static ACPI_STATUS
AcpiHwBuildPciList (
ACPI_HANDLE RootPciDevice,
ACPI_HANDLE PciRegion,
ACPI_PCI_DEVICE **ReturnListHead)
{
ACPI_HANDLE CurrentDevice;
ACPI_HANDLE ParentDevice;
ACPI_STATUS Status;
ACPI_PCI_DEVICE *ListElement;
ACPI_PCI_DEVICE *ListHead = NULL;
/*
* Ascend namespace branch until the RootPciDevice is reached, building
* a list of device nodes. Loop will exit when either the PCI device is
* found, or the root of the namespace is reached.
*/
CurrentDevice = PciRegion;
while (1)
{
Status = AcpiGetParent (CurrentDevice, &ParentDevice);
if (ACPI_FAILURE (Status))
{
/* Must delete the list before exit */
AcpiHwDeletePciList (*ReturnListHead);
return (Status);
}
/* Finished when we reach the PCI root device (PNP0A03 or PNP0A08) */
if (ParentDevice == RootPciDevice)
{
*ReturnListHead = ListHead;
return (AE_OK);
}
ListElement = ACPI_ALLOCATE (sizeof (ACPI_PCI_DEVICE));
if (!ListElement)
{
/* Must delete the list before exit */
AcpiHwDeletePciList (*ReturnListHead);
return (AE_NO_MEMORY);
}
/* Put new element at the head of the list */
ListElement->Next = ListHead;
ListElement->Device = ParentDevice;
ListHead = ListElement;
CurrentDevice = ParentDevice;
}
}
ACPI_STATUS
AcpiHwDerivePciId (
ACPI_PCI_ID *PciId,
ACPI_HANDLE RootPciDevice,
ACPI_HANDLE PciRegion)
{
ACPI_STATUS Status;
ACPI_PCI_DEVICE *ListHead;
ACPI_FUNCTION_TRACE (HwDerivePciId);
if (!PciId)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Build a list of PCI devices, from PciRegion up to RootPciDevice */
Status = AcpiHwBuildPciList (RootPciDevice, PciRegion, &ListHead);
if (ACPI_SUCCESS (Status))
{
/* Walk the list, updating the PCI device/function/bus numbers */
Status = AcpiHwProcessPciList (PciId, ListHead);
/* Delete the list */
AcpiHwDeletePciList (ListHead);
}
return_ACPI_STATUS (Status);
}
