From: "Ni, Ray" <ray.ni@intel.com>
To: "Wu, Jiaxin" <jiaxin.wu@intel.com>,
"devel@edk2.groups.io" <devel@edk2.groups.io>
Cc: Laszlo Ersek <lersek@redhat.com>,
"Dong, Eric" <eric.dong@intel.com>,
"Zeng, Star" <star.zeng@intel.com>,
Gerd Hoffmann <kraxel@redhat.com>,
"Kumar, Rahul R" <rahul.r.kumar@intel.com>,
"Kinney, Michael D" <michael.d.kinney@intel.com>
Subject: Re: [edk2-devel] [PATCH v3 1/2] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid BspIndex typecasting
Date: Tue, 6 Feb 2024 08:56:17 +0000 [thread overview]
Message-ID: <MN6PR11MB8244E1E338C0DCBAC5083FD98C462@MN6PR11MB8244.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20240206075804.15152-2-jiaxin.wu@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Thanks,
Ray
> -----Original Message-----
> From: Wu, Jiaxin <jiaxin.wu@intel.com>
> Sent: Tuesday, February 6, 2024 3:58 PM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Laszlo Ersek <lersek@redhat.com>; Dong, Eric
> <eric.dong@intel.com>; Zeng, Star <star.zeng@intel.com>; Gerd Hoffmann
> <kraxel@redhat.com>; Kumar, Rahul R <rahul.r.kumar@intel.com>; Kinney,
> Michael D <michael.d.kinney@intel.com>
> Subject: [PATCH v3 1/2] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid BspIndex
> typecasting
>
> Use MAX_UINT32 directly instead of typecasting from signed
> to unsigned value.
>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Zeng Star <star.zeng@intel.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Cc: Kinney Michael D <michael.d.kinney@intel.com>
> Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
> ---
> UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> index e988ce0542..71d6b0c6d8 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> @@ -694,14 +694,14 @@ BSPHandler (
> // Reset the tokens buffer.
> //
> ResetTokens ();
>
> //
> - // Reset BspIndex to -1, meaning BSP has not been elected.
> + // Reset BspIndex to MAX_UINT32, meaning BSP has not been elected.
> //
> if (FeaturePcdGet (PcdCpuSmmEnableBspElection)) {
> - mSmmMpSyncData->BspIndex = (UINT32)-1;
> + mSmmMpSyncData->BspIndex = MAX_UINT32;
> }
>
> //
> // Allow APs to check in from this point on
> //
> @@ -745,11 +745,11 @@ APHandler (
>
> if (!(*mSmmMpSyncData->InsideSmm)) {
> //
> // BSP timeout in the first round
> //
> - if (mSmmMpSyncData->BspIndex != -1) {
> + if (mSmmMpSyncData->BspIndex != MAX_UINT32) {
> //
> // BSP Index is known
> // Existing AP is in SMI now but BSP not in, so, try bring BSP in SMM.
> //
> BspIndex = mSmmMpSyncData->BspIndex;
> @@ -1654,11 +1654,11 @@ SmiRendezvous (
> //
> // Platform hook fails to determine, use default BSP election method
> //
> InterlockedCompareExchange32 (
> (UINT32 *)&mSmmMpSyncData->BspIndex,
> - (UINT32)-1,
> + MAX_UINT32,
> (UINT32)CpuIndex
> );
> }
> }
> }
> @@ -1852,13 +1852,13 @@ InitializeMpSyncData (
> ZeroMem (mSmmMpSyncData, mSmmMpSyncDataSize);
> mSmmMpSyncData->CpuData = (SMM_CPU_DATA_BLOCK *)((UINT8
> *)mSmmMpSyncData + sizeof (SMM_DISPATCHER_MP_SYNC_DATA));
> mSmmMpSyncData->CandidateBsp = (BOOLEAN *)(mSmmMpSyncData-
> >CpuData + gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus);
> if (FeaturePcdGet (PcdCpuSmmEnableBspElection)) {
> //
> - // Enable BSP election by setting BspIndex to -1
> + // Enable BSP election by setting BspIndex to MAX_UINT32
> //
> - mSmmMpSyncData->BspIndex = (UINT32)-1;
> + mSmmMpSyncData->BspIndex = MAX_UINT32;
> } else {
> //
> // Use NonSMM BSP as SMM BSP
> //
> for (CpuIndex = 0; CpuIndex < gSmmCpuPrivate-
> >SmmCoreEntryContext.NumberOfCpus; CpuIndex++) {
> --
> 2.16.2.windows.1
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next prev parent reply other threads:[~2024-02-06 8:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-06 7:58 [edk2-devel] [PATCH v3 0/2] SMM CPU Optimization Wu, Jiaxin
2024-02-06 7:58 ` [edk2-devel] [PATCH v3 1/2] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid BspIndex typecasting Wu, Jiaxin
2024-02-06 8:56 ` Ni, Ray [this message]
2024-02-06 14:33 ` Laszlo Ersek
2024-02-06 7:58 ` [edk2-devel] [PATCH v3 2/2] UefiCpuPkg/PiSmmCpuDxeSmm: Check BspIndex first before lock cmpxchg Wu, Jiaxin
2024-02-06 8:57 ` Ni, Ray
[not found] ` <03c101da659e$2ad5e530$8081af90$@byosoft.com.cn>
2024-02-23 0:47 ` [edk2-devel] [PATCH v3 0/2] SMM CPU Optimization Wu, Jiaxin
2024-02-23 5:36 ` Wu, Jiaxin
2024-02-23 5:52 ` 回复: " gaoliming via groups.io
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