349 lines
9.5 KiB
C
349 lines
9.5 KiB
C
/*******************************************************************************
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*
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* Module Name: utmutex - local mutex support
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2006, 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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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("utmutex")
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/* Local prototypes */
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static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id);
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static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_mutex_initialize
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*
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* PARAMETERS: None.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create the system mutex objects.
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*
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******************************************************************************/
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acpi_status acpi_ut_mutex_initialize(void)
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{
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u32 i;
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acpi_status status;
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ACPI_FUNCTION_TRACE("ut_mutex_initialize");
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/*
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* Create each of the predefined mutex objects
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*/
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for (i = 0; i < NUM_MUTEX; i++) {
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status = acpi_ut_create_mutex(i);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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status = acpi_os_create_lock(&acpi_gbl_gpe_lock);
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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_ut_mutex_terminate
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*
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* PARAMETERS: None.
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*
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* RETURN: None.
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*
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* DESCRIPTION: Delete all of the system mutex objects.
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*
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******************************************************************************/
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void acpi_ut_mutex_terminate(void)
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{
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u32 i;
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ACPI_FUNCTION_TRACE("ut_mutex_terminate");
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/*
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* Delete each predefined mutex object
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*/
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for (i = 0; i < NUM_MUTEX; i++) {
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(void)acpi_ut_delete_mutex(i);
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}
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acpi_os_delete_lock(acpi_gbl_gpe_lock);
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_create_mutex
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*
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* PARAMETERS: mutex_iD - ID of the mutex to be created
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a mutex object.
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*
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******************************************************************************/
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static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_U32("ut_create_mutex", mutex_id);
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if (mutex_id > MAX_MUTEX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (!acpi_gbl_mutex_info[mutex_id].mutex) {
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status = acpi_os_create_semaphore(1, 1,
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&acpi_gbl_mutex_info
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[mutex_id].mutex);
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acpi_gbl_mutex_info[mutex_id].thread_id =
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ACPI_MUTEX_NOT_ACQUIRED;
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acpi_gbl_mutex_info[mutex_id].use_count = 0;
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}
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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_ut_delete_mutex
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*
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* PARAMETERS: mutex_iD - ID of the mutex to be deleted
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*
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* RETURN: Status
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*
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* DESCRIPTION: Delete a mutex object.
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*
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******************************************************************************/
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static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_U32("ut_delete_mutex", mutex_id);
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if (mutex_id > MAX_MUTEX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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status = acpi_os_delete_semaphore(acpi_gbl_mutex_info[mutex_id].mutex);
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acpi_gbl_mutex_info[mutex_id].mutex = NULL;
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acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
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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_ut_acquire_mutex
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*
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* PARAMETERS: mutex_iD - ID of the mutex to be acquired
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*
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* RETURN: Status
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*
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* DESCRIPTION: Acquire a mutex object.
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*
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******************************************************************************/
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acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id)
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{
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acpi_status status;
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u32 this_thread_id;
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ACPI_FUNCTION_NAME("ut_acquire_mutex");
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if (mutex_id > MAX_MUTEX) {
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return (AE_BAD_PARAMETER);
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}
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this_thread_id = acpi_os_get_thread_id();
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#ifdef ACPI_MUTEX_DEBUG
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{
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u32 i;
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/*
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* Mutex debug code, for internal debugging only.
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*
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* Deadlock prevention. Check if this thread owns any mutexes of value
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* greater than or equal to this one. If so, the thread has violated
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* the mutex ordering rule. This indicates a coding error somewhere in
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* the ACPI subsystem code.
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*/
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for (i = mutex_id; i < MAX_MUTEX; i++) {
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if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
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if (i == mutex_id) {
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ACPI_ERROR((AE_INFO,
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"Mutex [%s] already acquired by this thread [%X]",
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acpi_ut_get_mutex_name
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(mutex_id),
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this_thread_id));
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return (AE_ALREADY_ACQUIRED);
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}
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ACPI_ERROR((AE_INFO,
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"Invalid acquire order: Thread %X owns [%s], wants [%s]",
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this_thread_id,
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acpi_ut_get_mutex_name(i),
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acpi_ut_get_mutex_name(mutex_id)));
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return (AE_ACQUIRE_DEADLOCK);
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}
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}
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}
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#endif
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ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
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"Thread %X attempting to acquire Mutex [%s]\n",
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this_thread_id, acpi_ut_get_mutex_name(mutex_id)));
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status = acpi_os_wait_semaphore(acpi_gbl_mutex_info[mutex_id].mutex,
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1, ACPI_WAIT_FOREVER);
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if (ACPI_SUCCESS(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
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"Thread %X acquired Mutex [%s]\n",
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this_thread_id,
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acpi_ut_get_mutex_name(mutex_id)));
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acpi_gbl_mutex_info[mutex_id].use_count++;
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acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id;
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} else {
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ACPI_EXCEPTION((AE_INFO, status,
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"Thread %X could not acquire Mutex [%X]",
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this_thread_id, mutex_id));
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}
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_release_mutex
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*
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* PARAMETERS: mutex_iD - ID of the mutex to be released
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release a mutex object.
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*
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******************************************************************************/
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acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id)
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{
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acpi_status status;
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u32 this_thread_id;
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ACPI_FUNCTION_NAME("ut_release_mutex");
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this_thread_id = acpi_os_get_thread_id();
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ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
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"Thread %X releasing Mutex [%s]\n", this_thread_id,
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acpi_ut_get_mutex_name(mutex_id)));
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if (mutex_id > MAX_MUTEX) {
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return (AE_BAD_PARAMETER);
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}
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/*
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* Mutex must be acquired in order to release it!
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*/
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if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) {
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ACPI_ERROR((AE_INFO,
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"Mutex [%X] is not acquired, cannot release",
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mutex_id));
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return (AE_NOT_ACQUIRED);
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}
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#ifdef ACPI_MUTEX_DEBUG
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{
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u32 i;
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/*
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* Mutex debug code, for internal debugging only.
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*
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* Deadlock prevention. Check if this thread owns any mutexes of value
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* greater than this one. If so, the thread has violated the mutex
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* ordering rule. This indicates a coding error somewhere in
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* the ACPI subsystem code.
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*/
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for (i = mutex_id; i < MAX_MUTEX; i++) {
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if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) {
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if (i == mutex_id) {
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continue;
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}
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ACPI_ERROR((AE_INFO,
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"Invalid release order: owns [%s], releasing [%s]",
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acpi_ut_get_mutex_name(i),
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acpi_ut_get_mutex_name(mutex_id)));
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return (AE_RELEASE_DEADLOCK);
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}
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}
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}
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#endif
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/* Mark unlocked FIRST */
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acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED;
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status =
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acpi_os_signal_semaphore(acpi_gbl_mutex_info[mutex_id].mutex, 1);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Thread %X could not release Mutex [%X]",
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this_thread_id, mutex_id));
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
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"Thread %X released Mutex [%s]\n",
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this_thread_id,
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acpi_ut_get_mutex_name(mutex_id)));
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}
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return (status);
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}
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