Hi Nishant,
Please find my response inline marked [SAMI].
Regards,
Sami Mujawar
[SAMI] Can you explain the use-case/reason, please?Isolated CPUs are those that are not to be used on the platform for various reasons. The isolated CPU list is an array of MPID values of
[SAMI] Why is IORT table being removed here?the CPUs that have to be isolated. This list is supplied via the NT_FW_CONFIG dtb. Add support to search for isolated CPUs MPID list and, if present, update the MADT table to disable the corresponding CPUs. Signed-off-by: Nishant Sharma <nishant.sharma@arm.com> --- Platform/ARM/SgiPkg/AcpiTables/RdN2Cfg1AcpiTables.inf | 1 - Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPei.inf | 8 +- Platform/ARM/SgiPkg/Include/SgiPlatform.h | 7 ++ Platform/ARM/SgiPkg/Drivers/PlatformDxe/PlatformDxe.c | 131 +++++++++++++++++++- Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPeim.c | 45 ++++++- 5 files changed, 186 insertions(+), 6 deletions(-) diff --git a/Platform/ARM/SgiPkg/AcpiTables/RdN2Cfg1AcpiTables.inf b/Platform/ARM/SgiPkg/AcpiTables/RdN2Cfg1AcpiTables.inf index 4b36c3e5ceb2..e13c2f08ce6e 100644 --- a/Platform/ARM/SgiPkg/AcpiTables/RdN2Cfg1AcpiTables.inf +++ b/Platform/ARM/SgiPkg/AcpiTables/RdN2Cfg1AcpiTables.inf @@ -18,7 +18,6 @@ Dbg2.aslc Fadt.aslc Gtdt.aslc - Iort.aslc
Mcfg.aslc
RdN2Cfg1/Dsdt.asl
RdN2Cfg1/Madt.aslc
diff --git a/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPei.inf b/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPei.inf
index 407160c07563..fbf061ad3bdb 100644
--- a/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPei.inf
+++ b/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPei.inf
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2018, ARM Limited. All rights reserved.
+# Copyright (c) 2018-2022, ARM Limited. All rights reserved.
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -13,6 +13,7 @@
ENTRY_POINT = SgiPlatformPeim
[Packages]
+ ArmPlatformPkg/ArmPlatformPkg.dec
EmbeddedPkg/EmbeddedPkg.dec
MdePkg/MdePkg.dec
Platform/ARM/SgiPkg/SgiPlatform.dec
@@ -21,6 +22,11 @@
FdtLib
PeimEntryPoint
+[FixedPcd]
+ gArmSgiTokenSpaceGuid.PcdChipCount
+ gArmPlatformTokenSpaceGuid.PcdCoreCount
+ gArmPlatformTokenSpaceGuid.PcdClusterCount
+
[Sources]
SgiPlatformPeim.c
diff --git a/Platform/ARM/SgiPkg/Include/SgiPlatform.h b/Platform/ARM/SgiPkg/Include/SgiPlatform.h
index dddb58832d73..311286ce5337 100644
--- a/Platform/ARM/SgiPkg/Include/SgiPlatform.h
+++ b/Platform/ARM/SgiPkg/Include/SgiPlatform.h
@@ -65,11 +65,18 @@
#define DRAM_BLOCK2_BASE_REMOTE(ChipId) \
(SGI_REMOTE_CHIP_MEM_OFFSET (ChipId) + FixedPcdGet64 (PcdDramBlock2Base))
+// List of isolated CPUs MPID
+typedef struct {
+ UINT64 Count; // Number of elements present in the list
+ UINT64 Mpid[]; // List containing isolated CPU MPIDs
+} SGI_ISOLATED_CPU_LIST;
+
// ARM platform description data.
typedef struct {
UINTN PlatformId;
UINTN ConfigId;
UINTN MultiChipMode;
+ SGI_ISOLATED_CPU_LIST IsolatedCpuList;
} SGI_PLATFORM_DESCRIPTOR;
// Arm SGI/RD Product IDs
diff --git a/Platform/ARM/SgiPkg/Drivers/PlatformDxe/PlatformDxe.c b/Platform/ARM/SgiPkg/Drivers/PlatformDxe/PlatformDxe.c
index 2f72e7152ff3..80190120ff32 100644
--- a/Platform/ARM/SgiPkg/Drivers/PlatformDxe/PlatformDxe.c
+++ b/Platform/ARM/SgiPkg/Drivers/PlatformDxe/PlatformDxe.c
@@ -1,14 +1,17 @@
/** @file
*
-* Copyright (c) 2018, ARM Limited. All rights reserved.
+* Copyright (c) 2018 - 2022, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
+#include <IndustryStandard/Acpi.h>
+
#include <Library/AcpiLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
+#include <Library/UefiBootServicesTableLib.h>
#include <SgiPlatform.h>
VOID
@@ -16,6 +19,127 @@ InitVirtioDevices (
VOID
);
+/**
+ Search for a MPID in a list
+
+ Performs a linear search for a specified MPID on the given linear
+ list of MPIDs.
+
+ @param[in] MpidList Pointer to list.
+ @param[in] Count Number of the elements in the list.
+ @param[in] Mpid Target MPID.
+
+ @retval TRUE MPID is present.
+ @retval FALSE MPID is not present.
+**/
+STATIC
+BOOLEAN
+CheckIfMpidIsPresent (
+ IN UINT64 *MpidList,
+ IN UINT64 Count,
+ IN UINT64 Mpid
+ )
+{
+ UINT64 Idx;
+
+ for (Idx = 0; Idx < Count; Idx++) {
+ if (MpidList[Idx] == Mpid) {
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+/**
+ Disables isolated CPUs in the MADT table
+
+ Parse the IsolatedCpuInfo from the Hob list and updates the MADT table to
[SAMI] Nit. updates -> update
+ disable cpu's which are not available on the platfrom.
+
+ @param[in] AcpiHeader Points to the Madt table.
+ @param[in] HobData Points to the unusable cpuinfo in hoblist.
+**/
+STATIC
+VOID
+UpdateMadtTable (
+ IN EFI_ACPI_DESCRIPTION_HEADER *AcpiHeader,
+ IN SGI_PLATFORM_DESCRIPTOR *HobData
+ )
+{
+ UINT8 *StructureListHead;
+ UINT8 *StructureListTail;
+ EFI_ACPI_6_4_GIC_STRUCTURE *GicStructure;
+ BOOLEAN MpidPresent;
+
+ if (HobData->IsolatedCpuList.Count == 0) {
+ return;
+ }
+
+ StructureListHead =
+ ((UINT8 *)AcpiHeader) +
+ sizeof(EFI_ACPI_6_4_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER);
+ StructureListTail = (UINT8 *)AcpiHeader + AcpiHeader->Length;
+
+ // Locate ACPI GICC structure in the MADT table.
+ while (StructureListHead < StructureListTail) {
+ if (StructureListHead[0] == EFI_ACPI_6_4_GIC) {
[SAMI] This is definitely not the way to parse an ACPI table. Please dont do this.
Also, why are you not using DynamicTables framework? It is designed to handle such cases.
[/SAMI]
+ GicStructure = (EFI_ACPI_6_4_GIC_STRUCTURE *)StructureListHead;
+ // Disable the CPU if its MPID is present in the list.
+ MpidPresent = CheckIfMpidIsPresent(
+ HobData->IsolatedCpuList.Mpid,
+ HobData->IsolatedCpuList.Count,
+ GicStructure->MPIDR
+ );
+ if (MpidPresent == TRUE) {
+ DEBUG ((
+ DEBUG_INFO,
+ "Disabling Core: %lu, MPID: 0x%llx in MADT\n",
+ GicStructure->AcpiProcessorUid,
+ GicStructure->MPIDR
+ ));
+ GicStructure->Flags = 0;
+ }
+ }
+
+ // Second element in the structure component header is length
+ StructureListHead += StructureListHead[1];
+ }
+}
+
+/**
+ Callback to validate and/or update ACPI table.
+
+ On finding a MADT table, disable the isolated CPUs in the MADT table. The
+ list of isolated CPUs are obtained from the HOB data.
+
+ @param[in] AcpiHeader Target ACPI table.
+
+ @retval TURE Table validated/updated successfully.
+ @retval FALSE Error in Table validation/updation.
+**/
+STATIC
+BOOLEAN
+CheckAndUpdateAcpiTable (
+ IN EFI_ACPI_DESCRIPTION_HEADER *AcpiHeader
+ )
+{
+ VOID *SystemIdHob;
+ SGI_PLATFORM_DESCRIPTOR *HobData;
+
+ // This check updates the MADT table to disable isolated CPUs present on the
+ // platform.
+ if (AcpiHeader->Signature == EFI_ACPI_1_0_APIC_SIGNATURE) {
[SAMI] Why EFI_ACPI_6_4_MULTIPLE_APIC_DESCRIPTION_TABLE_SIGNATURE is not used here?
+ SystemIdHob = GetFirstGuidHob (&gArmSgiPlatformIdDescriptorGuid);
+ if (SystemIdHob != NULL) {
+ HobData = (SGI_PLATFORM_DESCRIPTOR *)GET_GUID_HOB_DATA (SystemIdHob);
+ UpdateMadtTable (AcpiHeader, HobData);
+ }
+ }
+
+ return TRUE;
+}
+
EFI_STATUS
EFIAPI
ArmSgiPkgEntryPoint (
@@ -25,7 +149,10 @@ ArmSgiPkgEntryPoint (
{
EFI_STATUS Status;
- Status = LocateAndInstallAcpiFromFv (&gArmSgiAcpiTablesGuid);
+ Status = LocateAndInstallAcpiFromFvConditional (
+ &gArmSgiAcpiTablesGuid,
+ &CheckAndUpdateAcpiTable
+ );
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a: Failed to install ACPI tables\n", __FUNCTION__));
return Status;
diff --git a/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPeim.c b/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPeim.c
index 7df52cc4fd7c..f778dc8ac7c1 100644
--- a/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPeim.c
+++ b/Platform/ARM/SgiPkg/Library/SgiPlatformPei/SgiPlatformPeim.c
@@ -1,6 +1,6 @@
/** @file
*
-* Copyright (c) 2018, ARM Limited. All rights reserved.
+* Copyright (c) 2018-2022, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
@@ -38,6 +38,8 @@ GetSgiSystemId (
CONST VOID *NtFwCfgDtBlob;
SGI_NT_FW_CONFIG_INFO_PPI *NtFwConfigInfoPpi;
EFI_STATUS Status;
+ UINT64 IsolatedCpuCount;
+ UINT64 CoreCount;
Status = PeiServicesLocatePpi (&gNtFwConfigDtInfoPpiGuid, 0, NULL,
(VOID**)&NtFwConfigInfoPpi);
@@ -83,6 +85,32 @@ GetSgiSystemId (
HobData->MultiChipMode = fdt32_to_cpu (*Property);
}
+ Property = fdt_getprop (NtFwCfgDtBlob, Offset, "isolated-cpu-list", NULL);
+ if (Property == NULL) {
+ DEBUG ((DEBUG_INFO, "%s property not found\n", "isolated-cpu-list"));
+ HobData->IsolatedCpuList.Count = 0;
+ } else {
+ CopyMem (&IsolatedCpuCount, Property, sizeof (IsolatedCpuCount));
+ CoreCount =
+ FixedPcdGet32 (PcdChipCount) *
+ FixedPcdGet32 (PcdClusterCount) *
+ FixedPcdGet32 (PcdCoreCount);
+ if (IsolatedCpuCount > CoreCount) {
+ DEBUG ((
+ DEBUG_ERROR,
+ "IsolatedCpuCount(%u) is higher than CoreCount(%u)\n",
+ IsolatedCpuCount,
+ CoreCount
+ ));
+ return EFI_SUCCESS;
[SAMI] Is the status code returned here correct? Should this be EFI_INVALID_PARAMETER? Also the function name GetSgiSystemId() seems to no longer reflect what the function does. Hace you considered renaming it.[SAMI] Coding convention is not followed here and at other places. Can you fix, please?+ } + CopyMem ( + &HobData->IsolatedCpuList, + Property, + sizeof(HobData->IsolatedCpuList) + (CoreCount * sizeof(UINT64))
+ );
+ }
+
return EFI_SUCCESS;
}
@@ -104,11 +132,24 @@ SgiPlatformPeim (
{
SGI_PLATFORM_DESCRIPTOR *HobData;
EFI_STATUS Status;
+ UINT64 CoreCount;
+ UINTN HobSize;
+ CoreCount =
+ FixedPcdGet32 (PcdChipCount) *
+ FixedPcdGet32 (PcdClusterCount) *
+ FixedPcdGet32 (PcdCoreCount);
+
+ // Additional size for SGI_ISOLATED_CPU_LIST.
+ // Size = (MPID register size in bytes * CoreCount) +
+ // sizeof(SGI_PLATFORM_DESCRIPTOR)
+ HobSize =
+ sizeof (SGI_PLATFORM_DESCRIPTOR) +
+ (CoreCount * sizeof(UINT64));
// Create platform descriptor HOB
HobData = (SGI_PLATFORM_DESCRIPTOR *)BuildGuidHob (
&gArmSgiPlatformIdDescriptorGuid,
- sizeof (SGI_PLATFORM_DESCRIPTOR));
+ HobSize);
// Get the system id from the platform specific nt_fw_config device tree
if (HobData == NULL) {
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