[PATCH edk2-platforms 3/5] Silicon/AMD/Styx: remove support for the ACPI parking protocol

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

The ACPI parking protocol is a kludge to allow SOC implementations
that lack EL3 support to bring up secondaries in a standardized
manner. Since our UEFI implementation unconditionally relies on
ARM Trusted Firmware and PSCI now, there is no point in supporting
the parking protocol any longer so let's remove it. (Note also that
the implementation of AmdStyxGetMpParkingBase is flawed, so it is
unsure whether it has ever worked in reality)

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 Silicon/AMD/Styx/AcpiTables/AcpiTables.inf         |  1 -
 Silicon/AMD/Styx/AcpiTables/Madt.c                 | 24 ++----------
 Silicon/AMD/Styx/AmdStyx.dec                       |  4 --
 Silicon/AMD/Styx/Common/Protocol/AmdMpBoot.h       | 39 --------------------
 Silicon/AMD/Styx/Common/Protocol/AmdMpCoreInfo.h   |  7 ----
 Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c | 21 -----------
 6 files changed, 3 insertions(+), 93 deletions(-)

diff --git a/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf b/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf
index bff5be4673a4..4ae64ac22665 100644
--- a/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf
+++ b/Silicon/AMD/Styx/AcpiTables/AcpiTables.inf
@@ -82,7 +82,6 @@ [FixedPcd]
   gAmdStyxTokenSpaceGuid.PcdSbsaWakeUpGSIV
   gAmdStyxTokenSpaceGuid.PcdSbsaWatchDogGSIV
   gAmdStyxTokenSpaceGuid.PcdSocCoresPerCluster
-  gAmdStyxTokenSpaceGuid.PcdParkingProtocolVersion
   gAmdStyxTokenSpaceGuid.PcdSata1PortCount
 
 [Depex]
diff --git a/Silicon/AMD/Styx/AcpiTables/Madt.c b/Silicon/AMD/Styx/AcpiTables/Madt.c
index 96182e790f98..43d415c8bc32 100644
--- a/Silicon/AMD/Styx/AcpiTables/Madt.c
+++ b/Silicon/AMD/Styx/AcpiTables/Madt.c
@@ -57,12 +57,7 @@ AMD_MP_CORE_INFO_PROTOCOL  *mAmdMpCoreInfoProtocol = NULL;
   #define MSI_TYPER_FLAG                     ( 0 ) // Use TYPER register and ignore Count/Base fields
 #endif
 
-#define PARKING_PROTOCOL_VERSION             (FixedPcdGet32 (PcdParkingProtocolVersion))
-#define PARKED_OFFSET                        ( 4096 )
-
 #define CORES_PER_CLUSTER                    (FixedPcdGet32 (PcdSocCoresPerCluster))
-#define PARKED_ADDRESS(Base, ClusterId, CoreId) \
-        ((Base) + (CORES_PER_CLUSTER * ClusterId + CoreId) * PARKED_OFFSET)
 
 
 /* Macro to populate EFI_ACPI_5_1_GIC_STRUCTURE */
@@ -73,7 +68,7 @@ AMD_MP_CORE_INFO_PROTOCOL  *mAmdMpCoreInfoProtocol = NULL;
   CpuNum,                               /* UINT32 CPUInterfaceNumber */       \
   (ClusterId << 8) | CoreId,            /* UINT32 AcpiProcessorUid */         \
   EFI_ACPI_5_1_GIC_ENABLED,             /* UINT32 Flags */                    \
-  PARKING_PROTOCOL_VERSION,             /* UINT32 ParkingProtocolVersion */   \
+  0,                                    /* UINT32 ParkingProtocolVersion */   \
   PerfInt,                              /* UINT32 PerformanceInterruptGsiv */ \
   0,                                    /* UINT64 ParkedAddress */            \
   GIC_BASE,                             /* UINT64 PhysicalBaseAddress */      \
@@ -194,8 +189,7 @@ BuildGicC (
   EFI_ACPI_5_1_GIC_STRUCTURE *GicC,
   UINT32 CpuNum,
   UINT32 ClusterId,
-  UINT32 CoreId,
-  EFI_PHYSICAL_ADDRESS MpParkingBase
+  UINT32 CoreId
   )
 {
   UINT32 MpId, PmuSpi;
@@ -212,8 +206,6 @@ BuildGicC (
   GicC->CPUInterfaceNumber = CpuNum;
   GicC->AcpiProcessorUid = MpId;
   GicC->Flags = EFI_ACPI_5_1_GIC_ENABLED;
-  GicC->ParkingProtocolVersion = PARKING_PROTOCOL_VERSION;
-  GicC->ParkedAddress = PARKED_ADDRESS(MpParkingBase, ClusterId, CoreId);
   GicC->PhysicalBaseAddress = GIC_BASE;
   GicC->GICV = GICV_BASE;
   GicC->GICH = GICH_BASE;
@@ -281,8 +273,6 @@ MadtHeader (
   ARM_CORE_INFO                          *ArmCoreInfoTable;
   UINTN                                  CoreCount, CpuNum;
   EFI_STATUS                             Status;
-  EFI_PHYSICAL_ADDRESS                   MpParkingBase;
-  UINTN                                  MpParkingSize;
 
   Status = gBS->LocateProtocol (
                &gAmdMpCoreInfoProtocolGuid,
@@ -299,13 +289,6 @@ MadtHeader (
   ASSERT (CoreCount <= NUM_CORES);
   ASSERT (CoreCount <= PcdGet32(PcdSocCoreCount));
 
-  MpParkingSize = 0;
-  MpParkingBase =  mAmdMpCoreInfoProtocol->GetMpParkingBase(&MpParkingSize);
-  if (MpParkingBase && MpParkingSize < (CoreCount * SIZE_4KB)) {
-    DEBUG ((EFI_D_ERROR, "MADT: Parking Protocol not supported.\n"));
-    MpParkingBase = 0;
-  }
-
   GicC = (EFI_ACPI_5_1_GIC_STRUCTURE *)&AcpiMadt.GicC[0];
   AcpiMadt.Header.Header.Length = sizeof (EFI_ACPI_5_1_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER);
 
@@ -315,8 +298,7 @@ MadtHeader (
 
     Status = BuildGicC (GicC, CpuNum,
                 ArmCoreInfoTable[CpuNum].ClusterId,
-                ArmCoreInfoTable[CpuNum].CoreId,
-                MpParkingBase
+                ArmCoreInfoTable[CpuNum].CoreId
                 );
     ASSERT_EFI_ERROR (Status);
 
diff --git a/Silicon/AMD/Styx/AmdStyx.dec b/Silicon/AMD/Styx/AmdStyx.dec
index cffe1cafde8b..1eb1ce801e0b 100644
--- a/Silicon/AMD/Styx/AmdStyx.dec
+++ b/Silicon/AMD/Styx/AmdStyx.dec
@@ -28,7 +28,6 @@ [Ppis]
   gAmdStyxPlatInitPpiGuid    = { 0xcbff429c, 0xd3e3, 0x4c50, { 0xac, 0x1a, 0x1c, 0xd2, 0xfe, 0x15, 0x1a, 0xd7 } }
 
 [Protocols]
-  gAmdMpBootProtocolGuid     = { 0xe21eac84, 0x9fbf, 0x4808, { 0x83, 0x93, 0xe1, 0x93, 0x97, 0x23, 0x48, 0xab } }
   gAmdMpCoreInfoProtocolGuid = { 0x0dba25f8, 0x2da1, 0x4ec5, { 0x89, 0x5d, 0x32, 0x1e, 0xd6, 0x1e, 0x3f, 0x43 } }
 
 [Guids]
@@ -101,9 +100,6 @@ [PcdsFixedAtBuild]
   # UEFI entry point
   gAmdStyxTokenSpaceGuid.PcdUefiEntryAddress|0x8000E80000|UINT64|0x000a0000
 
-  # Parking Protocol
-  gAmdStyxTokenSpaceGuid.PcdParkingProtocolVersion|1|UINT32|0x000b0000
-
   # The original offset in memory of the NV store firmware volume, before
   # relocating it to a dynamically allocated buffer. We need this to correlate
   # flash accesses to the in-memory copy with LBAs in the actual SPI flash
diff --git a/Silicon/AMD/Styx/Common/Protocol/AmdMpBoot.h b/Silicon/AMD/Styx/Common/Protocol/AmdMpBoot.h
deleted file mode 100644
index 2aa4c55ccbaf..000000000000
--- a/Silicon/AMD/Styx/Common/Protocol/AmdMpBoot.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/** @file
-
-  Copyright (c) 2016, AMD Inc. All rights reserved.<BR>
-
-  This program and the accompanying materials
-  are licensed and made available under the terms and conditions of the BSD License
-  which accompanies this distribution.  The full text of the license may be found at
-  http://opensource.org/licenses/bsd-license.php
-
-  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
-**/
-
-#ifndef _AMD_MP_BOOT_H_
-#define _AMD_MP_BOOT_H_
-
-extern EFI_GUID gAmdMpBootProtocolGuid;
-
-typedef
-VOID
-(EFIAPI *PARK_SECONDARY_CORE) (
-  IN ARM_CORE_INFO        *ArmCoreInfo,
-  IN EFI_PHYSICAL_ADDRESS SecondaryEntry
-  );
-
-typedef struct _AMD_MP_BOOT_INFO {
-  EFI_PHYSICAL_ADDRESS  MpParkingBase;
-  UINTN                 MpParkingSize;
-  ARM_CORE_INFO         *ArmCoreInfoTable;
-  UINTN                 ArmCoreCount;
-} AMD_MP_BOOT_INFO;
-
-typedef struct _AMD_MP_BOOT_PROTOCOL {
-  PARK_SECONDARY_CORE  ParkSecondaryCore;
-  AMD_MP_BOOT_INFO     *MpBootInfo;
-} AMD_MP_BOOT_PROTOCOL;
-
-#endif // _AMD_MP_BOOT_H_
diff --git a/Silicon/AMD/Styx/Common/Protocol/AmdMpCoreInfo.h b/Silicon/AMD/Styx/Common/Protocol/AmdMpCoreInfo.h
index 95f46e8af962..e6aa8fb1bec9 100644
--- a/Silicon/AMD/Styx/Common/Protocol/AmdMpCoreInfo.h
+++ b/Silicon/AMD/Styx/Common/Protocol/AmdMpCoreInfo.h
@@ -30,16 +30,9 @@ EFI_STATUS
   OUT UINT32  *PmuSpi
   );
 
-typedef
-EFI_PHYSICAL_ADDRESS
-(EFIAPI *GET_MP_PARKING_BASE) (
-  OUT UINTN  *MpParkingSize
-  );
-
 typedef struct _AMD_MP_CORE_INFO_PROTOCOL {
   GET_ARM_CORE_INFO_TABLE  GetArmCoreInfoTable;
   GET_PMU_SPI_FROM_MPID    GetPmuSpiFromMpId;
-  GET_MP_PARKING_BASE      GetMpParkingBase;
 } AMD_MP_CORE_INFO_PROTOCOL;
 
 #endif // _AMD_MP_CORE_INFO_H_
diff --git a/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c b/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c
index e713d5581925..68f97fb89148 100644
--- a/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c
+++ b/Silicon/AMD/Styx/Drivers/PlatInitDxe/PlatInitDxe.c
@@ -29,11 +29,9 @@
 #include <Guid/ArmMpCoreInfo.h>
 
 #include <Protocol/AmdMpCoreInfo.h>
-#include <Protocol/AmdMpBoot.h>
 
 
 STATIC AMD_MP_CORE_INFO_PROTOCOL  mAmdMpCoreInfoProtocol = { 0 };
-STATIC AMD_MP_BOOT_INFO           mAmdMpBootInfo = { 0 };
 
 
 STATIC
@@ -49,12 +47,6 @@ AmdStyxGetPmuSpiFromMpId (
   OUT UINT32  *PmuSpi
   );
 
-STATIC
-EFI_PHYSICAL_ADDRESS
-AmdStyxGetMpParkingBase (
-  OUT UINTN  *MpParkingSize
-  );
-
 
 #pragma pack(push, 1)
 typedef struct _PMU_INFO {
@@ -101,7 +93,6 @@ PlatInitDxeEntryPoint (
   // Install CoreInfo Protocol
   mAmdMpCoreInfoProtocol.GetArmCoreInfoTable = AmdStyxGetArmCoreInfoTable;
   mAmdMpCoreInfoProtocol.GetPmuSpiFromMpId = AmdStyxGetPmuSpiFromMpId;
-  mAmdMpCoreInfoProtocol.GetMpParkingBase = AmdStyxGetMpParkingBase;
   Status = gBS->InstallProtocolInterface (
                   &Handle,
                   &gAmdMpCoreInfoProtocolGuid,
@@ -153,15 +144,3 @@ AmdStyxGetPmuSpiFromMpId (
   return EFI_INVALID_PARAMETER;
 }
 
-
-STATIC
-EFI_PHYSICAL_ADDRESS
-AmdStyxGetMpParkingBase (
-  OUT UINTN  *MpParkingSize
-  )
-{
-  ASSERT (MpParkingSize != NULL);
-
-  *MpParkingSize = mAmdMpBootInfo.MpParkingBase;
-  return mAmdMpBootInfo.MpParkingBase;
-}
-- 
2.17.0