379 lines
11 KiB
C
379 lines
11 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 - 2007, 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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#include <acpi/acevents.h>
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exmutex")
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/* Local prototypes */
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static void
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acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
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struct acpi_thread_state *thread);
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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: None
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*
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* DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
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*
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******************************************************************************/
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void acpi_ex_unlink_mutex(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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} 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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* Thread - Current executing thread object
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*
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* RETURN: None
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*
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* DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
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*
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******************************************************************************/
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static void
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acpi_ex_link_mutex(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 - Timeout integer
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* obj_desc - Mutex object
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* walk_state - Current method execution state
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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(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_ERROR((AE_INFO,
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"Cannot acquire Mutex [%4.4s], null thread info",
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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_ERROR((AE_INFO,
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"Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%d)",
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acpi_ut_get_node_name(obj_desc->mutex.node),
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walk_state->thread->current_sync_level));
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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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if (obj_desc->mutex.owner_thread->thread_id ==
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walk_state->thread->thread_id) {
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/*
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* The mutex is already owned by this thread, just increment the
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* 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. Special case for Global Lock */
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if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
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status =
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acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
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} else {
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status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
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(u16) time_desc->integer.
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value);
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}
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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 =
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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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* walk_state - Current method execution state
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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(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 = AE_OK;
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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_ERROR((AE_INFO,
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"Cannot release Mutex [%4.4s], not acquired",
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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_ERROR((AE_INFO,
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"Cannot release Mutex [%4.4s], null thread info",
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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 !=
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walk_state->thread->thread_id)
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&& (obj_desc->mutex.os_mutex != acpi_gbl_global_lock_mutex)) {
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ACPI_ERROR((AE_INFO,
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"Thread %lX cannot release Mutex [%4.4s] acquired by thread %lX",
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(unsigned long)walk_state->thread->thread_id,
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acpi_ut_get_node_name(obj_desc->mutex.node),
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(unsigned long)obj_desc->mutex.owner_thread->
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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 equal to the current
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* 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_ERROR((AE_INFO,
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"Cannot release Mutex [%4.4s], incorrect SyncLevel",
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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, special case for Global Lock */
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if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
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status = acpi_ev_release_global_lock();
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} else {
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acpi_os_release_mutex(obj_desc->mutex.os_mutex);
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}
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/* Update the mutex and restore sync_level */
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obj_desc->mutex.owner_thread = NULL;
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walk_state->thread->current_sync_level =
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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: Thread - Current executing thread object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release all mutexes held by this thread
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*
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* NOTE: This function is called as the thread is exiting the interpreter.
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* Mutexes are not released when an individual control method is exited, but
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* only when the parent thread actually exits the interpreter. This allows one
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* method to acquire a mutex, and a different method to release it, as long as
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* this is performed underneath a single parent control method.
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*
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******************************************************************************/
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void acpi_ex_release_all_mutexes(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 *obj_desc;
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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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obj_desc = next;
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next = obj_desc->mutex.next;
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obj_desc->mutex.prev = NULL;
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obj_desc->mutex.next = NULL;
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obj_desc->mutex.acquisition_depth = 0;
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/* Release the mutex, special case for Global Lock */
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if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
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/* Ignore errors */
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(void)acpi_ev_release_global_lock();
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} else {
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acpi_os_release_mutex(obj_desc->mutex.os_mutex);
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}
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/* Mark mutex unowned */
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obj_desc->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 =
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obj_desc->mutex.original_sync_level;
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}
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}
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