/** @file
  This module collects performance data for MM driver boot records and S3 Suspend Performance Record.

  This module registers report status code listener to collect performance data
  for MM driver boot records and S3 Suspend Performance Record.

  Caution: This module requires additional review when modified.
  This driver will have external input - communicate buffer in MM mode.
  This external input must be validated carefully to avoid security issue like
  buffer overflow, integer overflow.

  FpdtSmiHandler() will receive untrusted input and do basic validation.

  Copyright (c) 2011 - 2021, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <PiMm.h>

#include <Protocol/MmReportStatusCodeHandler.h>

#include <Guid/FirmwarePerformance.h>

#include <Library/MmServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/TimerLib.h>
#include <Library/LockBoxLib.h>
#include <Library/PcdLib.h>
#include <Library/BaseMemoryLib.h>
#include "FirmwarePerformanceCommon.h"

EFI_MM_RSC_HANDLER_PROTOCOL  *mRscHandlerProtocol   = NULL;
UINT64                       mSuspendStartTime      = 0;
BOOLEAN                      mS3SuspendLockBoxSaved = FALSE;

/**
  Report status code listener for MM. This is used to record the performance
  data for S3 Suspend Start and S3 Suspend End in FPDT.

  @param[in]  CodeType            Indicates the type of status code being reported.
  @param[in]  Value               Describes the current status of a hardware or software entity.
                                  This included information about the class and subclass that is used to
                                  classify the entity as well as an operation.
  @param[in]  Instance            The enumeration of a hardware or software entity within
                                  the system. Valid instance numbers start with 1.
  @param[in]  CallerId            This optional parameter may be used to identify the caller.
                                  This parameter allows the status code driver to apply different rules to
                                  different callers.
  @param[in]  Data                This optional parameter may be used to pass additional data.

  @retval EFI_SUCCESS             Status code is what we expected.
  @retval EFI_UNSUPPORTED         Status code not supported.

**/
EFI_STATUS
EFIAPI
FpdtStatusCodeListenerMm (
  IN EFI_STATUS_CODE_TYPE   CodeType,
  IN EFI_STATUS_CODE_VALUE  Value,
  IN UINT32                 Instance,
  IN EFI_GUID               *CallerId,
  IN EFI_STATUS_CODE_DATA   *Data
  )
{
  EFI_STATUS                           Status;
  UINT64                               CurrentTime;
  EFI_ACPI_5_0_FPDT_S3_SUSPEND_RECORD  S3SuspendRecord;

  //
  // Check whether status code is what we are interested in.
  //
  if ((CodeType & EFI_STATUS_CODE_TYPE_MASK) != EFI_PROGRESS_CODE) {
    return EFI_UNSUPPORTED;
  }

  if ((Data != NULL) && CompareGuid (&Data->Type, &gEfiFirmwarePerformanceGuid)) {
    DEBUG ((DEBUG_ERROR, "FpdtStatusCodeListenerMm: Performance data reported through gEfiFirmwarePerformanceGuid will not be collected by FirmwarePerformanceDataTableMm\n"));
    return EFI_UNSUPPORTED;
  }

  if ((Value != PcdGet32 (PcdProgressCodeS3SuspendStart)) &&
      (Value != PcdGet32 (PcdProgressCodeS3SuspendEnd)))
  {
    return EFI_UNSUPPORTED;
  }

  //
  // Retrieve current time.
  //
  CurrentTime = GetTimeInNanoSecond (GetPerformanceCounter ());

  if (Value == PcdGet32 (PcdProgressCodeS3SuspendStart)) {
    //
    // S3 Suspend started, record the performance data and return.
    //
    mSuspendStartTime = CurrentTime;
    return EFI_SUCCESS;
  }

  //
  // We are going to S3 sleep, record S3 Suspend End performance data.
  //
  S3SuspendRecord.SuspendStart = mSuspendStartTime;
  S3SuspendRecord.SuspendEnd   = CurrentTime;

  //
  // Save S3 suspend performance data to lock box, it will be used by Firmware Performance PEIM.
  //
  if (!mS3SuspendLockBoxSaved) {
    Status = SaveLockBox (
               &gEfiFirmwarePerformanceGuid,
               &S3SuspendRecord,
               sizeof (EFI_ACPI_5_0_FPDT_S3_SUSPEND_RECORD)
               );
    ASSERT_EFI_ERROR (Status);

    mS3SuspendLockBoxSaved = TRUE;
  } else {
    Status = UpdateLockBox (
               &gEfiFirmwarePerformanceGuid,
               0,
               &S3SuspendRecord,
               sizeof (EFI_ACPI_5_0_FPDT_S3_SUSPEND_RECORD)
               );
    ASSERT_EFI_ERROR (Status);
  }

  return EFI_SUCCESS;
}

/**
  The module Entry Point of the Firmware Performance Data Table MM driver.

  @retval EFI_SUCCESS    The entry point is executed successfully.
  @retval Other          Some error occurs when executing this entry point.

**/
EFI_STATUS
FirmwarePerformanceCommonEntryPoint (
  VOID
  )
{
  EFI_STATUS  Status;

  //
  // Get MM Report Status Code Handler Protocol.
  //
  Status = gMmst->MmLocateProtocol (
                    &gEfiMmRscHandlerProtocolGuid,
                    NULL,
                    (VOID **)&mRscHandlerProtocol
                    );
  ASSERT_EFI_ERROR (Status);

  //
  // Register report status code listener for BootRecords and S3 Suspend Start and End.
  //
  Status = mRscHandlerProtocol->Register (FpdtStatusCodeListenerMm);
  ASSERT_EFI_ERROR (Status);

  return Status;
}