Commit | Line | Data |
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4bac07c9 JF |
1 | /****************************************************************************** |
2 | * Talks to Xen Store to figure out what devices we have. | |
3 | * | |
4 | * Copyright (C) 2005 Rusty Russell, IBM Corporation | |
5 | * Copyright (C) 2005 Mike Wray, Hewlett-Packard | |
6 | * Copyright (C) 2005, 2006 XenSource Ltd | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version 2 | |
10 | * as published by the Free Software Foundation; or, when distributed | |
11 | * separately from the Linux kernel or incorporated into other | |
12 | * software packages, subject to the following license: | |
13 | * | |
14 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
15 | * of this source file (the "Software"), to deal in the Software without | |
16 | * restriction, including without limitation the rights to use, copy, modify, | |
17 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
18 | * and to permit persons to whom the Software is furnished to do so, subject to | |
19 | * the following conditions: | |
20 | * | |
21 | * The above copyright notice and this permission notice shall be included in | |
22 | * all copies or substantial portions of the Software. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
25 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
26 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
27 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
28 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
29 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
30 | * IN THE SOFTWARE. | |
31 | */ | |
32 | ||
283c0972 JP |
33 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
34 | ||
4bac07c9 JF |
35 | #define DPRINTK(fmt, args...) \ |
36 | pr_debug("xenbus_probe (%s:%d) " fmt ".\n", \ | |
37 | __func__, __LINE__, ##args) | |
38 | ||
39 | #include <linux/kernel.h> | |
40 | #include <linux/err.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/ctype.h> | |
43 | #include <linux/fcntl.h> | |
44 | #include <linux/mm.h> | |
1107ba88 | 45 | #include <linux/proc_fs.h> |
4bac07c9 JF |
46 | #include <linux/notifier.h> |
47 | #include <linux/kthread.h> | |
48 | #include <linux/mutex.h> | |
49 | #include <linux/io.h> | |
5a0e3ad6 | 50 | #include <linux/slab.h> |
72ee5112 | 51 | #include <linux/module.h> |
4bac07c9 JF |
52 | |
53 | #include <asm/page.h> | |
54 | #include <asm/pgtable.h> | |
55 | #include <asm/xen/hypervisor.h> | |
1ccbf534 JF |
56 | |
57 | #include <xen/xen.h> | |
4bac07c9 JF |
58 | #include <xen/xenbus.h> |
59 | #include <xen/events.h> | |
16f1cf3b | 60 | #include <xen/xen-ops.h> |
4bac07c9 JF |
61 | #include <xen/page.h> |
62 | ||
bee6ab53 SY |
63 | #include <xen/hvm.h> |
64 | ||
332f791d | 65 | #include "xenbus.h" |
4bac07c9 | 66 | |
1107ba88 | 67 | |
4bac07c9 | 68 | int xen_store_evtchn; |
8e3e9991 | 69 | EXPORT_SYMBOL_GPL(xen_store_evtchn); |
1107ba88 | 70 | |
4bac07c9 | 71 | struct xenstore_domain_interface *xen_store_interface; |
8e3e9991 JF |
72 | EXPORT_SYMBOL_GPL(xen_store_interface); |
73 | ||
33c1174b AC |
74 | enum xenstore_init xen_store_domain_type; |
75 | EXPORT_SYMBOL_GPL(xen_store_domain_type); | |
76 | ||
5f51042f | 77 | static unsigned long xen_store_gfn; |
4bac07c9 JF |
78 | |
79 | static BLOCKING_NOTIFIER_HEAD(xenstore_chain); | |
80 | ||
4bac07c9 JF |
81 | /* If something in array of ids matches this device, return it. */ |
82 | static const struct xenbus_device_id * | |
83 | match_device(const struct xenbus_device_id *arr, struct xenbus_device *dev) | |
84 | { | |
85 | for (; *arr->devicetype != '\0'; arr++) { | |
86 | if (!strcmp(arr->devicetype, dev->devicetype)) | |
87 | return arr; | |
88 | } | |
89 | return NULL; | |
90 | } | |
91 | ||
92 | int xenbus_match(struct device *_dev, struct device_driver *_drv) | |
93 | { | |
94 | struct xenbus_driver *drv = to_xenbus_driver(_drv); | |
95 | ||
96 | if (!drv->ids) | |
97 | return 0; | |
98 | ||
99 | return match_device(drv->ids, to_xenbus_device(_dev)) != NULL; | |
100 | } | |
2de06cc1 IC |
101 | EXPORT_SYMBOL_GPL(xenbus_match); |
102 | ||
4bac07c9 | 103 | |
4bac07c9 JF |
104 | static void free_otherend_details(struct xenbus_device *dev) |
105 | { | |
106 | kfree(dev->otherend); | |
107 | dev->otherend = NULL; | |
108 | } | |
109 | ||
110 | ||
111 | static void free_otherend_watch(struct xenbus_device *dev) | |
112 | { | |
113 | if (dev->otherend_watch.node) { | |
114 | unregister_xenbus_watch(&dev->otherend_watch); | |
115 | kfree(dev->otherend_watch.node); | |
116 | dev->otherend_watch.node = NULL; | |
117 | } | |
118 | } | |
119 | ||
120 | ||
2de06cc1 IC |
121 | static int talk_to_otherend(struct xenbus_device *dev) |
122 | { | |
123 | struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver); | |
124 | ||
125 | free_otherend_watch(dev); | |
126 | free_otherend_details(dev); | |
127 | ||
128 | return drv->read_otherend_details(dev); | |
129 | } | |
130 | ||
131 | ||
132 | ||
133 | static int watch_otherend(struct xenbus_device *dev) | |
134 | { | |
6bac7f9f IC |
135 | struct xen_bus_type *bus = |
136 | container_of(dev->dev.bus, struct xen_bus_type, bus); | |
2de06cc1 | 137 | |
6bac7f9f IC |
138 | return xenbus_watch_pathfmt(dev, &dev->otherend_watch, |
139 | bus->otherend_changed, | |
2de06cc1 IC |
140 | "%s/%s", dev->otherend, "state"); |
141 | } | |
142 | ||
143 | ||
144 | int xenbus_read_otherend_details(struct xenbus_device *xendev, | |
4bac07c9 JF |
145 | char *id_node, char *path_node) |
146 | { | |
147 | int err = xenbus_gather(XBT_NIL, xendev->nodename, | |
148 | id_node, "%i", &xendev->otherend_id, | |
149 | path_node, NULL, &xendev->otherend, | |
150 | NULL); | |
151 | if (err) { | |
152 | xenbus_dev_fatal(xendev, err, | |
153 | "reading other end details from %s", | |
154 | xendev->nodename); | |
155 | return err; | |
156 | } | |
157 | if (strlen(xendev->otherend) == 0 || | |
158 | !xenbus_exists(XBT_NIL, xendev->otherend, "")) { | |
159 | xenbus_dev_fatal(xendev, -ENOENT, | |
160 | "unable to read other end from %s. " | |
161 | "missing or inaccessible.", | |
162 | xendev->nodename); | |
163 | free_otherend_details(xendev); | |
164 | return -ENOENT; | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
2de06cc1 | 169 | EXPORT_SYMBOL_GPL(xenbus_read_otherend_details); |
4bac07c9 | 170 | |
2de06cc1 | 171 | void xenbus_otherend_changed(struct xenbus_watch *watch, |
5584ea25 | 172 | const char *path, const char *token, |
2de06cc1 | 173 | int ignore_on_shutdown) |
4bac07c9 JF |
174 | { |
175 | struct xenbus_device *dev = | |
176 | container_of(watch, struct xenbus_device, otherend_watch); | |
177 | struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver); | |
178 | enum xenbus_state state; | |
179 | ||
180 | /* Protect us against watches firing on old details when the otherend | |
181 | details change, say immediately after a resume. */ | |
182 | if (!dev->otherend || | |
5584ea25 JG |
183 | strncmp(dev->otherend, path, strlen(dev->otherend))) { |
184 | dev_dbg(&dev->dev, "Ignoring watch at %s\n", path); | |
4bac07c9 JF |
185 | return; |
186 | } | |
187 | ||
188 | state = xenbus_read_driver_state(dev->otherend); | |
189 | ||
898eb71c | 190 | dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n", |
5584ea25 | 191 | state, xenbus_strstate(state), dev->otherend_watch.node, path); |
4bac07c9 JF |
192 | |
193 | /* | |
194 | * Ignore xenbus transitions during shutdown. This prevents us doing | |
195 | * work that can fail e.g., when the rootfs is gone. | |
196 | */ | |
197 | if (system_state > SYSTEM_RUNNING) { | |
2de06cc1 | 198 | if (ignore_on_shutdown && (state == XenbusStateClosing)) |
4bac07c9 JF |
199 | xenbus_frontend_closed(dev); |
200 | return; | |
201 | } | |
202 | ||
203 | if (drv->otherend_changed) | |
204 | drv->otherend_changed(dev, state); | |
205 | } | |
2de06cc1 | 206 | EXPORT_SYMBOL_GPL(xenbus_otherend_changed); |
4bac07c9 JF |
207 | |
208 | int xenbus_dev_probe(struct device *_dev) | |
209 | { | |
210 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
211 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); | |
212 | const struct xenbus_device_id *id; | |
213 | int err; | |
214 | ||
215 | DPRINTK("%s", dev->nodename); | |
216 | ||
217 | if (!drv->probe) { | |
218 | err = -ENODEV; | |
219 | goto fail; | |
220 | } | |
221 | ||
222 | id = match_device(drv->ids, dev); | |
223 | if (!id) { | |
224 | err = -ENODEV; | |
225 | goto fail; | |
226 | } | |
227 | ||
228 | err = talk_to_otherend(dev); | |
229 | if (err) { | |
230 | dev_warn(&dev->dev, "talk_to_otherend on %s failed.\n", | |
231 | dev->nodename); | |
232 | return err; | |
233 | } | |
234 | ||
235 | err = drv->probe(dev, id); | |
236 | if (err) | |
237 | goto fail; | |
238 | ||
239 | err = watch_otherend(dev); | |
240 | if (err) { | |
241 | dev_warn(&dev->dev, "watch_otherend on %s failed.\n", | |
242 | dev->nodename); | |
243 | return err; | |
244 | } | |
245 | ||
246 | return 0; | |
247 | fail: | |
248 | xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename); | |
249 | xenbus_switch_state(dev, XenbusStateClosed); | |
7432e4bd | 250 | return err; |
4bac07c9 | 251 | } |
2de06cc1 | 252 | EXPORT_SYMBOL_GPL(xenbus_dev_probe); |
4bac07c9 JF |
253 | |
254 | int xenbus_dev_remove(struct device *_dev) | |
255 | { | |
256 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
257 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); | |
258 | ||
259 | DPRINTK("%s", dev->nodename); | |
260 | ||
261 | free_otherend_watch(dev); | |
4bac07c9 JF |
262 | |
263 | if (drv->remove) | |
264 | drv->remove(dev); | |
265 | ||
bd0d5aa4 JB |
266 | free_otherend_details(dev); |
267 | ||
4bac07c9 JF |
268 | xenbus_switch_state(dev, XenbusStateClosed); |
269 | return 0; | |
270 | } | |
2de06cc1 | 271 | EXPORT_SYMBOL_GPL(xenbus_dev_remove); |
4bac07c9 | 272 | |
2de06cc1 | 273 | void xenbus_dev_shutdown(struct device *_dev) |
4bac07c9 JF |
274 | { |
275 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
276 | unsigned long timeout = 5*HZ; | |
277 | ||
278 | DPRINTK("%s", dev->nodename); | |
279 | ||
280 | get_device(&dev->dev); | |
281 | if (dev->state != XenbusStateConnected) { | |
283c0972 JP |
282 | pr_info("%s: %s: %s != Connected, skipping\n", |
283 | __func__, dev->nodename, xenbus_strstate(dev->state)); | |
4bac07c9 JF |
284 | goto out; |
285 | } | |
286 | xenbus_switch_state(dev, XenbusStateClosing); | |
287 | timeout = wait_for_completion_timeout(&dev->down, timeout); | |
288 | if (!timeout) | |
283c0972 JP |
289 | pr_info("%s: %s timeout closing device\n", |
290 | __func__, dev->nodename); | |
4bac07c9 JF |
291 | out: |
292 | put_device(&dev->dev); | |
293 | } | |
2de06cc1 | 294 | EXPORT_SYMBOL_GPL(xenbus_dev_shutdown); |
4bac07c9 JF |
295 | |
296 | int xenbus_register_driver_common(struct xenbus_driver *drv, | |
95afae48 DV |
297 | struct xen_bus_type *bus, |
298 | struct module *owner, const char *mod_name) | |
4bac07c9 | 299 | { |
95afae48 | 300 | drv->driver.name = drv->name ? drv->name : drv->ids[0].devicetype; |
4bac07c9 | 301 | drv->driver.bus = &bus->bus; |
95afae48 DV |
302 | drv->driver.owner = owner; |
303 | drv->driver.mod_name = mod_name; | |
4bac07c9 JF |
304 | |
305 | return driver_register(&drv->driver); | |
306 | } | |
2de06cc1 | 307 | EXPORT_SYMBOL_GPL(xenbus_register_driver_common); |
4bac07c9 JF |
308 | |
309 | void xenbus_unregister_driver(struct xenbus_driver *drv) | |
310 | { | |
311 | driver_unregister(&drv->driver); | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(xenbus_unregister_driver); | |
314 | ||
6913200a | 315 | struct xb_find_info { |
4bac07c9 JF |
316 | struct xenbus_device *dev; |
317 | const char *nodename; | |
318 | }; | |
319 | ||
320 | static int cmp_dev(struct device *dev, void *data) | |
321 | { | |
322 | struct xenbus_device *xendev = to_xenbus_device(dev); | |
323 | struct xb_find_info *info = data; | |
324 | ||
325 | if (!strcmp(xendev->nodename, info->nodename)) { | |
326 | info->dev = xendev; | |
327 | get_device(dev); | |
328 | return 1; | |
329 | } | |
330 | return 0; | |
331 | } | |
332 | ||
b8b0f559 KRW |
333 | static struct xenbus_device *xenbus_device_find(const char *nodename, |
334 | struct bus_type *bus) | |
4bac07c9 JF |
335 | { |
336 | struct xb_find_info info = { .dev = NULL, .nodename = nodename }; | |
337 | ||
338 | bus_for_each_dev(bus, NULL, &info, cmp_dev); | |
339 | return info.dev; | |
340 | } | |
341 | ||
342 | static int cleanup_dev(struct device *dev, void *data) | |
343 | { | |
344 | struct xenbus_device *xendev = to_xenbus_device(dev); | |
345 | struct xb_find_info *info = data; | |
346 | int len = strlen(info->nodename); | |
347 | ||
348 | DPRINTK("%s", info->nodename); | |
349 | ||
350 | /* Match the info->nodename path, or any subdirectory of that path. */ | |
351 | if (strncmp(xendev->nodename, info->nodename, len)) | |
352 | return 0; | |
353 | ||
354 | /* If the node name is longer, ensure it really is a subdirectory. */ | |
355 | if ((strlen(xendev->nodename) > len) && (xendev->nodename[len] != '/')) | |
356 | return 0; | |
357 | ||
358 | info->dev = xendev; | |
359 | get_device(dev); | |
360 | return 1; | |
361 | } | |
362 | ||
363 | static void xenbus_cleanup_devices(const char *path, struct bus_type *bus) | |
364 | { | |
365 | struct xb_find_info info = { .nodename = path }; | |
366 | ||
367 | do { | |
368 | info.dev = NULL; | |
369 | bus_for_each_dev(bus, NULL, &info, cleanup_dev); | |
370 | if (info.dev) { | |
371 | device_unregister(&info.dev->dev); | |
372 | put_device(&info.dev->dev); | |
373 | } | |
374 | } while (info.dev); | |
375 | } | |
376 | ||
377 | static void xenbus_dev_release(struct device *dev) | |
378 | { | |
379 | if (dev) | |
380 | kfree(to_xenbus_device(dev)); | |
381 | } | |
382 | ||
cc85e933 BB |
383 | static ssize_t nodename_show(struct device *dev, |
384 | struct device_attribute *attr, char *buf) | |
4bac07c9 JF |
385 | { |
386 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->nodename); | |
387 | } | |
85dd9268 | 388 | static DEVICE_ATTR_RO(nodename); |
4bac07c9 | 389 | |
cc85e933 BB |
390 | static ssize_t devtype_show(struct device *dev, |
391 | struct device_attribute *attr, char *buf) | |
4bac07c9 JF |
392 | { |
393 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->devicetype); | |
394 | } | |
85dd9268 | 395 | static DEVICE_ATTR_RO(devtype); |
4bac07c9 | 396 | |
cc85e933 BB |
397 | static ssize_t modalias_show(struct device *dev, |
398 | struct device_attribute *attr, char *buf) | |
d2f0c52b | 399 | { |
149bb2fa BB |
400 | return sprintf(buf, "%s:%s\n", dev->bus->name, |
401 | to_xenbus_device(dev)->devicetype); | |
d2f0c52b | 402 | } |
85dd9268 | 403 | static DEVICE_ATTR_RO(modalias); |
cc85e933 | 404 | |
85dd9268 GKH |
405 | static struct attribute *xenbus_dev_attrs[] = { |
406 | &dev_attr_nodename.attr, | |
407 | &dev_attr_devtype.attr, | |
408 | &dev_attr_modalias.attr, | |
409 | NULL, | |
cc85e933 | 410 | }; |
85dd9268 GKH |
411 | |
412 | static const struct attribute_group xenbus_dev_group = { | |
413 | .attrs = xenbus_dev_attrs, | |
414 | }; | |
415 | ||
416 | const struct attribute_group *xenbus_dev_groups[] = { | |
417 | &xenbus_dev_group, | |
418 | NULL, | |
419 | }; | |
420 | EXPORT_SYMBOL_GPL(xenbus_dev_groups); | |
4bac07c9 JF |
421 | |
422 | int xenbus_probe_node(struct xen_bus_type *bus, | |
423 | const char *type, | |
424 | const char *nodename) | |
425 | { | |
2a678cc5 | 426 | char devname[XEN_BUS_ID_SIZE]; |
4bac07c9 JF |
427 | int err; |
428 | struct xenbus_device *xendev; | |
429 | size_t stringlen; | |
430 | char *tmpstring; | |
431 | ||
432 | enum xenbus_state state = xenbus_read_driver_state(nodename); | |
433 | ||
434 | if (state != XenbusStateInitialising) { | |
435 | /* Device is not new, so ignore it. This can happen if a | |
436 | device is going away after switching to Closed. */ | |
437 | return 0; | |
438 | } | |
439 | ||
440 | stringlen = strlen(nodename) + 1 + strlen(type) + 1; | |
441 | xendev = kzalloc(sizeof(*xendev) + stringlen, GFP_KERNEL); | |
442 | if (!xendev) | |
443 | return -ENOMEM; | |
444 | ||
445 | xendev->state = XenbusStateInitialising; | |
446 | ||
447 | /* Copy the strings into the extra space. */ | |
448 | ||
449 | tmpstring = (char *)(xendev + 1); | |
450 | strcpy(tmpstring, nodename); | |
451 | xendev->nodename = tmpstring; | |
452 | ||
453 | tmpstring += strlen(tmpstring) + 1; | |
454 | strcpy(tmpstring, type); | |
455 | xendev->devicetype = tmpstring; | |
456 | init_completion(&xendev->down); | |
457 | ||
458 | xendev->dev.bus = &bus->bus; | |
459 | xendev->dev.release = xenbus_dev_release; | |
460 | ||
2a678cc5 | 461 | err = bus->get_bus_id(devname, xendev->nodename); |
4bac07c9 JF |
462 | if (err) |
463 | goto fail; | |
464 | ||
02aa2a37 | 465 | dev_set_name(&xendev->dev, "%s", devname); |
2a678cc5 | 466 | |
4bac07c9 JF |
467 | /* Register with generic device framework. */ |
468 | err = device_register(&xendev->dev); | |
469 | if (err) | |
470 | goto fail; | |
471 | ||
4bac07c9 | 472 | return 0; |
4bac07c9 JF |
473 | fail: |
474 | kfree(xendev); | |
475 | return err; | |
476 | } | |
2de06cc1 | 477 | EXPORT_SYMBOL_GPL(xenbus_probe_node); |
4bac07c9 JF |
478 | |
479 | static int xenbus_probe_device_type(struct xen_bus_type *bus, const char *type) | |
480 | { | |
481 | int err = 0; | |
482 | char **dir; | |
483 | unsigned int dir_n = 0; | |
484 | int i; | |
485 | ||
486 | dir = xenbus_directory(XBT_NIL, bus->root, type, &dir_n); | |
a39bda27 | 487 | if (IS_ERR(dir)) |
4bac07c9 JF |
488 | return PTR_ERR(dir); |
489 | ||
490 | for (i = 0; i < dir_n; i++) { | |
2de06cc1 | 491 | err = bus->probe(bus, type, dir[i]); |
a39bda27 | 492 | if (err) |
4bac07c9 JF |
493 | break; |
494 | } | |
a39bda27 | 495 | |
4bac07c9 JF |
496 | kfree(dir); |
497 | return err; | |
498 | } | |
499 | ||
500 | int xenbus_probe_devices(struct xen_bus_type *bus) | |
501 | { | |
502 | int err = 0; | |
503 | char **dir; | |
504 | unsigned int i, dir_n; | |
505 | ||
506 | dir = xenbus_directory(XBT_NIL, bus->root, "", &dir_n); | |
a39bda27 | 507 | if (IS_ERR(dir)) |
4bac07c9 JF |
508 | return PTR_ERR(dir); |
509 | ||
510 | for (i = 0; i < dir_n; i++) { | |
511 | err = xenbus_probe_device_type(bus, dir[i]); | |
a39bda27 | 512 | if (err) |
4bac07c9 JF |
513 | break; |
514 | } | |
a39bda27 | 515 | |
4bac07c9 JF |
516 | kfree(dir); |
517 | return err; | |
518 | } | |
2de06cc1 | 519 | EXPORT_SYMBOL_GPL(xenbus_probe_devices); |
4bac07c9 JF |
520 | |
521 | static unsigned int char_count(const char *str, char c) | |
522 | { | |
523 | unsigned int i, ret = 0; | |
524 | ||
525 | for (i = 0; str[i]; i++) | |
526 | if (str[i] == c) | |
527 | ret++; | |
528 | return ret; | |
529 | } | |
530 | ||
531 | static int strsep_len(const char *str, char c, unsigned int len) | |
532 | { | |
533 | unsigned int i; | |
534 | ||
535 | for (i = 0; str[i]; i++) | |
536 | if (str[i] == c) { | |
537 | if (len == 0) | |
538 | return i; | |
539 | len--; | |
540 | } | |
541 | return (len == 0) ? i : -ERANGE; | |
542 | } | |
543 | ||
544 | void xenbus_dev_changed(const char *node, struct xen_bus_type *bus) | |
545 | { | |
546 | int exists, rootlen; | |
547 | struct xenbus_device *dev; | |
2a678cc5 | 548 | char type[XEN_BUS_ID_SIZE]; |
4bac07c9 JF |
549 | const char *p, *root; |
550 | ||
551 | if (char_count(node, '/') < 2) | |
552 | return; | |
553 | ||
554 | exists = xenbus_exists(XBT_NIL, node, ""); | |
555 | if (!exists) { | |
556 | xenbus_cleanup_devices(node, &bus->bus); | |
557 | return; | |
558 | } | |
559 | ||
560 | /* backend/<type>/... or device/<type>/... */ | |
561 | p = strchr(node, '/') + 1; | |
2a678cc5 KS |
562 | snprintf(type, XEN_BUS_ID_SIZE, "%.*s", (int)strcspn(p, "/"), p); |
563 | type[XEN_BUS_ID_SIZE-1] = '\0'; | |
4bac07c9 JF |
564 | |
565 | rootlen = strsep_len(node, '/', bus->levels); | |
566 | if (rootlen < 0) | |
567 | return; | |
568 | root = kasprintf(GFP_KERNEL, "%.*s", rootlen, node); | |
569 | if (!root) | |
570 | return; | |
571 | ||
572 | dev = xenbus_device_find(root, &bus->bus); | |
573 | if (!dev) | |
574 | xenbus_probe_node(bus, type, root); | |
575 | else | |
576 | put_device(&dev->dev); | |
577 | ||
578 | kfree(root); | |
579 | } | |
c6a960ce | 580 | EXPORT_SYMBOL_GPL(xenbus_dev_changed); |
4bac07c9 | 581 | |
c7853aea | 582 | int xenbus_dev_suspend(struct device *dev) |
4bac07c9 JF |
583 | { |
584 | int err = 0; | |
585 | struct xenbus_driver *drv; | |
6bac7f9f IC |
586 | struct xenbus_device *xdev |
587 | = container_of(dev, struct xenbus_device, dev); | |
4bac07c9 | 588 | |
2de06cc1 | 589 | DPRINTK("%s", xdev->nodename); |
4bac07c9 JF |
590 | |
591 | if (dev->driver == NULL) | |
592 | return 0; | |
593 | drv = to_xenbus_driver(dev->driver); | |
4bac07c9 | 594 | if (drv->suspend) |
c7853aea | 595 | err = drv->suspend(xdev); |
4bac07c9 | 596 | if (err) |
283c0972 | 597 | pr_warn("suspend %s failed: %i\n", dev_name(dev), err); |
4bac07c9 JF |
598 | return 0; |
599 | } | |
2de06cc1 | 600 | EXPORT_SYMBOL_GPL(xenbus_dev_suspend); |
4bac07c9 | 601 | |
2de06cc1 | 602 | int xenbus_dev_resume(struct device *dev) |
4bac07c9 JF |
603 | { |
604 | int err; | |
605 | struct xenbus_driver *drv; | |
6bac7f9f IC |
606 | struct xenbus_device *xdev |
607 | = container_of(dev, struct xenbus_device, dev); | |
4bac07c9 | 608 | |
2de06cc1 | 609 | DPRINTK("%s", xdev->nodename); |
4bac07c9 JF |
610 | |
611 | if (dev->driver == NULL) | |
612 | return 0; | |
4bac07c9 | 613 | drv = to_xenbus_driver(dev->driver); |
4bac07c9 JF |
614 | err = talk_to_otherend(xdev); |
615 | if (err) { | |
283c0972 JP |
616 | pr_warn("resume (talk_to_otherend) %s failed: %i\n", |
617 | dev_name(dev), err); | |
4bac07c9 JF |
618 | return err; |
619 | } | |
620 | ||
621 | xdev->state = XenbusStateInitialising; | |
622 | ||
623 | if (drv->resume) { | |
624 | err = drv->resume(xdev); | |
625 | if (err) { | |
283c0972 | 626 | pr_warn("resume %s failed: %i\n", dev_name(dev), err); |
4bac07c9 JF |
627 | return err; |
628 | } | |
629 | } | |
630 | ||
631 | err = watch_otherend(xdev); | |
632 | if (err) { | |
283c0972 JP |
633 | pr_warn("resume (watch_otherend) %s failed: %d.\n", |
634 | dev_name(dev), err); | |
4bac07c9 JF |
635 | return err; |
636 | } | |
637 | ||
638 | return 0; | |
639 | } | |
2de06cc1 | 640 | EXPORT_SYMBOL_GPL(xenbus_dev_resume); |
4bac07c9 | 641 | |
c7853aea KS |
642 | int xenbus_dev_cancel(struct device *dev) |
643 | { | |
644 | /* Do nothing */ | |
645 | DPRINTK("cancel"); | |
646 | return 0; | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(xenbus_dev_cancel); | |
649 | ||
4bac07c9 | 650 | /* A flag to determine if xenstored is 'ready' (i.e. has started) */ |
6913200a | 651 | int xenstored_ready; |
4bac07c9 JF |
652 | |
653 | ||
654 | int register_xenstore_notifier(struct notifier_block *nb) | |
655 | { | |
656 | int ret = 0; | |
657 | ||
a947f0f8 SS |
658 | if (xenstored_ready > 0) |
659 | ret = nb->notifier_call(nb, 0, NULL); | |
660 | else | |
661 | blocking_notifier_chain_register(&xenstore_chain, nb); | |
4bac07c9 JF |
662 | |
663 | return ret; | |
664 | } | |
665 | EXPORT_SYMBOL_GPL(register_xenstore_notifier); | |
666 | ||
667 | void unregister_xenstore_notifier(struct notifier_block *nb) | |
668 | { | |
669 | blocking_notifier_chain_unregister(&xenstore_chain, nb); | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(unregister_xenstore_notifier); | |
672 | ||
673 | void xenbus_probe(struct work_struct *unused) | |
674 | { | |
a947f0f8 | 675 | xenstored_ready = 1; |
4bac07c9 | 676 | |
4bac07c9 JF |
677 | /* Notify others that xenstore is up */ |
678 | blocking_notifier_call_chain(&xenstore_chain, 0, NULL); | |
679 | } | |
183d03cc | 680 | EXPORT_SYMBOL_GPL(xenbus_probe); |
4bac07c9 | 681 | |
183d03cc SS |
682 | static int __init xenbus_probe_initcall(void) |
683 | { | |
684 | if (!xen_domain()) | |
685 | return -ENODEV; | |
686 | ||
687 | if (xen_initial_domain() || xen_hvm_domain()) | |
688 | return 0; | |
689 | ||
690 | xenbus_probe(NULL); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | device_initcall(xenbus_probe_initcall); | |
695 | ||
e4184aaf DDG |
696 | /* Set up event channel for xenstored which is run as a local process |
697 | * (this is normally used only in dom0) | |
698 | */ | |
699 | static int __init xenstored_local_init(void) | |
4bac07c9 | 700 | { |
2466d4b9 | 701 | int err = -ENOMEM; |
b37a56d6 | 702 | unsigned long page = 0; |
e4184aaf | 703 | struct evtchn_alloc_unbound alloc_unbound; |
4bac07c9 | 704 | |
e4184aaf DDG |
705 | /* Allocate Xenstore page */ |
706 | page = get_zeroed_page(GFP_KERNEL); | |
707 | if (!page) | |
708 | goto out_err; | |
4bac07c9 | 709 | |
5f51042f | 710 | xen_store_gfn = xen_start_info->store_mfn = virt_to_gfn((void *)page); |
4bac07c9 | 711 | |
e4184aaf DDG |
712 | /* Next allocate a local port which xenstored can bind to */ |
713 | alloc_unbound.dom = DOMID_SELF; | |
714 | alloc_unbound.remote_dom = DOMID_SELF; | |
b37a56d6 | 715 | |
e4184aaf DDG |
716 | err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, |
717 | &alloc_unbound); | |
718 | if (err == -ENOSYS) | |
719 | goto out_err; | |
b37a56d6 | 720 | |
e4184aaf DDG |
721 | BUG_ON(err); |
722 | xen_store_evtchn = xen_start_info->store_evtchn = | |
723 | alloc_unbound.port; | |
b37a56d6 | 724 | |
e4184aaf | 725 | return 0; |
b37a56d6 | 726 | |
e4184aaf DDG |
727 | out_err: |
728 | if (page != 0) | |
729 | free_page(page); | |
730 | return err; | |
731 | } | |
b37a56d6 | 732 | |
16f1cf3b BO |
733 | static int xenbus_resume_cb(struct notifier_block *nb, |
734 | unsigned long action, void *data) | |
735 | { | |
736 | int err = 0; | |
737 | ||
738 | if (xen_hvm_domain()) { | |
76ea3cb4 | 739 | uint64_t v = 0; |
16f1cf3b BO |
740 | |
741 | err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); | |
742 | if (!err && v) | |
743 | xen_store_evtchn = v; | |
744 | else | |
745 | pr_warn("Cannot update xenstore event channel: %d\n", | |
746 | err); | |
747 | } else | |
748 | xen_store_evtchn = xen_start_info->store_evtchn; | |
749 | ||
750 | return err; | |
751 | } | |
752 | ||
753 | static struct notifier_block xenbus_resume_nb = { | |
754 | .notifier_call = xenbus_resume_cb, | |
755 | }; | |
756 | ||
e4184aaf DDG |
757 | static int __init xenbus_init(void) |
758 | { | |
759 | int err = 0; | |
ecc635f9 | 760 | uint64_t v = 0; |
33c1174b | 761 | xen_store_domain_type = XS_UNKNOWN; |
b37a56d6 | 762 | |
e4184aaf DDG |
763 | if (!xen_domain()) |
764 | return -ENODEV; | |
765 | ||
2c5d37d3 DDG |
766 | xenbus_ring_ops_init(); |
767 | ||
ecc635f9 | 768 | if (xen_pv_domain()) |
33c1174b | 769 | xen_store_domain_type = XS_PV; |
ecc635f9 | 770 | if (xen_hvm_domain()) |
33c1174b | 771 | xen_store_domain_type = XS_HVM; |
ecc635f9 | 772 | if (xen_hvm_domain() && xen_initial_domain()) |
33c1174b | 773 | xen_store_domain_type = XS_LOCAL; |
ecc635f9 | 774 | if (xen_pv_domain() && !xen_start_info->store_evtchn) |
33c1174b | 775 | xen_store_domain_type = XS_LOCAL; |
ecc635f9 SS |
776 | if (xen_pv_domain() && xen_start_info->store_evtchn) |
777 | xenstored_ready = 1; | |
778 | ||
33c1174b AC |
779 | switch (xen_store_domain_type) { |
780 | case XS_LOCAL: | |
ecc635f9 SS |
781 | err = xenstored_local_init(); |
782 | if (err) | |
783 | goto out_error; | |
5f51042f | 784 | xen_store_interface = gfn_to_virt(xen_store_gfn); |
ecc635f9 | 785 | break; |
33c1174b | 786 | case XS_PV: |
ecc635f9 | 787 | xen_store_evtchn = xen_start_info->store_evtchn; |
5f51042f JG |
788 | xen_store_gfn = xen_start_info->store_mfn; |
789 | xen_store_interface = gfn_to_virt(xen_store_gfn); | |
ecc635f9 | 790 | break; |
33c1174b | 791 | case XS_HVM: |
e4184aaf DDG |
792 | err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); |
793 | if (err) | |
794 | goto out_error; | |
795 | xen_store_evtchn = (int)v; | |
796 | err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); | |
797 | if (err) | |
798 | goto out_error; | |
5f51042f | 799 | xen_store_gfn = (unsigned long)v; |
ecc635f9 | 800 | xen_store_interface = |
7d567928 JG |
801 | xen_remap(xen_store_gfn << XEN_PAGE_SHIFT, |
802 | XEN_PAGE_SIZE); | |
ecc635f9 SS |
803 | break; |
804 | default: | |
805 | pr_warn("Xenstore state unknown\n"); | |
806 | break; | |
4bac07c9 | 807 | } |
4bac07c9 JF |
808 | |
809 | /* Initialize the interface to xenstore. */ | |
810 | err = xs_init(); | |
811 | if (err) { | |
283c0972 | 812 | pr_warn("Error initializing xenstore comms: %i\n", err); |
2de06cc1 | 813 | goto out_error; |
4bac07c9 JF |
814 | } |
815 | ||
16f1cf3b BO |
816 | if ((xen_store_domain_type != XS_LOCAL) && |
817 | (xen_store_domain_type != XS_UNKNOWN)) | |
818 | xen_resume_notifier_register(&xenbus_resume_nb); | |
819 | ||
1107ba88 AZ |
820 | #ifdef CONFIG_XEN_COMPAT_XENFS |
821 | /* | |
822 | * Create xenfs mountpoint in /proc for compatibility with | |
823 | * utilities that expect to find "xenbus" under "/proc/xen". | |
824 | */ | |
f97df70b | 825 | proc_create_mount_point("xen"); |
1107ba88 AZ |
826 | #endif |
827 | ||
6913200a | 828 | out_error: |
4bac07c9 JF |
829 | return err; |
830 | } | |
831 | ||
183d03cc | 832 | postcore_initcall(xenbus_init); |
4bac07c9 JF |
833 | |
834 | MODULE_LICENSE("GPL"); |