[AMD Official Use Only - General]
Hi Abdul,
Is this change just a initial patch that clone PciHotPlugInit.c to under
AmdMIniBordPkg? Do we have AMD modification on this file? Because I don't see
AMD license in the file header.
Just curious about why do we change the GUID of DSC file?
Thanks
Abner
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Abdul
> Lateef Attar via groups.io
> Sent: Monday, May 22, 2023 11:54 AM
> To: devel@edk2.groups.io
> Cc: Attar, AbdulLateef (Abdul Lateef) <abdullateef.at...@amd.com>; Chang,
> Abner <abner.ch...@amd.com>
> Subject: [edk2-devel] [PATCH 1/1] AMD/AmdMinBoardPkg: Implements PCI
> hotplug init protocol
>
> Caution: This message originated from an External Source. Use proper caution
> when opening attachments, clicking links, or responding.
>
>
> From: Abdul Lateef Attar <abdullateef.at...@amd.com>
>
> Implements PCI hotplug init protocol.
> Adds resources padding based on PCD values.
>
> Cc: Abner Chang <abner.ch...@amd.com>
>
> Signed-off-by: Abdul Lateef Attar <abdullateef.at...@amd.com>
> ---
> .../AMD/AmdMinBoardPkg/AmdMinBoardPkg.dec | 16 +
> .../AMD/AmdMinBoardPkg/AmdMinBoardPkg.dsc | 14 +-
> .../PciHotPlug/PciHotPlugInit.inf | 39 +++
> .../PciHotPlug/PciHotPlugInit.c | 331 ++++++++++++++++++
> 4 files changed, 399 insertions(+), 1 deletion(-)
> create mode 100755
> Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.inf
> create mode 100755
> Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.c
>
> diff --git a/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dec
> b/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dec
> index e37b02c4cf5a..65ba08545021 100644
> --- a/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dec
> +++ b/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dec
> @@ -17,3 +17,19 @@ [Defines]
> PACKAGE_GUID = 44F9D761-9ECB-43DD-A5AC-177E5048701B
> PACKAGE_VERSION = 0.1
>
> +[Guids]
> + gAmdMinBoardPkgTokenSpaceGuid = {0xd4d23d79, 0x73bf, 0x460a,
> {0xa1, 0xc7, 0x85, 0xa3, 0xca, 0x71, 0xb9, 0x4c}}
> +
> +[PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
> + #
> + # PCI HotPlug Resource Padding
> + #
> + # PCI bus padding, number of bus to reserve, default 2 bus
> +
> gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadBus|2|UINT8
> |0x10000003
> + # IO Resource padding in bytes, default 4KB
> +
> gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadIo|0x000010
> 00|UINT32|0x10000000
> + # Non-PreFetch Memory padding in bytes, default 1MB
> +
> gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadMem|0x0010
> 0000|UINT32|0x10000002
> + # PreFetch Memory padding in bytes, default 2MB
> +
> gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadPMem|0x002
> 00000|UINT32|0x10000001
> +
> diff --git a/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dsc
> b/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dsc
> index 273cd74f7842..1a8407250c56 100644
> --- a/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dsc
> +++ b/Platform/AMD/AmdMinBoardPkg/AmdMinBoardPkg.dsc
> @@ -9,7 +9,7 @@
>
> [Defines]
> DSC_SPECIFICATION = 1.30
> - PLATFORM_GUID = 88F8A9AE-2FA0-4D58-A6F9-05F635C05F4E
> + PLATFORM_GUID = 939B559B-269B-4B8F-9637-44DF6575C1E2
> PLATFORM_NAME = AmdMinBoardPkg
> PLATFORM_VERSION = 0.1
> OUTPUT_DIRECTORY = Build/$(PLATFORM_NAME)
> @@ -25,6 +25,16 @@ [Packages]
> [LibraryClasses]
> SpcrDeviceLib|AmdMinBoardPkg/Library/SpcrDeviceLib/SpcrDeviceLib.inf
>
> +[LibraryClasses.common]
> + BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
> +
> BaseMemoryLib|MdePkg/Library/BaseMemoryLibRepStr/BaseMemoryLibRe
> pStr.inf
> + DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
> +
> MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemor
> yAllocationLib.inf
> + PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
> +
> RegisterFilterLib|MdePkg/Library/RegisterFilterLibNull/RegisterFilterLibNull.inf
> +
> UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBoo
> tServicesTableLib.inf
> +
> UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryP
> oint.inf
> +
> [LibraryClasses.common.PEIM]
>
> SetCacheMtrrLib|AmdMinBoardPkg/Library/SetCacheMtrrLib/SetCacheMtrrLi
> b.inf
>
> @@ -34,3 +44,5 @@ [Components]
> [Components.IA32]
> AmdMinBoardPkg/Library/SetCacheMtrrLib/SetCacheMtrrLib.inf
>
> +[Components.X64]
> + AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.inf
> diff --git a/Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.inf
> b/Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.inf
> new file mode 100755
> index 000000000000..44564df38718
> --- /dev/null
> +++ b/Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.inf
> @@ -0,0 +1,39 @@
> +## @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 = 85F78A6D-6438-4BCC-B796-759A48D00C72
> + MODULE_TYPE = DXE_DRIVER
> + VERSION_STRING = 0.1
> + ENTRY_POINT = PciHotPlugInitialize
> +
> +[Sources]
> + PciHotPlugInit.c
> +
> +[Packages]
> + AmdMinBoardPkg/AmdMinBoardPkg.dec
> + MdeModulePkg/MdeModulePkg.dec
> + MdePkg/MdePkg.dec
> +
> +[LibraryClasses]
> + MemoryAllocationLib
> + UefiBootServicesTableLib
> + UefiDriverEntryPoint
> +
> +[Protocols]
> + gEfiPciHotPlugInitProtocolGuid
> +
> +[Pcd]
> + gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadBus
> + gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadIo
> + gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadMem
> + gAmdMinBoardPkgTokenSpaceGuid.PcdPciHotPlugResourcePadPMem
> +
> +[Depex]
> + TRUE
> diff --git a/Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.c
> b/Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.c
> new file mode 100755
> index 000000000000..a26ca16741b8
> --- /dev/null
> +++ b/Platform/AMD/AmdMinBoardPkg/PciHotPlug/PciHotPlugInit.c
> @@ -0,0 +1,331 @@
> +/** @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>
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> + @par Revision Reference:
> + This Protocol is defined in UEFI Platform Initialization Specification 1.2
> + Volume 5: Standards
> +
> +**/
> +
> +#include <Uefi/UefiBaseType.h>
> +#include <Uefi/UefiSpec.h>
> +#include <Library/UefiBootServicesTableLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +#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_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_UNSUPPORTED This instance of
> EFI_PCI_HOT_PLUG_INIT_PROTOCOL
> + does not support the specified HPC.
> + @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;
> + }
> +
> + //
> + // HPC is initialized by respective platform PI modules.
> + // Hence no extra initialization required.
> + //
> + 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[in] 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_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;
> +
> + if ((HpcState == NULL) || (Padding == NULL) || (Attributes == NULL)) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + //
> + // 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 = (UINT64)PcdGet32
> (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 = (UINT64)PcdGet32
> (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 = (UINT64)PcdGet32
> (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_SUCCESS 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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