331 lines
8.4 KiB
C
331 lines
8.4 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/*******************************************************************************
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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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#include <acpi/acpi.h>
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#include "accommon.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 void 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. This includes mutexes,
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* spin locks, and reader/writer locks.
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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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/* Create each of the predefined mutex objects */
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for (i = 0; i < ACPI_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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/* Create the spinlocks for use at interrupt level or for speed */
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status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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status = acpi_os_create_raw_lock(&acpi_gbl_hardware_lock);
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if (ACPI_FAILURE (status)) {
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return_ACPI_STATUS (status);
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}
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status = acpi_os_create_lock(&acpi_gbl_reference_count_lock);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Mutex for _OSI support */
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status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Create the reader/writer lock for namespace access */
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status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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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_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. This includes mutexes,
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* spin locks, and reader/writer locks.
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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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/* Delete each predefined mutex object */
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for (i = 0; i < ACPI_NUM_MUTEX; i++) {
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acpi_ut_delete_mutex(i);
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}
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acpi_os_delete_mutex(acpi_gbl_osi_mutex);
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/* Delete the spinlocks */
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acpi_os_delete_lock(acpi_gbl_gpe_lock);
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acpi_os_delete_raw_lock(acpi_gbl_hardware_lock);
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acpi_os_delete_lock(acpi_gbl_reference_count_lock);
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/* Delete the reader/writer lock */
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acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_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 (!acpi_gbl_mutex_info[mutex_id].mutex) {
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status =
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acpi_os_create_mutex(&acpi_gbl_mutex_info[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 void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
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{
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ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
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acpi_os_delete_mutex(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_VOID;
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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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acpi_thread_id this_thread_id;
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ACPI_FUNCTION_NAME(ut_acquire_mutex);
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if (mutex_id > ACPI_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 < ACPI_NUM_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 [%u]",
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acpi_ut_get_mutex_name
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(mutex_id),
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(u32)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 %u owns [%s], wants [%s]",
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(u32)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 %u attempting to acquire Mutex [%s]\n",
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(u32)this_thread_id,
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acpi_ut_get_mutex_name(mutex_id)));
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status =
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acpi_os_acquire_mutex(acpi_gbl_mutex_info[mutex_id].mutex,
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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 %u acquired Mutex [%s]\n",
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(u32)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 %u could not acquire Mutex [%s] (0x%X)",
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(u32)this_thread_id,
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acpi_ut_get_mutex_name(mutex_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_FUNCTION_NAME(ut_release_mutex);
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ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
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(u32)acpi_os_get_thread_id(),
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acpi_ut_get_mutex_name(mutex_id)));
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if (mutex_id > ACPI_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 [%s] (0x%X) is not acquired, cannot release",
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acpi_ut_get_mutex_name(mutex_id), 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 < ACPI_NUM_MUTEX; i++) {
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if (acpi_gbl_mutex_info[i].thread_id ==
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acpi_os_get_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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acpi_os_release_mutex(acpi_gbl_mutex_info[mutex_id].mutex);
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return (AE_OK);
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}
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