/******************************************************************************* * * Module Name: hwpci - Obtain PCI bus, device, and function numbers * ******************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * ***************************************************************************** * * Alternatively, you may choose to be licensed under the terms of the * following license: * * 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. * * 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 MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * 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 DAMAGE. * * Alternatively, you may choose to be licensed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * *****************************************************************************/ #include #include #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); }