Hi Ray,
Could you help to review and merge this Vtd driver patch to edk2platforms
branch?
This patch is used to fix a bug about missing to mask one-shot bits when write
VTD GCMD_REG register.
Here is the PR of this patch.
https://github.com/tianocore/edk2-platforms/pull/125
Thank you.
BR
Sheng Wei
> -----Original Message-----
> From: Huang, Jenny <jenny.hu...@intel.com>
> Sent: Thursday, February 29, 2024 3:10 PM
> To: devel@edk2.groups.io; Sheng, W <w.sh...@intel.com>
> Cc: Ni, Ray <ray...@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaga...@intel.com>
> Subject: RE: [edk2-devel] [PATCH] IntelSiliconPkg/VTd: Reset the one-shot bits
> before modifing GCMD_REG
>
> Reviewed-by: Jenny Huang <jenny.hu...@intel.com>
>
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sheng, W
> Sent: Monday, February 19, 2024 7:37 PM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray...@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaga...@intel.com>; Huang, Jenny <jenny.hu...@intel.com>
> Subject: [edk2-devel] [PATCH] IntelSiliconPkg/VTd: Reset the one-shot bits
> before modifing GCMD_REG
>
> Here is the process of modify GCMD_REG.
> Read GSTS_REG
> Reset the one-shot bits.
> Modify the target comamnd value.
> Write the command value to GCMD_REG.
> Wait until GSTS_REG indicates command is serviced.
>
> Cc: Ray Ni <ray...@intel.com>
> Cc: Rangasai V Chaganty <rangasai.v.chaga...@intel.com>
> Cc: Jenny Huang <jenny.hu...@intel.com>
> Signed-off-by: Sheng Wei <w.sh...@intel.com>
> ---
> .../Feature/VTd/IntelVTdCoreDxe/VtdReg.c | 13 ++----
> .../VTd/IntelVTdCorePei/IntelVTdDmar.c | 9 +---
> .../VTd/IntelVTdDmarPei/IntelVTdDmar.c | 43 +++++++++---------
> .../Feature/VTd/IntelVTdDxe/VtdReg.c | 44 +++++++++----------
> .../Feature/VTd/IntelVTdPmrPei/VtdReg.c | 1 +
> .../IntelVTdPeiDxeLib/IntelVTdPeiDxeLib.c | 12 ++---
> 6 files changed, 51 insertions(+), 71 deletions(-)
>
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCoreDxe/VtdReg.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCoreDxe/VtdReg.c
> index edeb4b3ff..21e2d5f1b 100644
> --- a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCoreDxe/VtdReg.c
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCoreDxe/VtdReg.c
> @@ -112,13 +112,8 @@ PerpareCacheInvalidationInterface (
> // Enable the queued invalidation interface through the Global Command
> Register.
>
> // When enabled, hardware sets the QIES field in the Global Status
> Register.
>
> //
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 |= B_GMCD_REG_QIE;
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> - DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface. GCMD_REG =
> 0x%x\n", Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) == 0);
>
> + DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface.\n"));
>
> + VtdLibSetGlobalCommandRegisterBits (VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
>
>
> VTdLogAddEvent (VTDLOG_DXE_QUEUED_INVALIDATION,
> VTD_LOG_QI_ENABLE, VtdUnitBaseAddress);
>
>
>
> @@ -577,7 +572,7 @@ DumpVtdCapRegs (
> IN VTD_CAP_REG *CapReg
>
> )
>
> {
>
> - DEBUG((DEBUG_INFO, " CapReg - 0x%x\n", CapReg->Uint64));
>
> + DEBUG((DEBUG_INFO, " CapReg - 0x%lx\n", CapReg->Uint64));
>
> DEBUG((DEBUG_INFO, " ND - 0x%x\n", CapReg->Bits.ND));
>
> DEBUG((DEBUG_INFO, " AFL - 0x%x\n", CapReg->Bits.AFL));
>
> DEBUG((DEBUG_INFO, " RWBF - 0x%x\n", CapReg->Bits.RWBF));
>
> @@ -737,7 +732,7 @@ DumpVtdIfError (
> if (HasError) {
>
> REPORT_STATUS_CODE (EFI_ERROR_CODE, PcdGet32
> (PcdErrorCodeVTdError));
>
> DEBUG((DEBUG_INFO, "\n#### ERROR ####\n"));
>
> - DumpVtdRegs (mVtdUnitInformation[Num].VtdUnitBaseAddress);
> + DumpVtdRegs (mVtdUnitInformation[Num].VtdUnitBaseAddress);
>
> DEBUG((DEBUG_INFO, "#### ERROR ####\n\n"));
>
> //
>
> // Clear
>
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCorePei/IntelVTdDmar.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCorePei/IntelVTdDmar.c
> index 93207ba52..549313dbf 100644
> ---
> a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCorePei/IntelVTdDmar.c
> +++
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdCorePei/IntelVTdDmar.c
> @@ -120,13 +120,8 @@ PerpareCacheInvalidationInterface (
> // Enable the queued invalidation interface through the Global Command
> Register.
>
> // When enabled, hardware sets the QIES field in the Global Status
> Register.
>
> //
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 |= B_GMCD_REG_QIE;
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> - DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface. GCMD_REG =
> 0x%x\n", Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) == 0);
>
> + DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface.\n"));
>
> + VtdLibSetGlobalCommandRegisterBits (VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
>
>
> VTdLogAddEvent (VTDLOG_PEI_QUEUED_INVALIDATION,
> VTD_LOG_QI_ENABLE, VtdUnitBaseAddress);
>
>
>
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDmarPei/IntelVTdDmar.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDmarPei/IntelVTdDmar.c
> index e1b867973..533fb2b9a 100644
> ---
> a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDmarPei/IntelVTdDmar.c
> +++
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDmarPei/IntelVTdDmar.c
> @@ -20,6 +20,18 @@
> #include <Ppi/IoMmu.h>
>
> #include "IntelVTdDmarPei.h"
>
>
>
> +VOID
>
> +SetGlobalCommandRegisterBits (
>
> + IN UINTN VtdUnitBaseAddress,
>
> + IN UINT32 BitMask
>
> + );
>
> +
>
> +VOID
>
> +ClearGlobalCommandRegisterBits (
>
> + IN UINTN VtdUnitBaseAddress,
>
> + IN UINT32 BitMask
>
> + );
>
> +
>
> /**
>
> Flush VTD page table and context table memory.
>
>
>
> @@ -58,6 +70,7 @@ FlushWriteBuffer (
>
>
> if (CapReg.Bits.RWBF != 0) {
>
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> + Reg32 = (Reg32 & 0x96FFFFFF); // Reset the one-shot bits
>
> MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32 |
> B_GMCD_REG_WBF);
>
> do {
>
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> @@ -104,11 +117,7 @@ PerpareCacheInvalidationInterface (
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> if ((Reg32 & B_GSTS_REG_QIES) != 0) {
>
> DEBUG ((DEBUG_INFO,"Queued Invalidation Interface was enabled.\n"));
>
> - Reg32 &= (~B_GSTS_REG_QIES);
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) != 0);
>
> + ClearGlobalCommandRegisterBits (VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
> MmioWrite64 (VtdUnitBaseAddress + R_IQA_REG, 0);
>
> }
>
>
>
> @@ -144,13 +153,8 @@ PerpareCacheInvalidationInterface (
> // Enable the queued invalidation interface through the Global Command
> Register.
>
> // When enabled, hardware sets the QIES field in the Global Status
> Register.
>
> //
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 |= B_GMCD_REG_QIE;
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> - DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface. GCMD_REG =
> 0x%x\n", Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) == 0);
>
> + DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface.\n"));
>
> + SetGlobalCommandRegisterBits (VtdUnitBaseAddress, B_GMCD_REG_QIE);
>
>
>
> return EFI_SUCCESS;
>
> }
>
> @@ -165,16 +169,9 @@ DisableQueuedInvalidationInterface (
> IN VTD_UNIT_INFO *VTdUnitInfo
>
> )
>
> {
>
> - UINT32 Reg32;
>
> -
>
> if (VTdUnitInfo->EnableQueuedInvalidation != 0) {
>
> - Reg32 = MmioRead32 (VTdUnitInfo->VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 &= (~B_GMCD_REG_QIE);
>
> - MmioWrite32 (VTdUnitInfo->VtdUnitBaseAddress + R_GCMD_REG,
> Reg32);
>
> - DEBUG ((DEBUG_INFO, "Disable Queued Invalidation Interface. GCMD_REG
> = 0x%x\n", Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VTdUnitInfo->VtdUnitBaseAddress +
> R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) != 0);
>
> + DEBUG ((DEBUG_INFO, "Disable Queued Invalidation Interface.\n"));
>
> + ClearGlobalCommandRegisterBits (VTdUnitInfo->VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
>
>
> if (VTdUnitInfo->QiDescBuffer != NULL) {
>
> FreePages(VTdUnitInfo->QiDescBuffer, EFI_SIZE_TO_PAGES (VTdUnitInfo-
> >QiDescBufferSize));
>
> @@ -206,7 +203,7 @@ QueuedInvalidationCheckFault (
> if (FaultReg & (B_FSTS_REG_IQE | B_FSTS_REG_ITE | B_FSTS_REG_ICE)) {
>
> IqercdReg.Uint64 = MmioRead64 (VTdUnitInfo->VtdUnitBaseAddress +
> R_IQERCD_REG);
>
>
>
> - DEBUG((DEBUG_ERROR, "Detect Queue Invalidation Error [0x%08x] -
> IQERCD [0x%016lx]\n", FaultReg, IqercdReg.Uint64));
>
> + DEBUG((DEBUG_ERROR, "VTD 0x%x Detect Queue Invalidation Error
> [0x%08x] - IQERCD [0x%016lx]\n", VTdUnitInfo->VtdUnitBaseAddress,
> FaultReg, IqercdReg.Uint64));
>
>
>
> MmioWrite32 (VTdUnitInfo->VtdUnitBaseAddress + R_FSTS_REG,
> FaultReg);
>
> return RETURN_DEVICE_ERROR;
>
> @@ -763,7 +760,7 @@ EnableVTdTranslationProtection (
>
>
> if (VtdUnitInfo->ExtRootEntryTable != 0) {
>
> DEBUG ((DEBUG_INFO, "EnableVtdDmar (%d) ExtRootEntryTable 0x%x\n",
> Index, VtdUnitInfo->ExtRootEntryTable));
>
> - Status = EnableDmar (VtdUnitInfo, VtdUnitInfo->ExtRootEntryTable |
> BIT11);
> + Status = EnableDmar (VtdUnitInfo, VtdUnitInfo->ExtRootEntryTable |
> BIT11);
>
> } else {
>
> DEBUG ((DEBUG_INFO, "EnableVtdDmar (%d) RootEntryTable 0x%x\n",
> Index, VtdUnitInfo->RootEntryTable));
>
> Status = EnableDmar (VtdUnitInfo, VtdUnitInfo->RootEntryTable);
>
> diff --git a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/VtdReg.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/VtdReg.c
> index 30dab4a64..2c48eefe9 100644
> --- a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/VtdReg.c
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/VtdReg.c
> @@ -12,6 +12,18 @@ VTD_UNIT_INFORMATION
> *mVtdUnitInformation;
>
>
> BOOLEAN mVtdEnabled;
>
>
>
> +VOID
>
> +SetGlobalCommandRegisterBits (
>
> + IN UINTN VtdUnitBaseAddress,
>
> + IN UINT32 BitMask
>
> + );
>
> +
>
> +VOID
>
> +ClearGlobalCommandRegisterBits (
>
> + IN UINTN VtdUnitBaseAddress,
>
> + IN UINT32 BitMask
>
> + );
>
> +
>
> /**
>
> Flush VTD page table and context table memory.
>
>
>
> @@ -47,6 +59,7 @@ FlushWriteBuffer (
>
>
> if (mVtdUnitInformation[VtdIndex].CapReg.Bits.RWBF != 0) {
>
> Reg32 = MmioRead32
> (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_GSTS_REG);
>
> + Reg32 = (Reg32 & 0x96FFFFFF); // Reset the one-shot bits
>
> MmioWrite32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress +
> R_GCMD_REG, Reg32 | B_GMCD_REG_WBF);
>
> do {
>
> Reg32 = MmioRead32
> (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_GSTS_REG);
>
> @@ -93,11 +106,7 @@ PerpareCacheInvalidationInterface (
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> if ((Reg32 & B_GSTS_REG_QIES) != 0) {
>
> DEBUG ((DEBUG_ERROR,"Queued Invalidation Interface was enabled.\n"));
>
> - Reg32 &= (~B_GSTS_REG_QIES);
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) != 0);
>
> + ClearGlobalCommandRegisterBits (VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
> }
>
>
>
> //
>
> @@ -132,13 +141,8 @@ PerpareCacheInvalidationInterface (
> // Enable the queued invalidation interface through the Global Command
> Register.
>
> // When enabled, hardware sets the QIES field in the Global Status
> Register.
>
> //
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 |= B_GMCD_REG_QIE;
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> - DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface. GCMD_REG =
> 0x%x\n", Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) == 0);
>
> + DEBUG ((DEBUG_INFO, "Enable Queued Invalidation Interface.\n"));
>
> + SetGlobalCommandRegisterBits (VtdUnitBaseAddress, B_GMCD_REG_QIE);
>
>
>
> return EFI_SUCCESS;
>
> }
>
> @@ -153,19 +157,13 @@ DisableQueuedInvalidationInterface (
> IN UINTN VtdIndex
>
> )
>
> {
>
> - UINT32 Reg32;
>
> VTD_UNIT_INFORMATION *VTdUnitInfo;
>
>
>
> VTdUnitInfo = &mVtdUnitInformation[VtdIndex];
>
>
>
> if (VTdUnitInfo->EnableQueuedInvalidation != 0) {
>
> - Reg32 = MmioRead32 (VTdUnitInfo->VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 &= (~B_GMCD_REG_QIE);
>
> - MmioWrite32 (VTdUnitInfo->VtdUnitBaseAddress + R_GCMD_REG,
> Reg32);
>
> - DEBUG ((DEBUG_INFO, "Disable Queued Invalidation Interface. GCMD_REG
> = 0x%x\n", Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VTdUnitInfo->VtdUnitBaseAddress +
> R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) != 0);
>
> + DEBUG ((DEBUG_INFO, "Disable Queued Invalidation Interface.\n"));
>
> + ClearGlobalCommandRegisterBits (VTdUnitInfo->VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
>
>
> if (VTdUnitInfo->QiDescBuffer != NULL) {
>
> FreePages(VTdUnitInfo->QiDescBuffer, EFI_SIZE_TO_PAGES (VTdUnitInfo-
> >QiDescBufferSize));
>
> @@ -198,7 +196,7 @@ QueuedInvalidationCheckFault (
> if (FaultReg & (B_FSTS_REG_IQE | B_FSTS_REG_ITE | B_FSTS_REG_ICE)) {
>
> IqercdReg.Uint64 = MmioRead64
> (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_IQERCD_REG);
>
>
>
> - DEBUG((DEBUG_ERROR, "Detect Queue Invalidation Error [0x%08x] -
> IQERCD [0x%016lx]\n", FaultReg, IqercdReg.Uint64));
>
> + DEBUG((DEBUG_ERROR, "VTD 0x%x Detect Queue Invalidation Error
> [0x%08x] - IQERCD [0x%016lx]\n",
> mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress, FaultReg,
> IqercdReg.Uint64));
>
>
>
> MmioWrite32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress +
> R_FSTS_REG, FaultReg);
>
> return RETURN_DEVICE_ERROR;
>
> @@ -802,7 +800,7 @@ DumpVtdCapRegs (
> IN VTD_CAP_REG *CapReg
>
> )
>
> {
>
> - DEBUG((DEBUG_INFO, " CapReg - 0x%x\n", CapReg->Uint64));
>
> + DEBUG((DEBUG_INFO, " CapReg - 0x%016lx\n", CapReg->Uint64));
>
> DEBUG((DEBUG_INFO, " ND - 0x%x\n", CapReg->Bits.ND));
>
> DEBUG((DEBUG_INFO, " AFL - 0x%x\n", CapReg->Bits.AFL));
>
> DEBUG((DEBUG_INFO, " RWBF - 0x%x\n", CapReg->Bits.RWBF));
>
> @@ -833,7 +831,7 @@ DumpVtdECapRegs (
> IN VTD_ECAP_REG *ECapReg
>
> )
>
> {
>
> - DEBUG((DEBUG_INFO, " ECapReg - 0x%x\n", ECapReg->Uint64));
>
> + DEBUG((DEBUG_INFO, " ECapReg - 0x%016lx\n", ECapReg->Uint64));
>
> DEBUG((DEBUG_INFO, " C - 0x%x\n", ECapReg->Bits.C));
>
> DEBUG((DEBUG_INFO, " QI - 0x%x\n", ECapReg->Bits.QI));
>
> DEBUG((DEBUG_INFO, " DT - 0x%x\n", ECapReg->Bits.DT));
>
> diff --git a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/VtdReg.c
> b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/VtdReg.c
> index 2e252fe5b..03b39d183 100644
> --- a/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/VtdReg.c
> +++ b/Silicon/Intel/IntelSiliconPkg/Feature/VTd/IntelVTdPmrPei/VtdReg.c
> @@ -54,6 +54,7 @@ FlushWriteBuffer (
>
>
> if (CapReg.Bits.RWBF != 0) {
>
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> + Reg32 = (Reg32 & 0x96FFFFFF); // Reset the one-shot bits
>
> MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32 |
> B_GMCD_REG_WBF);
>
> do {
>
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> diff --git
> a/Silicon/Intel/IntelSiliconPkg/Library/IntelVTdPeiDxeLib/IntelVTdPeiDxeLib.c
> b/Silicon/Intel/IntelSiliconPkg/Library/IntelVTdPeiDxeLib/IntelVTdPeiDxeLib.c
> index 3e22c3d92..135e740d6 100644
> ---
> a/Silicon/Intel/IntelSiliconPkg/Library/IntelVTdPeiDxeLib/IntelVTdPeiDxeLib.c
> +++
> b/Silicon/Intel/IntelSiliconPkg/Library/IntelVTdPeiDxeLib/IntelVTdPeiDxeLib.c
> @@ -1497,6 +1497,7 @@ VtdLibFlushWriteBuffer (
>
>
> if (CapReg.Bits.RWBF != 0) {
>
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> + Reg32 = (Reg32 & 0x96FFFFFF); // Reset the one-shot bits
>
> MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32 |
> B_GMCD_REG_WBF);
>
> do {
>
> Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> @@ -1664,7 +1665,6 @@ VtdLibDisableQueuedInvalidationInterface (
> IN UINTN VtdUnitBaseAddress
>
> )
>
> {
>
> - UINT32 Reg32;
>
> QI_256_DESC QiDesc;
>
>
>
> QiDesc.Uint64[0] = QI_IWD_TYPE;
>
> @@ -1674,14 +1674,8 @@ VtdLibDisableQueuedInvalidationInterface (
>
>
> VtdLibSubmitQueuedInvalidationDescriptor (VtdUnitBaseAddress, &QiDesc,
> TRUE);
>
>
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - Reg32 &= (~B_GMCD_REG_QIE);
>
> - MmioWrite32 (VtdUnitBaseAddress + R_GCMD_REG, Reg32);
>
> -
>
> - DEBUG ((DEBUG_INFO, "Disable Queued Invalidation Interface. [%x]
> GCMD_REG = 0x%x\n", VtdUnitBaseAddress, Reg32));
>
> - do {
>
> - Reg32 = MmioRead32 (VtdUnitBaseAddress + R_GSTS_REG);
>
> - } while ((Reg32 & B_GSTS_REG_QIES) != 0);
>
> + DEBUG ((DEBUG_INFO, "Disable Queued Invalidation Interface. [%x]\n",
> VtdUnitBaseAddress));
>
> + VtdLibClearGlobalCommandRegisterBits (VtdUnitBaseAddress,
> B_GMCD_REG_QIE);
>
>
>
> MmioWrite64 (VtdUnitBaseAddress + R_IQA_REG, 0);
>
> }
>
> --
> 2.26.2.windows.1
>
>
>
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