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506 lines
15 KiB
506 lines
15 KiB
// 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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