaces. The
221 * handle is therefore updated on the first acquire from a given thread
222 * regardless of where the acquisition request originated.
223 */
224 acpi_gbl_global_lock_handle++;
225 if (acpi_gbl_global_lock_handle == 0) {
226 acpi_gbl_global_lock_handle = 1;
227 }
228
229 /*
230 * Make sure that a global lock actually exists. If not, just
231 * treat the lock as a standard mutex.
232 */
233 if (!acpi_gbl_global_lock_present) {
234 acpi_gbl_global_lock_acquired = TRUE;
235 return_ACPI_STATUS(AE_OK);
236 }
237
238 flags = acpi_os_acquire_lock(acpi_gbl_global_lock_pending_lock);
239
240 do {
241
242 /* Attempt to acquire the actual hardware lock */
243
244 ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
245 if (acquired) {
246 acpi_gbl_global_lock_acquired = TRUE;
247 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
248 "Acquired hardware Global Lock\n"));
249 break;
250 }
251
252 /*
253 * Did not get the lock. The pending bit was set above, and
254 * we must now wait until we receive the global lock
255 * released interrupt.
256 */
257 acpi_gbl_global_lock_pending = TRUE;
258 acpi_os_release_lock(acpi_gbl_global_lock_pending_lock, flags);
259
260 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
261 "Waiting for hardware Global Lock\n"));
262
263 /*
264 * Wait for handshake with the global lock interrupt handler.
265 * This interface releases the interpreter if we must wait.
266 */
267 status =
268 acpi_ex_system_wait_semaphore
269 (acpi_gbl_global_lock_semaphore, ACPI_WAIT_FOREVER);
270
271 flags = acpi_os_acquire_lock(acpi_gbl_global_lock_pending_lock);
272
273 } while (ACPI_SUCCESS(status));
274
275 acpi_gbl_global_lock_pending = FALSE;
276 acpi_os_release_lock(acpi_gbl_global_lock_pending_lock, flags);
277
278 return_ACPI_STATUS(status);
279}
280
281/*******************************************************************************
282 *
283 * FUNCTION: acpi_ev_release_global_lock
284 *
285 * PARAMETERS: None
286 *
287 * RETURN: Status
288 *
289 * DESCRIPTION: Releases ownership of the Global Lock.
290 *
291 ******************************************************************************/
292
293acpi_status acpi_ev_release_global_lock(void)
294{
295 u8 pending = FALSE;
296 acpi_status status = AE_OK;
297
298 ACPI_FUNCTION_TRACE(ev_release_global_lock);
299
300 /* Lock must be already acquired */
301
302 if (!acpi_gbl_global_lock_acquired) {
303 ACPI_WARNING((AE_INFO,
304 "Cannot release the ACPI Global Lock, it has not been acquired"));
305 return_ACPI_STATUS(AE_NOT_ACQUIRED);
306 }
307
308 if (acpi_gbl_global_lock_present) {
309
310 /* Allow any thread to release the lock */
311
312 ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
313
314 /*
315 * If the pending bit was set, we must write GBL_RLS to the control
316 * register
317 */
318 if (pending) {
319 status =
320 acpi_write_bit_register
321 (ACPI_BITREG_GLOBAL_LOCK_RELEASE,
322 ACPI_ENABLE_EVENT);
323 }
324
325 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
326 "Released hardware Global Lock\n"));
327 }
328
329 acpi_gbl_global_lock_acquired = FALSE;
330
331 /* Release the local GL mutex */
332
333 acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
334 return_ACPI_STATUS(status);
335}
diff --git a/drivers/acpi/acpica/evmisc.c b/drivers/acpi/acpica/evmisc.c
index 69a3b4aa862b..d0b331844427 100644
--- a/drivers/acpi/acpica/evmisc.c
+++ b/drivers/acpi/acpica/evmisc.c
@@ -45,7 +45,6 @@
45#include "accommon.h" 45#include "accommon.h"
46#include "acevents.h" 46#include "acevents.h"
47#include "acnamesp.h" 47#include "acnamesp.h"
48#include "acinterp.h"
49 48
50#define _COMPONENT ACPI_EVENTS 49#define _COMPONENT ACPI_EVENTS
51ACPI_MODULE_NAME("evmisc") 50ACPI_MODULE_NAME("evmisc")
@@ -53,10 +52,6 @@ ACPI_MODULE_NAME("evmisc")
53/* Local prototypes */ 52/* Local prototypes */
54static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context); 53static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
55 54
56static u32 acpi_ev_global_lock_handler(void *context);
57
58static acpi_status acpi_ev_remove_global_lock_handler(void);
59
60/******************************************************************************* 55/*******************************************************************************
61 * 56 *
62 * FUNCTION: acpi_ev_is_notify_object 57 * FUNCTION: acpi_ev_is_notify_object
@@ -275,310 +270,6 @@ static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
275 acpi_ut_delete_generic_state(notify_info); 270 acpi_ut_delete_generic_state(notify_info);
276} 271}
277 272
278/*******************************************************************************
279 *
280 * FUNCTION: acpi_ev_global_lock_handler
281 *
282 * PARAMETERS: Context - From thread interface, not used
283 *
284 * RETURN: ACPI_INTERRUPT_HANDLED
285 *
286 * DESCRIPTION: Invoked directly from the SCI handler when a global lock
287 * release interrupt occurs. If there is actually a pending
288 * request for the lock, signal the waiting thread.
289 *
290 ******************************************************************************/
291
292static u32 acpi_ev_global_lock_handler(void *context)
293{
294 acpi_status status;
295 acpi_cpu_flags flags;
296
297 flags = acpi_os_acquire_lock(acpi_gbl_global_lock_pending_lock);
298
299 /*
300 * If a request for the global lock is not actually pending,
301 * we are done. This handles "spurious" global lock interrupts
302 * which are possible (and have been seen) with bad BIOSs.
303 */
304 if (!acpi_gbl_global_lock_pending) {
305 goto cleanup_and_exit;
306 }
307
308 /*
309 * Send a unit to the global lock semaphore. The actual acquisition
310 * of the global lock will be performed by the waiting thread.
311 */
312 status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1);
313 if (ACPI_FAILURE(status)) {
314 ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));
315 }
316
317 acpi_gbl_global_lock_pending = FALSE;
318
319cleanup_and_exit:
320
321 acpi_os_release_lock(acpi_gbl_global_lock_pending_lock, flags);
322 return (ACPI_INTERRUPT_HANDLED);
323}
324
325/*******************************************************************************
326 *
327 * FUNCTION: acpi_ev_init_global_lock_handler
328 *
329 * PARAMETERS: None
330 *
331 * RETURN: Status
332 *
333 * DESCRIPTION: Install a handler for the global lock release event
334 *
335 ******************************************************************************/
336
337acpi_status acpi_ev_init_global_lock_handler(void)
338{
339 acpi_status status;
340
341 ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
342
343 /* Attempt installation of the global lock handler */
344
345 status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
346 acpi_ev_global_lock_handler,
347 NULL);
348
349 /*
350 * If the global lock does not exist on this platform, the attempt to
351 * enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
352 * Map to AE_OK, but mark global lock as not present. Any attempt to
353 * actually use the global lock will be flagged with an error.
354 */
355 acpi_gbl_global_lock_present = FALSE;
356 if (status == AE_NO_HARDWARE_RESPONSE) {
357 ACPI_ERROR((AE_INFO,
358 "No response from Global Lock hardware, disabling lock"));
359
360 return_ACPI_STATUS(AE_OK);
361 }
362
363 status = acpi_os_create_lock(&acpi_gbl_global_lock_pending_lock);
364 if (ACPI_FAILURE(status)) {
365 return_ACPI_STATUS(status);
366 }
367
368 acpi_gbl_global_lock_pending = FALSE;
369 acpi_gbl_global_lock_present = TRUE;
370 return_ACPI_STATUS(status);
371}
372
373/*******************************************************************************
374 *
375 * FUNCTION: acpi_ev_remove_global_lock_handler
376 *
377 * PARAMETERS: None
378 *
379 * RETURN: Status
380 *
381 * DESCRIPTION: Remove the handler for the Global Lock
382 *
383 ******************************************************************************/
384
385static acpi_status acpi_ev_remove_global_lock_handler(void)
386{
387 acpi_status status;
388
389 ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
390
391 acpi_gbl_global_lock_present = FALSE;
392 status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
393 acpi_ev_global_lock_handler);
394
395 return_ACPI_STATUS(status);
396}
397
398/******************************************************************************
399 *
400 * FUNCTION: acpi_ev_acquire_global_lock
401 *
402 * PARAMETERS: Timeout - Max time to wait for the lock, in millisec.
403 *
404 * RETURN: Status
405 *
406 * DESCRIPTION: Attempt to gain ownership of the Global Lock.
407 *
408 * MUTEX: Interpreter must be locked
409 *
410 * Note: The original implementation allowed multiple threads to "acquire" the
411 * Global Lock, and the OS would hold the lock until the last thread had
412 * released it. However, this could potentially starve the BIOS out of the
413 * lock, especially in the case where there is a tight handshake between the
414 * Embedded Controller driver and the BIOS. Therefore, this implementation
415 * allows only one thread to acquire the HW Global Lock at a time, and makes
416 * the global lock appear as a standard mutex on the OS side.
417 *
418 *****************************************************************************/
419static acpi_thread_id acpi_ev_global_lock_thread_id;
420static int acpi_ev_global_lock_acquired;
421
422acpi_status acpi_ev_acquire_global_lock(u16 timeout)
423{
424 acpi_cpu_flags flags;
425 acpi_status status;
426 u8 acquired = FALSE;
427
428 ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
429
430 /*
431 * Only one thread can acquire the GL at a time, the global_lock_mutex
432 * enforces this. This interface releases the interpreter if we must wait.
433 */
434 status = acpi_ex_system_wait_mutex(
435 acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
436 if (status == AE_TIME) {
437 if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
438 acpi_ev_global_lock_acquired++;
439 return AE_OK;
440 }
441 }
442
443 if (ACPI_FAILURE(status)) {
444 status = acpi_ex_system_wait_mutex(
445 acpi_gbl_global_lock_mutex->mutex.os_mutex,
446 timeout);
447 }
448 if (ACPI_FAILURE(status)) {
449 return_ACPI_STATUS(status);
450 }
451
452 acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
453 acpi_ev_global_lock_acquired++;
454
455 /*
456 * Update the global lock handle and check for wraparound. The handle is
457 * only used for the external global lock interfaces, but it is updated
458 * here to properly handle the case where a single thread may acquire the
459 * lock via both the AML and the acpi_acquire_global_lock interfaces. The
460 * handle is therefore updated on the first acquire from a given thread
461 * regardless of where the acquisition request originated.
462 */
463 acpi_gbl_global_lock_handle++;
464 if (acpi_gbl_global_lock_handle == 0) {
465 acpi_gbl_global_lock_handle = 1;
466 }
467
468 /*
469 * Make sure that a global lock actually exists. If not, just
470 * treat the lock as a standard mutex.
471 */
472 if (!acpi_gbl_global_lock_present) {
473 acpi_gbl_global_lock_acquired = TRUE;
474 return_ACPI_STATUS(AE_OK);
475 }
476
477 flags = acpi_os_acquire_lock(acpi_gbl_global_lock_pending_lock);
478
479 do {
480
481 /* Attempt to acquire the actual hardware lock */
482
483 ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
484 if (acquired) {
485 acpi_gbl_global_lock_acquired = TRUE;
486 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
487 "Acquired hardware Global Lock\n"));
488 break;
489 }
490
491 /*
492 * Did not get the lock. The pending bit was set above, and
493 * we must now wait until we receive the global lock
494 * released interrupt.
495 */
496 acpi_gbl_global_lock_pending = TRUE;
497 acpi_os_release_lock(acpi_gbl_global_lock_pending_lock, flags);
498
499 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
500 "Waiting for hardware Global Lock\n"));
501
502 /*
503 * Wait for handshake with the global lock interrupt handler.
504 * This interface releases the interpreter if we must wait.
505 */
506 status =
507 acpi_ex_system_wait_semaphore
508 (acpi_gbl_global_lock_semaphore, ACPI_WAIT_FOREVER);
509
510 flags = acpi_os_acquire_lock(acpi_gbl_global_lock_pending_lock);
511
512 } while (ACPI_SUCCESS(status));
513
514 acpi_gbl_global_lock_pending = FALSE;
515 acpi_os_release_lock(acpi_gbl_global_lock_pending_lock, flags);
516
517 return_ACPI_STATUS(status);
518}
519
520/*******************************************************************************
521 *
522 * FUNCTION: acpi_ev_release_global_lock
523 *
524 * PARAMETERS: None
525 *
526 * RETURN: Status
527 *
528 * DESCRIPTION: Releases ownership of the Global Lock.
529 *
530 ******************************************************************************/
531
532acpi_status acpi_ev_release_global_lock(void)
533{
534 u8 pending = FALSE;
535 acpi_status status = AE_OK;
536
537 ACPI_FUNCTION_TRACE(ev_release_global_lock);
538
539 /* Lock must be already acquired */
540
541 if (!acpi_gbl_global_lock_acquired) {
542 ACPI_WARNING((AE_INFO,
543 "Cannot release the ACPI Global Lock, it has not been acquired"));
544 return_ACPI_STATUS(AE_NOT_ACQUIRED);
545 }
546
547 acpi_ev_global_lock_acquired--;
548 if (acpi_ev_global_lock_acquired > 0) {
549 return AE_OK;
550 }
551
552 if (acpi_gbl_global_lock_present) {
553
554 /* Allow any thread to release the lock */
555
556 ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
557
558 /*
559 * If the pending bit was set, we must write GBL_RLS to the control
560 * register
561 */
562 if (pending) {
563 status =
564 acpi_write_bit_register
565 (ACPI_BITREG_GLOBAL_LOCK_RELEASE,
566 ACPI_ENABLE_EVENT);
567 }
568
569 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
570 "Released hardware Global Lock\n"));
571 }
572
573 acpi_gbl_global_lock_acquired = FALSE;
574
575 /* Release the local GL mutex */
576 acpi_ev_global_lock_thread_id = 0;
577 acpi_ev_global_lock_acquired = 0;
578 acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
579 return_ACPI_STATUS(status);
580}
581
582/****************************************************************************** 273/******************************************************************************
583 * 274 *
584 * FUNCTION: acpi_ev_terminate 275 * FUNCTION: acpi_ev_terminate
generated by cgit v1.2.2 (git 2.25.0) at 2026-04-04 22:31:23 -0400