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List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: 85Nk8ycHsCMNGv6gof4iEDNOx7686176AA= Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=cWpJp5Ug; spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=intel.com (policy=none); arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") +Mike for this review.=20 > -----Original Message----- > From: devel@edk2.groups.io On Behalf Of Wu, > Jiaxin > Sent: Wednesday, August 9, 2023 5:04 PM > To: devel@edk2.groups.io > Cc: Dong, Eric ; Ni, Ray ; Zeng, S= tar > ; Kumar, Rahul R ; Gerd > Hoffmann > Subject: [edk2-devel] [PATCH v1] UefiCpuPkg/SmmCpu: Refine semaphore > sync between BSP and AP >=20 > For SMM CPU semaphore sync, there is no need atomic semaphore > operation, just use the flag to indicate it has complete the > wait/release. Based on this, this patch is to refine 2 functions > (WaitForAllAPs & ReleaseAllAPs) and define 2 new functions > (WaitForBsp & ReleaseBsp) used for the semaphore sync between > BSP & AP. >=20 > Sync flow like below: > 1. BSP to Release All APs ---> 1. AP to Wait BSP > ReleaseAllAPs () WaitForBsp > 2. BSP to Wait All APs <--- 2. AP to Release BSP > WaitForAllAPs () ReleaseBsp >=20 > With this change, SMM CPU semaphore sync for SMI exit performance > will be significant improved. >=20 > Cc: Eric Dong > Cc: Ray Ni > Cc: Zeng Star > Cc: Rahul Kumar > Cc: Gerd Hoffmann > Signed-off-by: Jiaxin Wu > --- > UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 68 > ++++++++++++++++++++++++++--------- > 1 file changed, 51 insertions(+), 17 deletions(-) >=20 > diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c > b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c > index 25d058c5b9..0bf460e81c 100644 > --- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c > +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c > @@ -120,11 +120,11 @@ LockdownSemaphore ( >=20 > return Value; > } >=20 > /** > - Wait all APs to performs an atomic compare exchange operation to relea= se > semaphore. > + Used for BSP to wait all APs. >=20 > @param NumberOfAPs AP number >=20 > **/ > VOID > @@ -133,18 +133,19 @@ WaitForAllAPs ( > ) > { > UINTN BspIndex; >=20 > BspIndex =3D mSmmMpSyncData->BspIndex; > - while (NumberOfAPs-- > 0) { > - WaitForSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + while (NumberOfAPs !=3D *mSmmMpSyncData->CpuData[BspIndex].Run) { > + CpuPause (); > } > + > + *mSmmMpSyncData->CpuData[BspIndex].Run =3D 0; > } >=20 > /** > - Performs an atomic compare exchange operation to release semaphore > - for each AP. > + Used for BSP to release all APs. >=20 > **/ > VOID > ReleaseAllAPs ( > VOID > @@ -152,15 +153,48 @@ ReleaseAllAPs ( > { > UINTN Index; >=20 > for (Index =3D 0; Index < mMaxNumberOfCpus; Index++) { > if (IsPresentAp (Index)) { > - ReleaseSemaphore (mSmmMpSyncData->CpuData[Index].Run); > + ASSERT (*mSmmMpSyncData->CpuData[Index].Run =3D=3D 0); > + *mSmmMpSyncData->CpuData[Index].Run =3D 1; > } > } > } >=20 > +/** > + Used for Ap to wait BSP. > + > + @param ApSem IN: 32-bit unsigned integer > + OUT: original integer 0 > +**/ > +VOID > +WaitForBsp ( > + IN OUT volatile UINT32 *ApSem > + ) > +{ > + while (*ApSem =3D=3D 0) { > + CpuPause (); > + } > + > + *ApSem =3D 0; > +} > + > +/** > + Used for Ap to release BSP. > + > + @param BspSem IN: 32-bit unsigned integer > + OUT: original integer + 1 > +**/ > +VOID > +ReleaseBsp ( > + IN OUT volatile UINT32 *BspSem > + ) > +{ > + InterlockedIncrement (BspSem); > +} > + > /** > Check whether the index of CPU perform the package level register > programming during System Management Mode initialization. >=20 > The index of Processor specified by > mPackageFirstThreadIndex[PackageIndex] > @@ -898,50 +932,50 @@ APHandler ( >=20 > if ((SyncMode =3D=3D SmmCpuSyncModeTradition) || > SmmCpuFeaturesNeedConfigureMtrrs ()) { > // > // Notify BSP of arrival at this point > // > - ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + ReleaseBsp (mSmmMpSyncData->CpuData[BspIndex].Run); > } >=20 > if (SmmCpuFeaturesNeedConfigureMtrrs ()) { > // > // Wait for the signal from BSP to backup MTRRs > // > - WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run); > + WaitForBsp (mSmmMpSyncData->CpuData[CpuIndex].Run); >=20 > // > // Backup OS MTRRs > // > MtrrGetAllMtrrs (&Mtrrs); >=20 > // > // Signal BSP the completion of this AP > // > - ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + ReleaseBsp (mSmmMpSyncData->CpuData[BspIndex].Run); >=20 > // > // Wait for BSP's signal to program MTRRs > // > - WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run); > + WaitForBsp (mSmmMpSyncData->CpuData[CpuIndex].Run); >=20 > // > // Replace OS MTRRs with SMI MTRRs > // > ReplaceOSMtrrs (CpuIndex); >=20 > // > // Signal BSP the completion of this AP > // > - ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + ReleaseBsp (mSmmMpSyncData->CpuData[BspIndex].Run); > } >=20 > while (TRUE) { > // > // Wait for something to happen > // > - WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run); > + WaitForBsp (mSmmMpSyncData->CpuData[CpuIndex].Run); >=20 > // > // Check if BSP wants to exit SMM > // > if (!(*mSmmMpSyncData->InsideSmm)) { > @@ -977,16 +1011,16 @@ APHandler ( >=20 > if (SmmCpuFeaturesNeedConfigureMtrrs ()) { > // > // Notify BSP the readiness of this AP to program MTRRs > // > - ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + ReleaseBsp (mSmmMpSyncData->CpuData[BspIndex].Run); >=20 > // > // Wait for the signal from BSP to program MTRRs > // > - WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run); > + WaitForBsp (mSmmMpSyncData->CpuData[CpuIndex].Run); >=20 > // > // Restore OS MTRRs > // > SmmCpuFeaturesReenableSmrr (); > @@ -994,26 +1028,26 @@ APHandler ( > } >=20 > // > // Notify BSP the readiness of this AP to Reset states/semaphore for t= his > processor > // > - ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + ReleaseBsp (mSmmMpSyncData->CpuData[BspIndex].Run); >=20 > // > // Wait for the signal from BSP to Reset states/semaphore for this pro= cessor > // > - WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run); > + WaitForBsp (mSmmMpSyncData->CpuData[CpuIndex].Run); >=20 > // > // Reset states/semaphore for this processor > // > *(mSmmMpSyncData->CpuData[CpuIndex].Present) =3D FALSE; >=20 > // > // Notify BSP the readiness of this AP to exit SMM > // > - ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run); > + ReleaseBsp (mSmmMpSyncData->CpuData[BspIndex].Run); > } >=20 > /** > Checks whether the input token is the current used token. >=20 > -- > 2.16.2.windows.1 >=20 >=20 >=20 >=20 >=20 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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