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/** @file
Provide EFI_SIMPLE_FILE_SYSTEM_PROTOCOL instances on virtio-fs devices.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h> // AsciiStrCmp()
#include <Library/MemoryAllocationLib.h> // AllocatePool()
#include <Library/UefiBootServicesTableLib.h> // gBS
#include <Protocol/ComponentName2.h> // EFI_COMPONENT_NAME2_PROTOCOL
#include <Protocol/DriverBinding.h> // EFI_DRIVER_BINDING_PROTOCOL
#include "VirtioFsDxe.h"
//
// UEFI Driver Model protocol instances.
//
STATIC EFI_DRIVER_BINDING_PROTOCOL mDriverBinding;
STATIC EFI_COMPONENT_NAME2_PROTOCOL mComponentName2;
//
// UEFI Driver Model protocol member functions.
//
EFI_STATUS
EFIAPI
VirtioFsBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
EFI_STATUS Status;
VIRTIO_DEVICE_PROTOCOL *Virtio;
EFI_STATUS CloseStatus;
Status = gBS->OpenProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
(VOID **)&Virtio, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
if (EFI_ERROR (Status)) {
return Status;
}
if (Virtio->SubSystemDeviceId != VIRTIO_SUBSYSTEM_FILESYSTEM) {
Status = EFI_UNSUPPORTED;
}
CloseStatus = gBS->CloseProtocol (ControllerHandle,
&gVirtioDeviceProtocolGuid, This->DriverBindingHandle,
ControllerHandle);
ASSERT_EFI_ERROR (CloseStatus);
return Status;
}
EFI_STATUS
EFIAPI
VirtioFsBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
VIRTIO_FS *VirtioFs;
EFI_STATUS Status;
EFI_STATUS CloseStatus;
VirtioFs = AllocatePool (sizeof *VirtioFs);
if (VirtioFs == NULL) {
return EFI_OUT_OF_RESOURCES;
}
VirtioFs->Signature = VIRTIO_FS_SIG;
Status = gBS->OpenProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
(VOID **)&VirtioFs->Virtio, This->DriverBindingHandle,
ControllerHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
if (EFI_ERROR (Status)) {
goto FreeVirtioFs;
}
Status = VirtioFsInit (VirtioFs);
if (EFI_ERROR (Status)) {
goto CloseVirtio;
}
Status = VirtioFsFuseInitSession (VirtioFs);
if (EFI_ERROR (Status)) {
goto UninitVirtioFs;
}
Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
VirtioFsExitBoot, VirtioFs, &VirtioFs->ExitBoot);
if (EFI_ERROR (Status)) {
goto UninitVirtioFs;
}
InitializeListHead (&VirtioFs->OpenFiles);
VirtioFs->SimpleFs.Revision = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION;
VirtioFs->SimpleFs.OpenVolume = VirtioFsOpenVolume;
Status = gBS->InstallProtocolInterface (&ControllerHandle,
&gEfiSimpleFileSystemProtocolGuid, EFI_NATIVE_INTERFACE,
&VirtioFs->SimpleFs);
if (EFI_ERROR (Status)) {
goto CloseExitBoot;
}
return EFI_SUCCESS;
CloseExitBoot:
CloseStatus = gBS->CloseEvent (VirtioFs->ExitBoot);
ASSERT_EFI_ERROR (CloseStatus);
UninitVirtioFs:
VirtioFsUninit (VirtioFs);
CloseVirtio:
CloseStatus = gBS->CloseProtocol (ControllerHandle,
&gVirtioDeviceProtocolGuid, This->DriverBindingHandle,
ControllerHandle);
ASSERT_EFI_ERROR (CloseStatus);
FreeVirtioFs:
FreePool (VirtioFs);
return Status;
}
EFI_STATUS
EFIAPI
VirtioFsBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
)
{
EFI_STATUS Status;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *SimpleFs;
VIRTIO_FS *VirtioFs;
Status = gBS->OpenProtocol (ControllerHandle,
&gEfiSimpleFileSystemProtocolGuid, (VOID **)&SimpleFs,
This->DriverBindingHandle, ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (EFI_ERROR (Status)) {
return Status;
}
VirtioFs = VIRTIO_FS_FROM_SIMPLE_FS (SimpleFs);
if (!IsListEmpty (&VirtioFs->OpenFiles)) {
return EFI_ACCESS_DENIED;
}
Status = gBS->UninstallProtocolInterface (ControllerHandle,
&gEfiSimpleFileSystemProtocolGuid, SimpleFs);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->CloseEvent (VirtioFs->ExitBoot);
ASSERT_EFI_ERROR (Status);
VirtioFsUninit (VirtioFs);
Status = gBS->CloseProtocol (ControllerHandle, &gVirtioDeviceProtocolGuid,
This->DriverBindingHandle, ControllerHandle);
ASSERT_EFI_ERROR (Status);
FreePool (VirtioFs);
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
VirtioFsGetDriverName (
IN EFI_COMPONENT_NAME2_PROTOCOL *This,
IN CHAR8 *Language,
OUT CHAR16 **DriverName
)
{
if (AsciiStrCmp (Language, "en") != 0) {
return EFI_UNSUPPORTED;
}
*DriverName = L"Virtio Filesystem Driver";
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
VirtioFsGetControllerName (
IN EFI_COMPONENT_NAME2_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_HANDLE ChildHandle OPTIONAL,
IN CHAR8 *Language,
OUT CHAR16 **ControllerName
)
{
return EFI_UNSUPPORTED;
}
//
// Entry point of this driver.
//
EFI_STATUS
EFIAPI
VirtioFsEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
mDriverBinding.Supported = VirtioFsBindingSupported;
mDriverBinding.Start = VirtioFsBindingStart;
mDriverBinding.Stop = VirtioFsBindingStop;
mDriverBinding.Version = 0x10;
mDriverBinding.ImageHandle = ImageHandle;
mDriverBinding.DriverBindingHandle = ImageHandle;
mComponentName2.GetDriverName = VirtioFsGetDriverName;
mComponentName2.GetControllerName = VirtioFsGetControllerName;
mComponentName2.SupportedLanguages = "en";
Status = gBS->InstallMultipleProtocolInterfaces (&ImageHandle,
&gEfiDriverBindingProtocolGuid, &mDriverBinding,
&gEfiComponentName2ProtocolGuid, &mComponentName2, NULL);
return Status;
}
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