Re: [edk2-devel] [PATCH 2/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetBspNumber()

["Ni, Ray" <ray.ni@intel.com>]

Since MpHandOff HOBs are created by the PEI instance of MpInitLib, I am ok that the consumer (DXE instance)
assumes the HOB instances are created in the order of ProcessorIndex.

Please update the patch accordingly with the change of GetMpHandOffHob() I commented to patch #1.

Thanks,
Ray
> -----Original Message-----
> From: Gerd Hoffmann <kraxel@redhat.com>
> Sent: Thursday, February 15, 2024 5:32 PM
> To: devel@edk2.groups.io
> Cc: Oliver Steffen <osteffen@redhat.com>; Ni, Ray <ray.ni@intel.com>; Laszlo
> Ersek <lersek@redhat.com>; Kumar, Rahul R <rahul.r.kumar@intel.com>;
> Gerd Hoffmann <kraxel@redhat.com>
> Subject: [PATCH 2/5] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to
> GetBspNumber()
> 
> Remove the MpHandOff parameter.  This is not useful in case multiple
> HOBs are present in the system.  The function will use GetMpHandOffHob()
> to loop over all HOBs instead.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  UefiCpuPkg/Library/MpInitLib/MpLib.c | 26 ++++++++++++++++----------
>  1 file changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c
> b/UefiCpuPkg/Library/MpInitLib/MpLib.c
> index e0a2366073a7..8e6cf50ed171 100644
> --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
> @@ -1894,26 +1894,32 @@ CheckAllAPs (
>  /**
>    This function Get BspNumber.
> 
> -  @param[in] MpHandOff        Pointer to MpHandOff
>    @return                     BspNumber
>  **/
>  UINT32
>  GetBspNumber (
> -  IN CONST MP_HAND_OFF  *MpHandOff
> +  VOID
>    )
>  {
> -  UINT32  ApicId;
> -  UINT32  BspNumber;
> -  UINT32  Index;
> +  UINT32       ApicId;
> +  UINT32       BspNumber;
> +  UINT32       Index;
> +  MP_HAND_OFF  *MpHandOff;
> 
>    //
>    // Get the processor number for the BSP
>    //
>    BspNumber = MAX_UINT32;
>    ApicId    = GetInitialApicId ();
> -  for (Index = 0; Index < MpHandOff->CpuCount; Index++) {
> -    if (MpHandOff->Info[Index].ApicId == ApicId) {
> -      BspNumber = Index;
> +
> +  for (MpHandOff = GetMpHandOffHob (0);
> +       MpHandOff != NULL;
> +       MpHandOff = GetMpHandOffHob (MpHandOff->ProcessorIndex +
> MpHandOff->CpuCount))
> +  {
> +    for (Index = 0; Index < MpHandOff->CpuCount; Index++) {
> +      if (MpHandOff->Info[Index].ApicId == ApicId) {
> +        BspNumber = MpHandOff->ProcessorIndex + Index;
> +      }
>      }
>    }
> 
> @@ -1941,7 +1947,7 @@ SwitchApContext (
>    UINTN   Index;
>    UINT32  BspNumber;
> 
> -  BspNumber = GetBspNumber (MpHandOff);
> +  BspNumber = GetBspNumber ();
> 
>    for (Index = 0; Index < MpHandOff->CpuCount; Index++) {
>      if (Index != BspNumber) {
> @@ -2191,7 +2197,7 @@ MpInitLibInitialize (
>      }
> 
>      CpuMpData->CpuCount  = MpHandOff->CpuCount;
> -    CpuMpData->BspNumber = GetBspNumber (MpHandOff);
> +    CpuMpData->BspNumber = GetBspNumber ();
>      CpuInfoInHob         = (CPU_INFO_IN_HOB
> *)(UINTN)CpuMpData->CpuInfoInHob;
>      for (Index = 0; Index < CpuMpData->CpuCount; Index++) {
>        InitializeSpinLock (&CpuMpData->CpuData[Index].ApLock);
> --
> 2.43.1



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