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Diffstat (limited to 'drivers/acpi/acpica/utmutex.c')
| -rw-r--r-- | drivers/acpi/acpica/utmutex.c | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c new file mode 100644 index 000000000000..7b48ba3f3f8a --- /dev/null +++ b/drivers/acpi/acpica/utmutex.c @@ -0,0 +1,342 @@ +/******************************************************************************* + * + * Module Name: utmutex - local mutex support + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#include <acpi/acpi.h> +#include <acpi/accommon.h> + +#define _COMPONENT ACPI_UTILITIES +ACPI_MODULE_NAME("utmutex") + +/* Local prototypes */ +static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id); + +static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id); + +/******************************************************************************* + * + * FUNCTION: acpi_ut_mutex_initialize + * + * PARAMETERS: None. + * + * RETURN: Status + * + * DESCRIPTION: Create the system mutex objects. + * + ******************************************************************************/ + +acpi_status acpi_ut_mutex_initialize(void) +{ + u32 i; + acpi_status status; + + ACPI_FUNCTION_TRACE(ut_mutex_initialize); + + /* + * Create each of the predefined mutex objects + */ + for (i = 0; i < ACPI_NUM_MUTEX; i++) { + status = acpi_ut_create_mutex(i); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + } + + /* Create the spinlocks for use at interrupt level */ + + spin_lock_init(acpi_gbl_gpe_lock); + spin_lock_init(acpi_gbl_hardware_lock); + + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_mutex_terminate + * + * PARAMETERS: None. + * + * RETURN: None. + * + * DESCRIPTION: Delete all of the system mutex objects. + * + ******************************************************************************/ + +void acpi_ut_mutex_terminate(void) +{ + u32 i; + + ACPI_FUNCTION_TRACE(ut_mutex_terminate); + + /* + * Delete each predefined mutex object + */ + for (i = 0; i < ACPI_NUM_MUTEX; i++) { + (void)acpi_ut_delete_mutex(i); + } + + /* Delete the spinlocks */ + + acpi_os_delete_lock(acpi_gbl_gpe_lock); + acpi_os_delete_lock(acpi_gbl_hardware_lock); + return_VOID; +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_create_mutex + * + * PARAMETERS: mutex_iD - ID of the mutex to be created + * + * RETURN: Status + * + * DESCRIPTION: Create a mutex object. + * + ******************************************************************************/ + +static acpi_status acpi_ut_create_mutex(acpi_mutex_handle mutex_id) +{ + acpi_status status = AE_OK; + + ACPI_FUNCTION_TRACE_U32(ut_create_mutex, mutex_id); + + if (mutex_id > ACPI_MAX_MUTEX) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + if (!acpi_gbl_mutex_info[mutex_id].mutex) { + status = + acpi_os_create_mutex(&acpi_gbl_mutex_info[mutex_id].mutex); + acpi_gbl_mutex_info[mutex_id].thread_id = + ACPI_MUTEX_NOT_ACQUIRED; + acpi_gbl_mutex_info[mutex_id].use_count = 0; + } + + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_delete_mutex + * + * PARAMETERS: mutex_iD - ID of the mutex to be deleted + * + * RETURN: Status + * + * DESCRIPTION: Delete a mutex object. + * + ******************************************************************************/ + +static acpi_status acpi_ut_delete_mutex(acpi_mutex_handle mutex_id) +{ + + ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id); + + if (mutex_id > ACPI_MAX_MUTEX) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + acpi_os_delete_mutex(acpi_gbl_mutex_info[mutex_id].mutex); + + acpi_gbl_mutex_info[mutex_id].mutex = NULL; + acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED; + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_acquire_mutex + * + * PARAMETERS: mutex_iD - ID of the mutex to be acquired + * + * RETURN: Status + * + * DESCRIPTION: Acquire a mutex object. + * + ******************************************************************************/ + +acpi_status acpi_ut_acquire_mutex(acpi_mutex_handle mutex_id) +{ + acpi_status status; + acpi_thread_id this_thread_id; + + ACPI_FUNCTION_NAME(ut_acquire_mutex); + + if (mutex_id > ACPI_MAX_MUTEX) { + return (AE_BAD_PARAMETER); + } + + this_thread_id = acpi_os_get_thread_id(); + +#ifdef ACPI_MUTEX_DEBUG + { + u32 i; + /* + * Mutex debug code, for internal debugging only. + * + * Deadlock prevention. Check if this thread owns any mutexes of value + * greater than or equal to this one. If so, the thread has violated + * the mutex ordering rule. This indicates a coding error somewhere in + * the ACPI subsystem code. + */ + for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) { + if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) { + if (i == mutex_id) { + ACPI_ERROR((AE_INFO, + "Mutex [%s] already acquired by this thread [%X]", + acpi_ut_get_mutex_name + (mutex_id), + this_thread_id)); + + return (AE_ALREADY_ACQUIRED); + } + + ACPI_ERROR((AE_INFO, + "Invalid acquire order: Thread %X owns [%s], wants [%s]", + this_thread_id, + acpi_ut_get_mutex_name(i), + acpi_ut_get_mutex_name(mutex_id))); + + return (AE_ACQUIRE_DEADLOCK); + } + } + } +#endif + + ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, + "Thread %lX attempting to acquire Mutex [%s]\n", + (unsigned long)this_thread_id, + acpi_ut_get_mutex_name(mutex_id))); + + status = acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex, + ACPI_WAIT_FOREVER); + if (ACPI_SUCCESS(status)) { + ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, + "Thread %lX acquired Mutex [%s]\n", + (unsigned long)this_thread_id, + acpi_ut_get_mutex_name(mutex_id))); + + acpi_gbl_mutex_info[mutex_id].use_count++; + acpi_gbl_mutex_info[mutex_id].thread_id = this_thread_id; + } else { + ACPI_EXCEPTION((AE_INFO, status, + "Thread %lX could not acquire Mutex [%X]", + (unsigned long)this_thread_id, mutex_id)); + } + + return (status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_release_mutex + * + * PARAMETERS: mutex_iD - ID of the mutex to be released + * + * RETURN: Status + * + * DESCRIPTION: Release a mutex object. + * + ******************************************************************************/ + +acpi_status acpi_ut_release_mutex(acpi_mutex_handle mutex_id) +{ + acpi_thread_id this_thread_id; + + ACPI_FUNCTION_NAME(ut_release_mutex); + + this_thread_id = acpi_os_get_thread_id(); + ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, + "Thread %lX releasing Mutex [%s]\n", + (unsigned long)this_thread_id, + acpi_ut_get_mutex_name(mutex_id))); + + if (mutex_id > ACPI_MAX_MUTEX) { + return (AE_BAD_PARAMETER); + } + + /* + * Mutex must be acquired in order to release it! + */ + if (acpi_gbl_mutex_info[mutex_id].thread_id == ACPI_MUTEX_NOT_ACQUIRED) { + ACPI_ERROR((AE_INFO, + "Mutex [%X] is not acquired, cannot release", + mutex_id)); + + return (AE_NOT_ACQUIRED); + } +#ifdef ACPI_MUTEX_DEBUG + { + u32 i; + /* + * Mutex debug code, for internal debugging only. + * + * Deadlock prevention. Check if this thread owns any mutexes of value + * greater than this one. If so, the thread has violated the mutex + * ordering rule. This indicates a coding error somewhere in + * the ACPI subsystem code. + */ + for (i = mutex_id; i < ACPI_NUM_MUTEX; i++) { + if (acpi_gbl_mutex_info[i].thread_id == this_thread_id) { + if (i == mutex_id) { + continue; + } + + ACPI_ERROR((AE_INFO, + "Invalid release order: owns [%s], releasing [%s]", + acpi_ut_get_mutex_name(i), + acpi_ut_get_mutex_name(mutex_id))); + + return (AE_RELEASE_DEADLOCK); + } + } + } +#endif + + /* Mark unlocked FIRST */ + + acpi_gbl_mutex_info[mutex_id].thread_id = ACPI_MUTEX_NOT_ACQUIRED; + + acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex); + return (AE_OK); +} |