421 lines
13 KiB
C
421 lines
13 KiB
C
/*******************************************************************************
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*
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* Module Name: hwpci - Obtain PCI bus, device, and function numbers
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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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#define _COMPONENT ACPI_NAMESPACE
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ACPI_MODULE_NAME("hwpci")
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/* PCI configuration space values */
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#define PCI_CFG_HEADER_TYPE_REG 0x0E
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#define PCI_CFG_PRIMARY_BUS_NUMBER_REG 0x18
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#define PCI_CFG_SECONDARY_BUS_NUMBER_REG 0x19
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/* PCI header values */
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#define PCI_HEADER_TYPE_MASK 0x7F
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#define PCI_TYPE_BRIDGE 0x01
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#define PCI_TYPE_CARDBUS_BRIDGE 0x02
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typedef struct acpi_pci_device {
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acpi_handle device;
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struct acpi_pci_device *next;
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} acpi_pci_device;
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/* Local prototypes */
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static acpi_status
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acpi_hw_build_pci_list(acpi_handle root_pci_device,
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acpi_handle pci_region,
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struct acpi_pci_device **return_list_head);
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static acpi_status
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acpi_hw_process_pci_list(struct acpi_pci_id *pci_id,
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struct acpi_pci_device *list_head);
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static void acpi_hw_delete_pci_list(struct acpi_pci_device *list_head);
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static acpi_status
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acpi_hw_get_pci_device_info(struct acpi_pci_id *pci_id,
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acpi_handle pci_device,
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u16 *bus_number, u8 *is_bridge);
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_derive_pci_id
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*
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* PARAMETERS: pci_id - Initial values for the PCI ID. May be
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* modified by this function.
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* root_pci_device - A handle to a PCI device object. This
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* object must be a PCI Root Bridge having a
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* _HID value of either PNP0A03 or PNP0A08
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* pci_region - A handle to a PCI configuration space
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* Operation Region being initialized
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function derives a full PCI ID for a PCI device,
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* consisting of a Segment number, Bus number, Device number,
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* and function code.
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*
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* The PCI hardware dynamically configures PCI bus numbers
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* depending on the bus topology discovered during system
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* initialization. This function is invoked during configuration
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* of a PCI_Config Operation Region in order to (possibly) update
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* the Bus/Device/Function numbers in the pci_id with the actual
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* values as determined by the hardware and operating system
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* configuration.
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*
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* The pci_id parameter is initially populated during the Operation
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* Region initialization. This function is then called, and is
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* will make any necessary modifications to the Bus, Device, or
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* Function number PCI ID subfields as appropriate for the
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* current hardware and OS configuration.
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*
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* NOTE: Created 08/2010. Replaces the previous OSL acpi_os_derive_pci_id
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* interface since this feature is OS-independent. This module
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* specifically avoids any use of recursion by building a local
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* temporary device list.
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*
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******************************************************************************/
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acpi_status
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acpi_hw_derive_pci_id(struct acpi_pci_id *pci_id,
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acpi_handle root_pci_device, acpi_handle pci_region)
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{
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acpi_status status;
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struct acpi_pci_device *list_head;
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ACPI_FUNCTION_TRACE(hw_derive_pci_id);
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if (!pci_id) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Build a list of PCI devices, from pci_region up to root_pci_device */
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status =
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acpi_hw_build_pci_list(root_pci_device, pci_region, &list_head);
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if (ACPI_SUCCESS(status)) {
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/* Walk the list, updating the PCI device/function/bus numbers */
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status = acpi_hw_process_pci_list(pci_id, list_head);
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/* Delete the list */
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acpi_hw_delete_pci_list(list_head);
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}
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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_hw_build_pci_list
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*
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* PARAMETERS: root_pci_device - A handle to a PCI device object. This
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* object is guaranteed to be a PCI Root
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* Bridge having a _HID value of either
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* PNP0A03 or PNP0A08
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* pci_region - A handle to the PCI configuration space
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* Operation Region
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* return_list_head - Where the PCI device list is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Builds a list of devices from the input PCI region up to the
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* Root PCI device for this namespace subtree.
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*
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******************************************************************************/
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static acpi_status
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acpi_hw_build_pci_list(acpi_handle root_pci_device,
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acpi_handle pci_region,
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struct acpi_pci_device **return_list_head)
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{
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acpi_handle current_device;
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acpi_handle parent_device;
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acpi_status status;
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struct acpi_pci_device *list_element;
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/*
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* Ascend namespace branch until the root_pci_device is reached, building
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* a list of device nodes. Loop will exit when either the PCI device is
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* found, or the root of the namespace is reached.
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*/
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*return_list_head = NULL;
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current_device = pci_region;
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while (1) {
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status = acpi_get_parent(current_device, &parent_device);
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if (ACPI_FAILURE(status)) {
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/* Must delete the list before exit */
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acpi_hw_delete_pci_list(*return_list_head);
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return (status);
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}
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/* Finished when we reach the PCI root device (PNP0A03 or PNP0A08) */
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if (parent_device == root_pci_device) {
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return (AE_OK);
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}
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list_element = ACPI_ALLOCATE(sizeof(struct acpi_pci_device));
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if (!list_element) {
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/* Must delete the list before exit */
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acpi_hw_delete_pci_list(*return_list_head);
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return (AE_NO_MEMORY);
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}
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/* Put new element at the head of the list */
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list_element->next = *return_list_head;
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list_element->device = parent_device;
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*return_list_head = list_element;
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current_device = parent_device;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_process_pci_list
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*
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* PARAMETERS: pci_id - Initial values for the PCI ID. May be
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* modified by this function.
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* list_head - Device list created by
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* acpi_hw_build_pci_list
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*
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* RETURN: Status
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*
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* DESCRIPTION: Walk downward through the PCI device list, getting the device
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* info for each, via the PCI configuration space and updating
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* the PCI ID as necessary. Deletes the list during traversal.
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*
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******************************************************************************/
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static acpi_status
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acpi_hw_process_pci_list(struct acpi_pci_id *pci_id,
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struct acpi_pci_device *list_head)
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{
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acpi_status status = AE_OK;
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struct acpi_pci_device *info;
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u16 bus_number;
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u8 is_bridge = TRUE;
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ACPI_FUNCTION_NAME(hw_process_pci_list);
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Input PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X\n",
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pci_id->segment, pci_id->bus, pci_id->device,
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pci_id->function));
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bus_number = pci_id->bus;
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/*
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* Descend down the namespace tree, collecting PCI device, function,
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* and bus numbers. bus_number is only important for PCI bridges.
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* Algorithm: As we descend the tree, use the last valid PCI device,
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* function, and bus numbers that are discovered, and assign them
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* to the PCI ID for the target device.
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*/
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info = list_head;
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while (info) {
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status = acpi_hw_get_pci_device_info(pci_id, info->device,
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&bus_number, &is_bridge);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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info = info->next;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
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"Output PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X "
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"Status %X BusNumber %X IsBridge %X\n",
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pci_id->segment, pci_id->bus, pci_id->device,
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pci_id->function, status, bus_number, is_bridge));
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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_hw_delete_pci_list
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*
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* PARAMETERS: list_head - Device list created by
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* acpi_hw_build_pci_list
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*
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* RETURN: None
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*
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* DESCRIPTION: Free the entire PCI list.
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*
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******************************************************************************/
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static void acpi_hw_delete_pci_list(struct acpi_pci_device *list_head)
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{
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struct acpi_pci_device *next;
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struct acpi_pci_device *previous;
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next = list_head;
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while (next) {
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previous = next;
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next = previous->next;
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ACPI_FREE(previous);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_get_pci_device_info
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*
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* PARAMETERS: pci_id - Initial values for the PCI ID. May be
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* modified by this function.
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* pci_device - Handle for the PCI device object
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* bus_number - Where a PCI bridge bus number is returned
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* is_bridge - Return value, indicates if this PCI
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* device is a PCI bridge
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get the device info for a single PCI device object. Get the
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* _ADR (contains PCI device and function numbers), and for PCI
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* bridge devices, get the bus number from PCI configuration
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* space.
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*
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******************************************************************************/
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static acpi_status
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acpi_hw_get_pci_device_info(struct acpi_pci_id *pci_id,
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acpi_handle pci_device,
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u16 *bus_number, u8 *is_bridge)
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{
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acpi_status status;
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acpi_object_type object_type;
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u64 return_value;
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u64 pci_value;
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/* We only care about objects of type Device */
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status = acpi_get_type(pci_device, &object_type);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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if (object_type != ACPI_TYPE_DEVICE) {
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return (AE_OK);
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}
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/* We need an _ADR. Ignore device if not present */
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status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR,
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pci_device, &return_value);
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if (ACPI_FAILURE(status)) {
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return (AE_OK);
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}
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/*
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* From _ADR, get the PCI Device and Function and
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* update the PCI ID.
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*/
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pci_id->device = ACPI_HIWORD(ACPI_LODWORD(return_value));
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pci_id->function = ACPI_LOWORD(ACPI_LODWORD(return_value));
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/*
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* If the previous device was a bridge, use the previous
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* device bus number
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*/
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if (*is_bridge) {
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pci_id->bus = *bus_number;
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}
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/*
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* Get the bus numbers from PCI Config space:
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*
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* First, get the PCI header_type
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*/
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*is_bridge = FALSE;
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status = acpi_os_read_pci_configuration(pci_id,
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PCI_CFG_HEADER_TYPE_REG,
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&pci_value, 8);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* We only care about bridges (1=pci_bridge, 2=card_bus_bridge) */
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pci_value &= PCI_HEADER_TYPE_MASK;
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if ((pci_value != PCI_TYPE_BRIDGE) &&
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(pci_value != PCI_TYPE_CARDBUS_BRIDGE)) {
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return (AE_OK);
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}
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/* Bridge: Get the Primary bus_number */
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status = acpi_os_read_pci_configuration(pci_id,
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PCI_CFG_PRIMARY_BUS_NUMBER_REG,
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&pci_value, 8);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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*is_bridge = TRUE;
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pci_id->bus = (u16)pci_value;
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/* Bridge: Get the Secondary bus_number */
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status = acpi_os_read_pci_configuration(pci_id,
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PCI_CFG_SECONDARY_BUS_NUMBER_REG,
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&pci_value, 8);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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*bus_number = (u16)pci_value;
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return (AE_OK);
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}
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