Reviewed-by: Ruiyu Ni <ruiyu...@intel.com>
-----Original Message-----
From: Dong, Eric
Sent: Friday, September 29, 2017 8:27 AM
To: edk2-devel@lists.01.org
Cc: Yao, Jiewen <jiewen....@intel.com>; Ni, Ruiyu <ruiyu...@intel.com>
Subject: [Patch v2 1/2] UefiCpuPkg/PiSmmCpuDxeSmm: Combine INIT-SIPI-SIPI.
In S3 resume path, current implementation do 2 separate INIT-SIPI-SIPI, this is
not necessary. This change combine these 2 INIT-SIPI-SIPI to 1 and add CpuPause
between them.
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Ruiyu Ni <ruiyu...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Eric Dong <eric.d...@intel.com>
---
UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c | 51 ++++++++++++++++++++-------------------
1 file changed, 26 insertions(+), 25 deletions(-)
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
index 9404501..ae4b516 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuS3.c
@@ -39,6 +39,11 @@ typedef struct {
//
SPIN_LOCK *mMemoryMappedLock = NULL;
+//
+// Signal that SMM BASE relocation is complete.
+//
+volatile BOOLEAN mInitApsAfterSmmBaseReloc;
+
/**
Get starting address and size of the rendezvous entry for APs.
Information for fixing a jump instruction in the code is also returned.
@@ -342,17 +347,21 @@ SetProcessorRegister (
}
}
+
+
/**
- AP initialization before SMBASE relocation in the S3 boot path.
+ AP initialization before then after SMBASE relocation in the S3 boot path.
**/
VOID
-EarlyMPRendezvousProcedure (
+MPRendezvousProcedure (
VOID
)
{
CPU_REGISTER_TABLE *RegisterTableList;
UINT32 InitApicId;
UINTN Index;
+ UINTN TopOfStack;
+ UINT8 Stack[128];
LoadMtrrData (mAcpiCpuData.MtrrTable);
@@ -368,25 +377,18 @@ EarlyMPRendezvousProcedure (
}
}
+
//
// Count down the number with lock mechanism.
//
InterlockedDecrement (&mNumberToFinish); -}
-/**
- AP initialization after SMBASE relocation in the S3 boot path.
-**/
-VOID
-MPRendezvousProcedure (
- VOID
- )
-{
- CPU_REGISTER_TABLE *RegisterTableList;
- UINT32 InitApicId;
- UINTN Index;
- UINTN TopOfStack;
- UINT8 Stack[128];
+ //
+ // Wait for BSP to signal SMM Base relocation done.
+ //
+ while (!mInitApsAfterSmmBaseReloc) {
+ CpuPause ();
+ }
ProgramVirtualWireMode ();
DisableLvtInterrupts ();
@@ -500,7 +502,12 @@ EarlyInitializeCpu (
PrepareApStartupVector (mAcpiCpuData.StartupVector);
mNumberToFinish = mAcpiCpuData.NumberOfCpus - 1;
- mExchangeInfo->ApFunction = (VOID *) (UINTN) EarlyMPRendezvousProcedure;
+ mExchangeInfo->ApFunction = (VOID *) (UINTN) MPRendezvousProcedure;
+
+ //
+ // Execute code for before SmmBaseReloc. Note: This flag is maintained
across S3 boots.
+ //
+ mInitApsAfterSmmBaseReloc = FALSE;
//
// Send INIT IPI - SIPI to all APs
@@ -538,17 +545,11 @@ InitializeCpu (
}
mNumberToFinish = mAcpiCpuData.NumberOfCpus - 1;
- //
- // StackStart was updated when APs were waken up in EarlyInitializeCpu.
- // Re-initialize StackAddress to original beginning address.
- //
- mExchangeInfo->StackStart = (VOID *) (UINTN) mAcpiCpuData.StackAddress;
- mExchangeInfo->ApFunction = (VOID *) (UINTN) MPRendezvousProcedure;
//
- // Send INIT IPI - SIPI to all APs
+ // Signal that SMM base relocation is complete and to continue
initialization.
//
- SendInitSipiSipiAllExcludingSelf ((UINT32)mAcpiCpuData.StartupVector);
+ mInitApsAfterSmmBaseReloc = TRUE;
while (mNumberToFinish > 0) {
CpuPause ();
--
2.7.0.windows.1
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