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68aafc3516
1) Ensure that all functions that use the various TRACE macros also use the appropriate ACPICA return macros. 2) Ensure that all normal return statements surround the return expression (value) with parens. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
413 lines
13 KiB
C
413 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 - 2012, 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 = NULL;
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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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}
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/* Always delete the list */
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acpi_hw_delete_pci_list(list_head);
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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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struct acpi_pci_device *list_head = NULL;
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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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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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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_list_head = list_head;
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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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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 = list_head;
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list_element->device = parent_device;
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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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