![Bob Moore](/assets/img/avatar_default.png)
Split long lines, update comments. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
624 lines
18 KiB
C
624 lines
18 KiB
C
/******************************************************************************
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*
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* Module Name: evmisc - Miscellaneous event manager support functions
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acevents.h"
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#include "acnamesp.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evmisc")
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/* Local prototypes */
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static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
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static u32 acpi_ev_global_lock_handler(void *context);
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static acpi_status acpi_ev_remove_global_lock_handler(void);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_is_notify_object
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*
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* PARAMETERS: Node - Node to check
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*
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* RETURN: TRUE if notifies allowed on this object
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*
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* DESCRIPTION: Check type of node for a object that supports notifies.
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*
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* TBD: This could be replaced by a flag bit in the node.
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*
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******************************************************************************/
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u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
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{
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switch (node->type) {
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case ACPI_TYPE_DEVICE:
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case ACPI_TYPE_PROCESSOR:
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case ACPI_TYPE_THERMAL:
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/*
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* These are the ONLY objects that can receive ACPI notifications
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*/
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return (TRUE);
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default:
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return (FALSE);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_queue_notify_request
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*
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* PARAMETERS: Node - NS node for the notified object
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* notify_value - Value from the Notify() request
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*
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* RETURN: Status
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*
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* DESCRIPTION: Dispatch a device notification event to a previously
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* installed handler.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
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u32 notify_value)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *handler_obj = NULL;
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union acpi_generic_state *notify_info;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_NAME(ev_queue_notify_request);
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/*
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* For value 3 (Ejection Request), some device method may need to be run.
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* For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
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* to be run.
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* For value 0x80 (Status Change) on the power button or sleep button,
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* initiate soft-off or sleep operation?
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
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acpi_ut_get_node_name(node), node, notify_value,
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acpi_ut_get_notify_name(notify_value)));
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/* Get the notify object attached to the NS Node */
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obj_desc = acpi_ns_get_attached_object(node);
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if (obj_desc) {
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/* We have the notify object, Get the right handler */
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switch (node->type) {
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/* Notify allowed only on these types */
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case ACPI_TYPE_DEVICE:
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case ACPI_TYPE_THERMAL:
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case ACPI_TYPE_PROCESSOR:
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if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
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handler_obj =
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obj_desc->common_notify.system_notify;
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} else {
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handler_obj =
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obj_desc->common_notify.device_notify;
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}
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break;
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default:
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/* All other types are not supported */
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return (AE_TYPE);
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}
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}
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/*
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* If there is any handler to run, schedule the dispatcher.
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* Check for:
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* 1) Global system notify handler
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* 2) Global device notify handler
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* 3) Per-device notify handler
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*/
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if ((acpi_gbl_system_notify.handler &&
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(notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
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(acpi_gbl_device_notify.handler &&
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(notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
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notify_info = acpi_ut_create_generic_state();
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if (!notify_info) {
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return (AE_NO_MEMORY);
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}
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if (!handler_obj) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Executing system notify handler for Notify (%4.4s, %X) "
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"node %p\n",
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acpi_ut_get_node_name(node),
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notify_value, node));
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}
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notify_info->common.descriptor_type =
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ACPI_DESC_TYPE_STATE_NOTIFY;
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notify_info->notify.node = node;
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notify_info->notify.value = (u16) notify_value;
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notify_info->notify.handler_obj = handler_obj;
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status =
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acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
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notify_info);
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if (ACPI_FAILURE(status)) {
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acpi_ut_delete_generic_state(notify_info);
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}
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} else {
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/* There is no notify handler (per-device or system) for this device */
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No notify handler for Notify (%4.4s, %X) node %p\n",
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acpi_ut_get_node_name(node), notify_value,
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node));
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}
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_notify_dispatch
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*
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* PARAMETERS: Context - To be passed to the notify handler
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*
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* RETURN: None.
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*
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* DESCRIPTION: Dispatch a device notification event to a previously
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* installed handler.
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*
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******************************************************************************/
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static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
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{
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union acpi_generic_state *notify_info =
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(union acpi_generic_state *)context;
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acpi_notify_handler global_handler = NULL;
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void *global_context = NULL;
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union acpi_operand_object *handler_obj;
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ACPI_FUNCTION_ENTRY();
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/*
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* We will invoke a global notify handler if installed. This is done
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* _before_ we invoke the per-device handler attached to the device.
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*/
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if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
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/* Global system notification handler */
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if (acpi_gbl_system_notify.handler) {
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global_handler = acpi_gbl_system_notify.handler;
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global_context = acpi_gbl_system_notify.context;
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}
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} else {
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/* Global driver notification handler */
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if (acpi_gbl_device_notify.handler) {
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global_handler = acpi_gbl_device_notify.handler;
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global_context = acpi_gbl_device_notify.context;
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}
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}
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/* Invoke the system handler first, if present */
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if (global_handler) {
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global_handler(notify_info->notify.node,
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notify_info->notify.value, global_context);
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}
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/* Now invoke the per-device handler, if present */
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handler_obj = notify_info->notify.handler_obj;
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if (handler_obj) {
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handler_obj->notify.handler(notify_info->notify.node,
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notify_info->notify.value,
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handler_obj->notify.context);
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}
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/* All done with the info object */
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acpi_ut_delete_generic_state(notify_info);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_global_lock_handler
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*
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* PARAMETERS: Context - From thread interface, not used
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*
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* RETURN: ACPI_INTERRUPT_HANDLED
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*
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* DESCRIPTION: Invoked directly from the SCI handler when a global lock
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* release interrupt occurs. Attempt to acquire the global lock,
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* if successful, signal the thread waiting for the lock.
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*
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* NOTE: Assumes that the semaphore can be signaled from interrupt level. If
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* this is not possible for some reason, a separate thread will have to be
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* scheduled to do this.
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*
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******************************************************************************/
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static u32 acpi_ev_global_lock_handler(void *context)
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{
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u8 acquired = FALSE;
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/*
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* Attempt to get the lock.
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*
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* If we don't get it now, it will be marked pending and we will
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* take another interrupt when it becomes free.
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*/
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ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
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if (acquired) {
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/* Got the lock, now wake all threads waiting for it */
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acpi_gbl_global_lock_acquired = TRUE;
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/* Send a unit to the semaphore */
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if (ACPI_FAILURE
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(acpi_os_signal_semaphore
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(acpi_gbl_global_lock_semaphore, 1))) {
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ACPI_ERROR((AE_INFO,
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"Could not signal Global Lock semaphore"));
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}
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}
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return (ACPI_INTERRUPT_HANDLED);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_init_global_lock_handler
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Install a handler for the global lock release event
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*
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******************************************************************************/
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acpi_status acpi_ev_init_global_lock_handler(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
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/* Attempt installation of the global lock handler */
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status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
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acpi_ev_global_lock_handler,
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NULL);
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/*
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* If the global lock does not exist on this platform, the attempt to
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* enable GBL_STATUS will fail (the GBL_ENABLE bit will not stick).
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* Map to AE_OK, but mark global lock as not present. Any attempt to
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* actually use the global lock will be flagged with an error.
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*/
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if (status == AE_NO_HARDWARE_RESPONSE) {
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ACPI_ERROR((AE_INFO,
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"No response from Global Lock hardware, disabling lock"));
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acpi_gbl_global_lock_present = FALSE;
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return_ACPI_STATUS(AE_OK);
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}
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acpi_gbl_global_lock_present = TRUE;
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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_ev_remove_global_lock_handler
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Remove the handler for the Global Lock
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*
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******************************************************************************/
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static acpi_status acpi_ev_remove_global_lock_handler(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_remove_global_lock_handler);
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acpi_gbl_global_lock_present = FALSE;
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status = acpi_remove_fixed_event_handler(ACPI_EVENT_GLOBAL,
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acpi_ev_global_lock_handler);
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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_ev_acquire_global_lock
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*
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* PARAMETERS: Timeout - Max time to wait for the lock, in millisec.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Attempt to gain ownership of the Global Lock.
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*
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* MUTEX: Interpreter must be locked
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*
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* Note: The original implementation allowed multiple threads to "acquire" the
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* Global Lock, and the OS would hold the lock until the last thread had
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* released it. However, this could potentially starve the BIOS out of the
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* lock, especially in the case where there is a tight handshake between the
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* Embedded Controller driver and the BIOS. Therefore, this implementation
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* allows only one thread to acquire the HW Global Lock at a time, and makes
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* the global lock appear as a standard mutex on the OS side.
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*
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*****************************************************************************/
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static acpi_thread_id acpi_ev_global_lock_thread_id;
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static int acpi_ev_global_lock_acquired;
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acpi_status acpi_ev_acquire_global_lock(u16 timeout)
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{
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acpi_status status = AE_OK;
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u8 acquired = FALSE;
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ACPI_FUNCTION_TRACE(ev_acquire_global_lock);
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/*
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* Only one thread can acquire the GL at a time, the global_lock_mutex
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* enforces this. This interface releases the interpreter if we must wait.
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*/
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status = acpi_ex_system_wait_mutex(
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acpi_gbl_global_lock_mutex->mutex.os_mutex, 0);
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if (status == AE_TIME) {
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if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
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acpi_ev_global_lock_acquired++;
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return AE_OK;
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}
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}
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if (ACPI_FAILURE(status)) {
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status = acpi_ex_system_wait_mutex(
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acpi_gbl_global_lock_mutex->mutex.os_mutex,
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timeout);
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}
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
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acpi_ev_global_lock_acquired++;
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/*
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* Update the global lock handle and check for wraparound. The handle is
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* only used for the external global lock interfaces, but it is updated
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* here to properly handle the case where a single thread may acquire the
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* lock via both the AML and the acpi_acquire_global_lock interfaces. The
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* handle is therefore updated on the first acquire from a given thread
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* regardless of where the acquisition request originated.
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*/
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acpi_gbl_global_lock_handle++;
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if (acpi_gbl_global_lock_handle == 0) {
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acpi_gbl_global_lock_handle = 1;
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}
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/*
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* Make sure that a global lock actually exists. If not, just treat the
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* lock as a standard mutex.
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*/
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if (!acpi_gbl_global_lock_present) {
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acpi_gbl_global_lock_acquired = TRUE;
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return_ACPI_STATUS(AE_OK);
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}
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/* Attempt to acquire the actual hardware lock */
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ACPI_ACQUIRE_GLOBAL_LOCK(acpi_gbl_FACS, acquired);
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if (acquired) {
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/* We got the lock */
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Acquired hardware Global Lock\n"));
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acpi_gbl_global_lock_acquired = TRUE;
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Did not get the lock. The pending bit was set above, and we must now
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* wait until we get the global lock released interrupt.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Waiting for hardware Global Lock\n"));
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/*
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* Wait for handshake with the global lock interrupt handler.
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* This interface releases the interpreter if we must wait.
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*/
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status = acpi_ex_system_wait_semaphore(acpi_gbl_global_lock_semaphore,
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ACPI_WAIT_FOREVER);
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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_ev_release_global_lock
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Releases ownership of the Global Lock.
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*
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******************************************************************************/
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acpi_status acpi_ev_release_global_lock(void)
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{
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u8 pending = FALSE;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE(ev_release_global_lock);
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/* Lock must be already acquired */
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if (!acpi_gbl_global_lock_acquired) {
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ACPI_WARNING((AE_INFO,
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"Cannot release the ACPI Global Lock, it has not been acquired"));
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return_ACPI_STATUS(AE_NOT_ACQUIRED);
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}
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acpi_ev_global_lock_acquired--;
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if (acpi_ev_global_lock_acquired > 0) {
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return AE_OK;
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}
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if (acpi_gbl_global_lock_present) {
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/* Allow any thread to release the lock */
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ACPI_RELEASE_GLOBAL_LOCK(acpi_gbl_FACS, pending);
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/*
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* If the pending bit was set, we must write GBL_RLS to the control
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* register
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*/
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|
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 = NULL;
|
|
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 %d",
|
|
(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;
|
|
}
|