From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mx.groups.io with SMTP id smtpd.web10.16679.1609780255463698611 for ; Mon, 04 Jan 2021 09:10:55 -0800 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: arm.com, ip: 217.140.110.172, mailfrom: ard.biesheuvel@arm.com) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C8952101E; Mon, 4 Jan 2021 09:10:53 -0800 (PST) Received: from [192.168.1.81] (unknown [10.37.8.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5552F3F66E; Mon, 4 Jan 2021 09:10:52 -0800 (PST) Subject: Re: [edk2-platforms][PATCH 1/1] Platform/RaspberryPi: Add system/user defined reset delay To: Samer El-Haj-Mahmoud , Pete Batard , "devel@edk2.groups.io" Cc: "leif@nuviainc.com" , "Andrei Warkentin (awarkentin@vmware.com)" References: <20201222134528.793-1-pete@akeo.ie> From: "Ard Biesheuvel" Autocrypt: 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K2pHRU9rUjN4ck80Qy9OK1hPRGVKRmlQClNCalpOR1VEL2tEdFBPTDNjUVR4dFhOV0JXT2hv Vjh5SE1abTlhWTNSNE9oR1BDNU5vZ0V1Q3JZeFN3UXZYZ0IKdHptQmxTZlc5UGtiWTZvY3dO UVRDdk5URjU4NUd1YlJvWFNwWDV1ODZZeUEySjRlSjBhUHhjSUJpcnBTWDQ0MQpUSzZtOEgx d0Zxaz0KPXpEZFAKLS0tLS1FTkQgUEdQIFBVQkxJQyBLRVkgQkxPQ0stLS0tLQo= Message-ID: <771a4208-3397-0a0d-7e37-f028aa92e349@arm.com> Date: Mon, 4 Jan 2021 18:10:50 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 12/25/20 7:10 PM, Samer El-Haj-Mahmoud wrote: > I tested the patch using the procedure documented in https://github.com= /pftf/RPi4/issues/95 (which is relatively easy to reproduce), and did not= se the async exception/hang with SD card. The SCT Runtime Variables test= complete without any hangs. It looks like this may be a sufficient worka= round for that issue. >=20 > Tested-By: Samer El-Haj-Mahmoud >=20 >=20 Pushed as a34e27a1fa79..94e9fba43d7e Thanks all! >> -----Original Message----- >> From: Pete Batard >> Sent: Tuesday, December 22, 2020 8:45 AM >> To: devel@edk2.groups.io >> Cc: Ard Biesheuvel ; leif@nuviainc.com; Samer >> El-Haj-Mahmoud ; Andrei Warkentin >> (awarkentin@vmware.com) >> Subject: [edk2-platforms][PATCH 1/1] Platform/RaspberryPi: Add >> system/user defined reset delay >> >> Due to the method in which NV variables are stored on removable media >> for the Raspberry Pi platform, and the manner in which we dump updated >> variables right before reset, it is possible, and has been repeatedly >> demonstrated with SSD-based USB 3.0 devices, that the updated file doe= s >> not actually end up being written to permanent storage, due to the >> device write-cache not having enough time to be flushed before reset. >> >> To compensate for this, since we don't know of a generic method that >> would allow turning off USB mass storage devices write cache (and also >> because we are seeing an issue that seems related for SD-based media), >> we add a new reset delay PCD, which can be set by the user, and which >> we also set as required when NV variables are being dumped. >> >> Our testing show that, with more than 3 seconds of extra delay, the >> storage media has enough time to finalize its internal write, thus >> solving the issue of configuration changes not being persisted. >> >> Signed-off-by: Pete Batard >> --- >> Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.c = | >> 24 ++++++++++++++++++++ >> Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.in= f | >> 1 + >> Platform/RaspberryPi/Library/ResetLib/ResetLib.c = | 11 >> +++++++++ >> Platform/RaspberryPi/Library/ResetLib/ResetLib.inf = | 5 ++++ >> Platform/RaspberryPi/RPi3/RPi3.dsc = | 6 +++++ >> Platform/RaspberryPi/RPi4/RPi4.dsc = | 6 +++++ >> Platform/RaspberryPi/RaspberryPi.dec = | 1 + >> 7 files changed, 54 insertions(+) >> >> diff --git >> a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.c >> b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.c >> index 07f3f1c24295..4071a3fca468 100644 >> --- >> a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.c >> +++ >> b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.c >> @@ -10,6 +10,18 @@ >> >> >> #include "VarBlockService.h" >> >> >> >> +// >> >> +// Minimum delay to enact before reset, when variables are dirty (in = =CE=BCs). >> >> +// Needed to ensure that SSD-based USB 3.0 devices have time to flush >> their >> >> +// write cache after updating the NV vars. A much smaller delay is ap= plied >> >> +// on Pi 3 compared to Pi 4, as we haven't had reports of issues ther= e yet. >> >> +// >> >> +#if (RPI_MODEL =3D=3D 3) >> >> +#define PLATFORM_RESET_DELAY 500000 >> >> +#else >> >> +#define PLATFORM_RESET_DELAY 3500000 >> >> +#endif >> >> + >> >> VOID *mSFSRegistration; >> >> >> >> >> >> @@ -154,6 +166,7 @@ DumpVars ( >> ) >> >> { >> >> EFI_STATUS Status; >> >> + RETURN_STATUS PcdStatus; >> >> >> >> if (mFvInstance->Device =3D=3D NULL) { >> >> DEBUG ((DEBUG_INFO, "Variable store not found?\n")); >> >> @@ -173,6 +186,17 @@ DumpVars ( >> } >> >> >> >> DEBUG ((DEBUG_INFO, "Variables dumped!\n")); >> >> + >> >> + // >> >> + // Add a reset delay to give time for slow/cached devices >> >> + // to flush the NV variables write to permanent storage. >> >> + // But only do so if this won't reduce an existing user-set delay. >> >> + // >> >> + if (PcdGet32 (PcdPlatformResetDelay) < PLATFORM_RESET_DELAY) { >> >> + PcdStatus =3D PcdSet32S (PcdPlatformResetDelay, >> PLATFORM_RESET_DELAY); >> >> + ASSERT_RETURN_ERROR (PcdStatus); >> >> + } >> >> + >> >> mFvInstance->Dirty =3D FALSE; >> >> } >> >> >> >> diff --git >> a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.i= nf >> b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.i= nf >> index ecfb8f85c9c1..c2edb25bd41d 100644 >> --- >> a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.i= nf >> +++ >> b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockServiceDxe.i= nf >> @@ -79,6 +79,7 @@ [Pcd] >> gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase >> >> gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase >> >> gRaspberryPiTokenSpaceGuid.PcdNvStorageEventLogBase >> >> + gRaspberryPiTokenSpaceGuid.PcdPlatformResetDelay >> >> gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64 >> >> >> >> [FeaturePcd] >> >> diff --git a/Platform/RaspberryPi/Library/ResetLib/ResetLib.c >> b/Platform/RaspberryPi/Library/ResetLib/ResetLib.c >> index c62a92321ecb..4a50166dd63b 100644 >> --- a/Platform/RaspberryPi/Library/ResetLib/ResetLib.c >> +++ b/Platform/RaspberryPi/Library/ResetLib/ResetLib.c >> @@ -16,6 +16,7 @@ >> >> >> #include >> >> #include >> >> +#include >> >> #include >> >> #include >> >> #include >> >> @@ -44,6 +45,7 @@ LibResetSystem ( >> ) >> >> { >> >> ARM_SMC_ARGS ArmSmcArgs; >> >> + UINT32 Delay; >> >> >> >> if (!EfiAtRuntime ()) { >> >> /* >> >> @@ -52,6 +54,15 @@ LibResetSystem ( >> EfiEventGroupSignal (&gRaspberryPiEventResetGuid); >> >> } >> >> >> >> + Delay =3D PcdGet32 (PcdPlatformResetDelay); >> >> + if (Delay !=3D 0) { >> >> + DEBUG ((DEBUG_INFO, "Platform will be reset in %d.%d seconds...\n= ", >> >> + Delay / 1000000, (Delay % 1000000) / 100000)); >> >> + MicroSecondDelay (Delay); >> >> + } >> >> + DEBUG ((DEBUG_INFO, "Platform %a.\n", >> >> + (ResetType =3D=3D EfiResetShutdown) ? "shutdown" : "reset")= ); >> >> + >> >> switch (ResetType) { >> >> case EfiResetPlatformSpecific: >> >> // Map the platform specific reset as reboot >> >> diff --git a/Platform/RaspberryPi/Library/ResetLib/ResetLib.inf >> b/Platform/RaspberryPi/Library/ResetLib/ResetLib.inf >> index b02a06d9d0bf..9bdb94a52ebf 100644 >> --- a/Platform/RaspberryPi/Library/ResetLib/ResetLib.inf >> +++ b/Platform/RaspberryPi/Library/ResetLib/ResetLib.inf >> @@ -33,8 +33,13 @@ [LibraryClasses] >> DebugLib >> >> BaseLib >> >> ArmSmcLib >> >> + PcdLib >> >> + TimerLib >> >> UefiLib >> >> UefiRuntimeLib >> >> >> >> [Guids] >> >> gRaspberryPiEventResetGuid >> >> + >> >> +[Pcd] >> >> + gRaspberryPiTokenSpaceGuid.PcdPlatformResetDelay ## CONSUMES >> >> diff --git a/Platform/RaspberryPi/RPi3/RPi3.dsc >> b/Platform/RaspberryPi/RPi3/RPi3.dsc >> index 9408138d0a09..530b42796a0d 100644 >> --- a/Platform/RaspberryPi/RPi3/RPi3.dsc >> +++ b/Platform/RaspberryPi/RPi3/RPi3.dsc >> @@ -508,6 +508,12 @@ [PcdsDynamicHii.common.DEFAULT] >> >> gRaspberryPiTokenSpaceGuid.PcdFanOnGpio|L"FanOnGpio"|gConfigDxeFor >> mSetGuid|0x0|0 >> >> >> gRaspberryPiTokenSpaceGuid.PcdFanTemp|L"FanTemp"|gConfigDxeFormS >> etGuid|0x0|0 >> >> >> >> + # >> >> + # Reset-related. >> >> + # >> >> + >> >> + >> gRaspberryPiTokenSpaceGuid.PcdPlatformResetDelay|L"ResetDelay"|gRasp >> berryPiTokenSpaceGuid|0x0|0 >> >> + >> >> # >> >> # Common UEFI ones. >> >> # >> >> diff --git a/Platform/RaspberryPi/RPi4/RPi4.dsc >> b/Platform/RaspberryPi/RPi4/RPi4.dsc >> index ddf4dd6a416e..5f8452aa0b76 100644 >> --- a/Platform/RaspberryPi/RPi4/RPi4.dsc >> +++ b/Platform/RaspberryPi/RPi4/RPi4.dsc >> @@ -522,6 +522,12 @@ [PcdsDynamicHii.common.DEFAULT] >> >> gRaspberryPiTokenSpaceGuid.PcdFanOnGpio|L"FanOnGpio"|gConfigDxeFor >> mSetGuid|0x0|0 >> >> >> gRaspberryPiTokenSpaceGuid.PcdFanTemp|L"FanTemp"|gConfigDxeFormS >> etGuid|0x0|60 >> >> >> >> + # >> >> + # Reset-related. >> >> + # >> >> + >> >> + >> gRaspberryPiTokenSpaceGuid.PcdPlatformResetDelay|L"ResetDelay"|gRasp >> berryPiTokenSpaceGuid|0x0|0 >> >> + >> >> # >> >> # Common UEFI ones. >> >> # >> >> diff --git a/Platform/RaspberryPi/RaspberryPi.dec >> b/Platform/RaspberryPi/RaspberryPi.dec >> index c64c61930ea8..10723036aa31 100644 >> --- a/Platform/RaspberryPi/RaspberryPi.dec >> +++ b/Platform/RaspberryPi/RaspberryPi.dec >> @@ -68,3 +68,4 @@ [PcdsFixedAtBuild, PcdsPatchableInModule, >> PcdsDynamic, PcdsDynamicEx] >> gRaspberryPiTokenSpaceGuid.PcdRamLimitTo3GB|0|UINT32|0x0000001A >> >> gRaspberryPiTokenSpaceGuid.PcdFanOnGpio|0|UINT32|0x0000001C >> >> gRaspberryPiTokenSpaceGuid.PcdFanTemp|0|UINT32|0x0000001D >> >> + >> gRaspberryPiTokenSpaceGuid.PcdPlatformResetDelay|0|UINT32|0x0000001 >> E >> >> -- >> 2.29.2.windows.2 >=20