Re: [edk2-devel] [Patch V3 5/5] UefiCpuPkg/PiSmmCpuDxe: use MpService2Ppi to wakeup AP in s3

["Ni, Ray" <ray.ni@intel.com>]

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Reviewed-by: Ray Ni <ray.ni@intel.com>



Thanks,
Ray
________________________________
From: Tan, Dun <dun.tan@intel.com>
Sent: Wednesday, August 30, 2023 3:34 PM
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Dong, Eric <eric.dong@intel.com>; Ni, Ray <ray.ni@intel.com>; Kumar, Rahul R <rahul.r.kumar@intel.com>
Subject: [Patch V3 5/5] UefiCpuPkg/PiSmmCpuDxe: use MpService2Ppi to wakeup AP in s3

Use MpService2Ppi to wakeup AP in s3 boot flow during initializing
CPU. If mSmmS3ResumeState->MpService2Ppi is not 0, then BSP will
use MpService2Ppi->StartupAllCPUs to do CPU initialization for both
BSP and AP instead of only sending InitSipiSipi for AP.

Signed-off-by: Dun Tan <dun.tan@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
---
 UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c | 58 +++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 35 insertions(+), 23 deletions(-)

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
index b9dbeaef87..0bae0e33f1 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
@@ -7,6 +7,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 **/

 #include "PiSmmCpuDxeSmm.h"
+#include <PiPei.h>
+#include <Ppi/MpServices2.h>

 #pragma pack(1)
 typedef struct {
@@ -594,18 +596,21 @@ InitializeCpuAfterRebase (
   UINT8  Stack[128];

   SetRegister (FALSE);
-  if (IsBsp) {
-    while (mNumberToFinish > 0) {
-      CpuPause ();
+
+  if (mSmmS3ResumeState->MpService2Ppi == 0) {
+    if (IsBsp) {
+      while (mNumberToFinish > 0) {
+        CpuPause ();
+      }
+    } else {
+      //
+      // Place AP into the safe code, count down the number with lock mechanism in the safe code.
+      //
+      TopOfStack  = (UINTN)Stack + sizeof (Stack);
+      TopOfStack &= ~(UINTN)(CPU_STACK_ALIGNMENT - 1);
+      CopyMem ((VOID *)(UINTN)mApHltLoopCode, mApHltLoopCodeTemplate, sizeof (mApHltLoopCodeTemplate));
+      TransferApToSafeState ((UINTN)mApHltLoopCode, TopOfStack, (UINTN)&mNumberToFinish);
     }
-  } else {
-    //
-    // Place AP into the safe code, count down the number with lock mechanism in the safe code.
-    //
-    TopOfStack  = (UINTN)Stack + sizeof (Stack);
-    TopOfStack &= ~(UINTN)(CPU_STACK_ALIGNMENT - 1);
-    CopyMem ((VOID *)(UINTN)mApHltLoopCode, mApHltLoopCodeTemplate, sizeof (mApHltLoopCodeTemplate));
-    TransferApToSafeState ((UINTN)mApHltLoopCode, TopOfStack, (UINTN)&mNumberToFinish);
   }
 }

@@ -783,11 +788,12 @@ SmmRestoreCpu (
   VOID
   )
 {
-  SMM_S3_RESUME_STATE       *SmmS3ResumeState;
-  IA32_DESCRIPTOR           Ia32Idtr;
-  IA32_DESCRIPTOR           X64Idtr;
-  IA32_IDT_GATE_DESCRIPTOR  IdtEntryTable[EXCEPTION_VECTOR_NUMBER];
-  EFI_STATUS                Status;
+  SMM_S3_RESUME_STATE         *SmmS3ResumeState;
+  IA32_DESCRIPTOR             Ia32Idtr;
+  IA32_DESCRIPTOR             X64Idtr;
+  IA32_IDT_GATE_DESCRIPTOR    IdtEntryTable[EXCEPTION_VECTOR_NUMBER];
+  EFI_STATUS                  Status;
+  EDKII_PEI_MP_SERVICES2_PPI  *Mp2ServicePpi;

   DEBUG ((DEBUG_INFO, "SmmRestoreCpu()\n"));

@@ -852,15 +858,21 @@ SmmRestoreCpu (
     //
     mInitApsAfterSmmBaseReloc = FALSE;

-    PrepareApStartupVector (mAcpiCpuData.StartupVector);
-    //
-    // Send INIT IPI - SIPI to all APs
-    //
-    SendInitSipiSipiAllExcludingSelf ((UINT32)mAcpiCpuData.StartupVector);
+    if (mSmmS3ResumeState->MpService2Ppi != 0) {
+      Mp2ServicePpi = (EDKII_PEI_MP_SERVICES2_PPI *)(UINTN)mSmmS3ResumeState->MpService2Ppi;
+      Mp2ServicePpi->StartupAllCPUs (Mp2ServicePpi, InitializeCpuProcedure, 0, NULL);
+    } else {
+      PrepareApStartupVector (mAcpiCpuData.StartupVector);
+      //
+      // Send INIT IPI - SIPI to all APs
+      //
+      SendInitSipiSipiAllExcludingSelf ((UINT32)mAcpiCpuData.StartupVector);
+      InitializeCpuProcedure (NULL);
+    }
+  } else {
+    InitializeCpuProcedure (NULL);
   }

-  InitializeCpuProcedure (NULL);
-
   //
   // Set a flag to restore SMM configuration in S3 path.
   //
--
2.31.1.windows.1



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