> -Original Message-
> From: Kubacki, Michael A
> Sent: Saturday, September 28, 2019 9:47 AM
> To: devel@edk2.groups.io
> Cc: Bi, Dandan; Ard Biesheuvel; Dong, Eric; Laszlo Ersek; Gao, Liming; Kinney,
> Michael D; Ni, Ray; Wang, Jian J; Wu, Hao A; Yao, Jiewen
> Subject: [PATCH V2 6/9] MdeModulePkg VariableInfo: Always consider RT
> DXE and SMM stats
>
> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2220
>
> The current VariableInfo application only checks for variable
> statistics from SMM if the variable information entries are
> not present in the UEFI System Configuration table as published
> by the DXE UEFI variable driver (VariableRuntimeDxe).
>
> This change first checks for variable information entries in the
> UEFI System Configuration but always checks for entries in SMM
> as well. If the SMM variable driver is not present, an instance of
> EFI_SMM_VARIABLE_PROTOCOL will not be found and the search for
> SMM variable statistics will be aborted (an SW SMI to get variable
> statistics will not be triggered).
>
> In the case variable statistics are provided by both a Runtime DXE
> driver (e.g. VariableSmmRuntimeDxe) and a SMM driver (VariableSmm),
> this change will clearly identify statistics from each respective
> driver.
>
> Cc: Dandan Bi
> Cc: Ard Biesheuvel
> Cc: Eric Dong
> Cc: Laszlo Ersek
> Cc: Liming Gao
> Cc: Michael D Kinney
> Cc: Ray Ni
> Cc: Jian J Wang
> Cc: Hao A Wu
> Cc: Jiewen Yao
> Signed-off-by: Michael Kubacki
> ---
> MdeModulePkg/Application/VariableInfo/VariableInfo.c | 37 ++--
>
> 1 file changed, 18 insertions(+), 19 deletions(-)
>
> diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.c
> b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
> index f213471e9a..c04ba18213 100644
> --- a/MdeModulePkg/Application/VariableInfo/VariableInfo.c
> +++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
> @@ -3,7 +3,7 @@
>this utility will print out the statistics information. You can use console
>redirection to capture the data.
>
> - Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.
> + Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.
>SPDX-License-Identifier: BSD-2-Clause-Patent
>
> **/
> @@ -126,7 +126,7 @@ PrintInfoFromSmm (
>ASSERT (CommBuffer != NULL);
>ZeroMem (CommBuffer, RealCommSize);
>
> - Print (L"Non-Volatile SMM Variables:\n");
> + Print (L"SMM Driver Non-Volatile Variables:\n");
>do {
> CommSize = RealCommSize;
> Status = GetVariableStatisticsData (CommBuffer, );
> @@ -155,7 +155,7 @@ PrintInfoFromSmm (
> }
>} while (TRUE);
>
> - Print (L"Volatile SMM Variables:\n");
> + Print (L"SMM Driver Volatile Variables:\n");
>ZeroMem (CommBuffer, RealCommSize);
>do {
> CommSize = RealCommSize;
> @@ -207,24 +207,18 @@ UefiMain (
>IN EFI_SYSTEM_TABLE *SystemTable
>)
> {
> - EFI_STATUSStatus;
> + EFI_STATUSRuntimeDxeStatus;
> + EFI_STATUSSmmStatus;
>VARIABLE_INFO_ENTRY *VariableInfo;
>VARIABLE_INFO_ENTRY *Entry;
>
> - Status = EfiGetSystemConfigurationTable (, (VOID
> **));
> - if (EFI_ERROR (Status) || (Entry == NULL)) {
> -Status = EfiGetSystemConfigurationTable
> (, (VOID **));
> + RuntimeDxeStatus = EfiGetSystemConfigurationTable (,
> (VOID **) );
> + if (EFI_ERROR (RuntimeDxeStatus) || (Entry == NULL)) {
> +RuntimeDxeStatus = EfiGetSystemConfigurationTable
> (, (VOID **) );
>}
>
> - if (EFI_ERROR (Status) || (Entry == NULL)) {
> -Status = PrintInfoFromSmm ();
> -if (!EFI_ERROR (Status)) {
> - return Status;
> -}
> - }
> -
> - if (!EFI_ERROR (Status) && (Entry != NULL)) {
> -Print (L"Non-Volatile EFI Variables:\n");
> + if (!EFI_ERROR (RuntimeDxeStatus) && (Entry != NULL)) {
> +Print (L"Runtime DXE Driver Non-Volatile EFI Variables:\n");
> VariableInfo = Entry;
> do {
>if (!VariableInfo->Volatile) {
> @@ -242,7 +236,7 @@ UefiMain (
>VariableInfo = VariableInfo->Next;
> } while (VariableInfo != NULL);
>
> -Print (L"Volatile EFI Variables:\n");
> +Print (L"Runtime DXE Driver Volatile EFI Variables:\n");
> VariableInfo = Entry;
> do {
>if (VariableInfo->Volatile) {
> @@ -258,14 +252,19 @@ UefiMain (
>}
>VariableInfo = VariableInfo->Next;
> } while (VariableInfo != NULL);
> + }
>
> - } else {
> + SmmStatus = PrintInfoFromSmm ();
> +
> + if (EFI_ERROR (RuntimeDxeStatus) && EFI_ERROR (SmmStatus)) {
> Print (L"Warning: Variable Dxe/Smm driver doesn't enable the feature of
> statistical information!\n");
> Print (L"If you want to see this info, please:\n");
> Print (L" 1. Set PcdVariableCollectStatistics as TRUE\n");
> Print (L" 2. Rebuild Variable Dxe/Smm driver\n");
> Print (L" 3. Run \"VariableInfo\" cmd again\n");
> +
> +return EFI_NOT_FOUND;
>}
>
> - return Status;
> + return EFI_SUCCESS;
>