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UefiCpuPkg/PiSmmCpu: Don't allocate Token for SmmStartupThisAp 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3199

When Token points to mSmmStartupThisApToken, this routine is called
from SmmStartupThisAp() in non-blocking mode due to
PcdCpuSmmBlockStartupThisAp == FALSE.

In this case, caller wants to startup AP procedure in non-blocking
mode and cannot get the completion status from the Token because there
is no way to return the Token to caller from SmmStartupThisAp().
Caller needs to use its specific way to query the completion status.

There is no need to allocate a token for such case so the 3 overheads
can be avoided:
1. Call AllocateTokenBuffer() when there is no free token.
2. Get a free token from the token buffer.
3. Call ReleaseToken() in APHandler().

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
This commit is contained in:
Ray Ni 2021-01-27 15:45:25 +08:00 committed by mergify[bot]
parent edd46cd407
commit 54ba08c6b6
1 changed files with 23 additions and 7 deletions
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26
UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
View File

@ -1,7 +1,7 @@
/** @file
SMM MP service implementation
Copyright (c) 2009 - 2020, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@ -22,6 +22,7 @@ UINTN mSemaphoreSize;
SPIN_LOCK *mPFLock = NULL;
SMM_CPU_SYNC_MODE mCpuSmmSyncMode;
BOOLEAN mMachineCheckSupported = FALSE;
MM_COMPLETION mSmmStartupThisApToken;
extern UINTN mSmmShadowStackSize;
@ -1240,10 +1241,27 @@ InternalSmmStartupThisAp (
mSmmMpSyncData->CpuData[CpuIndex].Procedure = Procedure;
mSmmMpSyncData->CpuData[CpuIndex].Parameter = ProcArguments;
if (Token != NULL) {
ProcToken= GetFreeToken (1);
if (Token != &mSmmStartupThisApToken) {
//
// When Token points to mSmmStartupThisApToken, this routine is called
// from SmmStartupThisAp() in non-blocking mode (PcdCpuSmmBlockStartupThisAp == FALSE).
//
// In this case, caller wants to startup AP procedure in non-blocking
// mode and cannot get the completion status from the Token because there
// is no way to return the Token to caller from SmmStartupThisAp().
// Caller needs to use its implementation specific way to query the completion status.
//
// There is no need to allocate a token for such case so the 3 overheads
// can be avoided:
// 1. Call AllocateTokenBuffer() when there is no free token.
// 2. Get a free token from the token buffer.
// 3. Call ReleaseToken() in APHandler().
//
ProcToken = GetFreeToken (1);
mSmmMpSyncData->CpuData[CpuIndex].Token = ProcToken;
*Token = (MM_COMPLETION)ProcToken->SpinLock;
}
}
mSmmMpSyncData->CpuData[CpuIndex].Status = CpuStatus;
if (mSmmMpSyncData->CpuData[CpuIndex].Status != NULL) {
*mSmmMpSyncData->CpuData[CpuIndex].Status = EFI_NOT_READY;
@ -1474,8 +1492,6 @@ SmmStartupThisAp (
IN OUT VOID *ProcArguments OPTIONAL
)
{
MM_COMPLETION Token;
gSmmCpuPrivate->ApWrapperFunc[CpuIndex].Procedure = Procedure;
gSmmCpuPrivate->ApWrapperFunc[CpuIndex].ProcedureArgument = ProcArguments;
@ -1486,7 +1502,7 @@ SmmStartupThisAp (
ProcedureWrapper,
CpuIndex,
&gSmmCpuPrivate->ApWrapperFunc[CpuIndex],
FeaturePcdGet (PcdCpuSmmBlockStartupThisAp) ? NULL : &Token,
FeaturePcdGet (PcdCpuSmmBlockStartupThisAp) ? NULL : &mSmmStartupThisApToken,
0,
NULL
);