/******************************************************************************
*
* Module Name: evmisc - Miscellaneous event manager support functions
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, Intel Corp.
* 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 "accommon.h"
#include "acevents.h"
#include "acnamesp.h"
#include "acinterp.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME("evmisc")
/* Local prototypes */
static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
static u32 acpi_ev_global_lock_handler(void *context);
static acpi_status acpi_ev_remove_global_lock_handler(void);
/*******************************************************************************
*
* FUNCTION: acpi_ev_is_notify_object
*
* PARAMETERS: Node - Node to check
*
* RETURN: TRUE if notifies allowed on this object
*
* DESCRIPTION: Check type of node for a object that supports notifies.
*
* TBD: This could be replaced by a flag bit in the node.
*
******************************************************************************/
u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
{
switch (node->type) {
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:
/*
* These are the ONLY objects that can receive ACPI notifications
*/
return (TRUE);
default:
return (FALSE);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_queue_notify_request
*
* PARAMETERS: Node - NS node for the notified object
* notify_value - Value from the Notify() request
*
* RETURN: Status
*
* DESCRIPTION: Dispatch a device notification event to a previously
* installed handler.
*
******************************************************************************/
acpi_status
acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
u32 notify_value)
{
union acpi_operand_object *obj_desc;
union acpi_operand_object *handler_obj = NULL;
union acpi_generic_state *notify_info;
acpi_status status = AE_OK;
ACPI_FUNCTION_NAME(ev_queue_notify_request);
/*
* For value 3 (Ejection Request), some device method may need to be run.
* For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
* to be run.
* For value 0x80 (Status Change) on the power button or sleep button,
* initiate soft-off or sleep operation?
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
acpi_ut_get_node_name(node), node, notify_value,
acpi_ut_get_notify_name(notify_value)));
/* Get the notify object attached to the NS Node */
obj_desc = acpi_ns_get_attached_object(node);
if (obj_desc) {
/* We have the notify object, Get the right handler */
switch (node->type) {
/* Notify allowed only on these types */
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_THERMAL:
case ACPI_TYPE_PROCESSOR:
if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
handler_obj =
obj_desc->common_notify.system_notify;
} else {
handler_obj =
obj_desc->common_notify.device_notify;
}
break;
default:
/* All other types are not supported */
return (AE_TYPE);
}
}
/*
* If there is any handler to run, schedule the dispatcher.
* Check for:
* 1) Global system notify handler
* 2) Global device notify handler
* 3) Per-device notify handler
*/
if ((acpi_gbl_system_notify.handler &&
(notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
(acpi_gbl_device_notify.handler &&
(notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
notify_info = acpi_ut_create_generic_state();
if (!notify_info) {
return (AE_NO_MEMORY);
}
if (!handler_obj) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Executing system notify handler for Notify (%4.4s, %X) "
"node %p\n",
acpi_ut_get_node_name(node),
notify_value, node));
}
notify_info->common.descriptor_type =
ACPI_DESC_TYPE_STATE_NOTIFY;
notify_info->notify.node = node;
notify_info->notify.value = (u16) notify_value;
notify_info->notify.handler_obj = handler_obj;
status =
acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
notify_info);
if (ACPI_FAILURE(status)) {
acpi_ut_delete_generic_state(notify_info);
}
} else {
/* There is no notify handler (per-device or system) for this device */
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No notify handler for Notify (%4.4s, %X) node %p\n",
acpi_ut_get_node_name(node), notify_value,
node));
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_notify_dispatch
*
* PARAMETERS: Context - To be passed to the notify handler
*
* RETURN: None.
*
* DESCRIPTION: Dispatch a device notification event to a previously
* installed handler.
*
******************************************************************************/
static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
{
union acpi_generic_state *notify_info =
(union acpi_generic_state *)context;
acpi_notify_handler global_handler = NULL;
void *global_context = NULL;
union acpi_operand_object *handler_obj;
ACPI_FUNCTION_ENTRY();
/*
* We will invoke a global notify handler if installed. This is done
* _before_ we invoke the per-device handler attached to the device.
*/
if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
/* Global system notification handler */
if (acpi_gbl_system_notify.handler) {
global_handler = acpi_gbl_system_notify.handler;
global_context = acpi_gbl_system_notify.context;
}
} else {
/* Global driver notification handler */
if (acpi_gbl_device_notify.handler) {
global_handler = acpi_gbl_device_notify.handler;
global_context = acpi_gbl_device_notify.context;
}
}
/* Invoke the system handler first, if present */
if (global_handler) {
global_handler(notify_info->notify.node,
notify_info->notify.value, global_context);
}
/* Now invoke the per-device handler, if present */
handler_obj = notify_info->notify.handler_obj;
if (handler_obj) {
struct acpi_object_notify_handler *notifier;
notifier = &handler_obj->notify;
while (notifier) {
notifier->handler(notify_info->notify.node,
notify_info->notify.value,
notifier->context);
notifier = notifier->next;
}
}
/* All done with the info object */
acpi_ut_delete_generic_state(notify_info);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_global_lock_handler
*
* PARAMETERS: Context - From thread interface, not used
*
* RETURN: ACPI_INTERRUPT_HANDLED
*
* DESCRIPTION: Invoked directly from the SCI handler when a global lock
* release interrupt occurs. If there's a thread waiting for
* the global lock, signal it.
*
* NOTE: Assumes that the semaphore can be signaled from interrupt level. If
* this is not possible for some reason, a separate thread will have to be
* scheduled to do this.
*
******************************************************************************/
static u8 acpi_ev_global_lock_pending;
static u32 acpi_ev_global_lock_handler(void *context)
{
acpi_status status;
acpi_cpu_flags flags;
flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
if (!acpi_ev_global_lock_pending) {
goto out;
}
/* Send a unit to the semaphore */
status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));
}
acpi_ev_global_lock_pending = FALSE;
out:
acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
return (ACPI_INTERRUPT_HANDLED);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_init_global_lock_handler
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Install a handler for the global lock release event
*
******************************************************************************/
acpi_status acpi_ev_init_global_lock_handler(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
/* Attempt installation of the global lock handler */
status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
acpi_ev_global_lock_handler,
NULL);
/*
* If the global lock does not exist on this platform, the attempt to
* enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
* Map to AE_OK, but mark global lock as not present. Any attempt to
* actually use the global lock will be flagged with an error.
*/
if (status == AE_NO_HARDWARE_RESPONSE) {
ACPI_ERROR((AE_INFO,
"No response from Global Lock hardware, disabling lock"));
acpi_gbl_global_lock_present = FALSE;
return_ACPI_STATUS(AE_OK);
}
acpi_gbl_global_lock_present = TRUE;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_remove_global_lock_handler
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Remove the handler for the Global Lock
*
******************************************************************************/
static acpi_status acpi_ev_remove_global_lock_handler(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
acpi_gbl_global_lock_present = FALSE;
status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
acpi_ev_global_lock_handler);
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_ev_acquire_global_lock
*
* PARAMETERS: Timeout - Max time to wait for the lock, in millisec.
*
* RETURN: Status
*
* DESCRIPTION: Attempt to gain ownership of the Global Lock.
*
* MUTEX: Interpreter must be locked
*
* Note: The original implementation allowed multiple threads to "acquire" the
* Global Lock, and the OS would hold the lock until the last thread had
* released it. However, this could potentially starve the BIOS out of the
* lock, especially in the case where there is a tight handshake between the
* Embedded Controller driver and the BIOS. Therefore, this implementation
* allows only one thread to acquire the HW Global Lock at a time, and makes
* the global lock appear as a standard mutex on the OS side.
*
*****************************************************************************/
static acpi_thread_id acpi_ev_global_lock_thread_id;
static int acpi_ev_global_lock_acquired;
acpi_status acpi_ev_acquire_global_lock(u16 timeout)
{
acpi_cpu_flags flags;
acpi_status status = AE_OK;
u8 acquired = FALSE;
ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
/*
* Only one thread can acquire the GL at a time, the global_lock_mutex
* enforces this. This interface releases the interpreter if we must wait.
*/
status = acpi_ex_system_wait_mutex(
acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
if (status == AE_TIME) {
if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
acpi_ev_global_lock_acquired++;
return AE_OK;
}
}
if (ACPI_FAILURE(status)) {
status = acpi_ex_system_wait_mutex(
acpi_gbl_global_lock_mutex->mutex.os_mutex,
timeout);
}
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
acpi_ev_global_lock_acquired++;
/*
* Update the global lock handle and check for wraparound. The handle is
* only used for the external global lock interfaces, but it is updated
* here to properly handle the case where a single thread may acquire the
* lock via both the AML and the acpi_acquire_global_lock interfaces. The
* handle is therefore updated on the first acquire from a given thread
* regardless of where the acquisition request originated.
*/
acpi_gbl_global_lock_handle++;
if (acpi_gbl_global_lock_handle == 0) {
acpi_gbl_global_lock_handle = 1;
}
/*
* Make sure that a global lock actually exists. If not, just treat the
* lock as a standard mutex.
*/
if (!acpi_gbl_global_lock_present) {
acpi_gbl_global_lock_acquired = TRUE;
return_ACPI_STATUS(AE_OK);
}
flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
do {
/* Attempt to acquire the actual hardware lock */
ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
if (acquired) {
acpi_gbl_global_lock_acquired = TRUE;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Acquired hardware Global Lock\n"));
break;
}
acpi_ev_global_lock_pending = TRUE;
acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
/*
* Did not get the lock. The pending bit was set above, and we
* must wait until we get the global lock released interrupt.
*/
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Waiting for hardware Global Lock\n"));
/*
* Wait for handshake with the global lock interrupt handler.
* This interface releases the interpreter if we must wait.
*/
status = acpi_ex_system_wait_semaphore(
acpi_gbl_global_lock_semaphore,
ACPI_WAIT_FOREVER);
flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
} while (ACPI_SUCCESS(status));
acpi_ev_global_lock_pending = FALSE;
acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_release_global_lock
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Releases ownership of the Global Lock.
*
******************************************************************************/
acpi_status acpi_ev_release_global_lock(void)
{
u8 pending = FALSE;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(ev_release_global_lock);
/* Lock must be already acquired */
if (!acpi_gbl_global_lock_acquired) {
ACPI_WARNING((AE_INFO,
"Cannot release the ACPI Global Lock, it has not been acquired"));
return_ACPI_STATUS(AE_NOT_ACQUIRED);
}
acpi_ev_global_lock_acquired--;
if (acpi_ev_global_lock_acquired > 0) {
return AE_OK;
}
if (acpi_gbl_global_lock_present) {
/* Allow any thread to release the lock */
ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
/*
* If the pending bit was set, we must write GBL_RLS to the control
* register
*/
if (pending) {
status =
acpi_write_bit_register
(ACPI_BITREG_GLOBAL_LOCK_RELEASE,
ACPI_ENABLE_EVENT);
}
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Released hardware Global Lock\n"));
}
acpi_gbl_global_lock_acquired = FALSE;
/* Release the local GL mutex */
acpi_ev_global_lock_thread_id = 0;
acpi_ev_global_lock_acquired = 0;
acpi_os_release_mutex(acpi_gbl_global_lock_mutex->mutex.os_mutex);
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_ev_terminate
*
* PARAMETERS: none
*
* RETURN: none
*
* DESCRIPTION: Disable events and free memory allocated for table storage.
*
******************************************************************************/
void acpi_ev_terminate(void)
{
u32 i;
acpi_status status;
ACPI_FUNCTION_TRACE(ev_terminate);
if (acpi_gbl_events_initialized) {
/*
* Disable all event-related functionality. In all cases, on error,
* print a message but obviously we don't abort.
*/
/* Disable all fixed events */
for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
status = acpi_disable_event(i, 0);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Could not disable fixed event %u",
(u32) i));
}
}
/* Disable all GPEs in all GPE blocks */
status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
/* Remove SCI handler */
status = acpi_ev_remove_sci_handler();
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
}
status = acpi_ev_remove_global_lock_handler();
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Could not remove Global Lock handler"));
}
}
/* Deallocate all handler objects installed within GPE info structs */
status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
/* Return to original mode if necessary */
if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
status = acpi_disable();
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
}
}
return_VOID;
}