forked from Minki/linux
c81da66608
Completed a new design and implementation for the ACPI Global Lock support. On the OS side, the global lock is now treated as a standard AML mutex. Previously, multiple OS threads could acquire the global lock simultaneously, but this could cause the BIOS to be starved by the lock in cases such as the Embedded Controller driver, where there is a tight coupling between the OS and the BIOS. Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
320 lines
9.2 KiB
C
320 lines
9.2 KiB
C
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: exsystem - Interface to OS services
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (C) 2000 - 2006, 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>
|
|
#include <acpi/acevents.h>
|
|
|
|
#define _COMPONENT ACPI_EXECUTER
|
|
ACPI_MODULE_NAME("exsystem")
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_wait_semaphore
|
|
*
|
|
* PARAMETERS: Semaphore - Semaphore to wait on
|
|
* Timeout - Max time to wait
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Implements a semaphore wait with a check to see if the
|
|
* semaphore is available immediately. If it is not, the
|
|
* interpreter is released before waiting.
|
|
*
|
|
******************************************************************************/
|
|
acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
|
|
{
|
|
acpi_status status;
|
|
acpi_status status2;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
|
|
|
|
status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
|
|
if (ACPI_SUCCESS(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
if (status == AE_TIME) {
|
|
|
|
/* We must wait, so unlock the interpreter */
|
|
|
|
acpi_ex_exit_interpreter();
|
|
|
|
status = acpi_os_wait_semaphore(semaphore, 1, timeout);
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
|
"*** Thread awake after blocking, %s\n",
|
|
acpi_format_exception(status)));
|
|
|
|
/* Reacquire the interpreter */
|
|
|
|
status2 = acpi_ex_enter_interpreter();
|
|
if (ACPI_FAILURE(status2)) {
|
|
|
|
/* Report fatal error, could not acquire interpreter */
|
|
|
|
return_ACPI_STATUS(status2);
|
|
}
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_wait_mutex
|
|
*
|
|
* PARAMETERS: Mutex - Mutex to wait on
|
|
* Timeout - Max time to wait
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Implements a mutex wait with a check to see if the
|
|
* mutex is available immediately. If it is not, the
|
|
* interpreter is released before waiting.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
|
|
{
|
|
acpi_status status;
|
|
acpi_status status2;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
|
|
|
|
status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
|
|
if (ACPI_SUCCESS(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
if (status == AE_TIME) {
|
|
|
|
/* We must wait, so unlock the interpreter */
|
|
|
|
acpi_ex_exit_interpreter();
|
|
|
|
status = acpi_os_acquire_mutex(mutex, timeout);
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
|
"*** Thread awake after blocking, %s\n",
|
|
acpi_format_exception(status)));
|
|
|
|
/* Reacquire the interpreter */
|
|
|
|
status2 = acpi_ex_enter_interpreter();
|
|
if (ACPI_FAILURE(status2)) {
|
|
|
|
/* Report fatal error, could not acquire interpreter */
|
|
|
|
return_ACPI_STATUS(status2);
|
|
}
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_do_stall
|
|
*
|
|
* PARAMETERS: how_long - The amount of time to stall,
|
|
* in microseconds
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Suspend running thread for specified amount of time.
|
|
* Note: ACPI specification requires that Stall() does not
|
|
* relinquish the processor, and delays longer than 100 usec
|
|
* should use Sleep() instead. We allow stalls up to 255 usec
|
|
* for compatibility with other interpreters and existing BIOSs.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ex_system_do_stall(u32 how_long)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
ACPI_FUNCTION_ENTRY();
|
|
|
|
if (how_long > 255) { /* 255 microseconds */
|
|
/*
|
|
* Longer than 255 usec, this is an error
|
|
*
|
|
* (ACPI specifies 100 usec as max, but this gives some slack in
|
|
* order to support existing BIOSs)
|
|
*/
|
|
ACPI_ERROR((AE_INFO, "Time parameter is too large (%d)",
|
|
how_long));
|
|
status = AE_AML_OPERAND_VALUE;
|
|
} else {
|
|
acpi_os_stall(how_long);
|
|
}
|
|
|
|
return (status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_do_suspend
|
|
*
|
|
* PARAMETERS: how_long - The amount of time to suspend,
|
|
* in milliseconds
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Suspend running thread for specified amount of time.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ex_system_do_suspend(acpi_integer how_long)
|
|
{
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_ENTRY();
|
|
|
|
/* Since this thread will sleep, we must release the interpreter */
|
|
|
|
acpi_ex_exit_interpreter();
|
|
|
|
acpi_os_sleep(how_long);
|
|
|
|
/* And now we must get the interpreter again */
|
|
|
|
status = acpi_ex_enter_interpreter();
|
|
return (status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_signal_event
|
|
*
|
|
* PARAMETERS: obj_desc - The object descriptor for this op
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Provides an access point to perform synchronization operations
|
|
* within the AML.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_system_signal_event);
|
|
|
|
if (obj_desc) {
|
|
status =
|
|
acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_wait_event
|
|
*
|
|
* PARAMETERS: time_desc - The 'time to delay' object descriptor
|
|
* obj_desc - The object descriptor for this op
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Provides an access point to perform synchronization operations
|
|
* within the AML. This operation is a request to wait for an
|
|
* event.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status
|
|
acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
|
|
union acpi_operand_object *obj_desc)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
|
|
ACPI_FUNCTION_TRACE(ex_system_wait_event);
|
|
|
|
if (obj_desc) {
|
|
status =
|
|
acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
|
|
(u16) time_desc->integer.
|
|
value);
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ex_system_reset_event
|
|
*
|
|
* PARAMETERS: obj_desc - The object descriptor for this op
|
|
*
|
|
* RETURN: Status
|
|
*
|
|
* DESCRIPTION: Reset an event to a known state.
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
acpi_semaphore temp_semaphore;
|
|
|
|
ACPI_FUNCTION_ENTRY();
|
|
|
|
/*
|
|
* We are going to simply delete the existing semaphore and
|
|
* create a new one!
|
|
*/
|
|
status =
|
|
acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
|
|
if (ACPI_SUCCESS(status)) {
|
|
(void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
|
|
obj_desc->event.os_semaphore = temp_semaphore;
|
|
}
|
|
|
|
return (status);
|
|
}
|