[edk2-devel] [PATCH] MdeModulePkg/RamDiskDxe: RamDisk driver to assign non-zero SPA range index
Wu, Hao A
hao.a.wu at intel.com
Tue Jun 29 00:31:03 UTC 2021
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Wu, Hao A
> Sent: Tuesday, June 29, 2021 8:24 AM
> To: devel at edk2.groups.io; Bassa, Damian <damian.bassa at intel.com>
> Cc: Rusocki, Krzysztof <krzysztof.rusocki at intel.com>
> Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/RamDiskDxe: RamDisk driver
> to assign non-zero SPA range index
>
> > -----Original Message-----
> > From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Bassa,
> > Damian
> > Sent: Tuesday, June 29, 2021 2:22 AM
> > To: devel at edk2.groups.io
> > Cc: Rusocki, Krzysztof <krzysztof.rusocki at intel.com>
> > Subject: [edk2-devel] [PATCH] MdeModulePkg/RamDiskDxe: RamDisk driver
> > to assign non-zero SPA range index
> >
> > Driver should not use default zero value to assign SPA range since it
> > is invalid value according to ACPI spec.
> > After the change driver will look for highest index existing in the table.
> > If maximum number is already taken it will look for holes in table.
>
>
> Hello Damian Bassa,
>
> Thanks a lot for the patch.
>
> The reason the current implementation leave the 'SPARangeStructureIndex' field
> as value 0 for RamDisk is that in Section 5.2.25.2 of the ACPI 6.1 specification
> (also applies for ACPI 6.3):
Fix a typo: "also applies for ACPI 6.4"
Best Regards,
Hao Wu
>
> |> For Virtual CD Region and Virtual Disk Region (both volatile and
> |> persistent), the following fields - Proximity Domain, SPA Range
> |> Structure Index, Flags, and Address Range Memory Mapping Attribute, are
> not relevant and shall be set to 0.
>
> Assigning a non-zero value proposed in this patch seems not following the above
> statement.
>
> Best Regards,
> Hao Wu
>
>
> >
> > Signed-off-by: Damian Bassa <damian.bassa at intel.com>
> > ---
> > .../Disk/RamDiskDxe/RamDiskProtocol.c | 131 ++++++++++++++++++
> > 1 file changed, 131 insertions(+)
> >
> > diff --git a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskProtocol.c
> > b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskProtocol.c
> > index 4333e00053..b47e3af929 100644
> > --- a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskProtocol.c
> > +++ b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskProtocol.c
> > @@ -116,6 +116,136 @@ RamDiskPublishSsdt (
> > return Status;
> > }
> >
> > +/**
> > + Finds highest Spa Range Index in Nfit table.
> > +
> > + @param[in] TableHeader Points to Nfit table.
> > +
> > + @retval Index Highest Spa range index
> > + @retval 0 Free index not found
> > +**/
> > +UINT16
> > +GetHighestSpaRangeIndex (
> > + VOID *TableHeader
> > + )
> > +{
> > + INT32 Length;
> > + UINT16 HighestIndex;
> > +
> > + HighestIndex = 0;
> > +
> > + EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER *NfitStructHeader;
> > + EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE
> > *SpaRange;
> > +
> > + Length = ((EFI_ACPI_DESCRIPTION_HEADER *)TableHeader)->Length -
> > + sizeof (EFI_ACPI_6_1_NVDIMM_FIRMWARE_INTERFACE_TABLE);
> > + NfitStructHeader = (EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER *)
> > + ((UINT8 *)TableHeader + sizeof
> > + (EFI_ACPI_6_1_NVDIMM_FIRMWARE_INTERFACE_TABLE));
> > +
> > + while (Length > sizeof(EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER)) {
> > + if (NfitStructHeader->Length <
> > sizeof(EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER)) {
> > + break;
> > + }
> > + if ((NfitStructHeader->Type ==
> > EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE_TYPE)
> > &&
> > + (NfitStructHeader->Length >= sizeof
> > (EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE))) {
> > + SpaRange =
> > (EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE
> > *)NfitStructHeader;
> > + if (SpaRange->SPARangeStructureIndex > HighestIndex) {
> > + HighestIndex = SpaRange->SPARangeStructureIndex;
> > + }
> > + }
> > +
> > + //
> > + // Move to the header of next NFIT structure.
> > + //
> > + Length -= NfitStructHeader->Length;
> > + NfitStructHeader = (EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER *)
> > + ((UINT8 *)NfitStructHeader +
> > +NfitStructHeader->Length);
> > + }
> > + return HighestIndex;
> > +}
> > +
> > +/**
> > + Finds if Spa range index exists in Nfit table.
> > +
> > + @param[in] SpaRangeIndex Number of index to look for.
> > + @param[in] TableHeader Points to Nfit table.
> > +
> > + @retval TRUE Index number already exists in the table
> > + @retval FALSE Index number doesn't exist in the table
> > +**/
> > +BOOLEAN
> > +DoesSpaIndexExist (
> > + UINT16 SpaRangeIndex,
> > + VOID *TableHeader
> > + )
> > +{
> > + INT32 Length;
> > + EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER *NfitStructHeader;
> > + EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE
> > *SpaRange;
> > +
> > + Length = ((EFI_ACPI_DESCRIPTION_HEADER *)TableHeader)->Length - +
> > + sizeof (EFI_ACPI_6_1_NVDIMM_FIRMWARE_INTERFACE_TABLE);
> > + NfitStructHeader = (EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER *)
> > + ((UINT8 *)TableHeader + sizeof
> > + (EFI_ACPI_6_1_NVDIMM_FIRMWARE_INTERFACE_TABLE));
> > +
> > + while (Length > sizeof(EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER)) {
> > + if (NfitStructHeader->Length <
> > sizeof(EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER)) {
> > + break;
> > + }
> > + if ((NfitStructHeader->Type ==
> > EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE_TYPE)
> > &&
> > + (NfitStructHeader->Length >= sizeof
> > (EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE))) {
> > + SpaRange =
> > (EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE
> > *)NfitStructHeader;
> > + if (SpaRange->SPARangeStructureIndex == SpaRangeIndex) {
> > + return TRUE;
> > + }
> > + }
> > +
> > + //
> > + // Move to the header of next NFIT structure.
> > + //
> > + Length -= NfitStructHeader->Length;
> > + NfitStructHeader = (EFI_ACPI_6_1_NFIT_STRUCTURE_HEADER *)
> > + ((UINT8 *)NfitStructHeader +
> > +NfitStructHeader->Length);
> > + }
> > + return FALSE;
> > +}
> > +
> > +/**
> > + Finds lowest available Spa range index in Nfit table.
> > +
> > + @param[in] TableHeader Points to Nfit table.
> > +
> > + @retval Index Lowest free Spa range index
> > + @retval 0 Free index not found
> > +**/
> > +UINT16
> > +GetFreeSpaIndex (
> > + VOID *TableHeader
> > + )
> > +{
> > + UINT16 Index;
> > +
> > + Index = GetHighestSpaRangeIndex (TableHeader);
> > +
> > + //
> > + // If highest range found is not maximum allowed number use value
> > +increased by 1
> > + //
> > + if (Index != MAX_UINT16) {
> > + return Index + 1;
> > + }
> > + //
> > + // If highest possible index value is already used, see if there is
> > +any that is not taken
> > + //
> > + for (Index = 1; Index < MAX_UINT16; Index++)
> > + {
> > + if (!DoesSpaIndexExist(Index, TableHeader)) {
> > + return Index;
> > + }
> > + }
> > + DEBUG ((
> > + EFI_D_ERROR,
> > + "GetFreeSpaIndex: Nfit index not found, table is full\n"
> > + ));
> > + return 0;
> > +}
> >
> > /**
> > Publish the RAM disk NVDIMM Firmware Interface Table (NFIT) to the
> > ACPI @@ -334,6 +464,7 @@ RamDiskPublishNfit (
> > SpaRange->Length = sizeof
> > (EFI_ACPI_6_1_NFIT_SYSTEM_PHYSICAL_ADDRESS_RANGE_STRUCTURE);
> > SpaRange->SystemPhysicalAddressRangeBase = PrivateData->StartingAddr;
> > SpaRange->SystemPhysicalAddressRangeLength = PrivateData->Size;
> > + SpaRange->SPARangeStructureIndex = GetFreeSpaIndex (Nfit);
> > CopyGuid (&SpaRange->AddressRangeTypeGUID, &PrivateData->TypeGuid);
> >
> > Checksum = CalculateCheckSum8((UINT8 *)Nfit, NfitHeader->Length);
> > --
> > 2.27.0.windows.1
> >
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