364 lines
10 KiB
C
364 lines
10 KiB
C
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/******************************************************************************
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*
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* Module Name: exmutex - ASL Mutex Acquire/Release functions
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acinterp.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME ("exmutex")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_unlink_mutex
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*
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* PARAMETERS: obj_desc - The mutex to be unlinked
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*
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* RETURN: Status
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*
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* DESCRIPTION: Remove a mutex from the "acquired_mutex" list
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*
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******************************************************************************/
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void
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acpi_ex_unlink_mutex (
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union acpi_operand_object *obj_desc)
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{
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struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
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if (!thread) {
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return;
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}
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/* Doubly linked list */
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if (obj_desc->mutex.next) {
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(obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
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}
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if (obj_desc->mutex.prev) {
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(obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
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}
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else {
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thread->acquired_mutex_list = obj_desc->mutex.next;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_link_mutex
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*
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* PARAMETERS: obj_desc - The mutex to be linked
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* list_head - head of the "acquired_mutex" list
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*
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* RETURN: Status
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*
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* DESCRIPTION: Add a mutex to the "acquired_mutex" list for this walk
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*
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******************************************************************************/
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void
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acpi_ex_link_mutex (
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union acpi_operand_object *obj_desc,
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struct acpi_thread_state *thread)
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{
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union acpi_operand_object *list_head;
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list_head = thread->acquired_mutex_list;
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/* This object will be the first object in the list */
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obj_desc->mutex.prev = NULL;
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obj_desc->mutex.next = list_head;
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/* Update old first object to point back to this object */
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if (list_head) {
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list_head->mutex.prev = obj_desc;
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}
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/* Update list head */
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thread->acquired_mutex_list = obj_desc;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_acquire_mutex
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*
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* PARAMETERS: time_desc - The 'time to delay' object descriptor
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* obj_desc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Acquire an AML mutex
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*
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******************************************************************************/
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acpi_status
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acpi_ex_acquire_mutex (
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union acpi_operand_object *time_desc,
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union acpi_operand_object *obj_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR ("ex_acquire_mutex", obj_desc);
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if (!obj_desc) {
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* Sanity check -- we must have a valid thread ID */
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if (!walk_state->thread) {
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ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n",
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acpi_ut_get_node_name (obj_desc->mutex.node)));
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return_ACPI_STATUS (AE_AML_INTERNAL);
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}
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/*
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* Current Sync must be less than or equal to the sync level of the
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* mutex. This mechanism provides some deadlock prevention
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*/
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if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
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ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect sync_level\n",
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acpi_ut_get_node_name (obj_desc->mutex.node)));
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return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
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}
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/* Support for multiple acquires by the owning thread */
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if (obj_desc->mutex.owner_thread) {
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/* Special case for Global Lock, allow all threads */
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if ((obj_desc->mutex.owner_thread->thread_id == walk_state->thread->thread_id) ||
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(obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore)) {
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/*
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* The mutex is already owned by this thread,
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* just increment the acquisition depth
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*/
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obj_desc->mutex.acquisition_depth++;
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return_ACPI_STATUS (AE_OK);
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}
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}
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/* Acquire the mutex, wait if necessary */
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status = acpi_ex_system_acquire_mutex (time_desc, obj_desc);
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if (ACPI_FAILURE (status)) {
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/* Includes failure from a timeout on time_desc */
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return_ACPI_STATUS (status);
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}
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/* Have the mutex: update mutex and walk info and save the sync_level */
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obj_desc->mutex.owner_thread = walk_state->thread;
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obj_desc->mutex.acquisition_depth = 1;
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obj_desc->mutex.original_sync_level = walk_state->thread->current_sync_level;
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walk_state->thread->current_sync_level = obj_desc->mutex.sync_level;
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/* Link the mutex to the current thread for force-unlock at method exit */
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acpi_ex_link_mutex (obj_desc, walk_state->thread);
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return_ACPI_STATUS (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_release_mutex
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*
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* PARAMETERS: obj_desc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release a previously acquired Mutex.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_release_mutex (
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union acpi_operand_object *obj_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE ("ex_release_mutex");
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if (!obj_desc) {
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return_ACPI_STATUS (AE_BAD_PARAMETER);
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}
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/* The mutex must have been previously acquired in order to release it */
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if (!obj_desc->mutex.owner_thread) {
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ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n",
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acpi_ut_get_node_name (obj_desc->mutex.node)));
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return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
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}
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/* Sanity check -- we must have a valid thread ID */
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if (!walk_state->thread) {
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ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n",
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acpi_ut_get_node_name (obj_desc->mutex.node)));
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return_ACPI_STATUS (AE_AML_INTERNAL);
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}
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/*
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* The Mutex is owned, but this thread must be the owner.
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* Special case for Global Lock, any thread can release
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*/
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if ((obj_desc->mutex.owner_thread->thread_id != walk_state->thread->thread_id) &&
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(obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) {
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ACPI_REPORT_ERROR ((
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"Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n",
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walk_state->thread->thread_id,
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acpi_ut_get_node_name (obj_desc->mutex.node),
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obj_desc->mutex.owner_thread->thread_id));
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return_ACPI_STATUS (AE_AML_NOT_OWNER);
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}
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/*
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* The sync level of the mutex must be less than or
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* equal to the current sync level
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*/
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if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
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ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect sync_level\n",
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acpi_ut_get_node_name (obj_desc->mutex.node)));
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return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
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}
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/* Match multiple Acquires with multiple Releases */
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obj_desc->mutex.acquisition_depth--;
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if (obj_desc->mutex.acquisition_depth != 0) {
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/* Just decrement the depth and return */
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return_ACPI_STATUS (AE_OK);
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}
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/* Unlink the mutex from the owner's list */
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acpi_ex_unlink_mutex (obj_desc);
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/* Release the mutex */
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status = acpi_ex_system_release_mutex (obj_desc);
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/* Update the mutex and walk state, restore sync_level before acquire */
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obj_desc->mutex.owner_thread = NULL;
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walk_state->thread->current_sync_level = obj_desc->mutex.original_sync_level;
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return_ACPI_STATUS (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_release_all_mutexes
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*
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* PARAMETERS: mutex_list - Head of the mutex list
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release all mutexes in the list
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*
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******************************************************************************/
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void
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acpi_ex_release_all_mutexes (
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struct acpi_thread_state *thread)
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{
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union acpi_operand_object *next = thread->acquired_mutex_list;
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union acpi_operand_object *this;
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acpi_status status;
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ACPI_FUNCTION_ENTRY ();
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/* Traverse the list of owned mutexes, releasing each one */
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while (next) {
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this = next;
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next = this->mutex.next;
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this->mutex.acquisition_depth = 1;
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this->mutex.prev = NULL;
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this->mutex.next = NULL;
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/* Release the mutex */
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status = acpi_ex_system_release_mutex (this);
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if (ACPI_FAILURE (status)) {
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continue;
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}
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/* Mark mutex unowned */
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this->mutex.owner_thread = NULL;
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/* Update Thread sync_level (Last mutex is the important one) */
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thread->current_sync_level = this->mutex.original_sync_level;
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}
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}
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