361 lines
10 KiB
C
361 lines
10 KiB
C
/******************************************************************************
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*
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* Module Name: evgpeutil - GPE utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, 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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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evgpeutil")
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_walk_gpe_list
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*
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* PARAMETERS: gpe_walk_callback - Routine called for each GPE block
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* context - Value passed to callback
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*
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* RETURN: Status
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*
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* DESCRIPTION: Walk the GPE lists.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
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{
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struct acpi_gpe_block_info *gpe_block;
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struct acpi_gpe_xrupt_info *gpe_xrupt_info;
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acpi_status status = AE_OK;
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acpi_cpu_flags flags;
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ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
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flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
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/* Walk the interrupt level descriptor list */
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gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
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while (gpe_xrupt_info) {
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/* Walk all Gpe Blocks attached to this interrupt level */
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gpe_block = gpe_xrupt_info->gpe_block_list_head;
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while (gpe_block) {
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/* One callback per GPE block */
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status =
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gpe_walk_callback(gpe_xrupt_info, gpe_block,
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context);
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if (ACPI_FAILURE(status)) {
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if (status == AE_CTRL_END) { /* Callback abort */
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status = AE_OK;
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}
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goto unlock_and_exit;
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}
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gpe_block = gpe_block->next;
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}
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gpe_xrupt_info = gpe_xrupt_info->next;
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}
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unlock_and_exit:
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acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
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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_get_gpe_device
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*
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* PARAMETERS: GPE_WALK_CALLBACK
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*
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* RETURN: Status
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*
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* DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
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* block device. NULL if the GPE is one of the FADT-defined GPEs.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
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struct acpi_gpe_block_info *gpe_block, void *context)
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{
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struct acpi_gpe_device_info *info = context;
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/* Increment Index by the number of GPEs in this block */
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info->next_block_base_index += gpe_block->gpe_count;
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if (info->index < info->next_block_base_index) {
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/*
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* The GPE index is within this block, get the node. Leave the node
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* NULL for the FADT-defined GPEs
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*/
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if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
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info->gpe_device = gpe_block->node;
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}
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info->status = AE_OK;
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return (AE_CTRL_END);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_get_gpe_xrupt_block
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*
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* PARAMETERS: interrupt_number - Interrupt for a GPE block
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* gpe_xrupt_block - Where the block is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
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* block per unique interrupt level used for GPEs. Should be
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* called only when the GPE lists are semaphore locked and not
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* subject to change.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_get_gpe_xrupt_block(u32 interrupt_number,
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struct acpi_gpe_xrupt_info **gpe_xrupt_block)
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{
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struct acpi_gpe_xrupt_info *next_gpe_xrupt;
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struct acpi_gpe_xrupt_info *gpe_xrupt;
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acpi_status status;
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acpi_cpu_flags flags;
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ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
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/* No need for lock since we are not changing any list elements here */
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next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
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while (next_gpe_xrupt) {
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if (next_gpe_xrupt->interrupt_number == interrupt_number) {
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*gpe_xrupt_block = next_gpe_xrupt;
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return_ACPI_STATUS(AE_OK);
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}
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next_gpe_xrupt = next_gpe_xrupt->next;
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}
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/* Not found, must allocate a new xrupt descriptor */
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gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
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if (!gpe_xrupt) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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gpe_xrupt->interrupt_number = interrupt_number;
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/* Install new interrupt descriptor with spin lock */
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flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
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if (acpi_gbl_gpe_xrupt_list_head) {
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next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
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while (next_gpe_xrupt->next) {
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next_gpe_xrupt = next_gpe_xrupt->next;
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}
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next_gpe_xrupt->next = gpe_xrupt;
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gpe_xrupt->previous = next_gpe_xrupt;
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} else {
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acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
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}
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acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
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/* Install new interrupt handler if not SCI_INT */
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if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
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status = acpi_os_install_interrupt_handler(interrupt_number,
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acpi_ev_gpe_xrupt_handler,
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gpe_xrupt);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not install GPE interrupt handler at level 0x%X",
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interrupt_number));
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return_ACPI_STATUS(status);
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}
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}
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*gpe_xrupt_block = gpe_xrupt;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_delete_gpe_xrupt
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*
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* PARAMETERS: gpe_xrupt - A GPE interrupt info block
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*
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* RETURN: Status
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*
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* DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
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* interrupt handler if not the SCI interrupt.
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*
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******************************************************************************/
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acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
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{
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acpi_status status;
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acpi_cpu_flags flags;
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ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
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/* We never want to remove the SCI interrupt handler */
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if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
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gpe_xrupt->gpe_block_list_head = NULL;
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return_ACPI_STATUS(AE_OK);
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}
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/* Disable this interrupt */
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status =
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acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
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acpi_ev_gpe_xrupt_handler);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Unlink the interrupt block with lock */
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flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
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if (gpe_xrupt->previous) {
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gpe_xrupt->previous->next = gpe_xrupt->next;
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} else {
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/* No previous, update list head */
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acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
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}
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if (gpe_xrupt->next) {
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gpe_xrupt->next->previous = gpe_xrupt->previous;
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}
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acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
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/* Free the block */
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ACPI_FREE(gpe_xrupt);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_delete_gpe_handlers
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*
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* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
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* gpe_block - Gpe Block info
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*
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* RETURN: Status
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*
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* DESCRIPTION: Delete all Handler objects found in the GPE data structs.
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* Used only prior to termination.
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*
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******************************************************************************/
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acpi_status
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acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
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struct acpi_gpe_block_info *gpe_block,
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void *context)
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{
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struct acpi_gpe_event_info *gpe_event_info;
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struct acpi_gpe_notify_info *notify;
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struct acpi_gpe_notify_info *next;
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u32 i;
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u32 j;
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ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
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/* Examine each GPE Register within the block */
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for (i = 0; i < gpe_block->register_count; i++) {
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/* Now look at the individual GPEs in this byte register */
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for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
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gpe_event_info = &gpe_block->event_info[((acpi_size)i *
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ACPI_GPE_REGISTER_WIDTH)
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+ j];
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if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
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ACPI_GPE_DISPATCH_HANDLER) ||
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(ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
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ACPI_GPE_DISPATCH_RAW_HANDLER)) {
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/* Delete an installed handler block */
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ACPI_FREE(gpe_event_info->dispatch.handler);
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gpe_event_info->dispatch.handler = NULL;
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gpe_event_info->flags &=
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~ACPI_GPE_DISPATCH_MASK;
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} else if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)
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== ACPI_GPE_DISPATCH_NOTIFY) {
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/* Delete the implicit notification device list */
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notify = gpe_event_info->dispatch.notify_list;
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while (notify) {
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next = notify->next;
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ACPI_FREE(notify);
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notify = next;
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}
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gpe_event_info->dispatch.notify_list = NULL;
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gpe_event_info->flags &=
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~ACPI_GPE_DISPATCH_MASK;
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}
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}
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}
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return_ACPI_STATUS(AE_OK);
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}
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#endif /* !ACPI_REDUCED_HARDWARE */
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