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authorJeff Fan <jeff.fan@intel.com>2015-12-18 03:25:32 +0000
committervanjeff <vanjeff@Edk2>2015-12-18 03:25:32 +0000
commitc87e41b4452f0b5f8f14505b2ca5238f2598ea23 (patch)
treee68a0042d5fd9241de78e9044e127daba6d9946c /UefiCpuPkg
parente001e11f90afd78851defc78590edfe1c3355675 (diff)
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UefiCpuPkg/CpuMpPei: Place APs in proper loop mode after AP execution
After AP function is executed, we will place AP in proper loop mode. Because AP maybe waken up by SMI or other reasons. We need to read signature in monitor buffer to check if APs is waken up by BSP. If it is not waken up by BSP, we will continue to place them into proper loop mode. Contributed-under: TianoCore Contribution Agreement 1.0 Cc: Feng Tian <feng.tian@intel.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Tested-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19345 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'UefiCpuPkg')
-rw-r--r--UefiCpuPkg/CpuMpPei/CpuMpPei.c148
-rw-r--r--UefiCpuPkg/CpuMpPei/CpuMpPei.h3
-rw-r--r--UefiCpuPkg/CpuMpPei/CpuMpPei.inf1
3 files changed, 106 insertions, 46 deletions
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.c b/UefiCpuPkg/CpuMpPei/CpuMpPei.c
index b8fa5118b4..ba82ba4218 100644
--- a/UefiCpuPkg/CpuMpPei/CpuMpPei.c
+++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.c
@@ -273,68 +273,124 @@ ApCFunction (
UINTN ProcessorNumber;
EFI_AP_PROCEDURE Procedure;
UINTN BistData;
+ volatile UINT32 *ApStartupSignalBuffer;
PeiCpuMpData = ExchangeInfo->PeiCpuMpData;
- if (PeiCpuMpData->InitFlag) {
- ProcessorNumber = NumApsExecuting;
- //
- // Sync BSP's Control registers to APs
- //
- RestoreVolatileRegisters (&PeiCpuMpData->CpuData[0].VolatileRegisters, FALSE);
- //
- // This is first time AP wakeup, get BIST information from AP stack
- //
- BistData = *(UINTN *) (PeiCpuMpData->Buffer + ProcessorNumber * PeiCpuMpData->CpuApStackSize - sizeof (UINTN));
- PeiCpuMpData->CpuData[ProcessorNumber].Health.Uint32 = (UINT32) BistData;
- PeiCpuMpData->CpuData[ProcessorNumber].ApicId = GetInitialApicId ();
- if (PeiCpuMpData->CpuData[ProcessorNumber].ApicId >= 0xFF) {
+ while (TRUE) {
+ if (PeiCpuMpData->InitFlag) {
+ ProcessorNumber = NumApsExecuting;
+ //
+ // Sync BSP's Control registers to APs
+ //
+ RestoreVolatileRegisters (&PeiCpuMpData->CpuData[0].VolatileRegisters, FALSE);
+ //
+ // This is first time AP wakeup, get BIST information from AP stack
+ //
+ BistData = *(UINTN *) (PeiCpuMpData->Buffer + ProcessorNumber * PeiCpuMpData->CpuApStackSize - sizeof (UINTN));
+ PeiCpuMpData->CpuData[ProcessorNumber].Health.Uint32 = (UINT32) BistData;
+ PeiCpuMpData->CpuData[ProcessorNumber].ApicId = GetInitialApicId ();
+ if (PeiCpuMpData->CpuData[ProcessorNumber].ApicId >= 0xFF) {
+ //
+ // Set x2APIC mode if there are any logical processor reporting
+ // an APIC ID of 255 or greater.
+ //
+ AcquireSpinLock(&PeiCpuMpData->MpLock);
+ PeiCpuMpData->X2ApicEnable = TRUE;
+ ReleaseSpinLock(&PeiCpuMpData->MpLock);
+ }
+ //
+ // Sync BSP's Mtrr table to all wakeup APs and load microcode on APs.
+ //
+ MtrrSetAllMtrrs (&PeiCpuMpData->MtrrTable);
+ MicrocodeDetect ();
+ PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateIdle;
+ } else {
//
- // Set x2APIC mode if there are any logical processor reporting
- // an APIC ID of 255 or greater.
+ // Execute AP function if AP is not disabled
//
- AcquireSpinLock(&PeiCpuMpData->MpLock);
- PeiCpuMpData->X2ApicEnable = TRUE;
- ReleaseSpinLock(&PeiCpuMpData->MpLock);
+ GetProcessorNumber (PeiCpuMpData, &ProcessorNumber);
+ if (PeiCpuMpData->ApLoopMode == ApInHltLoop) {
+ //
+ // Restore AP's volatile registers saved
+ //
+ RestoreVolatileRegisters (&PeiCpuMpData->CpuData[ProcessorNumber].VolatileRegisters, TRUE);
+ }
+
+ if ((PeiCpuMpData->CpuData[ProcessorNumber].State != CpuStateDisabled) &&
+ (PeiCpuMpData->ApFunction != 0)) {
+ PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateBusy;
+ Procedure = (EFI_AP_PROCEDURE)(UINTN)PeiCpuMpData->ApFunction;
+ //
+ // Invoke AP function here
+ //
+ Procedure ((VOID *)(UINTN)PeiCpuMpData->ApFunctionArgument);
+ //
+ // Re-get the processor number due to BSP/AP maybe exchange in AP function
+ //
+ GetProcessorNumber (PeiCpuMpData, &ProcessorNumber);
+ PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateIdle;
+ }
}
+
//
- // Sync BSP's Mtrr table to all wakeup APs and load microcode on APs.
+ // AP finished executing C code
//
- MtrrSetAllMtrrs (&PeiCpuMpData->MtrrTable);
- MicrocodeDetect ();
- PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateIdle;
- } else {
+ InterlockedIncrement ((UINT32 *)&PeiCpuMpData->FinishedCount);
+
//
- // Execute AP function if AP is not disabled
+ // Place AP is specified loop mode
//
- GetProcessorNumber (PeiCpuMpData, &ProcessorNumber);
+ if (PeiCpuMpData->ApLoopMode == ApInHltLoop) {
+ //
+ // Save AP volatile registers
+ //
+ SaveVolatileRegisters (&PeiCpuMpData->CpuData[ProcessorNumber].VolatileRegisters);
+ //
+ // Place AP in Hlt-loop
+ //
+ while (TRUE) {
+ DisableInterrupts ();
+ CpuSleep ();
+ CpuPause ();
+ }
+ }
+ ApStartupSignalBuffer = PeiCpuMpData->CpuData[ProcessorNumber].StartupApSignal;
//
- // Restore AP's volatile registers saved
+ // Clear AP start-up signal
//
- RestoreVolatileRegisters (&PeiCpuMpData->CpuData[ProcessorNumber].VolatileRegisters, TRUE);
+ *ApStartupSignalBuffer = 0;
+ while (TRUE) {
+ DisableInterrupts ();
+ if (PeiCpuMpData->ApLoopMode == ApInMwaitLoop) {
+ //
+ // Place AP in Mwait-loop
+ //
+ AsmMonitor ((UINTN)ApStartupSignalBuffer, 0, 0);
+ if (*ApStartupSignalBuffer != WAKEUP_AP_SIGNAL) {
+ //
+ // If AP start-up signal is not set, place AP into
+ // the maximum C-state
+ //
+ AsmMwait (PeiCpuMpData->ApTargetCState << 4, 0);
+ }
+ } else if (PeiCpuMpData->ApLoopMode == ApInRunLoop) {
+ //
+ // Place AP in Run-loop
+ //
+ CpuPause ();
+ } else {
+ ASSERT (FALSE);
+ }
- if ((PeiCpuMpData->CpuData[ProcessorNumber].State != CpuStateDisabled) &&
- (PeiCpuMpData->ApFunction != 0)) {
- PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateBusy;
- Procedure = (EFI_AP_PROCEDURE)(UINTN)PeiCpuMpData->ApFunction;
//
- // Invoke AP function here
+ // If AP start-up signal is written, AP is waken up
+ // otherwise place AP in loop again
//
- Procedure ((VOID *)(UINTN)PeiCpuMpData->ApFunctionArgument);
- PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateIdle;
+ if (*ApStartupSignalBuffer == WAKEUP_AP_SIGNAL) {
+ break;
+ }
}
}
-
- //
- // AP finished executing C code
- //
- InterlockedIncrement ((UINT32 *)&PeiCpuMpData->FinishedCount);
-
- //
- // Save AP volatile registers
- //
- SaveVolatileRegisters (&PeiCpuMpData->CpuData[ProcessorNumber].VolatileRegisters);
-
- AsmCliHltLoop ();
}
/**
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.h b/UefiCpuPkg/CpuMpPei/CpuMpPei.h
index a22bae7005..47038c2825 100644
--- a/UefiCpuPkg/CpuMpPei/CpuMpPei.h
+++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.h
@@ -38,6 +38,7 @@
#include <Library/SynchronizationLib.h>
#include <Library/TimerLib.h>
#include <Library/UefiCpuLib.h>
+#include <Library/CpuLib.h>
#include "Microcode.h"
@@ -50,6 +51,8 @@ typedef enum {
CpuStateDisabled
} CPU_STATE;
+#define WAKEUP_AP_SIGNAL SIGNATURE_32 ('S', 'T', 'A', 'P')
+
typedef enum {
ApInHltLoop = 1,
ApInMwaitLoop = 2,
diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.inf b/UefiCpuPkg/CpuMpPei/CpuMpPei.inf
index 4a5cfe75ff..ec353aed7d 100644
--- a/UefiCpuPkg/CpuMpPei/CpuMpPei.inf
+++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.inf
@@ -66,6 +66,7 @@
SynchronizationLib
TimerLib
UefiCpuLib
+ CpuLib
[Ppis]
gEfiPeiMpServicesPpiGuid ## PRODUCES