static void connect(struct backend_info *be)
{
int err;
struct xenbus_device *dev = be->dev;
rtnl_lock();
err = xen_net_read_mac(dev, be->netif->fe_dev_addr);
if (err) {
xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
goto out;
}
xen_net_read_rate(dev, &be->netif->credit_bytes,
&be->netif->credit_usec);
be->netif->remaining_credit = be->netif->credit_bytes;
err = connect_rings(be);
if (err)
goto out;
/* May not get a kick from the frontend, so start the tx_queue now. */
if (!netbk_can_queue(be->netif->dev))
netif_wake_queue(be->netif->dev);
out:
rtnl_unlock();
}
static int tpmfront_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
struct tpm_private *priv;
int rv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating priv structure");
return -ENOMEM;
}
rv = setup_chip(&dev->dev, priv);
if (rv) {
kfree(priv);
return rv;
}
rv = setup_ring(dev, priv);
if (rv) {
tpm_remove_hardware(&dev->dev);
ring_free(priv);
return rv;
}
tpm_get_timeouts(priv->chip);
dev_set_drvdata(&dev->dev, priv->chip);
return rv;
}
static void backend_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
int val;
switch (backend_state) {
case XenbusStateInitialised:
case XenbusStateConnected:
if (dev->state == XenbusStateConnected)
break;
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-protocol-v2", "%d", &val) < 0)
val = 0;
if (!val) {
xenbus_dev_fatal(dev, -EINVAL,
"vTPM protocol 2 required");
return;
}
xenbus_switch_state(dev, XenbusStateConnected);
break;
case XenbusStateClosing:
case XenbusStateClosed:
device_unregister(&dev->dev);
xenbus_frontend_closed(dev);
break;
default:
break;
}
}
int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn)
{
int err = gnttab_grant_foreign_access(dev->otherend_id, ring_mfn, 0);
if (err < 0)
xenbus_dev_fatal(dev, err, "granting access to ring page");
return err;
}
/**
* Handle the creation of the hotplug script environment. We add the script
* and vif variables to the environment, for the benefit of the vif-* hotplug
* scripts.
*/
static int netback_uevent(struct xenbus_device *xdev, struct kobj_uevent_env *env)
{
struct backend_info *be = dev_get_drvdata(&xdev->dev);
char *val;
DPRINTK("netback_uevent");
val = xenbus_read(XBT_NIL, xdev->nodename, "script", NULL);
if (IS_ERR(val)) {
int err = PTR_ERR(val);
xenbus_dev_fatal(xdev, err, "reading script");
return err;
}
else {
if (add_uevent_var(env, "script=%s", val)) {
kfree(val);
return -ENOMEM;
}
kfree(val);
}
if (be && be->netif && add_uevent_var(env, "vif=%s", be->netif->dev->name))
return -ENOMEM;
return 0;
}
static void connect(struct backend_info *be)
{
int err;
struct xenbus_device *dev = be->dev;
err = connect_rings(be);
if (err)
return;
err = xen_net_read_mac(dev, be->netif->fe_dev_addr);
if (err) {
xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
return;
}
xen_net_read_rate(dev, &be->netif->credit_bytes,
&be->netif->credit_usec);
be->netif->remaining_credit = be->netif->credit_bytes;
unregister_hotplug_status_watch(be);
err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
hotplug_status_changed,
"%s/%s", dev->nodename, "hotplug-status");
if (err) {
/* Switch now, since we can't do a watch. */
xenbus_switch_state(dev, XenbusStateConnected);
} else {
be->have_hotplug_status_watch = 1;
}
netif_wake_queue(be->netif->dev);
}
/**
* Handle the creation of the hotplug script environment. We add the script
* and vif variables to the environment, for the benefit of the vif-* hotplug
* scripts.
*/
static int netback_uevent(struct xenbus_device *xdev, char **envp,
int num_envp, char *buffer, int buffer_size)
{
struct backend_info *be = xdev->dev.driver_data;
netif_t *netif = be->netif;
int i = 0, length = 0;
char *val;
DPRINTK("netback_uevent");
val = xenbus_read(XBT_NIL, xdev->nodename, "script", NULL);
if (IS_ERR(val)) {
int err = PTR_ERR(val);
xenbus_dev_fatal(xdev, err, "reading script");
return err;
}
else {
add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
&length, "script=%s", val);
kfree(val);
}
add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
"vif=%s", netif->dev->name);
envp[i] = NULL;
return 0;
}
/*
* Callback received when the frontend's state changes.
*/
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev_get_drvdata(&dev->dev);
int err;
DPRINTK("%s", xenbus_strstate(frontend_state));
switch (frontend_state) {
case XenbusStateInitialising:
if (dev->state == XenbusStateClosed) {
pr_info(DRV_PFX "%s: prepare for reconnect\n",
dev->nodename);
xenbus_switch_state(dev, XenbusStateInitWait);
}
break;
case XenbusStateInitialised:
case XenbusStateConnected:
/*
* Ensure we connect even when two watches fire in
* close succession and we miss the intermediate value
* of frontend_state.
*/
if (dev->state == XenbusStateConnected)
break;
/*
* Enforce precondition before potential leak point.
* xen_blkif_disconnect() is idempotent.
*/
xen_blkif_disconnect(be->blkif);
err = connect_ring(be);
if (err)
break;
xen_update_blkif_status(be->blkif);
break;
case XenbusStateClosing:
xenbus_switch_state(dev, XenbusStateClosing);
break;
case XenbusStateClosed:
xen_blkif_disconnect(be->blkif);
xenbus_switch_state(dev, XenbusStateClosed);
if (xenbus_dev_is_online(dev))
break;
/* fall through if not online */
case XenbusStateUnknown:
/* implies xen_blkif_disconnect() via xen_blkbk_remove() */
device_unregister(&dev->dev);
break;
default:
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
frontend_state);
break;
}
}
static int xen_pcibk_xenbus_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int err = 0;
struct xen_pcibk_device *pdev = alloc_pdev(dev);
if (pdev == NULL) {
err = -ENOMEM;
xenbus_dev_fatal(dev, err,
"Error allocating xen_pcibk_device struct");
goto out;
}
/* wait for xend to configure us */
err = xenbus_switch_state(dev, XenbusStateInitWait);
if (err)
goto out;
/* watch the backend node for backend configuration information */
err = xenbus_watch_path(dev, dev->nodename, &pdev->be_watch,
xen_pcibk_be_watch);
if (err)
goto out;
pdev->be_watching = 1;
/* We need to force a call to our callback here in case
* xend already configured us!
*/
xen_pcibk_be_watch(&pdev->be_watch, NULL, 0);
out:
return err;
}
static int connect_ring(struct backend_info *be)
{
struct xenbus_device *dev = be->dev;
unsigned long ring_ref;
unsigned int evtchn;
char protocol[64] = "";
int err;
DPRINTK("%s", dev->otherend);
err = xenbus_gather(XBT_NIL, dev->otherend, "ring-ref", "%lu",
&ring_ref, "event-channel", "%u", &evtchn, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-ref and event-channel",
dev->otherend);
return err;
}
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",
"%63s", protocol, NULL);
if (err)
strcpy(protocol, "unspecified, assuming native");
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE))
be->blkif->blk_protocol = BLKIF_PROTOCOL_NATIVE;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_32))
be->blkif->blk_protocol = BLKIF_PROTOCOL_X86_32;
else if (0 == strcmp(protocol, XEN_IO_PROTO_ABI_X86_64))
be->blkif->blk_protocol = BLKIF_PROTOCOL_X86_64;
else {
xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);
return -1;
}
pr_info(DRV_PFX "ring-ref %ld, event-channel %d, protocol %d (%s)\n",
ring_ref, evtchn, be->blkif->blk_protocol, protocol);
/* Map the shared frame, irq etc. */
err = xen_blkif_map(be->blkif, ring_ref, evtchn);
if (err) {
xenbus_dev_fatal(dev, err, "mapping ring-ref %lu port %u",
ring_ref, evtchn);
return err;
}
return 0;
}
/**
* Entry point to this code when a new device is created. Allocate the basic
* structures and the ring buffer for communication with the backend, and
* inform the backend of the appropriate details for those. Switch to
* Initialised state.
*/
static int ixpfront_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int err, vdevice, i;
struct ixpfront_info *info;
/* FIXME: Use dynamic device id if this is not set. */
err = xenbus_scanf(XBT_NIL, dev->nodename,
"virtual-device", "%i", &vdevice);
if (err != 1) {
/* go looking in the extended area instead */
err = xenbus_scanf(XBT_NIL, dev->nodename, "virtual-device-ext",
"%i", &vdevice);
if (err != 1) {
xenbus_dev_fatal(dev, err, "reading virtual-device");
return err;
}
}
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
return -ENOMEM;
}
info->xbdev = dev;
info->vdevice = vdevice;
info->connected = IXP_STATE_DISCONNECTED;
for (i = 0; i < IXP_RING_SIZE; i++)
info->shadow[i].req.id = i+1;
info->shadow[IXP_RING_SIZE-1].req.id = 0x0fffffff;
/* Front end dir is a number, which is used as the id. */
info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
dev_set_drvdata(&dev->dev, info);
err = talk_to_ixpback(dev, info);
if (err) {
kfree(info);
dev_set_drvdata(&dev->dev, NULL);
return err;
}
return 0;
}
/**
* Callback received when the frontend's state changes.
*/
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev_get_drvdata(&dev->dev);
pr_debug("frontend state %s", xenbus_strstate(frontend_state));
be->frontend_state = frontend_state;
switch (frontend_state) {
case XenbusStateInitialising:
if (dev->state == XenbusStateClosed) {
printk(KERN_INFO "%s: %s: prepare for reconnect\n",
__func__, dev->nodename);
xenbus_switch_state(dev, XenbusStateInitWait);
}
break;
case XenbusStateInitialised:
break;
case XenbusStateConnected:
if (dev->state == XenbusStateConnected)
break;
backend_create_xenvif(be);
if (be->vif)
connect(be);
#ifdef DNP_XEN
be->vif->assigned_dnpVF_ID = -1;
be->vif->dnp_net_device = NULL;
register_vif(be->vif);
//Below only need if I want to start with bridge
//switch_vif_netif(be->vif->domid,1);
#endif
break;
case XenbusStateClosing:
if (be->vif)
kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE);
disconnect_backend(dev);
xenbus_switch_state(dev, XenbusStateClosing);
break;
case XenbusStateClosed:
xenbus_switch_state(dev, XenbusStateClosed);
if (xenbus_dev_is_online(dev))
break;
/* fall through if not online */
case XenbusStateUnknown:
device_unregister(&dev->dev);
break;
default:
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
frontend_state);
break;
}
}
static int xenkbd_connect_backend(struct xenbus_device *dev,
struct xenkbd_info *info)
{
int ret;
struct xenbus_transaction xbt;
ret = bind_listening_port_to_irqhandler(
dev->otherend_id, input_handler, 0, "xenkbd", info);
if (ret < 0) {
xenbus_dev_fatal(dev, ret,
"bind_listening_port_to_irqhandler");
return ret;
}
info->irq = ret;
again:
ret = xenbus_transaction_start(&xbt);
if (ret) {
xenbus_dev_fatal(dev, ret, "starting transaction");
return ret;
}
ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
virt_to_mfn(info->page));
if (ret)
goto error_xenbus;
ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
irq_to_evtchn_port(info->irq));
if (ret)
goto error_xenbus;
ret = xenbus_transaction_end(xbt, 0);
if (ret) {
if (ret == -EAGAIN)
goto again;
xenbus_dev_fatal(dev, ret, "completing transaction");
return ret;
}
xenbus_switch_state(dev, XenbusStateInitialised);
return 0;
error_xenbus:
xenbus_transaction_end(xbt, 1);
xenbus_dev_fatal(dev, ret, "writing xenstore");
return ret;
}
static int setup_ixpring(struct xenbus_device *dev,
struct ixpfront_info *info)
{
struct ixp_sring *sring;
int err;
info->ring_ref = GRANT_INVALID_REF;
sring = (struct ixp_sring *)__get_free_page(GFP_NOIO | __GFP_HIGH);
if (!sring) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring");
return -ENOMEM;
}
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
if (err < 0) {
free_page((unsigned long)sring);
info->ring.sring = NULL;
goto fail;
}
info->ring_ref = err;
err = xenbus_alloc_evtchn(dev, &info->evtchn);
if (err)
goto fail;
err = bind_evtchn_to_irqhandler(info->evtchn,
ixp_interrupt,
IRQF_SAMPLE_RANDOM, "ixp", info);
if (err <= 0) {
xenbus_dev_fatal(dev, err,
"bind_evtchn_to_irqhandler failed");
goto fail;
}
info->irq = err;
return 0;
fail:
ixp_free(info, 0);
return err;
}
int
xenbus_grant_ring(struct xenbus_device *dev, paddr_t ring_pa,
grant_ref_t *entryp)
{
int err = xengnt_grant_access(dev->xbusd_otherend_id, ring_pa,
0, entryp);
if (err != 0)
xenbus_dev_fatal(dev, err, "granting access to ring page");
return err;
}
/*
* Entry point to this code when a new device is created. Allocate the basic
* structures, and watch the store waiting for the hotplug scripts to tell us
* the device's physical major and minor numbers. Switch to InitWait.
*/
static int xen_blkbk_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int err;
struct backend_info *be = kzalloc(sizeof(struct backend_info),
GFP_KERNEL);
if (!be) {
xenbus_dev_fatal(dev, -ENOMEM,
"allocating backend structure");
return -ENOMEM;
}
be->dev = dev;
dev_set_drvdata(&dev->dev, be);
be->blkif = xen_blkif_alloc(dev->otherend_id);
if (IS_ERR(be->blkif)) {
err = PTR_ERR(be->blkif);
be->blkif = NULL;
xenbus_dev_fatal(dev, err, "creating block interface");
goto fail;
}
/* setup back pointer */
be->blkif->be = be;
err = xenbus_watch_pathfmt(dev, &be->backend_watch, backend_changed,
"%s/%s", dev->nodename, "physical-device");
if (err)
goto fail;
err = xenbus_switch_state(dev, XenbusStateInitWait);
if (err)
goto fail;
return 0;
fail:
DPRINTK("failed");
xen_blkbk_remove(dev);
return err;
}
static int connect_ctrl_ring(struct backend_info *be)
{
struct xenbus_device *dev = be->dev;
struct xenvif *vif = be->vif;
unsigned int val;
grant_ref_t ring_ref;
unsigned int evtchn;
int err;
err = xenbus_gather(XBT_NIL, dev->otherend,
"ctrl-ring-ref", "%u", &val, NULL);
if (err)
goto done; /* The frontend does not have a control ring */
ring_ref = val;
err = xenbus_gather(XBT_NIL, dev->otherend,
"event-channel-ctrl", "%u", &val, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/event-channel-ctrl",
dev->otherend);
goto fail;
}
evtchn = val;
err = xenvif_connect_ctrl(vif, ring_ref, evtchn);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frame %u port %u",
ring_ref, evtchn);
goto fail;
}
done:
return 0;
fail:
return err;
}
static void frontend_changed(struct xenbus_device *dev, enum xenbus_state frontend_state)
{
struct backend_info *be = dev_get_drvdata(&dev->dev);
printk("\nxen: dom0:otherend id, frontend state: %s", xenbus_strstate(frontend_state));
be->frontend_state = frontend_state;
switch(frontend_state){
case XenbusStateInitialising:{
if (dev->state == XenbusStateClosed) {
printk("\nxen: dom0: %s prepare for reconnect", dev->nodename);
xenbus_switch_state(dev, XenbusStateInitWait);
}
printk("\nxen: dom0: state changed to XenbusStateInitialising");
break;
}
case XenbusStateInitialised:
printk("\nxen: dom0: front state is XenbusStateInitiallised");
if(be->chrif)
connect(be);
xen_chrif_thread(be->chrif);
break;
case XenbusStateConnected:
// if (dev->state == XenbusStateConnected)
// break;
//map page here
printk("\nxen: dom0: front state XenbusStateConnected");
break;
case XenbusStateClosing:
xenbus_switch_state(dev, XenbusStateClosing);
printk("\nxen: dom0: state changed to XenbusStateClosing");
break;
case XenbusStateClosed:
//xen_chrif_disconnect(be->chrif);
xenbus_switch_state(dev, XenbusStateClosed);
printk("\nxen: dom0: state changed to XenbusStateClosed");
if (xenbus_dev_is_online(dev))
break;
case XenbusStateUnknown:
//device_unregister(&dev->dev);
printk("\nxen: dom0: state Unknown");
break;
default:
xenbus_dev_fatal(dev, -EINVAL, "default saw state %d at frontend", frontend_state);
break;
}
}
/**
* Callback received when the frontend's state changes.
*/
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev->dev.driver_data;
DPRINTK("%s", xenbus_strstate(frontend_state));
be->frontend_state = frontend_state;
switch (frontend_state) {
case XenbusStateInitialising:
if (dev->state == XenbusStateClosed) {
printk("%s: %s: prepare for reconnect\n",
__FUNCTION__, dev->nodename);
if (be->netif) {
netif_disconnect(be->netif);
be->netif = NULL;
}
xenbus_switch_state(dev, XenbusStateInitWait);
}
break;
case XenbusStateInitialised:
break;
case XenbusStateConnected:
backend_create_netif(be);
if (be->netif)
connect(be);
break;
case XenbusStateClosing:
xenbus_switch_state(dev, XenbusStateClosing);
break;
case XenbusStateClosed:
xenbus_switch_state(dev, XenbusStateClosed);
if (xenbus_dev_is_online(dev))
break;
/* fall through if not online */
case XenbusStateUnknown:
if (be->netif != NULL)
kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE);
device_unregister(&dev->dev);
break;
default:
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
frontend_state);
break;
}
}
/**
* Callback received when the hotplug scripts have placed the handle node.
* Read it, and create a netif structure. If the frontend is ready, connect.
*/
static void backend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
{
int err;
long handle;
struct backend_info *be
= container_of(watch, struct backend_info, backend_watch);
struct xenbus_device *dev = be->dev;
DPRINTK("");
err = xenbus_scanf(XBT_NULL, dev->nodename, "handle", "%li", &handle);
if (XENBUS_EXIST_ERR(err)) {
/* Since this watch will fire once immediately after it is
registered, we expect this. Ignore it, and wait for the
hotplug scripts. */
return;
}
if (err != 1) {
xenbus_dev_fatal(dev, err, "reading handle");
return;
}
if (be->netif == NULL) {
u8 be_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
be->netif = netif_alloc(dev->otherend_id, handle, be_mac);
if (IS_ERR(be->netif)) {
err = PTR_ERR(be->netif);
be->netif = NULL;
xenbus_dev_fatal(dev, err, "creating interface");
return;
}
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
maybe_connect(be);
}
}
static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
int remote_evtchn)
{
int err = 0;
void *vaddr;
dev_dbg(&pdev->xdev->dev,
"Attaching to frontend resources - gnt_ref=%d evtchn=%d\n",
gnt_ref, remote_evtchn);
err = xenbus_map_ring_valloc(pdev->xdev, gnt_ref, &vaddr);
if (err < 0) {
xenbus_dev_fatal(pdev->xdev, err,
"Error mapping other domain page in ours.");
goto out;
}
spin_lock(&pdev->dev_lock);
pdev->sh_info = vaddr;
spin_unlock(&pdev->dev_lock);
err = bind_interdomain_evtchn_to_irqhandler(
pdev->xdev->otherend_id, remote_evtchn, xen_pcibk_handle_event,
0, DRV_NAME, pdev);
if (err < 0) {
xenbus_dev_fatal(pdev->xdev, err,
"Error binding event channel to IRQ");
goto out;
}
spin_lock(&pdev->dev_lock);
pdev->evtchn_irq = err;
spin_unlock(&pdev->dev_lock);
err = 0;
dev_dbg(&pdev->xdev->dev, "Attached!\n");
out:
return err;
}
int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
struct backend_info *be, int state)
{
struct xenbus_device *dev = be->dev;
int err;
err = xenbus_printf(xbt, dev->nodename, "feature-flush-cache",
"%d", state);
if (err)
xenbus_dev_fatal(dev, err, "writing feature-flush-cache");
return err;
}
/**
* Callback received when the frontend's state changes.
*/
static void frontend_changed(struct xenbus_device *dev,
enum xenbus_state frontend_state)
{
struct backend_info *be = dev_get_drvdata(&dev->dev);
pr_debug("frontend state %s", xenbus_strstate(frontend_state));
be->frontend_state = frontend_state;
switch (frontend_state) {
case XenbusStateInitialising:
if (dev->state == XenbusStateClosed) {
// printk(KERN_INFO "%s: %s: prepare for reconnect\n",
;
xenbus_switch_state(dev, XenbusStateInitWait);
}
break;
case XenbusStateInitialised:
break;
case XenbusStateConnected:
if (dev->state == XenbusStateConnected)
break;
backend_create_xenvif(be);
if (be->vif)
connect(be);
break;
case XenbusStateClosing:
if (be->vif)
kobject_uevent(&dev->dev.kobj, KOBJ_OFFLINE);
disconnect_backend(dev);
xenbus_switch_state(dev, XenbusStateClosing);
break;
case XenbusStateClosed:
xenbus_switch_state(dev, XenbusStateClosed);
if (xenbus_dev_is_online(dev))
break;
/* fall through if not online */
case XenbusStateUnknown:
device_unregister(&dev->dev);
break;
default:
xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
frontend_state);
break;
}
}
int
xenbus_grant_ring(device_t dev, unsigned long ring_mfn, grant_ref_t *refp)
{
int error;
error = gnttab_grant_foreign_access(
xenbus_get_otherend_id(dev), ring_mfn, 0, refp);
if (error) {
xenbus_dev_fatal(dev, error, "granting access to ring page");
return (error);
}
return (0);
}
static int usbfront_probe(struct xenbus_device *dev,
const struct xenbus_device_id *id)
{
int err;
struct usb_hcd *hcd;
struct usbfront_info *info;
if (usb_disabled())
return -ENODEV;
hcd = create_hcd(dev);
if (IS_ERR(hcd)) {
err = PTR_ERR(hcd);
xenbus_dev_fatal(dev, err,
"fail to create usb host controller");
goto fail;
}
info = hcd_to_info(hcd);
dev->dev.driver_data = info;
err = usb_add_hcd(hcd, 0, 0);
if (err != 0) {
xenbus_dev_fatal(dev, err,
"fail to adding USB host controller");
goto fail;
}
init_waitqueue_head(&info->wq);
return 0;
fail:
usb_put_hcd(hcd);
dev->dev.driver_data = NULL;
return err;
}
static int
read_otherend_details(struct xenbus_device *xendev,
char *id_node, char *path_node)
{
int err = xenbus_gather(XBT_NULL, xendev->nodename,
id_node, "%i", &xendev->otherend_id, path_node, NULL,
&xendev->otherend, NULL);
if (err) {
xenbus_dev_fatal(xendev, err,
"reading other end details from %s", xendev->nodename);
return (err);
}
if (strlen(xendev->otherend) == 0 ||
!xenbus_exists_dir(xendev->otherend, "")) {
xenbus_dev_fatal(xendev, X_ENOENT, "missing other end from %s",
xendev->nodename);
kmem_free((void *)xendev->otherend,
strlen(xendev->otherend) + 1);
xendev->otherend = NULL;
return (X_ENOENT);
}
return (0);
}
/**
* Write the physical details regarding the block device to the store, and
* switch to Connected state.
*/
static void connect(struct backend_info *be)
{
xenbus_transaction_t xbt;
int err;
struct xenbus_device *dev = be->dev;
DPRINTK("%s", dev->otherend);
/* Supply the information about the device the frontend needs */
again:
err = xenbus_transaction_start(&xbt);
if (err) {
xenbus_dev_fatal(dev, err, "starting transaction");
return;
}
err = xenbus_printf(xbt, dev->nodename, "sectors", "%lu",
vbd_size(&be->blkif->vbd));
if (err) {
xenbus_dev_fatal(dev, err, "writing %s/sectors",
dev->nodename);
goto abort;
}
/* FIXME: use a typename instead */
err = xenbus_printf(xbt, dev->nodename, "info", "%u",
vbd_info(&be->blkif->vbd));
if (err) {
xenbus_dev_fatal(dev, err, "writing %s/info",
dev->nodename);
goto abort;
}
err = xenbus_printf(xbt, dev->nodename, "sector-size", "%lu",
vbd_secsize(&be->blkif->vbd));
if (err) {
xenbus_dev_fatal(dev, err, "writing %s/sector-size",
dev->nodename);
goto abort;
}
err = xenbus_transaction_end(xbt, 0);
if (err == -EAGAIN)
goto again;
if (err)
xenbus_dev_fatal(dev, err, "ending transaction");
err = xenbus_switch_state(dev, XenbusStateConnected);
if (err)
xenbus_dev_fatal(dev, err, "switching to Connected state",
dev->nodename);
return;
abort:
xenbus_transaction_end(xbt, 1);
}
static int read_xenbus_vif_flags(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned int rx_copy;
int err;
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) {
/* - Reduce drain timeout to poll more frequently for
* Rx requests.
* - Disable Rx stall detection.
*/
be->vif->drain_timeout = msecs_to_jiffies(30);
be->vif->stall_timeout = 0;
}
vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0);
vif->gso_mask = 0;
if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0))
vif->gso_mask |= GSO_BIT(TCPV4);
if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0))
vif->gso_mask |= GSO_BIT(TCPV6);
vif->ip_csum = !xenbus_read_unsigned(dev->otherend,
"feature-no-csum-offload", 0);
vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend,
"feature-ipv6-csum-offload", 0);
return 0;
}
static int xen_pcibk_export_device(struct xen_pcibk_device *pdev,
int domain, int bus, int slot, int func,
int devid)
{
struct pci_dev *dev;
int err = 0;
dev_dbg(&pdev->xdev->dev, "exporting dom %x bus %x slot %x func %x\n",
domain, bus, slot, func);
dev = pcistub_get_pci_dev_by_slot(pdev, domain, bus, slot, func);
if (!dev) {
err = -EINVAL;
xenbus_dev_fatal(pdev->xdev, err,
"Couldn't locate PCI device "
"(%04x:%02x:%02x.%01x)! "
"perhaps already in-use?",
domain, bus, slot, func);
goto out;
}
err = xen_pcibk_add_pci_dev(pdev, dev, devid,
xen_pcibk_publish_pci_dev);
if (err)
goto out;
dev_dbg(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id);
dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
if (xen_register_device_domain_owner(dev,
pdev->xdev->otherend_id) != 0) {
dev_err(&dev->dev, "device has been assigned to another " \
"domain! Over-writting the ownership, but beware.\n");
xen_unregister_device_domain_owner(dev);
xen_register_device_domain_owner(dev, pdev->xdev->otherend_id);
}
/* TODO: It'd be nice to export a bridge and have all of its children
* get exported with it. This may be best done in xend (which will
* have to calculate resource usage anyway) but we probably want to
* put something in here to ensure that if a bridge gets given to a
* driver domain, that all devices under that bridge are not given
* to other driver domains (as he who controls the bridge can disable
* it and stop the other devices from working).
*/
out:
return err;
}
/**
* Allocate an event channel for the given xenbus_device, assigning the newly
* created local port to *port. Return 0 on success, or -errno on error. On
* error, the device will switch to XenbusStateClosing, and the error will be
* saved in the store.
*/
int xenbus_alloc_evtchn(struct xenbus_device *dev, int *port)
{
struct evtchn_alloc_unbound alloc_unbound;
int err;
alloc_unbound.dom = DOMID_SELF;
alloc_unbound.remote_dom = dev->otherend_id;
err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
&alloc_unbound);
if (err)
xenbus_dev_fatal(dev, err, "allocating event channel");
else
*port = alloc_unbound.port;
return err;
}
