blob: 1d5670be729ab3cc13e8d57c639463adce8788dc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: evmisc - Miscellaneous event manager support functions
4 *
5 *****************************************************************************/
6
7/*
Len Brown75a44ce2008-04-23 23:00:13 -04008 * Copyright (C) 2000 - 2008, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
Len Brown4be44fc2005-08-05 00:44:28 -040050ACPI_MODULE_NAME("evmisc")
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Bob Mooref3d2e782007-02-02 19:48:18 +030052/* Pointer to FACS needed for the Global Lock */
Bob Mooref3d2e782007-02-02 19:48:18 +030053static struct acpi_table_facs *facs = NULL;
54
Robert Moore44f6c012005-04-18 22:49:35 -040055/* Local prototypes */
56
Len Brown4be44fc2005-08-05 00:44:28 -040057static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
Robert Moore44f6c012005-04-18 22:49:35 -040058
Len Brown4be44fc2005-08-05 00:44:28 -040059static u32 acpi_ev_global_lock_handler(void *context);
Robert Moore44f6c012005-04-18 22:49:35 -040060
Bob Moore88760162007-02-02 19:48:22 +030061static acpi_status acpi_ev_remove_global_lock_handler(void);
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063/*******************************************************************************
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
Len Brown4be44fc2005-08-05 00:44:28 -040077u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
79 switch (node->type) {
80 case ACPI_TYPE_DEVICE:
81 case ACPI_TYPE_PROCESSOR:
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070093/*******************************************************************************
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400108acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
109 u32 notify_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Len Brown4be44fc2005-08-05 00:44:28 -0400111 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Bob Mooreb229cf92006-04-21 17:15:00 -0400116 ACPI_FUNCTION_NAME(ev_queue_notify_request);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 /*
119 * For value 3 (Ejection Request), some device method may need to be run.
Robert Moore44f6c012005-04-18 22:49:35 -0400120 * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
121 * to be run.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 * For value 0x80 (Status Change) on the power button or sleep button,
Robert Moore44f6c012005-04-18 22:49:35 -0400123 * initiate soft-off or sleep operation?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 */
Len Brown4be44fc2005-08-05 00:44:28 -0400125 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Zhang Rui514d18d2008-04-10 19:06:44 +0400126 "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)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 /* Get the notify object attached to the NS Node */
131
Len Brown4be44fc2005-08-05 00:44:28 -0400132 obj_desc = acpi_ns_get_attached_object(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (obj_desc) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 /* We have the notify object, Get the right handler */
136
137 switch (node->type) {
Zhang Rui514d18d2008-04-10 19:06:44 +0400138
139 /* Notify allowed only on these types */
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 case ACPI_TYPE_DEVICE:
142 case ACPI_TYPE_THERMAL:
143 case ACPI_TYPE_PROCESSOR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
Len Brown4be44fc2005-08-05 00:44:28 -0400146 handler_obj =
147 obj_desc->common_notify.system_notify;
148 } else {
149 handler_obj =
150 obj_desc->common_notify.device_notify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152 break;
153
154 default:
155 /* All other types are not supported */
156 return (AE_TYPE);
157 }
158 }
159
Zhang Rui514d18d2008-04-10 19:06:44 +0400160 /*
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 */
Len Brown4be44fc2005-08-05 00:44:28 -0400167 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();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (!notify_info) {
173 return (AE_NO_MEMORY);
174 }
175
Zhang Rui514d18d2008-04-10 19:06:44 +0400176 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
Bob Moore616861242006-03-17 16:44:00 -0500183 notify_info->common.descriptor_type =
184 ACPI_DESC_TYPE_STATE_NOTIFY;
Len Brown4be44fc2005-08-05 00:44:28 -0400185 notify_info->notify.node = node;
186 notify_info->notify.value = (u16) notify_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 notify_info->notify.handler_obj = handler_obj;
188
Len Brown40d07082007-05-09 22:59:38 -0400189 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 }
Zhang Rui514d18d2008-04-10 19:06:44 +0400195 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 /*
Zhang Rui514d18d2008-04-10 19:06:44 +0400197 * There is no notify handler (per-device or system) for this device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 */
Len Brown4be44fc2005-08-05 00:44:28 -0400199 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Zhang Rui514d18d2008-04-10 19:06:44 +0400200 "No notify handler for Notify (%4.4s, %X) node %p\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400201 acpi_ut_get_node_name(node), notify_value,
202 node));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
204
205 return (status);
206}
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208/*******************************************************************************
209 *
210 * FUNCTION: acpi_ev_notify_dispatch
211 *
Robert Moore44f6c012005-04-18 22:49:35 -0400212 * PARAMETERS: Context - To be passed to the notify handler
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 *
214 * RETURN: None.
215 *
216 * DESCRIPTION: Dispatch a device notification event to a previously
217 * installed handler.
218 *
219 ******************************************************************************/
220
Len Brown4be44fc2005-08-05 00:44:28 -0400221static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Len Brown4be44fc2005-08-05 00:44:28 -0400223 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Len Brown4be44fc2005-08-05 00:44:28 -0400229 ACPI_FUNCTION_ENTRY();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 /*
232 * We will invoke a global notify handler if installed.
Robert Moore44f6c012005-04-18 22:49:35 -0400233 * This is done _before_ we invoke the per-device handler attached
234 * to the device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 */
236 if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 /* 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 }
Len Brown4be44fc2005-08-05 00:44:28 -0400244 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 /* 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) {
Len Brown4be44fc2005-08-05 00:44:28 -0400256 global_handler(notify_info->notify.node,
257 notify_info->notify.value, global_context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
259
260 /* Now invoke the per-device handler, if present */
261
262 handler_obj = notify_info->notify.handler_obj;
263 if (handler_obj) {
Len Brown4be44fc2005-08-05 00:44:28 -0400264 handler_obj->notify.handler(notify_info->notify.node,
265 notify_info->notify.value,
266 handler_obj->notify.context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268
269 /* All done with the info object */
270
Len Brown4be44fc2005-08-05 00:44:28 -0400271 acpi_ut_delete_generic_state(notify_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274/*******************************************************************************
275 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 * FUNCTION: acpi_ev_global_lock_handler
277 *
278 * PARAMETERS: Context - From thread interface, not used
279 *
Bob Moorea72d4752007-02-02 19:48:18 +0300280 * RETURN: ACPI_INTERRUPT_HANDLED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 *
282 * DESCRIPTION: Invoked directly from the SCI handler when a global lock
Bob Moorea72d4752007-02-02 19:48:18 +0300283 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 *
290 ******************************************************************************/
291
Len Brown4be44fc2005-08-05 00:44:28 -0400292static u32 acpi_ev_global_lock_handler(void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
Len Brown4be44fc2005-08-05 00:44:28 -0400294 u8 acquired = FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 /*
Bob Moorec81da662007-02-02 19:48:18 +0300297 * Attempt to get the lock.
298 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 * If we don't get it now, it will be marked pending and we will
300 * take another interrupt when it becomes free.
301 */
Bob Mooref3d2e782007-02-02 19:48:18 +0300302 ACPI_ACQUIRE_GLOBAL_LOCK(facs, acquired);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 if (acquired) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 /* Got the lock, now wake all threads waiting for it */
Bob Moorec81da662007-02-02 19:48:18 +0300306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 acpi_gbl_global_lock_acquired = TRUE;
Bob Moorea72d4752007-02-02 19:48:18 +0300308 /* Send a unit to the semaphore */
309
Len Brownfd350942007-05-09 23:34:35 -0400310 if (ACPI_FAILURE
311 (acpi_os_signal_semaphore
312 (acpi_gbl_global_lock_semaphore, 1))) {
Bob Moorea72d4752007-02-02 19:48:18 +0300313 ACPI_ERROR((AE_INFO,
314 "Could not signal Global Lock semaphore"));
315 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
317
318 return (ACPI_INTERRUPT_HANDLED);
319}
320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321/*******************************************************************************
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
Len Brown4be44fc2005-08-05 00:44:28 -0400333acpi_status acpi_ev_init_global_lock_handler(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
Len Brown4be44fc2005-08-05 00:44:28 -0400335 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Bob Mooreb229cf92006-04-21 17:15:00 -0400337 ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Bob Moore1d18c052008-04-10 19:06:40 +0400339 status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
340 ACPI_CAST_INDIRECT_PTR(struct
341 acpi_table_header,
342 &facs));
Bob Mooref3d2e782007-02-02 19:48:18 +0300343 if (ACPI_FAILURE(status)) {
344 return_ACPI_STATUS(status);
345 }
346
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 acpi_gbl_global_lock_present = TRUE;
Len Brown4be44fc2005-08-05 00:44:28 -0400348 status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
349 acpi_ev_global_lock_handler,
350 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
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) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500360 ACPI_ERROR((AE_INFO,
361 "No response from Global Lock hardware, disabling lock"));
Robert Moore0c9938c2005-07-29 15:15:00 -0700362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 acpi_gbl_global_lock_present = FALSE;
364 status = AE_OK;
365 }
366
Len Brown4be44fc2005-08-05 00:44:28 -0400367 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368}
369
Bob Moore88760162007-02-02 19:48:22 +0300370/*******************************************************************************
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
382static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395/******************************************************************************
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 *
Bob Moorec81da662007-02-02 19:48:18 +0300405 * 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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 *****************************************************************************/
Alexey Starikovskiy610a3d02007-03-07 00:57:30 -0500416static acpi_thread_id acpi_ev_global_lock_thread_id;
417static int acpi_ev_global_lock_acquired;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
Len Brown4be44fc2005-08-05 00:44:28 -0400419acpi_status acpi_ev_acquire_global_lock(u16 timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
Len Brown4be44fc2005-08-05 00:44:28 -0400421 acpi_status status = AE_OK;
422 u8 acquired = FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Bob Mooreb229cf92006-04-21 17:15:00 -0400424 ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Bob Moorec81da662007-02-02 19:48:18 +0300426 /*
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 */
Bob Mooreba886cd2008-04-10 19:06:37 +0400430 status = acpi_ex_system_wait_mutex(
431 acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
Alexey Starikovskiy610a3d02007-03-07 00:57:30 -0500432 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)) {
Bob Mooreba886cd2008-04-10 19:06:37 +0400440 status = acpi_ex_system_wait_mutex(
441 acpi_gbl_global_lock_mutex->mutex.os_mutex,
442 timeout);
Alexey Starikovskiy610a3d02007-03-07 00:57:30 -0500443 }
Bob Moorec81da662007-02-02 19:48:18 +0300444 if (ACPI_FAILURE(status)) {
445 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Alexey Starikovskiy610a3d02007-03-07 00:57:30 -0500448 acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
449 acpi_ev_global_lock_acquired++;
450
Robert Moore44f6c012005-04-18 22:49:35 -0400451 /*
Bob Mooree5567af2008-04-10 19:06:38 +0400452 * 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 /*
Bob Moorec81da662007-02-02 19:48:18 +0300465 * Make sure that a global lock actually exists. If not, just treat
466 * the lock as a standard mutex.
Robert Moore44f6c012005-04-18 22:49:35 -0400467 */
Bob Moorec81da662007-02-02 19:48:18 +0300468 if (!acpi_gbl_global_lock_present) {
469 acpi_gbl_global_lock_acquired = TRUE;
Len Brown4be44fc2005-08-05 00:44:28 -0400470 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 }
472
Bob Moorec81da662007-02-02 19:48:18 +0300473 /* Attempt to acquire the actual hardware lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Bob Mooref3d2e782007-02-02 19:48:18 +0300475 ACPI_ACQUIRE_GLOBAL_LOCK(facs, acquired);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if (acquired) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400477
Len Brown4be44fc2005-08-05 00:44:28 -0400478 /* We got the lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Len Brown4be44fc2005-08-05 00:44:28 -0400480 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
Bob Moorec81da662007-02-02 19:48:18 +0300481 "Acquired hardware Global Lock\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 acpi_gbl_global_lock_acquired = TRUE;
Len Brown4be44fc2005-08-05 00:44:28 -0400484 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 }
486
487 /*
Bob Moorec81da662007-02-02 19:48:18 +0300488 * Did not get the lock. The pending bit was set above, and we must now
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 * wait until we get the global lock released interrupt.
490 */
Bob Moorec81da662007-02-02 19:48:18 +0300491 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
493 /*
Bob Moorec81da662007-02-02 19:48:18 +0300494 * Wait for handshake with the global lock interrupt handler.
495 * This interface releases the interpreter if we must wait.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 */
Bob Moorec81da662007-02-02 19:48:18 +0300497 status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
498 ACPI_WAIT_FOREVER);
Bob Mooref3d2e782007-02-02 19:48:18 +0300499
Len Brown4be44fc2005-08-05 00:44:28 -0400500 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503/*******************************************************************************
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
Len Brown4be44fc2005-08-05 00:44:28 -0400515acpi_status acpi_ev_release_global_lock(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
Len Brown4be44fc2005-08-05 00:44:28 -0400517 u8 pending = FALSE;
518 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Bob Mooreb229cf92006-04-21 17:15:00 -0400520 ACPI_FUNCTION_TRACE(ev_release_global_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Bob Moorea72d4752007-02-02 19:48:18 +0300522 /* Lock must be already acquired */
Bob Moorec81da662007-02-02 19:48:18 +0300523
524 if (!acpi_gbl_global_lock_acquired) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500525 ACPI_WARNING((AE_INFO,
Bob Moorec81da662007-02-02 19:48:18 +0300526 "Cannot release the ACPI Global Lock, it has not been acquired"));
Len Brown4be44fc2005-08-05 00:44:28 -0400527 return_ACPI_STATUS(AE_NOT_ACQUIRED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 }
529
Alexey Starikovskiy610a3d02007-03-07 00:57:30 -0500530 acpi_ev_global_lock_acquired--;
531 if (acpi_ev_global_lock_acquired > 0) {
532 return AE_OK;
533 }
534
Bob Moorec81da662007-02-02 19:48:18 +0300535 if (acpi_gbl_global_lock_present) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Bob Moorec81da662007-02-02 19:48:18 +0300537 /* Allow any thread to release the lock */
Bob Moore52fc0b02006-10-02 00:00:00 -0400538
Bob Mooref3d2e782007-02-02 19:48:18 +0300539 ACPI_RELEASE_GLOBAL_LOCK(facs, pending);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Bob Moorec81da662007-02-02 19:48:18 +0300541 /*
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,
Bob Moored8c71b62007-02-02 19:48:21 +0300548 1);
Bob Moorec81da662007-02-02 19:48:18 +0300549 }
550
551 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
552 "Released hardware Global Lock\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 acpi_gbl_global_lock_acquired = FALSE;
556
Bob Moorec81da662007-02-02 19:48:18 +0300557 /* Release the local GL mutex */
Al Viro89952d12007-03-14 09:17:59 +0000558 acpi_ev_global_lock_thread_id = NULL;
Alexey Starikovskiy610a3d02007-03-07 00:57:30 -0500559 acpi_ev_global_lock_acquired = 0;
Bob Mooreba886cd2008-04-10 19:06:37 +0400560 acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
Len Brown4be44fc2005-08-05 00:44:28 -0400561 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562}
563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564/******************************************************************************
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
Len Brown4be44fc2005-08-05 00:44:28 -0400576void acpi_ev_terminate(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Bob Moore67a119f2008-06-10 13:42:13 +0800578 u32 i;
Len Brown4be44fc2005-08-05 00:44:28 -0400579 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Bob Mooreb229cf92006-04-21 17:15:00 -0400581 ACPI_FUNCTION_TRACE(ev_terminate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
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++) {
Bob Moore67a119f2008-06-10 13:42:13 +0800592 status = acpi_disable_event(i, 0);
Len Brown4be44fc2005-08-05 00:44:28 -0400593 if (ACPI_FAILURE(status)) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500594 ACPI_ERROR((AE_INFO,
595 "Could not disable fixed event %d",
596 (u32) i));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 }
598 }
599
600 /* Disable all GPEs in all GPE blocks */
601
Len Brown4be44fc2005-08-05 00:44:28 -0400602 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
604 /* Remove SCI handler */
605
Len Brown4be44fc2005-08-05 00:44:28 -0400606 status = acpi_ev_remove_sci_handler();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if (ACPI_FAILURE(status)) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500608 ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 }
Bob Moore88760162007-02-02 19:48:22 +0300610
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 }
617
618 /* Deallocate all handler objects installed within GPE info structs */
619
Len Brown4be44fc2005-08-05 00:44:28 -0400620 status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 /* Return to original mode if necessary */
623
624 if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
Len Brown4be44fc2005-08-05 00:44:28 -0400625 status = acpi_disable();
626 if (ACPI_FAILURE(status)) {
Bob Mooreb229cf92006-04-21 17:15:00 -0400627 ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
629 }
630 return_VOID;
631}