507 lines
15 KiB
C
507 lines
15 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exmutex - ASL Mutex Acquire/Release functions
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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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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#include "acinterp.h"
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#include "acevents.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exmutex")
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/* Local prototypes */
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static void
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acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
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struct acpi_thread_state *thread);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_unlink_mutex
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*
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* PARAMETERS: obj_desc - The mutex to be unlinked
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*
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* RETURN: None
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*
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* DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
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*
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******************************************************************************/
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void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
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{
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struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;
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if (!thread) {
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return;
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}
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/* Doubly linked list */
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if (obj_desc->mutex.next) {
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(obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
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}
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if (obj_desc->mutex.prev) {
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(obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;
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/*
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* Migrate the previous sync level associated with this mutex to
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* the previous mutex on the list so that it may be preserved.
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* This handles the case where several mutexes have been acquired
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* at the same level, but are not released in opposite order.
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*/
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(obj_desc->mutex.prev)->mutex.original_sync_level =
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obj_desc->mutex.original_sync_level;
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} else {
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thread->acquired_mutex_list = obj_desc->mutex.next;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_link_mutex
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*
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* PARAMETERS: obj_desc - The mutex to be linked
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* thread - Current executing thread object
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*
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* RETURN: None
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*
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* DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
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*
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******************************************************************************/
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static void
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acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
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struct acpi_thread_state *thread)
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{
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union acpi_operand_object *list_head;
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list_head = thread->acquired_mutex_list;
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/* This object will be the first object in the list */
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obj_desc->mutex.prev = NULL;
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obj_desc->mutex.next = list_head;
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/* Update old first object to point back to this object */
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if (list_head) {
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list_head->mutex.prev = obj_desc;
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}
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/* Update list head */
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thread->acquired_mutex_list = obj_desc;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_acquire_mutex_object
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*
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* PARAMETERS: timeout - Timeout in milliseconds
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* obj_desc - Mutex object
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* thread_id - Current thread state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
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* path that supports multiple acquires by the same thread.
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*
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* MUTEX: Interpreter must be locked
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*
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* NOTE: This interface is called from three places:
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* 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator
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* 2) From acpi_ex_acquire_global_lock when an AML Field access requires the
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* global lock
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* 3) From the external interface, acpi_acquire_global_lock
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*
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******************************************************************************/
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acpi_status
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acpi_ex_acquire_mutex_object(u16 timeout,
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union acpi_operand_object *obj_desc,
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acpi_thread_id thread_id)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Support for multiple acquires by the owning thread */
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if (obj_desc->mutex.thread_id == thread_id) {
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/*
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* The mutex is already owned by this thread, just increment the
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* acquisition depth
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*/
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obj_desc->mutex.acquisition_depth++;
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return_ACPI_STATUS(AE_OK);
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}
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/* Acquire the mutex, wait if necessary. Special case for Global Lock */
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if (obj_desc == acpi_gbl_global_lock_mutex) {
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status = acpi_ev_acquire_global_lock(timeout);
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} else {
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status =
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acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
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timeout);
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}
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if (ACPI_FAILURE(status)) {
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/* Includes failure from a timeout on time_desc */
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return_ACPI_STATUS(status);
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}
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/* Acquired the mutex: update mutex object */
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obj_desc->mutex.thread_id = thread_id;
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obj_desc->mutex.acquisition_depth = 1;
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obj_desc->mutex.original_sync_level = 0;
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obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_acquire_mutex
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*
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* PARAMETERS: time_desc - Timeout integer
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* obj_desc - Mutex object
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* walk_state - Current method execution state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Acquire an AML mutex
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*
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******************************************************************************/
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acpi_status
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acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
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union acpi_operand_object *obj_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Must have a valid thread state struct */
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if (!walk_state->thread) {
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ACPI_ERROR((AE_INFO,
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"Cannot acquire Mutex [%4.4s], null thread info",
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acpi_ut_get_node_name(obj_desc->mutex.node)));
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return_ACPI_STATUS(AE_AML_INTERNAL);
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}
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/*
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* Current sync level must be less than or equal to the sync level
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* of the mutex. This mechanism provides some deadlock prevention.
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*/
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if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
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ACPI_ERROR((AE_INFO,
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"Cannot acquire Mutex [%4.4s], "
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"current SyncLevel is too large (%u)",
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acpi_ut_get_node_name(obj_desc->mutex.node),
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walk_state->thread->current_sync_level));
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return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
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"Depth %u TID %p\n",
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obj_desc->mutex.sync_level,
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walk_state->thread->current_sync_level,
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obj_desc->mutex.acquisition_depth,
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walk_state->thread));
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status = acpi_ex_acquire_mutex_object((u16)time_desc->integer.value,
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obj_desc,
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walk_state->thread->thread_id);
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if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {
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/* Save Thread object, original/current sync levels */
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obj_desc->mutex.owner_thread = walk_state->thread;
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obj_desc->mutex.original_sync_level =
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walk_state->thread->current_sync_level;
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walk_state->thread->current_sync_level =
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obj_desc->mutex.sync_level;
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/* Link the mutex to the current thread for force-unlock at method exit */
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acpi_ex_link_mutex(obj_desc, walk_state->thread);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
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obj_desc->mutex.sync_level,
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walk_state->thread->current_sync_level,
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obj_desc->mutex.acquisition_depth));
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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_ex_release_mutex_object
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*
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* PARAMETERS: obj_desc - The object descriptor for this op
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release a previously acquired Mutex, low level interface.
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* Provides a common path that supports multiple releases (after
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* previous multiple acquires) by the same thread.
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*
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* MUTEX: Interpreter must be locked
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*
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* NOTE: This interface is called from three places:
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* 1) From acpi_ex_release_mutex, via an AML Acquire() operator
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* 2) From acpi_ex_release_global_lock when an AML Field access requires the
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* global lock
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* 3) From the external interface, acpi_release_global_lock
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*
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******************************************************************************/
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acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ex_release_mutex_object);
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if (obj_desc->mutex.acquisition_depth == 0) {
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return_ACPI_STATUS(AE_NOT_ACQUIRED);
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}
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/* Match multiple Acquires with multiple Releases */
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obj_desc->mutex.acquisition_depth--;
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if (obj_desc->mutex.acquisition_depth != 0) {
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/* Just decrement the depth and return */
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return_ACPI_STATUS(AE_OK);
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}
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if (obj_desc->mutex.owner_thread) {
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/* Unlink the mutex from the owner's list */
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acpi_ex_unlink_mutex(obj_desc);
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obj_desc->mutex.owner_thread = NULL;
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}
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/* Release the mutex, special case for Global Lock */
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if (obj_desc == acpi_gbl_global_lock_mutex) {
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status = acpi_ev_release_global_lock();
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} else {
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acpi_os_release_mutex(obj_desc->mutex.os_mutex);
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}
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/* Clear mutex info */
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obj_desc->mutex.thread_id = 0;
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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_ex_release_mutex
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*
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* PARAMETERS: obj_desc - The object descriptor for this op
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* walk_state - Current method execution state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release a previously acquired Mutex.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
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struct acpi_walk_state *walk_state)
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{
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u8 previous_sync_level;
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struct acpi_thread_state *owner_thread;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ex_release_mutex);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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owner_thread = obj_desc->mutex.owner_thread;
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/* The mutex must have been previously acquired in order to release it */
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if (!owner_thread) {
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ACPI_ERROR((AE_INFO,
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"Cannot release Mutex [%4.4s], not acquired",
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acpi_ut_get_node_name(obj_desc->mutex.node)));
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return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
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}
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/* Must have a valid thread ID */
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if (!walk_state->thread) {
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ACPI_ERROR((AE_INFO,
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"Cannot release Mutex [%4.4s], null thread info",
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acpi_ut_get_node_name(obj_desc->mutex.node)));
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return_ACPI_STATUS(AE_AML_INTERNAL);
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}
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/*
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* The Mutex is owned, but this thread must be the owner.
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* Special case for Global Lock, any thread can release
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*/
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if ((owner_thread->thread_id != walk_state->thread->thread_id) &&
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(obj_desc != acpi_gbl_global_lock_mutex)) {
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ACPI_ERROR((AE_INFO,
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"Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
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(u32)walk_state->thread->thread_id,
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acpi_ut_get_node_name(obj_desc->mutex.node),
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(u32)owner_thread->thread_id));
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return_ACPI_STATUS(AE_AML_NOT_OWNER);
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}
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/*
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* The sync level of the mutex must be equal to the current sync level. In
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* other words, the current level means that at least one mutex at that
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* level is currently being held. Attempting to release a mutex of a
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* different level can only mean that the mutex ordering rule is being
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* violated. This behavior is clarified in ACPI 4.0 specification.
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*/
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if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) {
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ACPI_ERROR((AE_INFO,
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"Cannot release Mutex [%4.4s], SyncLevel mismatch: "
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"mutex %u current %u",
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acpi_ut_get_node_name(obj_desc->mutex.node),
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obj_desc->mutex.sync_level,
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walk_state->thread->current_sync_level));
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return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
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}
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/*
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* Get the previous sync_level from the head of the acquired mutex list.
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* This handles the case where several mutexes at the same level have been
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* acquired, but are not released in reverse order.
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*/
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previous_sync_level =
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owner_thread->acquired_mutex_list->mutex.original_sync_level;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
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"Prev SyncLevel %u, Depth %u TID %p\n",
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obj_desc->mutex.sync_level,
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walk_state->thread->current_sync_level,
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previous_sync_level,
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obj_desc->mutex.acquisition_depth,
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walk_state->thread));
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status = acpi_ex_release_mutex_object(obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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if (obj_desc->mutex.acquisition_depth == 0) {
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/* Restore the previous sync_level */
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owner_thread->current_sync_level = previous_sync_level;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Released: Object SyncLevel %u, Thread SyncLevel, %u, "
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"Prev SyncLevel %u, Depth %u\n",
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obj_desc->mutex.sync_level,
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walk_state->thread->current_sync_level,
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previous_sync_level,
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obj_desc->mutex.acquisition_depth));
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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_ex_release_all_mutexes
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*
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* PARAMETERS: thread - Current executing thread object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Release all mutexes held by this thread
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*
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* NOTE: This function is called as the thread is exiting the interpreter.
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* Mutexes are not released when an individual control method is exited, but
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* only when the parent thread actually exits the interpreter. This allows one
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* method to acquire a mutex, and a different method to release it, as long as
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* this is performed underneath a single parent control method.
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*
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******************************************************************************/
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void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
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{
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union acpi_operand_object *next = thread->acquired_mutex_list;
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union acpi_operand_object *obj_desc;
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ACPI_FUNCTION_TRACE(ex_release_all_mutexes);
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/* Traverse the list of owned mutexes, releasing each one */
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while (next) {
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obj_desc = next;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
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obj_desc->mutex.node->name.ascii,
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obj_desc->mutex.sync_level,
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obj_desc->mutex.acquisition_depth));
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/* Release the mutex, special case for Global Lock */
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if (obj_desc == acpi_gbl_global_lock_mutex) {
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/* Ignore errors */
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(void)acpi_ev_release_global_lock();
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} else {
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acpi_os_release_mutex(obj_desc->mutex.os_mutex);
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}
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/* Update Thread sync_level (Last mutex is the important one) */
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thread->current_sync_level =
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obj_desc->mutex.original_sync_level;
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/* Mark mutex unowned */
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next = obj_desc->mutex.next;
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obj_desc->mutex.prev = NULL;
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obj_desc->mutex.next = NULL;
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obj_desc->mutex.acquisition_depth = 0;
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obj_desc->mutex.owner_thread = NULL;
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obj_desc->mutex.thread_id = 0;
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}
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return_VOID;
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}
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