From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga04.intel.com (mga04.intel.com []) by mx.groups.io with SMTP id smtpd.web12.99.1571076535009144300 for ; Mon, 14 Oct 2019 11:09:03 -0700 Authentication-Results: mx.groups.io; dkim=missing; spf=fail (domain: intel.com, ip: , mailfrom: michael.a.kubacki@intel.com) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Oct 2019 11:09:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,296,1566889200"; d="scan'208";a="189094670" Received: from makuback-desk1.amr.corp.intel.com ([10.7.159.162]) by orsmga008.jf.intel.com with ESMTP; 14 Oct 2019 11:09:02 -0700 From: "Kubacki, Michael A" To: devel@edk2.groups.io Cc: Dandan Bi , Ard Biesheuvel , Eric Dong , Laszlo Ersek , Liming Gao , Michael D Kinney , Ray Ni , Jian J Wang , Hao A Wu , Jiewen Yao Subject: [PATCH V3 8/9] MdeModulePkg/Variable: Add RT GetNextVariableName() cache support Date: Mon, 14 Oct 2019 11:08:45 -0700 Message-Id: <20191014180846.31660-9-michael.a.kubacki@intel.com> X-Mailer: git-send-email 2.16.2.windows.1 In-Reply-To: <20191014180846.31660-1-michael.a.kubacki@intel.com> References: <20191014180846.31660-1-michael.a.kubacki@intel.com> https://bugzilla.tianocore.org/show_bug.cgi?id=2220 This change implements the Runtime Service GetNextVariableName() using the runtime cache in VariableSmmRuntimeDxe. Runtime Service calls to GetNextVariableName() will no longer trigger a SW SMI when gEfiMdeModulePkgTokenSpaceGuid.PcdEnableVariableRuntimeCache is set to TRUE (default value). Overall system performance and stability will be improved by eliminating an SMI for these calls as they typically result in a relatively large number of invocations to retrieve all variable names in all variable stores present. 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/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c | 137 ++++++++++++++++++-- 1 file changed, 128 insertions(+), 9 deletions(-) diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c index e236ddff33..a795b9fcab 100644 --- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c @@ -823,7 +823,7 @@ RuntimeServiceGetVariable ( } /** - This code Finds the Next available variable. + Finds the next available variable in a runtime cache variable store. @param[in, out] VariableNameSize Size of the variable name. @param[in, out] VariableName Pointer to variable name. @@ -836,8 +836,81 @@ RuntimeServiceGetVariable ( **/ EFI_STATUS -EFIAPI -RuntimeServiceGetNextVariableName ( +GetNextVariableNameInRuntimeCache ( + IN OUT UINTN *VariableNameSize, + IN OUT CHAR16 *VariableName, + IN OUT EFI_GUID *VendorGuid + ) +{ + EFI_STATUS Status; + UINTN VarNameSize; + VARIABLE_HEADER *VariablePtr; + VARIABLE_STORE_HEADER *VariableStoreHeader[VariableStoreTypeMax]; + + Status = EFI_NOT_FOUND; + + // + // The UEFI specification restricts Runtime Services callers from invoking the same or certain other Runtime Service + // functions prior to completion and return from a previous Runtime Service call. These restrictions prevent + // a GetVariable () or GetNextVariable () call from being issued until a prior call has returned. The runtime + // cache read lock should always be free when entering this function. + // + ASSERT (!mVariableRuntimeCacheReadLock); + + CheckForRuntimeCacheSync (); + + mVariableRuntimeCacheReadLock = TRUE; + if (!mVariableRuntimeCachePendingUpdate) { + // + // 0: Volatile, 1: HOB, 2: Non-Volatile. + // The index and attributes mapping must be kept in this order as FindVariable + // makes use of this mapping to implement search algorithm. + // + VariableStoreHeader[VariableStoreTypeVolatile] = mVariableRuntimeVolatileCacheBuffer; + VariableStoreHeader[VariableStoreTypeHob] = mVariableRuntimeHobCacheBuffer; + VariableStoreHeader[VariableStoreTypeNv] = mVariableRuntimeNvCacheBuffer; + + Status = VariableServiceGetNextVariableInternal ( + VariableName, + VendorGuid, + VariableStoreHeader, + &VariablePtr, + mVariableAuthFormat + ); + if (!EFI_ERROR (Status)) { + VarNameSize = NameSizeOfVariable (VariablePtr, mVariableAuthFormat); + ASSERT (VarNameSize != 0); + if (VarNameSize <= *VariableNameSize) { + CopyMem (VariableName, GetVariableNamePtr (VariablePtr, mVariableAuthFormat), VarNameSize); + CopyMem (VendorGuid, GetVendorGuidPtr (VariablePtr, mVariableAuthFormat), sizeof (EFI_GUID)); + Status = EFI_SUCCESS; + } else { + Status = EFI_BUFFER_TOO_SMALL; + } + + *VariableNameSize = VarNameSize; + } + } + mVariableRuntimeCacheReadLock = FALSE; + + return Status; +} + +/** + Finds the next available variable in a SMM variable store. + + @param[in, out] VariableNameSize Size of the variable name. + @param[in, out] VariableName Pointer to variable name. + @param[in, out] VendorGuid Variable Vendor Guid. + + @retval EFI_INVALID_PARAMETER Invalid parameter. + @retval EFI_SUCCESS Find the specified variable. + @retval EFI_NOT_FOUND Not found. + @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result. + +**/ +EFI_STATUS +GetNextVariableNameInSmm ( IN OUT UINTN *VariableNameSize, IN OUT CHAR16 *VariableName, IN OUT EFI_GUID *VendorGuid @@ -849,10 +922,6 @@ RuntimeServiceGetNextVariableName ( UINTN OutVariableNameSize; UINTN InVariableNameSize; - if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) { - return EFI_INVALID_PARAMETER; - } - OutVariableNameSize = *VariableNameSize; InVariableNameSize = StrSize (VariableName); SmmGetNextVariableName = NULL; @@ -864,8 +933,6 @@ RuntimeServiceGetNextVariableName ( return EFI_INVALID_PARAMETER; } - AcquireLockOnlyAtBootTime(&mVariableServicesLock); - // // Init the communicate buffer. The buffer data size is: // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize. @@ -924,7 +991,59 @@ RuntimeServiceGetNextVariableName ( CopyMem (VariableName, SmmGetNextVariableName->Name, SmmGetNextVariableName->NameSize); Done: + return Status; +} + +/** + This code Finds the Next available variable. + + @param[in, out] VariableNameSize Size of the variable name. + @param[in, out] VariableName Pointer to variable name. + @param[in, out] VendorGuid Variable Vendor Guid. + + @retval EFI_INVALID_PARAMETER Invalid parameter. + @retval EFI_SUCCESS Find the specified variable. + @retval EFI_NOT_FOUND Not found. + @retval EFI_BUFFER_TO_SMALL DataSize is too small for the result. + +**/ +EFI_STATUS +EFIAPI +RuntimeServiceGetNextVariableName ( + IN OUT UINTN *VariableNameSize, + IN OUT CHAR16 *VariableName, + IN OUT EFI_GUID *VendorGuid + ) +{ + EFI_STATUS Status; + UINTN MaxLen; + + Status = EFI_NOT_FOUND; + + if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) { + return EFI_INVALID_PARAMETER; + } + + // + // Calculate the possible maximum length of name string, including the Null terminator. + // + MaxLen = *VariableNameSize / sizeof (CHAR16); + if ((MaxLen == 0) || (StrnLenS (VariableName, MaxLen) == MaxLen)) { + // + // Null-terminator is not found in the first VariableNameSize bytes of the input VariableName buffer, + // follow spec to return EFI_INVALID_PARAMETER. + // + return EFI_INVALID_PARAMETER; + } + + AcquireLockOnlyAtBootTime (&mVariableServicesLock); + if (FeaturePcdGet (PcdEnableVariableRuntimeCache)) { + Status = GetNextVariableNameInRuntimeCache (VariableNameSize, VariableName, VendorGuid); + } else { + Status = GetNextVariableNameInSmm (VariableNameSize, VariableName, VendorGuid); + } ReleaseLockOnlyAtBootTime (&mVariableServicesLock); + return Status; } -- 2.16.2.windows.1