path: root/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Mpam/MpamParser.c

/** @file
  MPAM table parser

  Copyright (c) 2024, Arm Limited. All rights reserved.
  SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Specification Reference:
   - [1] ACPI for Memory System Resource Partitioning and Monitoring 2.0
     (https://developer.arm.com/documentation/den0065/latest)

  @par Glossary:
    - MPAM - Memory System Resource Partitioning And Monitoring
    - MSC  - Memory System Component
    - PCC  - Platform Communication Channel
    - RIS  - Resource Instance Selection
    - SMMU - Arm System Memory Management Unit
 **/

#include <IndustryStandard/Mpam.h>
#include <Library/PrintLib.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiView.h"
#include "AcpiViewConfig.h"

// Local variables
STATIC CONST UINT8                   *MscInterfaceType;
STATIC CONST UINT8                   *ResourceLocatorType;
STATIC UINT32                        MpamMscNodeStart;
STATIC CONST UINT16                  *MpamMscNodeLength;
STATIC CONST UINT32                  *NumberOfMscResources;
STATIC CONST UINT32                  *NumberOfFunctionalDependencies;
STATIC CONST UINT32                  *NumberOfInterconnectDescriptors;
STATIC CONST UINT64                  *InterconnectTableOffset;
STATIC ACPI_DESCRIPTION_HEADER_INFO  AcpiHdrInfo;

// Array of locator type names. New types should be added keeping the order
// preserved as locator type is used to index into the array while parsing.
STATIC CONST CHAR16  *MpamMscLocatorTitles[] = {
  L"Processor cache",
  L"Memory",
  L"SMMU",
  L"Memory cache",
  L"ACPI device",
  L"Interconnect"
};

/**
  When the length of the table is insufficient to be parsed, this function could
  be used to display an appropriate error message.

  @param [in] ErrorMsg      Error message string that has to be appended to the
                            main error log. This string could explain the reason
                            why a insufficient length error was encountered in
                            the first place.
**/
STATIC
VOID
EFIAPI
MpamLengthError (
  IN CONST CHAR16  *ErrorMsg
  )
{
  IncrementErrorCount ();
  Print (L"\nERROR : ");
  Print (ErrorMsg);
  Print (
    L"\nError : Insufficient MPAM MSC Node length. Table length : %u.\n",
    *(AcpiHdrInfo.Length)
    );
}

/**
  This function validates the MMIO size within the MSC node body for MPAM ACPI
  table. MPAM ACPI specification states that the MMIO size for an MSC having PCC
  type interface should be zero.

  @param [in] Ptr        Pointer to the start of the field data.
  @param [in] Length     Length of the field.
  @param [in] Context    Pointer to context specific information. For this
                         function, context holds the parent/double pointer to a
                         variable holding the interface type. Make sure to call
                         the function accordingly.
**/
STATIC
VOID
EFIAPI
ValidateMmioSize (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8   InterfaceType;
  UINT32  MmioSize;

  InterfaceType = *MscInterfaceType;

  if (InterfaceType == EFI_ACPI_MPAM_INTERFACE_PCC) {
    MmioSize = *((UINT32 *)Ptr);

    if (MmioSize > 1) {
      IncrementErrorCount ();
      Print (
        L"\nERROR: MMIO size must be 0 or 1 for PCC interface type. Size - %u\n",
        MmioSize
        );
    }
  }
}

/**
  This function decodes and validates the link type for MPAM's interconnect
  descriptor. Valid links are of NUMA and PROC type.

  @param [in] Ptr         Pointer to the start of the field data.
  @param [in] Length      Length of the field.
  @param [in] Context     Pointer to context specific information. For this
                          function, context is ignored.
**/
STATIC
VOID
EFIAPI
DecodeLinkType (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  LinkType;

  LinkType = *Ptr;

  if (LinkType == EFI_ACPI_MPAM_LINK_TYPE_NUMA) {
    Print (
      L" (NUMA)"
      );
  } else if (LinkType == EFI_ACPI_MPAM_LINK_TYPE_PROC) {
    Print (
      L" (PROC)"
      );
  } else {
    IncrementErrorCount ();
    Print (
      L"\nERROR: Invalid link type - %u\n",
      (UINT32)LinkType
      );
  }
}

/**
  This function decodes the hardware ID field present within MPAM ACPI table.
  The specification states that the hardware ID has to be set to zero if not
  being used.

  @param [in] Ptr         Pointer to the start of the field data.
  @param [in] Length      Length of the field.
  @param [in] Context     Pointer to context specific information. For this
                          function, context is ignored.
**/
STATIC
VOID
EFIAPI
DecodeHardwareId (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT64  HardwareId;

  HardwareId = *((UINT64 *)Ptr);

  if (HardwareId != 0) {
    Print (L" (");
    Dump8Chars (NULL, Ptr, Length);
    Print (L")");
  }
}

/**
  This function decodes and validates the interface type for MPAM. Valid
  interfaces are of MMIO and PCC type.

  @param [in] Ptr         Pointer to the start of the field data.
  @param [in] Length      Length of the field.
  @param [in] Context     Pointer to context specific information. For this
                          function, context is ignored.
**/
STATIC
VOID
EFIAPI
DecodeInterfaceType (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  InterfaceType;

  InterfaceType = *Ptr;

  if (InterfaceType == EFI_ACPI_MPAM_INTERFACE_MMIO) {
    Print (L" (MMIO)");
  } else if (InterfaceType == EFI_ACPI_MPAM_INTERFACE_PCC) {
    Print (L" (PCC)");
  } else {
    IncrementErrorCount ();
    Print (
      L"\nERROR: Invalid interface type - %u\n",
      (UINT32)InterfaceType
      );
  }
}

/**
  This function decodes the interrupt mode flag for MPAM. Interrupt mode could
  either be "edge triggered" or "level triggered".

  @param [in] Ptr        Pointer to the start of the field data.
  @param [in] Length     Length of the field.
  @param [in] Context    Pointer to context specific information. For this
                         function, context holds the parent/double pointer to a
                         variable holding the interrupt gsiv. Make sure to call
                         the function accordingly.
**/
STATIC
VOID
EFIAPI
DecodeInterruptMode (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  InterruptMode;

  InterruptMode = *Ptr;

  if (InterruptMode == EFI_ACPI_MPAM_INTERRUPT_LEVEL_TRIGGERED) {
    Print (L" (Level triggered)");
  } else {
    Print (L" (Edge triggered)");
  }
}

/**
  This function decodes the interrupt type flag for MPAM. Interrupt type could
  be "wired interrupt". Other values are reserved at this point.

  @param [in] Ptr        Pointer to the start of the field data.
  @param [in] Length     Length of the field.
  @param [in] Context    Pointer to context specific information. For this
                         function, context holds the parent/double pointer to a
                         variable holding the interrupt gsiv. Make sure to call
                         the function accordingly.
**/
STATIC
VOID
EFIAPI
DecodeInterruptType (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  InterruptType;

  InterruptType = *Ptr;

  if (InterruptType == EFI_ACPI_MPAM_INTERRUPT_WIRED) {
    Print (L" (Wired interrupt)");
  } else {
    IncrementWarningCount ();
    Print (L" (Reserved value!)");
  }
}

/**
  This function decodes the interrupt affinity valid flag for MPAM. Interrupt
  affinity could be either be valid or not.

  @param [in] Ptr        Pointer to the start of the field data.
  @param [in] Length     Length of the field.
  @param [in] Context    Pointer to context specific information. For this
                         function, context holds the parent/double pointer to a
                         variable holding the interrupt gsiv. Make sure to call
                         the function accordingly.
**/
STATIC
VOID
EFIAPI
DecodeInterruptAffinityValid (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  InterruptAffinityValid;

  InterruptAffinityValid = *Ptr;

  if (InterruptAffinityValid != EFI_ACPI_MPAM_INTERRUPT_AFFINITY_VALID) {
    Print (L" (Affinity not valid)");
  } else {
    Print (L" (Affinity valid)");
  }
}

/**
  This function decodes the interrupt affinity type flag for MPAM. Interrupt
  affinity type could either be "Processor affinity" or "Processor container
  affinity"

  @param [in] Ptr        Pointer to the start of the field data.
  @param [in] Length     Length of the field.
  @param [in] Context    Pointer to context specific information. For this
                         function, context holds the parent/double pointer to a
                         variable holding the interrupt gsiv. Make sure to call
                         the function accordingly.
**/
STATIC
VOID
EFIAPI
DecodeInterruptAffinityType (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  InterruptAffinityType;

  InterruptAffinityType = *Ptr;

  if (InterruptAffinityType == EFI_ACPI_MPAM_INTERRUPT_PROCESSOR_AFFINITY) {
    Print (L" (Processor affinity)");
  } else {
    Print (L" (Processor container affinity)");
  }
}

/**
  This function decodes the locator type for a particular MPAM MSC resource.

  @param [in] Ptr        Pointer to the start of the field data.
  @param [in] Length     Length of the field.
  @param [in] Context    Pointer to context specific information. For this
                         function, context holds the parent/double pointer to a
                         variable holding the interrupt gsiv. Make sure to call
                         the function accordingly.
**/
STATIC
VOID
EFIAPI
DecodeLocatorType (
  IN UINT8   *Ptr,
  IN UINT32  Length,
  IN VOID    *Context
  )
{
  UINT8  LocatorType;

  LocatorType = *Ptr;

  if (LocatorType <= EFI_ACPI_MPAM_LOCATION_INTERCONNECT) {
    Print (L" (%s)", MpamMscLocatorTitles[LocatorType]);
  } else if (LocatorType == EFI_ACPI_MPAM_LOCATION_UNKNOWN) {
    Print (L" (Unknown)");
  } else {
    Print (L" (Reserved)");
  }
}

/**
  ACPI_PARSER array describing MPAM MSC interrupt flags.
**/
STATIC CONST ACPI_PARSER  MpamMscInterruptFlagParser[] = {
  { L"Interrupt Mode", 1,  0, L"%u", NULL,             NULL,
    DecodeInterruptMode, NULL },
  { L"Interrupt Type", 2,  1, L"%u", NULL,             NULL,
    DecodeInterruptType, NULL },
  { L"Affinity Type",  1,  3, L"%u", NULL,             NULL,
    DecodeInterruptAffinityType, NULL },
  { L"Affinity Valid", 1,  4, L"%u", NULL,             NULL,
    DecodeInterruptAffinityValid, NULL },
  { L"Reserved",       27, 5, NULL,  DumpReservedBits, NULL,
    ValidateReservedBits, NULL }
};

/**
  This function traces MPAM MSC Interrupt Flags.
  If no format string is specified the Format must be NULL.

  @param [in] Format  Optional format string for tracing the data.
  @param [in] Ptr     Pointer to the start of the buffer.
  @param [in] Length  Length of the field.
**/
STATIC
VOID
EFIAPI
DumpMpamMscInterruptFlags (
  IN CONST CHAR16  *Format OPTIONAL,
  IN UINT8         *Ptr,
  IN UINT32        Length
  )
{
  Print (L"%u\n", *(UINT32 *)Ptr);

  ParseAcpiBitFields (
    TRUE,
    2,
    NULL,
    Ptr,
    4,
    PARSER_PARAMS (MpamMscInterruptFlagParser)
    );
}

/**
  ACPI_PARSER array describing the MPAM MSC processor cache locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscProcessorCacheLocatorParser[] = {
  { L"Cache reference", 8, 0, L"%lu", NULL,         NULL, NULL, NULL },
  { L"Reserved",        4, 8, NULL,   DumpReserved, NULL,
    ValidateReserved, NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC memory locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscMemoryLocatorParser[] = {
  { L"Proximity domain", 8, 0, L"%lu", NULL,         NULL, NULL, NULL },
  { L"Reserved",         4, 8, NULL,   DumpReserved, NULL,
    ValidateReserved, NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC SMMU locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscSMMULocatorParser[] = {
  { L"SMMU interface", 8, 0, L"%lu", NULL,         NULL, NULL, NULL },
  { L"Reserved",       4, 8, NULL,   DumpReserved, NULL,
    ValidateReserved, NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC memory cache locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscMemoryCacheLocatorParser[] = {
  { L"Reserved",  7, 0, NULL,  DumpReserved, NULL,
    ValidateReserved, NULL },
  { L"Level",     1, 7, L"%u", NULL,         NULL,NULL,  NULL },
  { L"Reference", 4, 8, L"%u", NULL,         NULL,NULL,  NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC ACPI device locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscAcpiDeviceLocatorParser[] = {
  { L"ACPI hardware ID", 8, 0, L"0x%lx", NULL, NULL,
    DecodeHardwareId, NULL },
  { L"ACPI unique ID",   4, 8, L"%u",    NULL, NULL,NULL,NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC interconnect locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscInterconnectLocatorParser[] = {
  { L"Interconnect desc tbl offset", 8, 0, L"%lu", NULL,
    (VOID **)&InterconnectTableOffset, NULL, NULL },
  { L"Reserved",                     4, 8, NULL,   DumpReserved,
    NULL, ValidateReserved, NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC generic resource locator field.
**/
STATIC CONST ACPI_PARSER  MpamMscGenericLocatorParser[] = {
  { L"Descriptor1", 8, 0, L"%lu", NULL, NULL, NULL, NULL },
  { L"Descriptor2", 4, 8, L"%u",  NULL, NULL, NULL, NULL }
};

/**
  This function parses the locator field within the resource node for ACPI MPAM
  table. The parsing is based on the locator type field.

  @param [in] Format  Optional format string for tracing the data.
  @param [in] Ptr     Pointer to the start of the buffer.
  @param [in] Length  Length of the field.
**/
STATIC
VOID
EFIAPI
ParseLocator (
  IN CONST CHAR16  *Format OPTIONAL,
  IN UINT8         *Ptr,
  IN UINT32        Length
  )
{
  Print (L"\n");
  switch (*ResourceLocatorType) {
    case EFI_ACPI_MPAM_LOCATION_PROCESSOR_CACHE:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscProcessorCacheLocatorParser)
        );
      break;
    case EFI_ACPI_MPAM_LOCATION_MEMORY:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscMemoryLocatorParser)
        );
      break;
    case EFI_ACPI_MPAM_LOCATION_SMMU:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscSMMULocatorParser)
        );
      break;
    case EFI_ACPI_MPAM_LOCATION_MEMORY_CACHE:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscMemoryCacheLocatorParser)
        );
      break;
    case EFI_ACPI_MPAM_LOCATION_ACPI_DEVICE:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscAcpiDeviceLocatorParser)
        );
      break;
    case EFI_ACPI_MPAM_LOCATION_INTERCONNECT:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscInterconnectLocatorParser)
        );
      break;
    // For both UNKNOWN and RESERVED locator types, the locator is parsed using
    // the generic locator parser as the spec does not define any format.
    case EFI_ACPI_MPAM_LOCATION_UNKNOWN:
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscGenericLocatorParser)
        );
      break;
    default:
      Print (L"\nWARNING : Reserved locator type\n");
      ParseAcpi (
        TRUE,
        2,
        NULL,
        Ptr,
        12,
        PARSER_PARAMS (MpamMscGenericLocatorParser)
        );
      IncrementWarningCount ();
      break;
  } // switch
}

/**
  ACPI_PARSER array describing the Generic ACPI MPAM table header.
**/
STATIC CONST ACPI_PARSER  MpamParser[] = {
  PARSE_ACPI_HEADER (&AcpiHdrInfo)
};

/**
  ACPI_PARSER array describing the MPAM MSC node object.
**/
STATIC CONST ACPI_PARSER  MpamMscNodeParser[] = {
  { L"Length",                       2, 0,  L"%u",    NULL,
    (VOID **)&MpamMscNodeLength, NULL, NULL },
  // Once Interface type is decoded, the address of interface type field is
  // captured into InterfaceType pointer so that it could be used to check if
  // MMIO Size field is set as per the specification.
  { L"Interface type",               1, 2,  L"0x%x",  NULL,
    (VOID **)&MscInterfaceType, DecodeInterfaceType, NULL },
  { L"Reserved",                     1, 3,  NULL,     DumpReserved,
    NULL, ValidateReserved, NULL },
  { L"Identifier",                   4, 4,  L"%u",    NULL,
    NULL, NULL, NULL },
  { L"Base address",                 8, 8,  L"0x%lx", NULL,
    NULL, NULL, NULL },
  { L"MMIO Size",                    4, 16, L"0x%x",  NULL,
    NULL, ValidateMmioSize, (VOID **)&MscInterfaceType },
  { L"Overflow interrupt",           4, 20, L"%u",    NULL,
    NULL, NULL, NULL },
  { L"Overflow interrupt flags",     4, 24, NULL,     DumpMpamMscInterruptFlags,
    NULL, NULL, NULL },
  { L"Reserved1",                    4, 28, NULL,     DumpReserved,
    NULL, ValidateReserved, NULL },
  { L"Overflow interrupt affinity",  4, 32, L"0x%x",  NULL,
    NULL, NULL, NULL },
  { L"Error interrupt",              4, 36, L"%u",    NULL,
    NULL, NULL, NULL },
  { L"Error interrupt flags",        4, 40, NULL,     DumpMpamMscInterruptFlags,
    NULL, NULL, NULL },
  { L"Reserved2",                    4, 44, NULL,     DumpReserved,
    NULL, ValidateReserved, NULL },
  { L"Error interrupt affinity",     4, 48, L"0x%x",  NULL,
    NULL, NULL, NULL },
  { L"MAX_NRDY_USEC",                4, 52, L"0x%x",  NULL,
    NULL, NULL, NULL },
  { L"Hardware ID of linked device", 8, 56, L"0x%lx", NULL,
    NULL, DecodeHardwareId, NULL },
  { L"Instance ID of linked device", 4, 64, L"0x%x",  NULL,
    NULL, NULL, NULL },
  { L"Number of resource nodes",     4, 68, L"%u",    NULL,
    (VOID **)&NumberOfMscResources, NULL, NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC resource.
**/
STATIC CONST ACPI_PARSER  MpamMscResourceParser[] = {
  { L"Identifier",                  4,  0,  L"%u",   NULL,
    NULL, NULL, NULL },
  { L"RIS index",                   1,  4,  L"%u",   NULL,
    NULL, NULL, NULL },
  { L"Reserved1",                   2,  5,  NULL,    DumpReserved,
    NULL, ValidateReserved, NULL },
  { L"Locator type",                1,  7,  L"0x%x", NULL,
    (VOID **)&ResourceLocatorType,
    DecodeLocatorType, NULL },
  { L"Locator",                     12, 8,  NULL,    ParseLocator,
    NULL, NULL, NULL },
  { L"Number of func dependencies", 4,  20, L"%u",   NULL,
    (VOID **)&NumberOfFunctionalDependencies, NULL, NULL }
};

/**
  ACPI_PARSER array describing the MPAM MSC resource's functional dependencies.
**/
STATIC CONST ACPI_PARSER  MpamMscFunctionalDependencyParser[] = {
  { L"Producer", 4, 0, L"0x%x", NULL,         NULL, NULL, NULL },
  { L"Reserved", 4, 4, NULL,    DumpReserved,
    NULL, ValidateReserved, NULL },
};

/**
  ACPI_PARSER array describing the interconnect descriptor table associated with
  the interconnect locator type.
**/
STATIC CONST ACPI_PARSER  MpamInterconnectDescriptorTableParser[] = {
  { L"Signature",                   16, 0,
    L"%x%x%x%x-%x%x-%x%x-%x%x-%x%x%x%x%x%x", Dump16Chars, NULL, NULL, NULL },
  { L"Number of Interconnect desc", 4,  16,L"0x%x", NULL,
    (VOID **)&NumberOfInterconnectDescriptors, NULL, NULL }
};

/**
  ACPI_PARSER array describing the interconnect descriptor associated with the
  interconnect locator type.
**/
STATIC CONST ACPI_PARSER  MpamInterconnectDescriptorParser[] = {
  { L"Source ID",      4, 0, L"%u",   NULL,         NULL, NULL, NULL },
  { L"Destination ID", 4, 4, L"%u",   NULL,         NULL, NULL, NULL },
  { L"Link type",      1, 8, L"0x%x", NULL,
    NULL, DecodeLinkType, NULL },
  { L"Reserved",       3, 9, NULL,    DumpReserved, NULL,
    ValidateReserved, NULL }
};

/**
  PrintBlockTitle could be used to print the title of blocks that
  appear more than once in the MPAM ACPI table.

  @param [in] Indent              Number of spaces to add to the global table
                                  indent. The global table indent is 0 by
                                  default; however this value is updated on
                                  entry to the ParseAcpi() by adding the indent
                                  value provided to ParseAcpi() and restored
                                  back on exit.  Therefore the total indent in
                                  the output is dependent on from where this
                                  function is called.
  @param [in] Title               Title string to be used for the block.
  @param [in] Index               Index of the block.
**/
STATIC
VOID
EFIAPI
PrintBlockTitle (
  IN UINT32        Indent,
  IN CONST CHAR16  *Title,
  IN CONST UINT32  Index
  )
{
  Print (L"\n");
  PrintFieldName (Indent, Title);
  Print (L"%u\n\n", Index);
}

/**
  This function parses the interconnect descriptor(s) associated with
  an interconnect type locator object.

  @param [in] Ptr                Pointer to the start of the buffer.
  @param [in] AcpiTableLength    Length of the ACPI table.
  @param [in, out] Offset        Pointer to current offset within Ptr.

Returns:

  Status

  EFI_SUCCESS                    MPAM MSC nodes were parsed properly.
  EFI_BAD_BUFFER_SIZE            The buffer pointer provided as input is not
                                 long enough to be parsed correctly.
**/
STATIC
EFI_STATUS
EFIAPI
ParseInterconnectDescriptors (
  IN UINT8   *CONST     Ptr,
  IN CONST UINT32       AcpiTableLength,
  IN OUT UINT32 *CONST  Offset
  )
{
  UINT32  InterconnectDescriptorIndex;

  InterconnectDescriptorIndex = 0;

  if (NumberOfInterconnectDescriptors == NULL) {
    MpamLengthError (L"Number of interconnect descriptors not set!");
    return EFI_BAD_BUFFER_SIZE;
  }

  while (InterconnectDescriptorIndex < *NumberOfInterconnectDescriptors) {
    PrintBlockTitle (
      6,
      L"* Interconnect descriptor *",
      InterconnectDescriptorIndex
      );

    // Parse interconnect descriptor
    *Offset += ParseAcpi (
                 TRUE,
                 4,
                 NULL,
                 Ptr + *Offset,
                 AcpiTableLength - *Offset,
                 PARSER_PARAMS (MpamInterconnectDescriptorParser)
                 );

    InterconnectDescriptorIndex++;
  }

  return EFI_SUCCESS;
}

/**
  This function parses the interconnect descriptor table associated with an
  interconnect type locator object. It also performs necessary validation to
  make sure the interconnect descriptor is at a valid location.

  @param [in] Ptr                Pointer to the start of the buffer.
  @param [in] AcpiTableLength    Length of the ACPI table.
  @param [in] Offset             Pointer to current offset within Ptr.
  @param [in] InterconnectOffset Offset to the interconnect descriptor table.

Returns:

  Status

  EFI_SUCCESS                    MPAM MSC nodes were parsed properly.
  EFI_BAD_BUFFER_SIZE            The buffer pointer provided as input is not
                                 long enough to be parsed correctly.
  EFI_INVALID_PARAMETER          The Offset parameter encoded within the Ptr
                                 buffer is not valid.
**/
STATIC
EFI_STATUS
EFIAPI
ParseInterconnectDescriptorTable (
  IN UINT8   *CONST  Ptr,
  IN CONST UINT32    AcpiTableLength,
  IN UINT32          Offset,
  IN CONST UINT64    InterconnectOffset
  )
{
  EFI_STATUS  Status;

  // Lower bound check
  if (Offset > (MpamMscNodeStart + InterconnectOffset)) {
    IncrementErrorCount ();
    Print (L"\nERROR : Parsing Interconnect descriptor table failed!\n");
    Print (
      L"ERROR : Offset overlaps with other objects within the MSC. Offset %u.\n",
      InterconnectOffset
      );

    return EFI_INVALID_PARAMETER;
  }

  // Upper bound check
  if (InterconnectOffset > (*MpamMscNodeLength)) {
    IncrementErrorCount ();
    Print (L"\nERROR : Parsing Interconnect descriptor table failed!\n");
    Print (
      L"ERROR : Offset falls outside MSC's space. Offset %u.\n",
      InterconnectOffset
      );

    return EFI_INVALID_PARAMETER;
  }

  // It is safe to cast InterconnectOffset to UINT32 as IntercconnectOffset can
  // never exceed the MPAM table length which is at max 2 bytes.
  Offset = MpamMscNodeStart + (UINT32)InterconnectOffset;

  Print (L"\n");
  PrintFieldName (6, L"* Interconnect desc table *");
  Print (L"\n\n");

  // Parse interconnect descriptor table
  Offset += ParseAcpi (
              TRUE,
              4,
              NULL,
              Ptr + Offset,
              AcpiTableLength - Offset,
              PARSER_PARAMS (MpamInterconnectDescriptorTableParser)
              );

  Status = ParseInterconnectDescriptors (
             Ptr,
             AcpiTableLength,
             &Offset
             );

  return Status;
}

/**
  This function parses all the MPAM functional dependency nodes within a
  single resource node.

  @param [in] Ptr                Pointer to the start of the buffer.
  @param [in] AcpiTableLength    Length of the ACPI table.
  @param [in, out] Offset             Pointer to current offset within Ptr.

Returns:

  Status

  EFI_SUCCESS                    MPAM MSC nodes were parsed properly.
  EFI_BAD_BUFFER_SIZE            The buffer pointer provided as input is not
                                 long enough to be parsed correctly.
**/
STATIC
EFI_STATUS
EFIAPI
ParseMpamMscFunctionalDependencies (
  IN UINT8   *CONST      Ptr,
  IN CONST UINT32        AcpiTableLength,
  IN OUT UINT32  *CONST  Offset
  )
{
  UINT32  FunctionalDependencyIndex;

  FunctionalDependencyIndex = 0;

  if (NumberOfFunctionalDependencies == NULL) {
    MpamLengthError (L"Number of functional dependencies not set!");
    return EFI_BAD_BUFFER_SIZE;
  }

  while (FunctionalDependencyIndex < *NumberOfFunctionalDependencies) {
    PrintBlockTitle (
      6,
      L"* Functional dependency *",
      FunctionalDependencyIndex
      );

    // Parse functional dependency
    *Offset += ParseAcpi (
                 TRUE,
                 4,
                 NULL,
                 Ptr + *Offset,
                 AcpiTableLength - *Offset,
                 PARSER_PARAMS (MpamMscFunctionalDependencyParser)
                 );

    FunctionalDependencyIndex++;
  }

  return EFI_SUCCESS;
}

/**
  This function parses all the MPAM resource nodes within a single MSC
  node within the MPAM ACPI table. It also invokes helper functions to
  validate and parse locators and functional dependency descriptors.

  @param [in] Ptr                Pointer to the start of the buffer.
  @param [in] AcpiTableLength    Length of the ACPI table.
  @param [in] Offset             Pointer to current offset within Ptr.

Returns:

  Status

  EFI_SUCCESS                    MPAM MSC nodes were parsed properly.
  EFI_BAD_BUFFER_SIZE            The buffer pointer provided as input is not
                                 long enough to be parsed correctly.
**/
STATIC
EFI_STATUS
EFIAPI
ParseMpamMscResources (
  IN UINT8   *CONST  Ptr,
  IN CONST UINT32    AcpiTableLength,
  IN UINT32          Offset
  )
{
  EFI_STATUS  Status;
  UINT32      ResourceIndex;

  ResourceIndex = 0;

  if (NumberOfMscResources == NULL) {
    MpamLengthError (L"Number of MSC resource not set!");
    return EFI_BAD_BUFFER_SIZE;
  }

  while (ResourceIndex < *NumberOfMscResources) {
    PrintBlockTitle (
      4,
      L"* Resource *",
      ResourceIndex
      );

    // Parse MPAM MSC resources within the MSC body.
    Offset += ParseAcpi (
                TRUE,
                2,
                NULL,
                Ptr + Offset,
                AcpiTableLength - Offset,
                PARSER_PARAMS (MpamMscResourceParser)
                );

    Status = ParseMpamMscFunctionalDependencies (Ptr, AcpiTableLength, &Offset);
    if (Status != EFI_SUCCESS) {
      return Status;
    }

    // If the InterconnectTableOffset field has been set, proceed to parse the
    // interconnect descriptor table. Please note that the interconnect
    // descriptors are placed within the MSC node body in the resource specific
    // region.  However since its easier to map an interconnect descriptor to
    // its corresponding resource, proceed to parse it along with its parent
    // resource. This design choice is made to keep the trace view as intuitive
    // as possible.
    //
    //  +---------------------+
    //  | MPAM ACPI Header    |
    //  +---------------------+-------
    //  |   MSC Node 0 Hdr    |   ^
    //  | +-----------------+ |   |
    //  | | Res Node 0      | |   |
    //  | | +-------------+ | |   |
    //  | | | Res Node Hdr| | |   |
    //  | | +-------------+ | |   |
    //  | | | Res Data    | | |   |
    //  | | |             | | |   |
    //  | | | +---------+ | | |   |  +---------------------------+
    //  | | | | Locator | | | | ..|..| Interconnect locator desc |
    //  | | | |         | | | |   |  |  Descriptor Table Offset  |--points-to->+
    //  | | | |         | | | |   |  |  Reserved [4]             |             |
    //  | | | +---------+ | | |   |  +---------------------------+             |
    //  | | | |FnDep Cnt| | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | | |FnDep 1  | | | |   |                                            |
    //  | | | +---------+ | | | Interconnect                                   |
    //  | | | |FnDep 2  | | | |  descriptor                                    |
    //  | | | +---------+ | | |  table                                         |
    //  | | | |FnDep n  | | | |  offset                                        |
    //  | | | +---------+ | | |  value                                         |
    //  | | +-------------+ | |   |                                            |
    //  | +-----------------+ |   |                                            |
    //  |         ...         |   |                                            |
    //  | +-----------------+ |   |                                            |
    //  | | Res Node N      | |   |                                            |
    //  | | +-------------+ | |   |                                            |
    //  | | | Res Node Hdr| | |   |                                            |
    //  | | +-------------+ | |   |                                            |
    //  | | | Res Data    | | |   |                                            |
    //  | | |             | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | | | Locator | | | |   |                                            |
    //  | | | |         | | | |   |                                            |
    //  | | | |         | | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | | |FnDep Cnt| | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | | |FnDep 1  | | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | | |FnDep 2  | | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | | |FnDep n  | | | |   |                                            |
    //  | | | +---------+ | | |   |                                            |
    //  | | +-------------+ | |   |                                            |
    //  | +-----------------+ |   |                                            |
    //  \  Resource-specific  /   v                                            |
    //  /  data region.       \<-----------------------------------------------+
    //  \                     /
    //  +---------------------+
    //  | MSC Node 1 Hdr      |
    //  |     ...             |
    //  +---------------------+
    if (  (*ResourceLocatorType == EFI_ACPI_MPAM_LOCATION_INTERCONNECT)
       && (InterconnectTableOffset != NULL))
    {
      Status = ParseInterconnectDescriptorTable (
                 Ptr,
                 AcpiTableLength,
                 Offset,
                 *InterconnectTableOffset
                 );
      if (Status != EFI_SUCCESS) {
        return Status;
      }
    }

    ResourceIndex++;
  }

  return EFI_SUCCESS;
}

/**
  This function parses all the MPAM MSC nodes within the MPAM ACPI table.  It
  also invokes a helper function to detect and parse resource nodes that maybe
  present.

  @param [in] Ptr                Pointer to the start of the buffer.
  @param [in] AcpiTableLength    Length of the ACPI table.
  @param [in, out] Offset        Pointer to the current offset within Ptr.

Returns:

  Status

  EFI_SUCCESS                    MPAM MSC nodes were parsed properly.
  EFI_BAD_BUFFER_SIZE            The buffer pointer provided as input is not
                                 long enough to be parsed correctly.
**/
STATIC
EFI_STATUS
EFIAPI
ParseMpamMscNodes (
  IN UINT8   *CONST      Ptr,
  IN CONST UINT32        AcpiTableLength,
  IN OUT UINT32  *CONST  Offset
  )
{
  EFI_STATUS  Status;
  UINT32      MscIndex;

  MscIndex = 0;

  while (*Offset < AcpiTableLength) {
    MpamMscNodeStart = *Offset;

    PrintBlockTitle (2, L"* MSC *", MscIndex);
    // Parse MPAM MSC node
    *Offset +=  ParseAcpi (
                  TRUE,
                  0,
                  NULL,
                  Ptr + *Offset,
                  AcpiTableLength - *Offset,
                  PARSER_PARAMS (MpamMscNodeParser)
                  );

    if (MpamMscNodeLength == NULL) {
      MpamLengthError (L"MPAM MSC node length not set!");
      return EFI_BAD_BUFFER_SIZE;
    }

    if (*MpamMscNodeLength < sizeof (EFI_ACPI_MPAM_MSC_NODE)) {
      IncrementErrorCount ();
      Print (L"\nERROR: MSC length should be at least the size of node body! ");
      Print (L"MSC Length %u\n", *MpamMscNodeLength);
      return EFI_BAD_BUFFER_SIZE;
    }

    // Parse MPAM MSC resources within the MSC body
    Status = ParseMpamMscResources (Ptr, AcpiTableLength, *Offset);
    if (Status != EFI_SUCCESS) {
      return Status;
    }

    *Offset = MpamMscNodeStart + *MpamMscNodeLength;
    MscIndex++;
  }

  return EFI_SUCCESS;
}

/**
  This function parses the MPAM ACPI table's generic header. It also invokes a
  sub routine that would help with parsing rest of the table.

  @param [in] Trace              If TRUE, trace the ACPI fields.
  @param [in] Ptr                Pointer to the start of the buffer.
  @param [in] AcpiTableLength    Length of the ACPI table.
  @param [in] AcpiTableRevision  Revision of the ACPI table.
**/
VOID
EFIAPI
ParseAcpiMpam (
  IN BOOLEAN  Trace,
  IN UINT8    *Ptr,
  IN UINT32   AcpiTableLength,
  IN UINT8    AcpiTableRevision
  )
{
  EFI_STATUS  Status;
  UINT32      Offset;

  if (!Trace) {
    return;
  }

  // Parse generic table header
  Offset = ParseAcpi (
             TRUE,
             0,
             "MPAM",
             Ptr,
             AcpiTableLength,
             PARSER_PARAMS (MpamParser)
             );

  Status = ParseMpamMscNodes (
             Ptr,
             AcpiTableLength,
             &Offset
             );

  if (Status == EFI_SUCCESS) {
    // Check if the length of all MPAM MSCs with the header, matches with the
    // ACPI table's length field.
    if (*(AcpiHdrInfo.Length) != Offset) {
      IncrementErrorCount ();
      Print (L"\nERROR: Length mismatch! : ");
      Print (L"MSC Length total != MPAM table length.");
      Print (
        L"Table length : %u MSC total : %u\n",
        *(AcpiHdrInfo.Length),
        Offset
        );
    }
  }
}