Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 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> |
Alex Zeffertt | 1107ba8 | 2009-01-07 18:07:11 -0800 | [diff] [blame] | 43 | #include <linux/proc_fs.h> |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 44 | #include <linux/notifier.h> |
| 45 | #include <linux/kthread.h> |
| 46 | #include <linux/mutex.h> |
| 47 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 48 | #include <linux/slab.h> |
Paul Gortmaker | 72ee511 | 2011-07-03 16:20:57 -0400 | [diff] [blame] | 49 | #include <linux/module.h> |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 50 | |
| 51 | #include <asm/page.h> |
| 52 | #include <asm/pgtable.h> |
| 53 | #include <asm/xen/hypervisor.h> |
Jeremy Fitzhardinge | 1ccbf53 | 2009-10-06 15:11:14 -0700 | [diff] [blame] | 54 | |
| 55 | #include <xen/xen.h> |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 56 | #include <xen/xenbus.h> |
| 57 | #include <xen/events.h> |
| 58 | #include <xen/page.h> |
| 59 | |
Sheng Yang | bee6ab5 | 2010-05-14 12:39:33 +0100 | [diff] [blame] | 60 | #include <xen/hvm.h> |
| 61 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 62 | #include "xenbus_comms.h" |
| 63 | #include "xenbus_probe.h" |
| 64 | |
Alex Zeffertt | 1107ba8 | 2009-01-07 18:07:11 -0800 | [diff] [blame] | 65 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 66 | int xen_store_evtchn; |
Jeremy Fitzhardinge | 8e3e999 | 2009-03-21 23:51:26 -0700 | [diff] [blame] | 67 | EXPORT_SYMBOL_GPL(xen_store_evtchn); |
Alex Zeffertt | 1107ba8 | 2009-01-07 18:07:11 -0800 | [diff] [blame] | 68 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 69 | struct xenstore_domain_interface *xen_store_interface; |
Jeremy Fitzhardinge | 8e3e999 | 2009-03-21 23:51:26 -0700 | [diff] [blame] | 70 | EXPORT_SYMBOL_GPL(xen_store_interface); |
| 71 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 72 | static unsigned long xen_store_mfn; |
| 73 | |
| 74 | static BLOCKING_NOTIFIER_HEAD(xenstore_chain); |
| 75 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 76 | /* If something in array of ids matches this device, return it. */ |
| 77 | static const struct xenbus_device_id * |
| 78 | match_device(const struct xenbus_device_id *arr, struct xenbus_device *dev) |
| 79 | { |
| 80 | for (; *arr->devicetype != '\0'; arr++) { |
| 81 | if (!strcmp(arr->devicetype, dev->devicetype)) |
| 82 | return arr; |
| 83 | } |
| 84 | return NULL; |
| 85 | } |
| 86 | |
| 87 | int xenbus_match(struct device *_dev, struct device_driver *_drv) |
| 88 | { |
| 89 | struct xenbus_driver *drv = to_xenbus_driver(_drv); |
| 90 | |
| 91 | if (!drv->ids) |
| 92 | return 0; |
| 93 | |
| 94 | return match_device(drv->ids, to_xenbus_device(_dev)) != NULL; |
| 95 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 96 | EXPORT_SYMBOL_GPL(xenbus_match); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 97 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 98 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 99 | static void free_otherend_details(struct xenbus_device *dev) |
| 100 | { |
| 101 | kfree(dev->otherend); |
| 102 | dev->otherend = NULL; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static void free_otherend_watch(struct xenbus_device *dev) |
| 107 | { |
| 108 | if (dev->otherend_watch.node) { |
| 109 | unregister_xenbus_watch(&dev->otherend_watch); |
| 110 | kfree(dev->otherend_watch.node); |
| 111 | dev->otherend_watch.node = NULL; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 116 | static int talk_to_otherend(struct xenbus_device *dev) |
| 117 | { |
| 118 | struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver); |
| 119 | |
| 120 | free_otherend_watch(dev); |
| 121 | free_otherend_details(dev); |
| 122 | |
| 123 | return drv->read_otherend_details(dev); |
| 124 | } |
| 125 | |
| 126 | |
| 127 | |
| 128 | static int watch_otherend(struct xenbus_device *dev) |
| 129 | { |
Ian Campbell | 6bac7f9 | 2010-12-10 14:39:15 +0000 | [diff] [blame] | 130 | struct xen_bus_type *bus = |
| 131 | container_of(dev->dev.bus, struct xen_bus_type, bus); |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 132 | |
Ian Campbell | 6bac7f9 | 2010-12-10 14:39:15 +0000 | [diff] [blame] | 133 | return xenbus_watch_pathfmt(dev, &dev->otherend_watch, |
| 134 | bus->otherend_changed, |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 135 | "%s/%s", dev->otherend, "state"); |
| 136 | } |
| 137 | |
| 138 | |
| 139 | int xenbus_read_otherend_details(struct xenbus_device *xendev, |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 140 | char *id_node, char *path_node) |
| 141 | { |
| 142 | int err = xenbus_gather(XBT_NIL, xendev->nodename, |
| 143 | id_node, "%i", &xendev->otherend_id, |
| 144 | path_node, NULL, &xendev->otherend, |
| 145 | NULL); |
| 146 | if (err) { |
| 147 | xenbus_dev_fatal(xendev, err, |
| 148 | "reading other end details from %s", |
| 149 | xendev->nodename); |
| 150 | return err; |
| 151 | } |
| 152 | if (strlen(xendev->otherend) == 0 || |
| 153 | !xenbus_exists(XBT_NIL, xendev->otherend, "")) { |
| 154 | xenbus_dev_fatal(xendev, -ENOENT, |
| 155 | "unable to read other end from %s. " |
| 156 | "missing or inaccessible.", |
| 157 | xendev->nodename); |
| 158 | free_otherend_details(xendev); |
| 159 | return -ENOENT; |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 164 | EXPORT_SYMBOL_GPL(xenbus_read_otherend_details); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 165 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 166 | void xenbus_otherend_changed(struct xenbus_watch *watch, |
| 167 | const char **vec, unsigned int len, |
| 168 | int ignore_on_shutdown) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 169 | { |
| 170 | struct xenbus_device *dev = |
| 171 | container_of(watch, struct xenbus_device, otherend_watch); |
| 172 | struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver); |
| 173 | enum xenbus_state state; |
| 174 | |
| 175 | /* Protect us against watches firing on old details when the otherend |
| 176 | details change, say immediately after a resume. */ |
| 177 | if (!dev->otherend || |
| 178 | strncmp(dev->otherend, vec[XS_WATCH_PATH], |
| 179 | strlen(dev->otherend))) { |
Joe Perches | 898eb71 | 2007-10-18 03:06:30 -0700 | [diff] [blame] | 180 | dev_dbg(&dev->dev, "Ignoring watch at %s\n", |
| 181 | vec[XS_WATCH_PATH]); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 182 | return; |
| 183 | } |
| 184 | |
| 185 | state = xenbus_read_driver_state(dev->otherend); |
| 186 | |
Joe Perches | 898eb71 | 2007-10-18 03:06:30 -0700 | [diff] [blame] | 187 | dev_dbg(&dev->dev, "state is %d, (%s), %s, %s\n", |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 188 | state, xenbus_strstate(state), dev->otherend_watch.node, |
| 189 | vec[XS_WATCH_PATH]); |
| 190 | |
| 191 | /* |
| 192 | * Ignore xenbus transitions during shutdown. This prevents us doing |
| 193 | * work that can fail e.g., when the rootfs is gone. |
| 194 | */ |
| 195 | if (system_state > SYSTEM_RUNNING) { |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 196 | if (ignore_on_shutdown && (state == XenbusStateClosing)) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 197 | xenbus_frontend_closed(dev); |
| 198 | return; |
| 199 | } |
| 200 | |
| 201 | if (drv->otherend_changed) |
| 202 | drv->otherend_changed(dev, state); |
| 203 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 204 | EXPORT_SYMBOL_GPL(xenbus_otherend_changed); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 205 | |
| 206 | int xenbus_dev_probe(struct device *_dev) |
| 207 | { |
| 208 | struct xenbus_device *dev = to_xenbus_device(_dev); |
| 209 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); |
| 210 | const struct xenbus_device_id *id; |
| 211 | int err; |
| 212 | |
| 213 | DPRINTK("%s", dev->nodename); |
| 214 | |
| 215 | if (!drv->probe) { |
| 216 | err = -ENODEV; |
| 217 | goto fail; |
| 218 | } |
| 219 | |
| 220 | id = match_device(drv->ids, dev); |
| 221 | if (!id) { |
| 222 | err = -ENODEV; |
| 223 | goto fail; |
| 224 | } |
| 225 | |
| 226 | err = talk_to_otherend(dev); |
| 227 | if (err) { |
| 228 | dev_warn(&dev->dev, "talk_to_otherend on %s failed.\n", |
| 229 | dev->nodename); |
| 230 | return err; |
| 231 | } |
| 232 | |
| 233 | err = drv->probe(dev, id); |
| 234 | if (err) |
| 235 | goto fail; |
| 236 | |
| 237 | err = watch_otherend(dev); |
| 238 | if (err) { |
| 239 | dev_warn(&dev->dev, "watch_otherend on %s failed.\n", |
| 240 | dev->nodename); |
| 241 | return err; |
| 242 | } |
| 243 | |
| 244 | return 0; |
| 245 | fail: |
| 246 | xenbus_dev_error(dev, err, "xenbus_dev_probe on %s", dev->nodename); |
| 247 | xenbus_switch_state(dev, XenbusStateClosed); |
Jeremy Fitzhardinge | 7432e4b | 2009-10-29 14:19:42 -0700 | [diff] [blame] | 248 | return err; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 249 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 250 | EXPORT_SYMBOL_GPL(xenbus_dev_probe); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 251 | |
| 252 | int xenbus_dev_remove(struct device *_dev) |
| 253 | { |
| 254 | struct xenbus_device *dev = to_xenbus_device(_dev); |
| 255 | struct xenbus_driver *drv = to_xenbus_driver(_dev->driver); |
| 256 | |
| 257 | DPRINTK("%s", dev->nodename); |
| 258 | |
| 259 | free_otherend_watch(dev); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 260 | |
| 261 | if (drv->remove) |
| 262 | drv->remove(dev); |
| 263 | |
Jan Beulich | bd0d5aa | 2012-03-05 17:11:31 +0000 | [diff] [blame] | 264 | free_otherend_details(dev); |
| 265 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 266 | xenbus_switch_state(dev, XenbusStateClosed); |
| 267 | return 0; |
| 268 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 269 | EXPORT_SYMBOL_GPL(xenbus_dev_remove); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 270 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 271 | void xenbus_dev_shutdown(struct device *_dev) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 272 | { |
| 273 | struct xenbus_device *dev = to_xenbus_device(_dev); |
| 274 | unsigned long timeout = 5*HZ; |
| 275 | |
| 276 | DPRINTK("%s", dev->nodename); |
| 277 | |
| 278 | get_device(&dev->dev); |
| 279 | if (dev->state != XenbusStateConnected) { |
| 280 | printk(KERN_INFO "%s: %s: %s != Connected, skipping\n", __func__, |
| 281 | dev->nodename, xenbus_strstate(dev->state)); |
| 282 | goto out; |
| 283 | } |
| 284 | xenbus_switch_state(dev, XenbusStateClosing); |
| 285 | timeout = wait_for_completion_timeout(&dev->down, timeout); |
| 286 | if (!timeout) |
| 287 | printk(KERN_INFO "%s: %s timeout closing device\n", |
| 288 | __func__, dev->nodename); |
| 289 | out: |
| 290 | put_device(&dev->dev); |
| 291 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 292 | EXPORT_SYMBOL_GPL(xenbus_dev_shutdown); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 293 | |
| 294 | int xenbus_register_driver_common(struct xenbus_driver *drv, |
Jan Beulich | 73db144 | 2011-12-22 09:08:13 +0000 | [diff] [blame] | 295 | struct xen_bus_type *bus) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 296 | { |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 297 | drv->driver.bus = &bus->bus; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 298 | |
| 299 | return driver_register(&drv->driver); |
| 300 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 301 | EXPORT_SYMBOL_GPL(xenbus_register_driver_common); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 302 | |
| 303 | void xenbus_unregister_driver(struct xenbus_driver *drv) |
| 304 | { |
| 305 | driver_unregister(&drv->driver); |
| 306 | } |
| 307 | EXPORT_SYMBOL_GPL(xenbus_unregister_driver); |
| 308 | |
Ruslan Pisarev | 6913200 | 2011-07-26 14:17:23 +0300 | [diff] [blame] | 309 | struct xb_find_info { |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 310 | struct xenbus_device *dev; |
| 311 | const char *nodename; |
| 312 | }; |
| 313 | |
| 314 | static int cmp_dev(struct device *dev, void *data) |
| 315 | { |
| 316 | struct xenbus_device *xendev = to_xenbus_device(dev); |
| 317 | struct xb_find_info *info = data; |
| 318 | |
| 319 | if (!strcmp(xendev->nodename, info->nodename)) { |
| 320 | info->dev = xendev; |
| 321 | get_device(dev); |
| 322 | return 1; |
| 323 | } |
| 324 | return 0; |
| 325 | } |
| 326 | |
Konrad Rzeszutek Wilk | b8b0f55 | 2012-08-21 14:49:34 -0400 | [diff] [blame] | 327 | static struct xenbus_device *xenbus_device_find(const char *nodename, |
| 328 | struct bus_type *bus) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 329 | { |
| 330 | struct xb_find_info info = { .dev = NULL, .nodename = nodename }; |
| 331 | |
| 332 | bus_for_each_dev(bus, NULL, &info, cmp_dev); |
| 333 | return info.dev; |
| 334 | } |
| 335 | |
| 336 | static int cleanup_dev(struct device *dev, void *data) |
| 337 | { |
| 338 | struct xenbus_device *xendev = to_xenbus_device(dev); |
| 339 | struct xb_find_info *info = data; |
| 340 | int len = strlen(info->nodename); |
| 341 | |
| 342 | DPRINTK("%s", info->nodename); |
| 343 | |
| 344 | /* Match the info->nodename path, or any subdirectory of that path. */ |
| 345 | if (strncmp(xendev->nodename, info->nodename, len)) |
| 346 | return 0; |
| 347 | |
| 348 | /* If the node name is longer, ensure it really is a subdirectory. */ |
| 349 | if ((strlen(xendev->nodename) > len) && (xendev->nodename[len] != '/')) |
| 350 | return 0; |
| 351 | |
| 352 | info->dev = xendev; |
| 353 | get_device(dev); |
| 354 | return 1; |
| 355 | } |
| 356 | |
| 357 | static void xenbus_cleanup_devices(const char *path, struct bus_type *bus) |
| 358 | { |
| 359 | struct xb_find_info info = { .nodename = path }; |
| 360 | |
| 361 | do { |
| 362 | info.dev = NULL; |
| 363 | bus_for_each_dev(bus, NULL, &info, cleanup_dev); |
| 364 | if (info.dev) { |
| 365 | device_unregister(&info.dev->dev); |
| 366 | put_device(&info.dev->dev); |
| 367 | } |
| 368 | } while (info.dev); |
| 369 | } |
| 370 | |
| 371 | static void xenbus_dev_release(struct device *dev) |
| 372 | { |
| 373 | if (dev) |
| 374 | kfree(to_xenbus_device(dev)); |
| 375 | } |
| 376 | |
Bastian Blank | cc85e93 | 2011-06-29 14:39:26 +0200 | [diff] [blame] | 377 | static ssize_t nodename_show(struct device *dev, |
| 378 | struct device_attribute *attr, char *buf) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 379 | { |
| 380 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->nodename); |
| 381 | } |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 382 | |
Bastian Blank | cc85e93 | 2011-06-29 14:39:26 +0200 | [diff] [blame] | 383 | static ssize_t devtype_show(struct device *dev, |
| 384 | struct device_attribute *attr, char *buf) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 385 | { |
| 386 | return sprintf(buf, "%s\n", to_xenbus_device(dev)->devicetype); |
| 387 | } |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 388 | |
Bastian Blank | cc85e93 | 2011-06-29 14:39:26 +0200 | [diff] [blame] | 389 | static ssize_t modalias_show(struct device *dev, |
| 390 | struct device_attribute *attr, char *buf) |
Mark McLoughlin | d2f0c52 | 2008-04-02 10:54:05 -0700 | [diff] [blame] | 391 | { |
Bastian Blank | 149bb2f | 2011-06-29 14:40:08 +0200 | [diff] [blame] | 392 | return sprintf(buf, "%s:%s\n", dev->bus->name, |
| 393 | to_xenbus_device(dev)->devicetype); |
Mark McLoughlin | d2f0c52 | 2008-04-02 10:54:05 -0700 | [diff] [blame] | 394 | } |
Bastian Blank | cc85e93 | 2011-06-29 14:39:26 +0200 | [diff] [blame] | 395 | |
| 396 | struct device_attribute xenbus_dev_attrs[] = { |
| 397 | __ATTR_RO(nodename), |
| 398 | __ATTR_RO(devtype), |
| 399 | __ATTR_RO(modalias), |
| 400 | __ATTR_NULL |
| 401 | }; |
| 402 | EXPORT_SYMBOL_GPL(xenbus_dev_attrs); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 403 | |
| 404 | int xenbus_probe_node(struct xen_bus_type *bus, |
| 405 | const char *type, |
| 406 | const char *nodename) |
| 407 | { |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 408 | char devname[XEN_BUS_ID_SIZE]; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 409 | int err; |
| 410 | struct xenbus_device *xendev; |
| 411 | size_t stringlen; |
| 412 | char *tmpstring; |
| 413 | |
| 414 | enum xenbus_state state = xenbus_read_driver_state(nodename); |
| 415 | |
| 416 | if (state != XenbusStateInitialising) { |
| 417 | /* Device is not new, so ignore it. This can happen if a |
| 418 | device is going away after switching to Closed. */ |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | stringlen = strlen(nodename) + 1 + strlen(type) + 1; |
| 423 | xendev = kzalloc(sizeof(*xendev) + stringlen, GFP_KERNEL); |
| 424 | if (!xendev) |
| 425 | return -ENOMEM; |
| 426 | |
| 427 | xendev->state = XenbusStateInitialising; |
| 428 | |
| 429 | /* Copy the strings into the extra space. */ |
| 430 | |
| 431 | tmpstring = (char *)(xendev + 1); |
| 432 | strcpy(tmpstring, nodename); |
| 433 | xendev->nodename = tmpstring; |
| 434 | |
| 435 | tmpstring += strlen(tmpstring) + 1; |
| 436 | strcpy(tmpstring, type); |
| 437 | xendev->devicetype = tmpstring; |
| 438 | init_completion(&xendev->down); |
| 439 | |
| 440 | xendev->dev.bus = &bus->bus; |
| 441 | xendev->dev.release = xenbus_dev_release; |
| 442 | |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 443 | err = bus->get_bus_id(devname, xendev->nodename); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 444 | if (err) |
| 445 | goto fail; |
| 446 | |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 447 | dev_set_name(&xendev->dev, devname); |
| 448 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 449 | /* Register with generic device framework. */ |
| 450 | err = device_register(&xendev->dev); |
| 451 | if (err) |
| 452 | goto fail; |
| 453 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 454 | return 0; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 455 | fail: |
| 456 | kfree(xendev); |
| 457 | return err; |
| 458 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 459 | EXPORT_SYMBOL_GPL(xenbus_probe_node); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 460 | |
| 461 | static int xenbus_probe_device_type(struct xen_bus_type *bus, const char *type) |
| 462 | { |
| 463 | int err = 0; |
| 464 | char **dir; |
| 465 | unsigned int dir_n = 0; |
| 466 | int i; |
| 467 | |
| 468 | dir = xenbus_directory(XBT_NIL, bus->root, type, &dir_n); |
Jeremy Fitzhardinge | a39bda2 | 2010-03-29 14:38:12 -0700 | [diff] [blame] | 469 | if (IS_ERR(dir)) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 470 | return PTR_ERR(dir); |
| 471 | |
| 472 | for (i = 0; i < dir_n; i++) { |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 473 | err = bus->probe(bus, type, dir[i]); |
Jeremy Fitzhardinge | a39bda2 | 2010-03-29 14:38:12 -0700 | [diff] [blame] | 474 | if (err) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 475 | break; |
| 476 | } |
Jeremy Fitzhardinge | a39bda2 | 2010-03-29 14:38:12 -0700 | [diff] [blame] | 477 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 478 | kfree(dir); |
| 479 | return err; |
| 480 | } |
| 481 | |
| 482 | int xenbus_probe_devices(struct xen_bus_type *bus) |
| 483 | { |
| 484 | int err = 0; |
| 485 | char **dir; |
| 486 | unsigned int i, dir_n; |
| 487 | |
| 488 | dir = xenbus_directory(XBT_NIL, bus->root, "", &dir_n); |
Jeremy Fitzhardinge | a39bda2 | 2010-03-29 14:38:12 -0700 | [diff] [blame] | 489 | if (IS_ERR(dir)) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 490 | return PTR_ERR(dir); |
| 491 | |
| 492 | for (i = 0; i < dir_n; i++) { |
| 493 | err = xenbus_probe_device_type(bus, dir[i]); |
Jeremy Fitzhardinge | a39bda2 | 2010-03-29 14:38:12 -0700 | [diff] [blame] | 494 | if (err) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 495 | break; |
| 496 | } |
Jeremy Fitzhardinge | a39bda2 | 2010-03-29 14:38:12 -0700 | [diff] [blame] | 497 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 498 | kfree(dir); |
| 499 | return err; |
| 500 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 501 | EXPORT_SYMBOL_GPL(xenbus_probe_devices); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 502 | |
| 503 | static unsigned int char_count(const char *str, char c) |
| 504 | { |
| 505 | unsigned int i, ret = 0; |
| 506 | |
| 507 | for (i = 0; str[i]; i++) |
| 508 | if (str[i] == c) |
| 509 | ret++; |
| 510 | return ret; |
| 511 | } |
| 512 | |
| 513 | static int strsep_len(const char *str, char c, unsigned int len) |
| 514 | { |
| 515 | unsigned int i; |
| 516 | |
| 517 | for (i = 0; str[i]; i++) |
| 518 | if (str[i] == c) { |
| 519 | if (len == 0) |
| 520 | return i; |
| 521 | len--; |
| 522 | } |
| 523 | return (len == 0) ? i : -ERANGE; |
| 524 | } |
| 525 | |
| 526 | void xenbus_dev_changed(const char *node, struct xen_bus_type *bus) |
| 527 | { |
| 528 | int exists, rootlen; |
| 529 | struct xenbus_device *dev; |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 530 | char type[XEN_BUS_ID_SIZE]; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 531 | const char *p, *root; |
| 532 | |
| 533 | if (char_count(node, '/') < 2) |
| 534 | return; |
| 535 | |
| 536 | exists = xenbus_exists(XBT_NIL, node, ""); |
| 537 | if (!exists) { |
| 538 | xenbus_cleanup_devices(node, &bus->bus); |
| 539 | return; |
| 540 | } |
| 541 | |
| 542 | /* backend/<type>/... or device/<type>/... */ |
| 543 | p = strchr(node, '/') + 1; |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 544 | snprintf(type, XEN_BUS_ID_SIZE, "%.*s", (int)strcspn(p, "/"), p); |
| 545 | type[XEN_BUS_ID_SIZE-1] = '\0'; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 546 | |
| 547 | rootlen = strsep_len(node, '/', bus->levels); |
| 548 | if (rootlen < 0) |
| 549 | return; |
| 550 | root = kasprintf(GFP_KERNEL, "%.*s", rootlen, node); |
| 551 | if (!root) |
| 552 | return; |
| 553 | |
| 554 | dev = xenbus_device_find(root, &bus->bus); |
| 555 | if (!dev) |
| 556 | xenbus_probe_node(bus, type, root); |
| 557 | else |
| 558 | put_device(&dev->dev); |
| 559 | |
| 560 | kfree(root); |
| 561 | } |
Jeremy Fitzhardinge | c6a960c | 2009-02-09 12:05:53 -0800 | [diff] [blame] | 562 | EXPORT_SYMBOL_GPL(xenbus_dev_changed); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 563 | |
Kazuhiro SUZUKI | c7853ae | 2011-02-18 14:43:07 -0800 | [diff] [blame] | 564 | int xenbus_dev_suspend(struct device *dev) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 565 | { |
| 566 | int err = 0; |
| 567 | struct xenbus_driver *drv; |
Ian Campbell | 6bac7f9 | 2010-12-10 14:39:15 +0000 | [diff] [blame] | 568 | struct xenbus_device *xdev |
| 569 | = container_of(dev, struct xenbus_device, dev); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 570 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 571 | DPRINTK("%s", xdev->nodename); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 572 | |
| 573 | if (dev->driver == NULL) |
| 574 | return 0; |
| 575 | drv = to_xenbus_driver(dev->driver); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 576 | if (drv->suspend) |
Kazuhiro SUZUKI | c7853ae | 2011-02-18 14:43:07 -0800 | [diff] [blame] | 577 | err = drv->suspend(xdev); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 578 | if (err) |
| 579 | printk(KERN_WARNING |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 580 | "xenbus: suspend %s failed: %i\n", dev_name(dev), err); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 581 | return 0; |
| 582 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 583 | EXPORT_SYMBOL_GPL(xenbus_dev_suspend); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 584 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 585 | int xenbus_dev_resume(struct device *dev) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 586 | { |
| 587 | int err; |
| 588 | struct xenbus_driver *drv; |
Ian Campbell | 6bac7f9 | 2010-12-10 14:39:15 +0000 | [diff] [blame] | 589 | struct xenbus_device *xdev |
| 590 | = container_of(dev, struct xenbus_device, dev); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 591 | |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 592 | DPRINTK("%s", xdev->nodename); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 593 | |
| 594 | if (dev->driver == NULL) |
| 595 | return 0; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 596 | drv = to_xenbus_driver(dev->driver); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 597 | err = talk_to_otherend(xdev); |
| 598 | if (err) { |
| 599 | printk(KERN_WARNING |
| 600 | "xenbus: resume (talk_to_otherend) %s failed: %i\n", |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 601 | dev_name(dev), err); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 602 | return err; |
| 603 | } |
| 604 | |
| 605 | xdev->state = XenbusStateInitialising; |
| 606 | |
| 607 | if (drv->resume) { |
| 608 | err = drv->resume(xdev); |
| 609 | if (err) { |
| 610 | printk(KERN_WARNING |
| 611 | "xenbus: resume %s failed: %i\n", |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 612 | dev_name(dev), err); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 613 | return err; |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | err = watch_otherend(xdev); |
| 618 | if (err) { |
| 619 | printk(KERN_WARNING |
| 620 | "xenbus_probe: resume (watch_otherend) %s failed: " |
Kay Sievers | 2a678cc | 2009-01-06 10:44:34 -0800 | [diff] [blame] | 621 | "%d.\n", dev_name(dev), err); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 622 | return err; |
| 623 | } |
| 624 | |
| 625 | return 0; |
| 626 | } |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 627 | EXPORT_SYMBOL_GPL(xenbus_dev_resume); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 628 | |
Kazuhiro SUZUKI | c7853ae | 2011-02-18 14:43:07 -0800 | [diff] [blame] | 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 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 637 | /* A flag to determine if xenstored is 'ready' (i.e. has started) */ |
Ruslan Pisarev | 6913200 | 2011-07-26 14:17:23 +0300 | [diff] [blame] | 638 | int xenstored_ready; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 639 | |
| 640 | |
| 641 | int register_xenstore_notifier(struct notifier_block *nb) |
| 642 | { |
| 643 | int ret = 0; |
| 644 | |
Stefano Stabellini | a947f0f | 2010-10-04 16:10:06 +0100 | [diff] [blame] | 645 | if (xenstored_ready > 0) |
| 646 | ret = nb->notifier_call(nb, 0, NULL); |
| 647 | else |
| 648 | blocking_notifier_chain_register(&xenstore_chain, nb); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 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 | { |
Stefano Stabellini | a947f0f | 2010-10-04 16:10:06 +0100 | [diff] [blame] | 662 | xenstored_ready = 1; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 663 | |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 664 | /* Notify others that xenstore is up */ |
| 665 | blocking_notifier_call_chain(&xenstore_chain, 0, NULL); |
| 666 | } |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 667 | EXPORT_SYMBOL_GPL(xenbus_probe); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 668 | |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 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 | |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 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) |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 687 | { |
| 688 | int err = 0; |
Juan Quintela | b37a56d | 2010-09-02 14:53:56 +0100 | [diff] [blame] | 689 | unsigned long page = 0; |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 690 | struct evtchn_alloc_unbound alloc_unbound; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 691 | |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 692 | /* Allocate Xenstore page */ |
| 693 | page = get_zeroed_page(GFP_KERNEL); |
| 694 | if (!page) |
| 695 | goto out_err; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 696 | |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 697 | xen_store_mfn = xen_start_info->store_mfn = |
| 698 | pfn_to_mfn(virt_to_phys((void *)page) >> |
| 699 | PAGE_SHIFT); |
| 700 | |
| 701 | /* Next allocate a local port which xenstored can bind to */ |
| 702 | alloc_unbound.dom = DOMID_SELF; |
| 703 | alloc_unbound.remote_dom = DOMID_SELF; |
| 704 | |
| 705 | err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, |
| 706 | &alloc_unbound); |
| 707 | if (err == -ENOSYS) |
| 708 | goto out_err; |
| 709 | |
| 710 | BUG_ON(err); |
| 711 | xen_store_evtchn = xen_start_info->store_evtchn = |
| 712 | alloc_unbound.port; |
| 713 | |
| 714 | return 0; |
| 715 | |
| 716 | out_err: |
| 717 | if (page != 0) |
| 718 | free_page(page); |
| 719 | return err; |
| 720 | } |
| 721 | |
Stefano Stabellini | ecc635f | 2012-09-14 12:13:12 +0100 | [diff] [blame] | 722 | enum xenstore_init { |
| 723 | UNKNOWN, |
| 724 | PV, |
| 725 | HVM, |
| 726 | LOCAL, |
| 727 | }; |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 728 | static int __init xenbus_init(void) |
| 729 | { |
| 730 | int err = 0; |
Stefano Stabellini | ecc635f | 2012-09-14 12:13:12 +0100 | [diff] [blame] | 731 | enum xenstore_init usage = UNKNOWN; |
| 732 | uint64_t v = 0; |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 733 | |
Jeremy Fitzhardinge | 6e83358 | 2008-08-19 13:16:17 -0700 | [diff] [blame] | 734 | if (!xen_domain()) |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 735 | return -ENODEV; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 736 | |
Daniel De Graaf | 2c5d37d | 2011-12-19 14:55:14 -0500 | [diff] [blame] | 737 | xenbus_ring_ops_init(); |
| 738 | |
Stefano Stabellini | ecc635f | 2012-09-14 12:13:12 +0100 | [diff] [blame] | 739 | if (xen_pv_domain()) |
| 740 | usage = PV; |
| 741 | if (xen_hvm_domain()) |
| 742 | usage = HVM; |
| 743 | if (xen_hvm_domain() && xen_initial_domain()) |
| 744 | usage = LOCAL; |
| 745 | if (xen_pv_domain() && !xen_start_info->store_evtchn) |
| 746 | usage = LOCAL; |
| 747 | if (xen_pv_domain() && xen_start_info->store_evtchn) |
| 748 | xenstored_ready = 1; |
| 749 | |
| 750 | switch (usage) { |
| 751 | case LOCAL: |
| 752 | err = xenstored_local_init(); |
| 753 | if (err) |
| 754 | goto out_error; |
| 755 | xen_store_interface = mfn_to_virt(xen_store_mfn); |
| 756 | break; |
| 757 | case PV: |
| 758 | xen_store_evtchn = xen_start_info->store_evtchn; |
| 759 | xen_store_mfn = xen_start_info->store_mfn; |
| 760 | xen_store_interface = mfn_to_virt(xen_store_mfn); |
| 761 | break; |
| 762 | case HVM: |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 763 | err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); |
| 764 | if (err) |
Juan Quintela | b37a56d | 2010-09-02 14:53:56 +0100 | [diff] [blame] | 765 | goto out_error; |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 766 | xen_store_evtchn = (int)v; |
| 767 | err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v); |
| 768 | if (err) |
Juan Quintela | b37a56d | 2010-09-02 14:53:56 +0100 | [diff] [blame] | 769 | goto out_error; |
Daniel De Graaf | e4184aa | 2011-10-13 16:07:08 -0400 | [diff] [blame] | 770 | xen_store_mfn = (unsigned long)v; |
Stefano Stabellini | ecc635f | 2012-09-14 12:13:12 +0100 | [diff] [blame] | 771 | xen_store_interface = |
Stefano Stabellini | 3216dce | 2013-02-19 13:59:19 +0000 | [diff] [blame] | 772 | xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE); |
Stefano Stabellini | ecc635f | 2012-09-14 12:13:12 +0100 | [diff] [blame] | 773 | break; |
| 774 | default: |
| 775 | pr_warn("Xenstore state unknown\n"); |
| 776 | break; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 777 | } |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 778 | |
| 779 | /* Initialize the interface to xenstore. */ |
| 780 | err = xs_init(); |
| 781 | if (err) { |
| 782 | printk(KERN_WARNING |
| 783 | "XENBUS: Error initializing xenstore comms: %i\n", err); |
Ian Campbell | 2de06cc | 2009-02-09 12:05:51 -0800 | [diff] [blame] | 784 | goto out_error; |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 785 | } |
| 786 | |
Alex Zeffertt | 1107ba8 | 2009-01-07 18:07:11 -0800 | [diff] [blame] | 787 | #ifdef CONFIG_XEN_COMPAT_XENFS |
| 788 | /* |
| 789 | * Create xenfs mountpoint in /proc for compatibility with |
| 790 | * utilities that expect to find "xenbus" under "/proc/xen". |
| 791 | */ |
| 792 | proc_mkdir("xen", NULL); |
| 793 | #endif |
| 794 | |
Ruslan Pisarev | 6913200 | 2011-07-26 14:17:23 +0300 | [diff] [blame] | 795 | out_error: |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 796 | return err; |
| 797 | } |
| 798 | |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 799 | postcore_initcall(xenbus_init); |
Jeremy Fitzhardinge | 4bac07c | 2007-07-17 18:37:06 -0700 | [diff] [blame] | 800 | |
| 801 | MODULE_LICENSE("GPL"); |