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/** @file
Copyright (c) 2019, Linaro, Ltd. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiDxe.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/DmaLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/IoMmu.h>
/**
Set IOMMU attribute for a system memory.
If the IOMMU protocol 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).
The DeviceHandle is used to identify which device submits the request.
The IOMMU implementation need translate the device path to an IOMMU device
ID, and set IOMMU hardware register accordingly.
1) DeviceHandle can be a standard PCI device.
The memory for BusMasterRead need set EDKII_IOMMU_ACCESS_READ.
The memory for BusMasterWrite need set EDKII_IOMMU_ACCESS_WRITE.
The memory for BusMasterCommonBuffer need set
EDKII_IOMMU_ACCESS_READ|EDKII_IOMMU_ACCESS_WRITE.
After the memory is used, the memory need set 0 to keep it being
protected.
2) DeviceHandle can be an ACPI device (ISA, I2C, SPI, etc).
The memory for DMA access need set EDKII_IOMMU_ACCESS_READ and/or
EDKII_IOMMU_ACCESS_WRITE.
@param[in] This The protocol instance pointer.
@param[in] DeviceHandle The device who initiates the DMA access
request.
@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 DeviceHandle is an invalid handle.
@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 DeviceHandle is unknown by the IOMMU.
@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.
**/
STATIC
EFI_STATUS
EFIAPI
NonCoherentIoMmuSetAttribute (
IN EDKII_IOMMU_PROTOCOL *This,
IN EFI_HANDLE DeviceHandle,
IN VOID *Mapping,
IN UINT64 IoMmuAccess
)
{
return EFI_UNSUPPORTED;
}
/**
Provides the controller-specific addresses required to access system memory
from a DMA bus master. On SEV guest, the DMA operations must be performed on
shared buffer hence we allocate a bounce buffer to map the HostAddress to a
DeviceAddress. The Encryption attribute is removed from the DeviceAddress
buffer.
@param This The protocol 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.
**/
STATIC
EFI_STATUS
EFIAPI
NonCoherentIoMmuMap (
IN EDKII_IOMMU_PROTOCOL *This,
IN EDKII_IOMMU_OPERATION Operation,
IN VOID *HostAddress,
IN OUT UINTN *NumberOfBytes,
OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
OUT VOID **Mapping
)
{
DMA_MAP_OPERATION DmaOperation;
switch (Operation) {
case EdkiiIoMmuOperationBusMasterRead:
case EdkiiIoMmuOperationBusMasterRead64:
DmaOperation = MapOperationBusMasterRead;
break;
case EdkiiIoMmuOperationBusMasterWrite:
case EdkiiIoMmuOperationBusMasterWrite64:
DmaOperation = MapOperationBusMasterWrite;
break;
case EdkiiIoMmuOperationBusMasterCommonBuffer:
case EdkiiIoMmuOperationBusMasterCommonBuffer64:
DmaOperation = MapOperationBusMasterCommonBuffer;
break;
default:
ASSERT (FALSE);
return EFI_INVALID_PARAMETER;
}
return DmaMap (DmaOperation, HostAddress, NumberOfBytes,
DeviceAddress, Mapping);
}
/**
Completes the Map() operation and releases any corresponding resources.
@param This The protocol 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.
**/
STATIC
EFI_STATUS
EFIAPI
NonCoherentIoMmuUnmap (
IN EDKII_IOMMU_PROTOCOL *This,
IN VOID *Mapping
)
{
return DmaUnmap (Mapping);
}
/**
Allocates pages that are suitable for an OperationBusMasterCommonBuffer or
OperationBusMasterCommonBuffer64 mapping.
@param This The protocol instance pointer.
@param Type This parameter is not used and must be ignored.
@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 and
MEMORY_CACHED.
@retval EFI_INVALID_PARAMETER One or more parameters are invalid.
@retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.
**/
STATIC
EFI_STATUS
EFIAPI
NonCoherentIoMmuAllocateBuffer (
IN EDKII_IOMMU_PROTOCOL *This,
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN Pages,
IN OUT VOID **HostAddress,
IN UINT64 Attributes
)
{
return DmaAllocateBuffer (MemoryType, Pages, HostAddress);
}
/**
Frees memory that was allocated with AllocateBuffer().
@param This The protocol 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().
**/
STATIC
EFI_STATUS
EFIAPI
NonCoherentIoMmuFreeBuffer (
IN EDKII_IOMMU_PROTOCOL *This,
IN UINTN Pages,
IN VOID *HostAddress
)
{
return DmaFreeBuffer (Pages, HostAddress);
}
STATIC EDKII_IOMMU_PROTOCOL mNonCoherentIoMmuOps = {
EDKII_IOMMU_PROTOCOL_REVISION,
NonCoherentIoMmuSetAttribute,
NonCoherentIoMmuMap,
NonCoherentIoMmuUnmap,
NonCoherentIoMmuAllocateBuffer,
NonCoherentIoMmuFreeBuffer,
};
EFI_STATUS
EFIAPI
NonCoherentIoMmuDxeEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return gBS->InstallMultipleProtocolInterfaces (&ImageHandle,
&gEdkiiIoMmuProtocolGuid, &mNonCoherentIoMmuOps,
NULL);
}
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