On Fri, Mar 17, 2023 at 12:20:05 +0530, Abdul Lateef Attar via groups.io wrote:
> Adds PCI hotplug init protocol implementation.
What are some notable aspects of this initial implementation?
What groups of platforms is it intended to cover?
> Signed-off-by: Abdul Lateef Attar <abdat...@amd.com>
> Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
> Cc: Leif Lindholm <quic_llind...@quicinc.com>
> Cc: Abner Chang <abner.ch...@amd.com>
> Cc: Michael D Kinney <michael.d.kin...@intel.com>
> ---
> Platform/AMD/PlatformPkg/PlatformPkg.dec | 16 +
> Platform/AMD/PlatformPkg/PlatformPkg.dsc | 23 ++
> .../PlatformPkg/PciHotPlug/PciHotPlugInit.inf | 41 +++
> .../PlatformPkg/PciHotPlug/PciHotPlugInit.c | 340 ++++++++++++++++++
> 4 files changed, 420 insertions(+)
> create mode 100644 Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.inf
> create mode 100644 Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.c
>
> diff --git a/Platform/AMD/PlatformPkg/PlatformPkg.dec
> b/Platform/AMD/PlatformPkg/PlatformPkg.dec
> index 6155860979cb..1bc38d6025c3 100644
> --- a/Platform/AMD/PlatformPkg/PlatformPkg.dec
> +++ b/Platform/AMD/PlatformPkg/PlatformPkg.dec
> @@ -13,3 +13,19 @@ [Defines]
> PACKAGE_NAME = PlatformPkg
> PACKAGE_GUID = 38FBA311-E2AA-4620-9A90-9A23753D1878
> PACKAGE_VERSION = 0.1
> +
> +[Guids]
> + gPlatformPkgTokenSpaceGuid = { 0x95ECA58D, 0x09B6, 0x4420, { 0xB4,
> 0xE7, 0x01, 0x7F, 0x6A, 0x5B, 0x26, 0x0F }}
> +
> +[PcdsDynamic, PcdsDynamicEx]
> + #
> + # PCI HotPlug Resource Padding
> + #
> + # IO Resource padding in bytes, default 4KB
> +
> gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadIO|0x00001000|UINT64|0x10000000
> + # PreFetch Memory padding in bytes, default 2MB
> +
> gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadPMem|0x00200000|UINT64|0x10000001
> + # Non-PreFetch Memory padding in bytes, default 1MB
> +
> gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadMem|0x00100000|UINT64|0x10000002
> + # PCI bus padding, number of bus to reserve, default 2 bus
> + gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadBus|2|UINT8|0x10000003
> diff --git a/Platform/AMD/PlatformPkg/PlatformPkg.dsc
> b/Platform/AMD/PlatformPkg/PlatformPkg.dsc
> index 704566b9ea73..9a693070ab3f 100644
> --- a/Platform/AMD/PlatformPkg/PlatformPkg.dsc
> +++ b/Platform/AMD/PlatformPkg/PlatformPkg.dsc
> @@ -16,5 +16,28 @@ [Defines]
> BUILD_TARGETS = DEBUG | RELEASE | NOOPT
> SUPPORTED_ARCHITECTURES = IA32 | X64
>
> +
Please don't add spurious whitespaces.
> [Packages]
> PlatformPkg/PlatformPkg.dec
> + MdeModulePkg/MdeModulePkg.dec
> + MdePkg/MdePkg.dec
I won't be maintaining this code, but I generally advocate sorting
these types of enumerations alphabetically in order to speed up reading.
(That's not really possible for the block below.)
> +
> +[LibraryClasses.Common]
> +
> UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf
> +
> UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
> + DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
> +
> MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
> + BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
> + BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
> + PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
> +
> RegisterFilterLib|MdePkg/Library/RegisterFilterLibNull/RegisterFilterLibNull.inf
> +
> SerialPortLib|MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.inf
> + PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
> +
> DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
> + IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
> +
> PlatformHookLib|MdeModulePkg/Library/BasePlatformHookLibNull/BasePlatformHookLibNull.inf
> + PciLib|MdePkg/Library/BasePciLibPciExpress/BasePciLibPciExpress.inf
> + PciExpressLib|MdePkg/Library/BasePciExpressLib/BasePciExpressLib.inf
> +
> +[Components.X64]
> + PlatformPkg/PciHotPlug/PciHotPlugInit.inf
> diff --git a/Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.inf
> b/Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.inf
> new file mode 100644
> index 000000000000..0079c4acf14e
> --- /dev/null
> +++ b/Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.inf
> @@ -0,0 +1,41 @@
> +## @file
> +# This driver implements EFI_PCI_HOT_PLUG_INIT_PROTOCOL.
> +# Adds resource padding information, for PCIe hotplug purposes.
> +#
> +# Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +
> +[Defines]
> + INF_VERSION = 1.29
> + BASE_NAME = PciHotPlugInit
> + FILE_GUID = 8B67D95F-78B7-484F-8F16-5F22AB388B0C
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 0.1
> + ENTRY_POINT = PciHotPlugInitialize
> +
> +[Sources]
> + PciHotPlugInit.c
> +
> +[Packages]
> + MdeModulePkg/MdeModulePkg.dec
> + MdePkg/MdePkg.dec
> + PlatformPkg/PlatformPkg.dec
But these would benefit from sorting
> +
> +[LibraryClasses]
> + UefiDriverEntryPoint
> + UefiBootServicesTableLib
> + DebugLib
> + MemoryAllocationLib
And these
> +
> +[Protocols]
> + gEfiPciHotPlugInitProtocolGuid
> +
> +[Pcd]
> + gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadIO
> + gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadPMem
> + gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadMem
> + gPlatformPkgTokenSpaceGuid.PcdPciHotPlugResourcePadBus
> +
> +[Depex]
> + TRUE
> diff --git a/Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.c
> b/Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.c
> new file mode 100644
> index 000000000000..b977406bbcae
> --- /dev/null
> +++ b/Platform/AMD/PlatformPkg/PciHotPlug/PciHotPlugInit.c
> @@ -0,0 +1,340 @@
> +/** @file
> + This file declares EFI PCI Hot Plug Init Protocol.
> +
> + This protocol provides the necessary functionality to initialize the Hot
> Plug
> + Controllers (HPCs) and the buses that they control. This protocol also
> provides
> + information regarding resource padding.
> +
> + @par Note:
> + This source has the reference of OVMF PciHotPluginit.c and Intel
> platform PciHotPlug.c.
> +
> + This protocol is required only on platforms that support one or more PCI
> Hot
> + Plug* slots or CardBus sockets.
> +
> + The EFI_PCI_HOT_PLUG_INIT_PROTOCOL provides a mechanism for the PCI bus
> enumerator
> + to properly initialize the HPCs and CardBus sockets that require
> initialization.
> + The HPC initialization takes place before the PCI enumeration process is
> complete.
> + There cannot be more than one instance of this protocol in a system. This
> protocol
> + is installed on its own separate handle.
> +
> + Because the system may include multiple HPCs, one instance of this protocol
> + should represent all of them. The protocol functions use the device path of
> + the HPC to identify the HPC. When the PCI bus enumerator finds a root HPC,
> it
> + will call EFI_PCI_HOT_PLUG_INIT_PROTOCOL.InitializeRootHpc(). If
> InitializeRootHpc()
> + is unable to initialize a root HPC, the PCI enumerator will ignore that
> root HPC
> + and continue the enumeration process. If the HPC is not initialized, the
> devices
> + that it controls may not be initialized, and no resource padding will be
> provided.
> +
> + From the standpoint of the PCI bus enumerator, HPCs are divided into the
> following
> + two classes:
> +
> + - Root HPC:
> + These HPCs must be initialized by calling InitializeRootHpc() during
> the
> + enumeration process. These HPCs will also require resource padding.
> The
> + platform code must have a priori knowledge of these devices and must
> know
> + how to initialize them. There may not be any way to access their PCI
> + configuration space before the PCI enumerator programs all the
> upstream
> + bridges and thus enables the path to these devices. The PCI bus
> enumerator
> + is responsible for determining the PCI bus address of the HPC before
> it
> + calls InitializeRootHpc().
> + - Nonroot HPC:
> + These HPCs will not need explicit initialization during enumeration
> process.
> + These HPCs will require resource padding. The platform code does not
> have
> + to have a priori knowledge of these devices.
> +
> + Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
> + Copyright (C) 2016, Red Hat, Inc.<BR>
> + Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> + @par Revision Reference:
> + This Protocol is defined in UEFI Platform Initialization Specification 1.2
I know you say above that this is based on existing code, but 1.2 is
ancient. Latest version is 1.7 - is there anything missing from being
compliant with that version?
> + Volume 5: Standards
> +
> +**/
> +
> +#include <Uefi/UefiBaseType.h>
> +#include <Uefi/UefiSpec.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/MemoryAllocationLib.h>
I (personally) also like to sort include files within each
Uefi/Library/Protocol group alphabetically.
/
Leif
> +#include <Protocol/PciHotPlugInit.h>
> +
> +//
> +// The protocol interface this driver produces.
> +//
> +STATIC EFI_PCI_HOT_PLUG_INIT_PROTOCOL mPciHotPlugInit;
> +
> +/**
> + Returns a list of root Hot Plug Controllers (HPCs) that require
> initialization
> + during the boot process.
> +
> + This procedure returns a list of root HPCs. The PCI bus driver must
> initialize
> + these controllers during the boot process. The PCI bus driver may or may
> not be
> + able to detect these HPCs. If the platform includes a PCI-to-CardBus
> bridge, it
> + can be included in this list if it requires initialization. The HpcList
> must be
> + self consistent. An HPC cannot control any of its parent buses. Only one
> HPC can
> + control a PCI bus. Because this list includes only root HPCs, no HPC in
> the list
> + can be a child of another HPC. This policy must be enforced by the
> + EFI_PCI_HOT_PLUG_INIT_PROTOCOL. The PCI bus driver may not check for such
> + invalid conditions. The callee allocates the buffer HpcList
> +
> + @param[in] This Pointer to the EFI_PCI_HOT_PLUG_INIT_PROTOCOL
> instance.
> + @param[out] HpcCount The number of root HPCs that were returned.
> + @param[out] HpcList The list of root HPCs. HpcCount defines the number
> of
> + elements in this list.
> +
> + @retval EFI_SUCCESS HpcList was returned.
> + @retval EFI_OUT_OF_RESOURCES HpcList was not returned due to
> insufficient
> + resources.
> + @retval EFI_INVALID_PARAMETER HpcCount is NULL or HpcList is NULL.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +GetRootHpcList (
> + IN EFI_PCI_HOT_PLUG_INIT_PROTOCOL *This,
> + OUT UINTN *HpcCount,
> + OUT EFI_HPC_LOCATION **HpcList
> + )
> +{
> + if ((HpcCount == NULL) || (HpcList == NULL)) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + //
> + // Platform BIOS not doing any extra/special HPC initialization
> + // Hence returning the HpcCount as zero and HpcList as NULL
> + //
> + *HpcCount = 0;
> + *HpcList = NULL;
> +
> + return EFI_SUCCESS;
> +}
> +
> +/**
> + Initializes one root Hot Plug Controller (HPC). This process may causes
> + initialization of its subordinate buses.
> +
> + This function initializes the specified HPC. At the end of initialization,
> + the hot-plug slots or sockets (controlled by this HPC) are powered and are
> + connected to the bus. All the necessary registers in the HPC are set up.
> For
> + a Standard (PCI) Hot Plug Controller (SHPC), the registers that must be set
> + up are defined in the PCI Standard Hot Plug Controller and Subsystem
> + Specification.
> +
> + @param[in] This Pointer to the EFI_PCI_HOT_PLUG_INIT_PROTOCOL
> instance.
> + @param[in] HpcDevicePath The device path to the HPC that is being
> initialized.
> + @param[in] HpcPciAddress The address of the HPC function on the PCI bus.
> + @param[in] Event The event that should be signaled when the HPC
> + initialization is complete. Set to NULL if the
> + caller wants to wait until the entire
> initialization
> + process is complete.
> + @param[out] HpcState The state of the HPC hardware. The state is
> + EFI_HPC_STATE_INITIALIZED or
> EFI_HPC_STATE_ENABLED.
> +
> + @retval EFI_SUCCESS If Event is NULL, the specific HPC was
> successfully
> + initialized. If Event is not NULL, Event
> will be
> + signaled at a later time when
> initialization is complete.
> + @retval EFI_UNSUPPORTED This instance of
> EFI_PCI_HOT_PLUG_INIT_PROTOCOL
> + does not support the specified HPC.
> + @retval EFI_OUT_OF_RESOURCES Initialization failed due to insufficient
> + resources.
> + @retval EFI_INVALID_PARAMETER HpcState is NULL.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +InitializeRootHpc (
> + IN EFI_PCI_HOT_PLUG_INIT_PROTOCOL *This,
> + IN EFI_DEVICE_PATH_PROTOCOL *HpcDevicePath,
> + IN UINT64 HpcPciAddress,
> + IN EFI_EVENT Event, OPTIONAL
> + OUT EFI_HPC_STATE *HpcState
> + )
> +{
> + if (HpcState == NULL) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + //
> + // This Platform doesnt have any non-enumerated HPC.
> + // Hence no extra initialization required from Platform BIOS.
> + //
> + return EFI_UNSUPPORTED;
> +}
> +
> +/**
> + Returns the resource padding that is required by the PCI bus that is
> controlled
> + by the specified Hot Plug Controller (HPC).
> +
> + This function returns the resource padding that is required by the PCI bus
> that
> + is controlled by the specified HPC. This member function is called for all
> the
> + root HPCs and nonroot HPCs that are detected by the PCI bus enumerator.
> This
> + function will be called before PCI resource allocation is completed. This
> function
> + must be called after all the root HPCs, with the possible exception of a
> + PCI-to-CardBus bridge, have completed initialization.
> +
> + @param[in] This Pointer to the EFI_PCI_HOT_PLUG_INIT_PROTOCOL
> instance.
> + @param[in] HpcDevicePath The device path to the HPC.
> + @param[in] HpcPciAddress The address of the HPC function on the PCI bus.
> + @param[out] HpcState The state of the HPC hardware.
> + @param[out] Padding The amount of resource padding that is
> required by the
> + PCI bus under the control of the specified HPC.
> + @param[out] Attributes Describes how padding is accounted for. The
> padding
> + is returned in the form of ACPI 2.0 resource
> descriptors.
> +
> + @retval EFI_SUCCESS The resource padding was successfully
> returned.
> + @retval EFI_UNSUPPORTED This instance of the
> EFI_PCI_HOT_PLUG_INIT_PROTOCOL
> + does not support the specified HPC.
> + @retval EFI_NOT_READY This function was called before HPC
> initialization
> + is complete.
> + @retval EFI_INVALID_PARAMETER HpcState or Padding or Attributes is NULL.
> + @retval EFI_OUT_OF_RESOURCES ACPI 2.0 resource descriptors for Padding
> + cannot be allocated due to insufficient
> resources.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +GetResourcePadding (
> + IN EFI_PCI_HOT_PLUG_INIT_PROTOCOL *This,
> + IN EFI_DEVICE_PATH_PROTOCOL *HpcDevicePath,
> + IN UINT64 HpcPciAddress,
> + OUT EFI_HPC_STATE *HpcState,
> + OUT VOID **Padding,
> + OUT EFI_HPC_PADDING_ATTRIBUTES *Attributes
> + )
> +{
> + EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *PaddingResource;
> +
> + //
> + // Need total 5 resources
> + // 1 - IO resource
> + // 2 - Mem resource
> + // 3 - PMem resource
> + // 4 - Bus resource
> + // 5 - end tag resource
> + PaddingResource = AllocateZeroPool (4 * sizeof
> (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) + sizeof (EFI_ACPI_END_TAG_DESCRIPTOR));
> + if (PaddingResource == NULL) {
> + return EFI_OUT_OF_RESOURCES;
> + }
> +
> + *Padding = (VOID *)PaddingResource;
> +
> + //
> + // Padding for bus
> + //
> + *Attributes = EfiPaddingPciBus;
> +
> + PaddingResource->Desc = ACPI_ADDRESS_SPACE_DESCRIPTOR;
> + PaddingResource->Len = (UINT16)(
> + sizeof
> (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) -
> + OFFSET_OF (
> + EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR,
> + ResType
> + )
> + );
> + PaddingResource->ResType = ACPI_ADDRESS_SPACE_TYPE_BUS;
> + PaddingResource->GenFlag = 0x0;
> + PaddingResource->SpecificFlag = 0;
> + PaddingResource->AddrRangeMin = 0;
> + PaddingResource->AddrRangeMax = 0;
> + PaddingResource->AddrLen = PcdGet8 (PcdPciHotPlugResourcePadBus);
> +
> + //
> + // Padding for non-prefetchable memory
> + //
> + PaddingResource++;
> + PaddingResource->Desc = ACPI_ADDRESS_SPACE_DESCRIPTOR;
> + PaddingResource->Len = (UINT16)(
> + sizeof
> (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) -
> + OFFSET_OF (
> + EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR,
> + ResType
> + )
> + );
> + PaddingResource->ResType = ACPI_ADDRESS_SPACE_TYPE_MEM;
> + PaddingResource->GenFlag = 0x0;
> + PaddingResource->AddrSpaceGranularity = 32;
> + PaddingResource->SpecificFlag =
> EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_NON_CACHEABLE;
> + PaddingResource->AddrRangeMin = 0;
> + PaddingResource->AddrLen = PcdGet64
> (PcdPciHotPlugResourcePadMem);
> + PaddingResource->AddrRangeMax = PaddingResource->AddrLen - 1;
> +
> + //
> + // Padding for prefetchable memory
> + //
> + PaddingResource++;
> + PaddingResource->Desc = ACPI_ADDRESS_SPACE_DESCRIPTOR;
> + PaddingResource->Len = (UINT16)(
> + sizeof
> (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) -
> + OFFSET_OF (
> + EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR,
> + ResType
> + )
> + );
> + PaddingResource->ResType = ACPI_ADDRESS_SPACE_TYPE_MEM;
> + PaddingResource->GenFlag = 0x0;
> + PaddingResource->AddrSpaceGranularity = 32;
> + PaddingResource->SpecificFlag =
> EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE;
> + PaddingResource->AddrLen = PcdGet64
> (PcdPciHotPlugResourcePadPMem);
> + PaddingResource->AddrRangeMax = PaddingResource->AddrLen - 1;
> +
> + //
> + // Padding for I/O
> + //
> + PaddingResource++;
> + PaddingResource->Desc = ACPI_ADDRESS_SPACE_DESCRIPTOR;
> + PaddingResource->Len = (UINT16)(
> + sizeof
> (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) -
> + OFFSET_OF (
> + EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR,
> + ResType
> + )
> + );
> + PaddingResource->ResType = ACPI_ADDRESS_SPACE_TYPE_IO;
> + PaddingResource->GenFlag = 0x0;
> + PaddingResource->SpecificFlag = 0;
> + PaddingResource->AddrRangeMin = 0;
> + PaddingResource->AddrLen = PcdGet64 (PcdPciHotPlugResourcePadIO);
> + PaddingResource->AddrRangeMax = PaddingResource->AddrLen - 1;
> +
> + //
> + // Terminate the entries.
> + //
> + PaddingResource++;
> + ((EFI_ACPI_END_TAG_DESCRIPTOR *)PaddingResource)->Desc =
> ACPI_END_TAG_DESCRIPTOR;
> + ((EFI_ACPI_END_TAG_DESCRIPTOR *)PaddingResource)->Checksum = 0x0;
> +
> + *HpcState = EFI_HPC_STATE_INITIALIZED | EFI_HPC_STATE_ENABLED;
> +
> + return EFI_SUCCESS;
> +}
> +
> +/**
> + Entry point for this driver.
> +
> + @param[in] ImageHandle Image handle of this driver.
> + @param[in] SystemTable Pointer to SystemTable.
> +
> + @retval EFI_SUCESS Driver has loaded successfully.
> + @return Error codes from lower level functions.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +PciHotPlugInitialize (
> + IN EFI_HANDLE ImageHandle,
> + IN EFI_SYSTEM_TABLE *SystemTable
> + )
> +{
> + mPciHotPlugInit.GetRootHpcList = GetRootHpcList;
> + mPciHotPlugInit.InitializeRootHpc = InitializeRootHpc;
> + mPciHotPlugInit.GetResourcePadding = GetResourcePadding;
> + return gBS->InstallMultipleProtocolInterfaces (
> + &ImageHandle,
> + &gEfiPciHotPlugInitProtocolGuid,
> + &mPciHotPlugInit,
> + NULL
> + );
> +}
> --
> 2.25.1
>
>
>
>
>
>
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