| /******************************************************************************* |
| * |
| * Module Name: hwpci - Obtain PCI bus, device, and function numbers |
| * |
| ******************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2016, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include "acpi.h" |
| #include "accommon.h" |
| |
| |
| #define _COMPONENT ACPI_NAMESPACE |
| ACPI_MODULE_NAME ("hwpci") |
| |
| |
| /* PCI configuration space values */ |
| |
| #define PCI_CFG_HEADER_TYPE_REG 0x0E |
| #define PCI_CFG_PRIMARY_BUS_NUMBER_REG 0x18 |
| #define PCI_CFG_SECONDARY_BUS_NUMBER_REG 0x19 |
| |
| /* PCI header values */ |
| |
| #define PCI_HEADER_TYPE_MASK 0x7F |
| #define PCI_TYPE_BRIDGE 0x01 |
| #define PCI_TYPE_CARDBUS_BRIDGE 0x02 |
| |
| typedef struct acpi_pci_device |
| { |
| ACPI_HANDLE Device; |
| struct acpi_pci_device *Next; |
| |
| } ACPI_PCI_DEVICE; |
| |
| |
| /* Local prototypes */ |
| |
| static ACPI_STATUS |
| AcpiHwBuildPciList ( |
| ACPI_HANDLE RootPciDevice, |
| ACPI_HANDLE PciRegion, |
| ACPI_PCI_DEVICE **ReturnListHead); |
| |
| static ACPI_STATUS |
| AcpiHwProcessPciList ( |
| ACPI_PCI_ID *PciId, |
| ACPI_PCI_DEVICE *ListHead); |
| |
| static void |
| AcpiHwDeletePciList ( |
| ACPI_PCI_DEVICE *ListHead); |
| |
| static ACPI_STATUS |
| AcpiHwGetPciDeviceInfo ( |
| ACPI_PCI_ID *PciId, |
| ACPI_HANDLE PciDevice, |
| UINT16 *BusNumber, |
| BOOLEAN *IsBridge); |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiHwDerivePciId |
| * |
| * PARAMETERS: PciId - Initial values for the PCI ID. May be |
| * modified by this function. |
| * RootPciDevice - A handle to a PCI device object. This |
| * object must be a PCI Root Bridge having a |
| * _HID value of either PNP0A03 or PNP0A08 |
| * PciRegion - A handle to a PCI configuration space |
| * Operation Region being initialized |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: This function derives a full PCI ID for a PCI device, |
| * consisting of a Segment number, Bus number, Device number, |
| * and function code. |
| * |
| * The PCI hardware dynamically configures PCI bus numbers |
| * depending on the bus topology discovered during system |
| * initialization. This function is invoked during configuration |
| * of a PCI_Config Operation Region in order to (possibly) update |
| * the Bus/Device/Function numbers in the PciId with the actual |
| * values as determined by the hardware and operating system |
| * configuration. |
| * |
| * The PciId parameter is initially populated during the Operation |
| * Region initialization. This function is then called, and is |
| * will make any necessary modifications to the Bus, Device, or |
| * Function number PCI ID subfields as appropriate for the |
| * current hardware and OS configuration. |
| * |
| * NOTE: Created 08/2010. Replaces the previous OSL AcpiOsDerivePciId |
| * interface since this feature is OS-independent. This module |
| * specifically avoids any use of recursion by building a local |
| * temporary device list. |
| * |
| ******************************************************************************/ |
| |
| 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); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiHwBuildPciList |
| * |
| * PARAMETERS: RootPciDevice - A handle to a PCI device object. This |
| * object is guaranteed to be a PCI Root |
| * Bridge having a _HID value of either |
| * PNP0A03 or PNP0A08 |
| * PciRegion - A handle to the PCI configuration space |
| * Operation Region |
| * ReturnListHead - Where the PCI device list is returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Builds a list of devices from the input PCI region up to the |
| * Root PCI device for this namespace subtree. |
| * |
| ******************************************************************************/ |
| |
| 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; |
| |
| |
| /* |
| * 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. |
| */ |
| *ReturnListHead = NULL; |
| 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) |
| { |
| 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 = *ReturnListHead; |
| ListElement->Device = ParentDevice; |
| *ReturnListHead = ListElement; |
| |
| CurrentDevice = ParentDevice; |
| } |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiHwProcessPciList |
| * |
| * PARAMETERS: PciId - Initial values for the PCI ID. May be |
| * modified by this function. |
| * ListHead - Device list created by |
| * AcpiHwBuildPciList |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Walk downward through the PCI device list, getting the device |
| * info for each, via the PCI configuration space and updating |
| * the PCI ID as necessary. Deletes the list during traversal. |
| * |
| ******************************************************************************/ |
| |
| static ACPI_STATUS |
| AcpiHwProcessPciList ( |
| ACPI_PCI_ID *PciId, |
| ACPI_PCI_DEVICE *ListHead) |
| { |
| ACPI_STATUS Status = AE_OK; |
| ACPI_PCI_DEVICE *Info; |
| UINT16 BusNumber; |
| BOOLEAN IsBridge = TRUE; |
| |
| |
| ACPI_FUNCTION_NAME (HwProcessPciList); |
| |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, |
| "Input PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X\n", |
| PciId->Segment, PciId->Bus, PciId->Device, PciId->Function)); |
| |
| BusNumber = PciId->Bus; |
| |
| /* |
| * Descend down the namespace tree, collecting PCI device, function, |
| * and bus numbers. BusNumber is only important for PCI bridges. |
| * Algorithm: As we descend the tree, use the last valid PCI device, |
| * function, and bus numbers that are discovered, and assign them |
| * to the PCI ID for the target device. |
| */ |
| Info = ListHead; |
| while (Info) |
| { |
| Status = AcpiHwGetPciDeviceInfo (PciId, Info->Device, |
| &BusNumber, &IsBridge); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| |
| Info = Info->Next; |
| } |
| |
| ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, |
| "Output PciId: Seg %4.4X Bus %4.4X Dev %4.4X Func %4.4X " |
| "Status %X BusNumber %X IsBridge %X\n", |
| PciId->Segment, PciId->Bus, PciId->Device, PciId->Function, |
| Status, BusNumber, IsBridge)); |
| |
| return (AE_OK); |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiHwDeletePciList |
| * |
| * PARAMETERS: ListHead - Device list created by |
| * AcpiHwBuildPciList |
| * |
| * RETURN: None |
| * |
| * DESCRIPTION: Free the entire PCI list. |
| * |
| ******************************************************************************/ |
| |
| static void |
| AcpiHwDeletePciList ( |
| ACPI_PCI_DEVICE *ListHead) |
| { |
| ACPI_PCI_DEVICE *Next; |
| ACPI_PCI_DEVICE *Previous; |
| |
| |
| Next = ListHead; |
| while (Next) |
| { |
| Previous = Next; |
| Next = Previous->Next; |
| ACPI_FREE (Previous); |
| } |
| } |
| |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: AcpiHwGetPciDeviceInfo |
| * |
| * PARAMETERS: PciId - Initial values for the PCI ID. May be |
| * modified by this function. |
| * PciDevice - Handle for the PCI device object |
| * BusNumber - Where a PCI bridge bus number is returned |
| * IsBridge - Return value, indicates if this PCI |
| * device is a PCI bridge |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Get the device info for a single PCI device object. Get the |
| * _ADR (contains PCI device and function numbers), and for PCI |
| * bridge devices, get the bus number from PCI configuration |
| * space. |
| * |
| ******************************************************************************/ |
| |
| static ACPI_STATUS |
| AcpiHwGetPciDeviceInfo ( |
| ACPI_PCI_ID *PciId, |
| ACPI_HANDLE PciDevice, |
| UINT16 *BusNumber, |
| BOOLEAN *IsBridge) |
| { |
| ACPI_STATUS Status; |
| ACPI_OBJECT_TYPE ObjectType; |
| UINT64 ReturnValue; |
| UINT64 PciValue; |
| |
| |
| /* We only care about objects of type Device */ |
| |
| Status = AcpiGetType (PciDevice, &ObjectType); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| |
| if (ObjectType != ACPI_TYPE_DEVICE) |
| { |
| return (AE_OK); |
| } |
| |
| /* We need an _ADR. Ignore device if not present */ |
| |
| Status = AcpiUtEvaluateNumericObject (METHOD_NAME__ADR, |
| PciDevice, &ReturnValue); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (AE_OK); |
| } |
| |
| /* |
| * From _ADR, get the PCI Device and Function and |
| * update the PCI ID. |
| */ |
| PciId->Device = ACPI_HIWORD (ACPI_LODWORD (ReturnValue)); |
| PciId->Function = ACPI_LOWORD (ACPI_LODWORD (ReturnValue)); |
| |
| /* |
| * If the previous device was a bridge, use the previous |
| * device bus number |
| */ |
| if (*IsBridge) |
| { |
| PciId->Bus = *BusNumber; |
| } |
| |
| /* |
| * Get the bus numbers from PCI Config space: |
| * |
| * First, get the PCI HeaderType |
| */ |
| *IsBridge = FALSE; |
| Status = AcpiOsReadPciConfiguration (PciId, |
| PCI_CFG_HEADER_TYPE_REG, &PciValue, 8); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| |
| /* We only care about bridges (1=PciBridge, 2=CardBusBridge) */ |
| |
| PciValue &= PCI_HEADER_TYPE_MASK; |
| |
| if ((PciValue != PCI_TYPE_BRIDGE) && |
| (PciValue != PCI_TYPE_CARDBUS_BRIDGE)) |
| { |
| return (AE_OK); |
| } |
| |
| /* Bridge: Get the Primary BusNumber */ |
| |
| Status = AcpiOsReadPciConfiguration (PciId, |
| PCI_CFG_PRIMARY_BUS_NUMBER_REG, &PciValue, 8); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| |
| *IsBridge = TRUE; |
| PciId->Bus = (UINT16) PciValue; |
| |
| /* Bridge: Get the Secondary BusNumber */ |
| |
| Status = AcpiOsReadPciConfiguration (PciId, |
| PCI_CFG_SECONDARY_BUS_NUMBER_REG, &PciValue, 8); |
| if (ACPI_FAILURE (Status)) |
| { |
| return (Status); |
| } |
| |
| *BusNumber = (UINT16) PciValue; |
| return (AE_OK); |
| } |
