5  * Copyright (C) 2005 Mike Wray, Hewlett-Packard
41 #include <linux/err.h>
58 /* backend/<type>/<fe-uuid>/<id> => <type>-<fe-domid>-<id> */
61 	int domid, err;  in backend_bus_id()  local
67 		return -EINVAL;  in backend_bus_id()
71 		return -EINVAL;  in backend_bus_id()
75 	err = xenbus_gather(XBT_NIL, nodename, "frontend-id", "%i", &domid,  in backend_bus_id()
78 	if (err)  in backend_bus_id()
79 		return err;  in backend_bus_id()
81 		err = -ERANGE;  in backend_bus_id()
82 	if (!err && !xenbus_exists(XBT_NIL, frontend, ""))  in backend_bus_id()
83 		err = -ENOENT;  in backend_bus_id()
86 	if (err)  in backend_bus_id()
87 		return err;  in backend_bus_id()
89 	if (snprintf(bus_id, XEN_BUS_ID_SIZE, "%.*s-%i-%s",  in backend_bus_id()
91 		return -ENOSPC;  in backend_bus_id()
100 	const struct xen_bus_type *bus;  in xenbus_uevent_backend()  local
105 		return -ENODEV;  in xenbus_uevent_backend()
108 	bus = container_of(xdev->dev.bus, struct xen_bus_type, bus);  in xenbus_uevent_backend()
110 	if (add_uevent_var(env, "MODALIAS=xen-backend:%s", xdev->devicetype))  in xenbus_uevent_backend()
111 		return -ENOMEM;  in xenbus_uevent_backend()
114 	if (add_uevent_var(env, "XENBUS_TYPE=%s", xdev->devicetype))  in xenbus_uevent_backend()
115 		return -ENOMEM;  in xenbus_uevent_backend()
117 	if (add_uevent_var(env, "XENBUS_PATH=%s", xdev->nodename))  in xenbus_uevent_backend()
118 		return -ENOMEM;  in xenbus_uevent_backend()
120 	if (add_uevent_var(env, "XENBUS_BASE_PATH=%s", bus->root))  in xenbus_uevent_backend()
121 		return -ENOMEM;  in xenbus_uevent_backend()
123 	if (dev->driver) {  in xenbus_uevent_backend()
124 		drv = to_xenbus_driver(dev->driver);  in xenbus_uevent_backend()
125 		if (drv && drv->uevent)  in xenbus_uevent_backend()
126 			return drv->uevent(xdev, env);  in xenbus_uevent_backend()
132 /* backend/<typename>/<frontend-uuid>/<name> */
133 static int xenbus_probe_backend_unit(struct xen_bus_type *bus,  in xenbus_probe_backend_unit()  argument
139 	int err;  in xenbus_probe_backend_unit()  local
143 		return -ENOMEM;  in xenbus_probe_backend_unit()
147 	err = xenbus_probe_node(bus, type, nodename);  in xenbus_probe_backend_unit()
149 	return err;  in xenbus_probe_backend_unit()
152 /* backend/<typename>/<frontend-domid> */
153 static int xenbus_probe_backend(struct xen_bus_type *bus, const char *type,  in xenbus_probe_backend()  argument
157 	int err = 0;  in xenbus_probe_backend()  local
163 	nodename = kasprintf(GFP_KERNEL, "%s/%s/%s", bus->root, type, domid);  in xenbus_probe_backend()
165 		return -ENOMEM;  in xenbus_probe_backend()
174 		err = xenbus_probe_backend_unit(bus, nodename, type, dir[i]);  in xenbus_probe_backend()
175 		if (err)  in xenbus_probe_backend()
180 	return err;  in xenbus_probe_backend()
186 	return watch->nr_pending == 0;  in frontend_will_handle()
202 	.bus = {
203 		.name		= "xen-backend",
227 	return xenbus_read_otherend_details(xendev, "frontend-id", "frontend");  in read_frontend_details()
232 	return !!xenbus_read_unsigned(dev->nodename, "online", 0);  in xenbus_dev_is_online()
239 	drv->read_otherend_details = read_frontend_details;  in __xenbus_register_backend()
262 	if (!dev->driver)  in backend_reclaim_memory()
264 	drv = to_xenbus_driver(dev->driver);  in backend_reclaim_memory()
265 	if (drv && drv->reclaim_memory) {  in backend_reclaim_memory()
267 		if (down_trylock(&xdev->reclaim_sem))  in backend_reclaim_memory()
269 		drv->reclaim_memory(xdev);  in backend_reclaim_memory()
270 		up(&xdev->reclaim_sem);  in backend_reclaim_memory()
282 	bus_for_each_dev(&xenbus_backend.bus, NULL, NULL,  in backend_shrink_memory_count()
293 	int err;  in xenbus_probe_backend_init()  local
297 	/* Register ourselves with the kernel bus subsystem */  in xenbus_probe_backend_init()
298 	err = bus_register(&xenbus_backend.bus);  in xenbus_probe_backend_init()
299 	if (err)  in xenbus_probe_backend_init()
300 		return err;  in xenbus_probe_backend_init()
304 	backend_memory_shrinker = shrinker_alloc(0, "xen-backend");  in xenbus_probe_backend_init()
310 	backend_memory_shrinker->count_objects = backend_shrink_memory_count;  in xenbus_probe_backend_init()