/**
* Handler for all generic XenBus device systcl nodes.
*/
static int
xenbusb_device_sysctl_handler(SYSCTL_HANDLER_ARGS)
{
device_t dev;
const char *value;
dev = (device_t)arg1;
switch (arg2) {
case XENBUS_IVAR_NODE:
value = xenbus_get_node(dev);
break;
case XENBUS_IVAR_TYPE:
value = xenbus_get_type(dev);
break;
case XENBUS_IVAR_STATE:
value = xenbus_strstate(xenbus_get_state(dev));
break;
case XENBUS_IVAR_OTHEREND_ID:
return (sysctl_handle_int(oidp, NULL,
xenbus_get_otherend_id(dev),
req));
/* NOTREACHED */
case XENBUS_IVAR_OTHEREND_PATH:
value = xenbus_get_otherend_path(dev);
break;
default:
return (EINVAL);
}
return (SYSCTL_OUT_STR(req, value));
}
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);
}
int
xenbus_alloc_evtchn(device_t dev, evtchn_port_t *port)
{
struct evtchn_alloc_unbound alloc_unbound;
int err;
alloc_unbound.dom = DOMID_SELF;
alloc_unbound.remote_dom = xenbus_get_otherend_id(dev);
err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
&alloc_unbound);
if (err) {
xenbus_dev_fatal(dev, -err, "allocating event channel");
return (-err);
}
*port = alloc_unbound.port;
return (0);
}
