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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 | ||
33 | #define DPRINTK(fmt, args...) \ | |
34 | pr_debug("xenbus_probe (%s:%d) " fmt ".\n", \ | |
35 | __func__, __LINE__, ##args) | |
36 | ||
37 | #include <linux/kernel.h> | |
38 | #include <linux/err.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/ctype.h> | |
41 | #include <linux/fcntl.h> | |
42 | #include <linux/mm.h> | |
1107ba88 | 43 | #include <linux/proc_fs.h> |
4bac07c9 JF |
44 | #include <linux/notifier.h> |
45 | #include <linux/kthread.h> | |
46 | #include <linux/mutex.h> | |
47 | #include <linux/io.h> | |
5a0e3ad6 | 48 | #include <linux/slab.h> |
4bac07c9 JF |
49 | |
50 | #include <asm/page.h> | |
51 | #include <asm/pgtable.h> | |
52 | #include <asm/xen/hypervisor.h> | |
1ccbf534 JF |
53 | |
54 | #include <xen/xen.h> | |
4bac07c9 JF |
55 | #include <xen/xenbus.h> |
56 | #include <xen/events.h> | |
57 | #include <xen/page.h> | |
58 | ||
bee6ab53 SY |
59 | #include <xen/hvm.h> |
60 | ||
4bac07c9 JF |
61 | #include "xenbus_comms.h" |
62 | #include "xenbus_probe.h" | |
63 | ||
1107ba88 | 64 | |
4bac07c9 | 65 | int xen_store_evtchn; |
8e3e9991 | 66 | EXPORT_SYMBOL_GPL(xen_store_evtchn); |
1107ba88 | 67 | |
4bac07c9 | 68 | struct xenstore_domain_interface *xen_store_interface; |
8e3e9991 JF |
69 | EXPORT_SYMBOL_GPL(xen_store_interface); |
70 | ||
4bac07c9 JF |
71 | static unsigned long xen_store_mfn; |
72 | ||
73 | static BLOCKING_NOTIFIER_HEAD(xenstore_chain); | |
74 | ||
4bac07c9 JF |
75 | /* If something in array of ids matches this device, return it. */ |
76 | static const struct xenbus_device_id * | |
77 | match_device(const struct xenbus_device_id *arr, struct xenbus_device *dev) | |
78 | { | |
79 | for (; *arr->devicetype != '\0'; arr++) { | |
80 | if (!strcmp(arr->devicetype, dev->devicetype)) | |
81 | return arr; | |
82 | } | |
83 | return NULL; | |
84 | } | |
85 | ||
86 | int xenbus_match(struct device *_dev, struct device_driver *_drv) | |
87 | { | |
88 | struct xenbus_driver *drv = to_xenbus_driver(_drv); | |
89 | ||
90 | if (!drv->ids) | |
91 | return 0; | |
92 | ||
93 | return match_device(drv->ids, to_xenbus_device(_dev)) != NULL; | |
94 | } | |
2de06cc1 IC |
95 | EXPORT_SYMBOL_GPL(xenbus_match); |
96 | ||
4bac07c9 | 97 | |
4bac07c9 JF |
98 | static void free_otherend_details(struct xenbus_device *dev) |
99 | { | |
100 | kfree(dev->otherend); | |
101 | dev->otherend = NULL; | |
102 | } | |
103 | ||
104 | ||
105 | static void free_otherend_watch(struct xenbus_device *dev) | |
106 | { | |
107 | if (dev->otherend_watch.node) { | |
108 | unregister_xenbus_watch(&dev->otherend_watch); | |
109 | kfree(dev->otherend_watch.node); | |
110 | dev->otherend_watch.node = NULL; | |
111 | } | |
112 | } | |
113 | ||
114 | ||
2de06cc1 IC |
115 | static int talk_to_otherend(struct xenbus_device *dev) |
116 | { | |
117 | struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver); | |
118 | ||
119 | free_otherend_watch(dev); | |
120 | free_otherend_details(dev); | |
121 | ||
122 | return drv->read_otherend_details(dev); | |
123 | } | |
124 | ||
125 | ||
126 | ||
127 | static int watch_otherend(struct xenbus_device *dev) | |
128 | { | |
6bac7f9f IC |
129 | struct xen_bus_type *bus = |
130 | container_of(dev->dev.bus, struct xen_bus_type, bus); | |
2de06cc1 | 131 | |
6bac7f9f IC |
132 | return xenbus_watch_pathfmt(dev, &dev->otherend_watch, |
133 | bus->otherend_changed, | |
2de06cc1 IC |
134 | "%s/%s", dev->otherend, "state"); |
135 | } | |
136 | ||
137 | ||
138 | int xenbus_read_otherend_details(struct xenbus_device *xendev, | |
4bac07c9 JF |
139 | char *id_node, char *path_node) |
140 | { | |
141 | int err = xenbus_gather(XBT_NIL, xendev->nodename, | |
142 | id_node, "%i", &xendev->otherend_id, | |
143 | path_node, NULL, &xendev->otherend, | |
144 | NULL); | |
145 | if (err) { | |
146 | xenbus_dev_fatal(xendev, err, | |
147 | "reading other end details from %s", | |
148 | xendev->nodename); | |
149 | return err; | |
150 | } | |
151 | if (strlen(xendev->otherend) == 0 || | |
152 | !xenbus_exists(XBT_NIL, xendev->otherend, "")) { | |
153 | xenbus_dev_fatal(xendev, -ENOENT, | |
154 | "unable to read other end from %s. " | |
155 | "missing or inaccessible.", | |
156 | xendev->nodename); | |
157 | free_otherend_details(xendev); | |
158 | return -ENOENT; | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
2de06cc1 | 163 | EXPORT_SYMBOL_GPL(xenbus_read_otherend_details); |
4bac07c9 | 164 | |
2de06cc1 IC |
165 | void xenbus_otherend_changed(struct xenbus_watch *watch, |
166 | const char **vec, unsigned int len, | |
167 | int ignore_on_shutdown) | |
4bac07c9 JF |
168 | { |
169 | struct xenbus_device *dev = | |
170 | container_of(watch, struct xenbus_device, otherend_watch); | |
171 | struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver); | |
172 | enum xenbus_state state; | |
173 | ||
174 | /* Protect us against watches firing on old details when the otherend | |
175 | details change, say immediately after a resume. */ | |
176 | if (!dev->otherend || | |
177 | strncmp(dev->otherend, vec[XS_WATCH_PATH], | |
178 | strlen(dev->otherend))) { | |
898eb71c JP |
179 | dev_dbg(&dev->dev, "Ignoring watch at %s\n", |
180 | vec[XS_WATCH_PATH]); | |
4bac07c9 JF |
181 | return; |
182 | } | |
183 | ||
184 | state = xenbus_read_driver_state(dev->otherend); | |
185 | ||
898eb71c | 186 | dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n", |
4bac07c9 JF |
187 | state, xenbus_strstate(state), dev->otherend_watch.node, |
188 | vec[XS_WATCH_PATH]); | |
189 | ||
190 | /* | |
191 | * Ignore xenbus transitions during shutdown. This prevents us doing | |
192 | * work that can fail e.g., when the rootfs is gone. | |
193 | */ | |
194 | if (system_state > SYSTEM_RUNNING) { | |
2de06cc1 | 195 | if (ignore_on_shutdown && (state == XenbusStateClosing)) |
4bac07c9 JF |
196 | xenbus_frontend_closed(dev); |
197 | return; | |
198 | } | |
199 | ||
200 | if (drv->otherend_changed) | |
201 | drv->otherend_changed(dev, state); | |
202 | } | |
2de06cc1 | 203 | EXPORT_SYMBOL_GPL(xenbus_otherend_changed); |
4bac07c9 JF |
204 | |
205 | int xenbus_dev_probe(struct device *_dev) | |
206 | { | |
207 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
208 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); | |
209 | const struct xenbus_device_id *id; | |
210 | int err; | |
211 | ||
212 | DPRINTK("%s", dev->nodename); | |
213 | ||
214 | if (!drv->probe) { | |
215 | err = -ENODEV; | |
216 | goto fail; | |
217 | } | |
218 | ||
219 | id = match_device(drv->ids, dev); | |
220 | if (!id) { | |
221 | err = -ENODEV; | |
222 | goto fail; | |
223 | } | |
224 | ||
225 | err = talk_to_otherend(dev); | |
226 | if (err) { | |
227 | dev_warn(&dev->dev, "talk_to_otherend on %s failed.\n", | |
228 | dev->nodename); | |
229 | return err; | |
230 | } | |
231 | ||
232 | err = drv->probe(dev, id); | |
233 | if (err) | |
234 | goto fail; | |
235 | ||
236 | err = watch_otherend(dev); | |
237 | if (err) { | |
238 | dev_warn(&dev->dev, "watch_otherend on %s failed.\n", | |
239 | dev->nodename); | |
240 | return err; | |
241 | } | |
242 | ||
243 | return 0; | |
244 | fail: | |
245 | xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename); | |
246 | xenbus_switch_state(dev, XenbusStateClosed); | |
7432e4bd | 247 | return err; |
4bac07c9 | 248 | } |
2de06cc1 | 249 | EXPORT_SYMBOL_GPL(xenbus_dev_probe); |
4bac07c9 JF |
250 | |
251 | int xenbus_dev_remove(struct device *_dev) | |
252 | { | |
253 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
254 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); | |
255 | ||
256 | DPRINTK("%s", dev->nodename); | |
257 | ||
258 | free_otherend_watch(dev); | |
259 | free_otherend_details(dev); | |
260 | ||
261 | if (drv->remove) | |
262 | drv->remove(dev); | |
263 | ||
264 | xenbus_switch_state(dev, XenbusStateClosed); | |
265 | return 0; | |
266 | } | |
2de06cc1 | 267 | EXPORT_SYMBOL_GPL(xenbus_dev_remove); |
4bac07c9 | 268 | |
2de06cc1 | 269 | void xenbus_dev_shutdown(struct device *_dev) |
4bac07c9 JF |
270 | { |
271 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
272 | unsigned long timeout = 5*HZ; | |
273 | ||
274 | DPRINTK("%s", dev->nodename); | |
275 | ||
276 | get_device(&dev->dev); | |
277 | if (dev->state != XenbusStateConnected) { | |
278 | printk(KERN_INFO "%s: %s: %s != Connected, skipping\n", __func__, | |
279 | dev->nodename, xenbus_strstate(dev->state)); | |
280 | goto out; | |
281 | } | |
282 | xenbus_switch_state(dev, XenbusStateClosing); | |
283 | timeout = wait_for_completion_timeout(&dev->down, timeout); | |
284 | if (!timeout) | |
285 | printk(KERN_INFO "%s: %s timeout closing device\n", | |
286 | __func__, dev->nodename); | |
287 | out: | |
288 | put_device(&dev->dev); | |
289 | } | |
2de06cc1 | 290 | EXPORT_SYMBOL_GPL(xenbus_dev_shutdown); |
4bac07c9 JF |
291 | |
292 | int xenbus_register_driver_common(struct xenbus_driver *drv, | |
293 | struct xen_bus_type *bus, | |
294 | struct module *owner, | |
295 | const char *mod_name) | |
296 | { | |
297 | drv->driver.name = drv->name; | |
298 | drv->driver.bus = &bus->bus; | |
299 | drv->driver.owner = owner; | |
300 | drv->driver.mod_name = mod_name; | |
301 | ||
302 | return driver_register(&drv->driver); | |
303 | } | |
2de06cc1 | 304 | EXPORT_SYMBOL_GPL(xenbus_register_driver_common); |
4bac07c9 JF |
305 | |
306 | void xenbus_unregister_driver(struct xenbus_driver *drv) | |
307 | { | |
308 | driver_unregister(&drv->driver); | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(xenbus_unregister_driver); | |
311 | ||
312 | struct xb_find_info | |
313 | { | |
314 | struct xenbus_device *dev; | |
315 | const char *nodename; | |
316 | }; | |
317 | ||
318 | static int cmp_dev(struct device *dev, void *data) | |
319 | { | |
320 | struct xenbus_device *xendev = to_xenbus_device(dev); | |
321 | struct xb_find_info *info = data; | |
322 | ||
323 | if (!strcmp(xendev->nodename, info->nodename)) { | |
324 | info->dev = xendev; | |
325 | get_device(dev); | |
326 | return 1; | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
331 | struct xenbus_device *xenbus_device_find(const char *nodename, | |
332 | struct bus_type *bus) | |
333 | { | |
334 | struct xb_find_info info = { .dev = NULL, .nodename = nodename }; | |
335 | ||
336 | bus_for_each_dev(bus, NULL, &info, cmp_dev); | |
337 | return info.dev; | |
338 | } | |
339 | ||
340 | static int cleanup_dev(struct device *dev, void *data) | |
341 | { | |
342 | struct xenbus_device *xendev = to_xenbus_device(dev); | |
343 | struct xb_find_info *info = data; | |
344 | int len = strlen(info->nodename); | |
345 | ||
346 | DPRINTK("%s", info->nodename); | |
347 | ||
348 | /* Match the info->nodename path, or any subdirectory of that path. */ | |
349 | if (strncmp(xendev->nodename, info->nodename, len)) | |
350 | return 0; | |
351 | ||
352 | /* If the node name is longer, ensure it really is a subdirectory. */ | |
353 | if ((strlen(xendev->nodename) > len) && (xendev->nodename[len] != '/')) | |
354 | return 0; | |
355 | ||
356 | info->dev = xendev; | |
357 | get_device(dev); | |
358 | return 1; | |
359 | } | |
360 | ||
361 | static void xenbus_cleanup_devices(const char *path, struct bus_type *bus) | |
362 | { | |
363 | struct xb_find_info info = { .nodename = path }; | |
364 | ||
365 | do { | |
366 | info.dev = NULL; | |
367 | bus_for_each_dev(bus, NULL, &info, cleanup_dev); | |
368 | if (info.dev) { | |
369 | device_unregister(&info.dev->dev); | |
370 | put_device(&info.dev->dev); | |
371 | } | |
372 | } while (info.dev); | |
373 | } | |
374 | ||
375 | static void xenbus_dev_release(struct device *dev) | |
376 | { | |
377 | if (dev) | |
378 | kfree(to_xenbus_device(dev)); | |
379 | } | |
380 | ||
cc85e933 BB |
381 | static ssize_t nodename_show(struct device *dev, |
382 | struct device_attribute *attr, char *buf) | |
4bac07c9 JF |
383 | { |
384 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->nodename); | |
385 | } | |
4bac07c9 | 386 | |
cc85e933 BB |
387 | static ssize_t devtype_show(struct device *dev, |
388 | struct device_attribute *attr, char *buf) | |
4bac07c9 JF |
389 | { |
390 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->devicetype); | |
391 | } | |
4bac07c9 | 392 | |
cc85e933 BB |
393 | static ssize_t modalias_show(struct device *dev, |
394 | struct device_attribute *attr, char *buf) | |
d2f0c52b | 395 | { |
149bb2fa BB |
396 | return sprintf(buf, "%s:%s\n", dev->bus->name, |
397 | to_xenbus_device(dev)->devicetype); | |
d2f0c52b | 398 | } |
cc85e933 BB |
399 | |
400 | struct device_attribute xenbus_dev_attrs[] = { | |
401 | __ATTR_RO(nodename), | |
402 | __ATTR_RO(devtype), | |
403 | __ATTR_RO(modalias), | |
404 | __ATTR_NULL | |
405 | }; | |
406 | EXPORT_SYMBOL_GPL(xenbus_dev_attrs); | |
4bac07c9 JF |
407 | |
408 | int xenbus_probe_node(struct xen_bus_type *bus, | |
409 | const char *type, | |
410 | const char *nodename) | |
411 | { | |
2a678cc5 | 412 | char devname[XEN_BUS_ID_SIZE]; |
4bac07c9 JF |
413 | int err; |
414 | struct xenbus_device *xendev; | |
415 | size_t stringlen; | |
416 | char *tmpstring; | |
417 | ||
418 | enum xenbus_state state = xenbus_read_driver_state(nodename); | |
419 | ||
420 | if (state != XenbusStateInitialising) { | |
421 | /* Device is not new, so ignore it. This can happen if a | |
422 | device is going away after switching to Closed. */ | |
423 | return 0; | |
424 | } | |
425 | ||
426 | stringlen = strlen(nodename) + 1 + strlen(type) + 1; | |
427 | xendev = kzalloc(sizeof(*xendev) + stringlen, GFP_KERNEL); | |
428 | if (!xendev) | |
429 | return -ENOMEM; | |
430 | ||
431 | xendev->state = XenbusStateInitialising; | |
432 | ||
433 | /* Copy the strings into the extra space. */ | |
434 | ||
435 | tmpstring = (char *)(xendev + 1); | |
436 | strcpy(tmpstring, nodename); | |
437 | xendev->nodename = tmpstring; | |
438 | ||
439 | tmpstring += strlen(tmpstring) + 1; | |
440 | strcpy(tmpstring, type); | |
441 | xendev->devicetype = tmpstring; | |
442 | init_completion(&xendev->down); | |
443 | ||
444 | xendev->dev.bus = &bus->bus; | |
445 | xendev->dev.release = xenbus_dev_release; | |
446 | ||
2a678cc5 | 447 | err = bus->get_bus_id(devname, xendev->nodename); |
4bac07c9 JF |
448 | if (err) |
449 | goto fail; | |
450 | ||
2a678cc5 KS |
451 | dev_set_name(&xendev->dev, devname); |
452 | ||
4bac07c9 JF |
453 | /* Register with generic device framework. */ |
454 | err = device_register(&xendev->dev); | |
455 | if (err) | |
456 | goto fail; | |
457 | ||
4bac07c9 | 458 | return 0; |
4bac07c9 JF |
459 | fail: |
460 | kfree(xendev); | |
461 | return err; | |
462 | } | |
2de06cc1 | 463 | EXPORT_SYMBOL_GPL(xenbus_probe_node); |
4bac07c9 JF |
464 | |
465 | static int xenbus_probe_device_type(struct xen_bus_type *bus, const char *type) | |
466 | { | |
467 | int err = 0; | |
468 | char **dir; | |
469 | unsigned int dir_n = 0; | |
470 | int i; | |
471 | ||
472 | dir = xenbus_directory(XBT_NIL, bus->root, type, &dir_n); | |
a39bda27 | 473 | if (IS_ERR(dir)) |
4bac07c9 JF |
474 | return PTR_ERR(dir); |
475 | ||
476 | for (i = 0; i < dir_n; i++) { | |
2de06cc1 | 477 | err = bus->probe(bus, type, dir[i]); |
a39bda27 | 478 | if (err) |
4bac07c9 JF |
479 | break; |
480 | } | |
a39bda27 | 481 | |
4bac07c9 JF |
482 | kfree(dir); |
483 | return err; | |
484 | } | |
485 | ||
486 | int xenbus_probe_devices(struct xen_bus_type *bus) | |
487 | { | |
488 | int err = 0; | |
489 | char **dir; | |
490 | unsigned int i, dir_n; | |
491 | ||
492 | dir = xenbus_directory(XBT_NIL, bus->root, "", &dir_n); | |
a39bda27 | 493 | if (IS_ERR(dir)) |
4bac07c9 JF |
494 | return PTR_ERR(dir); |
495 | ||
496 | for (i = 0; i < dir_n; i++) { | |
497 | err = xenbus_probe_device_type(bus, dir[i]); | |
a39bda27 | 498 | if (err) |
4bac07c9 JF |
499 | break; |
500 | } | |
a39bda27 | 501 | |
4bac07c9 JF |
502 | kfree(dir); |
503 | return err; | |
504 | } | |
2de06cc1 | 505 | EXPORT_SYMBOL_GPL(xenbus_probe_devices); |
4bac07c9 JF |
506 | |
507 | static unsigned int char_count(const char *str, char c) | |
508 | { | |
509 | unsigned int i, ret = 0; | |
510 | ||
511 | for (i = 0; str[i]; i++) | |
512 | if (str[i] == c) | |
513 | ret++; | |
514 | return ret; | |
515 | } | |
516 | ||
517 | static int strsep_len(const char *str, char c, unsigned int len) | |
518 | { | |
519 | unsigned int i; | |
520 | ||
521 | for (i = 0; str[i]; i++) | |
522 | if (str[i] == c) { | |
523 | if (len == 0) | |
524 | return i; | |
525 | len--; | |
526 | } | |
527 | return (len == 0) ? i : -ERANGE; | |
528 | } | |
529 | ||
530 | void xenbus_dev_changed(const char *node, struct xen_bus_type *bus) | |
531 | { | |
532 | int exists, rootlen; | |
533 | struct xenbus_device *dev; | |
2a678cc5 | 534 | char type[XEN_BUS_ID_SIZE]; |
4bac07c9 JF |
535 | const char *p, *root; |
536 | ||
537 | if (char_count(node, '/') < 2) | |
538 | return; | |
539 | ||
540 | exists = xenbus_exists(XBT_NIL, node, ""); | |
541 | if (!exists) { | |
542 | xenbus_cleanup_devices(node, &bus->bus); | |
543 | return; | |
544 | } | |
545 | ||
546 | /* backend/<type>/... or device/<type>/... */ | |
547 | p = strchr(node, '/') + 1; | |
2a678cc5 KS |
548 | snprintf(type, XEN_BUS_ID_SIZE, "%.*s", (int)strcspn(p, "/"), p); |
549 | type[XEN_BUS_ID_SIZE-1] = '\0'; | |
4bac07c9 JF |
550 | |
551 | rootlen = strsep_len(node, '/', bus->levels); | |
552 | if (rootlen < 0) | |
553 | return; | |
554 | root = kasprintf(GFP_KERNEL, "%.*s", rootlen, node); | |
555 | if (!root) | |
556 | return; | |
557 | ||
558 | dev = xenbus_device_find(root, &bus->bus); | |
559 | if (!dev) | |
560 | xenbus_probe_node(bus, type, root); | |
561 | else | |
562 | put_device(&dev->dev); | |
563 | ||
564 | kfree(root); | |
565 | } | |
c6a960ce | 566 | EXPORT_SYMBOL_GPL(xenbus_dev_changed); |
4bac07c9 | 567 | |
c7853aea | 568 | int xenbus_dev_suspend(struct device *dev) |
4bac07c9 JF |
569 | { |
570 | int err = 0; | |
571 | struct xenbus_driver *drv; | |
6bac7f9f IC |
572 | struct xenbus_device *xdev |
573 | = container_of(dev, struct xenbus_device, dev); | |
4bac07c9 | 574 | |
2de06cc1 | 575 | DPRINTK("%s", xdev->nodename); |
4bac07c9 JF |
576 | |
577 | if (dev->driver == NULL) | |
578 | return 0; | |
579 | drv = to_xenbus_driver(dev->driver); | |
4bac07c9 | 580 | if (drv->suspend) |
c7853aea | 581 | err = drv->suspend(xdev); |
4bac07c9 JF |
582 | if (err) |
583 | printk(KERN_WARNING | |
2a678cc5 | 584 | "xenbus: suspend %s failed: %i\n", dev_name(dev), err); |
4bac07c9 JF |
585 | return 0; |
586 | } | |
2de06cc1 | 587 | EXPORT_SYMBOL_GPL(xenbus_dev_suspend); |
4bac07c9 | 588 | |
2de06cc1 | 589 | int xenbus_dev_resume(struct device *dev) |
4bac07c9 JF |
590 | { |
591 | int err; | |
592 | struct xenbus_driver *drv; | |
6bac7f9f IC |
593 | struct xenbus_device *xdev |
594 | = container_of(dev, struct xenbus_device, dev); | |
4bac07c9 | 595 | |
2de06cc1 | 596 | DPRINTK("%s", xdev->nodename); |
4bac07c9 JF |
597 | |
598 | if (dev->driver == NULL) | |
599 | return 0; | |
4bac07c9 | 600 | drv = to_xenbus_driver(dev->driver); |
4bac07c9 JF |
601 | err = talk_to_otherend(xdev); |
602 | if (err) { | |
603 | printk(KERN_WARNING | |
604 | "xenbus: resume (talk_to_otherend) %s failed: %i\n", | |
2a678cc5 | 605 | dev_name(dev), err); |
4bac07c9 JF |
606 | return err; |
607 | } | |
608 | ||
609 | xdev->state = XenbusStateInitialising; | |
610 | ||
611 | if (drv->resume) { | |
612 | err = drv->resume(xdev); | |
613 | if (err) { | |
614 | printk(KERN_WARNING | |
615 | "xenbus: resume %s failed: %i\n", | |
2a678cc5 | 616 | dev_name(dev), err); |
4bac07c9 JF |
617 | return err; |
618 | } | |
619 | } | |
620 | ||
621 | err = watch_otherend(xdev); | |
622 | if (err) { | |
623 | printk(KERN_WARNING | |
624 | "xenbus_probe: resume (watch_otherend) %s failed: " | |
2a678cc5 | 625 | "%d.\n", dev_name(dev), err); |
4bac07c9 JF |
626 | return err; |
627 | } | |
628 | ||
629 | return 0; | |
630 | } | |
2de06cc1 | 631 | EXPORT_SYMBOL_GPL(xenbus_dev_resume); |
4bac07c9 | 632 | |
c7853aea KS |
633 | int xenbus_dev_cancel(struct device *dev) |
634 | { | |
635 | /* Do nothing */ | |
636 | DPRINTK("cancel"); | |
637 | return 0; | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(xenbus_dev_cancel); | |
640 | ||
4bac07c9 JF |
641 | /* A flag to determine if xenstored is 'ready' (i.e. has started) */ |
642 | int xenstored_ready = 0; | |
643 | ||
644 | ||
645 | int register_xenstore_notifier(struct notifier_block *nb) | |
646 | { | |
647 | int ret = 0; | |
648 | ||
a947f0f8 SS |
649 | if (xenstored_ready > 0) |
650 | ret = nb->notifier_call(nb, 0, NULL); | |
651 | else | |
652 | blocking_notifier_chain_register(&xenstore_chain, nb); | |
4bac07c9 JF |
653 | |
654 | return ret; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(register_xenstore_notifier); | |
657 | ||
658 | void unregister_xenstore_notifier(struct notifier_block *nb) | |
659 | { | |
660 | blocking_notifier_chain_unregister(&xenstore_chain, nb); | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(unregister_xenstore_notifier); | |
663 | ||
664 | void xenbus_probe(struct work_struct *unused) | |
665 | { | |
a947f0f8 | 666 | xenstored_ready = 1; |
4bac07c9 | 667 | |
4bac07c9 JF |
668 | /* Notify others that xenstore is up */ |
669 | blocking_notifier_call_chain(&xenstore_chain, 0, NULL); | |
670 | } | |
183d03cc | 671 | EXPORT_SYMBOL_GPL(xenbus_probe); |
4bac07c9 | 672 | |
183d03cc SS |
673 | static int __init xenbus_probe_initcall(void) |
674 | { | |
675 | if (!xen_domain()) | |
676 | return -ENODEV; | |
677 | ||
678 | if (xen_initial_domain() || xen_hvm_domain()) | |
679 | return 0; | |
680 | ||
681 | xenbus_probe(NULL); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | device_initcall(xenbus_probe_initcall); | |
686 | ||
e4184aaf DDG |
687 | /* Set up event channel for xenstored which is run as a local process |
688 | * (this is normally used only in dom0) | |
689 | */ | |
690 | static int __init xenstored_local_init(void) | |
4bac07c9 JF |
691 | { |
692 | int err = 0; | |
b37a56d6 | 693 | unsigned long page = 0; |
e4184aaf | 694 | struct evtchn_alloc_unbound alloc_unbound; |
4bac07c9 | 695 | |
e4184aaf DDG |
696 | /* Allocate Xenstore page */ |
697 | page = get_zeroed_page(GFP_KERNEL); | |
698 | if (!page) | |
699 | goto out_err; | |
4bac07c9 | 700 | |
e4184aaf DDG |
701 | xen_store_mfn = xen_start_info->store_mfn = |
702 | pfn_to_mfn(virt_to_phys((void *)page) >> | |
703 | PAGE_SHIFT); | |
4bac07c9 | 704 | |
e4184aaf DDG |
705 | /* Next allocate a local port which xenstored can bind to */ |
706 | alloc_unbound.dom = DOMID_SELF; | |
707 | alloc_unbound.remote_dom = DOMID_SELF; | |
b37a56d6 | 708 | |
e4184aaf DDG |
709 | err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, |
710 | &alloc_unbound); | |
711 | if (err == -ENOSYS) | |
712 | goto out_err; | |
b37a56d6 | 713 | |
e4184aaf DDG |
714 | BUG_ON(err); |
715 | xen_store_evtchn = xen_start_info->store_evtchn = | |
716 | alloc_unbound.port; | |
b37a56d6 | 717 | |
e4184aaf | 718 | return 0; |
b37a56d6 | 719 | |
e4184aaf DDG |
720 | out_err: |
721 | if (page != 0) | |
722 | free_page(page); | |
723 | return err; | |
724 | } | |
b37a56d6 | 725 | |
e4184aaf DDG |
726 | static int __init xenbus_init(void) |
727 | { | |
728 | int err = 0; | |
b37a56d6 | 729 | |
e4184aaf DDG |
730 | if (!xen_domain()) |
731 | return -ENODEV; | |
732 | ||
733 | if (xen_hvm_domain()) { | |
734 | uint64_t v = 0; | |
735 | err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); | |
736 | if (err) | |
737 | goto out_error; | |
738 | xen_store_evtchn = (int)v; | |
739 | err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); | |
740 | if (err) | |
741 | goto out_error; | |
742 | xen_store_mfn = (unsigned long)v; | |
743 | xen_store_interface = ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE); | |
4bac07c9 | 744 | } else { |
e4184aaf DDG |
745 | xen_store_evtchn = xen_start_info->store_evtchn; |
746 | xen_store_mfn = xen_start_info->store_mfn; | |
747 | if (xen_store_evtchn) | |
748 | xenstored_ready = 1; | |
749 | else { | |
750 | err = xenstored_local_init(); | |
bee6ab53 SY |
751 | if (err) |
752 | goto out_error; | |
bee6ab53 | 753 | } |
e4184aaf | 754 | xen_store_interface = mfn_to_virt(xen_store_mfn); |
4bac07c9 | 755 | } |
4bac07c9 JF |
756 | |
757 | /* Initialize the interface to xenstore. */ | |
758 | err = xs_init(); | |
759 | if (err) { | |
760 | printk(KERN_WARNING | |
761 | "XENBUS: Error initializing xenstore comms: %i\n", err); | |
2de06cc1 | 762 | goto out_error; |
4bac07c9 JF |
763 | } |
764 | ||
1107ba88 AZ |
765 | #ifdef CONFIG_XEN_COMPAT_XENFS |
766 | /* | |
767 | * Create xenfs mountpoint in /proc for compatibility with | |
768 | * utilities that expect to find "xenbus" under "/proc/xen". | |
769 | */ | |
770 | proc_mkdir("xen", NULL); | |
771 | #endif | |
772 | ||
e4184aaf | 773 | out_error: |
4bac07c9 JF |
774 | return err; |
775 | } | |
776 | ||
183d03cc | 777 | postcore_initcall(xenbus_init); |
4bac07c9 JF |
778 | |
779 | MODULE_LICENSE("GPL"); |