Contributors: 9
Author Tokens Token Proportion Commits Commit Proportion
Linus Torvalds 533 41.41% 2 5.00%
Robert Moore 410 31.86% 17 42.50%
Andy Grover 184 14.30% 6 15.00%
Len Brown 95 7.38% 6 15.00%
Linus Torvalds (pre-git) 41 3.19% 4 10.00%
Lin Ming 21 1.63% 2 5.00%
Erik Schmauss 1 0.08% 1 2.50%
Lv Zheng 1 0.08% 1 2.50%
Patrick Mochel 1 0.08% 1 2.50%
Total 1287 40 


// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exmutex - ASL Mutex Acquire/Release functions
 *
 * Copyright (C) 2000 - 2022, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acevents.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exmutex")

/* Local prototypes */
static void
acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
		   struct acpi_thread_state *thread);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_unlink_mutex
 *
 * PARAMETERS:  obj_desc            - The mutex to be unlinked
 *
 * RETURN:      None
 *
 * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list
 *
 ******************************************************************************/

void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc)
{
	struct acpi_thread_state *thread = obj_desc->mutex.owner_thread;

	if (!thread) {
		return;
	}

	/* Doubly linked list */

	if (obj_desc->mutex.next) {
		(obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev;
	}

	if (obj_desc->mutex.prev) {
		(obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next;

		/*
		 * Migrate the previous sync level associated with this mutex to
		 * the previous mutex on the list so that it may be preserved.
		 * This handles the case where several mutexes have been acquired
		 * at the same level, but are not released in opposite order.
		 */
		(obj_desc->mutex.prev)->mutex.original_sync_level =
		    obj_desc->mutex.original_sync_level;
	} else {
		thread->acquired_mutex_list = obj_desc->mutex.next;
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_link_mutex
 *
 * PARAMETERS:  obj_desc            - The mutex to be linked
 *              thread              - Current executing thread object
 *
 * RETURN:      None
 *
 * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk
 *
 ******************************************************************************/

static void
acpi_ex_link_mutex(union acpi_operand_object *obj_desc,
		   struct acpi_thread_state *thread)
{
	union acpi_operand_object *list_head;

	list_head = thread->acquired_mutex_list;

	/* This object will be the first object in the list */

	obj_desc->mutex.prev = NULL;
	obj_desc->mutex.next = list_head;

	/* Update old first object to point back to this object */

	if (list_head) {
		list_head->mutex.prev = obj_desc;
	}

	/* Update list head */

	thread->acquired_mutex_list = obj_desc;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_acquire_mutex_object
 *
 * PARAMETERS:  timeout             - Timeout in milliseconds
 *              obj_desc            - Mutex object
 *              thread_id           - Current thread state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common
 *              path that supports multiple acquires by the same thread.
 *
 * MUTEX:       Interpreter must be locked
 *
 * NOTE: This interface is called from three places:
 * 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator
 * 2) From acpi_ex_acquire_global_lock when an AML Field access requires the
 *    global lock
 * 3) From the external interface, acpi_acquire_global_lock
 *
 ******************************************************************************/

acpi_status
acpi_ex_acquire_mutex_object(u16 timeout,
			     union acpi_operand_object *obj_desc,
			     acpi_thread_id thread_id)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);

	if (!obj_desc) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Support for multiple acquires by the owning thread */

	if (obj_desc->mutex.thread_id == thread_id) {
		/*
		 * The mutex is already owned by this thread, just increment the
		 * acquisition depth
		 */
		obj_desc->mutex.acquisition_depth++;
		return_ACPI_STATUS(AE_OK);
	}

	/* Acquire the mutex, wait if necessary. Special case for Global Lock */

	if (obj_desc == acpi_gbl_global_lock_mutex) {
		status = acpi_ev_acquire_global_lock(timeout);
	} else {
		status =
		    acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
					      timeout);
	}

	if (ACPI_FAILURE(status)) {

		/* Includes failure from a timeout on time_desc */

		return_ACPI_STATUS(status);
	}

	/* Acquired the mutex: update mutex object */

	obj_desc->mutex.thread_id = thread_id;
	obj_desc->mutex.acquisition_depth = 1;
	obj_desc->mutex.original_sync_level = 0;
	obj_desc->mutex.owner_thread = NULL;	/* Used only for AML Acquire() */

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_acquire_mutex
 *
 * PARAMETERS:  time_desc           - Timeout integer
 *              obj_desc            - Mutex object
 *              walk_state          - Current method execution state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire an AML mutex
 *
 ******************************************************************************/

acpi_status
acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
		      union acpi_operand_object *obj_desc,
		      struct acpi_walk_state *walk_state)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);

	if (!obj_desc) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Must have a valid thread state struct */

	if (!walk_state->thread) {
		ACPI_ERROR((AE_INFO,
			    "Cannot acquire Mutex [%4.4s], null thread info",
			    acpi_ut_get_node_name(obj_desc->mutex.node)));
		return_ACPI_STATUS(AE_AML_INTERNAL);
	}

	/*
	 * Current sync level must be less than or equal to the sync level
	 * of the mutex. This mechanism provides some deadlock prevention.
	 */
	if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
		ACPI_ERROR((AE_INFO,
			    "Cannot acquire Mutex [%4.4s], "
			    "current SyncLevel is too large (%u)",
			    acpi_ut_get_node_name(obj_desc->mutex.node),
			    walk_state->thread->current_sync_level));
		return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Acquiring: Mutex SyncLevel %u, Thread SyncLevel %u, "
			  "Depth %u TID %p\n",
			  obj_desc->mutex.sync_level,
			  walk_state->thread->current_sync_level,
			  obj_desc->mutex.acquisition_depth,
			  walk_state->thread));

	status = acpi_ex_acquire_mutex_object((u16)time_desc->integer.value,
					      obj_desc,
					      walk_state->thread->thread_id);

	if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) {

		/* Save Thread object, original/current sync levels */

		obj_desc->mutex.owner_thread = walk_state->thread;
		obj_desc->mutex.original_sync_level =
		    walk_state->thread->current_sync_level;
		walk_state->thread->current_sync_level =
		    obj_desc->mutex.sync_level;

		/* Link the mutex to the current thread for force-unlock at method exit */

		acpi_ex_link_mutex(obj_desc, walk_state->thread);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Acquired: Mutex SyncLevel %u, Thread SyncLevel %u, Depth %u\n",
			  obj_desc->mutex.sync_level,
			  walk_state->thread->current_sync_level,
			  obj_desc->mutex.acquisition_depth));

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_release_mutex_object
 *
 * PARAMETERS:  obj_desc            - The object descriptor for this op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release a previously acquired Mutex, low level interface.
 *              Provides a common path that supports multiple releases (after
 *              previous multiple acquires) by the same thread.
 *
 * MUTEX:       Interpreter must be locked
 *
 * NOTE: This interface is called from three places:
 * 1) From acpi_ex_release_mutex, via an AML Acquire() operator
 * 2) From acpi_ex_release_global_lock when an AML Field access requires the
 *    global lock
 * 3) From the external interface, acpi_release_global_lock
 *
 ******************************************************************************/

acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ex_release_mutex_object);

	if (obj_desc->mutex.acquisition_depth == 0) {
		return_ACPI_STATUS(AE_NOT_ACQUIRED);
	}

	/* Match multiple Acquires with multiple Releases */

	obj_desc->mutex.acquisition_depth--;
	if (obj_desc->mutex.acquisition_depth != 0) {

		/* Just decrement the depth and return */

		return_ACPI_STATUS(AE_OK);
	}

	if (obj_desc->mutex.owner_thread) {

		/* Unlink the mutex from the owner's list */

		acpi_ex_unlink_mutex(obj_desc);
		obj_desc->mutex.owner_thread = NULL;
	}

	/* Release the mutex, special case for Global Lock */

	if (obj_desc == acpi_gbl_global_lock_mutex) {
		status = acpi_ev_release_global_lock();
	} else {
		acpi_os_release_mutex(obj_desc->mutex.os_mutex);
	}

	/* Clear mutex info */

	obj_desc->mutex.thread_id = 0;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_release_mutex
 *
 * PARAMETERS:  obj_desc            - The object descriptor for this op
 *              walk_state          - Current method execution state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release a previously acquired Mutex.
 *
 ******************************************************************************/

acpi_status
acpi_ex_release_mutex(union acpi_operand_object *obj_desc,
		      struct acpi_walk_state *walk_state)
{
	u8 previous_sync_level;
	struct acpi_thread_state *owner_thread;
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(ex_release_mutex);

	if (!obj_desc) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	owner_thread = obj_desc->mutex.owner_thread;

	/* The mutex must have been previously acquired in order to release it */

	if (!owner_thread) {
		ACPI_ERROR((AE_INFO,
			    "Cannot release Mutex [%4.4s], not acquired",
			    acpi_ut_get_node_name(obj_desc->mutex.node)));
		return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
	}

	/* Must have a valid thread ID */

	if (!walk_state->thread) {
		ACPI_ERROR((AE_INFO,
			    "Cannot release Mutex [%4.4s], null thread info",
			    acpi_ut_get_node_name(obj_desc->mutex.node)));
		return_ACPI_STATUS(AE_AML_INTERNAL);
	}

	/*
	 * The Mutex is owned, but this thread must be the owner.
	 * Special case for Global Lock, any thread can release
	 */
	if ((owner_thread->thread_id != walk_state->thread->thread_id) &&
	    (obj_desc != acpi_gbl_global_lock_mutex)) {
		ACPI_ERROR((AE_INFO,
			    "Thread %u cannot release Mutex [%4.4s] acquired by thread %u",
			    (u32)walk_state->thread->thread_id,
			    acpi_ut_get_node_name(obj_desc->mutex.node),
			    (u32)owner_thread->thread_id));
		return_ACPI_STATUS(AE_AML_NOT_OWNER);
	}

	/*
	 * The sync level of the mutex must be equal to the current sync level. In
	 * other words, the current level means that at least one mutex at that
	 * level is currently being held. Attempting to release a mutex of a
	 * different level can only mean that the mutex ordering rule is being
	 * violated. This behavior is clarified in ACPI 4.0 specification.
	 */
	if (obj_desc->mutex.sync_level != owner_thread->current_sync_level) {
		ACPI_ERROR((AE_INFO,
			    "Cannot release Mutex [%4.4s], SyncLevel mismatch: "
			    "mutex %u current %u",
			    acpi_ut_get_node_name(obj_desc->mutex.node),
			    obj_desc->mutex.sync_level,
			    walk_state->thread->current_sync_level));
		return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
	}

	/*
	 * Get the previous sync_level from the head of the acquired mutex list.
	 * This handles the case where several mutexes at the same level have been
	 * acquired, but are not released in reverse order.
	 */
	previous_sync_level =
	    owner_thread->acquired_mutex_list->mutex.original_sync_level;

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Releasing: Object SyncLevel %u, Thread SyncLevel %u, "
			  "Prev SyncLevel %u, Depth %u TID %p\n",
			  obj_desc->mutex.sync_level,
			  walk_state->thread->current_sync_level,
			  previous_sync_level,
			  obj_desc->mutex.acquisition_depth,
			  walk_state->thread));

	status = acpi_ex_release_mutex_object(obj_desc);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (obj_desc->mutex.acquisition_depth == 0) {

		/* Restore the previous sync_level */

		owner_thread->current_sync_level = previous_sync_level;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Released: Object SyncLevel %u, Thread SyncLevel, %u, "
			  "Prev SyncLevel %u, Depth %u\n",
			  obj_desc->mutex.sync_level,
			  walk_state->thread->current_sync_level,
			  previous_sync_level,
			  obj_desc->mutex.acquisition_depth));

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_release_all_mutexes
 *
 * PARAMETERS:  thread              - Current executing thread object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release all mutexes held by this thread
 *
 * NOTE: This function is called as the thread is exiting the interpreter.
 * Mutexes are not released when an individual control method is exited, but
 * only when the parent thread actually exits the interpreter. This allows one
 * method to acquire a mutex, and a different method to release it, as long as
 * this is performed underneath a single parent control method.
 *
 ******************************************************************************/

void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread)
{
	union acpi_operand_object *next = thread->acquired_mutex_list;
	union acpi_operand_object *obj_desc;

	ACPI_FUNCTION_TRACE(ex_release_all_mutexes);

	/* Traverse the list of owned mutexes, releasing each one */

	while (next) {
		obj_desc = next;
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "Mutex [%4.4s] force-release, SyncLevel %u Depth %u\n",
				  obj_desc->mutex.node->name.ascii,
				  obj_desc->mutex.sync_level,
				  obj_desc->mutex.acquisition_depth));

		/* Release the mutex, special case for Global Lock */

		if (obj_desc == acpi_gbl_global_lock_mutex) {

			/* Ignore errors */

			(void)acpi_ev_release_global_lock();
		} else {
			acpi_os_release_mutex(obj_desc->mutex.os_mutex);
		}

		/* Update Thread sync_level (Last mutex is the important one) */

		thread->current_sync_level =
		    obj_desc->mutex.original_sync_level;

		/* Mark mutex unowned */

		next = obj_desc->mutex.next;

		obj_desc->mutex.prev = NULL;
		obj_desc->mutex.next = NULL;
		obj_desc->mutex.acquisition_depth = 0;
		obj_desc->mutex.owner_thread = NULL;
		obj_desc->mutex.thread_id = 0;
	}

	return_VOID;
}