I do not have strong opinion on this considering it is an IO driver. The call of GetTimeInNanoSecond() is also likely to invoke GetPerformanceCounterProperties() call.
I will let the patch owner to decide on the open raised below. Best Regards, Hao Wu > -----Original Message----- > From: Mike Maslenkin <mike.maslen...@gmail.com> > Sent: Thursday, September 7, 2023 3:36 PM > To: devel@edk2.groups.io; Wu, Hao A <hao.a...@intel.com> > Cc: Henz, Patrick <patrick.h...@hpe.com> > Subject: Re: [edk2-devel] [PATCH v2] MdeModulePkg/XhciDxe: Use > Performance Timer for XHCI Timeouts > > Hello Hao Wu, > > Isn't GetPerformanceCounterProperties (&StartValue, &EndValue) call too > "heavy" for XHCI paths? > May be it's better to cache timer direction once? > I'm asking in a context of PcAtChipsetPkg/Library/AcpiTimerLib > instance used by a number of Intel's platform in edk-platforms. > For this library GetPerformanceCounterProperties finally calls > InternalCalculateTscFrequency, that isn't simple. > > Regards, > Mike > > On Thu, Sep 7, 2023 at 4:27 AM Wu, Hao A <hao.a...@intel.com> wrote: > > > > Sorry for the late response. > > Reviewed-by: Hao A Wu <hao.a...@intel.com> > > > > Best Regards, > > Hao Wu > > > > > -----Original Message----- > > > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Henz, > > > Patrick > > > Sent: Thursday, September 7, 2023 4:37 AM > > > To: devel@edk2.groups.io > > > Subject: Re: [edk2-devel] [PATCH v2] MdeModulePkg/XhciDxe: Use > > > Performance Timer for XHCI Timeouts > > > > > > I sent this patch out a few weeks ago now but haven't seen a reply, > > > just checking in to make sure it didn't get missed. > > > > > > Thanks, > > > Patrick Henz > > > > > > -----Original Message----- > > > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Henz, > > > Patrick > > > Sent: Monday, August 14, 2023 10:52 AM > > > To: devel@edk2.groups.io > > > Cc: Henz, Patrick <patrick.h...@hpe.com> > > > Subject: [edk2-devel] [PATCH v2] MdeModulePkg/XhciDxe: Use > > > Performance Timer for XHCI Timeouts > > > > > > REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2948 > > > > > > XhciDxe uses the timer functionality provided by the boot services > > > table to detect timeout conditions. This breaks the driver's > > > ExitBootServices call back, as CoreExitBootServices halts the timer > > > before signaling the ExitBootServices event. If the host controller > > > fails to halt in the call back, the timeout condition will never > > > occur and the boot gets stuck in an indefinite spin loop. Use the > > > free running timer provided by TimerLib to calculate timeouts, avoiding > the potential hang. > > > > > > Signed-off-by: Patrick Henz <patrick.h...@hpe.com> > > > Reviewed-by: > > > --- > > > MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c | 56 +++++++++++++++++++ > > > MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h | 22 ++++++++ > > > MdeModulePkg/Bus/Pci/XhciDxe/XhciDxe.inf | 2 + > > > MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c | 67 +++++++++-------------- > > > MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c | 68 > > > +++++++++--------------- > > > 5 files changed, 129 insertions(+), 86 deletions(-) > > > > > > diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c > > > b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c > > > index 62682dd27c..1dcbe20512 100644 > > > --- a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c > > > +++ b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c > > > @@ -1,6 +1,7 @@ > > > /** @file > > > The XHCI controller driver. > > > > > > +(C) Copyright 2023 Hewlett Packard Enterprise Development LP<BR> > > > Copyright (c) 2011 - 2022, Intel Corporation. All rights > > > reserved.<BR> > > > SPDX-License-Identifier: BSD-2-Clause-Patent > > > > > > @@ -2294,3 +2295,58 @@ XhcDriverBindingStop ( > > > > > > return EFI_SUCCESS; > > > } > > > + > > > +/** > > > + Computes and returns the elapsed time in nanoseconds since > > > + PreviousTick. The value of PreviousTick is overwritten with the > > > + current performance counter value. > > > + > > > + @param PreviousTick Pointer to PreviousTick count. > > > + @return The elapsed time in nanoseconds since PreviousCount. > > > + PreviousCount is overwritten with the current performance > > > + counter value. > > > +**/ > > > +UINT64 > > > +XhcGetElapsedTime ( > > > + IN OUT UINT64 *PreviousTick > > > + ) > > > +{ > > > + UINT64 StartValue; > > > + UINT64 EndValue; > > > + UINT64 CurrentTick; > > > + UINT64 Delta; > > > + > > > + GetPerformanceCounterProperties (&StartValue, &EndValue); > > > + > > > + CurrentTick = GetPerformanceCounter (); > > > + > > > + // > > > + // Determine if the counter is counting up or down // if > > > + (StartValue < EndValue) { > > > + // > > > + // Counter counts upwards, check for an overflow condition > > > + // > > > + if (*PreviousTick > CurrentTick) { > > > + Delta = (EndValue - *PreviousTick) + CurrentTick; > > > + } else { > > > + Delta = CurrentTick - *PreviousTick; > > > + } > > > + } else { > > > + // > > > + // Counter counts downwards, check for an underflow condition > > > + // > > > + if (*PreviousTick < CurrentTick) { > > > + Delta = (StartValue - CurrentTick) + *PreviousTick; > > > + } else { > > > + Delta = *PreviousTick - CurrentTick; > > > + } > > > + } > > > + > > > + // > > > + // Set PreviousTick to CurrentTick // *PreviousTick = > > > + CurrentTick; > > > + > > > + return GetTimeInNanoSecond (Delta); } > > > diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h > > > b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h > > > index ca223bd20c..77feb66647 100644 > > > --- a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h > > > +++ b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.h > > > @@ -2,6 +2,7 @@ > > > > > > Provides some data structure definitions used by the XHCI host > > > controller driver. > > > > > > +(C) Copyright 2023 Hewlett Packard Enterprise Development LP<BR> > > > Copyright (c) 2011 - 2017, Intel Corporation. All rights > > > reserved.<BR> Copyright (c) Microsoft Corporation.<BR> > > > SPDX-License-Identifier: BSD-2-Clause-Patent @@ -26,6 +27,7 @@ > > > SPDX- > > > License-Identifier: BSD-2-Clause-Patent #include > > > <Library/UefiLib.h> #include <Library/DebugLib.h> #include > > > <Library/ReportStatusCodeLib.h> > > > +#include <Library/TimerLib.h> > > > > > > #include <IndustryStandard/Pci.h> > > > > > > @@ -37,6 +39,10 @@ typedef struct _USB_DEV_CONTEXT > USB_DEV_CONTEXT; > > > #include "ComponentName.h" > > > #include "UsbHcMem.h" > > > > > > +// > > > +// Converts a count from microseconds to nanoseconds // #define > > > +XHC_MICROSECOND_TO_NANOSECOND(Time) ((UINT64)(Time) * 1000) > > > // > > > // The unit is microsecond, setting it as 1us. > > > // > > > @@ -720,4 +726,20 @@ XhcAsyncIsochronousTransfer ( > > > IN VOID *Context > > > ); > > > > > > +/** > > > + Computes and returns the elapsed time in nanoseconds since > > > + PreviousTick. The value of PreviousTick is overwritten with the > > > + current performance counter value. > > > + > > > + @param PreviousTick Pointer to PreviousTick count. > > > + before calling this function. > > > + @return The elapsed time in nanoseconds since PreviousCount. > > > + PreviousCount is overwritten with the current performance > > > + counter value. > > > +**/ > > > +UINT64 > > > +XhcGetElapsedTime ( > > > + IN OUT UINT64 *PreviousTick > > > + ); > > > + > > > #endif > > > diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/XhciDxe.inf > > > b/MdeModulePkg/Bus/Pci/XhciDxe/XhciDxe.inf > > > index 5865d86822..18ef87916a 100644 > > > --- a/MdeModulePkg/Bus/Pci/XhciDxe/XhciDxe.inf > > > +++ b/MdeModulePkg/Bus/Pci/XhciDxe/XhciDxe.inf > > > @@ -3,6 +3,7 @@ > > > # It implements the interfaces of monitoring the status of all > > > ports and transferring # Control, Bulk, Interrupt and Isochronous > > > requests to those attached usb LS/FS/HS/SS devices. > > > # > > > +# (C) Copyright 2023 Hewlett Packard Enterprise Development LP<BR> > > > # Copyright (c) 2011 - 2018, Intel Corporation. All rights > > > reserved.<BR> # # > > > SPDX-License-Identifier: BSD-2-Clause-Patent @@ -54,6 +55,7 @@ > > > BaseMemoryLib > > > DebugLib > > > ReportStatusCodeLib > > > + TimerLib > > > > > > [Guids] > > > gEfiEventExitBootServicesGuid ## SOMETIMES_CONSUMES ## > > > Event > > > diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c > > > b/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c > > > index 5700fc5fb8..07e57772b6 100644 > > > --- a/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c > > > +++ b/MdeModulePkg/Bus/Pci/XhciDxe/XhciReg.c > > > @@ -2,6 +2,7 @@ > > > > > > The XHCI register operation routines. > > > > > > +(C) Copyright 2023 Hewlett Packard Enterprise Development LP<BR> > > > Copyright (c) 2011 - 2017, Intel Corporation. All rights > > > reserved.<BR> > > > SPDX-License-Identifier: BSD-2-Clause-Patent > > > > > > @@ -417,15 +418,14 @@ XhcClearOpRegBit ( > > > Wait the operation register's bit as specified by Bit > > > to become set (or clear). > > > > > > - @param Xhc The XHCI Instance. > > > - @param Offset The offset of the operation register. > > > - @param Bit The bit of the register to wait for. > > > - @param WaitToSet Wait the bit to set or clear. > > > - @param Timeout The time to wait before abort (in > > > millisecond, > > > ms). > > > + @param Xhc The XHCI Instance. > > > + @param Offset The offset of the operation register. > > > + @param Bit The bit of the register to wait for. > > > + @param WaitToSet Wait the bit to set or clear. > > > + @param Timeout The time to wait before abort (in millisecond, > > > ms). > > > > > > - @retval EFI_SUCCESS The bit successfully changed by host > controller. > > > - @retval EFI_TIMEOUT The time out occurred. > > > - @retval EFI_OUT_OF_RESOURCES Memory for the timer event could > not > > > be allocated. > > > + @retval EFI_SUCCESS The bit successfully changed by host controller. > > > + @retval EFI_TIMEOUT The time out occurred. > > > > > > **/ > > > EFI_STATUS > > > @@ -437,54 +437,35 @@ XhcWaitOpRegBit ( > > > IN UINT32 Timeout > > > ) > > > { > > > - EFI_STATUS Status; > > > - EFI_EVENT TimeoutEvent; > > > - > > > - TimeoutEvent = NULL; > > > + UINT64 TimeoutTime; > > > + UINT64 ElapsedTime; > > > + UINT64 TimeDelta; > > > + UINT64 CurrentTick; > > > > > > if (Timeout == 0) { > > > return EFI_TIMEOUT; > > > } > > > > > > - Status = gBS->CreateEvent ( > > > - EVT_TIMER, > > > - TPL_CALLBACK, > > > - NULL, > > > - NULL, > > > - &TimeoutEvent > > > - ); > > > - > > > - if (EFI_ERROR (Status)) { > > > - goto DONE; > > > - } > > > - > > > - Status = gBS->SetTimer ( > > > - TimeoutEvent, > > > - TimerRelative, > > > - EFI_TIMER_PERIOD_MILLISECONDS (Timeout) > > > - ); > > > - > > > - if (EFI_ERROR (Status)) { > > > - goto DONE; > > > - } > > > + TimeoutTime = XHC_MICROSECOND_TO_NANOSECOND > ((UINT64)Timeout > > > * > > > + XHC_1_MILLISECOND); ElapsedTime = 0; CurrentTick = > > > + GetPerformanceCounter (); > > > > > > do { > > > if (XHC_REG_BIT_IS_SET (Xhc, Offset, Bit) == WaitToSet) { > > > - Status = EFI_SUCCESS; > > > - goto DONE; > > > + return EFI_SUCCESS; > > > } > > > > > > gBS->Stall (XHC_1_MICROSECOND); > > > - } while (EFI_ERROR (gBS->CheckEvent (TimeoutEvent))); > > > - > > > - Status = EFI_TIMEOUT; > > > + TimeDelta = XhcGetElapsedTime (&CurrentTick); > > > + // Ensure that ElapsedTime is always incremented to avoid > > > + indefinite > > > hangs > > > + if (TimeDelta == 0) { > > > + TimeDelta = XHC_MICROSECOND_TO_NANOSECOND > > > (XHC_1_MICROSECOND); > > > + } > > > > > > -DONE: > > > - if (TimeoutEvent != NULL) { > > > - gBS->CloseEvent (TimeoutEvent); > > > - } > > > + ElapsedTime += TimeDelta; > > > + } while (ElapsedTime < TimeoutTime); > > > > > > - return Status; > > > + return EFI_TIMEOUT; > > > } > > > > > > /** > > > diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c > > > b/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c > > > index 53421e64a8..7d4b7a769d 100644 > > > --- a/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c > > > +++ b/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c > > > @@ -2,6 +2,7 @@ > > > > > > XHCI transfer scheduling routines. > > > > > > +(C) Copyright 2023 Hewlett Packard Enterprise Development LP<BR> > > > Copyright (c) 2011 - 2020, Intel Corporation. All rights > > > reserved.<BR> Copyright (c) Microsoft Corporation.<BR> Copyright > > > (C) 2022 Advanced Micro Devices, Inc. All rights reserved.<BR> @@ - > 1276,15 +1277,14 @@ EXIT: > > > /** > > > Execute the transfer by polling the URB. This is a synchronous > > > operation. > > > > > > - @param Xhc The XHCI Instance. > > > - @param CmdTransfer The executed URB is for cmd transfer or > not. > > > - @param Urb The URB to execute. > > > - @param Timeout The time to wait before abort, in > > > millisecond. > > > + @param Xhc The XHCI Instance. > > > + @param CmdTransfer The executed URB is for cmd transfer or not. > > > + @param Urb The URB to execute. > > > + @param Timeout The time to wait before abort, in > > > millisecond. > > > > > > - @return EFI_DEVICE_ERROR The transfer failed due to transfer > > > error. > > > - @return EFI_TIMEOUT The transfer failed due to time out. > > > - @return EFI_SUCCESS The transfer finished OK. > > > - @retval EFI_OUT_OF_RESOURCES Memory for the timer event could > not > > > be allocated. > > > + @return EFI_DEVICE_ERROR The transfer failed due to transfer error. > > > + @return EFI_TIMEOUT The transfer failed due to time out. > > > + @return EFI_SUCCESS The transfer finished OK. > > > > > > **/ > > > EFI_STATUS > > > @@ -1299,12 +1299,14 @@ XhcExecTransfer ( > > > UINT8 SlotId; > > > UINT8 Dci; > > > BOOLEAN Finished; > > > - EFI_EVENT TimeoutEvent; > > > + UINT64 TimeoutTime; > > > + UINT64 ElapsedTime; > > > + UINT64 TimeDelta; > > > + UINT64 CurrentTick; > > > BOOLEAN IndefiniteTimeout; > > > > > > Status = EFI_SUCCESS; > > > Finished = FALSE; > > > - TimeoutEvent = NULL; > > > IndefiniteTimeout = FALSE; > > > > > > if (CmdTransfer) { > > > @@ -1322,34 +1324,14 @@ XhcExecTransfer ( > > > > > > if (Timeout == 0) { > > > IndefiniteTimeout = TRUE; > > > - goto RINGDOORBELL; > > > - } > > > - > > > - Status = gBS->CreateEvent ( > > > - EVT_TIMER, > > > - TPL_CALLBACK, > > > - NULL, > > > - NULL, > > > - &TimeoutEvent > > > - ); > > > - > > > - if (EFI_ERROR (Status)) { > > > - goto DONE; > > > } > > > > > > - Status = gBS->SetTimer ( > > > - TimeoutEvent, > > > - TimerRelative, > > > - EFI_TIMER_PERIOD_MILLISECONDS (Timeout) > > > - ); > > > - > > > - if (EFI_ERROR (Status)) { > > > - goto DONE; > > > - } > > > - > > > -RINGDOORBELL: > > > XhcRingDoorBell (Xhc, SlotId, Dci); > > > > > > + TimeoutTime = XHC_MICROSECOND_TO_NANOSECOND > ((UINT64)Timeout > > > * > > > + XHC_1_MILLISECOND); ElapsedTime = 0; CurrentTick = > > > + GetPerformanceCounter (); > > > + > > > do { > > > Finished = XhcCheckUrbResult (Xhc, Urb); > > > if (Finished) { > > > @@ -1357,22 +1339,22 @@ RINGDOORBELL: > > > } > > > > > > gBS->Stall (XHC_1_MICROSECOND); > > > - } while (IndefiniteTimeout || EFI_ERROR (gBS->CheckEvent > > > (TimeoutEvent))); > > > + TimeDelta = XhcGetElapsedTime (&CurrentTick); > > > + // Ensure that ElapsedTime is always incremented to avoid > > > + indefinite > > > hangs > > > + if (TimeDelta == 0) { > > > + TimeDelta = XHC_MICROSECOND_TO_NANOSECOND > > > (XHC_1_MICROSECOND); > > > + } > > > > > > -DONE: > > > - if (EFI_ERROR (Status)) { > > > - Urb->Result = EFI_USB_ERR_NOTEXECUTE; > > > - } else if (!Finished) { > > > + ElapsedTime += TimeDelta; > > > + } while (IndefiniteTimeout || ElapsedTime < TimeoutTime); > > > + > > > + if (!Finished) { > > > Urb->Result = EFI_USB_ERR_TIMEOUT; > > > Status = EFI_TIMEOUT; > > > } else if (Urb->Result != EFI_USB_NOERROR) { > > > Status = EFI_DEVICE_ERROR; > > > } > > > > > > - if (TimeoutEvent != NULL) { > > > - gBS->CloseEvent (TimeoutEvent); > > > - } > > > - > > > return Status; > > > } > > > > > > -- > > > 2.34.1 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. 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