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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 | ||
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> | |
60 | #include <xen/page.h> | |
61 | ||
bee6ab53 SY |
62 | #include <xen/hvm.h> |
63 | ||
4bac07c9 JF |
64 | #include "xenbus_comms.h" |
65 | #include "xenbus_probe.h" | |
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 | ||
4bac07c9 JF |
77 | static unsigned long xen_store_mfn; |
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 IC |
171 | void xenbus_otherend_changed(struct xenbus_watch *watch, |
172 | const char **vec, unsigned int len, | |
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 || | |
183 | strncmp(dev->otherend, vec[XS_WATCH_PATH], | |
184 | strlen(dev->otherend))) { | |
898eb71c JP |
185 | dev_dbg(&dev->dev, "Ignoring watch at %s\n", |
186 | vec[XS_WATCH_PATH]); | |
4bac07c9 JF |
187 | return; |
188 | } | |
189 | ||
190 | state = xenbus_read_driver_state(dev->otherend); | |
191 | ||
898eb71c | 192 | dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n", |
4bac07c9 JF |
193 | state, xenbus_strstate(state), dev->otherend_watch.node, |
194 | vec[XS_WATCH_PATH]); | |
195 | ||
196 | /* | |
197 | * Ignore xenbus transitions during shutdown. This prevents us doing | |
198 | * work that can fail e.g., when the rootfs is gone. | |
199 | */ | |
200 | if (system_state > SYSTEM_RUNNING) { | |
2de06cc1 | 201 | if (ignore_on_shutdown && (state == XenbusStateClosing)) |
4bac07c9 JF |
202 | xenbus_frontend_closed(dev); |
203 | return; | |
204 | } | |
205 | ||
206 | if (drv->otherend_changed) | |
207 | drv->otherend_changed(dev, state); | |
208 | } | |
2de06cc1 | 209 | EXPORT_SYMBOL_GPL(xenbus_otherend_changed); |
4bac07c9 JF |
210 | |
211 | int xenbus_dev_probe(struct device *_dev) | |
212 | { | |
213 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
214 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); | |
215 | const struct xenbus_device_id *id; | |
216 | int err; | |
217 | ||
218 | DPRINTK("%s", dev->nodename); | |
219 | ||
220 | if (!drv->probe) { | |
221 | err = -ENODEV; | |
222 | goto fail; | |
223 | } | |
224 | ||
225 | id = match_device(drv->ids, dev); | |
226 | if (!id) { | |
227 | err = -ENODEV; | |
228 | goto fail; | |
229 | } | |
230 | ||
231 | err = talk_to_otherend(dev); | |
232 | if (err) { | |
233 | dev_warn(&dev->dev, "talk_to_otherend on %s failed.\n", | |
234 | dev->nodename); | |
235 | return err; | |
236 | } | |
237 | ||
238 | err = drv->probe(dev, id); | |
239 | if (err) | |
240 | goto fail; | |
241 | ||
242 | err = watch_otherend(dev); | |
243 | if (err) { | |
244 | dev_warn(&dev->dev, "watch_otherend on %s failed.\n", | |
245 | dev->nodename); | |
246 | return err; | |
247 | } | |
248 | ||
249 | return 0; | |
250 | fail: | |
251 | xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename); | |
252 | xenbus_switch_state(dev, XenbusStateClosed); | |
7432e4bd | 253 | return err; |
4bac07c9 | 254 | } |
2de06cc1 | 255 | EXPORT_SYMBOL_GPL(xenbus_dev_probe); |
4bac07c9 JF |
256 | |
257 | int xenbus_dev_remove(struct device *_dev) | |
258 | { | |
259 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
260 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); | |
261 | ||
262 | DPRINTK("%s", dev->nodename); | |
263 | ||
264 | free_otherend_watch(dev); | |
4bac07c9 JF |
265 | |
266 | if (drv->remove) | |
267 | drv->remove(dev); | |
268 | ||
bd0d5aa4 JB |
269 | free_otherend_details(dev); |
270 | ||
4bac07c9 JF |
271 | xenbus_switch_state(dev, XenbusStateClosed); |
272 | return 0; | |
273 | } | |
2de06cc1 | 274 | EXPORT_SYMBOL_GPL(xenbus_dev_remove); |
4bac07c9 | 275 | |
2de06cc1 | 276 | void xenbus_dev_shutdown(struct device *_dev) |
4bac07c9 JF |
277 | { |
278 | struct xenbus_device *dev = to_xenbus_device(_dev); | |
279 | unsigned long timeout = 5*HZ; | |
280 | ||
281 | DPRINTK("%s", dev->nodename); | |
282 | ||
283 | get_device(&dev->dev); | |
284 | if (dev->state != XenbusStateConnected) { | |
283c0972 JP |
285 | pr_info("%s: %s: %s != Connected, skipping\n", |
286 | __func__, dev->nodename, xenbus_strstate(dev->state)); | |
4bac07c9 JF |
287 | goto out; |
288 | } | |
289 | xenbus_switch_state(dev, XenbusStateClosing); | |
290 | timeout = wait_for_completion_timeout(&dev->down, timeout); | |
291 | if (!timeout) | |
283c0972 JP |
292 | pr_info("%s: %s timeout closing device\n", |
293 | __func__, dev->nodename); | |
4bac07c9 JF |
294 | out: |
295 | put_device(&dev->dev); | |
296 | } | |
2de06cc1 | 297 | EXPORT_SYMBOL_GPL(xenbus_dev_shutdown); |
4bac07c9 JF |
298 | |
299 | int xenbus_register_driver_common(struct xenbus_driver *drv, | |
73db144b | 300 | struct xen_bus_type *bus) |
4bac07c9 | 301 | { |
4bac07c9 | 302 | drv->driver.bus = &bus->bus; |
4bac07c9 JF |
303 | |
304 | return driver_register(&drv->driver); | |
305 | } | |
2de06cc1 | 306 | EXPORT_SYMBOL_GPL(xenbus_register_driver_common); |
4bac07c9 JF |
307 | |
308 | void xenbus_unregister_driver(struct xenbus_driver *drv) | |
309 | { | |
310 | driver_unregister(&drv->driver); | |
311 | } | |
312 | EXPORT_SYMBOL_GPL(xenbus_unregister_driver); | |
313 | ||
6913200a | 314 | struct xb_find_info { |
4bac07c9 JF |
315 | struct xenbus_device *dev; |
316 | const char *nodename; | |
317 | }; | |
318 | ||
319 | static int cmp_dev(struct device *dev, void *data) | |
320 | { | |
321 | struct xenbus_device *xendev = to_xenbus_device(dev); | |
322 | struct xb_find_info *info = data; | |
323 | ||
324 | if (!strcmp(xendev->nodename, info->nodename)) { | |
325 | info->dev = xendev; | |
326 | get_device(dev); | |
327 | return 1; | |
328 | } | |
329 | return 0; | |
330 | } | |
331 | ||
b8b0f559 KRW |
332 | static struct xenbus_device *xenbus_device_find(const char *nodename, |
333 | struct bus_type *bus) | |
4bac07c9 JF |
334 | { |
335 | struct xb_find_info info = { .dev = NULL, .nodename = nodename }; | |
336 | ||
337 | bus_for_each_dev(bus, NULL, &info, cmp_dev); | |
338 | return info.dev; | |
339 | } | |
340 | ||
341 | static int cleanup_dev(struct device *dev, void *data) | |
342 | { | |
343 | struct xenbus_device *xendev = to_xenbus_device(dev); | |
344 | struct xb_find_info *info = data; | |
345 | int len = strlen(info->nodename); | |
346 | ||
347 | DPRINTK("%s", info->nodename); | |
348 | ||
349 | /* Match the info->nodename path, or any subdirectory of that path. */ | |
350 | if (strncmp(xendev->nodename, info->nodename, len)) | |
351 | return 0; | |
352 | ||
353 | /* If the node name is longer, ensure it really is a subdirectory. */ | |
354 | if ((strlen(xendev->nodename) > len) && (xendev->nodename[len] != '/')) | |
355 | return 0; | |
356 | ||
357 | info->dev = xendev; | |
358 | get_device(dev); | |
359 | return 1; | |
360 | } | |
361 | ||
362 | static void xenbus_cleanup_devices(const char *path, struct bus_type *bus) | |
363 | { | |
364 | struct xb_find_info info = { .nodename = path }; | |
365 | ||
366 | do { | |
367 | info.dev = NULL; | |
368 | bus_for_each_dev(bus, NULL, &info, cleanup_dev); | |
369 | if (info.dev) { | |
370 | device_unregister(&info.dev->dev); | |
371 | put_device(&info.dev->dev); | |
372 | } | |
373 | } while (info.dev); | |
374 | } | |
375 | ||
376 | static void xenbus_dev_release(struct device *dev) | |
377 | { | |
378 | if (dev) | |
379 | kfree(to_xenbus_device(dev)); | |
380 | } | |
381 | ||
cc85e933 BB |
382 | static ssize_t nodename_show(struct device *dev, |
383 | struct device_attribute *attr, char *buf) | |
4bac07c9 JF |
384 | { |
385 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->nodename); | |
386 | } | |
4bac07c9 | 387 | |
cc85e933 BB |
388 | static ssize_t devtype_show(struct device *dev, |
389 | struct device_attribute *attr, char *buf) | |
4bac07c9 JF |
390 | { |
391 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->devicetype); | |
392 | } | |
4bac07c9 | 393 | |
cc85e933 BB |
394 | static ssize_t modalias_show(struct device *dev, |
395 | struct device_attribute *attr, char *buf) | |
d2f0c52b | 396 | { |
149bb2fa BB |
397 | return sprintf(buf, "%s:%s\n", dev->bus->name, |
398 | to_xenbus_device(dev)->devicetype); | |
d2f0c52b | 399 | } |
cc85e933 BB |
400 | |
401 | struct device_attribute xenbus_dev_attrs[] = { | |
402 | __ATTR_RO(nodename), | |
403 | __ATTR_RO(devtype), | |
404 | __ATTR_RO(modalias), | |
405 | __ATTR_NULL | |
406 | }; | |
407 | EXPORT_SYMBOL_GPL(xenbus_dev_attrs); | |
4bac07c9 JF |
408 | |
409 | int xenbus_probe_node(struct xen_bus_type *bus, | |
410 | const char *type, | |
411 | const char *nodename) | |
412 | { | |
2a678cc5 | 413 | char devname[XEN_BUS_ID_SIZE]; |
4bac07c9 JF |
414 | int err; |
415 | struct xenbus_device *xendev; | |
416 | size_t stringlen; | |
417 | char *tmpstring; | |
418 | ||
419 | enum xenbus_state state = xenbus_read_driver_state(nodename); | |
420 | ||
421 | if (state != XenbusStateInitialising) { | |
422 | /* Device is not new, so ignore it. This can happen if a | |
423 | device is going away after switching to Closed. */ | |
424 | return 0; | |
425 | } | |
426 | ||
427 | stringlen = strlen(nodename) + 1 + strlen(type) + 1; | |
428 | xendev = kzalloc(sizeof(*xendev) + stringlen, GFP_KERNEL); | |
429 | if (!xendev) | |
430 | return -ENOMEM; | |
431 | ||
432 | xendev->state = XenbusStateInitialising; | |
433 | ||
434 | /* Copy the strings into the extra space. */ | |
435 | ||
436 | tmpstring = (char *)(xendev + 1); | |
437 | strcpy(tmpstring, nodename); | |
438 | xendev->nodename = tmpstring; | |
439 | ||
440 | tmpstring += strlen(tmpstring) + 1; | |
441 | strcpy(tmpstring, type); | |
442 | xendev->devicetype = tmpstring; | |
443 | init_completion(&xendev->down); | |
444 | ||
445 | xendev->dev.bus = &bus->bus; | |
446 | xendev->dev.release = xenbus_dev_release; | |
447 | ||
2a678cc5 | 448 | err = bus->get_bus_id(devname, xendev->nodename); |
4bac07c9 JF |
449 | if (err) |
450 | goto fail; | |
451 | ||
02aa2a37 | 452 | dev_set_name(&xendev->dev, "%s", devname); |
2a678cc5 | 453 | |
4bac07c9 JF |
454 | /* Register with generic device framework. */ |
455 | err = device_register(&xendev->dev); | |
456 | if (err) | |
457 | goto fail; | |
458 | ||
4bac07c9 | 459 | return 0; |
4bac07c9 JF |
460 | fail: |
461 | kfree(xendev); | |
462 | return err; | |
463 | } | |
2de06cc1 | 464 | EXPORT_SYMBOL_GPL(xenbus_probe_node); |
4bac07c9 JF |
465 | |
466 | static int xenbus_probe_device_type(struct xen_bus_type *bus, const char *type) | |
467 | { | |
468 | int err = 0; | |
469 | char **dir; | |
470 | unsigned int dir_n = 0; | |
471 | int i; | |
472 | ||
473 | dir = xenbus_directory(XBT_NIL, bus->root, type, &dir_n); | |
a39bda27 | 474 | if (IS_ERR(dir)) |
4bac07c9 JF |
475 | return PTR_ERR(dir); |
476 | ||
477 | for (i = 0; i < dir_n; i++) { | |
2de06cc1 | 478 | err = bus->probe(bus, type, dir[i]); |
a39bda27 | 479 | if (err) |
4bac07c9 JF |
480 | break; |
481 | } | |
a39bda27 | 482 | |
4bac07c9 JF |
483 | kfree(dir); |
484 | return err; | |
485 | } | |
486 | ||
487 | int xenbus_probe_devices(struct xen_bus_type *bus) | |
488 | { | |
489 | int err = 0; | |
490 | char **dir; | |
491 | unsigned int i, dir_n; | |
492 | ||
493 | dir = xenbus_directory(XBT_NIL, bus->root, "", &dir_n); | |
a39bda27 | 494 | if (IS_ERR(dir)) |
4bac07c9 JF |
495 | return PTR_ERR(dir); |
496 | ||
497 | for (i = 0; i < dir_n; i++) { | |
498 | err = xenbus_probe_device_type(bus, dir[i]); | |
a39bda27 | 499 | if (err) |
4bac07c9 JF |
500 | break; |
501 | } | |
a39bda27 | 502 | |
4bac07c9 JF |
503 | kfree(dir); |
504 | return err; | |
505 | } | |
2de06cc1 | 506 | EXPORT_SYMBOL_GPL(xenbus_probe_devices); |
4bac07c9 JF |
507 | |
508 | static unsigned int char_count(const char *str, char c) | |
509 | { | |
510 | unsigned int i, ret = 0; | |
511 | ||
512 | for (i = 0; str[i]; i++) | |
513 | if (str[i] == c) | |
514 | ret++; | |
515 | return ret; | |
516 | } | |
517 | ||
518 | static int strsep_len(const char *str, char c, unsigned int len) | |
519 | { | |
520 | unsigned int i; | |
521 | ||
522 | for (i = 0; str[i]; i++) | |
523 | if (str[i] == c) { | |
524 | if (len == 0) | |
525 | return i; | |
526 | len--; | |
527 | } | |
528 | return (len == 0) ? i : -ERANGE; | |
529 | } | |
530 | ||
531 | void xenbus_dev_changed(const char *node, struct xen_bus_type *bus) | |
532 | { | |
533 | int exists, rootlen; | |
534 | struct xenbus_device *dev; | |
2a678cc5 | 535 | char type[XEN_BUS_ID_SIZE]; |
4bac07c9 JF |
536 | const char *p, *root; |
537 | ||
538 | if (char_count(node, '/') < 2) | |
539 | return; | |
540 | ||
541 | exists = xenbus_exists(XBT_NIL, node, ""); | |
542 | if (!exists) { | |
543 | xenbus_cleanup_devices(node, &bus->bus); | |
544 | return; | |
545 | } | |
546 | ||
547 | /* backend/<type>/... or device/<type>/... */ | |
548 | p = strchr(node, '/') + 1; | |
2a678cc5 KS |
549 | snprintf(type, XEN_BUS_ID_SIZE, "%.*s", (int)strcspn(p, "/"), p); |
550 | type[XEN_BUS_ID_SIZE-1] = '\0'; | |
4bac07c9 JF |
551 | |
552 | rootlen = strsep_len(node, '/', bus->levels); | |
553 | if (rootlen < 0) | |
554 | return; | |
555 | root = kasprintf(GFP_KERNEL, "%.*s", rootlen, node); | |
556 | if (!root) | |
557 | return; | |
558 | ||
559 | dev = xenbus_device_find(root, &bus->bus); | |
560 | if (!dev) | |
561 | xenbus_probe_node(bus, type, root); | |
562 | else | |
563 | put_device(&dev->dev); | |
564 | ||
565 | kfree(root); | |
566 | } | |
c6a960ce | 567 | EXPORT_SYMBOL_GPL(xenbus_dev_changed); |
4bac07c9 | 568 | |
c7853aea | 569 | int xenbus_dev_suspend(struct device *dev) |
4bac07c9 JF |
570 | { |
571 | int err = 0; | |
572 | struct xenbus_driver *drv; | |
6bac7f9f IC |
573 | struct xenbus_device *xdev |
574 | = container_of(dev, struct xenbus_device, dev); | |
4bac07c9 | 575 | |
2de06cc1 | 576 | DPRINTK("%s", xdev->nodename); |
4bac07c9 JF |
577 | |
578 | if (dev->driver == NULL) | |
579 | return 0; | |
580 | drv = to_xenbus_driver(dev->driver); | |
4bac07c9 | 581 | if (drv->suspend) |
c7853aea | 582 | err = drv->suspend(xdev); |
4bac07c9 | 583 | if (err) |
283c0972 | 584 | pr_warn("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) { | |
283c0972 JP |
603 | pr_warn("resume (talk_to_otherend) %s failed: %i\n", |
604 | dev_name(dev), err); | |
4bac07c9 JF |
605 | return err; |
606 | } | |
607 | ||
608 | xdev->state = XenbusStateInitialising; | |
609 | ||
610 | if (drv->resume) { | |
611 | err = drv->resume(xdev); | |
612 | if (err) { | |
283c0972 | 613 | pr_warn("resume %s failed: %i\n", dev_name(dev), err); |
4bac07c9 JF |
614 | return err; |
615 | } | |
616 | } | |
617 | ||
618 | err = watch_otherend(xdev); | |
619 | if (err) { | |
283c0972 JP |
620 | pr_warn("resume (watch_otherend) %s failed: %d.\n", |
621 | dev_name(dev), err); | |
4bac07c9 JF |
622 | return err; |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
2de06cc1 | 627 | EXPORT_SYMBOL_GPL(xenbus_dev_resume); |
4bac07c9 | 628 | |
c7853aea KS |
629 | int xenbus_dev_cancel(struct device *dev) |
630 | { | |
631 | /* Do nothing */ | |
632 | DPRINTK("cancel"); | |
633 | return 0; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(xenbus_dev_cancel); | |
636 | ||
4bac07c9 | 637 | /* A flag to determine if xenstored is 'ready' (i.e. has started) */ |
6913200a | 638 | int xenstored_ready; |
4bac07c9 JF |
639 | |
640 | ||
641 | int register_xenstore_notifier(struct notifier_block *nb) | |
642 | { | |
643 | int ret = 0; | |
644 | ||
a947f0f8 SS |
645 | if (xenstored_ready > 0) |
646 | ret = nb->notifier_call(nb, 0, NULL); | |
647 | else | |
648 | blocking_notifier_chain_register(&xenstore_chain, nb); | |
4bac07c9 JF |
649 | |
650 | return ret; | |
651 | } | |
652 | EXPORT_SYMBOL_GPL(register_xenstore_notifier); | |
653 | ||
654 | void unregister_xenstore_notifier(struct notifier_block *nb) | |
655 | { | |
656 | blocking_notifier_chain_unregister(&xenstore_chain, nb); | |
657 | } | |
658 | EXPORT_SYMBOL_GPL(unregister_xenstore_notifier); | |
659 | ||
660 | void xenbus_probe(struct work_struct *unused) | |
661 | { | |
a947f0f8 | 662 | xenstored_ready = 1; |
4bac07c9 | 663 | |
4bac07c9 JF |
664 | /* Notify others that xenstore is up */ |
665 | blocking_notifier_call_chain(&xenstore_chain, 0, NULL); | |
666 | } | |
183d03cc | 667 | EXPORT_SYMBOL_GPL(xenbus_probe); |
4bac07c9 | 668 | |
183d03cc SS |
669 | static int __init xenbus_probe_initcall(void) |
670 | { | |
671 | if (!xen_domain()) | |
672 | return -ENODEV; | |
673 | ||
674 | if (xen_initial_domain() || xen_hvm_domain()) | |
675 | return 0; | |
676 | ||
677 | xenbus_probe(NULL); | |
678 | return 0; | |
679 | } | |
680 | ||
681 | device_initcall(xenbus_probe_initcall); | |
682 | ||
e4184aaf DDG |
683 | /* Set up event channel for xenstored which is run as a local process |
684 | * (this is normally used only in dom0) | |
685 | */ | |
686 | static int __init xenstored_local_init(void) | |
4bac07c9 JF |
687 | { |
688 | int err = 0; | |
b37a56d6 | 689 | unsigned long page = 0; |
e4184aaf | 690 | struct evtchn_alloc_unbound alloc_unbound; |
4bac07c9 | 691 | |
e4184aaf DDG |
692 | /* Allocate Xenstore page */ |
693 | page = get_zeroed_page(GFP_KERNEL); | |
694 | if (!page) | |
695 | goto out_err; | |
4bac07c9 | 696 | |
e4184aaf DDG |
697 | xen_store_mfn = xen_start_info->store_mfn = |
698 | pfn_to_mfn(virt_to_phys((void *)page) >> | |
699 | PAGE_SHIFT); | |
4bac07c9 | 700 | |
e4184aaf DDG |
701 | /* Next allocate a local port which xenstored can bind to */ |
702 | alloc_unbound.dom = DOMID_SELF; | |
703 | alloc_unbound.remote_dom = DOMID_SELF; | |
b37a56d6 | 704 | |
e4184aaf DDG |
705 | err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, |
706 | &alloc_unbound); | |
707 | if (err == -ENOSYS) | |
708 | goto out_err; | |
b37a56d6 | 709 | |
e4184aaf DDG |
710 | BUG_ON(err); |
711 | xen_store_evtchn = xen_start_info->store_evtchn = | |
712 | alloc_unbound.port; | |
b37a56d6 | 713 | |
e4184aaf | 714 | return 0; |
b37a56d6 | 715 | |
e4184aaf DDG |
716 | out_err: |
717 | if (page != 0) | |
718 | free_page(page); | |
719 | return err; | |
720 | } | |
b37a56d6 | 721 | |
e4184aaf DDG |
722 | static int __init xenbus_init(void) |
723 | { | |
724 | int err = 0; | |
ecc635f9 | 725 | uint64_t v = 0; |
33c1174b | 726 | xen_store_domain_type = XS_UNKNOWN; |
b37a56d6 | 727 | |
e4184aaf DDG |
728 | if (!xen_domain()) |
729 | return -ENODEV; | |
730 | ||
2c5d37d3 DDG |
731 | xenbus_ring_ops_init(); |
732 | ||
ecc635f9 | 733 | if (xen_pv_domain()) |
33c1174b | 734 | xen_store_domain_type = XS_PV; |
ecc635f9 | 735 | if (xen_hvm_domain()) |
33c1174b | 736 | xen_store_domain_type = XS_HVM; |
ecc635f9 | 737 | if (xen_hvm_domain() && xen_initial_domain()) |
33c1174b | 738 | xen_store_domain_type = XS_LOCAL; |
ecc635f9 | 739 | if (xen_pv_domain() && !xen_start_info->store_evtchn) |
33c1174b | 740 | xen_store_domain_type = XS_LOCAL; |
ecc635f9 SS |
741 | if (xen_pv_domain() && xen_start_info->store_evtchn) |
742 | xenstored_ready = 1; | |
743 | ||
33c1174b AC |
744 | switch (xen_store_domain_type) { |
745 | case XS_LOCAL: | |
ecc635f9 SS |
746 | err = xenstored_local_init(); |
747 | if (err) | |
748 | goto out_error; | |
749 | xen_store_interface = mfn_to_virt(xen_store_mfn); | |
750 | break; | |
33c1174b | 751 | case XS_PV: |
ecc635f9 SS |
752 | xen_store_evtchn = xen_start_info->store_evtchn; |
753 | xen_store_mfn = xen_start_info->store_mfn; | |
754 | xen_store_interface = mfn_to_virt(xen_store_mfn); | |
755 | break; | |
33c1174b | 756 | case XS_HVM: |
e4184aaf DDG |
757 | err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); |
758 | if (err) | |
759 | goto out_error; | |
760 | xen_store_evtchn = (int)v; | |
761 | err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); | |
762 | if (err) | |
763 | goto out_error; | |
764 | xen_store_mfn = (unsigned long)v; | |
ecc635f9 | 765 | xen_store_interface = |
3216dceb | 766 | xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE); |
ecc635f9 SS |
767 | break; |
768 | default: | |
769 | pr_warn("Xenstore state unknown\n"); | |
770 | break; | |
4bac07c9 | 771 | } |
4bac07c9 JF |
772 | |
773 | /* Initialize the interface to xenstore. */ | |
774 | err = xs_init(); | |
775 | if (err) { | |
283c0972 | 776 | pr_warn("Error initializing xenstore comms: %i\n", err); |
2de06cc1 | 777 | goto out_error; |
4bac07c9 JF |
778 | } |
779 | ||
1107ba88 AZ |
780 | #ifdef CONFIG_XEN_COMPAT_XENFS |
781 | /* | |
782 | * Create xenfs mountpoint in /proc for compatibility with | |
783 | * utilities that expect to find "xenbus" under "/proc/xen". | |
784 | */ | |
785 | proc_mkdir("xen", NULL); | |
786 | #endif | |
787 | ||
6913200a | 788 | out_error: |
4bac07c9 JF |
789 | return err; |
790 | } | |
791 | ||
183d03cc | 792 | postcore_initcall(xenbus_init); |
4bac07c9 JF |
793 | |
794 | MODULE_LICENSE("GPL"); |