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audk/OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c

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/** @file
This driver produces Virtio Device Protocol instances for Virtio PCI devices.
Copyright (C) 2012, Red Hat, Inc.
Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2013, ARM Ltd.
Copyright (C) 2017, AMD Inc, All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/Pci.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include "VirtioPciDevice.h"
STATIC VIRTIO_DEVICE_PROTOCOL mDeviceProtocolTemplate = {
0, // Revision
0, // SubSystemDeviceId
VirtioPciGetDeviceFeatures, // GetDeviceFeatures
VirtioPciSetGuestFeatures, // SetGuestFeatures
VirtioPciSetQueueAddress, // SetQueueAddress
VirtioPciSetQueueSel, // SetQueueSel
VirtioPciSetQueueNotify, // SetQueueNotify
VirtioPciSetQueueAlignment, // SetQueueAlignment
VirtioPciSetPageSize, // SetPageSize
VirtioPciGetQueueSize, // GetQueueNumMax
VirtioPciSetQueueSize, // SetQueueNum
VirtioPciGetDeviceStatus, // GetDeviceStatus
VirtioPciSetDeviceStatus, // SetDeviceStatus
VirtioPciDeviceWrite, // WriteDevice
VirtioPciDeviceRead, // ReadDevice
VirtioPciAllocateSharedPages, // AllocateSharedPages
VirtioPciFreeSharedPages, // FreeSharedPages
VirtioPciMapSharedBuffer, // MapSharedBuffer
VirtioPciUnmapSharedBuffer, // UnmapSharedBuffer
};
/**
Read a word from Region 0 of the device specified by PciIo.
Region 0 must be an iomem region. This is an internal function for the PCI
implementation of the protocol.
@param[in] Dev Virtio PCI device.
@param[in] FieldOffset Source offset.
@param[in] FieldSize Source field size, must be in { 1, 2, 4, 8 }.
@param[in] BufferSize Number of bytes available in the target buffer. Must
equal FieldSize.
@param[out] Buffer Target buffer.
@return Status code returned by PciIo->Io.Read().
**/
EFI_STATUS
EFIAPI
VirtioPciIoRead (
IN VIRTIO_PCI_DEVICE *Dev,
IN UINTN FieldOffset,
IN UINTN FieldSize,
IN UINTN BufferSize,
OUT VOID *Buffer
)
{
UINTN Count;
EFI_PCI_IO_PROTOCOL_WIDTH Width;
EFI_PCI_IO_PROTOCOL *PciIo;
ASSERT (FieldSize == BufferSize);
PciIo = Dev->PciIo;
Count = 1;
switch (FieldSize) {
case 1:
Width = EfiPciIoWidthUint8;
break;
case 2:
Width = EfiPciIoWidthUint16;
break;
case 8:
//
// The 64bit PCI I/O is broken down into two 32bit reads to prevent
// any alignment or width issues.
// The UEFI spec says under EFI_PCI_IO_PROTOCOL.Io.Write():
//
// The I/O operations are carried out exactly as requested. The caller
// is responsible for any alignment and I/O width issues which the
// bus, device, platform, or type of I/O might require. For example on
// some platforms, width requests of EfiPciIoWidthUint64 do not work.
//
Count = 2;
//
// fall through
//
case 4:
Width = EfiPciIoWidthUint32;
break;
default:
ASSERT (FALSE);
return EFI_INVALID_PARAMETER;
}
return PciIo->Io.Read (
PciIo,
Width,
PCI_BAR_IDX0,
FieldOffset,
Count,
Buffer
);
}
/**
Write a word into Region 0 of the device specified by PciIo.
Region 0 must be an iomem region. This is an internal function for the PCI
implementation of the protocol.
@param[in] Dev Virtio PCI device.
@param[in] FieldOffset Destination offset.
@param[in] FieldSize Destination field size, must be in { 1, 2, 4, 8 }.
@param[in] Value Little endian value to write, converted to UINT64.
The least significant FieldSize bytes will be used.
@return Status code returned by PciIo->Io.Write().
**/
EFI_STATUS
EFIAPI
VirtioPciIoWrite (
IN VIRTIO_PCI_DEVICE *Dev,
IN UINTN FieldOffset,
IN UINTN FieldSize,
IN UINT64 Value
)
{
UINTN Count;
EFI_PCI_IO_PROTOCOL_WIDTH Width;
EFI_PCI_IO_PROTOCOL *PciIo;
PciIo = Dev->PciIo;
Count = 1;
switch (FieldSize) {
case 1:
Width = EfiPciIoWidthUint8;
break;
case 2:
Width = EfiPciIoWidthUint16;
break;
case 8:
//
// The 64bit PCI I/O is broken down into two 32bit writes to prevent
// any alignment or width issues.
// The UEFI spec says under EFI_PCI_IO_PROTOCOL.Io.Write():
//
// The I/O operations are carried out exactly as requested. The caller
// is responsible for any alignment and I/O width issues which the
// bus, device, platform, or type of I/O might require. For example on
// some platforms, width requests of EfiPciIoWidthUint64 do not work
//
Count = Count * 2;
//
// fall through
//
case 4:
Width = EfiPciIoWidthUint32;
break;
default:
ASSERT (FALSE);
return EFI_INVALID_PARAMETER;
}
return PciIo->Io.Write (
PciIo,
Width,
PCI_BAR_IDX0,
FieldOffset,
Count,
&Value
);
}
/**
Device probe function for this driver.
The DXE core calls this function for any given device in order to see if the
driver can drive the device.
@param[in] This The EFI_DRIVER_BINDING_PROTOCOL object
incorporating this driver (independently of
any device).
@param[in] DeviceHandle The device to probe.
@param[in] RemainingDevicePath Relevant only for bus drivers, ignored.
@retval EFI_SUCCESS The driver supports the device being probed.
@retval EFI_UNSUPPORTED Based on virtio-pci discovery, we do not support
the device.
@return Error codes from the OpenProtocol() boot service or
the PciIo protocol.
**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciDeviceBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE DeviceHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
{
EFI_STATUS Status;
EFI_PCI_IO_PROTOCOL *PciIo;
PCI_TYPE00 Pci;
//
// Attempt to open the device with the PciIo set of interfaces. On success,
// the protocol is "instantiated" for the PCI device. Covers duplicate open
// attempts (EFI_ALREADY_STARTED).
//
Status = gBS->OpenProtocol (
DeviceHandle, // candidate device
&gEfiPciIoProtocolGuid, // for generic PCI access
(VOID **)&PciIo, // handle to instantiate
This->DriverBindingHandle, // requestor driver identity
DeviceHandle, // ControllerHandle, according to
// the UEFI Driver Model
EFI_OPEN_PROTOCOL_BY_DRIVER // get exclusive PciIo access to
// the device; to be released
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Read entire PCI configuration header for more extensive check ahead.
//
Status = PciIo->Pci.Read (
PciIo, // (protocol, device)
// handle
EfiPciIoWidthUint32, // access width & copy
// mode
0, // Offset
sizeof Pci / sizeof (UINT32), // Count
&Pci // target buffer
);
if (Status == EFI_SUCCESS) {
//
// virtio-0.9.5, 2.1 PCI Discovery
//
if ((Pci.Hdr.VendorId == VIRTIO_VENDOR_ID) &&
(Pci.Hdr.DeviceId >= 0x1000) &&
(Pci.Hdr.DeviceId <= 0x103F) &&
(Pci.Hdr.RevisionID == 0x00)) {
Status = EFI_SUCCESS;
} else {
Status = EFI_UNSUPPORTED;
}
}
//
// We needed PCI IO access only transitorily, to see whether we support the
// device or not.
//
gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
This->DriverBindingHandle, DeviceHandle);
return Status;
}
/**
Initialize the VirtIo PCI Device
@param[in, out] Dev The driver instance to configure. The caller is
responsible for Device->PciIo's validity (ie. working IO
access to the underlying virtio-pci device).
@retval EFI_SUCCESS Setup complete.
@retval EFI_UNSUPPORTED The underlying IO device doesn't support the
provided address offset and read size.
@return Error codes from PciIo->Pci.Read().
**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciInit (
IN OUT VIRTIO_PCI_DEVICE *Device
)
{
EFI_STATUS Status;
EFI_PCI_IO_PROTOCOL *PciIo;
PCI_TYPE00 Pci;
ASSERT (Device != NULL);
PciIo = Device->PciIo;
ASSERT (PciIo != NULL);
ASSERT (PciIo->Pci.Read != NULL);
Status = PciIo->Pci.Read (
PciIo, // (protocol, device)
// handle
EfiPciIoWidthUint32, // access width & copy
// mode
0, // Offset
sizeof (Pci) / sizeof (UINT32), // Count
&Pci // target buffer
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Copy protocol template
//
CopyMem (&Device->VirtioDevice, &mDeviceProtocolTemplate,
sizeof (VIRTIO_DEVICE_PROTOCOL));
//
// Initialize the protocol interface attributes
//
Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);
Device->VirtioDevice.SubSystemDeviceId = Pci.Device.SubsystemID;
//
// Note: We don't support the MSI-X capability. If we did,
// the offset would become 24 after enabling MSI-X.
//
Device->DeviceSpecificConfigurationOffset =
VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI;
return EFI_SUCCESS;
}
/**
Uninitialize the internals of a virtio-pci device that has been successfully
set up with VirtioPciInit().
@param[in, out] Dev The device to clean up.
**/
STATIC
VOID
EFIAPI
VirtioPciUninit (
IN OUT VIRTIO_PCI_DEVICE *Device
)
{
// Note: This function mirrors VirtioPciInit() that does not allocate any
// resources - there's nothing to free here.
}
/**
After we've pronounced support for a specific device in
DriverBindingSupported(), we start managing said device (passed in by the
Driver Execution Environment) with the following service.
See DriverBindingSupported() for specification references.
@param[in] This The EFI_DRIVER_BINDING_PROTOCOL object
incorporating this driver (independently of
any device).
@param[in] DeviceHandle The supported device to drive.
@param[in] RemainingDevicePath Relevant only for bus drivers, ignored.
@retval EFI_SUCCESS Driver instance has been created and
initialized for the virtio-pci device, it
is now accessible via VIRTIO_DEVICE_PROTOCOL.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@return Error codes from the OpenProtocol() boot
service, the PciIo protocol, VirtioPciInit(),
or the InstallProtocolInterface() boot service.
**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciDeviceBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE DeviceHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
{
VIRTIO_PCI_DEVICE *Device;
EFI_STATUS Status;
Device = (VIRTIO_PCI_DEVICE *) AllocateZeroPool (sizeof *Device);
if (Device == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
(VOID **)&Device->PciIo, This->DriverBindingHandle,
DeviceHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
if (EFI_ERROR (Status)) {
goto FreeVirtioPci;
}
//
// We must retain and ultimately restore the original PCI attributes of the
// device. See Driver Writer's Guide for UEFI 2.3.1 v1.01, 18.3 PCI drivers /
// 18.3.2 Start() and Stop().
//
// The third parameter ("Attributes", input) is ignored by the Get operation.
// The fourth parameter ("Result", output) is ignored by the Enable and Set
// operations.
//
// For virtio-pci we only need IO space access.
//
Status = Device->PciIo->Attributes (Device->PciIo,
EfiPciIoAttributeOperationGet, 0, &Device->OriginalPciAttributes);
if (EFI_ERROR (Status)) {
goto ClosePciIo;
}
Status = Device->PciIo->Attributes (
Device->PciIo,
EfiPciIoAttributeOperationEnable,
(EFI_PCI_IO_ATTRIBUTE_IO |
EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),
NULL
);
if (EFI_ERROR (Status)) {
goto ClosePciIo;
}
//
// PCI IO access granted, configure protocol instance
//
Status = VirtioPciInit (Device);
if (EFI_ERROR (Status)) {
goto RestorePciAttributes;
}
//
// Setup complete, attempt to export the driver instance's VirtioDevice
// interface.
//
Device->Signature = VIRTIO_PCI_DEVICE_SIGNATURE;
Status = gBS->InstallProtocolInterface (&DeviceHandle,
&gVirtioDeviceProtocolGuid, EFI_NATIVE_INTERFACE,
&Device->VirtioDevice);
if (EFI_ERROR (Status)) {
goto UninitDev;
}
return EFI_SUCCESS;
UninitDev:
VirtioPciUninit (Device);
RestorePciAttributes:
Device->PciIo->Attributes (Device->PciIo, EfiPciIoAttributeOperationSet,
Device->OriginalPciAttributes, NULL);
ClosePciIo:
gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
This->DriverBindingHandle, DeviceHandle);
FreeVirtioPci:
FreePool (Device);
return Status;
}
/**
Stop driving the Virtio PCI device
@param[in] This The EFI_DRIVER_BINDING_PROTOCOL object
incorporating this driver (independently of any
device).
@param[in] DeviceHandle Stop driving this device.
@param[in] NumberOfChildren Since this function belongs to a device driver
only (as opposed to a bus driver), the caller
environment sets NumberOfChildren to zero, and
we ignore it.
@param[in] ChildHandleBuffer Ignored (corresponding to NumberOfChildren).
@retval EFI_SUCCESS Driver instance has been stopped and the PCI
configuration attributes have been restored.
@return Error codes from the OpenProtocol() or
CloseProtocol(), UninstallProtocolInterface()
boot services.
**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciDeviceBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE DeviceHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
)
{
EFI_STATUS Status;
VIRTIO_DEVICE_PROTOCOL *VirtioDevice;
VIRTIO_PCI_DEVICE *Device;
Status = gBS->OpenProtocol (
DeviceHandle, // candidate device
&gVirtioDeviceProtocolGuid, // retrieve the VirtIo iface
(VOID **)&VirtioDevice, // target pointer
This->DriverBindingHandle, // requestor driver identity
DeviceHandle, // requesting lookup for dev.
EFI_OPEN_PROTOCOL_GET_PROTOCOL // lookup only, no ref. added
);
if (EFI_ERROR (Status)) {
return Status;
}
Device = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (VirtioDevice);
//
// Handle Stop() requests for in-use driver instances gracefully.
//
Status = gBS->UninstallProtocolInterface (DeviceHandle,
&gVirtioDeviceProtocolGuid, &Device->VirtioDevice);
if (EFI_ERROR (Status)) {
return Status;
}
VirtioPciUninit (Device);
Device->PciIo->Attributes (Device->PciIo, EfiPciIoAttributeOperationSet,
Device->OriginalPciAttributes, NULL);
Status = gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
This->DriverBindingHandle, DeviceHandle);
FreePool (Device);
return Status;
}
//
// The static object that groups the Supported() (ie. probe), Start() and
// Stop() functions of the driver together. Refer to UEFI Spec 2.3.1 + Errata
// C, 10.1 EFI Driver Binding Protocol.
//
STATIC EFI_DRIVER_BINDING_PROTOCOL gDriverBinding = {
&VirtioPciDeviceBindingSupported,
&VirtioPciDeviceBindingStart,
&VirtioPciDeviceBindingStop,
0x10, // Version, must be in [0x10 .. 0xFFFFFFEF] for IHV-developed drivers
NULL, // ImageHandle, to be overwritten by
// EfiLibInstallDriverBindingComponentName2() in VirtioPciEntryPoint()
NULL // DriverBindingHandle, ditto
};
//
// The purpose of the following scaffolding (EFI_COMPONENT_NAME_PROTOCOL and
// EFI_COMPONENT_NAME2_PROTOCOL implementation) is to format the driver's name
// in English, for display on standard console devices. This is recommended for
// UEFI drivers that follow the UEFI Driver Model. Refer to the Driver Writer's
// Guide for UEFI 2.3.1 v1.01, 11 UEFI Driver and Controller Names.
//
STATIC
EFI_UNICODE_STRING_TABLE mDriverNameTable[] = {
{ "eng;en", L"Virtio PCI Driver" },
{ NULL, NULL }
};
STATIC
EFI_COMPONENT_NAME_PROTOCOL gComponentName;
EFI_STATUS
EFIAPI
VirtioPciGetDriverName (
IN EFI_COMPONENT_NAME_PROTOCOL *This,
IN CHAR8 *Language,
OUT CHAR16 **DriverName
)
{
return LookupUnicodeString2 (
Language,
This->SupportedLanguages,
mDriverNameTable,
DriverName,
(BOOLEAN)(This == &gComponentName) // Iso639Language
);
}
EFI_STATUS
EFIAPI
VirtioPciGetDeviceName (
IN EFI_COMPONENT_NAME_PROTOCOL *This,
IN EFI_HANDLE DeviceHandle,
IN EFI_HANDLE ChildHandle,
IN CHAR8 *Language,
OUT CHAR16 **ControllerName
)
{
return EFI_UNSUPPORTED;
}
STATIC
EFI_COMPONENT_NAME_PROTOCOL gComponentName = {
&VirtioPciGetDriverName,
&VirtioPciGetDeviceName,
"eng" // SupportedLanguages, ISO 639-2 language codes
};
STATIC
EFI_COMPONENT_NAME2_PROTOCOL gComponentName2 = {
(EFI_COMPONENT_NAME2_GET_DRIVER_NAME) &VirtioPciGetDriverName,
(EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) &VirtioPciGetDeviceName,
"en" // SupportedLanguages, RFC 4646 language codes
};
//
// Entry point of this driver.
//
EFI_STATUS
EFIAPI
VirtioPciDeviceEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EfiLibInstallDriverBindingComponentName2 (
ImageHandle,
SystemTable,
&gDriverBinding,
ImageHandle,
&gComponentName,
&gComponentName2
);
}
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