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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: utmutex - local mutex support
*
******************************************************************************/
#include <acpi/acpi.h>
#include "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 void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id);
/*******************************************************************************
*
* FUNCTION: acpi_ut_mutex_initialize
*
* PARAMETERS: None.
*
* RETURN: Status
*
* DESCRIPTION: Create the system mutex objects. This includes mutexes,
* spin locks, and reader/writer locks.
*
******************************************************************************/
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 or for speed */
status = acpi_os_create_lock (&acpi_gbl_gpe_lock);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_os_create_lock(&acpi_gbl_reference_count_lock);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Mutex for _OSI support */
status = acpi_os_create_mutex(&acpi_gbl_osi_mutex);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Create the reader/writer lock for namespace access */
status = acpi_ut_create_rw_lock(&acpi_gbl_namespace_rw_lock);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_mutex_terminate
*
* PARAMETERS: None.
*
* RETURN: None.
*
* DESCRIPTION: Delete all of the system mutex objects. This includes mutexes,
* spin locks, and reader/writer locks.
*
******************************************************************************/
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++) {
acpi_ut_delete_mutex(i);
}
acpi_os_delete_mutex(acpi_gbl_osi_mutex);
/* Delete the spinlocks */
acpi_os_delete_lock(acpi_gbl_gpe_lock);
acpi_os_delete_lock(acpi_gbl_hardware_lock);
acpi_os_delete_lock(acpi_gbl_reference_count_lock);
/* Delete the reader/writer lock */
acpi_ut_delete_rw_lock(&acpi_gbl_namespace_rw_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 (!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 void acpi_ut_delete_mutex(acpi_mutex_handle mutex_id)
{
ACPI_FUNCTION_TRACE_U32(ut_delete_mutex, mutex_id);
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_VOID;
}
/*******************************************************************************
*
* 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 [%u]",
acpi_ut_get_mutex_name
(mutex_id),
(u32)this_thread_id));
return (AE_ALREADY_ACQUIRED);
}
ACPI_ERROR((AE_INFO,
"Invalid acquire order: Thread %u owns [%s], wants [%s]",
(u32)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 %u attempting to acquire Mutex [%s]\n",
(u32)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 %u acquired Mutex [%s]\n",
(u32)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 %u could not acquire Mutex [%s] (0x%X)",
(u32)this_thread_id,
acpi_ut_get_mutex_name(mutex_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_FUNCTION_NAME(ut_release_mutex);
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Thread %u releasing Mutex [%s]\n",
(u32)acpi_os_get_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 [%s] (0x%X) is not acquired, cannot release",
acpi_ut_get_mutex_name(mutex_id), 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 ==
acpi_os_get_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);
}
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