system76-edk2/MdeModulePkg/Include/Ppi/IoMmu.h

/** @file
  PEI IOMMU PPI.

Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/


#ifndef __PEI_IOMMU_H__
#define __PEI_IOMMU_H__

//
// for EFI_ALLOCATE_TYPE
//
#include <Uefi.h>

//
// Include protocol for common definition
//   EDKII_IOMMU_ACCESS_xxx
//   EDKII_IOMMU_OPERATION
//
#include <Protocol/IoMmu.h>

//
// IOMMU Ppi GUID value
//
#define EDKII_IOMMU_PPI_GUID \
    { \
      0x70b0af26, 0xf847, 0x4bb6, { 0xaa, 0xb9, 0xcd, 0xe8, 0x4f, 0xc6, 0x14, 0x31 } \
    }

//
// Forward reference for pure ANSI compatability
//
typedef struct _EDKII_IOMMU_PPI  EDKII_IOMMU_PPI;

//
// Revision The revision to which the IOMMU interface adheres.
//          All future revisions must be backwards compatible.
//          If a future version is not back wards compatible it is not the same GUID.
//
#define EDKII_IOMMU_PPI_REVISION 0x00010000

/**
  Set IOMMU attribute for a system memory.

  If the IOMMU PPI exists, the system memory cannot be used
  for DMA by default.

  When a device requests a DMA access for a system memory,
  the device driver need use SetAttribute() to update the IOMMU
  attribute to request DMA access (read and/or write).

  @param[in]  This              The PPI instance pointer.
  @param[in]  Mapping           The mapping value returned from Map().
  @param[in]  IoMmuAccess       The IOMMU access.

  @retval EFI_SUCCESS            The IoMmuAccess is set for the memory range specified by DeviceAddress and Length.
  @retval EFI_INVALID_PARAMETER  Mapping is not a value that was returned by Map().
  @retval EFI_INVALID_PARAMETER  IoMmuAccess specified an illegal combination of access.
  @retval EFI_UNSUPPORTED        The bit mask of IoMmuAccess is not supported by the IOMMU.
  @retval EFI_UNSUPPORTED        The IOMMU does not support the memory range specified by Mapping.
  @retval EFI_OUT_OF_RESOURCES   There are not enough resources available to modify the IOMMU access.
  @retval EFI_DEVICE_ERROR       The IOMMU device reported an error while attempting the operation.
  @retval EFI_NOT_AVAILABLE_YET  DMA protection has been enabled, but DMA buffer are
                                 not available to be allocated yet.

**/
typedef
EFI_STATUS
(EFIAPI *EDKII_PEI_IOMMU_SET_ATTRIBUTE)(
  IN EDKII_IOMMU_PPI       *This,
  IN VOID                  *Mapping,
  IN UINT64                IoMmuAccess
  );

/**
  Provides the controller-specific addresses required to access system memory from a
  DMA bus master.

  @param  This                  The PPI instance pointer.
  @param  Operation             Indicates if the bus master is going to read or write to system memory.
  @param  HostAddress           The system memory address to map to the PCI controller.
  @param  NumberOfBytes         On input the number of bytes to map. On output the number of bytes
                                that were mapped.
  @param  DeviceAddress         The resulting map address for the bus master PCI controller to use to
                                access the hosts HostAddress.
  @param  Mapping               A resulting value to pass to Unmap().

  @retval EFI_SUCCESS           The range was mapped for the returned NumberOfBytes.
  @retval EFI_UNSUPPORTED       The HostAddress cannot be mapped as a common buffer.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
  @retval EFI_OUT_OF_RESOURCES  The request could not be completed due to a lack of resources.
  @retval EFI_DEVICE_ERROR      The system hardware could not map the requested address.
  @retval EFI_NOT_AVAILABLE_YET DMA protection has been enabled, but DMA buffer are
                                not available to be allocated yet.

**/
typedef
EFI_STATUS
(EFIAPI *EDKII_PEI_IOMMU_MAP)(
  IN     EDKII_IOMMU_PPI                            *This,
  IN     EDKII_IOMMU_OPERATION                      Operation,
  IN     VOID                                       *HostAddress,
  IN OUT UINTN                                      *NumberOfBytes,
  OUT    EFI_PHYSICAL_ADDRESS                       *DeviceAddress,
  OUT    VOID                                       **Mapping
  );

/**
  Completes the Map() operation and releases any corresponding resources.

  @param  This                  The PPI instance pointer.
  @param  Mapping               The mapping value returned from Map().

  @retval EFI_SUCCESS           The range was unmapped.
  @retval EFI_INVALID_PARAMETER Mapping is not a value that was returned by Map().
  @retval EFI_DEVICE_ERROR      The data was not committed to the target system memory.
  @retval EFI_NOT_AVAILABLE_YET DMA protection has been enabled, but DMA buffer are
                                not available to be allocated yet.

**/
typedef
EFI_STATUS
(EFIAPI *EDKII_PEI_IOMMU_UNMAP)(
  IN  EDKII_IOMMU_PPI                          *This,
  IN  VOID                                     *Mapping
  );

/**
  Allocates pages that are suitable for an OperationBusMasterCommonBuffer or
  OperationBusMasterCommonBuffer64 mapping.

  @param  This                  The PPI instance pointer.
  @param  MemoryType            The type of memory to allocate, EfiBootServicesData or
                                EfiRuntimeServicesData.
  @param  Pages                 The number of pages to allocate.
  @param  HostAddress           A pointer to store the base system memory address of the
                                allocated range.
  @param  Attributes            The requested bit mask of attributes for the allocated range.

  @retval EFI_SUCCESS           The requested memory pages were allocated.
  @retval EFI_UNSUPPORTED       Attributes is unsupported. The only legal attribute bits are
                                MEMORY_WRITE_COMBINE, MEMORY_CACHED and DUAL_ADDRESS_CYCLE.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
  @retval EFI_OUT_OF_RESOURCES  The memory pages could not be allocated.
  @retval EFI_NOT_AVAILABLE_YET DMA protection has been enabled, but DMA buffer are
                                not available to be allocated yet.

**/
typedef
EFI_STATUS
(EFIAPI *EDKII_PEI_IOMMU_ALLOCATE_BUFFER)(
  IN     EDKII_IOMMU_PPI                          *This,
  IN     EFI_MEMORY_TYPE                          MemoryType,
  IN     UINTN                                    Pages,
  IN OUT VOID                                     **HostAddress,
  IN     UINT64                                   Attributes
  );

/**
  Frees memory that was allocated with AllocateBuffer().

  @param  This                  The PPI instance pointer.
  @param  Pages                 The number of pages to free.
  @param  HostAddress           The base system memory address of the allocated range.

  @retval EFI_SUCCESS           The requested memory pages were freed.
  @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and Pages
                                was not allocated with AllocateBuffer().
  @retval EFI_NOT_AVAILABLE_YET DMA protection has been enabled, but DMA buffer are
                                not available to be allocated yet.

**/
typedef
EFI_STATUS
(EFIAPI *EDKII_PEI_IOMMU_FREE_BUFFER)(
  IN  EDKII_IOMMU_PPI                          *This,
  IN  UINTN                                    Pages,
  IN  VOID                                     *HostAddress
  );

///
/// IOMMU PPI structure.
///
struct _EDKII_IOMMU_PPI {
  UINT64                              Revision;
  EDKII_PEI_IOMMU_SET_ATTRIBUTE       SetAttribute;
  EDKII_PEI_IOMMU_MAP                 Map;
  EDKII_PEI_IOMMU_UNMAP               Unmap;
  EDKII_PEI_IOMMU_ALLOCATE_BUFFER     AllocateBuffer;
  EDKII_PEI_IOMMU_FREE_BUFFER         FreeBuffer;
};

///
/// IOMMU PPI GUID variable.
///
extern EFI_GUID gEdkiiIoMmuPpiGuid;

#endif