528 lines
14 KiB
C
528 lines
14 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: evhandler - Support for Address Space handlers
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*
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* Copyright (C) 2000 - 2019, Intel Corp.
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*
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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("evhandler")
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/* Local prototypes */
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static acpi_status
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acpi_ev_install_handler(acpi_handle obj_handle,
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u32 level, void *context, void **return_value);
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/* These are the address spaces that will get default handlers */
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u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
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ACPI_ADR_SPACE_SYSTEM_MEMORY,
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ACPI_ADR_SPACE_SYSTEM_IO,
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ACPI_ADR_SPACE_PCI_CONFIG,
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ACPI_ADR_SPACE_DATA_TABLE
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};
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_install_region_handlers
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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: Installs the core subsystem default address space handlers.
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*
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******************************************************************************/
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acpi_status acpi_ev_install_region_handlers(void)
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{
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acpi_status status;
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u32 i;
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ACPI_FUNCTION_TRACE(ev_install_region_handlers);
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status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* All address spaces (PCI Config, EC, SMBus) are scope dependent and
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* registration must occur for a specific device.
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*
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* In the case of the system memory and IO address spaces there is
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* currently no device associated with the address space. For these we
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* use the root.
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*
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* We install the default PCI config space handler at the root so that
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* this space is immediately available even though the we have not
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* enumerated all the PCI Root Buses yet. This is to conform to the ACPI
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* specification which states that the PCI config space must be always
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* available -- even though we are nowhere near ready to find the PCI root
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* buses at this point.
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*
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* NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
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* has already been installed (via acpi_install_address_space_handler).
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* Similar for AE_SAME_HANDLER.
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*/
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for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
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status = acpi_ev_install_space_handler(acpi_gbl_root_node,
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acpi_gbl_default_address_spaces
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[i],
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ACPI_DEFAULT_HANDLER,
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NULL, NULL);
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switch (status) {
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case AE_OK:
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case AE_SAME_HANDLER:
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case AE_ALREADY_EXISTS:
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/* These exceptions are all OK */
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status = AE_OK;
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break;
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default:
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goto unlock_and_exit;
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}
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}
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
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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_has_default_handler
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*
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* PARAMETERS: node - Namespace node for the device
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* space_id - The address space ID
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*
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* RETURN: TRUE if default handler is installed, FALSE otherwise
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*
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* DESCRIPTION: Check if the default handler is installed for the requested
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* space ID.
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*
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******************************************************************************/
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u8
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acpi_ev_has_default_handler(struct acpi_namespace_node *node,
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acpi_adr_space_type space_id)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *handler_obj;
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/* Must have an existing internal object */
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obj_desc = acpi_ns_get_attached_object(node);
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if (obj_desc) {
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handler_obj = obj_desc->common_notify.handler;
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/* Walk the linked list of handlers for this object */
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while (handler_obj) {
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if (handler_obj->address_space.space_id == space_id) {
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if (handler_obj->address_space.handler_flags &
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ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
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return (TRUE);
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}
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}
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handler_obj = handler_obj->address_space.next;
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}
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_install_handler
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*
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* PARAMETERS: walk_namespace callback
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*
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* DESCRIPTION: This routine installs an address handler into objects that are
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* of type Region or Device.
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*
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* If the Object is a Device, and the device has a handler of
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* the same type then the search is terminated in that branch.
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*
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* This is because the existing handler is closer in proximity
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* to any more regions than the one we are trying to install.
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*
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******************************************************************************/
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static acpi_status
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acpi_ev_install_handler(acpi_handle obj_handle,
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u32 level, void *context, void **return_value)
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{
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union acpi_operand_object *handler_obj;
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union acpi_operand_object *next_handler_obj;
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union acpi_operand_object *obj_desc;
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struct acpi_namespace_node *node;
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acpi_status status;
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ACPI_FUNCTION_NAME(ev_install_handler);
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handler_obj = (union acpi_operand_object *)context;
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/* Parameter validation */
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if (!handler_obj) {
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return (AE_OK);
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}
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/* Convert and validate the device handle */
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node = acpi_ns_validate_handle(obj_handle);
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if (!node) {
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return (AE_BAD_PARAMETER);
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}
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/*
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* We only care about regions and objects that are allowed to have
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* address space handlers
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*/
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if ((node->type != ACPI_TYPE_DEVICE) &&
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(node->type != ACPI_TYPE_REGION) && (node != acpi_gbl_root_node)) {
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return (AE_OK);
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}
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/* Check for an existing internal object */
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obj_desc = acpi_ns_get_attached_object(node);
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if (!obj_desc) {
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/* No object, just exit */
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return (AE_OK);
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}
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/* Devices are handled different than regions */
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if (obj_desc->common.type == ACPI_TYPE_DEVICE) {
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/* Check if this Device already has a handler for this address space */
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next_handler_obj =
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acpi_ev_find_region_handler(handler_obj->address_space.
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space_id,
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obj_desc->common_notify.
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handler);
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if (next_handler_obj) {
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/* Found a handler, is it for the same address space? */
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Found handler for region [%s] in device %p(%p) handler %p\n",
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acpi_ut_get_region_name(handler_obj->
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address_space.
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space_id),
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obj_desc, next_handler_obj,
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handler_obj));
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/*
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* Since the object we found it on was a device, then it means
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* that someone has already installed a handler for the branch
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* of the namespace from this device on. Just bail out telling
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* the walk routine to not traverse this branch. This preserves
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* the scoping rule for handlers.
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*/
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return (AE_CTRL_DEPTH);
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}
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/*
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* As long as the device didn't have a handler for this space we
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* don't care about it. We just ignore it and proceed.
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*/
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return (AE_OK);
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}
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/* Object is a Region */
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if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
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/* This region is for a different address space, just ignore it */
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return (AE_OK);
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}
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/*
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* Now we have a region and it is for the handler's address space type.
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*
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* First disconnect region for any previous handler (if any)
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*/
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acpi_ev_detach_region(obj_desc, FALSE);
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/* Connect the region to the new handler */
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status = acpi_ev_attach_region(handler_obj, obj_desc, FALSE);
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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_find_region_handler
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*
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* PARAMETERS: space_id - The address space ID
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* handler_obj - Head of the handler object list
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*
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* RETURN: Matching handler object. NULL if space ID not matched
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*
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* DESCRIPTION: Search a handler object list for a match on the address
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* space ID.
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*
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******************************************************************************/
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union acpi_operand_object *acpi_ev_find_region_handler(acpi_adr_space_type
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space_id,
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union acpi_operand_object
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*handler_obj)
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{
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/* Walk the handler list for this device */
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while (handler_obj) {
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/* Same space_id indicates a handler is installed */
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if (handler_obj->address_space.space_id == space_id) {
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return (handler_obj);
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}
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/* Next handler object */
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handler_obj = handler_obj->address_space.next;
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}
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return (NULL);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_install_space_handler
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*
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* PARAMETERS: node - Namespace node for the device
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* space_id - The address space ID
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* handler - Address of the handler
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* setup - Address of the setup function
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* context - Value passed to the handler on each access
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*
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* RETURN: Status
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*
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* DESCRIPTION: Install a handler for all op_regions of a given space_id.
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* Assumes namespace is locked
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*
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******************************************************************************/
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acpi_status
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acpi_ev_install_space_handler(struct acpi_namespace_node *node,
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acpi_adr_space_type space_id,
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acpi_adr_space_handler handler,
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acpi_adr_space_setup setup, void *context)
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{
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union acpi_operand_object *obj_desc;
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union acpi_operand_object *handler_obj;
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acpi_status status = AE_OK;
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acpi_object_type type;
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u8 flags = 0;
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ACPI_FUNCTION_TRACE(ev_install_space_handler);
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/*
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* This registration is valid for only the types below and the root.
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* The root node is where the default handlers get installed.
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*/
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if ((node->type != ACPI_TYPE_DEVICE) &&
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(node->type != ACPI_TYPE_PROCESSOR) &&
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(node->type != ACPI_TYPE_THERMAL) && (node != acpi_gbl_root_node)) {
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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if (handler == ACPI_DEFAULT_HANDLER) {
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flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
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switch (space_id) {
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case ACPI_ADR_SPACE_SYSTEM_MEMORY:
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handler = acpi_ex_system_memory_space_handler;
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setup = acpi_ev_system_memory_region_setup;
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break;
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case ACPI_ADR_SPACE_SYSTEM_IO:
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handler = acpi_ex_system_io_space_handler;
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setup = acpi_ev_io_space_region_setup;
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break;
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#ifdef ACPI_PCI_CONFIGURED
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case ACPI_ADR_SPACE_PCI_CONFIG:
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handler = acpi_ex_pci_config_space_handler;
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setup = acpi_ev_pci_config_region_setup;
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break;
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#endif
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case ACPI_ADR_SPACE_CMOS:
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handler = acpi_ex_cmos_space_handler;
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setup = acpi_ev_cmos_region_setup;
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break;
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#ifdef ACPI_PCI_CONFIGURED
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case ACPI_ADR_SPACE_PCI_BAR_TARGET:
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handler = acpi_ex_pci_bar_space_handler;
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setup = acpi_ev_pci_bar_region_setup;
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break;
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#endif
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case ACPI_ADR_SPACE_DATA_TABLE:
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handler = acpi_ex_data_table_space_handler;
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setup = NULL;
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break;
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default:
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status = AE_BAD_PARAMETER;
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goto unlock_and_exit;
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}
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}
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/* If the caller hasn't specified a setup routine, use the default */
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if (!setup) {
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setup = acpi_ev_default_region_setup;
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}
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/* Check for an existing internal object */
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obj_desc = acpi_ns_get_attached_object(node);
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if (obj_desc) {
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/*
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* The attached device object already exists. Now make sure
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* the handler is not already installed.
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*/
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handler_obj = acpi_ev_find_region_handler(space_id,
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obj_desc->
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common_notify.
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handler);
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if (handler_obj) {
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if (handler_obj->address_space.handler == handler) {
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/*
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* It is (relatively) OK to attempt to install the SAME
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* handler twice. This can easily happen with the
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* PCI_Config space.
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*/
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status = AE_SAME_HANDLER;
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goto unlock_and_exit;
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} else {
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/* A handler is already installed */
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status = AE_ALREADY_EXISTS;
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}
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goto unlock_and_exit;
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}
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} else {
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Creating object on Device %p while installing handler\n",
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node));
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/* obj_desc does not exist, create one */
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if (node->type == ACPI_TYPE_ANY) {
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type = ACPI_TYPE_DEVICE;
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} else {
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type = node->type;
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}
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obj_desc = acpi_ut_create_internal_object(type);
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if (!obj_desc) {
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status = AE_NO_MEMORY;
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goto unlock_and_exit;
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}
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/* Init new descriptor */
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obj_desc->common.type = (u8)type;
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/* Attach the new object to the Node */
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status = acpi_ns_attach_object(node, obj_desc, type);
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/* Remove local reference to the object */
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acpi_ut_remove_reference(obj_desc);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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}
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Installing address handler for region %s(%X) "
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"on Device %4.4s %p(%p)\n",
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acpi_ut_get_region_name(space_id), space_id,
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acpi_ut_get_node_name(node), node, obj_desc));
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/*
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* Install the handler
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*
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* At this point there is no existing handler. Just allocate the object
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* for the handler and link it into the list.
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*/
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handler_obj =
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acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
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if (!handler_obj) {
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status = AE_NO_MEMORY;
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goto unlock_and_exit;
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}
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/* Init handler obj */
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handler_obj->address_space.space_id = (u8)space_id;
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handler_obj->address_space.handler_flags = flags;
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handler_obj->address_space.region_list = NULL;
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handler_obj->address_space.node = node;
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handler_obj->address_space.handler = handler;
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handler_obj->address_space.context = context;
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handler_obj->address_space.setup = setup;
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/* Install at head of Device.address_space list */
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handler_obj->address_space.next = obj_desc->common_notify.handler;
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/*
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* The Device object is the first reference on the handler_obj.
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* Each region that uses the handler adds a reference.
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*/
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obj_desc->common_notify.handler = handler_obj;
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/*
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* Walk the namespace finding all of the regions this handler will
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* manage.
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*
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* Start at the device and search the branch toward the leaf nodes
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* until either the leaf is encountered or a device is detected that
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* has an address handler of the same type.
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*
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* In either case, back up and search down the remainder of the branch
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*/
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status = acpi_ns_walk_namespace(ACPI_TYPE_ANY, node,
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ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
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acpi_ev_install_handler, NULL,
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handler_obj, NULL);
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unlock_and_exit:
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return_ACPI_STATUS(status);
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}
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