/** @file
This driver produces Virtio Device Protocol instances for Virtio PCI devices.
Copyright (C) 2012, Red Hat, Inc.
Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2013, ARM Ltd.
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 <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
VirtioPciGetQueueAddress, // GetQueueAddress
VirtioPciSetQueueAddress, // SetQueueAddress
VirtioPciSetQueueSel, // SetQueueSel
VirtioPciSetQueueNotify, // SetQueueNotify
VirtioPciSetQueueAlignment, // SetQueueAlignment
VirtioPciSetPageSize, // SetPageSize
VirtioPciGetQueueSize, // GetQueueNumMax
VirtioPciSetQueueSize, // SetQueueNum
VirtioPciGetDeviceStatus, // GetDeviceStatus
VirtioPciSetDeviceStatus, // SetDeviceStatus
VirtioPciDeviceWrite, // WriteDevice
VirtioPciDeviceRead // ReadDevice
};
/**
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 Exeuction 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, 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
);
}