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UefiCpuPkg/MpInitLib: Implementation of MpInitLibSwitchBSP() 

v4:
  1. Simply the internal function SwitchBSPWorker()'s comment header
     due to it is duplicated with MpInitLibSwitchBSP().

v3:
  1. Rename MpInitLibSwitchBsp to MpInitLibSwitchBSP.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Jeff Fan 2016-07-21 21:20:18 +08:00
parent 5c9e099797
commit 41be0da59a
4 changed files with 218 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
View File

@ -389,7 +389,31 @@ MpInitLibSwitchBSP (
IN BOOLEAN EnableOldBSP
)
{
return EFI_UNSUPPORTED;
EFI_STATUS Status;
BOOLEAN OldInterruptState;
//
// Before send both BSP and AP to a procedure to exchange their roles,
// interrupt must be disabled. This is because during the exchange role
// process, 2 CPU may use 1 stack. If interrupt happens, the stack will
// be corrupted, since interrupt return address will be pushed to stack
// by hardware.
//
OldInterruptState = SaveAndDisableInterrupts ();
//
// Mask LINT0 & LINT1 for the old BSP
//
DisableLvtInterrupts ();
Status = SwitchBSPWorker (ProcessorNumber, EnableOldBSP);
//
// Restore interrupt state.
//
SetInterruptState (OldInterruptState);
return Status;
}
/**

134
UefiCpuPkg/Library/MpInitLib/MpLib.c
View File

@ -183,6 +183,26 @@ ExtractProcessorLocation (
Location->Package = (InitialApicId >> (ThreadBits + CoreBits));
}
/**
Worker function for SwitchBSP().
Worker function for SwitchBSP(), assigned to the AP which is intended
to become BSP.
@param[in] Buffer Pointer to CPU MP Data
**/
VOID
EFIAPI
FutureBSPProc (
IN VOID *Buffer
)
{
CPU_MP_DATA *DataInHob;
DataInHob = (CPU_MP_DATA *) Buffer;
AsmExchangeRole (&DataInHob->APInfo, &DataInHob->BSPInfo);
}
/**
Get the Application Processors state.
@ -646,12 +666,21 @@ ApWakeupFunction (
// Invoke AP function here
//
Procedure (Parameter);
if (CpuMpData->SwitchBspFlag) {
//
// Re-get the processor number due to BSP/AP maybe exchange in AP function
//
GetProcessorNumber (CpuMpData, &ProcessorNumber);
CpuMpData->CpuData[ProcessorNumber].ApFunction = 0;
CpuMpData->CpuData[ProcessorNumber].ApFunctionArgument = 0;
} else {
//
// Re-get the CPU APICID and Initial APICID
//
CpuMpData->CpuData[ProcessorNumber].ApicId = GetApicId ();
CpuMpData->CpuData[ProcessorNumber].InitialApicId = GetInitialApicId ();
}
}
SetApState (&CpuMpData->CpuData[ProcessorNumber], CpuStateFinished);
}
}
@ -941,6 +970,7 @@ MpInitLibInitialize (
CpuMpData->CpuCount = 1;
CpuMpData->BspNumber = 0;
CpuMpData->WaitEvent = NULL;
CpuMpData->SwitchBspFlag = FALSE;
CpuMpData->CpuData = (CPU_AP_DATA *) (CpuMpData + 1);
CpuMpData->CpuInfoInHob = (UINT64) (UINTN) (CpuMpData->CpuData + MaxLogicalProcessorNumber);
InitializeSpinLock(&CpuMpData->MpLock);
@ -1103,6 +1133,110 @@ MpInitLibGetProcessorInfo (
return EFI_SUCCESS;
}
/**
Worker function to switch the requested AP to be the BSP from that point onward.
@param[in] ProcessorNumber The handle number of AP that is to become the new BSP.
@param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
enabled AP. Otherwise, it will be disabled.
@retval EFI_SUCCESS BSP successfully switched.
@retval others Failed to switch BSP.
**/
EFI_STATUS
SwitchBSPWorker (
IN UINTN ProcessorNumber,
IN BOOLEAN EnableOldBSP
)
{
CPU_MP_DATA *CpuMpData;
UINTN CallerNumber;
CPU_STATE State;
MSR_IA32_APIC_BASE_REGISTER ApicBaseMsr;
CpuMpData = GetCpuMpData ();
//
// Check whether caller processor is BSP
//
MpInitLibWhoAmI (&CallerNumber);
if (CallerNumber != CpuMpData->BspNumber) {
return EFI_SUCCESS;
}
if (ProcessorNumber >= CpuMpData->CpuCount) {
return EFI_NOT_FOUND;
}
//
// Check whether specified AP is disabled
//
State = GetApState (&CpuMpData->CpuData[ProcessorNumber]);
if (State == CpuStateDisabled) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether ProcessorNumber specifies the current BSP
//
if (ProcessorNumber == CpuMpData->BspNumber) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether specified AP is busy
//
if (State == CpuStateBusy) {
return EFI_NOT_READY;
}
CpuMpData->BSPInfo.State = CPU_SWITCH_STATE_IDLE;
CpuMpData->APInfo.State = CPU_SWITCH_STATE_IDLE;
CpuMpData->SwitchBspFlag = TRUE;
//
// Clear the BSP bit of MSR_IA32_APIC_BASE
//
ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE);
ApicBaseMsr.Bits.BSP = 0;
AsmWriteMsr64 (MSR_IA32_APIC_BASE, ApicBaseMsr.Uint64);
//
// Need to wakeUp AP (future BSP).
//
WakeUpAP (CpuMpData, FALSE, ProcessorNumber, FutureBSPProc, CpuMpData);
AsmExchangeRole (&CpuMpData->BSPInfo, &CpuMpData->APInfo);
//
// Set the BSP bit of MSR_IA32_APIC_BASE on new BSP
//
ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE);
ApicBaseMsr.Bits.BSP = 1;
AsmWriteMsr64 (MSR_IA32_APIC_BASE, ApicBaseMsr.Uint64);
//
// Wait for old BSP finished AP task
//
while (GetApState (&CpuMpData->CpuData[CallerNumber]) != CpuStateFinished) {
CpuPause ();
}
CpuMpData->SwitchBspFlag = FALSE;
//
// Set old BSP enable state
//
if (!EnableOldBSP) {
SetApState (&CpuMpData->CpuData[CallerNumber], CpuStateDisabled);
}
//
// Save new BSP number
//
CpuMpData->BspNumber = (UINT32) ProcessorNumber;
return EFI_SUCCESS;
}
/**
This return the handle number for the calling processor. This service may be

53
UefiCpuPkg/Library/MpInitLib/MpLib.h
View File

@ -42,6 +42,23 @@
0x58eb6a19, 0x3699, 0x4c68, { 0xa8, 0x36, 0xda, 0xcd, 0x8e, 0xdc, 0xad, 0x4a } \
}
//
// The MP data for switch BSP
//
#define CPU_SWITCH_STATE_IDLE 0
#define CPU_SWITCH_STATE_STORED 1
#define CPU_SWITCH_STATE_LOADED 2
//
// CPU exchange information for switch BSP
//
typedef struct {
UINT8 State; // offset 0
UINTN StackPointer; // offset 4 / 8
IA32_DESCRIPTOR Gdtr; // offset 8 / 16
IA32_DESCRIPTOR Idtr; // offset 14 / 26
} CPU_EXCHANGE_ROLE_INFO;
//
// AP loop state when APs are in idle state
// It's value is the same with PcdCpuApLoopMode
@ -198,6 +215,9 @@ struct _CPU_MP_DATA {
AP_INIT_STATE InitFlag;
BOOLEAN X2ApicEnable;
BOOLEAN SwitchBspFlag;
CPU_EXCHANGE_ROLE_INFO BSPInfo;
CPU_EXCHANGE_ROLE_INFO APInfo;
MTRR_SETTINGS MtrrTable;
UINT8 ApLoopMode;
UINT8 ApTargetCState;
@ -242,6 +262,22 @@ AsmGetAddressMap (
OUT MP_ASSEMBLY_ADDRESS_MAP *AddressMap
);
/**
This function is called by both the BSP and the AP which is to become the BSP to
Exchange execution context including stack between them. After return from this
function, the BSP becomes AP and the AP becomes the BSP.
@param[in] MyInfo Pointer to buffer holding the exchanging information for the executing processor.
@param[in] OthersInfo Pointer to buffer holding the exchanging information for the peer.
**/
VOID
EFIAPI
AsmExchangeRole (
IN CPU_EXCHANGE_ROLE_INFO *MyInfo,
IN CPU_EXCHANGE_ROLE_INFO *OthersInfo
);
/**
Get the pointer to CPU MP Data structure.
@ -311,6 +347,23 @@ InitMpGlobalData (
IN CPU_MP_DATA *CpuMpData
);
/**
Worker function to switch the requested AP to be the BSP from that point onward.
@param[in] ProcessorNumber The handle number of AP that is to become the new BSP.
@param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
enabled AP. Otherwise, it will be disabled.
@retval EFI_SUCCESS BSP successfully switched.
@retval others Failed to switch BSP.
**/
EFI_STATUS
SwitchBSPWorker (
IN UINTN ProcessorNumber,
IN BOOLEAN EnableOldBSP
);
/**
Get pointer to CPU MP Data structure from GUIDed HOB.

2
UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
View File

@ -563,7 +563,7 @@ MpInitLibSwitchBSP (
IN BOOLEAN EnableOldBSP
)
{
return EFI_UNSUPPORTED;
return SwitchBSPWorker (ProcessorNumber, EnableOldBSP);
}
/**