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+/******************************************************************************
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+ * Talks to Xen Store to figure out what devices we have (backend half).
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+ *
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+ * Copyright (C) 2005 Rusty Russell, IBM Corporation
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+ * Copyright (C) 2005 Mike Wray, Hewlett-Packard
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+ * Copyright (C) 2005, 2006 XenSource Ltd
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+ * Copyright (C) 2007 Solarflare Communications, Inc.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License version 2
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+ * as published by the Free Software Foundation; or, when distributed
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+ * separately from the Linux kernel or incorporated into other
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+ * software packages, subject to the following license:
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this source file (the "Software"), to deal in the Software without
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+ * restriction, including without limitation the rights to use, copy, modify,
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+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
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+ * and to permit persons to whom the Software is furnished to do so, subject to
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+ * the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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+ * IN THE SOFTWARE.
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+ */
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+
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+#define DPRINTK(fmt, args...) \
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+ pr_debug("xenbus_probe (%s:%d) " fmt ".\n", \
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+ __func__, __LINE__, ##args)
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+
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+#include <linux/kernel.h>
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+#include <linux/err.h>
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+#include <linux/string.h>
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+#include <linux/ctype.h>
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+#include <linux/fcntl.h>
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+#include <linux/mm.h>
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+#include <linux/notifier.h>
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+
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+#include <asm/page.h>
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+#include <asm/pgtable.h>
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+#include <asm/xen/hypervisor.h>
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+#include <asm/hypervisor.h>
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+#include <xen/xenbus.h>
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+#include <xen/evtchn.h>
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+#include <xen/features.h>
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+
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+#include "xenbus_comms.h"
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+#include "xenbus_probe.h"
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+
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+/* backend/<type>/<fe-uuid>/<id> => <type>-<fe-domid>-<id> */
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+static int backend_bus_id(char bus_id[XEN_BUS_ID_SIZE], const char *nodename)
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+{
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+ int domid, err;
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+ const char *devid, *type, *frontend;
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+ unsigned int typelen;
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+
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+ type = strchr(nodename, '/');
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+ if (!type)
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+ return -EINVAL;
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+ type++;
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+ typelen = strcspn(type, "/");
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+ if (!typelen || type[typelen] != '/')
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+ return -EINVAL;
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+
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+ devid = strrchr(nodename, '/') + 1;
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+
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+ err = xenbus_gather(XBT_NIL, nodename, "frontend-id", "%i", &domid,
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+ "frontend", NULL, &frontend,
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+ NULL);
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+ if (err)
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+ return err;
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+ if (strlen(frontend) == 0)
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+ err = -ERANGE;
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+ if (!err && !xenbus_exists(XBT_NIL, frontend, ""))
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+ err = -ENOENT;
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+ kfree(frontend);
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+
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+ if (err)
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+ return err;
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+
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+ if (snprintf(bus_id, XEN_BUS_ID_SIZE,
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+ "%.*s-%i-%s", typelen, type, domid, devid) >= XEN_BUS_ID_SIZE)
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+ return -ENOSPC;
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+ return 0;
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+}
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+
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+static int xenbus_uevent_backend(struct device *dev,
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+ struct kobj_uevent_env *env)
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+{
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+ struct xenbus_device *xdev;
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+ struct xenbus_driver *drv;
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+ struct xen_bus_type *bus;
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+
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+ DPRINTK("");
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+
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+ if (dev == NULL)
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+ return -ENODEV;
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+
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+ xdev = to_xenbus_device(dev);
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+ bus = container_of(xdev->dev.bus, struct xen_bus_type, bus);
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+ if (xdev == NULL)
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+ return -ENODEV;
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+
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+ /* stuff we want to pass to /sbin/hotplug */
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+ if (add_uevent_var(env, "XENBUS_TYPE=%s", xdev->devicetype))
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+ return -ENOMEM;
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+
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+ if (add_uevent_var(env, "XENBUS_PATH=%s", xdev->nodename))
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+ return -ENOMEM;
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+
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+ if (add_uevent_var(env, "XENBUS_BASE_PATH=%s", bus->root))
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+ return -ENOMEM;
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+
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+ if (dev->driver) {
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+ drv = to_xenbus_driver(dev->driver);
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+ if (drv && drv->uevent)
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+ return drv->uevent(xdev, env);
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+ }
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+
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+ return 0;
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+}
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+
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+/* backend/<typename>/<frontend-uuid>/<name> */
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+static int xenbus_probe_backend_unit(struct xen_bus_type *bus,
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+ const char *dir,
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+ const char *type,
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+ const char *name)
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+{
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+ char *nodename;
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+ int err;
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+
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+ nodename = kasprintf(GFP_KERNEL, "%s/%s", dir, name);
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+ if (!nodename)
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+ return -ENOMEM;
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+
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+ DPRINTK("%s\n", nodename);
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+
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+ err = xenbus_probe_node(bus, type, nodename);
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+ kfree(nodename);
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+ return err;
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+}
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+
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+/* backend/<typename>/<frontend-domid> */
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+static int xenbus_probe_backend(struct xen_bus_type *bus, const char *type, const char *domid)
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+{
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+ char *nodename;
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+ int err = 0;
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+ char **dir;
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+ unsigned int i, dir_n = 0;
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+
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+ DPRINTK("");
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+
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+ nodename = kasprintf(GFP_KERNEL, "%s/%s/%s", bus->root, type, domid);
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+ if (!nodename)
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+ return -ENOMEM;
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+
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+ dir = xenbus_directory(XBT_NIL, nodename, "", &dir_n);
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+ if (IS_ERR(dir)) {
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+ kfree(nodename);
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+ return PTR_ERR(dir);
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+ }
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+
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+ for (i = 0; i < dir_n; i++) {
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+ err = xenbus_probe_backend_unit(bus, nodename, type, dir[i]);
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+ if (err)
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+ break;
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+ }
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+ kfree(dir);
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+ kfree(nodename);
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+ return err;
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+}
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+
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+static void frontend_changed(struct xenbus_watch *watch,
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+ const char **vec, unsigned int len)
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+{
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+ xenbus_otherend_changed(watch, vec, len, 0);
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+}
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+
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+static struct device_attribute xenbus_backend_dev_attrs[] = {
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+ __ATTR_NULL
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+};
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+
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+static struct xen_bus_type xenbus_backend = {
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+ .root = "backend",
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+ .levels = 3, /* backend/type/<frontend>/<id> */
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+ .get_bus_id = backend_bus_id,
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+ .probe = xenbus_probe_backend,
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+ .otherend_changed = frontend_changed,
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+ .bus = {
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+ .name = "xen-backend",
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+ .match = xenbus_match,
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+ .uevent = xenbus_uevent_backend,
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+ .probe = xenbus_dev_probe,
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+ .remove = xenbus_dev_remove,
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+ .shutdown = xenbus_dev_shutdown,
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+ .dev_attrs = xenbus_backend_dev_attrs,
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+ },
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+};
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+
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+static void backend_changed(struct xenbus_watch *watch,
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+ const char **vec, unsigned int len)
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+{
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+ DPRINTK("");
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+
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+ xenbus_dev_changed(vec[XS_WATCH_PATH], &xenbus_backend);
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+}
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+
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+static struct xenbus_watch be_watch = {
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+ .node = "backend",
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+ .callback = backend_changed,
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+};
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+
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+static int read_frontend_details(struct xenbus_device *xendev)
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+{
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+ return xenbus_read_otherend_details(xendev, "frontend-id", "frontend");
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+}
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+
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+//void xenbus_backend_suspend(int (*fn)(struct device *, void *))
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+//{
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+// DPRINTK("");
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+// bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, fn);
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+//}
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+
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+//void xenbus_backend_resume(int (*fn)(struct device *, void *))
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+//{
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+// DPRINTK("");
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+// bus_for_each_dev(&xenbus_backend.bus, NULL, NULL, fn);
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+//}
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+
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+//int xenbus_for_each_backend(void *arg, int (*fn)(struct device *, void *))
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+//{
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+// return bus_for_each_dev(&xenbus_backend.bus, NULL, arg, fn);
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+//}
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+//EXPORT_SYMBOL_GPL(xenbus_for_each_backend);
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+
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+int xenbus_dev_is_online(struct xenbus_device *dev)
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+{
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+ int rc, val;
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+
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+ rc = xenbus_scanf(XBT_NIL, dev->nodename, "online", "%d", &val);
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+ if (rc != 1)
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+ val = 0; /* no online node present */
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+
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+ return val;
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+}
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+EXPORT_SYMBOL_GPL(xenbus_dev_is_online);
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+
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+int __xenbus_register_backend(struct xenbus_driver *drv,
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+ struct module *owner, const char *mod_name)
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+{
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+ drv->read_otherend_details = read_frontend_details;
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+
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+ return xenbus_register_driver_common(drv, &xenbus_backend,
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+ owner, mod_name);
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+}
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+EXPORT_SYMBOL_GPL(__xenbus_register_backend);
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+
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+static int backend_probe_and_watch(struct notifier_block *notifier,
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+ unsigned long event,
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+ void *data)
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+{
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+ /* Enumerate devices in xenstore and watch for changes. */
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+ xenbus_probe_devices(&xenbus_backend);
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+ printk(KERN_CRIT "%s devices probed ok\n", __func__);
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+ register_xenbus_watch(&be_watch);
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+ printk(KERN_CRIT "%s watch add ok ok\n", __func__);
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+ printk(KERN_CRIT "%s all done\n", __func__);
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+ return NOTIFY_DONE;
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+}
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+
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+static int __init xenbus_probe_backend_init(void)
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+{
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+ static struct notifier_block xenstore_notifier = {
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+ .notifier_call = backend_probe_and_watch
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+ };
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+ int err;
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+
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+ DPRINTK("");
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+
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+ /* Register ourselves with the kernel bus subsystem */
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+ err = bus_register(&xenbus_backend.bus);
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+ if (err) {
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+ printk(KERN_CRIT "%s didn't register bus!\n", __func__);
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+ return err;
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+ }
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+ printk(KERN_CRIT "%s bus registered ok\n", __func__);
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+
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+ register_xenstore_notifier(&xenstore_notifier);
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+
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+ return 0;
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+}
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+
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+module_init(xenbus_probe_backend_init);
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Ian Campbell