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Re-arrange CPU info entry order so MpInitLib 

This patch sorts the CPU info entry according to their thread distances.
It is required to list CPU thread with furthest distance first in MADT
so as to better utilize CPU resources.

Signed-off-by: Maurice Ma <maurice.ma@intel.com>
This commit is contained in:
Maurice Ma 2019-11-08 16:05:28 -08:00
parent 1870fb4fdf
commit 62aa4407d5
1 changed files with 55 additions and 0 deletions
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55
BootloaderCorePkg/Library/MpInitLib/Ia32/MpInitLib.c
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@ -16,6 +16,59 @@ volatile MP_DATA_EXCHANGE_STRUCT mMpDataStruct;
UINT8 *mBackupBuffer;
UINT32 mMpInitPhase = EnumMpInitNull;
/**
Sort the CPU entry according to their thread distances
It is required to list CPU thread with further distance first so as to
fully utilize unshared CPU resources.
@param[in] SysCpuInfo Pointer to the ALL_CPU_INFO structure.
**/
STATIC
VOID
SortSysCpu (
IN ALL_CPU_INFO *SysCpuInfo
)
{
UINT32 Idx1;
UINT32 Idx2;
UINT32 Step;
ALL_CPU_INFO OldSysCpuInfo;
CPU_INFO Temp;
if (SysCpuInfo->CpuCount <= 1) {
return;
}
// Sort by APIC ID first
for (Idx1 = 0; Idx1 < SysCpuInfo->CpuCount - 1; Idx1++) {
for (Idx2 = Idx1; Idx2 < SysCpuInfo->CpuCount; Idx2++) {
if (SysCpuInfo->CpuInfo[Idx1].ApicId > SysCpuInfo->CpuInfo[Idx2].ApicId) {
CopyMem (&Temp, &SysCpuInfo->CpuInfo[Idx1], sizeof(CPU_INFO));
CopyMem (&SysCpuInfo->CpuInfo[Idx1], &SysCpuInfo->CpuInfo[Idx2], sizeof(CPU_INFO));
CopyMem (&SysCpuInfo->CpuInfo[Idx2], &Temp, sizeof(CPU_INFO));
}
}
}
// Keep a backup copy
CopyMem (&OldSysCpuInfo, SysCpuInfo, sizeof (ALL_CPU_INFO));
// Rearrange order per thread distance
Idx2 = 0;
Step = GetPowerOfTwo32 (SysCpuInfo->CpuCount);
for (; Step > 0; Step >>= 1) {
for (Idx1 = 0; Idx1 < SysCpuInfo->CpuCount; Idx1 += Step) {
if ((OldSysCpuInfo.CpuInfo[Idx1].ApicId != 0xFFFFFFFF) && (Idx2 < SysCpuInfo->CpuCount)) {
// Fill the CPU_INFO and mark it as consumed
CopyMem (&SysCpuInfo->CpuInfo[Idx2], &OldSysCpuInfo.CpuInfo[Idx1], sizeof(CPU_INFO));
OldSysCpuInfo.CpuInfo[Idx1].ApicId = 0xFFFFFFFF;
Idx2++;
}
}
}
}
/**
Relocate SMM base for CPU
@ -338,6 +391,8 @@ MpInit (
mSysCpuInfo.CpuCount = CpuCount;
mSysCpuTask.CpuCount = CpuCount;
SortSysCpu (&mSysCpuInfo);
for (Index = 0; Index < CpuCount; Index++) {
DEBUG ((DEBUG_INFO, " CPU %2d APIC ID: %d\n", Index, mSysCpuInfo.CpuInfo[Index].ApicId));
}