Release 4.11 drivers/acpi/acpica/exmutex.c
/******************************************************************************
*
* Module Name: exmutex - ASL Mutex Acquire/Release functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2017, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acevents.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME("exmutex")
/* Local prototypes */
static void
acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
struct acpi_thread_state *thread);
/*******************************************************************************
*
* FUNCTION: acpi_ex_unlink_mutex
*
* PARAMETERS: obj_desc - The mutex to be unlinked
*
* RETURN: None
*
* DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
*
******************************************************************************/
void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
{
struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
if (!thread) {
return;
}
/* Doubly linked list */
if (obj_desc->mutex.next) {
(obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
}
if (obj_desc->mutex.prev) {
(obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
/*
* Migrate the previous sync level associated with this mutex to
* the previous mutex on the list so that it may be preserved.
* This handles the case where several mutexes have been acquired
* at the same level, but are not released in opposite order.
*/
(obj_desc->mutex.prev)->mutex.original_sync_level =
obj_desc->mutex.original_sync_level;
} else {
thread->acquired_mutex_list = obj_desc->mutex.next;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 62 | 52.54% | 2 | 20.00% |
| Andy Grover | 26 | 22.03% | 3 | 30.00% |
| Robert Moore | 19 | 16.10% | 2 | 20.00% |
| Len Brown | 11 | 9.32% | 3 | 30.00% |
| Total | 118 | 100.00% | 10 | 100.00% |
/*******************************************************************************
*
* FUNCTION: acpi_ex_link_mutex
*
* PARAMETERS: obj_desc - The mutex to be linked
* thread - Current executing thread object
*
* RETURN: None
*
* DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
*
******************************************************************************/
static void
acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
struct acpi_thread_state *thread)
{
union acpi_operand_object *list_head;
list_head = thread->acquired_mutex_list;
/* This object will be the first object in the list */
obj_desc->mutex.prev = NULL;
obj_desc->mutex.next = list_head;
/* Update old first object to point back to this object */
if (list_head) {
list_head->mutex.prev = obj_desc;
}
/* Update list head */
thread->acquired_mutex_list = obj_desc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 47 | 71.21% | 2 | 33.33% |
| Andy Grover | 18 | 27.27% | 3 | 50.00% |
| Robert Moore | 1 | 1.52% | 1 | 16.67% |
| Total | 66 | 100.00% | 6 | 100.00% |
/*******************************************************************************
*
* FUNCTION: acpi_ex_acquire_mutex_object
*
* PARAMETERS: timeout - Timeout in milliseconds
* obj_desc - Mutex object
* thread_id - Current thread state
*
* RETURN: Status
*
* DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
* path that supports multiple acquires by the same thread.
*
* MUTEX: Interpreter must be locked
*
* NOTE: This interface is called from three places:
* 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator
* 2) From acpi_ex_acquire_global_lock when an AML Field access requires the
* global lock
* 3) From the external interface, acpi_acquire_global_lock
*
******************************************************************************/
acpi_status
acpi_ex_acquire_mutex_object(u16 timeout,
union acpi_operand_object *obj_desc,
acpi_thread_id thread_id)
{
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
if (!obj_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Support for multiple acquires by the owning thread */
if (obj_desc->mutex.thread_id == thread_id) {
/*
* The mutex is already owned by this thread, just increment the
* acquisition depth
*/
obj_desc->mutex.acquisition_depth++;
return_ACPI_STATUS(AE_OK);
}
/* Acquire the mutex, wait if necessary. Special case for Global Lock */
if (obj_desc == acpi_gbl_global_lock_mutex) {
status = acpi_ev_acquire_global_lock(timeout);
} else {
status =
acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
timeout);
}
if (ACPI_FAILURE(status)) {
/* Includes failure from a timeout on time_desc */
return_ACPI_STATUS(status);
}
/* Acquired the mutex: update mutex object */
obj_desc->mutex.thread_id = thread_id;
obj_desc->mutex.acquisition_depth = 1;
obj_desc->mutex.original_sync_level = 0;
obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */
return_ACPI_STATUS(AE_OK);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Robert Moore | 150 | 100.00% | 3 | 100.00% |
| Total | 150 | 100.00% | 3 | 100.00% |
/*******************************************************************************
*
* FUNCTION: acpi_ex_acquire_mutex
*
* PARAMETERS: time_desc - Timeout integer
* obj_desc - Mutex object
* walk_state - Current method execution state
*
* RETURN: Status
*
* DESCRIPTION: Acquire an AML mutex
*
******************************************************************************/
acpi_status
acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
union acpi_operand_object *obj_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);
if (!obj_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Must have a valid thread state struct */
if (!walk_state->thread) {
ACPI_ERROR((AE_INFO,
"Cannot acquire Mutex [%4.4s], null thread info",
acpi_ut_get_node_name(obj_desc->mutex.node)));
return_ACPI_STATUS(AE_AML_INTERNAL);
}
/*
* Current sync level must be less than or equal to the sync level
* of the mutex. This mechanism provides some deadlock prevention.
*/
if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
ACPI_ERROR((AE_INFO,
"Cannot acquire Mutex [%4.4s], "
"current SyncLevel is too large (%u)",
acpi_ut_get_node_name(obj_desc->mutex.node),
walk_state->thread->current_sync_level));
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
"Depth %u TID %p\n",
obj_desc->mutex.sync_level,
walk_state->thread->current_sync_level,
obj_desc->mutex.acquisition_depth,
walk_state->thread));
status = acpi_ex_acquire_mutex_object((u16)time_desc->integer.value,
obj_desc,
walk_state->thread->thread_id);
if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {
/* Save Thread object, original/current sync levels */
obj_desc->mutex.owner_thread = walk_state->thread;
obj_desc->mutex.original_sync_level =
walk_state->thread->current_sync_level;
walk_state->thread->current_sync_level =
obj_desc->mutex.sync_level;
/* Link the mutex to the current thread for force-unlock at method exit */
acpi_ex_link_mutex(obj_desc, walk_state->thread);
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
obj_desc->mutex.sync_level,
walk_state->thread->current_sync_level,
obj_desc->mutex.acquisition_depth));
return_ACPI_STATUS(status);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Robert Moore | 104 | 38.52% | 8 | 50.00% |
| Linus Torvalds | 102 | 37.78% | 2 | 12.50% |
| Andy Grover | 46 | 17.04% | 3 | 18.75% |
| Len Brown | 18 | 6.67% | 3 | 18.75% |
| Total | 270 | 100.00% | 16 | 100.00% |
/*******************************************************************************
*
* FUNCTION: acpi_ex_release_mutex_object
*
* PARAMETERS: obj_desc - The object descriptor for this op
*
* RETURN: Status
*
* DESCRIPTION: Release a previously acquired Mutex, low level interface.
* Provides a common path that supports multiple releases (after
* previous multiple acquires) by the same thread.
*
* MUTEX: Interpreter must be locked
*
* NOTE: This interface is called from three places:
* 1) From acpi_ex_release_mutex, via an AML Acquire() operator
* 2) From acpi_ex_release_global_lock when an AML Field access requires the
* global lock
* 3) From the external interface, acpi_release_global_lock
*
******************************************************************************/
acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ex_release_mutex_object);
if (obj_desc->mutex.acquisition_depth == 0) {
return_ACPI_STATUS(AE_NOT_ACQUIRED);
}
/* Match multiple Acquires with multiple Releases */
obj_desc->mutex.acquisition_depth--;
if (obj_desc->mutex.acquisition_depth != 0) {
/* Just decrement the depth and return */
return_ACPI_STATUS(AE_OK);
}
if (obj_desc->mutex.owner_thread) {
/* Unlink the mutex from the owner's list */
acpi_ex_unlink_mutex(obj_desc);
obj_desc->mutex.owner_thread = NULL;
}
/* Release the mutex, special case for Global Lock */
if (obj_desc == acpi_gbl_global_lock_mutex) {
status = acpi_ev_release_global_lock();
} else {
acpi_os_release_mutex(obj_desc->mutex.os_mutex);
}
/* Clear mutex info */
obj_desc->mutex.thread_id = 0;
return_ACPI_STATUS(status);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Robert Moore | 85 | 66.93% | 5 | 38.46% |
| Linus Torvalds | 31 | 24.41% | 2 | 15.38% |
| Andy Grover | 7 | 5.51% | 3 | 23.08% |
| Len Brown | 3 | 2.36% | 2 | 15.38% |
| Lin Ming | 1 | 0.79% | 1 | 7.69% |
| Total | 127 | 100.00% | 13 | 100.00% |
/*******************************************************************************
*
* FUNCTION: acpi_ex_release_mutex
*
* PARAMETERS: obj_desc - The object descriptor for this op
* walk_state - Current method execution state
*
* RETURN: Status
*
* DESCRIPTION: Release a previously acquired Mutex.
*
******************************************************************************/
acpi_status
acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
struct acpi_walk_state *walk_state)
{
u8 previous_sync_level;
struct acpi_thread_state *owner_thread;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ex_release_mutex);
if (!obj_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
owner_thread = obj_desc->mutex.owner_thread;
/* The mutex must have been previously acquired in order to release it */
if (!owner_thread) {
ACPI_ERROR((AE_INFO,
"Cannot release Mutex [%4.4s], not acquired",
acpi_ut_get_node_name(obj_desc->mutex.node)));
return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
}
/* Must have a valid thread ID */
if (!walk_state->thread) {
ACPI_ERROR((AE_INFO,
"Cannot release Mutex [%4.4s], null thread info",
acpi_ut_get_node_name(obj_desc->mutex.node)));
return_ACPI_STATUS(AE_AML_INTERNAL);
}
/*
* The Mutex is owned, but this thread must be the owner.
* Special case for Global Lock, any thread can release
*/
if ((owner_thread->thread_id != walk_state->thread->thread_id) &&
(obj_desc != acpi_gbl_global_lock_mutex)) {
ACPI_ERROR((AE_INFO,
"Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
(u32)walk_state->thread->thread_id,
acpi_ut_get_node_name(obj_desc->mutex.node),
(u32)owner_thread->thread_id));
return_ACPI_STATUS(AE_AML_NOT_OWNER);
}
/*
* The sync level of the mutex must be equal to the current sync level. In
* other words, the current level means that at least one mutex at that
* level is currently being held. Attempting to release a mutex of a
* different level can only mean that the mutex ordering rule is being
* violated. This behavior is clarified in ACPI 4.0 specification.
*/
if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) {
ACPI_ERROR((AE_INFO,
"Cannot release Mutex [%4.4s], SyncLevel mismatch: "
"mutex %u current %u",
acpi_ut_get_node_name(obj_desc->mutex.node),
obj_desc->mutex.sync_level,
walk_state->thread->current_sync_level));
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
}
/*
* Get the previous sync_level from the head of the acquired mutex list.
* This handles the case where several mutexes at the same level have been
* acquired, but are not released in reverse order.
*/
previous_sync_level =
owner_thread->acquired_mutex_list->mutex.original_sync_level;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
"Prev SyncLevel %u, Depth %u TID %p\n",
obj_desc->mutex.sync_level,
walk_state->thread->current_sync_level,
previous_sync_level,
obj_desc->mutex.acquisition_depth,
walk_state->thread));
status = acpi_ex_release_mutex_object(obj_desc);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
if (obj_desc->mutex.acquisition_depth == 0) {
/* Restore the previous sync_level */
owner_thread->current_sync_level = previous_sync_level;
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Released: Object SyncLevel %u, Thread SyncLevel, %u, "
"Prev SyncLevel %u, Depth %u\n",
obj_desc->mutex.sync_level,
walk_state->thread->current_sync_level,
previous_sync_level,
obj_desc->mutex.acquisition_depth));
return_ACPI_STATUS(status);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Robert Moore | 188 | 53.71% | 7 | 38.89% |
| Andy Grover | 46 | 13.14% | 2 | 11.11% |
| Linus Torvalds | 40 | 11.43% | 2 | 11.11% |
| Dan Carpenter | 32 | 9.14% | 1 | 5.56% |
| Lin Ming | 23 | 6.57% | 2 | 11.11% |
| Len Brown | 20 | 5.71% | 3 | 16.67% |
| Lv Zheng | 1 | 0.29% | 1 | 5.56% |
| Total | 350 | 100.00% | 18 | 100.00% |
/*******************************************************************************
*
* FUNCTION: acpi_ex_release_all_mutexes
*
* PARAMETERS: thread - Current executing thread object
*
* RETURN: Status
*
* DESCRIPTION: Release all mutexes held by this thread
*
* NOTE: This function is called as the thread is exiting the interpreter.
* Mutexes are not released when an individual control method is exited, but
* only when the parent thread actually exits the interpreter. This allows one
* method to acquire a mutex, and a different method to release it, as long as
* this is performed underneath a single parent control method.
*
******************************************************************************/
void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
{
union acpi_operand_object *next = thread->acquired_mutex_list;
union acpi_operand_object *obj_desc;
ACPI_FUNCTION_TRACE(ex_release_all_mutexes);
/* Traverse the list of owned mutexes, releasing each one */
while (next) {
obj_desc = next;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
obj_desc->mutex.node->name.ascii,
obj_desc->mutex.sync_level,
obj_desc->mutex.acquisition_depth));
/* Release the mutex, special case for Global Lock */
if (obj_desc == acpi_gbl_global_lock_mutex) {
/* Ignore errors */
(void)acpi_ev_release_global_lock();
} else {
acpi_os_release_mutex(obj_desc->mutex.os_mutex);
}
/* Update Thread sync_level (Last mutex is the important one) */
thread->current_sync_level =
obj_desc->mutex.original_sync_level;
/* Mark mutex unowned */
next = obj_desc->mutex.next;
obj_desc->mutex.prev = NULL;
obj_desc->mutex.next = NULL;
obj_desc->mutex.acquisition_depth = 0;
obj_desc->mutex.owner_thread = NULL;
obj_desc->mutex.thread_id = 0;
}
return_VOID;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Robert Moore | 100 | 62.11% | 4 | 28.57% |
| Linus Torvalds | 32 | 19.88% | 2 | 14.29% |
| Andy Grover | 19 | 11.80% | 4 | 28.57% |
| Len Brown | 9 | 5.59% | 3 | 21.43% |
| Lin Ming | 1 | 0.62% | 1 | 7.14% |
| Total | 161 | 100.00% | 14 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Robert Moore | 675 | 52.45% | 17 | 48.57% |
| Linus Torvalds | 325 | 25.25% | 2 | 5.71% |
| Andy Grover | 164 | 12.74% | 5 | 14.29% |
| Len Brown | 64 | 4.97% | 6 | 17.14% |
| Dan Carpenter | 32 | 2.49% | 1 | 2.86% |
| Lin Ming | 25 | 1.94% | 2 | 5.71% |
| Lv Zheng | 1 | 0.08% | 1 | 2.86% |
| Patrick Mochel | 1 | 0.08% | 1 | 2.86% |
| Total | 1287 | 100.00% | 35 | 100.00% |
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