mirror of https://github.com/acidanthera/audk.git
OvmfPkg: VirtioNetDxe: driver binding
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14408 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Laszlo Ersek
jljusten
parent
bde8a2e0db
commit
16e0ece611
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@ -0,0 +1,674 @@
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/** @file
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Driver Binding code and its private helpers for the virtio-net driver.
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Copyright (C) 2013, Red Hat, Inc.
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <IndustryStandard/Pci.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DevicePathLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include "VirtioNet.h"
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#define RECEIVE_FILTERS_NO_MCAST ((UINT32) ( \
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EFI_SIMPLE_NETWORK_RECEIVE_UNICAST | \
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EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST | \
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EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS \
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))
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/*
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Temporarily enable then reset the virtio-net device in order to retrieve
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configuration values needed by Simple Network Protocol and Simple Network
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Mode fields.
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Only VirtioNetSnpPopulate() may call this function.
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If the function fails for any reason, the virtio-net device is moved to
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VSTAT_FAILED instead of being reset. This serves only informative purposes
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for the host side.
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param[in,out] Dev The VNET_DEV structure being created for
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the virtio-net device.
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param[out] MacAddress MAC address configured by the host.
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param[out] MediaPresentSupported Link status is made available by the host.
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param[out] MediaPresent If link status is made available by the
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host, the current link status is stored in
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*MediaPresent. Otherwise MediaPresent is
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unused.
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@retval EFI_UNSUPPORTED The host doesn't supply a MAC address.
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@return Status codes from Dev->PciIo->Io.Read(),
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VIRTIO_CFG_READ() and VIRTIO_CFG_WRITE().
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@retval EFI_SUCCESS Configuration values retrieved.
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*/
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STATIC
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EFI_STATUS
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EFIAPI
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VirtioNetGetFeatures (
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IN OUT VNET_DEV *Dev,
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OUT EFI_MAC_ADDRESS *MacAddress,
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OUT BOOLEAN *MediaPresentSupported,
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OUT BOOLEAN *MediaPresent
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)
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{
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EFI_STATUS Status;
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UINT8 NextDevStat;
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UINT32 Features;
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UINT16 LinkStatus;
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//
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// Interrogate the device for features (virtio-0.9.5, 2.2.1 Device
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// Initialization Sequence), but don't complete setting it up.
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//
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NextDevStat = 0; // step 1 -- reset device
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Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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NextDevStat |= VSTAT_ACK; // step 2 -- acknowledge device presence
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Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);
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if (EFI_ERROR (Status)) {
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goto YieldDevice;
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}
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NextDevStat |= VSTAT_DRIVER; // step 3 -- we know how to drive it
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Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);
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if (EFI_ERROR (Status)) {
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goto YieldDevice;
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}
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//
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// step 4a -- retrieve and validate features
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//
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Status = VIRTIO_CFG_READ (Dev, Generic.VhdrDeviceFeatureBits, &Features);
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if (EFI_ERROR (Status)) {
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goto YieldDevice;
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}
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//
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// get MAC address byte-wise
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//
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if ((Features & VIRTIO_NET_F_MAC) == 0) {
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Status = EFI_UNSUPPORTED;
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goto YieldDevice;
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}
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Status = Dev->PciIo->Io.Read (Dev->PciIo, // PciIo
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EfiPciIoWidthUint8, // Width
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PCI_BAR_IDX0, // BarIndex
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OFFSET_OF_VNET (VhdrMac), // Offset
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SIZE_OF_VNET (VhdrMac), // Count
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MacAddress // Buffer
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);
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if (EFI_ERROR (Status)) {
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goto YieldDevice;
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}
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//
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// check if link status is reported, and if so, what the link status is
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//
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if ((Features & VIRTIO_NET_F_STATUS) == 0) {
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*MediaPresentSupported = FALSE;
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}
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else {
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*MediaPresentSupported = TRUE;
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Status = VIRTIO_CFG_READ (Dev, VhdrLinkStatus, &LinkStatus);
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if (EFI_ERROR (Status)) {
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goto YieldDevice;
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}
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*MediaPresent = !!(LinkStatus & VIRTIO_NET_S_LINK_UP);
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}
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YieldDevice:
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VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus,
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EFI_ERROR (Status) ? VSTAT_FAILED : 0);
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return Status;
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}
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/**
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Set up the Simple Network Protocol fields, the Simple Network Mode fields,
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and the Exit Boot Services Event of the virtio-net driver instance.
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This function may only be called by VirtioNetDriverBindingStart().
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@param[in,out] Dev The VNET_DEV driver instance being created for the
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virtio-net device.
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@return Status codes from the CreateEvent() boot service or the
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VirtioNetGetFeatures() function.
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@retval EFI_SUCCESS Configuration successful.
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*/
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STATIC
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EFI_STATUS
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EFIAPI
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VirtioNetSnpPopulate (
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IN OUT VNET_DEV *Dev
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)
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{
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EFI_STATUS Status;
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//
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// We set up a function here that is asynchronously callable by an
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// external application to check if there are any packets available for
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// reception. The least urgent task priority level we can specify for such a
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// "software interrupt" is TPL_CALLBACK.
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//
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// TPL_CALLBACK is also the maximum TPL an SNP implementation is allowed to
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// run at (see 6.1 Event, Timer, and Task Priority Services in the UEFI
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// Specification 2.3.1+errC).
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//
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// Since we raise our TPL to TPL_CALLBACK in every single function that
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// accesses the device, and the external application also queues its interest
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// for received packets at the same TPL_CALLBACK, in effect the
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// VirtioNetIsPacketAvailable() function will never interrupt any
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// device-accessing driver function, it will be scheduled in isolation.
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//
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// TPL_CALLBACK (which basically this entire driver runs at) is allowed
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// for "[l]ong term operations (such as file system operations and disk
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// I/O)". Because none of our functions block, we'd satisfy an even stronger
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// requirement.
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//
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Status = gBS->CreateEvent (EVT_NOTIFY_WAIT, TPL_CALLBACK,
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&VirtioNetIsPacketAvailable, Dev, &Dev->Snp.WaitForPacket);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Dev->Snp.Revision = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION;
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Dev->Snp.Start = &VirtioNetStart;
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Dev->Snp.Stop = &VirtioNetStop;
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Dev->Snp.Initialize = &VirtioNetInitialize;
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Dev->Snp.Reset = &VirtioNetReset;
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Dev->Snp.Shutdown = &VirtioNetShutdown;
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Dev->Snp.ReceiveFilters = &VirtioNetReceiveFilters;
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Dev->Snp.StationAddress = &VirtioNetStationAddress;
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Dev->Snp.Statistics = &VirtioNetStatistics;
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Dev->Snp.MCastIpToMac = &VirtioNetMcastIpToMac;
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Dev->Snp.NvData = &VirtioNetNvData;
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Dev->Snp.GetStatus = &VirtioNetGetStatus;
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Dev->Snp.Transmit = &VirtioNetTransmit;
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Dev->Snp.Receive = &VirtioNetReceive;
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Dev->Snp.Mode = &Dev->Snm;
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Dev->Snm.State = EfiSimpleNetworkStopped;
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Dev->Snm.HwAddressSize = SIZE_OF_VNET (VhdrMac);
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Dev->Snm.MediaHeaderSize = SIZE_OF_VNET (VhdrMac) + // dst MAC
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SIZE_OF_VNET (VhdrMac) + // src MAC
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2; // Ethertype
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Dev->Snm.MaxPacketSize = 1500;
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Dev->Snm.NvRamSize = 0;
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Dev->Snm.NvRamAccessSize = 0;
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Dev->Snm.ReceiveFilterMask = RECEIVE_FILTERS_NO_MCAST;
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Dev->Snm.ReceiveFilterSetting = RECEIVE_FILTERS_NO_MCAST;
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Dev->Snm.MaxMCastFilterCount = 0;
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Dev->Snm.MCastFilterCount = 0;
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Dev->Snm.IfType = 1; // ethernet
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Dev->Snm.MacAddressChangeable = FALSE;
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Dev->Snm.MultipleTxSupported = TRUE;
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ASSERT (SIZE_OF_VNET (VhdrMac) <= sizeof (EFI_MAC_ADDRESS));
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Status = VirtioNetGetFeatures (Dev, &Dev->Snm.CurrentAddress,
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&Dev->Snm.MediaPresentSupported, &Dev->Snm.MediaPresent);
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if (EFI_ERROR (Status)) {
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goto CloseWaitForPacket;
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}
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CopyMem (&Dev->Snm.PermanentAddress, &Dev->Snm.CurrentAddress,
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SIZE_OF_VNET (VhdrMac));
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SetMem (&Dev->Snm.BroadcastAddress, SIZE_OF_VNET (VhdrMac), 0xFF);
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//
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// VirtioNetExitBoot() is queued by ExitBootServices(); its purpose is to
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// cancel any pending virtio requests. The TPL_CALLBACK reasoning is
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// identical to the one above. There's one difference: this kind of
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// event is "globally visible", which means it can be signalled as soon as
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// we create it. We haven't raised our TPL here, hence VirtioNetExitBoot()
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// could be entered immediately. VirtioNetExitBoot() checks Dev->Snm.State,
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// so we're safe.
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//
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Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_CALLBACK,
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&VirtioNetExitBoot, Dev, &Dev->ExitBoot);
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if (EFI_ERROR (Status)) {
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goto CloseWaitForPacket;
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}
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return EFI_SUCCESS;
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CloseWaitForPacket:
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gBS->CloseEvent (Dev->Snp.WaitForPacket);
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return Status;
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}
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/**
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Release any resources allocated by VirtioNetSnpPopulate().
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This function may only be called by VirtioNetDriverBindingStart(), when
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rolling back a partial, failed driver instance creation, and by
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VirtioNetDriverBindingStop(), when disconnecting a virtio-net device from the
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driver.
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@param[in,out] Dev The VNET_DEV driver instance being destroyed.
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*/
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STATIC
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VOID
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EFIAPI
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VirtioNetSnpEvacuate (
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IN OUT VNET_DEV *Dev
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)
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{
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//
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// This function runs either at TPL_CALLBACK already (from
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// VirtioNetDriverBindingStop()), or it is part of a teardown following
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// a partial, failed construction in VirtioNetDriverBindingStart(), when
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// WaitForPacket was never accessible to the world.
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//
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gBS->CloseEvent (Dev->ExitBoot);
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gBS->CloseEvent (Dev->Snp.WaitForPacket);
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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
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provided, it further tests to see if this driver supports creating a handle
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for the specified child device.
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This function checks to see if the driver specified by This supports the
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device specified by ControllerHandle. Drivers will typically use the device
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path attached to ControllerHandle and/or the services from the bus I/O
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abstraction attached to ControllerHandle to determine if the driver supports
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ControllerHandle. This function may be called many times during platform
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initialization. In order to reduce boot times, the tests performed by this
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function must be very small, and take as little time as possible to execute.
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This function must not change the state of any hardware devices, and this
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function must be aware that the device specified by ControllerHandle may
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already be managed by the same driver or a different driver. This function
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must match its calls to AllocatePages() with FreePages(), AllocatePool() with
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FreePool(), and OpenProtocol() with CloseProtocol(). Because ControllerHandle
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may have been previously started by the same driver, if a protocol is already
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in the opened state, then it must not be closed with CloseProtocol(). This is
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required to guarantee the state of ControllerHandle is not modified by this
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function.
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@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL
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instance.
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@param[in] ControllerHandle The handle of the controller to test. This
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handle must support a protocol interface
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that supplies an I/O abstraction to the
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driver.
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@param[in] RemainingDevicePath A pointer to the remaining portion of a
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device path. This parameter is ignored by
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device drivers, and is optional for bus
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drivers. For bus drivers, if this parameter
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is not NULL, then the bus driver must
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determine if the bus controller specified by
|
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ControllerHandle and the child controller
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specified by RemainingDevicePath are both
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supported by this bus driver.
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@retval EFI_SUCCESS The device specified by ControllerHandle and
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RemainingDevicePath is supported by the
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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
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by the driver 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
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by a different driver or an application that
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requires exclusive access. Currently not
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implemented.
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@retval EFI_UNSUPPORTED The device specified by ControllerHandle and
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RemainingDevicePath is not supported by the
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driver specified by This.
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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VirtioNetDriverBindingSupported (
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IN EFI_DRIVER_BINDING_PROTOCOL *This,
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IN EFI_HANDLE DeviceHandle,
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IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
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)
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{
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EFI_STATUS Status;
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EFI_PCI_IO_PROTOCOL *PciIo;
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PCI_TYPE00 Pci;
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Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
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(VOID **)&PciIo, This->DriverBindingHandle, DeviceHandle,
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EFI_OPEN_PROTOCOL_BY_DRIVER);
|
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if (EFI_ERROR (Status)) {
|
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return Status;
|
||||
}
|
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Status = PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, 0,
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sizeof Pci / sizeof (UINT32), &Pci);
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//
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// virtio-0.9.5, 2.1 PCI Discovery:
|
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// the network device has Subsystem Device ID 1
|
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//
|
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if (Status == EFI_SUCCESS) {
|
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Status = (Pci.Hdr.VendorId == 0x1AF4 &&
|
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Pci.Hdr.DeviceId >= 0x1000 && Pci.Hdr.DeviceId <= 0x103F &&
|
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Pci.Hdr.RevisionID == 0x00 &&
|
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Pci.Device.SubsystemID == 0x01) ? EFI_SUCCESS : EFI_UNSUPPORTED;
|
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}
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|
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gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
|
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This->DriverBindingHandle, DeviceHandle);
|
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return Status;
|
||||
}
|
||||
|
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|
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/**
|
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Starts a device controller or a bus controller.
|
||||
|
||||
The Start() function is designed to be invoked from the EFI boot service
|
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ConnectController(). As a result, much of the error checking on the
|
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parameters to Start() has been moved into this common boot service. It is
|
||||
legal to call Start() from other locations, but the following calling
|
||||
restrictions must be followed, or the system behavior will not be
|
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deterministic.
|
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1. ControllerHandle must be a valid EFI_HANDLE.
|
||||
2. If RemainingDevicePath is not NULL, then it must be a pointer to a
|
||||
naturally aligned EFI_DEVICE_PATH_PROTOCOL.
|
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3. Prior to calling Start(), the Supported() function for the driver
|
||||
specified by This must have been called with the same calling parameters,
|
||||
and Supported() must have returned EFI_SUCCESS.
|
||||
|
||||
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL
|
||||
instance.
|
||||
@param[in] ControllerHandle The handle of the controller to start. This
|
||||
handle must support a protocol interface
|
||||
that supplies an I/O abstraction to the
|
||||
driver.
|
||||
@param[in] RemainingDevicePath A pointer to the remaining portion of a
|
||||
device path. This parameter is ignored by
|
||||
device drivers, and is optional for bus
|
||||
drivers. For a bus driver, if this parameter
|
||||
is NULL, then handles for all the children
|
||||
of Controller are created by this driver.
|
||||
If this parameter is not NULL and the first
|
||||
Device Path Node is 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 RemainingDevicePath is created
|
||||
by this driver. If the first Device Path
|
||||
Node of RemainingDevicePath is the End of
|
||||
Device Path Node, no child handle is created
|
||||
by this driver.
|
||||
|
||||
@retval EFI_SUCCESS The device was started.
|
||||
@retval EFI_DEVICE_ERROR The device could not be started due to a
|
||||
device error.Currently not implemented.
|
||||
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a
|
||||
lack of resources.
|
||||
@retval Others The driver failded to start the device.
|
||||
|
||||
**/
|
||||
|
||||
STATIC
|
||||
EFI_STATUS
|
||||
EFIAPI
|
||||
VirtioNetDriverBindingStart (
|
||||
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
||||
IN EFI_HANDLE DeviceHandle,
|
||||
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
|
||||
)
|
||||
{
|
||||
EFI_STATUS Status;
|
||||
VNET_DEV *Dev;
|
||||
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
|
||||
MAC_ADDR_DEVICE_PATH MacNode;
|
||||
VOID *ChildPciIo;
|
||||
|
||||
//
|
||||
// allocate space for the driver instance
|
||||
//
|
||||
Dev = (VNET_DEV *) AllocateZeroPool (sizeof *Dev);
|
||||
if (Dev == NULL) {
|
||||
return EFI_OUT_OF_RESOURCES;
|
||||
}
|
||||
Dev->Signature = VNET_SIG;
|
||||
|
||||
//
|
||||
// get PCI access to the device and keep it open
|
||||
//
|
||||
Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
|
||||
(VOID **)&Dev->PciIo, This->DriverBindingHandle,
|
||||
DeviceHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto FreeVirtioNet;
|
||||
}
|
||||
|
||||
//
|
||||
// save original PCI attributes and enable IO space access
|
||||
//
|
||||
Status = Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationGet,
|
||||
0, &Dev->OrigPciAttributes);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto ClosePciIo;
|
||||
}
|
||||
|
||||
Status = Dev->PciIo->Attributes (Dev->PciIo,
|
||||
EfiPciIoAttributeOperationEnable,
|
||||
EFI_PCI_IO_ATTRIBUTE_IO, NULL);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto ClosePciIo;
|
||||
}
|
||||
|
||||
//
|
||||
// now we can run a basic one-shot virtio-net initialization required to
|
||||
// retrieve the MAC address
|
||||
//
|
||||
Status = VirtioNetSnpPopulate (Dev);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto RestorePciAttributes;
|
||||
}
|
||||
|
||||
//
|
||||
// get the device path of the virtio-net PCI device -- one-shot open
|
||||
//
|
||||
Status = gBS->OpenProtocol (DeviceHandle, &gEfiDevicePathProtocolGuid,
|
||||
(VOID **)&DevicePath, This->DriverBindingHandle,
|
||||
DeviceHandle, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto Evacuate;
|
||||
}
|
||||
|
||||
//
|
||||
// create another device path that has the MAC address appended
|
||||
//
|
||||
MacNode.Header.Type = MESSAGING_DEVICE_PATH;
|
||||
MacNode.Header.SubType = MSG_MAC_ADDR_DP;
|
||||
SetDevicePathNodeLength (&MacNode, sizeof MacNode);
|
||||
CopyMem (&MacNode.MacAddress, &Dev->Snm.CurrentAddress,
|
||||
sizeof (EFI_MAC_ADDRESS));
|
||||
MacNode.IfType = Dev->Snm.IfType;
|
||||
|
||||
Dev->MacDevicePath = AppendDevicePathNode (DevicePath, &MacNode.Header);
|
||||
if (Dev->MacDevicePath == NULL) {
|
||||
Status = EFI_OUT_OF_RESOURCES;
|
||||
goto Evacuate;
|
||||
}
|
||||
|
||||
//
|
||||
// create a child handle with the Simple Network Protocol and the new
|
||||
// device path installed on it
|
||||
//
|
||||
Status = gBS->InstallMultipleProtocolInterfaces (&Dev->MacHandle,
|
||||
&gEfiSimpleNetworkProtocolGuid, &Dev->Snp,
|
||||
&gEfiDevicePathProtocolGuid, Dev->MacDevicePath,
|
||||
NULL);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto FreeMacDevicePath;
|
||||
}
|
||||
|
||||
//
|
||||
// make a note that we keep this device open with PciIo for the sake of this
|
||||
// child
|
||||
//
|
||||
Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
|
||||
&ChildPciIo, This->DriverBindingHandle,
|
||||
Dev->MacHandle, EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER);
|
||||
if (EFI_ERROR (Status)) {
|
||||
goto UninstallMultiple;
|
||||
}
|
||||
|
||||
return EFI_SUCCESS;
|
||||
|
||||
UninstallMultiple:
|
||||
gBS->UninstallMultipleProtocolInterfaces (Dev->MacHandle,
|
||||
&gEfiDevicePathProtocolGuid, Dev->MacDevicePath,
|
||||
&gEfiSimpleNetworkProtocolGuid, &Dev->Snp,
|
||||
NULL);
|
||||
|
||||
FreeMacDevicePath:
|
||||
FreePool (Dev->MacDevicePath);
|
||||
|
||||
Evacuate:
|
||||
VirtioNetSnpEvacuate (Dev);
|
||||
|
||||
RestorePciAttributes:
|
||||
Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationSet,
|
||||
Dev->OrigPciAttributes, NULL);
|
||||
|
||||
ClosePciIo:
|
||||
gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
|
||||
This->DriverBindingHandle, DeviceHandle);
|
||||
|
||||
FreeVirtioNet:
|
||||
FreePool (Dev);
|
||||
|
||||
return Status;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
Stops a device controller or a bus controller.
|
||||
|
||||
The Stop() function is designed to be invoked from the EFI boot service
|
||||
DisconnectController(). As a result, much of the error checking on the
|
||||
parameters to Stop() has been moved into this common boot service. It is
|
||||
legal to call Stop() from other locations, but the following calling
|
||||
restrictions must be followed, or the system behavior will not be
|
||||
deterministic.
|
||||
1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous
|
||||
call to this same driver's Start() function.
|
||||
2. The first NumberOfChildren handles of ChildHandleBuffer must all be a
|
||||
valid EFI_HANDLE. In addition, all of these handles must have been created
|
||||
in this driver's Start() function, and the Start() function must have
|
||||
called OpenProtocol() on ControllerHandle with an Attribute of
|
||||
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
|
||||
|
||||
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL
|
||||
instance.
|
||||
@param[in] ControllerHandle A handle to the device being stopped. The
|
||||
handle must support a bus specific I/O
|
||||
protocol for the driver to use to stop the
|
||||
device.
|
||||
@param[in] NumberOfChildren The number of child device handles in
|
||||
ChildHandleBuffer.
|
||||
@param[in] ChildHandleBuffer An array of child handles to be freed. May be
|
||||
NULL if NumberOfChildren is 0.
|
||||
|
||||
@retval EFI_SUCCESS The device was stopped.
|
||||
@retval EFI_DEVICE_ERROR The device could not be stopped due to a device
|
||||
error.
|
||||
|
||||
**/
|
||||
STATIC
|
||||
EFI_STATUS
|
||||
EFIAPI
|
||||
VirtioNetDriverBindingStop (
|
||||
IN EFI_DRIVER_BINDING_PROTOCOL *This,
|
||||
IN EFI_HANDLE DeviceHandle,
|
||||
IN UINTN NumberOfChildren,
|
||||
IN EFI_HANDLE *ChildHandleBuffer
|
||||
)
|
||||
{
|
||||
if (NumberOfChildren > 0) {
|
||||
//
|
||||
// free all resources for whose access we need the child handle, because
|
||||
// the child handle is going away
|
||||
//
|
||||
EFI_STATUS Status;
|
||||
EFI_SIMPLE_NETWORK_PROTOCOL *Snp;
|
||||
VNET_DEV *Dev;
|
||||
EFI_TPL OldTpl;
|
||||
|
||||
ASSERT (NumberOfChildren == 1);
|
||||
|
||||
Status = gBS->OpenProtocol (ChildHandleBuffer[0],
|
||||
&gEfiSimpleNetworkProtocolGuid, (VOID **)&Snp,
|
||||
This->DriverBindingHandle, DeviceHandle,
|
||||
EFI_OPEN_PROTOCOL_GET_PROTOCOL);
|
||||
ASSERT_EFI_ERROR (Status);
|
||||
Dev = VIRTIO_NET_FROM_SNP (Snp);
|
||||
|
||||
//
|
||||
// prevent any interference with WaitForPacket
|
||||
//
|
||||
OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
|
||||
|
||||
ASSERT (Dev->MacHandle == ChildHandleBuffer[0]);
|
||||
if (Dev->Snm.State != EfiSimpleNetworkStopped) {
|
||||
//
|
||||
// device in use, cannot stop driver instance
|
||||
//
|
||||
Status = EFI_DEVICE_ERROR;
|
||||
}
|
||||
else {
|
||||
gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
|
||||
This->DriverBindingHandle, Dev->MacHandle);
|
||||
gBS->UninstallMultipleProtocolInterfaces (Dev->MacHandle,
|
||||
&gEfiDevicePathProtocolGuid, Dev->MacDevicePath,
|
||||
&gEfiSimpleNetworkProtocolGuid, &Dev->Snp,
|
||||
NULL);
|
||||
FreePool (Dev->MacDevicePath);
|
||||
VirtioNetSnpEvacuate (Dev);
|
||||
Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationSet,
|
||||
Dev->OrigPciAttributes, NULL);
|
||||
FreePool (Dev);
|
||||
}
|
||||
|
||||
gBS->RestoreTPL (OldTpl);
|
||||
return Status;
|
||||
}
|
||||
|
||||
//
|
||||
// release remaining resources, tied directly to the parent handle
|
||||
//
|
||||
gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
|
||||
This->DriverBindingHandle, DeviceHandle);
|
||||
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
|
||||
|
||||
EFI_DRIVER_BINDING_PROTOCOL gVirtioNetDriverBinding = {
|
||||
&VirtioNetDriverBindingSupported,
|
||||
&VirtioNetDriverBindingStart,
|
||||
&VirtioNetDriverBindingStop,
|
||||
0x10,
|
||||
NULL,
|
||||
NULL
|
||||
};
|
||||
Loading…
Reference in New Issue