f9f4601f33
The use of the CPU stack in the debug version of the subsystem has been considerably reduced. Previously, a debug structure was declared in every function that used the debug macros. This structure has been removed in favor of declaring the individual elements as parameters to the debug functions. This reduces the cumulative stack use during nested execution of ACPI function calls at the cost of a small increase in the code size of the debug version of the subsystem. With assistance from Alexey Starikovskiy and Len Brown. Added the ACPI_GET_FUNCTION_NAME macro to enable the compiler-dependent headers to define a macro that will return the current function name at runtime (such as __FUNCTION__ or _func_, etc.) The function name is used by the debug trace output. If ACPI_GET_FUNCTION_NAME is not defined in the compiler-dependent header, the function name is saved on the CPU stack (one pointer per function.) This mechanism is used because apparently there exists no standard ANSI-C defined macro that that returns the function name. Alexey Starikovskiy redesigned and reimplemented the "Owner ID" mechanism used to track namespace objects created/deleted by ACPI tables and control method execution. A bitmap is now used to allocate and free the IDs, thus solving the wraparound problem present in the previous implementation. The size of the namespace node descriptor was reduced by 2 bytes as a result. Removed the UINT32_BIT and UINT16_BIT types that were used for the bitfield flag definitions within the headers for the predefined ACPI tables. These have been replaced by UINT8_BIT in order to increase the code portability of the subsystem. If the use of UINT8 remains a problem, we may be forced to eliminate bitfields entirely because of a lack of portability. Alexey Starikovksiy enhanced the performance of acpi_ut_update_object_reference. This is a frequently used function and this improvement increases the performance of the entire subsystem. Alexey Starikovskiy fixed several possible memory leaks and the inverse - premature object deletion. Signed-off-by: Len Brown <len.brown@intel.com>
381 lines
10 KiB
C
381 lines
10 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 - 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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#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
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acpi_ut_create_mutex (
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acpi_mutex_handle mutex_id);
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static acpi_status
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acpi_ut_delete_mutex (
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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
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acpi_ut_mutex_initialize (
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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
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acpi_ut_mutex_terminate (
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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
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acpi_ut_create_mutex (
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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[mutex_id].mutex);
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acpi_gbl_mutex_info[mutex_id].thread_id = 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
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acpi_ut_delete_mutex (
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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
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acpi_ut_acquire_mutex (
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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].owner_id == this_thread_id) {
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if (i == mutex_id) {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Mutex [%s] already acquired by this thread [%X]\n",
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acpi_ut_get_mutex_name (mutex_id), this_thread_id));
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return (AE_ALREADY_ACQUIRED);
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}
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Invalid acquire order: Thread %X owns [%s], wants [%s]\n",
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this_thread_id, 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, "Thread %X acquired Mutex [%s]\n",
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this_thread_id, 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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}
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else {
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ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Thread %X could not acquire Mutex [%s] %s\n",
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this_thread_id, acpi_ut_get_mutex_name (mutex_id),
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acpi_format_exception (status)));
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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
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acpi_ut_release_mutex (
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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_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Mutex [%s] is not acquired, cannot release\n",
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acpi_ut_get_mutex_name (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].owner_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_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Invalid release order: owns [%s], releasing [%s]\n",
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acpi_ut_get_mutex_name (i), 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 = 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_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Thread %X could not release Mutex [%s] %s\n",
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this_thread_id, acpi_ut_get_mutex_name (mutex_id),
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acpi_format_exception (status)));
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}
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else {
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ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Thread %X released Mutex [%s]\n",
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this_thread_id, 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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