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9cd031441a
There are two problems with the ACPICA's current implementation of the global lock acquisition. First, acpi_ev_global_lock_handler(), which in fact is an interface to the outside of the kernel, doesn't validate its input, so it only works correctly if the other side (i.e. the ACPI firmware) is fully specification-compliant (as far as the global lock is concerned). Unfortunately, that's known not to be the case on some systems (i.e. we get spurious global lock signaling interrupts without the pending flag set on some systems). Second, acpi_ev_global_lock_handler() attempts to acquire the global lock on behalf of a thread waiting for it without checking if there actually is such a thread. Both of these shortcomings need to be addressed to prevent all possible race conditions from happening. Rework acpi_ev_global_lock_handler() so that it doesn't try to acquire the global lock and make it signal the availability of the global lock to the waiting thread instead. Make sure that the availability of the global lock can only be signaled when there is a thread waiting for it and that it can't be signaled more than once in a row (to keep acpi_gbl_global_lock_semaphore in balance). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
646 lines
18 KiB
C
646 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 - 2010, 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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struct acpi_object_notify_handler *notifier;
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notifier = &handler_obj->notify;
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while (notifier) {
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notifier->handler(notify_info->notify.node,
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notify_info->notify.value,
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notifier->context);
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notifier = notifier->next;
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}
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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. If there's a thread waiting for
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* the global lock, signal it.
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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 u8 acpi_ev_global_lock_pending;
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static spinlock_t _acpi_ev_global_lock_pending_lock;
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#define acpi_ev_global_lock_pending_lock &_acpi_ev_global_lock_pending_lock
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static u32 acpi_ev_global_lock_handler(void *context)
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{
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acpi_status status;
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acpi_cpu_flags flags;
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flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
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if (!acpi_ev_global_lock_pending) {
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goto out;
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}
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/* Send a unit to the semaphore */
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status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));
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}
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acpi_ev_global_lock_pending = FALSE;
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out:
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acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
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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_cpu_flags flags;
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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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flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
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do {
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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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acpi_gbl_global_lock_acquired = TRUE;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Acquired hardware Global Lock\n"));
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break;
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}
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acpi_ev_global_lock_pending = TRUE;
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acpi_os_release_lock(acpi_ev_global_lock_pending_lock, flags);
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/*
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* Did not get the lock. The pending bit was set above, and we
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* must wait until we get the global lock released interrupt.
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"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(
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acpi_gbl_global_lock_semaphore,
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ACPI_WAIT_FOREVER);
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flags = acpi_os_acquire_lock(acpi_ev_global_lock_pending_lock);
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} while (ACPI_SUCCESS(status));
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acpi_ev_global_lock_pending = FALSE;
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|
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;
|
|
}
|