From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by spool.mail.gandi.net (Postfix) with ESMTPS id A8499940EF7 for ; Tue, 10 Oct 2023 00:21:40 +0000 (UTC) DKIM-Signature: a=rsa-sha256; bh=+7KxAQuP9erIUlwb7gyBeb0c9HteME+i5C2RbS79oqw=; c=relaxed/simple; d=groups.io; h=Message-ID:Date:MIME-Version:User-Agent:Subject:To:Cc:References:From:In-Reply-To:Precedence:List-Subscribe:List-Help:Sender:List-Id:Mailing-List:Delivered-To:Reply-To:List-Unsubscribe-Post:List-Unsubscribe:Content-Type:Content-Language; s=20140610; t=1696897299; v=1; b=BW0ymTRCMUxab3vFSPOWBzjE1zxj4ggqmppwksIJbmUTLjCI61oRw7vZrvoZBHyW6KslK8f2 YnvmH0WF+Wm5YijNC10JoakKEwM7u1n2zGUBDmPlf02YWF95AZ3k/RfC4PYVuYNKIRGN3tZ+3Px DmB1sEyhH72Poc5EF8Yt1phg= X-Received: by 127.0.0.2 with SMTP id 8gcNYY7687511xTI297fMKfD; Mon, 09 Oct 2023 17:21:39 -0700 X-Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) by mx.groups.io with SMTP id smtpd.web10.80072.1696897298636915195 for ; Mon, 09 Oct 2023 17:21:38 -0700 X-Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-1c60f1a2652so37769495ad.0 for ; Mon, 09 Oct 2023 17:21:38 -0700 (PDT) X-Gm-Message-State: jc8MEZhlZWZ7g5BwLU9LNUFzx7686176AA= X-Google-Smtp-Source: AGHT+IFl5Mf7IbTimPWvzS8jJvBo/DiZzCehie+owkkH2xX5Or+afVhy1mOrzWPXA8dAk5RSc2TxeA== X-Received: by 2002:a17:902:dac6:b0:1c7:24fa:64c7 with SMTP id q6-20020a170902dac600b001c724fa64c7mr23900662plx.26.1696897297498; Mon, 09 Oct 2023 17:21:37 -0700 (PDT) X-Received: from ?IPV6:2001:4898:d8:33:2cee:fa50:c6ca:fefc? ([2001:4898:80e8:3:ad0d:fa50:c6ca:fefc]) by smtp.gmail.com with ESMTPSA id q7-20020a170902a3c700b001c9b3d285fasm62819plb.143.2023.10.09.17.21.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Oct 2023 17:21:36 -0700 (PDT) Message-ID: <15fe8a75-26ac-4507-ae64-5f08c2641cd0@gmail.com> Date: Mon, 9 Oct 2023 17:21:35 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: =?UTF-8?B?UmU6IOWbnuWkjTog5Zue5aSNOiBbZWRrMi1kZXZlbF0g5Zue5aSNOiBbUEFUQ0ggdjEgMy80XSBNZGVNb2R1bGVQa2c6IFBlaU1haW46IEludHJvZHVjZSBpbXBsZW1lbnRhdGlvbiBvZiBkZWxheWVkIGRpc3BhdGNo?= To: devel@edk2.groups.io, gaoliming@byosoft.com.cn Cc: 'Jian J Wang' , 'Dandan Bi' , 'Debkumar De' , 'Catharine West' , 'Mike Turner' References: <20230720210729.774-1-kuqin12@gmail.com> <20230720210729.774-4-kuqin12@gmail.com> <01b901d9be9e$21a964c0$64fc2e40$@byosoft.com.cn> <003c01d9c500$5dcf2a30$196d7e90$@byosoft.com.cn> <080201d9f8dd$09132210$1b396630$@byosoft.com.cn> From: "Kun Qin" In-Reply-To: <080201d9f8dd$09132210$1b396630$@byosoft.com.cn> Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,kuqin12@gmail.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: Content-Type: multipart/alternative; boundary="------------QdkAFi9dpbV0e6vDgKiO88nZ" Content-Language: en-US X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=BW0ymTRC; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io --------------QdkAFi9dpbV0e6vDgKiO88nZ Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Liming, I updated this patch to use macro definition and incorporated other changes as you suggested in v2. Could you please review when you have a chance? Any input is appreciated. Regards, Kun On 10/6/2023 10:13 PM, gaoliming via groups.io wrote: > > Kun: > >  For this usage, this PCD is not required. We can update the code > logic to avoid new PCD. You can set the default PPI number for current > usage. If so, PPI number will not be increased. > > Thanks > > Liming > > *发件人:*devel@edk2.groups.io *代表 *Kun Qin > *发送时间:*2023年10月4日22:54 > *收件人:*devel@edk2.groups.io; gaoliming@byosoft.com.cn > *抄送:*'Jian J Wang' ; 'Dandan Bi' > ; 'Debkumar De' ; > 'Catharine West' ; 'Mike Turner' > > *主题:*Re: 回复: [edk2-devel] 回复: [PATCH v1 3/4] MdeModulePkg: PeiMain: > Introduce implementation of delayed dispatch > > Hi Liming, > > Sorry for the delayed response on this patch. I went on leave while > collecting opinions regarding your feedback. > > The concern we have for increasing the entry number during boot time > is that this PPI is designed to be available at pre-mem phase. The > practical usage would be a small number of platforms just needing an > additional one or two slots, which we think this is ideal for a build > time PCD. Could you please let us know how you think? > > Thanks, > Kun > > On 8/1/2023 10:15 PM, gaoliming via groups.io wrote: > > Kun: > > PcdDelayedDispatchMaxEntries is not required. The required Entry > number can be increased at boot time. You can see MaxFvCount in > PrivateData that is increased by FV_GROWTH_STEP > > Thanks > > Liming > > *发件人:*devel@edk2.groups.io > *代表 *Kun Qin > *发送时间:*2023年8月1日12:16 > *收件人:*devel@edk2.groups.io; gaoliming@byosoft.com.cn > *抄送:*'Jian J Wang' > ; 'Dandan Bi' > ; 'Debkumar De' > ; 'Catharine > West' > ; 'Mike Turner' > > *主题:*Re: [edk2-devel] 回复: [PATCH v1 3/4] MdeModulePkg: PeiMain: > Introduce implementation of delayed dispatch > > Hi Liming, > > Thanks for the feedback. > > Per your feedback (I suggest to define MACRO in PeiCore for them. > If there is real usage model, new PCD can be introduced later.) on > the following new PCDs: > > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeoutUs > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxEntries > > Given this feature has been used internally at Project MU for a > while, I > collected some feedback from the consumer platforms: > > - Delayed dispatch is a feature that can be used for power up > sequence, and > thus the value of maximum entries in this case can depend on the > number of PCI > devices on the platform, and thus hardcoding the value as a macro > definition will > limit the usage and we might come to update it very soon. > > - There is already usage on our platforms that would override the > timeout PCDs > to based on the firmware builds. For example, on a test build, we > might register extra > entries to the PPI and thus extend the completion timeout. > > I agree with your comments on other fronts. Please let me know if > you have further > concerns regarding the PCDs above. I can send out an updated > version after your input > on those. > > Thanks, > Kun > > On 7/24/2023 7:17 PM, gaoliming via groups.io wrote: > > Kun: > >   I add my comments below. > > -----邮件原件----- > > 发件人: Kun Qin > > 发送时间: 2023年7月21日5:07 > > 收件人: devel@edk2.groups.io > > 抄送: Jian J Wang > ; Dandan Bi > > ; Liming > Gao > ; > > Debkumar De > ; Catharine West > > > ; Mike Turner > > > 主题: [PATCH v1 3/4] MdeModulePkg: PeiMain: Introduce > implementation of > > delayed dispatch > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4496 > > This change adds the implementation that fits the needs > and description > > of PI spec defined Delayed Dispatch PPI in Pei Core. > > The PPI would allow minimal delay for registered > callbacks. As well as > > allowing other functions to wait for GUIDed delayed > dispatch callbacks. > > Cc: Jian J Wang > > > Cc: Dandan Bi > > > Cc: Liming Gao > > > Cc: Debkumar De > > > Cc: Catharine West > > > Co-authored-by: Mike Turner > > > Signed-off-by: Kun Qin > > > --- > > MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c | 353 > > ++++++++++++++++++++ > > MdeModulePkg/Core/Pei/PeiMain/PeiMain.c       |   3 + > > MdeModulePkg/Core/Pei/PeiMain.h               |  76 +++++ > > MdeModulePkg/Core/Pei/PeiMain.inf             |   7 + > > MdeModulePkg/MdeModulePkg.dec                 |  15 + > > 5 files changed, 454 insertions(+) > > diff --git a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c > > b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c > > index 5f32ebb560ae..50e59bdbe732 100644 > > --- a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c > > +++ b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c > > @@ -3,12 +3,339 @@ > > Copyright (c) 2006 - 2019, Intel Corporation. All rights > reserved.
> > (C) Copyright 2016 Hewlett Packard Enterprise Development > LP
> > +Copyright (c) Microsoft Corporation. > > SPDX-License-Identifier: BSD-2-Clause-Patent > > **/ > > #include "PeiMain.h" > > +/** > > +  DelayedDispatchDispatcher > > + > > +  ayed Dispach cycle (ie one pass) through each entry, > calling functions > > when their > > +  e has expired.  When UniqueId is specified, if there > are any of the > > specified entries > > +  the dispatch queue during dispatch, repeat the > DelayedDispatch cycle. > > + > > [Liming] Above comments are incomplete. Please update. > > +  @param DelayedDispatchTable  Pointer to dispatch table > > +  @param OPTIONAL              UniqueId used to insure > particular > > time is met. > > + > > +  @return BOOLEAN > > +**/ > > +BOOLEAN > > +DelayedDispatchDispatcher ( > > +  IN DELAYED_DISPATCH_TABLE  *DelayedDispatchTable, > > +  IN EFI_GUID                *UniqueId           OPTIONAL > > +  ); > > + > > +/** > > +  DelayedDispatch End of PEI callback function. Insure > that all of the > > delayed dispatch > > +  entries are complete before exiting PEI. > > + > > +  @param[in] PeiServices   - Pointer to PEI Services Table. > > +  @param[in] NotifyDesc    - Pointer to the descriptor > for the > > Notification > > event that > > +                             caused this function to execute. > > +  @param[in] Ppi           - Pointer to the PPI data > associated with this > > function. > > + > > +  @retval EFI_STATUS       - Always return EFI_SUCCESS > > +**/ > > +EFI_STATUS > > +EFIAPI > > +PeiDelayedDispatchOnEndOfPei ( > > +  IN EFI_PEI_SERVICES           **PeiServices, > > +  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc, > > +  IN VOID                       *Ppi > > +  ); > > + > > +EFI_DELAYED_DISPATCH_PPI  mDelayedDispatchPpi  = > > { PeiDelayedDispatchRegister, > PeiDelayedDispatchWaitOnUniqueId }; > > +EFI_PEI_PPI_DESCRIPTOR    mDelayedDispatchDesc = { > > +  (EFI_PEI_PPI_DESCRIPTOR_PPI | > > EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST), > > +  &gEfiPeiDelayedDispatchPpiGuid, > > +  &mDelayedDispatchPpi > > +}; > > + > > +EFI_PEI_NOTIFY_DESCRIPTOR  mDelayedDispatchNotifyDesc = { > > +  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | > > EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST, > > +  &gEfiEndOfPeiSignalPpiGuid, > > +  PeiDelayedDispatchOnEndOfPei > > +}; > > + > > +/** > > +  Helper function to look up DELAYED_DISPATCH_TABLE > published in HOB. > > + > > +  @return Pointer to DELAYED_DISPATCH_TABLE from HOB > > +**/ > > +DELAYED_DISPATCH_TABLE * > > +GetDelayedDispatchTable ( > > +  VOID > > +  ) > > +{ > > +  EFI_HOB_GUID_TYPE  *GuidHob; > > + > > +  GuidHob = GetFirstGuidHob (&gEfiDelayedDispatchTableGuid); > > +  if (NULL == GuidHob) { > > +    DEBUG ((DEBUG_ERROR, "Delayed Dispatch PPI ERROR - > Delayed > > Dispatch Hob not available.\n")); > > +    ASSERT (FALSE); > > +    return NULL; > > +  } > > + > > +  return (DELAYED_DISPATCH_TABLE *)GET_GUID_HOB_DATA > (GuidHob); > > +} > > + > > +/** > > +Register a callback to be called after a minimum delay > has occurred. > > + > > +This service is the single member function of the > > EFI_DELAYED_DISPATCH_PPI > > + > > +  @param[in] This           Pointer to the > EFI_DELAYED_DISPATCH_PPI > > instance > > +  @param[in] Function       Function to call back > > +  @param[in] Context        Context data > > +  @param[in] UniqueId       GUID for this Delayed > Dispatch request. > > +  @param[in] Delay          Delay interval > > + > > +  @retval EFI_SUCCESS               Function successfully > loaded > > +  @retval EFI_INVALID_PARAMETER     One of the Arguments > is not > > supported > > +  @retval EFI_OUT_OF_RESOURCES      No more entries > > + > > +**/ > > +EFI_STATUS > > +EFIAPI > > +PeiDelayedDispatchRegister ( > > +  IN  EFI_DELAYED_DISPATCH_PPI       *This, > > +  IN  EFI_DELAYED_DISPATCH_FUNCTION  Function, > > +  IN  UINT64                         Context, > > +  IN  EFI_GUID                       *UniqueId   OPTIONAL, > > +  IN  UINT32                         Delay > > +  ) > > +{ > > +  DELAYED_DISPATCH_TABLE  *DelayedDispatchTable; > > +  DELAYED_DISPATCH_ENTRY  *Entry; > > + > > +  // Check input parameters > > +  if ((NULL == Function) || (Delay > FixedPcdGet32 > > (PcdDelayedDispatchMaxDelayUs)) || (NULL == This)) { > > +    DEBUG ((DEBUG_ERROR, "%a Invalid parameter\n", > __func__)); > > +    return EFI_INVALID_PARAMETER; > > +  } > > + > > +  // Get delayed dispatch table > > +  DelayedDispatchTable = GetDelayedDispatchTable (); > > +  if (NULL == DelayedDispatchTable) { > > +    DEBUG ((DEBUG_ERROR, "%a Unable to locate dispatch > table\n", > > __func__)); > > +    return EFI_UNSUPPORTED; > > +  } > > + > > +  // Check for available entry slots > > +  if (DelayedDispatchTable->Count >= FixedPcdGet32 > > (PcdDelayedDispatchMaxEntries)) { > > +    ASSERT (DelayedDispatchTable->Count < FixedPcdGet32 > > (PcdDelayedDispatchMaxEntries)); > > +    DEBUG ((DEBUG_ERROR, "%a Too many entries requested\n", > > __func__)); > > +    return EFI_OUT_OF_RESOURCES; > > +  } > > + > > +  Entry               = > > &(DelayedDispatchTable->Entry[DelayedDispatchTable->Count]); > > +  Entry->Function     = Function; > > +  Entry->Context      = Context; > > +  Entry->DispatchTime = GET_TIME_IN_US () + Delay; > > +  if (NULL != UniqueId) { > > +    CopyGuid (&Entry->UniqueId, UniqueId); > > +  } else { > > +    ZeroMem (&Entry->UniqueId, sizeof (EFI_GUID)); > > +  } > > + > > +  Entry->MicrosecondDelay = Delay; > > +  DelayedDispatchTable->Count++; > > + > > +  DEBUG ((DEBUG_INFO, "%a  Adding dispatch Entry\n", > __func__)); > > +  DEBUG ((DEBUG_INFO, "    Requested Delay = %d\n", Delay)); > > +  DEBUG ((DEBUG_INFO, "    Trigger Time = %d\n", > > Entry->DispatchTime)); > > +  DEBUG ((DEBUG_INFO, "    Context = 0x%08lx\n", > Entry->Context)); > > +  DEBUG ((DEBUG_INFO, "    Function = %p\n", > Entry->Function)); > > +  DEBUG ((DEBUG_INFO, "    GuidHandle = %g\n", > &(Entry->UniqueId))); > > + > > +  if (0 == Delay) { > > +    // Force early dispatch point > > +    DelayedDispatchDispatcher (DelayedDispatchTable, NULL); > > +  } > > + > > +  return EFI_SUCCESS; > > +} > > + > > +/** > > +  DelayedDispatchDispatcher > > + > > +  ayed Dispach cycle (ie one pass) through each entry, > calling functions > > when their > > +  e has expired.  When UniqueId is specified, if there > are any of the > > specified entries > > +  the dispatch queue during dispatch, repeat the > DelayedDispatch cycle. > > + > > +  @param DelayedDispatchTable  Pointer to dispatch table > > +  @param OPTIONAL              UniqueId used to insure > particular > > time is met. > > + > > +  @return BOOLEAN > > +**/ > > +BOOLEAN > > +DelayedDispatchDispatcher ( > > +  IN DELAYED_DISPATCH_TABLE  *DelayedDispatchTable, > > +  IN EFI_GUID                *UniqueId           OPTIONAL > > +  ) > > +{ > > +  BOOLEAN                 Dispatched; > > +  UINT32                  TimeCurrent; > > +  UINT32                  MaxDispatchTime; > > +  UINTN                   Index1; > > +  BOOLEAN                 UniqueIdPresent; > > +  DELAYED_DISPATCH_ENTRY  *Entry; > > + > > +  Dispatched      = FALSE; > > +  UniqueIdPresent = TRUE; > > +  MaxDispatchTime = GET_TIME_IN_US () + FixedPcdGet32 > > (PcdDelayedDispatchCompletionTimeoutUs); > > +  while ((DelayedDispatchTable->Count > 0) && > (UniqueIdPresent)) { > > +    UniqueIdPresent = FALSE; > > +    DelayedDispatchTable->DispCount++; > > + > > +    // If dispatching is messed up, clear > DelayedDispatchTable and exit. > > +    TimeCurrent =  GET_TIME_IN_US (); > > +    if (TimeCurrent > MaxDispatchTime) { > > +      DEBUG ((DEBUG_ERROR, "%a - DelayedDispatch Completion > > timeout!\n", __func__)); > > +      ReportStatusCode ((EFI_ERROR_MAJOR | EFI_ERROR_CODE), > > (EFI_SOFTWARE_PEI_CORE | EFI_SW_EC_ABORTED)); > > +      ASSERT (FALSE); > > +      DelayedDispatchTable->Count = 0; > > +      break; > > +    } > > + > > +    // Check each entry in the table for possible dispatch > > +    for (Index1 = 0; Index1 < DelayedDispatchTable->Count;) { > > +      Entry = &(DelayedDispatchTable->Entry[Index1]); > > +      // If UniqueId is present, insure there is an > additional check of > > the > > table. > > +      if (NULL != UniqueId) { > > +        if (CompareGuid (UniqueId, &Entry->UniqueId)) { > > +          UniqueIdPresent = TRUE; > > +        } > > +      } > > + > > +      TimeCurrent =  GET_TIME_IN_US (); > > +      if (TimeCurrent >= Entry->DispatchTime) { > > +        // Time expired, invoked the function > > +        DEBUG (( > > +          DEBUG_ERROR, > > +          "Delayed dispatch entry %d @ %p, Target=%d, Act=%d > > Disp=%d\n", > > +          Index1, > > +          Entry->Function, > > +          Entry->DispatchTime, > > +          TimeCurrent, > > +          DelayedDispatchTable->DispCount > > +          )); > > +        Dispatched              = TRUE; > > +        Entry->MicrosecondDelay = 0; > > +        Entry->Function ( > > +                 &Entry->Context, > > +                 &Entry->MicrosecondDelay > > +                 ); > > +        DEBUG ((DEBUG_ERROR, "Delayed dispatch Function > returned > > delay=%d\n", Entry->MicrosecondDelay)); > > +        if (0 == Entry->MicrosecondDelay) { > > +          // NewTime = 0 = delete this entry from the table > > +          DelayedDispatchTable->Count--; > > +          CopyMem (Entry, Entry+1, sizeof > (DELAYED_DISPATCH_ENTRY) > > * (DelayedDispatchTable->Count - Index1)); > > +        } else { > > +          if (Entry->MicrosecondDelay > FixedPcdGet32 > > (PcdDelayedDispatchMaxDelayUs)) { > > +            DEBUG ((DEBUG_ERROR, "%a Illegal new delay %d > > requested\n", __func__, Entry->MicrosecondDelay)); > > +            ASSERT (FALSE); > > +            Entry->MicrosecondDelay = FixedPcdGet32 > > (PcdDelayedDispatchMaxDelayUs); > > +          } > > + > > +          // NewTime != 0 - update the time from us to > Dispatch time > > +          Entry->DispatchTime =  GET_TIME_IN_US () + > > Entry->MicrosecondDelay; > > +          Index1++; > > +        } > > +      } else { > > +        Index1++; > > +      } > > +    } > > +  } > > + > > +  return Dispatched; > > +} > > + > > +/** > > +  Wait on a registered Delayed Dispatch unit that has a > UniqueId. > > Continue > > +  to dispatch all registered delayed dispatch entries > until *ALL* entries > > with > > +  UniqueId have completed. > > + > > +  @param[in]     This            The Delayed Dispatch PPI > pointer. > > +  @param[in]     UniqueId        UniqueId of delayed > dispatch entry. > > + > > +  @retval EFI_SUCCESS            The operation succeeds. > > +  @retval EFI_INVALID_PARAMETER  The parameters are invalid. > > + > > +**/ > > +EFI_STATUS > > +EFIAPI > > +PeiDelayedDispatchWaitOnUniqueId ( > > +  IN EFI_DELAYED_DISPATCH_PPI  *This, > > +  IN EFI_GUID                  *UniqueId > > +  ) > > +{ > > +  PERF_FUNCTION_BEGIN (); > > +  DELAYED_DISPATCH_TABLE  *DelayedDispatchTable; > > + > > +  // Get delayed dispatch table > > +  DelayedDispatchTable = GetDelayedDispatchTable (); > > +  if (NULL == DelayedDispatchTable) { > > +    PERF_FUNCTION_END (); > > +    return EFI_UNSUPPORTED; > > +  } > > + > > +  if ((NULL == UniqueId) || (IsZeroGuid (UniqueId))) { > > +    ASSERT (FALSE); > > +    PERF_FUNCTION_END (); > > +    return EFI_UNSUPPORTED; > > +  } > > + > > +  DEBUG ((DEBUG_INFO, "Delayed dispatch on %g. Count=%d, > > DispatchCount=%d\n", UniqueId, DelayedDispatchTable->Count, > > DelayedDispatchTable->DispCount)); > > +  PERF_EVENT_SIGNAL_BEGIN (UniqueId); > > +  DelayedDispatchDispatcher (DelayedDispatchTable, UniqueId); > > +  PERF_EVENT_SIGNAL_END (UniqueId); > > + > > +  PERF_FUNCTION_END (); > > +  return EFI_SUCCESS; > > +} > > + > > +/** > > +  DelayedDispatch End of PEI callback function. Insure > that all of the > > delayed dispatch > > +  entries are complete before exiting PEI. > > + > > +  @param[in] PeiServices   - Pointer to PEI Services Table. > > +  @param[in] NotifyDesc    - Pointer to the descriptor > for the > > Notification > > event that > > +                             caused this function to execute. > > +  @param[in] Ppi           - Pointer to the PPI data > associated with this > > function. > > + > > +  @retval EFI_STATUS       - Always return EFI_SUCCESS > > +**/ > > +EFI_STATUS > > +EFIAPI > > +PeiDelayedDispatchOnEndOfPei ( > > +  IN EFI_PEI_SERVICES           **PeiServices, > > +  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc, > > +  IN VOID                       *Ppi > > +  ) > > +{ > > +  DELAYED_DISPATCH_TABLE  *DelayedDispatchTable; > > + > > +  // Get delayed dispatch table > > +  DelayedDispatchTable = GetDelayedDispatchTable (); > > +  if (NULL == DelayedDispatchTable) { > > +    return EFI_UNSUPPORTED; > > +  } > > + > > +  PERF_INMODULE_BEGIN ("PerfDelayedDispatchEndOfPei"); > > +  while (DelayedDispatchTable->Count > 0) { > > +    DelayedDispatchDispatcher (DelayedDispatchTable, NULL); > > +  } > > + > > +  DEBUG ((DEBUG_ERROR, "%a Count of dispatch cycles is > %d\n", __func__, > > DelayedDispatchTable->DispCount)); > > +  PERF_INMODULE_END ("PerfDelayedDispatchEndOfPei"); > > + > > +  return EFI_SUCCESS; > > +} > > + > > /** > >    Discover all PEIMs and optional Apriori file in one FV. > There is at > > most one > > @@ -1365,12 +1692,31 @@ PeiDispatcher ( > >    EFI_PEI_FILE_HANDLE     SaveCurrentFileHandle; > >    EFI_FV_FILE_INFO        FvFileInfo; > >    PEI_CORE_FV_HANDLE      *CoreFvHandle; > > +  EFI_HOB_GUID_TYPE       *GuidHob; > > +  UINT32                  TableSize; > >    PeiServices    = (CONST EFI_PEI_SERVICES **)&Private->Ps; > >    PeimEntryPoint = NULL; > >    PeimFileHandle = NULL; > >    EntryPoint     = 0; > > +  if (NULL == Private->DelayedDispatchTable) { > > +    GuidHob = GetFirstGuidHob > (&gEfiDelayedDispatchTableGuid); > > +    if (NULL != GuidHob) { > > +      Private->DelayedDispatchTable = (DELAYED_DISPATCH_TABLE > > *)(GET_GUID_HOB_DATA (GuidHob)); > > +    } else { > > +      TableSize                     = sizeof > > (DELAYED_DISPATCH_TABLE) + ((FixedPcdGet32 > > (PcdDelayedDispatchMaxEntries) - 1) * sizeof > (DELAYED_DISPATCH_ENTRY)); > > +      Private->DelayedDispatchTable = BuildGuidHob > > (&gEfiDelayedDispatchTableGuid, TableSize); > > +      if (NULL != Private->DelayedDispatchTable) { > > +        ZeroMem (Private->DelayedDispatchTable, TableSize); > > +        Status = PeiServicesInstallPpi > (&mDelayedDispatchDesc); > > +        ASSERT_EFI_ERROR (Status); > > +        Status = PeiServicesNotifyPpi > (&mDelayedDispatchNotifyDesc); > > +        ASSERT_EFI_ERROR (Status); > > +      } > > +    } > > +  } > > + > >    if ((Private->PeiMemoryInstalled) && > >        (PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes) || > >         (Private->HobList.HandoffInformationTable->BootMode != > > BOOT_ON_S3_RESUME) || > > @@ -1621,6 +1967,13 @@ PeiDispatcher ( > >              } > >            } > >          } > > + > > +        // Dispatch pending delalyed dispatch requests > > +        if (NULL != Private->DelayedDispatchTable) { > > +          if (DelayedDispatchDispatcher > (Private->DelayedDispatchTable, > > NULL)) { > > +            ProcessDispatchNotifyList (Private); > > +          } > > +        } > >        } > >        // > > diff --git a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c > > b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c > > index bf1719d7941a..e5643adf7027 100644 > > --- a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c > > +++ b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c > > @@ -277,6 +277,9 @@ PeiCore ( > >          OldCoreData->TempFileHandles = (EFI_PEI_FILE_HANDLE > > *)((UINT8 *)OldCoreData->TempFileHandles - > OldCoreData->HeapOffset); > >        } > > +      // Force relocating the dispatch table > > +      OldCoreData->DelayedDispatchTable = NULL; > > + > >        // > >        // Fixup for PeiService's address > >        // > > diff --git a/MdeModulePkg/Core/Pei/PeiMain.h > > b/MdeModulePkg/Core/Pei/PeiMain.h > > index 556beddad533..3b8bbe7f25a1 100644 > > --- a/MdeModulePkg/Core/Pei/PeiMain.h > > +++ b/MdeModulePkg/Core/Pei/PeiMain.h > > @@ -11,6 +11,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent > > #include > > #include > > +#include > > +#include > > #include > > #include > > #include > > @@ -41,6 +43,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent > > #include > > #include > > #include > > +#include > > #include > > #include > > #include > > @@ -207,6 +210,29 @@ EFI_STATUS > > #define PEI_CORE_HANDLE_SIGNATURE  > SIGNATURE_32('P','e','i','C') > > +#define GET_TIME_IN_US() > > ((UINT32)DivU64x32(GetTimeInNanoSecond(GetPerformanceCounter > ()), > > 1000)) > > + > > +// > > +// Internal structure for delayed dispatch entries. > > +// > > +#pragma pack (push, 1) > > + > > +typedef struct { > > +  EFI_GUID                         UniqueId; > > +  UINT64                           Context; > > +  EFI_DELAYED_DISPATCH_FUNCTION    Function; > > +  UINT32                           DispatchTime; > > +  UINT32                           MicrosecondDelay; > > +} DELAYED_DISPATCH_ENTRY; > > + > > +typedef struct { > > +  UINT32                    Count; > > +  UINT32                    DispCount; > > +  DELAYED_DISPATCH_ENTRY    Entry[1];     // Actual size > based on > > PCD PcdDelayedDispatchMaxEntries; > > +} DELAYED_DISPATCH_TABLE; > > + > > +#pragma pack (pop) > > + > > /// > > /// Pei Core private data structure instance > > /// > > @@ -307,6 +333,11 @@ struct _PEI_CORE_INSTANCE { > >    // Those Memory Range will be migrated into physical > memory. > >    // > >    HOLE_MEMORY_DATA > > HoleData[HOLE_MAX_NUMBER]; > > + > > +  // > > +  // Table of delayed dispatch requests > > +  // > > +  DELAYED_DISPATCH_TABLE            *DelayedDispatchTable; > > }; > > /// > > @@ -2038,4 +2069,49 @@ PeiReinitializeFv ( > >    IN  PEI_CORE_INSTANCE  *PrivateData > >    ); > > +/** > > +Register a callback to be called after a minimum delay > has occurred. > > + > > +This service is the single member function of the > > EFI_DELAYED_DISPATCH_PPI > > + > > +  @param[in] This           Pointer to the > EFI_DELAYED_DISPATCH_PPI > > instance > > +  @param[in] Function       Function to call back > > +  @param[in] Context        Context data > > +  @param[in] UniqueId       GUID for this Delayed > Dispatch request. > > +  @param[in] Delay          Delay interval > > + > > +  @retval EFI_SUCCESS               Function successfully > loaded > > +  @retval EFI_INVALID_PARAMETER     One of the Arguments > is not > > supported > > +  @retval EFI_OUT_OF_RESOURCES      No more entries > > + > > +**/ > > +EFI_STATUS > > +EFIAPI > > +PeiDelayedDispatchRegister ( > > +  IN  EFI_DELAYED_DISPATCH_PPI       *This, > > +  IN  EFI_DELAYED_DISPATCH_FUNCTION  Function, > > +  IN  UINT64                         Context, > > +  IN  EFI_GUID                       *UniqueId   OPTIONAL, > > +  IN  UINT32                         Delay > > +  ); > > + > > +/** > > +  Wait on a registered Delayed Dispatch unit that has a > UniqueId. > > Continue > > +  to dispatch all registered delayed dispatch entries > until *ALL* entries > > with > > +  UniqueId have completed. > > + > > +  @param[in]     This            The Delayed Dispatch PPI > pointer. > > +  @param[in]     UniqueId        UniqueId of delayed > dispatch entry. > > + > > +  @retval EFI_SUCCESS            The operation succeeds. > > +  @retval EFI_INVALID_PARAMETER  The parameters are invalid. > > + > > +**/ > > +EFI_STATUS > > +EFIAPI > > +PeiDelayedDispatchWaitOnUniqueId ( > > +  IN EFI_DELAYED_DISPATCH_PPI  *This, > > +  IN EFI_GUID                  *UniqueId > > +  ); > > + > > #endif > > diff --git a/MdeModulePkg/Core/Pei/PeiMain.inf > > b/MdeModulePkg/Core/Pei/PeiMain.inf > > index 0cf357371a16..73738c939ac7 100644 > > --- a/MdeModulePkg/Core/Pei/PeiMain.inf > > +++ b/MdeModulePkg/Core/Pei/PeiMain.inf > > @@ -66,6 +66,7 @@ [LibraryClasses] > >    PeCoffLib > >    PeiServicesTablePointerLib > >    PcdLib > > +  TimerLib > > [Guids] > >    gPeiAprioriFileNameGuid       ## SOMETIMES_CONSUMES   > ## File > > @@ -78,6 +79,7 @@ [Guids] > >    gEfiFirmwareFileSystem3Guid > >    gStatusCodeCallbackGuid > >    gEdkiiMigratedFvInfoGuid                      ## > > SOMETIMES_PRODUCES     ## HOB > > +  gEfiDelayedDispatchTableGuid                  ## > > SOMETIMES_PRODUCES     ## HOB > > [Ppis] > >    gEfiPeiStatusCodePpiGuid                      ## > > SOMETIMES_CONSUMES # PeiReportStatusService is not ready > if this PPI > > doesn't exist > > @@ -100,6 +102,8 @@ [Ppis] > >    gEfiPeiReset2PpiGuid                          ## > > SOMETIMES_CONSUMES > >    gEfiSecHobDataPpiGuid                         ## > > SOMETIMES_CONSUMES > >    gEfiPeiCoreFvLocationPpiGuid                  ## > > SOMETIMES_CONSUMES > > +  gEfiPeiDelayedDispatchPpiGuid                 ## > > SOMETIMES_CONSUMES > > [Liming] Here should PRODUCES. > > +  gEfiEndOfPeiSignalPpiGuid                     ## CONSUMES > > [Pcd] > >    gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreMaxPeiStackSize > > ## CONSUMES > > @@ -112,6 +116,9 @@ [Pcd] > >    gEfiMdeModulePkgTokenSpaceGuid.PcdShadowPeimOnBoot > > ## CONSUMES > >    gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack > > ## CONSUMES > > gEfiMdeModulePkgTokenSpaceGuid.PcdMigrateTemporaryRamFirmwareVolu > > mes      ## CONSUMES > > +  gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs > > ## CONSUMES > > + > > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeout > > Us      ## CONSUMES > > +  gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxEntries > > ## CONSUMES > > # [BootMode] > > # S3_RESUME             ## SOMETIMES_CONSUMES > > diff --git a/MdeModulePkg/MdeModulePkg.dec > > b/MdeModulePkg/MdeModulePkg.dec > > index 0ff058b0a9da..2f4bd2f2b773 100644 > > --- a/MdeModulePkg/MdeModulePkg.dec > > +++ b/MdeModulePkg/MdeModulePkg.dec > > @@ -418,6 +418,9 @@ [Guids] > >    ## Include/Guid/MigratedFvInfo.h > >    gEdkiiMigratedFvInfoGuid = { 0xc1ab12f7, 0x74aa, > 0x408d, { 0xa2, 0xf4, > > 0xc6, 0xce, 0xfd, 0x17, 0x98, 0x71 } } > > +  ## Delayed Dispatch table GUID > > +  gEfiDelayedDispatchTableGuid = { 0x4b733449, 0x8eff, > 0x488c, {0x92, > > 0x1a, 0x15, 0x4a, 0xda, 0x25, 0x18, 0x07}} > > + > > [Liming] This GUID is only used in PeiMain. I suggest to > define the global > > GUID variable in PeiCore for this usage. > >    # > >    # GUID defined in UniversalPayload > >    # > > @@ -991,6 +994,18 @@ [PcdsFixedAtBuild] > >    # @ValidList  0x80000006 | 0x03058002 > > gEfiMdeModulePkgTokenSpaceGuid.PcdErrorCodeSetVariable|0x03058002|U > > INT32|0x30001040 > > +  ## Delayed Dispatch Maximum Delay in us (microseconds) > > +  # Maximum delay for any particular delay request - 5 > seconds > > + > > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs|500000 > > 0|UINT32|0x3000104A > > + > > +  ## Delayed Dispatch timeout in us (microseconds) > > +  # Maximum delay when waiting for completion (ie > EndOfPei) - 10 seconds > > + > > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeout > > Us|10000000|UINT32|0x3000104B > > + > > +  ## Delayed Dispatch Max Entries > > +  # Maximum number of delayed dispatch entries > > + > > gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxEntries|8|UINT3 > > 2|0x3000104C > > + > > [Liming] I suggest to define MACRO in PeiCore for them. If > there is real > > usage model, new PCD can be introduced later. > > Thanks > > Liming > >    ## Mask to control the NULL address detection in code > for different > > phases. > >    #  If enabled, accessing NULL address in UEFI or SMM > code can be > > caught.

> >    #    BIT0    - Enable NULL pointer detection for UEFI.
> > -- > > 2.41.0.windows.2 > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#109471): https://edk2.groups.io/g/devel/message/109471 Mute This Topic: https://groups.io/mt/101812406/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=- --------------QdkAFi9dpbV0e6vDgKiO88nZ Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi Liming,

I updated this patch to use macro definition and incorporated other changes as you suggested in v2. Could you please review when you have a chance?

Any input is appreciated.

Regards,
Kun

On 10/6/2023 10:13 PM, gaoliming via groups.io wrote:

Kun:

 For this usage, this PCD is not required. We can update the code logic to avoid new PCD. You can set the default PPI number for current usage. If so, PPI number will not be increased.

 

Thanks

Liming

发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Kun Qin
发送时间: 2023年10月4日 22:54
收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
抄送: 'Jian J Wang' <jian.j.wang@intel.com>; 'Dandan Bi' <dandan.bi@intel.com>; 'Debkumar De' <debkumar.de@intel.com>; 'Catharine West' <catharine.west@intel.com>; 'Mike Turner' <mikeyt@pobox.com>
主题: Re: 回复: [edk2-devel] 回复: [PATCH v1 3/4] MdeModulePkg: PeiMain: Introduce implementation of delayed dispatch

 

Hi Liming,

Sorry for the delayed response on this patch. I went on leave while collecting opinions regarding your feedback.

The concern we have for increasing the entry number during boot time is that this PPI is designed to be available at pre-mem phase. The practical usage would be a small number of platforms just needing an additional one or two slots, which we think this is ideal for a build time PCD. Could you please let us know how you think?

Thanks,
Kun

On 8/1/2023 10:15 PM, gaoliming via groups.io wrote:

Kun:

 PcdDelayedDispatchMaxEntries is not required. The required Entry number can be increased at boot time. You can see MaxFvCount in PrivateData that is increased by FV_GROWTH_STEP

 

Thanks

Liming

发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Kun Qin
发送时间: 2023年8月1日 12:16
收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
抄送: 'Jian J Wang' <jian.j.wang@intel.com>; 'Dandan Bi' <dandan.bi@intel.com>; 'Debkumar De' <debkumar.de@intel.com>; 'Catharine West' <catharine.west@intel.com>; 'Mike Turner' <mikeyt@pobox.com>
主题: Re: [edk2-devel] 回复: [PATCH v1 3/4] MdeModulePkg: PeiMain: Introduce implementation of delayed dispatch

 

Hi Liming,

Thanks for the feedback.

Per your feedback (I suggest to define MACRO in PeiCore for them. If there is real usage model, new PCD can be introduced later.) on the following new PCDs:

gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs
gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeoutUs
gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxEntries

Given this feature has been used internally at Project MU for a while, I
collected some feedback from the consumer platforms:

- Delayed dispatch is a feature that can be used for power up sequence, and
thus the value of maximum entries in this case can depend on the number of PCI
devices on the platform, and thus hardcoding the value as a macro definition will
limit the usage and we might come to update it very soon.

- There is already usage on our platforms that would override the timeout PCDs
to based on the firmware builds. For example, on a test build, we might register extra
entries to the PPI and thus extend the completion timeout.

I agree with your comments on other fronts. Please let me know if you have further
concerns regarding the PCDs above. I can send out an updated version after your input
on those.

Thanks,
Kun

On 7/24/2023 7:17 PM, gaoliming via groups.io wrote:

Kun: 
  I add my comments below. 
 
-----邮件原件-----
发件人: Kun Qin <kuqin12@gmail.com>
发送时间: 2023年7月21日 5:07
收件人: devel@edk2.groups.io
抄送: Jian J Wang <jian.j.wang@intel.com>; Dandan Bi
<dandan.bi@intel.com>; Liming Gao <gaoliming@byosoft.com.cn>;
Debkumar De <debkumar.de@intel.com>; Catharine West
<catharine.west@intel.com>; Mike Turner <mikeyt@pobox.com>
主题: [PATCH v1 3/4] MdeModulePkg: PeiMain: Introduce implementation of
delayed dispatch
 
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4496
 
This change adds the implementation that fits the needs and description
of PI spec defined Delayed Dispatch PPI in Pei Core.
 
The PPI would allow minimal delay for registered callbacks. As well as
allowing other functions to wait for GUIDed delayed dispatch callbacks.
 
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Debkumar De <debkumar.de@intel.com>
Cc: Catharine West <catharine.west@intel.com>
 
Co-authored-by: Mike Turner <mikeyt@pobox.com>
Signed-off-by: Kun Qin <kuqin12@gmail.com>
---
 MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c | 353
++++++++++++++++++++
 MdeModulePkg/Core/Pei/PeiMain/PeiMain.c       |   3 +
 MdeModulePkg/Core/Pei/PeiMain.h               |  76 +++++
 MdeModulePkg/Core/Pei/PeiMain.inf             |   7 +
 MdeModulePkg/MdeModulePkg.dec                 |  15 +
 5 files changed, 454 insertions(+)
 
diff --git a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
index 5f32ebb560ae..50e59bdbe732 100644
--- a/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
+++ b/MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c
@@ -3,12 +3,339 @@
 
 
 Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
 
 (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
 
+Copyright (c) Microsoft Corporation.
 
 SPDX-License-Identifier: BSD-2-Clause-Patent
 
 
 
 **/
 
 
 
 #include "PeiMain.h"
 
 
 
+/**
 
+  DelayedDispatchDispatcher
 
+
 
+  ayed Dispach cycle (ie one pass) through each entry, calling functions
when their
 
+  e has expired.  When UniqueId is specified, if there are any of the
specified entries
 
+  the dispatch queue during dispatch, repeat the DelayedDispatch cycle.
 
+
 
[Liming] Above comments are incomplete. Please update. 
 
+  @param DelayedDispatchTable  Pointer to dispatch table
 
+  @param OPTIONAL              UniqueId used to insure particular
time is met.
 
+
 
+  @return BOOLEAN
 
+**/
 
+BOOLEAN
 
+DelayedDispatchDispatcher (
 
+  IN DELAYED_DISPATCH_TABLE  *DelayedDispatchTable,
 
+  IN EFI_GUID                *UniqueId           OPTIONAL
 
+  );
 
+
 
+/**
 
+  DelayedDispatch End of PEI callback function. Insure that all of the
delayed dispatch
 
+  entries are complete before exiting PEI.
 
+
 
+  @param[in] PeiServices   - Pointer to PEI Services Table.
 
+  @param[in] NotifyDesc    - Pointer to the descriptor for the
Notification
event that
 
+                             caused this function to execute.
 
+  @param[in] Ppi           - Pointer to the PPI data associated with this
function.
 
+
 
+  @retval EFI_STATUS       - Always return EFI_SUCCESS
 
+**/
 
+EFI_STATUS
 
+EFIAPI
 
+PeiDelayedDispatchOnEndOfPei (
 
+  IN EFI_PEI_SERVICES           **PeiServices,
 
+  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc,
 
+  IN VOID                       *Ppi
 
+  );
 
+
 
+EFI_DELAYED_DISPATCH_PPI  mDelayedDispatchPpi  =
{ PeiDelayedDispatchRegister, PeiDelayedDispatchWaitOnUniqueId };
 
+EFI_PEI_PPI_DESCRIPTOR    mDelayedDispatchDesc = {
 
+  (EFI_PEI_PPI_DESCRIPTOR_PPI |
EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
 
+  &gEfiPeiDelayedDispatchPpiGuid,
 
+  &mDelayedDispatchPpi
 
+};
 
+
 
+EFI_PEI_NOTIFY_DESCRIPTOR  mDelayedDispatchNotifyDesc = {
 
+  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK |
EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
 
+  &gEfiEndOfPeiSignalPpiGuid,
 
+  PeiDelayedDispatchOnEndOfPei
 
+};
 
+
 
+/**
 
+  Helper function to look up DELAYED_DISPATCH_TABLE published in HOB.
 
+
 
+  @return Pointer to DELAYED_DISPATCH_TABLE from HOB
 
+**/
 
+DELAYED_DISPATCH_TABLE *
 
+GetDelayedDispatchTable (
 
+  VOID
 
+  )
 
+{
 
+  EFI_HOB_GUID_TYPE  *GuidHob;
 
+
 
+  GuidHob = GetFirstGuidHob (&gEfiDelayedDispatchTableGuid);
 
+  if (NULL == GuidHob) {
 
+    DEBUG ((DEBUG_ERROR, "Delayed Dispatch PPI ERROR - Delayed
Dispatch Hob not available.\n"));
 
+    ASSERT (FALSE);
 
+    return NULL;
 
+  }
 
+
 
+  return (DELAYED_DISPATCH_TABLE *)GET_GUID_HOB_DATA (GuidHob);
 
+}
 
+
 
+/**
 
+Register a callback to be called after a minimum delay has occurred.
 
+
 
+This service is the single member function of the
EFI_DELAYED_DISPATCH_PPI
 
+
 
+  @param[in] This           Pointer to the EFI_DELAYED_DISPATCH_PPI
instance
 
+  @param[in] Function       Function to call back
 
+  @param[in] Context        Context data
 
+  @param[in] UniqueId       GUID for this Delayed Dispatch request.
 
+  @param[in] Delay          Delay interval
 
+
 
+  @retval EFI_SUCCESS               Function successfully loaded
 
+  @retval EFI_INVALID_PARAMETER     One of the Arguments is not
supported
 
+  @retval EFI_OUT_OF_RESOURCES      No more entries
 
+
 
+**/
 
+EFI_STATUS
 
+EFIAPI
 
+PeiDelayedDispatchRegister (
 
+  IN  EFI_DELAYED_DISPATCH_PPI       *This,
 
+  IN  EFI_DELAYED_DISPATCH_FUNCTION  Function,
 
+  IN  UINT64                         Context,
 
+  IN  EFI_GUID                       *UniqueId   OPTIONAL,
 
+  IN  UINT32                         Delay
 
+  )
 
+{
 
+  DELAYED_DISPATCH_TABLE  *DelayedDispatchTable;
 
+  DELAYED_DISPATCH_ENTRY  *Entry;
 
+
 
+  // Check input parameters
 
+  if ((NULL == Function) || (Delay > FixedPcdGet32
(PcdDelayedDispatchMaxDelayUs)) || (NULL == This)) {
 
+    DEBUG ((DEBUG_ERROR, "%a Invalid parameter\n", __func__));
 
+    return EFI_INVALID_PARAMETER;
 
+  }
 
+
 
+  // Get delayed dispatch table
 
+  DelayedDispatchTable = GetDelayedDispatchTable ();
 
+  if (NULL == DelayedDispatchTable) {
 
+    DEBUG ((DEBUG_ERROR, "%a Unable to locate dispatch table\n",
__func__));
 
+    return EFI_UNSUPPORTED;
 
+  }
 
+
 
+  // Check for available entry slots
 
+  if (DelayedDispatchTable->Count >= FixedPcdGet32
(PcdDelayedDispatchMaxEntries)) {
 
+    ASSERT (DelayedDispatchTable->Count < FixedPcdGet32
(PcdDelayedDispatchMaxEntries));
 
+    DEBUG ((DEBUG_ERROR, "%a Too many entries requested\n",
__func__));
 
+    return EFI_OUT_OF_RESOURCES;
 
+  }
 
+
 
+  Entry               =
&(DelayedDispatchTable->Entry[DelayedDispatchTable->Count]);
 
+  Entry->Function     = Function;
 
+  Entry->Context      = Context;
 
+  Entry->DispatchTime = GET_TIME_IN_US () + Delay;
 
+  if (NULL != UniqueId) {
 
+    CopyGuid (&Entry->UniqueId, UniqueId);
 
+  } else {
 
+    ZeroMem (&Entry->UniqueId, sizeof (EFI_GUID));
 
+  }
 
+
 
+  Entry->MicrosecondDelay = Delay;
 
+  DelayedDispatchTable->Count++;
 
+
 
+  DEBUG ((DEBUG_INFO, "%a  Adding dispatch Entry\n", __func__));
 
+  DEBUG ((DEBUG_INFO, "    Requested Delay = %d\n", Delay));
 
+  DEBUG ((DEBUG_INFO, "    Trigger Time = %d\n",
Entry->DispatchTime));
 
+  DEBUG ((DEBUG_INFO, "    Context = 0x%08lx\n", Entry->Context));
 
+  DEBUG ((DEBUG_INFO, "    Function = %p\n", Entry->Function));
 
+  DEBUG ((DEBUG_INFO, "    GuidHandle = %g\n", &(Entry->UniqueId)));
 
+
 
+  if (0 == Delay) {
 
+    // Force early dispatch point
 
+    DelayedDispatchDispatcher (DelayedDispatchTable, NULL);
 
+  }
 
+
 
+  return EFI_SUCCESS;
 
+}
 
+
 
+/**
 
+  DelayedDispatchDispatcher
 
+
 
+  ayed Dispach cycle (ie one pass) through each entry, calling functions
when their
 
+  e has expired.  When UniqueId is specified, if there are any of the
specified entries
 
+  the dispatch queue during dispatch, repeat the DelayedDispatch cycle.
 
+
 
+  @param DelayedDispatchTable  Pointer to dispatch table
 
+  @param OPTIONAL              UniqueId used to insure particular
time is met.
 
+
 
+  @return BOOLEAN
 
+**/
 
+BOOLEAN
 
+DelayedDispatchDispatcher (
 
+  IN DELAYED_DISPATCH_TABLE  *DelayedDispatchTable,
 
+  IN EFI_GUID                *UniqueId           OPTIONAL
 
+  )
 
+{
 
+  BOOLEAN                 Dispatched;
 
+  UINT32                  TimeCurrent;
 
+  UINT32                  MaxDispatchTime;
 
+  UINTN                   Index1;
 
+  BOOLEAN                 UniqueIdPresent;
 
+  DELAYED_DISPATCH_ENTRY  *Entry;
 
+
 
+  Dispatched      = FALSE;
 
+  UniqueIdPresent = TRUE;
 
+  MaxDispatchTime = GET_TIME_IN_US () + FixedPcdGet32
(PcdDelayedDispatchCompletionTimeoutUs);
 
+  while ((DelayedDispatchTable->Count > 0) && (UniqueIdPresent)) {
 
+    UniqueIdPresent = FALSE;
 
+    DelayedDispatchTable->DispCount++;
 
+
 
+    // If dispatching is messed up, clear DelayedDispatchTable and exit.
 
+    TimeCurrent =  GET_TIME_IN_US ();
 
+    if (TimeCurrent > MaxDispatchTime) {
 
+      DEBUG ((DEBUG_ERROR, "%a - DelayedDispatch Completion
timeout!\n", __func__));
 
+      ReportStatusCode ((EFI_ERROR_MAJOR | EFI_ERROR_CODE),
(EFI_SOFTWARE_PEI_CORE | EFI_SW_EC_ABORTED));
 
+      ASSERT (FALSE);
 
+      DelayedDispatchTable->Count = 0;
 
+      break;
 
+    }
 
+
 
+    // Check each entry in the table for possible dispatch
 
+    for (Index1 = 0; Index1 < DelayedDispatchTable->Count;) {
 
+      Entry = &(DelayedDispatchTable->Entry[Index1]);
 
+      // If UniqueId is present, insure there is an additional check of
the
table.
 
+      if (NULL != UniqueId) {
 
+        if (CompareGuid (UniqueId, &Entry->UniqueId)) {
 
+          UniqueIdPresent = TRUE;
 
+        }
 
+      }
 
+
 
+      TimeCurrent =  GET_TIME_IN_US ();
 
+      if (TimeCurrent >= Entry->DispatchTime) {
 
+        // Time expired, invoked the function
 
+        DEBUG ((
 
+          DEBUG_ERROR,
 
+          "Delayed dispatch entry %d @ %p, Target=%d, Act=%d
Disp=%d\n",
 
+          Index1,
 
+          Entry->Function,
 
+          Entry->DispatchTime,
 
+          TimeCurrent,
 
+          DelayedDispatchTable->DispCount
 
+          ));
 
+        Dispatched              = TRUE;
 
+        Entry->MicrosecondDelay = 0;
 
+        Entry->Function (
 
+                 &Entry->Context,
 
+                 &Entry->MicrosecondDelay
 
+                 );
 
+        DEBUG ((DEBUG_ERROR, "Delayed dispatch Function returned
delay=%d\n", Entry->MicrosecondDelay));
 
+        if (0 == Entry->MicrosecondDelay) {
 
+          // NewTime = 0 = delete this entry from the table
 
+          DelayedDispatchTable->Count--;
 
+          CopyMem (Entry, Entry+1, sizeof (DELAYED_DISPATCH_ENTRY)
* (DelayedDispatchTable->Count - Index1));
 
+        } else {
 
+          if (Entry->MicrosecondDelay > FixedPcdGet32
(PcdDelayedDispatchMaxDelayUs)) {
 
+            DEBUG ((DEBUG_ERROR, "%a Illegal new delay %d
requested\n", __func__, Entry->MicrosecondDelay));
 
+            ASSERT (FALSE);
 
+            Entry->MicrosecondDelay = FixedPcdGet32
(PcdDelayedDispatchMaxDelayUs);
 
+          }
 
+
 
+          // NewTime != 0 - update the time from us to Dispatch time
 
+          Entry->DispatchTime =  GET_TIME_IN_US () +
Entry->MicrosecondDelay;
 
+          Index1++;
 
+        }
 
+      } else {
 
+        Index1++;
 
+      }
 
+    }
 
+  }
 
+
 
+  return Dispatched;
 
+}
 
+
 
+/**
 
+  Wait on a registered Delayed Dispatch unit that has a UniqueId.
Continue
 
+  to dispatch all registered delayed dispatch entries until *ALL* entries
with
 
+  UniqueId have completed.
 
+
 
+  @param[in]     This            The Delayed Dispatch PPI pointer.
 
+  @param[in]     UniqueId        UniqueId of delayed dispatch entry.
 
+
 
+  @retval EFI_SUCCESS            The operation succeeds.
 
+  @retval EFI_INVALID_PARAMETER  The parameters are invalid.
 
+
 
+**/
 
+EFI_STATUS
 
+EFIAPI
 
+PeiDelayedDispatchWaitOnUniqueId (
 
+  IN EFI_DELAYED_DISPATCH_PPI  *This,
 
+  IN EFI_GUID                  *UniqueId
 
+  )
 
+{
 
+  PERF_FUNCTION_BEGIN ();
 
+  DELAYED_DISPATCH_TABLE  *DelayedDispatchTable;
 
+
 
+  // Get delayed dispatch table
 
+  DelayedDispatchTable = GetDelayedDispatchTable ();
 
+  if (NULL == DelayedDispatchTable) {
 
+    PERF_FUNCTION_END ();
 
+    return EFI_UNSUPPORTED;
 
+  }
 
+
 
+  if ((NULL == UniqueId) || (IsZeroGuid (UniqueId))) {
 
+    ASSERT (FALSE);
 
+    PERF_FUNCTION_END ();
 
+    return EFI_UNSUPPORTED;
 
+  }
 
+
 
+  DEBUG ((DEBUG_INFO, "Delayed dispatch on %g. Count=%d,
DispatchCount=%d\n", UniqueId, DelayedDispatchTable->Count,
DelayedDispatchTable->DispCount));
 
+  PERF_EVENT_SIGNAL_BEGIN (UniqueId);
 
+  DelayedDispatchDispatcher (DelayedDispatchTable, UniqueId);
 
+  PERF_EVENT_SIGNAL_END (UniqueId);
 
+
 
+  PERF_FUNCTION_END ();
 
+  return EFI_SUCCESS;
 
+}
 
+
 
+/**
 
+  DelayedDispatch End of PEI callback function. Insure that all of the
delayed dispatch
 
+  entries are complete before exiting PEI.
 
+
 
+  @param[in] PeiServices   - Pointer to PEI Services Table.
 
+  @param[in] NotifyDesc    - Pointer to the descriptor for the
Notification
event that
 
+                             caused this function to execute.
 
+  @param[in] Ppi           - Pointer to the PPI data associated with this
function.
 
+
 
+  @retval EFI_STATUS       - Always return EFI_SUCCESS
 
+**/
 
+EFI_STATUS
 
+EFIAPI
 
+PeiDelayedDispatchOnEndOfPei (
 
+  IN EFI_PEI_SERVICES           **PeiServices,
 
+  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDesc,
 
+  IN VOID                       *Ppi
 
+  )
 
+{
 
+  DELAYED_DISPATCH_TABLE  *DelayedDispatchTable;
 
+
 
+  // Get delayed dispatch table
 
+  DelayedDispatchTable = GetDelayedDispatchTable ();
 
+  if (NULL == DelayedDispatchTable) {
 
+    return EFI_UNSUPPORTED;
 
+  }
 
+
 
+  PERF_INMODULE_BEGIN ("PerfDelayedDispatchEndOfPei");
 
+  while (DelayedDispatchTable->Count > 0) {
 
+    DelayedDispatchDispatcher (DelayedDispatchTable, NULL);
 
+  }
 
+
 
+  DEBUG ((DEBUG_ERROR, "%a Count of dispatch cycles is %d\n", __func__,
DelayedDispatchTable->DispCount));
 
+  PERF_INMODULE_END ("PerfDelayedDispatchEndOfPei");
 
+
 
+  return EFI_SUCCESS;
 
+}
 
+
 
 /**
 
 
 
   Discover all PEIMs and optional Apriori file in one FV. There is at
most one
 
@@ -1365,12 +1692,31 @@ PeiDispatcher (
   EFI_PEI_FILE_HANDLE     SaveCurrentFileHandle;
 
   EFI_FV_FILE_INFO        FvFileInfo;
 
   PEI_CORE_FV_HANDLE      *CoreFvHandle;
 
+  EFI_HOB_GUID_TYPE       *GuidHob;
 
+  UINT32                  TableSize;
 
 
 
   PeiServices    = (CONST EFI_PEI_SERVICES **)&Private->Ps;
 
   PeimEntryPoint = NULL;
 
   PeimFileHandle = NULL;
 
   EntryPoint     = 0;
 
 
 
+  if (NULL == Private->DelayedDispatchTable) {
 
+    GuidHob = GetFirstGuidHob (&gEfiDelayedDispatchTableGuid);
 
+    if (NULL != GuidHob) {
 
+      Private->DelayedDispatchTable = (DELAYED_DISPATCH_TABLE
*)(GET_GUID_HOB_DATA (GuidHob));
 
+    } else {
 
+      TableSize                     = sizeof
(DELAYED_DISPATCH_TABLE) + ((FixedPcdGet32
(PcdDelayedDispatchMaxEntries) - 1) * sizeof (DELAYED_DISPATCH_ENTRY));
 
+      Private->DelayedDispatchTable = BuildGuidHob
(&gEfiDelayedDispatchTableGuid, TableSize);
 
+      if (NULL != Private->DelayedDispatchTable) {
 
+        ZeroMem (Private->DelayedDispatchTable, TableSize);
 
+        Status = PeiServicesInstallPpi (&mDelayedDispatchDesc);
 
+        ASSERT_EFI_ERROR (Status);
 
+        Status = PeiServicesNotifyPpi (&mDelayedDispatchNotifyDesc);
 
+        ASSERT_EFI_ERROR (Status);
 
+      }
 
+    }
 
+  }
 
+
 
   if ((Private->PeiMemoryInstalled) &&
 
       (PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes) ||
 
        (Private->HobList.HandoffInformationTable->BootMode !=
BOOT_ON_S3_RESUME) ||
 
@@ -1621,6 +1967,13 @@ PeiDispatcher (
             }
 
           }
 
         }
 
+
 
+        // Dispatch pending delalyed dispatch requests
 
+        if (NULL != Private->DelayedDispatchTable) {
 
+          if (DelayedDispatchDispatcher (Private->DelayedDispatchTable,
NULL)) {
 
+            ProcessDispatchNotifyList (Private);
 
+          }
 
+        }
 
       }
 
 
 
       //
 
diff --git a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
index bf1719d7941a..e5643adf7027 100644
--- a/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
+++ b/MdeModulePkg/Core/Pei/PeiMain/PeiMain.c
@@ -277,6 +277,9 @@ PeiCore (
         OldCoreData->TempFileHandles = (EFI_PEI_FILE_HANDLE
*)((UINT8 *)OldCoreData->TempFileHandles - OldCoreData->HeapOffset);
 
       }
 
 
 
+      // Force relocating the dispatch table
 
+      OldCoreData->DelayedDispatchTable = NULL;
 
+
 
       //
 
       // Fixup for PeiService's address
 
       //
 
diff --git a/MdeModulePkg/Core/Pei/PeiMain.h
b/MdeModulePkg/Core/Pei/PeiMain.h
index 556beddad533..3b8bbe7f25a1 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.h
+++ b/MdeModulePkg/Core/Pei/PeiMain.h
@@ -11,6 +11,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 
 #include <PiPei.h>
 
 #include <Ppi/DxeIpl.h>
 
+#include <Ppi/DelayedDispatch.h>
 
+#include <Ppi/EndOfPeiPhase.h>
 
 #include <Ppi/MemoryDiscovered.h>
 
 #include <Ppi/StatusCode.h>
 
 #include <Ppi/Reset.h>
 
@@ -41,6 +43,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #include <IndustryStandard/PeImage.h>
 
 #include <Library/PeiServicesTablePointerLib.h>
 
 #include <Library/MemoryAllocationLib.h>
 
+#include <Library/TimerLib.h>
 
 #include <Guid/FirmwareFileSystem2.h>
 
 #include <Guid/FirmwareFileSystem3.h>
 
 #include <Guid/AprioriFileName.h>
 
@@ -207,6 +210,29 @@ EFI_STATUS
 
 
 #define PEI_CORE_HANDLE_SIGNATURE  SIGNATURE_32('P','e','i','C')
 
 
 
+#define GET_TIME_IN_US()
((UINT32)DivU64x32(GetTimeInNanoSecond(GetPerformanceCounter ()),
1000))
 
+
 
+//
 
+// Internal structure for delayed dispatch entries.
 
+//
 
+#pragma pack (push, 1)
 
+
 
+typedef struct {
 
+  EFI_GUID                         UniqueId;
 
+  UINT64                           Context;
 
+  EFI_DELAYED_DISPATCH_FUNCTION    Function;
 
+  UINT32                           DispatchTime;
 
+  UINT32                           MicrosecondDelay;
 
+} DELAYED_DISPATCH_ENTRY;
 
+
 
+typedef struct {
 
+  UINT32                    Count;
 
+  UINT32                    DispCount;
 
+  DELAYED_DISPATCH_ENTRY    Entry[1];     // Actual size based on
PCD PcdDelayedDispatchMaxEntries;
 
+} DELAYED_DISPATCH_TABLE;
 
+
 
+#pragma pack (pop)
 
+
 
 ///
 
 /// Pei Core private data structure instance
 
 ///
 
@@ -307,6 +333,11 @@ struct _PEI_CORE_INSTANCE {
   // Those Memory Range will be migrated into physical memory.
 
   //
 
   HOLE_MEMORY_DATA
HoleData[HOLE_MAX_NUMBER];
 
+
 
+  //
 
+  // Table of delayed dispatch requests
 
+  //
 
+  DELAYED_DISPATCH_TABLE            *DelayedDispatchTable;
 
 };
 
 
 
 ///
 
@@ -2038,4 +2069,49 @@ PeiReinitializeFv (
   IN  PEI_CORE_INSTANCE  *PrivateData
 
   );
 
 
 
+/**
 
+Register a callback to be called after a minimum delay has occurred.
 
+
 
+This service is the single member function of the
EFI_DELAYED_DISPATCH_PPI
 
+
 
+  @param[in] This           Pointer to the EFI_DELAYED_DISPATCH_PPI
instance
 
+  @param[in] Function       Function to call back
 
+  @param[in] Context        Context data
 
+  @param[in] UniqueId       GUID for this Delayed Dispatch request.
 
+  @param[in] Delay          Delay interval
 
+
 
+  @retval EFI_SUCCESS               Function successfully loaded
 
+  @retval EFI_INVALID_PARAMETER     One of the Arguments is not
supported
 
+  @retval EFI_OUT_OF_RESOURCES      No more entries
 
+
 
+**/
 
+EFI_STATUS
 
+EFIAPI
 
+PeiDelayedDispatchRegister (
 
+  IN  EFI_DELAYED_DISPATCH_PPI       *This,
 
+  IN  EFI_DELAYED_DISPATCH_FUNCTION  Function,
 
+  IN  UINT64                         Context,
 
+  IN  EFI_GUID                       *UniqueId   OPTIONAL,
 
+  IN  UINT32                         Delay
 
+  );
 
+
 
+/**
 
+  Wait on a registered Delayed Dispatch unit that has a UniqueId.
Continue
 
+  to dispatch all registered delayed dispatch entries until *ALL* entries
with
 
+  UniqueId have completed.
 
+
 
+  @param[in]     This            The Delayed Dispatch PPI pointer.
 
+  @param[in]     UniqueId        UniqueId of delayed dispatch entry.
 
+
 
+  @retval EFI_SUCCESS            The operation succeeds.
 
+  @retval EFI_INVALID_PARAMETER  The parameters are invalid.
 
+
 
+**/
 
+EFI_STATUS
 
+EFIAPI
 
+PeiDelayedDispatchWaitOnUniqueId (
 
+  IN EFI_DELAYED_DISPATCH_PPI  *This,
 
+  IN EFI_GUID                  *UniqueId
 
+  );
 
+
 
 #endif
 
diff --git a/MdeModulePkg/Core/Pei/PeiMain.inf
b/MdeModulePkg/Core/Pei/PeiMain.inf
index 0cf357371a16..73738c939ac7 100644
--- a/MdeModulePkg/Core/Pei/PeiMain.inf
+++ b/MdeModulePkg/Core/Pei/PeiMain.inf
@@ -66,6 +66,7 @@ [LibraryClasses]
   PeCoffLib
 
   PeiServicesTablePointerLib
 
   PcdLib
 
+  TimerLib
 
 
 
 [Guids]
 
   gPeiAprioriFileNameGuid       ## SOMETIMES_CONSUMES   ## File
 
@@ -78,6 +79,7 @@ [Guids]
   gEfiFirmwareFileSystem3Guid
 
   gStatusCodeCallbackGuid
 
   gEdkiiMigratedFvInfoGuid                      ##
SOMETIMES_PRODUCES     ## HOB
 
+  gEfiDelayedDispatchTableGuid                  ##
SOMETIMES_PRODUCES     ## HOB
 
 
 
 [Ppis]
 
   gEfiPeiStatusCodePpiGuid                      ##
SOMETIMES_CONSUMES # PeiReportStatusService is not ready if this PPI
doesn't exist
 
@@ -100,6 +102,8 @@ [Ppis]
   gEfiPeiReset2PpiGuid                          ##
SOMETIMES_CONSUMES
 
   gEfiSecHobDataPpiGuid                         ##
SOMETIMES_CONSUMES
 
   gEfiPeiCoreFvLocationPpiGuid                  ##
SOMETIMES_CONSUMES
 
+  gEfiPeiDelayedDispatchPpiGuid                 ##
SOMETIMES_CONSUMES
 
[Liming] Here should PRODUCES. 
 
+  gEfiEndOfPeiSignalPpiGuid                     ## CONSUMES
 
 
 
 [Pcd]
 
   gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreMaxPeiStackSize
## CONSUMES
 
@@ -112,6 +116,9 @@ [Pcd]
   gEfiMdeModulePkgTokenSpaceGuid.PcdShadowPeimOnBoot
## CONSUMES
 
   gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
## CONSUMES
 
 
gEfiMdeModulePkgTokenSpaceGuid.PcdMigrateTemporaryRamFirmwareVolu
mes      ## CONSUMES
 
+  gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs
## CONSUMES
 
+
gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeout
Us      ## CONSUMES
 
+  gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxEntries
## CONSUMES
 
 
 
 # [BootMode]
 
 # S3_RESUME             ## SOMETIMES_CONSUMES
 
diff --git a/MdeModulePkg/MdeModulePkg.dec
b/MdeModulePkg/MdeModulePkg.dec
index 0ff058b0a9da..2f4bd2f2b773 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -418,6 +418,9 @@ [Guids]
   ## Include/Guid/MigratedFvInfo.h
 
   gEdkiiMigratedFvInfoGuid = { 0xc1ab12f7, 0x74aa, 0x408d, { 0xa2, 0xf4,
0xc6, 0xce, 0xfd, 0x17, 0x98, 0x71 } }
 
 
 
+  ## Delayed Dispatch table GUID
 
+  gEfiDelayedDispatchTableGuid = { 0x4b733449, 0x8eff, 0x488c, {0x92,
0x1a, 0x15, 0x4a, 0xda, 0x25, 0x18, 0x07}}
 
+
[Liming] This GUID is only used in PeiMain. I suggest to define the global
GUID variable in PeiCore for this usage.
 
 
   #
 
   # GUID defined in UniversalPayload
 
   #
 
@@ -991,6 +994,18 @@ [PcdsFixedAtBuild]
   # @ValidList  0x80000006 | 0x03058002
 
 
gEfiMdeModulePkgTokenSpaceGuid.PcdErrorCodeSetVariable|0x03058002|U
INT32|0x30001040
 
 
 
+  ## Delayed Dispatch Maximum Delay in us (microseconds)
 
+  # Maximum delay for any particular delay request - 5 seconds
 
+
gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxDelayUs|500000
0|UINT32|0x3000104A
 
+
 
+  ## Delayed Dispatch timeout in us (microseconds)
 
+  # Maximum delay when waiting for completion (ie EndOfPei) - 10 seconds
 
+
gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchCompletionTimeout
Us|10000000|UINT32|0x3000104B
 
+
 
+  ## Delayed Dispatch Max Entries
 
+  # Maximum number of delayed dispatch entries
 
+
gEfiMdeModulePkgTokenSpaceGuid.PcdDelayedDispatchMaxEntries|8|UINT3
2|0x3000104C
 
+
[Liming] I suggest to define MACRO in PeiCore for them. If there is real
usage model, new PCD can be introduced later. 
 
Thanks
Liming
 
   ## Mask to control the NULL address detection in code for different
phases.
 
   #  If enabled, accessing NULL address in UEFI or SMM code can be
caught.<BR><BR>
 
   #    BIT0    - Enable NULL pointer detection for UEFI.<BR>
 
--
2.41.0.windows.2
 
 
 
 
 
 
 
 
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