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UefiCpuPkg/MpInitLib: Do not wakeup AP if only one processor supported

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If MaxLogicalProcessorNumber is only 1, we needn't to wake up APs at all
and needn't to register callback functions.

It could improve boot performance on single supported system.

https://bugzilla.tianocore.org/show_bug.cgi?id=204

Cc: Feng Tian <feng.tian@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
This commit is contained in:
Jeff Fan
2016-11-04 15:45:13 +08:00
parent b028c1021c
commit 14e8137c82
3 changed files with 37 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
UefiCpuPkg/Library/MpInitLib/MpLib.c
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@@ -1143,6 +1143,7 @@ MpInitLibInitialize (
} else {
MaxLogicalProcessorNumber = OldCpuMpData->CpuCount;
}
ASSERT (MaxLogicalProcessorNumber != 0);
AsmGetAddressMap (&AddressMap);
ApResetVectorSize = AddressMap.RendezvousFunnelSize + sizeof (MP_CPU_EXCHANGE_INFO);
@@ -1209,10 +1210,12 @@ MpInitLibInitialize (
MtrrGetAllMtrrs (&CpuMpData->MtrrTable);
if (OldCpuMpData == NULL) {
//
// Wakeup all APs and calculate the processor count in system
//
CollectProcessorCount (CpuMpData);
if (MaxLogicalProcessorNumber > 1) {
//
// Wakeup all APs and calculate the processor count in system
//
CollectProcessorCount (CpuMpData);
}
} else {
//
// APs have been wakeup before, just get the CPU Information
@@ -1238,19 +1241,21 @@ MpInitLibInitialize (
sizeof (CPU_VOLATILE_REGISTERS)
);
}
//
// Wakeup APs to do some AP initialize sync
//
WakeUpAP (CpuMpData, TRUE, 0, ApInitializeSync, CpuMpData);
//
// Wait for all APs finished initialization
//
while (CpuMpData->FinishedCount < (CpuMpData->CpuCount - 1)) {
CpuPause ();
}
CpuMpData->InitFlag = ApInitDone;
for (Index = 0; Index < CpuMpData->CpuCount; Index++) {
SetApState (&CpuMpData->CpuData[Index], CpuStateIdle);
if (MaxLogicalProcessorNumber > 1) {
//
// Wakeup APs to do some AP initialize sync
//
WakeUpAP (CpuMpData, TRUE, 0, ApInitializeSync, CpuMpData);
//
// Wait for all APs finished initialization
//
while (CpuMpData->FinishedCount < (CpuMpData->CpuCount - 1)) {
CpuPause ();
}
CpuMpData->InitFlag = ApInitDone;
for (Index = 0; Index < CpuMpData->CpuCount; Index++) {
SetApState (&CpuMpData->CpuData[Index], CpuStateIdle);
}
}
}