mirror of https://github.com/acidanthera/audk.git
389 lines
15 KiB
C
389 lines
15 KiB
C
/** @file
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This driver produce a BlockIo protocol instance for a Xen PV block device.
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This driver support XenBus protocol of type 'vbd'. Every function that
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comsume XenBus protocol are in BlockFront, which the implementation to access
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a Xen PV device. The BlockIo implementation is in it's one file and will call
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BlockFront functions.
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Copyright (C) 2014, Citrix Ltd.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "XenPvBlkDxe.h"
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#include "BlockFront.h"
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///
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/// Driver Binding Protocol instance
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///
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EFI_DRIVER_BINDING_PROTOCOL gXenPvBlkDxeDriverBinding = {
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XenPvBlkDxeDriverBindingSupported,
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XenPvBlkDxeDriverBindingStart,
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XenPvBlkDxeDriverBindingStop,
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XEN_PV_BLK_DXE_VERSION,
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NULL,
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NULL
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};
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/**
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Unloads an image.
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@param ImageHandle Handle that identifies the image to be unloaded.
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@retval EFI_SUCCESS The image has been unloaded.
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@retval EFI_INVALID_PARAMETER ImageHandle is not a valid image handle.
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**/
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EFI_STATUS
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EFIAPI
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XenPvBlkDxeUnload (
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IN EFI_HANDLE ImageHandle
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)
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{
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EFI_STATUS Status;
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EFI_HANDLE *HandleBuffer;
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UINTN HandleCount;
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UINTN Index;
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//
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// Retrieve array of all handles in the handle database
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//
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Status = gBS->LocateHandleBuffer (
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AllHandles,
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NULL,
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NULL,
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&HandleCount,
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&HandleBuffer
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Disconnect the current driver from handles in the handle database
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//
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for (Index = 0; Index < HandleCount; Index++) {
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gBS->DisconnectController (HandleBuffer[Index], gImageHandle, NULL);
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}
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//
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// Free the array of handles
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//
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FreePool (HandleBuffer);
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//
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// Uninstall protocols installed in the driver entry point
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//
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Status = gBS->UninstallMultipleProtocolInterfaces (
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ImageHandle,
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&gEfiDriverBindingProtocolGuid, &gXenPvBlkDxeDriverBinding,
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&gEfiComponentNameProtocolGuid, &gXenPvBlkDxeComponentName,
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&gEfiComponentName2ProtocolGuid, &gXenPvBlkDxeComponentName2,
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NULL
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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return EFI_SUCCESS;
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}
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/**
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This is the declaration of an EFI image entry point. This entry point is
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the same for UEFI Applications, UEFI OS Loaders, and UEFI Drivers including
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both device drivers and bus drivers.
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@param ImageHandle The firmware allocated handle for the UEFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval Others An unexpected error occurred.
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**/
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EFI_STATUS
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EFIAPI
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XenPvBlkDxeDriverEntryPoint (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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//
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// Install UEFI Driver Model protocol(s).
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//
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Status = EfiLibInstallDriverBindingComponentName2 (
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ImageHandle,
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SystemTable,
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&gXenPvBlkDxeDriverBinding,
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ImageHandle,
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&gXenPvBlkDxeComponentName,
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&gXenPvBlkDxeComponentName2
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);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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/**
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Tests to see if this driver supports a given controller. If a child device is provided,
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it further tests to see if this driver supports creating a handle for the specified child device.
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This function checks to see if the driver specified by This supports the device specified by
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ControllerHandle. Drivers will typically use the device path attached to
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ControllerHandle and/or the services from the bus I/O abstraction attached to
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ControllerHandle to determine if the driver supports ControllerHandle. This function
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may be called many times during platform initialization. In order to reduce boot times, the tests
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performed by this function must be very small, and take as little time as possible to execute. This
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function must not change the state of any hardware devices, and this function must be aware that the
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device specified by ControllerHandle may already be managed by the same driver or a
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different driver. This function must match its calls to AllocatePages() with FreePages(),
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AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
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Because ControllerHandle may have been previously started by the same driver, if a protocol is
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already in the opened state, then it must not be closed with CloseProtocol(). This is required
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to guarantee the state of ControllerHandle is not modified by this function.
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@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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@param[in] ControllerHandle The handle of the controller to test. This handle
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must support a protocol interface that supplies
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an I/O abstraction to the driver.
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@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
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parameter is ignored by device drivers, and is optional for bus
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drivers. For bus drivers, if this parameter is not NULL, then
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the bus driver must determine if the bus controller specified
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by ControllerHandle and the child controller specified
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by RemainingDevicePath are both supported by this
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bus driver.
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@retval EFI_SUCCESS The device specified by ControllerHandle and
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RemainingDevicePath is supported by the driver specified by This.
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@retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
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RemainingDevicePath is already being managed by the driver
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specified by This.
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@retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
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RemainingDevicePath is already being managed by a different
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driver or an application that requires exclusive access.
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Currently not implemented.
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@retval EFI_UNSUPPORTED The device specified by ControllerHandle and
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RemainingDevicePath is not supported by the driver specified by This.
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**/
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EFI_STATUS
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EFIAPI
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XenPvBlkDxeDriverBindingSupported (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
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)
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{
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EFI_STATUS Status;
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XENBUS_PROTOCOL *XenBusIo;
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Status = gBS->OpenProtocol (
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ControllerHandle,
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&gXenBusProtocolGuid,
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(VOID **)&XenBusIo,
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This->DriverBindingHandle,
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ControllerHandle,
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EFI_OPEN_PROTOCOL_BY_DRIVER
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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if (AsciiStrCmp (XenBusIo->Type, "vbd") == 0) {
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Status = EFI_SUCCESS;
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} else {
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Status = EFI_UNSUPPORTED;
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}
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gBS->CloseProtocol (ControllerHandle, &gXenBusProtocolGuid,
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This->DriverBindingHandle, ControllerHandle);
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return Status;
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}
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/**
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Starts a device controller.
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The Start() function is designed to be invoked from the EFI boot service ConnectController().
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As a result, much of the error checking on the parameters to Start() has been moved into this
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common boot service. It is legal to call Start() from other locations,
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but the following calling restrictions must be followed, or the system behavior will not be deterministic.
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1. ControllerHandle must be a valid EFI_HANDLE.
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2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
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EFI_DEVICE_PATH_PROTOCOL.
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3. Prior to calling Start(), the Supported() function for the driver specified by This must
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have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
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@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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@param[in] ControllerHandle The handle of the controller to start. This handle
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must support a protocol interface that supplies
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an I/O abstraction to the driver.
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@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
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parameter is ignored by device drivers, and is optional for bus
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drivers. For a bus driver, if this parameter is NULL, then handles
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for all the children of Controller are created by this driver.
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If this parameter is not NULL and the first Device Path Node is
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not the End of Device Path Node, then only the handle for the
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child device specified by the first Device Path Node of
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RemainingDevicePath is created by this driver.
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If the first Device Path Node of RemainingDevicePath is
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the End of Device Path Node, no child handle is created by this
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driver.
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@retval EFI_SUCCESS The device was started.
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@retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.
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@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
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@retval Others The driver failed to start the device.
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**/
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EFI_STATUS
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EFIAPI
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XenPvBlkDxeDriverBindingStart (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
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)
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{
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EFI_STATUS Status;
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XENBUS_PROTOCOL *XenBusIo;
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XEN_BLOCK_FRONT_DEVICE *Dev;
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EFI_BLOCK_IO_MEDIA *Media;
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Status = gBS->OpenProtocol (
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ControllerHandle,
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&gXenBusProtocolGuid,
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(VOID **)&XenBusIo,
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This->DriverBindingHandle,
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ControllerHandle,
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EFI_OPEN_PROTOCOL_BY_DRIVER
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Status = XenPvBlockFrontInitialization (XenBusIo, XenBusIo->Node, &Dev);
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if (EFI_ERROR (Status)) {
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goto CloseProtocol;
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}
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CopyMem (&Dev->BlockIo, &gXenPvBlkDxeBlockIo, sizeof (EFI_BLOCK_IO_PROTOCOL));
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Media = AllocateCopyPool (sizeof (EFI_BLOCK_IO_MEDIA),
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&gXenPvBlkDxeBlockIoMedia);
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if (Dev->MediaInfo.VDiskInfo & VDISK_REMOVABLE) {
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Media->RemovableMedia = TRUE;
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}
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Media->MediaPresent = TRUE;
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Media->ReadOnly = !Dev->MediaInfo.ReadWrite;
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if (Dev->MediaInfo.CdRom) {
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//
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// If it's a cdrom, the blocksize value need to be 2048 for OVMF to
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// recognize it as a cdrom:
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// MdeModulePkg/Universal/Disk/PartitionDxe/ElTorito.c
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//
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Media->BlockSize = 2048;
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Media->LastBlock = DivU64x32 (Dev->MediaInfo.Sectors,
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Media->BlockSize / Dev->MediaInfo.SectorSize) - 1;
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} else {
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Media->BlockSize = Dev->MediaInfo.SectorSize;
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Media->LastBlock = Dev->MediaInfo.Sectors - 1;
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}
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ASSERT (Media->BlockSize % 512 == 0);
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Dev->BlockIo.Media = Media;
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Status = gBS->InstallMultipleProtocolInterfaces (
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&ControllerHandle,
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&gEfiBlockIoProtocolGuid, &Dev->BlockIo,
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NULL
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "XenPvBlk: install protocol fail: %r\n", Status));
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goto UninitBlockFront;
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}
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return EFI_SUCCESS;
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UninitBlockFront:
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FreePool (Media);
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XenPvBlockFrontShutdown (Dev);
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CloseProtocol:
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gBS->CloseProtocol (ControllerHandle, &gXenBusProtocolGuid,
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This->DriverBindingHandle, ControllerHandle);
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return Status;
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}
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/**
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Stops a device controller.
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The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
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As a result, much of the error checking on the parameters to Stop() has been moved
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into this common boot service. It is legal to call Stop() from other locations,
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but the following calling restrictions must be followed, or the system behavior will not be deterministic.
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1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
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same driver's Start() function.
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2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
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EFI_HANDLE. In addition, all of these handles must have been created in this driver's
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Start() function, and the Start() function must have called OpenProtocol() on
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ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
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@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
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@param[in] ControllerHandle A handle to the device being stopped. The handle must
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support a bus specific I/O protocol for the driver
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to use to stop the device.
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@param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.
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@param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL
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if NumberOfChildren is 0.
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@retval EFI_SUCCESS The device was stopped.
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@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
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**/
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EFI_STATUS
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EFIAPI
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XenPvBlkDxeDriverBindingStop (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE ControllerHandle,
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IN UINTN NumberOfChildren,
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IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
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)
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{
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EFI_BLOCK_IO_PROTOCOL *BlockIo;
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XEN_BLOCK_FRONT_DEVICE *Dev;
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EFI_BLOCK_IO_MEDIA *Media;
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EFI_STATUS Status;
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Status = gBS->OpenProtocol (
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ControllerHandle, &gEfiBlockIoProtocolGuid,
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(VOID **)&BlockIo,
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This->DriverBindingHandle, ControllerHandle,
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EFI_OPEN_PROTOCOL_GET_PROTOCOL
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Status = gBS->UninstallProtocolInterface (ControllerHandle,
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&gEfiBlockIoProtocolGuid, BlockIo);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Media = BlockIo->Media;
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Dev = XEN_BLOCK_FRONT_FROM_BLOCK_IO (BlockIo);
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XenPvBlockFrontShutdown (Dev);
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FreePool (Media);
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gBS->CloseProtocol (ControllerHandle, &gXenBusProtocolGuid,
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This->DriverBindingHandle, ControllerHandle);
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return EFI_SUCCESS;
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}
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