195857638SErik Schmauss // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
295b482a8SLen Brown /******************************************************************************
395b482a8SLen Brown *
495b482a8SLen Brown * Module Name: exmutex - ASL Mutex Acquire/Release functions
595b482a8SLen Brown *
6*612c2932SBob Moore * Copyright (C) 2000 - 2023, Intel Corp.
795b482a8SLen Brown *
895857638SErik Schmauss *****************************************************************************/
995b482a8SLen Brown
1095b482a8SLen Brown #include <acpi/acpi.h>
11e2f7a777SLen Brown #include "accommon.h"
12e2f7a777SLen Brown #include "acinterp.h"
13e2f7a777SLen Brown #include "acevents.h"
1495b482a8SLen Brown
1595b482a8SLen Brown #define _COMPONENT ACPI_EXECUTER
1695b482a8SLen Brown ACPI_MODULE_NAME("exmutex")
1795b482a8SLen Brown
1895b482a8SLen Brown /* Local prototypes */
1995b482a8SLen Brown static void
2095b482a8SLen Brown acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
2195b482a8SLen Brown struct acpi_thread_state *thread);
2295b482a8SLen Brown
2395b482a8SLen Brown /*******************************************************************************
2495b482a8SLen Brown *
2595b482a8SLen Brown * FUNCTION: acpi_ex_unlink_mutex
2695b482a8SLen Brown *
2795b482a8SLen Brown * PARAMETERS: obj_desc - The mutex to be unlinked
2895b482a8SLen Brown *
2995b482a8SLen Brown * RETURN: None
3095b482a8SLen Brown *
3195b482a8SLen Brown * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
3295b482a8SLen Brown *
3395b482a8SLen Brown ******************************************************************************/
3495b482a8SLen Brown
acpi_ex_unlink_mutex(union acpi_operand_object * obj_desc)3595b482a8SLen Brown void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
3695b482a8SLen Brown {
3795b482a8SLen Brown struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
3895b482a8SLen Brown
3995b482a8SLen Brown if (!thread) {
4095b482a8SLen Brown return;
4195b482a8SLen Brown }
4295b482a8SLen Brown
4395b482a8SLen Brown /* Doubly linked list */
4495b482a8SLen Brown
4595b482a8SLen Brown if (obj_desc->mutex.next) {
4695b482a8SLen Brown (obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
4795b482a8SLen Brown }
4895b482a8SLen Brown
4995b482a8SLen Brown if (obj_desc->mutex.prev) {
5095b482a8SLen Brown (obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
5110a3b461SBob Moore
5210a3b461SBob Moore /*
53a7499bc8SBob Moore * Migrate the previous sync level associated with this mutex to
54a7499bc8SBob Moore * the previous mutex on the list so that it may be preserved.
55a7499bc8SBob Moore * This handles the case where several mutexes have been acquired
56a7499bc8SBob Moore * at the same level, but are not released in opposite order.
5710a3b461SBob Moore */
5810a3b461SBob Moore (obj_desc->mutex.prev)->mutex.original_sync_level =
5910a3b461SBob Moore obj_desc->mutex.original_sync_level;
6095b482a8SLen Brown } else {
6195b482a8SLen Brown thread->acquired_mutex_list = obj_desc->mutex.next;
6295b482a8SLen Brown }
6395b482a8SLen Brown }
6495b482a8SLen Brown
6595b482a8SLen Brown /*******************************************************************************
6695b482a8SLen Brown *
6795b482a8SLen Brown * FUNCTION: acpi_ex_link_mutex
6895b482a8SLen Brown *
6995b482a8SLen Brown * PARAMETERS: obj_desc - The mutex to be linked
70ba494beeSBob Moore * thread - Current executing thread object
7195b482a8SLen Brown *
7295b482a8SLen Brown * RETURN: None
7395b482a8SLen Brown *
7495b482a8SLen Brown * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
7595b482a8SLen Brown *
7695b482a8SLen Brown ******************************************************************************/
7795b482a8SLen Brown
7895b482a8SLen Brown static void
acpi_ex_link_mutex(union acpi_operand_object * obj_desc,struct acpi_thread_state * thread)7995b482a8SLen Brown acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
8095b482a8SLen Brown struct acpi_thread_state *thread)
8195b482a8SLen Brown {
8295b482a8SLen Brown union acpi_operand_object *list_head;
8395b482a8SLen Brown
8495b482a8SLen Brown list_head = thread->acquired_mutex_list;
8595b482a8SLen Brown
8695b482a8SLen Brown /* This object will be the first object in the list */
8795b482a8SLen Brown
8895b482a8SLen Brown obj_desc->mutex.prev = NULL;
8995b482a8SLen Brown obj_desc->mutex.next = list_head;
9095b482a8SLen Brown
9195b482a8SLen Brown /* Update old first object to point back to this object */
9295b482a8SLen Brown
9395b482a8SLen Brown if (list_head) {
9495b482a8SLen Brown list_head->mutex.prev = obj_desc;
9595b482a8SLen Brown }
9695b482a8SLen Brown
9795b482a8SLen Brown /* Update list head */
9895b482a8SLen Brown
9995b482a8SLen Brown thread->acquired_mutex_list = obj_desc;
10095b482a8SLen Brown }
10195b482a8SLen Brown
10295b482a8SLen Brown /*******************************************************************************
10395b482a8SLen Brown *
10495b482a8SLen Brown * FUNCTION: acpi_ex_acquire_mutex_object
10595b482a8SLen Brown *
106ba494beeSBob Moore * PARAMETERS: timeout - Timeout in milliseconds
10795b482a8SLen Brown * obj_desc - Mutex object
108a7499bc8SBob Moore * thread_id - Current thread state
10995b482a8SLen Brown *
11095b482a8SLen Brown * RETURN: Status
11195b482a8SLen Brown *
11295b482a8SLen Brown * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
11395b482a8SLen Brown * path that supports multiple acquires by the same thread.
11495b482a8SLen Brown *
11595b482a8SLen Brown * MUTEX: Interpreter must be locked
11695b482a8SLen Brown *
11795b482a8SLen Brown * NOTE: This interface is called from three places:
11895b482a8SLen Brown * 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator
11995b482a8SLen Brown * 2) From acpi_ex_acquire_global_lock when an AML Field access requires the
12095b482a8SLen Brown * global lock
12195b482a8SLen Brown * 3) From the external interface, acpi_acquire_global_lock
12295b482a8SLen Brown *
12395b482a8SLen Brown ******************************************************************************/
12495b482a8SLen Brown
12595b482a8SLen Brown acpi_status
acpi_ex_acquire_mutex_object(u16 timeout,union acpi_operand_object * obj_desc,acpi_thread_id thread_id)12695b482a8SLen Brown acpi_ex_acquire_mutex_object(u16 timeout,
12795b482a8SLen Brown union acpi_operand_object *obj_desc,
12895b482a8SLen Brown acpi_thread_id thread_id)
12995b482a8SLen Brown {
13095b482a8SLen Brown acpi_status status;
13195b482a8SLen Brown
13295b482a8SLen Brown ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
13395b482a8SLen Brown
13495b482a8SLen Brown if (!obj_desc) {
13595b482a8SLen Brown return_ACPI_STATUS(AE_BAD_PARAMETER);
13695b482a8SLen Brown }
13795b482a8SLen Brown
13895b482a8SLen Brown /* Support for multiple acquires by the owning thread */
13995b482a8SLen Brown
14095b482a8SLen Brown if (obj_desc->mutex.thread_id == thread_id) {
14195b482a8SLen Brown /*
14295b482a8SLen Brown * The mutex is already owned by this thread, just increment the
14395b482a8SLen Brown * acquisition depth
14495b482a8SLen Brown */
14595b482a8SLen Brown obj_desc->mutex.acquisition_depth++;
14695b482a8SLen Brown return_ACPI_STATUS(AE_OK);
14795b482a8SLen Brown }
14895b482a8SLen Brown
14995b482a8SLen Brown /* Acquire the mutex, wait if necessary. Special case for Global Lock */
15095b482a8SLen Brown
15195b482a8SLen Brown if (obj_desc == acpi_gbl_global_lock_mutex) {
15295b482a8SLen Brown status = acpi_ev_acquire_global_lock(timeout);
15395b482a8SLen Brown } else {
154cd162b35SBob Moore status =
155cd162b35SBob Moore acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
15695b482a8SLen Brown timeout);
15795b482a8SLen Brown }
15895b482a8SLen Brown
15995b482a8SLen Brown if (ACPI_FAILURE(status)) {
16095b482a8SLen Brown
16195b482a8SLen Brown /* Includes failure from a timeout on time_desc */
16295b482a8SLen Brown
16395b482a8SLen Brown return_ACPI_STATUS(status);
16495b482a8SLen Brown }
16595b482a8SLen Brown
16695b482a8SLen Brown /* Acquired the mutex: update mutex object */
16795b482a8SLen Brown
16895b482a8SLen Brown obj_desc->mutex.thread_id = thread_id;
16995b482a8SLen Brown obj_desc->mutex.acquisition_depth = 1;
17095b482a8SLen Brown obj_desc->mutex.original_sync_level = 0;
17195b482a8SLen Brown obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */
17295b482a8SLen Brown
17395b482a8SLen Brown return_ACPI_STATUS(AE_OK);
17495b482a8SLen Brown }
17595b482a8SLen Brown
17695b482a8SLen Brown /*******************************************************************************
17795b482a8SLen Brown *
17895b482a8SLen Brown * FUNCTION: acpi_ex_acquire_mutex
17995b482a8SLen Brown *
18095b482a8SLen Brown * PARAMETERS: time_desc - Timeout integer
18195b482a8SLen Brown * obj_desc - Mutex object
18295b482a8SLen Brown * walk_state - Current method execution state
18395b482a8SLen Brown *
18495b482a8SLen Brown * RETURN: Status
18595b482a8SLen Brown *
18695b482a8SLen Brown * DESCRIPTION: Acquire an AML mutex
18795b482a8SLen Brown *
18895b482a8SLen Brown ******************************************************************************/
18995b482a8SLen Brown
19095b482a8SLen Brown acpi_status
acpi_ex_acquire_mutex(union acpi_operand_object * time_desc,union acpi_operand_object * obj_desc,struct acpi_walk_state * walk_state)19195b482a8SLen Brown acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
19295b482a8SLen Brown union acpi_operand_object *obj_desc,
19395b482a8SLen Brown struct acpi_walk_state *walk_state)
19495b482a8SLen Brown {
19595b482a8SLen Brown acpi_status status;
19695b482a8SLen Brown
19795b482a8SLen Brown ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);
19895b482a8SLen Brown
19995b482a8SLen Brown if (!obj_desc) {
20095b482a8SLen Brown return_ACPI_STATUS(AE_BAD_PARAMETER);
20195b482a8SLen Brown }
20295b482a8SLen Brown
203a7499bc8SBob Moore /* Must have a valid thread state struct */
20495b482a8SLen Brown
20595b482a8SLen Brown if (!walk_state->thread) {
20695b482a8SLen Brown ACPI_ERROR((AE_INFO,
20795b482a8SLen Brown "Cannot acquire Mutex [%4.4s], null thread info",
20895b482a8SLen Brown acpi_ut_get_node_name(obj_desc->mutex.node)));
20995b482a8SLen Brown return_ACPI_STATUS(AE_AML_INTERNAL);
21095b482a8SLen Brown }
21195b482a8SLen Brown
21295b482a8SLen Brown /*
213cd162b35SBob Moore * Current sync level must be less than or equal to the sync level
214cd162b35SBob Moore * of the mutex. This mechanism provides some deadlock prevention.
21595b482a8SLen Brown */
21695b482a8SLen Brown if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
21795b482a8SLen Brown ACPI_ERROR((AE_INFO,
218cd162b35SBob Moore "Cannot acquire Mutex [%4.4s], "
219cd162b35SBob Moore "current SyncLevel is too large (%u)",
22095b482a8SLen Brown acpi_ut_get_node_name(obj_desc->mutex.node),
22195b482a8SLen Brown walk_state->thread->current_sync_level));
22295b482a8SLen Brown return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
22395b482a8SLen Brown }
22495b482a8SLen Brown
225cd162b35SBob Moore ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
226cd162b35SBob Moore "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
227cd162b35SBob Moore "Depth %u TID %p\n",
228cd162b35SBob Moore obj_desc->mutex.sync_level,
229cd162b35SBob Moore walk_state->thread->current_sync_level,
230cd162b35SBob Moore obj_desc->mutex.acquisition_depth,
231cd162b35SBob Moore walk_state->thread));
232cd162b35SBob Moore
23395b482a8SLen Brown status = acpi_ex_acquire_mutex_object((u16)time_desc->integer.value,
23495b482a8SLen Brown obj_desc,
23595b482a8SLen Brown walk_state->thread->thread_id);
236cd162b35SBob Moore
23795b482a8SLen Brown if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {
23895b482a8SLen Brown
23995b482a8SLen Brown /* Save Thread object, original/current sync levels */
24095b482a8SLen Brown
24195b482a8SLen Brown obj_desc->mutex.owner_thread = walk_state->thread;
24295b482a8SLen Brown obj_desc->mutex.original_sync_level =
24395b482a8SLen Brown walk_state->thread->current_sync_level;
24495b482a8SLen Brown walk_state->thread->current_sync_level =
24595b482a8SLen Brown obj_desc->mutex.sync_level;
24695b482a8SLen Brown
24795b482a8SLen Brown /* Link the mutex to the current thread for force-unlock at method exit */
24895b482a8SLen Brown
24995b482a8SLen Brown acpi_ex_link_mutex(obj_desc, walk_state->thread);
25095b482a8SLen Brown }
25195b482a8SLen Brown
252cd162b35SBob Moore ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
253cd162b35SBob Moore "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
254cd162b35SBob Moore obj_desc->mutex.sync_level,
255cd162b35SBob Moore walk_state->thread->current_sync_level,
256cd162b35SBob Moore obj_desc->mutex.acquisition_depth));
257cd162b35SBob Moore
25895b482a8SLen Brown return_ACPI_STATUS(status);
25995b482a8SLen Brown }
26095b482a8SLen Brown
26195b482a8SLen Brown /*******************************************************************************
26295b482a8SLen Brown *
26395b482a8SLen Brown * FUNCTION: acpi_ex_release_mutex_object
26495b482a8SLen Brown *
26595b482a8SLen Brown * PARAMETERS: obj_desc - The object descriptor for this op
26695b482a8SLen Brown *
26795b482a8SLen Brown * RETURN: Status
26895b482a8SLen Brown *
26995b482a8SLen Brown * DESCRIPTION: Release a previously acquired Mutex, low level interface.
27095b482a8SLen Brown * Provides a common path that supports multiple releases (after
27195b482a8SLen Brown * previous multiple acquires) by the same thread.
27295b482a8SLen Brown *
27395b482a8SLen Brown * MUTEX: Interpreter must be locked
27495b482a8SLen Brown *
27595b482a8SLen Brown * NOTE: This interface is called from three places:
27695b482a8SLen Brown * 1) From acpi_ex_release_mutex, via an AML Acquire() operator
27795b482a8SLen Brown * 2) From acpi_ex_release_global_lock when an AML Field access requires the
27895b482a8SLen Brown * global lock
27995b482a8SLen Brown * 3) From the external interface, acpi_release_global_lock
28095b482a8SLen Brown *
28195b482a8SLen Brown ******************************************************************************/
28295b482a8SLen Brown
acpi_ex_release_mutex_object(union acpi_operand_object * obj_desc)28395b482a8SLen Brown acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
28495b482a8SLen Brown {
28595b482a8SLen Brown acpi_status status = AE_OK;
28695b482a8SLen Brown
28795b482a8SLen Brown ACPI_FUNCTION_TRACE(ex_release_mutex_object);
28895b482a8SLen Brown
28995b482a8SLen Brown if (obj_desc->mutex.acquisition_depth == 0) {
29068aafc35SBob Moore return_ACPI_STATUS(AE_NOT_ACQUIRED);
29195b482a8SLen Brown }
29295b482a8SLen Brown
29395b482a8SLen Brown /* Match multiple Acquires with multiple Releases */
29495b482a8SLen Brown
29595b482a8SLen Brown obj_desc->mutex.acquisition_depth--;
29695b482a8SLen Brown if (obj_desc->mutex.acquisition_depth != 0) {
29795b482a8SLen Brown
29895b482a8SLen Brown /* Just decrement the depth and return */
29995b482a8SLen Brown
30095b482a8SLen Brown return_ACPI_STATUS(AE_OK);
30195b482a8SLen Brown }
30295b482a8SLen Brown
30395b482a8SLen Brown if (obj_desc->mutex.owner_thread) {
30495b482a8SLen Brown
30595b482a8SLen Brown /* Unlink the mutex from the owner's list */
30695b482a8SLen Brown
30795b482a8SLen Brown acpi_ex_unlink_mutex(obj_desc);
30895b482a8SLen Brown obj_desc->mutex.owner_thread = NULL;
30995b482a8SLen Brown }
31095b482a8SLen Brown
31195b482a8SLen Brown /* Release the mutex, special case for Global Lock */
31295b482a8SLen Brown
31395b482a8SLen Brown if (obj_desc == acpi_gbl_global_lock_mutex) {
31495b482a8SLen Brown status = acpi_ev_release_global_lock();
31595b482a8SLen Brown } else {
31695b482a8SLen Brown acpi_os_release_mutex(obj_desc->mutex.os_mutex);
31795b482a8SLen Brown }
31895b482a8SLen Brown
31995b482a8SLen Brown /* Clear mutex info */
32095b482a8SLen Brown
32128eb3fcfSLin Ming obj_desc->mutex.thread_id = 0;
32295b482a8SLen Brown return_ACPI_STATUS(status);
32395b482a8SLen Brown }
32495b482a8SLen Brown
32595b482a8SLen Brown /*******************************************************************************
32695b482a8SLen Brown *
32795b482a8SLen Brown * FUNCTION: acpi_ex_release_mutex
32895b482a8SLen Brown *
32995b482a8SLen Brown * PARAMETERS: obj_desc - The object descriptor for this op
33095b482a8SLen Brown * walk_state - Current method execution state
33195b482a8SLen Brown *
33295b482a8SLen Brown * RETURN: Status
33395b482a8SLen Brown *
33495b482a8SLen Brown * DESCRIPTION: Release a previously acquired Mutex.
33595b482a8SLen Brown *
33695b482a8SLen Brown ******************************************************************************/
33795b482a8SLen Brown
33895b482a8SLen Brown acpi_status
acpi_ex_release_mutex(union acpi_operand_object * obj_desc,struct acpi_walk_state * walk_state)33995b482a8SLen Brown acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
34095b482a8SLen Brown struct acpi_walk_state *walk_state)
34195b482a8SLen Brown {
34210a3b461SBob Moore u8 previous_sync_level;
343e0f40281SLin Ming struct acpi_thread_state *owner_thread;
344cd162b35SBob Moore acpi_status status = AE_OK;
34595b482a8SLen Brown
34695b482a8SLen Brown ACPI_FUNCTION_TRACE(ex_release_mutex);
34795b482a8SLen Brown
34895b482a8SLen Brown if (!obj_desc) {
34995b482a8SLen Brown return_ACPI_STATUS(AE_BAD_PARAMETER);
35095b482a8SLen Brown }
35195b482a8SLen Brown
352e0f40281SLin Ming owner_thread = obj_desc->mutex.owner_thread;
353e0f40281SLin Ming
35495b482a8SLen Brown /* The mutex must have been previously acquired in order to release it */
35595b482a8SLen Brown
356e0f40281SLin Ming if (!owner_thread) {
35795b482a8SLen Brown ACPI_ERROR((AE_INFO,
35895b482a8SLen Brown "Cannot release Mutex [%4.4s], not acquired",
35995b482a8SLen Brown acpi_ut_get_node_name(obj_desc->mutex.node)));
36095b482a8SLen Brown return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
36195b482a8SLen Brown }
36295b482a8SLen Brown
36375c8044fSLv Zheng /* Must have a valid thread ID */
3643e8214e5SLv Zheng
365fbc3be2aSDan Carpenter if (!walk_state->thread) {
366fbc3be2aSDan Carpenter ACPI_ERROR((AE_INFO,
367fbc3be2aSDan Carpenter "Cannot release Mutex [%4.4s], null thread info",
368fbc3be2aSDan Carpenter acpi_ut_get_node_name(obj_desc->mutex.node)));
369fbc3be2aSDan Carpenter return_ACPI_STATUS(AE_AML_INTERNAL);
370fbc3be2aSDan Carpenter }
371fbc3be2aSDan Carpenter
37295b482a8SLen Brown /*
37395b482a8SLen Brown * The Mutex is owned, but this thread must be the owner.
37495b482a8SLen Brown * Special case for Global Lock, any thread can release
37595b482a8SLen Brown */
376e0f40281SLin Ming if ((owner_thread->thread_id != walk_state->thread->thread_id) &&
377e0f40281SLin Ming (obj_desc != acpi_gbl_global_lock_mutex)) {
37895b482a8SLen Brown ACPI_ERROR((AE_INFO,
37928eb3fcfSLin Ming "Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
38028eb3fcfSLin Ming (u32)walk_state->thread->thread_id,
38195b482a8SLen Brown acpi_ut_get_node_name(obj_desc->mutex.node),
38228eb3fcfSLin Ming (u32)owner_thread->thread_id));
38395b482a8SLen Brown return_ACPI_STATUS(AE_AML_NOT_OWNER);
38495b482a8SLen Brown }
38595b482a8SLen Brown
38695b482a8SLen Brown /*
387315c7288SBob Moore * The sync level of the mutex must be equal to the current sync level. In
388315c7288SBob Moore * other words, the current level means that at least one mutex at that
389315c7288SBob Moore * level is currently being held. Attempting to release a mutex of a
390315c7288SBob Moore * different level can only mean that the mutex ordering rule is being
391315c7288SBob Moore * violated. This behavior is clarified in ACPI 4.0 specification.
39295b482a8SLen Brown */
393e0f40281SLin Ming if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) {
39495b482a8SLen Brown ACPI_ERROR((AE_INFO,
395cd162b35SBob Moore "Cannot release Mutex [%4.4s], SyncLevel mismatch: "
396cd162b35SBob Moore "mutex %u current %u",
39795b482a8SLen Brown acpi_ut_get_node_name(obj_desc->mutex.node),
39895b482a8SLen Brown obj_desc->mutex.sync_level,
39995b482a8SLen Brown walk_state->thread->current_sync_level));
40095b482a8SLen Brown return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
40195b482a8SLen Brown }
40295b482a8SLen Brown
40310a3b461SBob Moore /*
40410a3b461SBob Moore * Get the previous sync_level from the head of the acquired mutex list.
40510a3b461SBob Moore * This handles the case where several mutexes at the same level have been
40610a3b461SBob Moore * acquired, but are not released in reverse order.
40710a3b461SBob Moore */
40810a3b461SBob Moore previous_sync_level =
409e0f40281SLin Ming owner_thread->acquired_mutex_list->mutex.original_sync_level;
41010a3b461SBob Moore
411cd162b35SBob Moore ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
412cd162b35SBob Moore "Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
413cd162b35SBob Moore "Prev SyncLevel %u, Depth %u TID %p\n",
414cd162b35SBob Moore obj_desc->mutex.sync_level,
415cd162b35SBob Moore walk_state->thread->current_sync_level,
416cd162b35SBob Moore previous_sync_level,
417cd162b35SBob Moore obj_desc->mutex.acquisition_depth,
418cd162b35SBob Moore walk_state->thread));
419cd162b35SBob Moore
42095b482a8SLen Brown status = acpi_ex_release_mutex_object(obj_desc);
421315c7288SBob Moore if (ACPI_FAILURE(status)) {
422315c7288SBob Moore return_ACPI_STATUS(status);
423315c7288SBob Moore }
42495b482a8SLen Brown
42595b482a8SLen Brown if (obj_desc->mutex.acquisition_depth == 0) {
42695b482a8SLen Brown
427315c7288SBob Moore /* Restore the previous sync_level */
42895b482a8SLen Brown
429e0f40281SLin Ming owner_thread->current_sync_level = previous_sync_level;
43095b482a8SLen Brown }
431a7499bc8SBob Moore
432cd162b35SBob Moore ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
433cd162b35SBob Moore "Released: Object SyncLevel %u, Thread SyncLevel, %u, "
434cd162b35SBob Moore "Prev SyncLevel %u, Depth %u\n",
435cd162b35SBob Moore obj_desc->mutex.sync_level,
436cd162b35SBob Moore walk_state->thread->current_sync_level,
437cd162b35SBob Moore previous_sync_level,
438cd162b35SBob Moore obj_desc->mutex.acquisition_depth));
439cd162b35SBob Moore
44095b482a8SLen Brown return_ACPI_STATUS(status);
44195b482a8SLen Brown }
44295b482a8SLen Brown
44395b482a8SLen Brown /*******************************************************************************
44495b482a8SLen Brown *
44595b482a8SLen Brown * FUNCTION: acpi_ex_release_all_mutexes
44695b482a8SLen Brown *
447ba494beeSBob Moore * PARAMETERS: thread - Current executing thread object
44895b482a8SLen Brown *
44995b482a8SLen Brown * RETURN: Status
45095b482a8SLen Brown *
45195b482a8SLen Brown * DESCRIPTION: Release all mutexes held by this thread
45295b482a8SLen Brown *
45395b482a8SLen Brown * NOTE: This function is called as the thread is exiting the interpreter.
45495b482a8SLen Brown * Mutexes are not released when an individual control method is exited, but
45595b482a8SLen Brown * only when the parent thread actually exits the interpreter. This allows one
45695b482a8SLen Brown * method to acquire a mutex, and a different method to release it, as long as
45795b482a8SLen Brown * this is performed underneath a single parent control method.
45895b482a8SLen Brown *
45995b482a8SLen Brown ******************************************************************************/
46095b482a8SLen Brown
acpi_ex_release_all_mutexes(struct acpi_thread_state * thread)46195b482a8SLen Brown void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
46295b482a8SLen Brown {
46395b482a8SLen Brown union acpi_operand_object *next = thread->acquired_mutex_list;
46495b482a8SLen Brown union acpi_operand_object *obj_desc;
46595b482a8SLen Brown
466cd162b35SBob Moore ACPI_FUNCTION_TRACE(ex_release_all_mutexes);
46795b482a8SLen Brown
46895b482a8SLen Brown /* Traverse the list of owned mutexes, releasing each one */
46995b482a8SLen Brown
47095b482a8SLen Brown while (next) {
47195b482a8SLen Brown obj_desc = next;
4722489ef01SBob Moore ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
473cd162b35SBob Moore "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
474cd162b35SBob Moore obj_desc->mutex.node->name.ascii,
475cd162b35SBob Moore obj_desc->mutex.sync_level,
476cd162b35SBob Moore obj_desc->mutex.acquisition_depth));
4772489ef01SBob Moore
47895b482a8SLen Brown /* Release the mutex, special case for Global Lock */
47995b482a8SLen Brown
48095b482a8SLen Brown if (obj_desc == acpi_gbl_global_lock_mutex) {
48195b482a8SLen Brown
48295b482a8SLen Brown /* Ignore errors */
48395b482a8SLen Brown
48495b482a8SLen Brown (void)acpi_ev_release_global_lock();
48595b482a8SLen Brown } else {
48695b482a8SLen Brown acpi_os_release_mutex(obj_desc->mutex.os_mutex);
48795b482a8SLen Brown }
48895b482a8SLen Brown
48995b482a8SLen Brown /* Update Thread sync_level (Last mutex is the important one) */
49095b482a8SLen Brown
49195b482a8SLen Brown thread->current_sync_level =
49295b482a8SLen Brown obj_desc->mutex.original_sync_level;
493cd162b35SBob Moore
494cd162b35SBob Moore /* Mark mutex unowned */
495cd162b35SBob Moore
496cd162b35SBob Moore next = obj_desc->mutex.next;
497cd162b35SBob Moore
498cd162b35SBob Moore obj_desc->mutex.prev = NULL;
499cd162b35SBob Moore obj_desc->mutex.next = NULL;
500cd162b35SBob Moore obj_desc->mutex.acquisition_depth = 0;
501cd162b35SBob Moore obj_desc->mutex.owner_thread = NULL;
502cd162b35SBob Moore obj_desc->mutex.thread_id = 0;
50395b482a8SLen Brown }
504cd162b35SBob Moore
505cd162b35SBob Moore return_VOID;
50695b482a8SLen Brown }
507