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From: Eric Dong <eric.dong@intel.com>
To: edk2-devel@lists.01.org
Cc: Laszlo Ersek <lersek@redhat.com>, Ruiyu Ni <ruiyu.ni@intel.com>
Subject: [Patch 3/3] UefiCpuPkg/MpInitLib: Load uCode once for one core.
Date: Wed, 11 Jul 2018 19:07:29 +0800	[thread overview]
Message-ID: <20180711110729.12604-4-eric.dong@intel.com> (raw)
In-Reply-To: <20180711110729.12604-1-eric.dong@intel.com>

SDM requires one core only needs to load uCode once.
Also load uCode once can save some time.

This change enables this solution.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Eric Dong <eric.dong@intel.com>
---
 UefiCpuPkg/Library/MpInitLib/Microcode.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/UefiCpuPkg/Library/MpInitLib/Microcode.c b/UefiCpuPkg/Library/MpInitLib/Microcode.c
index 351975e2a2..4586e037d2 100644
--- a/UefiCpuPkg/Library/MpInitLib/Microcode.c
+++ b/UefiCpuPkg/Library/MpInitLib/Microcode.c
@@ -61,6 +61,7 @@ MicrocodeDetect (
   VOID                                    *MicrocodeData;
   MSR_IA32_PLATFORM_ID_REGISTER           PlatformIdMsr;
   UINT32                                  ProcessorFlags;
+  UINT32                                  ThreadId;
 
   if (CpuMpData->MicrocodePatchRegionSize == 0) {
     //
@@ -77,6 +78,14 @@ MicrocodeDetect (
     return;
   }
 
+  GetProcessorLocationByApicId (GetInitialApicId(), NULL, NULL, &ThreadId);
+  if (ThreadId != 0) {
+    //
+    // Skip loading microcode if it is not the first thread in one core.
+    //
+    return;
+  }
+
   ExtendedTableLength = 0;
   //
   // Here data of CPUID leafs have not been collected into context buffer, so
-- 
2.15.0.windows.1



  parent reply	other threads:[~2018-07-11 11:07 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-11 11:07 [Patch 0/3] Optimize load uCode performance Eric Dong
2018-07-11 11:07 ` [Patch 1/3] UefiCpuPkg/MpInitLib: Relocate uCode to memory to save time Eric Dong
2018-07-12  9:26   ` Laszlo Ersek
2018-07-12 10:54     ` Dong, Eric
2018-07-11 11:07 ` [Patch 2/3] UefiCpuPkg/MpInitLib: Use BSP uCode for APs if possible Eric Dong
2018-07-12  9:42   ` Laszlo Ersek
2018-07-12 10:30     ` Dong, Eric
2018-07-11 11:07 ` Eric Dong [this message]
2018-07-12  9:49   ` [Patch 3/3] UefiCpuPkg/MpInitLib: Load uCode once for one core Laszlo Ersek
2018-07-11 16:08 ` [Patch 0/3] Optimize load uCode performance Laszlo Ersek
2018-07-12  9:58 ` Laszlo Ersek
2018-07-12 10:55   ` Dong, Eric

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