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-rw-r--r--drivers/acpi/executer/exmutex.c363
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diff --git a/drivers/acpi/executer/exmutex.c b/drivers/acpi/executer/exmutex.c
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+
+/******************************************************************************
+ *
+ * Module Name: exmutex - ASL Mutex Acquire/Release functions
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+
+#include <acpi/acpi.h>
+#include <acpi/acinterp.h>
+
+#define _COMPONENT ACPI_EXECUTER
+ ACPI_MODULE_NAME ("exmutex")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_unlink_mutex
+ *
+ * PARAMETERS: obj_desc - The mutex to be unlinked
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Remove a mutex from the "acquired_mutex" 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;
+ }
+ else {
+ thread->acquired_mutex_list = obj_desc->mutex.next;
+ }
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_link_mutex
+ *
+ * PARAMETERS: obj_desc - The mutex to be linked
+ * list_head - head of the "acquired_mutex" list
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Add a mutex to the "acquired_mutex" list for this walk
+ *
+ ******************************************************************************/
+
+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
+ *
+ * PARAMETERS: time_desc - The 'time to delay' object descriptor
+ * obj_desc - The object descriptor for this op
+ *
+ * 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);
+ }
+
+ /* Sanity check -- we must have a valid thread ID */
+
+ if (!walk_state->thread) {
+ ACPI_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], null thread info\n",
+ acpi_ut_get_node_name (obj_desc->mutex.node)));
+ return_ACPI_STATUS (AE_AML_INTERNAL);
+ }
+
+ /*
+ * Current Sync 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_REPORT_ERROR (("Cannot acquire Mutex [%4.4s], incorrect sync_level\n",
+ acpi_ut_get_node_name (obj_desc->mutex.node)));
+ return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
+ }
+
+ /* Support for multiple acquires by the owning thread */
+
+ if (obj_desc->mutex.owner_thread) {
+ /* Special case for Global Lock, allow all threads */
+
+ if ((obj_desc->mutex.owner_thread->thread_id == walk_state->thread->thread_id) ||
+ (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore)) {
+ /*
+ * 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 */
+
+ status = acpi_ex_system_acquire_mutex (time_desc, obj_desc);
+ if (ACPI_FAILURE (status)) {
+ /* Includes failure from a timeout on time_desc */
+
+ return_ACPI_STATUS (status);
+ }
+
+ /* Have the mutex: update mutex and walk info and save the sync_level */
+
+ obj_desc->mutex.owner_thread = walk_state->thread;
+ obj_desc->mutex.acquisition_depth = 1;
+ 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);
+
+ return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_release_mutex
+ *
+ * PARAMETERS: obj_desc - The object descriptor for this op
+ *
+ * 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)
+{
+ acpi_status status;
+
+
+ ACPI_FUNCTION_TRACE ("ex_release_mutex");
+
+
+ if (!obj_desc) {
+ return_ACPI_STATUS (AE_BAD_PARAMETER);
+ }
+
+ /* The mutex must have been previously acquired in order to release it */
+
+ if (!obj_desc->mutex.owner_thread) {
+ ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], not acquired\n",
+ acpi_ut_get_node_name (obj_desc->mutex.node)));
+ return_ACPI_STATUS (AE_AML_MUTEX_NOT_ACQUIRED);
+ }
+
+ /* Sanity check -- we must have a valid thread ID */
+
+ if (!walk_state->thread) {
+ ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], null thread info\n",
+ 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 ((obj_desc->mutex.owner_thread->thread_id != walk_state->thread->thread_id) &&
+ (obj_desc->mutex.semaphore != acpi_gbl_global_lock_semaphore)) {
+ ACPI_REPORT_ERROR ((
+ "Thread %X cannot release Mutex [%4.4s] acquired by thread %X\n",
+ walk_state->thread->thread_id,
+ acpi_ut_get_node_name (obj_desc->mutex.node),
+ obj_desc->mutex.owner_thread->thread_id));
+ return_ACPI_STATUS (AE_AML_NOT_OWNER);
+ }
+
+ /*
+ * The sync level of the mutex must be less than or
+ * equal to the current sync level
+ */
+ if (obj_desc->mutex.sync_level > walk_state->thread->current_sync_level) {
+ ACPI_REPORT_ERROR (("Cannot release Mutex [%4.4s], incorrect sync_level\n",
+ acpi_ut_get_node_name (obj_desc->mutex.node)));
+ return_ACPI_STATUS (AE_AML_MUTEX_ORDER);
+ }
+
+ /* 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);
+ }
+
+ /* Unlink the mutex from the owner's list */
+
+ acpi_ex_unlink_mutex (obj_desc);
+
+ /* Release the mutex */
+
+ status = acpi_ex_system_release_mutex (obj_desc);
+
+ /* Update the mutex and walk state, restore sync_level before acquire */
+
+ obj_desc->mutex.owner_thread = NULL;
+ walk_state->thread->current_sync_level = obj_desc->mutex.original_sync_level;
+
+ return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_release_all_mutexes
+ *
+ * PARAMETERS: mutex_list - Head of the mutex list
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Release all mutexes in the list
+ *
+ ******************************************************************************/
+
+void
+acpi_ex_release_all_mutexes (
+ struct acpi_thread_state *thread)
+{
+ union acpi_operand_object *next = thread->acquired_mutex_list;
+ union acpi_operand_object *this;
+ acpi_status status;
+
+
+ ACPI_FUNCTION_ENTRY ();
+
+
+ /* Traverse the list of owned mutexes, releasing each one */
+
+ while (next) {
+ this = next;
+ next = this->mutex.next;
+
+ this->mutex.acquisition_depth = 1;
+ this->mutex.prev = NULL;
+ this->mutex.next = NULL;
+
+ /* Release the mutex */
+
+ status = acpi_ex_system_release_mutex (this);
+ if (ACPI_FAILURE (status)) {
+ continue;
+ }
+
+ /* Mark mutex unowned */
+
+ this->mutex.owner_thread = NULL;
+
+ /* Update Thread sync_level (Last mutex is the important one) */
+
+ thread->current_sync_level = this->mutex.original_sync_level;
+ }
+}
+
+
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