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OvmfPkg/VirtioGpuDxe: introduce with Component Name 2 and Driver Binding 

This patch adds the skeleton of the driver: it implements the Component
Name 2 Protocol and the Driver  Binding Protocol, in accordance with the
generic and GOP-specific requirements set forth in the UEFI spec and the
Driver Writers' Guide.

The basic idea is that VGPU_DEV abstracts the virtio GPU device, while the
single VGPU_GOP that we intend to support at this point stands for "head"
(aka "scanout") #0.

For now, the Virtio Device Protocol is only used for driver binding; no
actual virtio operations are done yet. Similarly, we use a "dummy" GOP
GUID and protocol structure (a plain UINT8 object) for now, so that
GOP-consuming drivers don't look at what we produce just yet.

The driver is a bit different from the other virtio device drivers written
thus far:

- It implements the GetControllerName() member of the Component Name 2
  Protocol. (Formatting helpful names is recommended by UEFI.) As a "best
  effort", we format the PCI BDF into the name (a PCI backend is not
  guaranteed by VIRTIO_DEVICE_PROTOCOL). It should provide a more friendly
  experience in the shell and elsewhere.

- This driver seeks to support all RemainingDevicePath cases:
  - NULL: produce all (= one) child handles (= VGPU_GOP heads) at once,
  - End of Device Path Node: produce no child handles,
  - specific ACPI ADR Node: check if it's supportable, and produce it
    (only one specific child controller is supported).
  This is one of the reasons for separating VGPU_GOP from VGPU_DEV.

The driver is a hybrid driver: it produces both child handles (one, to be
exact), but also installs a structure (VGPU_DEV) directly on the VirtIo
controller handle, using gEfiCallerIdGuid as protocol GUID. This is a
trick I've seen elsewhere in edk2 (for example, TerminalDxe), and it is
necessary for the following reason:

In EFI_COMPONENT_NAME2_PROTOCOL.GetControllerName(), we must be able to
"cast down" a VirtIo ControllerHandle to our own private data structure
(VGPU_DEV). That's only possible if we install the structure directly on
the VirtIo ControllerHandle (thereby rendering the driver a hybrid
driver), because a child controller with our GOP implementation on it may
not exist / be passed in there.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Ref: https://tianocore.acgmultimedia.com/show_bug.cgi?id=66
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Laszlo Ersek 2016-08-15 15:34:32 +02:00
parent 92dc5e9d74
commit a2a4fa6670
3 changed files with 984 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

831
OvmfPkg/VirtioGpuDxe/DriverBinding.c Normal file
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/** @file
Implement the Driver Binding Protocol and the Component Name 2 Protocol for
the Virtio GPU hybrid driver.
Copyright (C) 2016, Red Hat, Inc.
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 <Library/BaseMemoryLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PrintLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Protocol/ComponentName2.h>
#include <Protocol/DevicePath.h>
#include <Protocol/DriverBinding.h>
#include <Protocol/PciIo.h>
#include "VirtioGpu.h"
//
// Dummy Graphics Output Protocol GUID: a temporary placeholder for the EFI
// counterpart. It will be replaced with the real thing as soon as we implement
// the EFI GOP. Refer to VGPU_GOP.Gop.
//
STATIC EFI_GUID mDummyGraphicsOutputProtocolGuid = {
0x4983f8dc, 0x2782, 0x415b,
{ 0x91, 0xf5, 0x2c, 0xeb, 0x48, 0x4a, 0x0f, 0xe9 }
};
//
// The device path node that describes the Video Output Device Attributes for
// the single head (UEFI child handle) that we support.
//
// The ACPI_DISPLAY_ADR() macro corresponds to Table B-2, section "B.4.2 _DOD"
// in the ACPI 3.0b spec, or more recently, to Table B-379, section "B.3.2
// _DOD" in the ACPI 6.0 spec.
//
STATIC CONST ACPI_ADR_DEVICE_PATH mAcpiAdr = {
{ // Header
ACPI_DEVICE_PATH, // Type
ACPI_ADR_DP, // SubType
{ sizeof mAcpiAdr, 0 }, // Length
},
ACPI_DISPLAY_ADR ( // ADR
1, // DeviceIdScheme: use the ACPI
// bit-field definitions
0, // HeadId
0, // NonVgaOutput
1, // BiosCanDetect
0, // VendorInfo
ACPI_ADR_DISPLAY_TYPE_EXTERNAL_DIGITAL, // Type
0, // Port
0 // Index
)
};
//
// Component Name 2 Protocol implementation.
//
STATIC CONST EFI_UNICODE_STRING_TABLE mDriverNameTable[] = {
{ "en", L"Virtio GPU Driver" },
{ NULL, NULL }
};
STATIC
EFI_STATUS
EFIAPI
VirtioGpuGetDriverName (
IN EFI_COMPONENT_NAME2_PROTOCOL *This,
IN CHAR8 *Language,
OUT CHAR16 **DriverName
)
{
return LookupUnicodeString2 (Language, This->SupportedLanguages,
mDriverNameTable, DriverName, FALSE /* Iso639Language */);
}
STATIC
EFI_STATUS
EFIAPI
VirtioGpuGetControllerName (
IN EFI_COMPONENT_NAME2_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_HANDLE ChildHandle OPTIONAL,
IN CHAR8 *Language,
OUT CHAR16 **ControllerName
)
{
EFI_STATUS Status;
VGPU_DEV *VgpuDev;
//
// Look up the VGPU_DEV "protocol interface" on ControllerHandle.
//
Status = gBS->OpenProtocol (ControllerHandle, &gEfiCallerIdGuid,
(VOID **)&VgpuDev, gImageHandle, ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Sanity check: if we found gEfiCallerIdGuid on ControllerHandle, then we
// keep its Virtio Device Protocol interface open BY_DRIVER.
//
ASSERT_EFI_ERROR (EfiTestManagedDevice (ControllerHandle, gImageHandle,
&gVirtioDeviceProtocolGuid));
if (ChildHandle == NULL) {
//
// The caller is querying the name of the VGPU_DEV controller.
//
return LookupUnicodeString2 (Language, This->SupportedLanguages,
VgpuDev->BusName, ControllerName, FALSE /* Iso639Language */);
}
//
// Otherwise, the caller is looking for the name of the GOP child controller.
// Check if it is asking about the GOP child controller that we manage. (The
// condition below covers the case when we haven't produced the GOP child
// controller yet, or we've destroyed it since.)
//
if (VgpuDev->Child == NULL || ChildHandle != VgpuDev->Child->GopHandle) {
return EFI_UNSUPPORTED;
}
//
// Sanity check: our GOP child controller keeps the VGPU_DEV controller's
// Virtio Device Protocol interface open BY_CHILD_CONTROLLER.
//
ASSERT_EFI_ERROR (EfiTestChildHandle (ControllerHandle, ChildHandle,
&gVirtioDeviceProtocolGuid));
return LookupUnicodeString2 (Language, This->SupportedLanguages,
VgpuDev->Child->GopName, ControllerName,
FALSE /* Iso639Language */);
}
STATIC CONST EFI_COMPONENT_NAME2_PROTOCOL mComponentName2 = {
VirtioGpuGetDriverName,
VirtioGpuGetControllerName,
"en" // SupportedLanguages (RFC 4646)
};
//
// Helper functions for the Driver Binding Protocol Implementation.
//
/**
Format the VGPU_DEV controller name, to be looked up and returned by
VirtioGpuGetControllerName().
@param[in] ControllerHandle The handle that identifies the VGPU_DEV
controller.
@param[in] AgentHandle The handle of the agent that will attempt to
temporarily open the PciIo protocol. This is the
DriverBindingHandle member of the
EFI_DRIVER_BINDING_PROTOCOL whose Start()
function is calling this function.
@param[in] DevicePath The device path that is installed on
ControllerHandle.
@param[out] ControllerName A dynamically allocated unicode string that
unconditionally says "Virtio GPU Device", with a
PCI Segment:Bus:Device.Function location
optionally appended. The latter part is only
produced if DevicePath contains at least one
PciIo node; in that case, the most specific such
node is used for retrieving the location info.
The caller is responsible for freeing
ControllerName after use.
@retval EFI_SUCCESS ControllerName has been formatted.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory for ControllerName.
**/
STATIC
EFI_STATUS
FormatVgpuDevName (
IN EFI_HANDLE ControllerHandle,
IN EFI_HANDLE AgentHandle,
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,
OUT CHAR16 **ControllerName
)
{
EFI_HANDLE PciIoHandle;
EFI_PCI_IO_PROTOCOL *PciIo;
UINTN Segment, Bus, Device, Function;
STATIC CONST CHAR16 ControllerNameStem[] = L"Virtio GPU Device";
UINTN ControllerNameSize;
if (EFI_ERROR (gBS->LocateDevicePath (&gEfiPciIoProtocolGuid, &DevicePath,
&PciIoHandle)) ||
EFI_ERROR (gBS->OpenProtocol (PciIoHandle, &gEfiPciIoProtocolGuid,
(VOID **)&PciIo, AgentHandle, ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL)) ||
EFI_ERROR (PciIo->GetLocation (PciIo, &Segment, &Bus, &Device,
&Function))) {
//
// Failed to retrieve location info, return verbatim copy of static string.
//
*ControllerName = AllocateCopyPool (sizeof ControllerNameStem,
ControllerNameStem);
return (*ControllerName == NULL) ? EFI_OUT_OF_RESOURCES : EFI_SUCCESS;
}
//
// Location info available, format ControllerName dynamically.
//
ControllerNameSize = sizeof ControllerNameStem + // includes L'\0'
sizeof (CHAR16) * (1 + 4 + // Segment
1 + 2 + // Bus
1 + 2 + // Device
1 + 1 // Function
);
*ControllerName = AllocatePool (ControllerNameSize);
if (*ControllerName == NULL) {
return EFI_OUT_OF_RESOURCES;
}
UnicodeSPrintAsciiFormat (*ControllerName, ControllerNameSize,
"%s %04x:%02x:%02x.%x", ControllerNameStem, (UINT32)Segment, (UINT32)Bus,
(UINT32)Device, (UINT32)Function);
return EFI_SUCCESS;
}
/**
Dynamically allocate and initialize the VGPU_GOP child object within an
otherwise configured parent VGPU_DEV object.
This function adds a BY_CHILD_CONTROLLER reference to ParentBusController's
VIRTIO_DEVICE_PROTOCOL interface.
@param[in,out] ParentBus The pre-initialized VGPU_DEV object that the
newly created VGPU_GOP object will be the
child of.
@param[in] ParentDevicePath The device path protocol instance that is
installed on ParentBusController.
@param[in] ParentBusController The UEFI controller handle on which the
ParentBus VGPU_DEV object and the
ParentDevicePath device path protocol are
installed.
@param[in] DriverBindingHandle The DriverBindingHandle member of
EFI_DRIVER_BINDING_PROTOCOL whose Start()
function is calling this function. It is
passed as AgentHandle to gBS->OpenProtocol()
when creating the BY_CHILD_CONTROLLER
reference.
@retval EFI_SUCCESS ParentBus->Child has been created and
populated, and ParentBus->Child->GopHandle now
references ParentBusController->VirtIo
BY_CHILD_CONTROLLER.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
@return Error codes from underlying functions.
**/
STATIC
EFI_STATUS
InitVgpuGop (
IN OUT VGPU_DEV *ParentBus,
IN EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath,
IN EFI_HANDLE ParentBusController,
IN EFI_HANDLE DriverBindingHandle
)
{
VGPU_GOP *VgpuGop;
EFI_STATUS Status;
CHAR16 *ParentBusName;
STATIC CONST CHAR16 NameSuffix[] = L" Head #0";
UINTN NameSize;
CHAR16 *Name;
EFI_TPL OldTpl;
VOID *ParentVirtIo;
VgpuGop = AllocateZeroPool (sizeof *VgpuGop);
if (VgpuGop == NULL) {
return EFI_OUT_OF_RESOURCES;
}
VgpuGop->Signature = VGPU_GOP_SIG;
VgpuGop->ParentBus = ParentBus;
//
// Format a human-readable controller name for VGPU_GOP, and stash it for
// VirtioGpuGetControllerName() to look up. We simply append NameSuffix to
// ParentBus->BusName.
//
Status = LookupUnicodeString2 ("en", mComponentName2.SupportedLanguages,
ParentBus->BusName, &ParentBusName, FALSE /* Iso639Language */);
ASSERT_EFI_ERROR (Status);
NameSize = StrSize (ParentBusName) - sizeof (CHAR16) + sizeof NameSuffix;
Name = AllocatePool (NameSize);
if (Name == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto FreeVgpuGop;
}
UnicodeSPrintAsciiFormat (Name, NameSize, "%s%s", ParentBusName, NameSuffix);
Status = AddUnicodeString2 ("en", mComponentName2.SupportedLanguages,
&VgpuGop->GopName, Name, FALSE /* Iso639Language */);
FreePool (Name);
if (EFI_ERROR (Status)) {
goto FreeVgpuGop;
}
//
// Create the child device path.
//
VgpuGop->GopDevicePath = AppendDevicePathNode (ParentDevicePath,
&mAcpiAdr.Header);
if (VgpuGop->GopDevicePath == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto FreeVgpuGopName;
}
//
// Mask protocol notify callbacks until we're done.
//
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
//
// Create the child handle with the child device path.
//
Status = gBS->InstallProtocolInterface (&VgpuGop->GopHandle,
&gEfiDevicePathProtocolGuid, EFI_NATIVE_INTERFACE,
VgpuGop->GopDevicePath);
if (EFI_ERROR (Status)) {
goto FreeDevicePath;
}
//
// The child handle must present a reference to the parent handle's Virtio
// Device Protocol interface.
//
Status = gBS->OpenProtocol (ParentBusController, &gVirtioDeviceProtocolGuid,
&ParentVirtIo, DriverBindingHandle, VgpuGop->GopHandle,
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER);
if (EFI_ERROR (Status)) {
goto UninstallDevicePath;
}
ASSERT (ParentVirtIo == ParentBus->VirtIo);
//
// Initialize our Graphics Output Protocol.
//
// This means "nothing" for now.
//
Status = EFI_SUCCESS;
if (EFI_ERROR (Status)) {
goto CloseVirtIoByChild;
}
//
// Install the Graphics Output Protocol on the child handle.
//
Status = gBS->InstallProtocolInterface (&VgpuGop->GopHandle,
&mDummyGraphicsOutputProtocolGuid, EFI_NATIVE_INTERFACE,
&VgpuGop->Gop);
if (EFI_ERROR (Status)) {
goto UninitGop;
}
//
// We're done.
//
gBS->RestoreTPL (OldTpl);
ParentBus->Child = VgpuGop;
return EFI_SUCCESS;
UninitGop:
//
// Nothing, for now.
//
CloseVirtIoByChild:
gBS->CloseProtocol (ParentBusController, &gVirtioDeviceProtocolGuid,
DriverBindingHandle, VgpuGop->GopHandle);
UninstallDevicePath:
gBS->UninstallProtocolInterface (VgpuGop->GopHandle,
&gEfiDevicePathProtocolGuid, VgpuGop->GopDevicePath);
FreeDevicePath:
gBS->RestoreTPL (OldTpl);
FreePool (VgpuGop->GopDevicePath);
FreeVgpuGopName:
FreeUnicodeStringTable (VgpuGop->GopName);
FreeVgpuGop:
FreePool (VgpuGop);
return Status;
}
/**
Tear down and release the VGPU_GOP child object within the VGPU_DEV parent
object.
This function removes the BY_CHILD_CONTROLLER reference from
ParentBusController's VIRTIO_DEVICE_PROTOCOL interface.
@param[in,out] ParentBus The VGPU_DEV object that the VGPU_GOP child
object will be removed from.
@param[in] ParentBusController The UEFI controller handle on which the
ParentBus VGPU_DEV object is installed.
@param[in] DriverBindingHandle The DriverBindingHandle member of
EFI_DRIVER_BINDING_PROTOCOL whose Stop()
function is calling this function. It is
passed as AgentHandle to gBS->CloseProtocol()
when removing the BY_CHILD_CONTROLLER
reference.
**/
STATIC
VOID
UninitVgpuGop (
IN OUT VGPU_DEV *ParentBus,
IN EFI_HANDLE ParentBusController,
IN EFI_HANDLE DriverBindingHandle
)
{
VGPU_GOP *VgpuGop;
EFI_STATUS Status;
VgpuGop = ParentBus->Child;
Status = gBS->UninstallProtocolInterface (VgpuGop->GopHandle,
&mDummyGraphicsOutputProtocolGuid, &VgpuGop->Gop);
ASSERT_EFI_ERROR (Status);
//
// Uninitialize VgpuGop->Gop.
//
// Nothing, for now.
//
Status = EFI_SUCCESS;
ASSERT_EFI_ERROR (Status);
Status = gBS->CloseProtocol (ParentBusController, &gVirtioDeviceProtocolGuid,
DriverBindingHandle, VgpuGop->GopHandle);
ASSERT_EFI_ERROR (Status);
Status = gBS->UninstallProtocolInterface (VgpuGop->GopHandle,
&gEfiDevicePathProtocolGuid, VgpuGop->GopDevicePath);
ASSERT_EFI_ERROR (Status);
FreePool (VgpuGop->GopDevicePath);
FreeUnicodeStringTable (VgpuGop->GopName);
FreePool (VgpuGop);
ParentBus->Child = NULL;
}
//
// Driver Binding Protocol Implementation.
//
STATIC
EFI_STATUS
EFIAPI
VirtioGpuDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
EFI_STATUS Status;
VIRTIO_DEVICE_PROTOCOL *VirtIo;
//
// - If RemainingDevicePath is NULL: the caller is interested in creating all
// child handles.
// - If RemainingDevicePath points to an end node: the caller is not
// interested in creating any child handle.
// - Otherwise, the caller would like to create the one child handle
// specified in RemainingDevicePath. In this case we have to see if the
// requested device path is supportable.
//
if (RemainingDevicePath != NULL &&
!IsDevicePathEnd (RemainingDevicePath) &&
(DevicePathNodeLength (RemainingDevicePath) != sizeof mAcpiAdr ||
CompareMem (RemainingDevicePath, &mAcpiAdr, sizeof mAcpiAdr) != 0)) {
return EFI_UNSUPPORTED;
}
//
// Open the Virtio Device Protocol interface on the controller, BY_DRIVER.
//
Status = gBS->OpenProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
(VOID **)&VirtIo, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
if (EFI_ERROR (Status)) {
//
// If this fails, then by default we cannot support ControllerHandle. There
// is one exception: we've already bound the device, have not produced any
// GOP child controller, and now the caller wants us to produce the child
// controller (either specifically or as part of "all children"). That's
// allowed.
//
if (Status == EFI_ALREADY_STARTED) {
EFI_STATUS Status2;
VGPU_DEV *VgpuDev;
Status2 = gBS->OpenProtocol (ControllerHandle, &gEfiCallerIdGuid,
(VOID **)&VgpuDev, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
ASSERT_EFI_ERROR (Status2);
if (VgpuDev->Child == NULL &&
(RemainingDevicePath == NULL ||
!IsDevicePathEnd (RemainingDevicePath))) {
Status = EFI_SUCCESS;
}
}
return Status;
}
//
// First BY_DRIVER open; check the VirtIo revision and subsystem.
//
if (VirtIo->Revision < VIRTIO_SPEC_REVISION (1, 0, 0) ||
VirtIo->SubSystemDeviceId != VIRTIO_SUBSYSTEM_GPU_DEVICE) {
Status = EFI_UNSUPPORTED;
goto CloseVirtIo;
}
//
// We'll need the device path of the VirtIo device both for formatting
// VGPU_DEV.BusName and for populating VGPU_GOP.GopDevicePath.
//
Status = gBS->OpenProtocol (ControllerHandle, &gEfiDevicePathProtocolGuid,
NULL, This->DriverBindingHandle, ControllerHandle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL);
CloseVirtIo:
gBS->CloseProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
This->DriverBindingHandle, ControllerHandle);
return Status;
}
STATIC
EFI_STATUS
EFIAPI
VirtioGpuDriverBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
EFI_STATUS Status;
VIRTIO_DEVICE_PROTOCOL *VirtIo;
BOOLEAN VirtIoBoundJustNow;
VGPU_DEV *VgpuDev;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
//
// Open the Virtio Device Protocol.
//
// The result of this operation, combined with the checks in
// VirtioGpuDriverBindingSupported(), uniquely tells us whether we are
// binding the VirtIo controller on this call (with or without creating child
// controllers), or else we're *only* creating child controllers.
//
Status = gBS->OpenProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
(VOID **)&VirtIo, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
if (EFI_ERROR (Status)) {
//
// The assertions below are based on the success of
// VirtioGpuDriverBindingSupported(): we bound ControllerHandle earlier,
// without producing child handles, and now we're producing the GOP child
// handle only.
//
ASSERT (Status == EFI_ALREADY_STARTED);
Status = gBS->OpenProtocol (ControllerHandle, &gEfiCallerIdGuid,
(VOID **)&VgpuDev, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
ASSERT_EFI_ERROR (Status);
ASSERT (VgpuDev->Child == NULL);
ASSERT (
RemainingDevicePath == NULL || !IsDevicePathEnd (RemainingDevicePath));
VirtIoBoundJustNow = FALSE;
} else {
VirtIoBoundJustNow = TRUE;
//
// Allocate the private structure.
//
VgpuDev = AllocateZeroPool (sizeof *VgpuDev);
if (VgpuDev == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto CloseVirtIo;
}
VgpuDev->VirtIo = VirtIo;
}
//
// Grab the VirtIo controller's device path. This is necessary regardless of
// VirtIoBoundJustNow.
//
Status = gBS->OpenProtocol (ControllerHandle, &gEfiDevicePathProtocolGuid,
(VOID **)&DevicePath, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (EFI_ERROR (Status)) {
goto FreeVgpuDev;
}
//
// Create VGPU_DEV if we've bound the VirtIo controller right now (that is,
// if we aren't *only* creating child handles).
//
if (VirtIoBoundJustNow) {
CHAR16 *VgpuDevName;
//
// Format a human-readable controller name for VGPU_DEV, and stash it for
// VirtioGpuGetControllerName() to look up.
//
Status = FormatVgpuDevName (ControllerHandle, This->DriverBindingHandle,
DevicePath, &VgpuDevName);
if (EFI_ERROR (Status)) {
goto FreeVgpuDev;
}
Status = AddUnicodeString2 ("en", mComponentName2.SupportedLanguages,
&VgpuDev->BusName, VgpuDevName, FALSE /* Iso639Language */);
FreePool (VgpuDevName);
if (EFI_ERROR (Status)) {
goto FreeVgpuDev;
}
//
// Install the VGPU_DEV "protocol interface" on ControllerHandle.
//
Status = gBS->InstallProtocolInterface (&ControllerHandle,
&gEfiCallerIdGuid, EFI_NATIVE_INTERFACE, VgpuDev);
if (EFI_ERROR (Status)) {
goto FreeVgpuDevBusName;
}
if (RemainingDevicePath != NULL && IsDevicePathEnd (RemainingDevicePath)) {
//
// No child handle should be produced; we're done.
//
DEBUG ((EFI_D_INFO, "%a: bound VirtIo=%p without producing GOP\n",
__FUNCTION__, (VOID *)VgpuDev->VirtIo));
return EFI_SUCCESS;
}
}
//
// Below we'll produce our single child handle: the caller requested it
// either specifically, or as part of all child handles.
//
ASSERT (VgpuDev->Child == NULL);
ASSERT (
RemainingDevicePath == NULL || !IsDevicePathEnd (RemainingDevicePath));
Status = InitVgpuGop (VgpuDev, DevicePath, ControllerHandle,
This->DriverBindingHandle);
if (EFI_ERROR (Status)) {
goto UninstallVgpuDev;
}
//
// We're done.
//
DEBUG ((EFI_D_INFO, "%a: produced GOP %a VirtIo=%p\n", __FUNCTION__,
VirtIoBoundJustNow ? "while binding" : "for pre-bound",
(VOID *)VgpuDev->VirtIo));
return EFI_SUCCESS;
UninstallVgpuDev:
if (VirtIoBoundJustNow) {
gBS->UninstallProtocolInterface (ControllerHandle, &gEfiCallerIdGuid,
VgpuDev);
}
FreeVgpuDevBusName:
if (VirtIoBoundJustNow) {
FreeUnicodeStringTable (VgpuDev->BusName);
}
FreeVgpuDev:
if (VirtIoBoundJustNow) {
FreePool (VgpuDev);
}
CloseVirtIo:
if (VirtIoBoundJustNow) {
gBS->CloseProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
This->DriverBindingHandle, ControllerHandle);
}
return Status;
}
STATIC
EFI_STATUS
EFIAPI
VirtioGpuDriverBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
)
{
EFI_STATUS Status;
VGPU_DEV *VgpuDev;
//
// Look up the VGPU_DEV "protocol interface" on ControllerHandle.
//
Status = gBS->OpenProtocol (ControllerHandle, &gEfiCallerIdGuid,
(VOID **)&VgpuDev, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Sanity check: if we found gEfiCallerIdGuid on ControllerHandle, then we
// keep its Virtio Device Protocol interface open BY_DRIVER.
//
ASSERT_EFI_ERROR (EfiTestManagedDevice (ControllerHandle,
This->DriverBindingHandle, &gVirtioDeviceProtocolGuid));
switch (NumberOfChildren) {
case 0:
//
// The caller wants us to unbind the VirtIo controller.
//
if (VgpuDev->Child != NULL) {
//
// We still have the GOP child.
//
Status = EFI_DEVICE_ERROR;
break;
}
DEBUG ((EFI_D_INFO, "%a: unbinding GOP-less VirtIo=%p\n", __FUNCTION__,
(VOID *)VgpuDev->VirtIo));
Status = gBS->UninstallProtocolInterface (ControllerHandle,
&gEfiCallerIdGuid, VgpuDev);
ASSERT_EFI_ERROR (Status);
FreeUnicodeStringTable (VgpuDev->BusName);
FreePool (VgpuDev);
Status = gBS->CloseProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
This->DriverBindingHandle, ControllerHandle);
ASSERT_EFI_ERROR (Status);
break;
case 1:
//
// The caller wants us to destroy our child GOP controller.
//
if (VgpuDev->Child == NULL ||
ChildHandleBuffer[0] != VgpuDev->Child->GopHandle) {
//
// We have no child controller at the moment, or it differs from the one
// the caller wants us to destroy. I.e., we don't own the child
// controller passed in.
//
Status = EFI_DEVICE_ERROR;
break;
}
//
// Sanity check: our GOP child controller keeps the VGPU_DEV controller's
// Virtio Device Protocol interface open BY_CHILD_CONTROLLER.
//
ASSERT_EFI_ERROR (EfiTestChildHandle (ControllerHandle,
VgpuDev->Child->GopHandle,
&gVirtioDeviceProtocolGuid));
DEBUG ((EFI_D_INFO, "%a: destroying GOP under VirtIo=%p\n", __FUNCTION__,
(VOID *)VgpuDev->VirtIo));
UninitVgpuGop (VgpuDev, ControllerHandle, This->DriverBindingHandle);
break;
default:
//
// Impossible, we never produced more than one child.
//
Status = EFI_DEVICE_ERROR;
break;
}
return Status;
}
STATIC EFI_DRIVER_BINDING_PROTOCOL mDriverBinding = {
VirtioGpuDriverBindingSupported,
VirtioGpuDriverBindingStart,
VirtioGpuDriverBindingStop,
0x10, // Version
NULL, // ImageHandle, overwritten in entry point
NULL // DriverBindingHandle, ditto
};
//
// Entry point of the driver.
//
EFI_STATUS
EFIAPI
VirtioGpuEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EfiLibInstallDriverBindingComponentName2 (ImageHandle, SystemTable,
&mDriverBinding, ImageHandle, NULL /* ComponentName */,
&mComponentName2);
}

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/** @file
Internal type and macro definitions for the Virtio GPU hybrid driver.
Copyright (C) 2016, Red Hat, Inc.
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.
**/
#ifndef _VIRTIO_GPU_DXE_H_
#define _VIRTIO_GPU_DXE_H_
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#include <Protocol/VirtioDevice.h>
//
// Forward declaration of VGPU_GOP.
//
typedef struct VGPU_GOP_STRUCT VGPU_GOP;
//
// The abstraction that directly corresponds to a Virtio GPU device.
//
// This structure will be installed on the handle that has the VirtIo Device
// Protocol interface, with GUID gEfiCallerIdGuid. A similar trick is employed
// in TerminalDxe, and it is necessary so that we can look up VGPU_DEV just
// from the VirtIo Device Protocol handle in the Component Name 2 Protocol
// implementation.
//
typedef struct {
//
// VirtIo represents access to the Virtio GPU device. Never NULL.
//
VIRTIO_DEVICE_PROTOCOL *VirtIo;
//
// BusName carries a customized name for
// EFI_COMPONENT_NAME2_PROTOCOL.GetControllerName(). It is expressed in table
// form because it can theoretically support several languages. Never NULL.
//
EFI_UNICODE_STRING_TABLE *BusName;
//
// The Child field references the GOP wrapper structure. If this pointer is
// NULL, then the hybrid driver has bound (i.e., started) the
// VIRTIO_DEVICE_PROTOCOL controller without producing the child GOP
// controller (that is, after Start() was called with RemainingDevicePath
// pointing to and End of Device Path node). Child can be created and
// destroyed, even repeatedly, independently of VGPU_DEV.
//
// In practice, this field represents the single head (scanout) that we
// support.
//
VGPU_GOP *Child;
} VGPU_DEV;
//
// The Graphics Output Protocol wrapper structure.
//
#define VGPU_GOP_SIG SIGNATURE_64 ('V', 'G', 'P', 'U', '_', 'G', 'O', 'P')
struct VGPU_GOP_STRUCT {
UINT64 Signature;
//
// ParentBus points to the parent VGPU_DEV object. Never NULL.
//
VGPU_DEV *ParentBus;
//
// GopName carries a customized name for
// EFI_COMPONENT_NAME2_PROTOCOL.GetControllerName(). It is expressed in table
// form because it can theoretically support several languages. Never NULL.
//
EFI_UNICODE_STRING_TABLE *GopName;
//
// GopHandle is the UEFI child handle that carries the device path ending
// with the ACPI ADR node, and the Graphics Output Protocol. Never NULL.
//
EFI_HANDLE GopHandle;
//
// The GopDevicePath field is the device path installed on GopHandle,
// ending with an ACPI ADR node. Never NULL.
//
EFI_DEVICE_PATH_PROTOCOL *GopDevicePath;
//
// The Gop field is installed on the child handle as Graphics Output Protocol
// interface.
//
// For now it is just a placeholder.
//
UINT8 Gop;
};
#endif // _VIRTIO_GPU_DXE_H_

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OvmfPkg/VirtioGpuDxe/VirtioGpu.inf Normal file
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## @file
#
# This hybrid driver produces the Graphics Output Protocol for the Virtio GPU
# device (head #0, only and unconditionally).
#
# Copyright (C) 2016, Red Hat, Inc.
#
# 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.
#
##
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = VirtioGpuDxe
FILE_GUID = D6099B94-CD97-4CC5-8714-7F6312701A8A
MODULE_TYPE = UEFI_DRIVER
VERSION_STRING = 1.0
ENTRY_POINT = VirtioGpuEntryPoint
[Sources]
DriverBinding.c
VirtioGpu.h
[Packages]
MdePkg/MdePkg.dec
OvmfPkg/OvmfPkg.dec
[LibraryClasses]
BaseMemoryLib
DebugLib
DevicePathLib
MemoryAllocationLib
PrintLib
UefiBootServicesTableLib
UefiDriverEntryPoint
UefiLib
[Protocols]
gEfiDevicePathProtocolGuid ## TO_START ## BY_START
gEfiPciIoProtocolGuid ## TO_START
gVirtioDeviceProtocolGuid ## TO_START