mirror of https://gitee.com/openkylin/linux.git
364 lines
10 KiB
C
364 lines
10 KiB
C
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: exmutex - ASL Mutex Acquire/Release functions
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2005, R. Byron Moore
|
|
* 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 <acpi/acinterp.h>
|
|
|
|
#define _COMPONENT ACPI_EXECUTER
|
|
ACPI_MODULE_NAME ("exmutex")
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_unlink_mutex
|
|
*
|
|
* PARAMETERS: obj_desc - The mutex to be unlinked
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Remove a mutex from the "acquired_mutex" 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;
|
|
}
|
|
else {
|
|
thread->acquired_mutex_list = obj_desc->mutex.next;
|
|
}
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_link_mutex
|
|
*
|
|
* PARAMETERS: obj_desc - The mutex to be linked
|
|
* list_head - head of the "acquired_mutex" list
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Add a mutex to the "acquired_mutex" list for this walk
|
|
*
|
|
******************************************************************************/
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_acquire_mutex
|
|
*
|
|
* PARAMETERS: time_desc - The 'time to delay' object descriptor
|
|
* obj_desc - The object descriptor for this op
|
|
*
|
|
* 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);
|
|
}
|
|
|
|
/* Sanity check -- we must have a valid thread ID */
|
|
|
|
if (!walk_state->thread) {
|
|
ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n",
|
|
acpi_ut_get_node_name (obj_desc->mutex.node)));
|
|
return_ACPI_STATUS (AE_AML_INTERNAL);
|
|
}
|
|
|
|
/*
|
|
* Current Sync 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_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect sync_level\n",
|
|
acpi_ut_get_node_name (obj_desc->mutex.node)));
|
|
return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
|
|
}
|
|
|
|
/* Support for multiple acquires by the owning thread */
|
|
|
|
if (obj_desc->mutex.owner_thread) {
|
|
/* Special case for Global Lock, allow all threads */
|
|
|
|
if ((obj_desc->mutex.owner_thread->thread_id == walk_state->thread->thread_id) ||
|
|
(obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore)) {
|
|
/*
|
|
* 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 */
|
|
|
|
status = acpi_ex_system_acquire_mutex (time_desc, obj_desc);
|
|
if (ACPI_FAILURE (status)) {
|
|
/* Includes failure from a timeout on time_desc */
|
|
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
/* Have the mutex: update mutex and walk info and save the sync_level */
|
|
|
|
obj_desc->mutex.owner_thread = walk_state->thread;
|
|
obj_desc->mutex.acquisition_depth = 1;
|
|
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);
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_release_mutex
|
|
*
|
|
* PARAMETERS: obj_desc - The object descriptor for this op
|
|
*
|
|
* 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)
|
|
{
|
|
acpi_status status;
|
|
|
|
|
|
ACPI_FUNCTION_TRACE ("ex_release_mutex");
|
|
|
|
|
|
if (!obj_desc) {
|
|
return_ACPI_STATUS (AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/* The mutex must have been previously acquired in order to release it */
|
|
|
|
if (!obj_desc->mutex.owner_thread) {
|
|
ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n",
|
|
acpi_ut_get_node_name (obj_desc->mutex.node)));
|
|
return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
|
|
}
|
|
|
|
/* Sanity check -- we must have a valid thread ID */
|
|
|
|
if (!walk_state->thread) {
|
|
ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n",
|
|
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 ((obj_desc->mutex.owner_thread->thread_id != walk_state->thread->thread_id) &&
|
|
(obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) {
|
|
ACPI_REPORT_ERROR ((
|
|
"Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n",
|
|
walk_state->thread->thread_id,
|
|
acpi_ut_get_node_name (obj_desc->mutex.node),
|
|
obj_desc->mutex.owner_thread->thread_id));
|
|
return_ACPI_STATUS (AE_AML_NOT_OWNER);
|
|
}
|
|
|
|
/*
|
|
* The sync level of the mutex must be less than or
|
|
* equal to the current sync level
|
|
*/
|
|
if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
|
|
ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect sync_level\n",
|
|
acpi_ut_get_node_name (obj_desc->mutex.node)));
|
|
return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* Unlink the mutex from the owner's list */
|
|
|
|
acpi_ex_unlink_mutex (obj_desc);
|
|
|
|
/* Release the mutex */
|
|
|
|
status = acpi_ex_system_release_mutex (obj_desc);
|
|
|
|
/* Update the mutex and walk state, restore sync_level before acquire */
|
|
|
|
obj_desc->mutex.owner_thread = NULL;
|
|
walk_state->thread->current_sync_level = obj_desc->mutex.original_sync_level;
|
|
|
|
return_ACPI_STATUS (status);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_release_all_mutexes
|
|
*
|
|
* PARAMETERS: mutex_list - Head of the mutex list
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Release all mutexes in the list
|
|
*
|
|
******************************************************************************/
|
|
|
|
void
|
|
acpi_ex_release_all_mutexes (
|
|
struct acpi_thread_state *thread)
|
|
{
|
|
union acpi_operand_object *next = thread->acquired_mutex_list;
|
|
union acpi_operand_object *this;
|
|
acpi_status status;
|
|
|
|
|
|
ACPI_FUNCTION_ENTRY ();
|
|
|
|
|
|
/* Traverse the list of owned mutexes, releasing each one */
|
|
|
|
while (next) {
|
|
this = next;
|
|
next = this->mutex.next;
|
|
|
|
this->mutex.acquisition_depth = 1;
|
|
this->mutex.prev = NULL;
|
|
this->mutex.next = NULL;
|
|
|
|
/* Release the mutex */
|
|
|
|
status = acpi_ex_system_release_mutex (this);
|
|
if (ACPI_FAILURE (status)) {
|
|
continue;
|
|
}
|
|
|
|
/* Mark mutex unowned */
|
|
|
|
this->mutex.owner_thread = NULL;
|
|
|
|
/* Update Thread sync_level (Last mutex is the important one) */
|
|
|
|
thread->current_sync_level = this->mutex.original_sync_level;
|
|
}
|
|
}
|
|
|
|
|