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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Talks to Xen Store to figure out what devices we have.
*
* Copyright (C) 2005 Rusty Russell, IBM Corporation
* Copyright (C) 2005 Mike Wray, Hewlett-Packard
* Copyright (C) 2005 XenSource Ltd
*
* This file may be distributed separately from the Linux kernel, or
* incorporated into other software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifdef XPV_HVM_DRIVER
#include <sys/xpv_support.h>
#endif
#include <sys/hypervisor.h>
#include <xen/sys/xenbus_impl.h>
#include <xen/sys/xenbus_comms.h>
#include <xen/public/io/xs_wire.h>
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);
}
static int
read_backend_details(struct xenbus_device *xendev)
{
return (read_otherend_details(xendev, "backend-id", "backend"));
}
static int
read_frontend_details(struct xenbus_device *xendev)
{
return (read_otherend_details(xendev, "frontend-id", "frontend"));
}
static void
free_otherend_details(struct xenbus_device *dev)
{
if (dev->otherend != NULL) {
kmem_free((void *)dev->otherend, strlen(dev->otherend) + 1);
dev->otherend = NULL;
}
}
static void
free_otherend_watch(struct xenbus_device *dev)
{
if (dev->otherend_watch.node) {
unregister_xenbus_watch(&dev->otherend_watch);
kmem_free((void *)dev->otherend_watch.node,
strlen(dev->otherend_watch.node) + 1);
dev->otherend_watch.node = NULL;
}
}
/*ARGSUSED2*/
static void
otherend_changed(struct xenbus_watch *watch, const char **vec, unsigned int len)
{
struct xenbus_device *dev = watch->dev;
XenbusState state;
/*
* Protect us against watches firing on old details when the otherend
* details change, say immediately after a resume.
*/
if (!dev->otherend ||
strncmp(dev->otherend, vec[XS_WATCH_PATH], strlen(dev->otherend))) {
#if 0
printf("Ignoring watch at %s", vec[XS_WATCH_PATH]);
#endif
return;
}
state = xenbus_read_driver_state(dev->otherend);
#if 0
printf("state is %d, %s, %s",
state, dev->otherend_watch.node, vec[XS_WATCH_PATH]);
#endif
if (dev->otherend_changed)
dev->otherend_changed(dev, state);
}
int
talk_to_otherend(struct xenbus_device *dev)
{
int err;
free_otherend_watch(dev);
free_otherend_details(dev);
if (dev->frontend)
err = read_backend_details(dev);
else
err = read_frontend_details(dev);
if (err)
return (err);
dev->otherend_watch.dev = dev;
return (xenbus_watch_path2(dev, dev->otherend, "state",
&dev->otherend_watch, otherend_changed));
}
/*
* Local variables:
* c-file-style: "solaris"
* indent-tabs-mode: t
* c-indent-level: 8
* c-basic-offset: 8
* tab-width: 8
* End:
*/
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