linux/drivers/acpi/executer/exmutex.c
Robert Moore 44f6c01242 ACPICA 20050408 from Bob Moore
Fixed three cases in the interpreter where an "index"
argument to an ASL function was still (internally) 32
bits instead of the required 64 bits.  This was the Index
argument to the Index, Mid, and Match operators.

The "strupr" function is now permanently local
(acpi_ut_strupr), since this is not a POSIX-defined
function and not present in most kernel-level C
libraries. References to the C library strupr function
have been removed from the headers.

Completed the deployment of static
functions/prototypes. All prototypes with the static
attribute have been moved from the headers to the owning
C file.

ACPICA 20050329 from Bob Moore

An error is now generated if an attempt is made to create
a Buffer Field of length zero (A CreateField with a length
operand of zero.)

The interpreter now issues a warning whenever executable
code at the module level is detected during ACPI table
load. This will give some idea of the prevalence of this
type of code.

Implemented support for references to named objects (other
than control methods) within package objects.

Enhanced package object output for the debug
object. Package objects are now completely dumped, showing
all elements.

Enhanced miscellaneous object output for the debug
object. Any object can now be written to the debug object
(for example, a device object can be written, and the type
of the object will be displayed.)

The "static" qualifier has been added to all local
functions across the core subsystem.

The number of "long" lines (> 80 chars) within the source
has been significantly reduced, by about 1/3.

Cleaned up all header files to ensure that all CA/iASL
functions are prototyped (even static functions) and the
formatting is consistent.

Two new header files have been added, acopcode.h and
acnames.h.

Removed several obsolete functions that were no longer
used.

Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-12 00:08:52 -04:00

376 lines
10 KiB
C

/******************************************************************************
*
* 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")
/* 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 "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
* Thread - Current executing thread object
*
* RETURN: None
*
* DESCRIPTION: Add a mutex to the "acquired_mutex" 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
*
* 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);
}
/* 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
* 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)
{
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: Thread - Current executing thread object
*
* RETURN: Status
*
* DESCRIPTION: Release all mutexes held by this thread
*
******************************************************************************/
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;
}
}