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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) | |
827b3f6a | 3 | * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
4 | * Licensed under the GPL |
5 | */ | |
6 | ||
827b3f6a JD |
7 | #include <linux/console.h> |
8 | #include <linux/ctype.h> | |
e7d2860b | 9 | #include <linux/string.h> |
827b3f6a JD |
10 | #include <linux/interrupt.h> |
11 | #include <linux/list.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/notifier.h> | |
15 | #include <linux/reboot.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/syscalls.h> | |
19 | #include <linux/utsname.h> | |
36137120 BS |
20 | #include <linux/socket.h> |
21 | #include <linux/un.h> | |
827b3f6a JD |
22 | #include <linux/workqueue.h> |
23 | #include <linux/mutex.h> | |
24 | #include <asm/uaccess.h> | |
a3a85a76 | 25 | #include <asm/switch_to.h> |
827b3f6a | 26 | |
ae2587e4 JD |
27 | #include "init.h" |
28 | #include "irq_kern.h" | |
29 | #include "irq_user.h" | |
1da177e4 | 30 | #include "kern_util.h" |
1da177e4 LT |
31 | #include "mconsole.h" |
32 | #include "mconsole_kern.h" | |
1da177e4 | 33 | #include "os.h" |
1da177e4 | 34 | |
d50084a2 | 35 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
36 | unsigned long what, void *data) |
37 | { | |
ae2587e4 | 38 | return mconsole_unlink_socket(); |
1da177e4 LT |
39 | } |
40 | ||
41 | ||
42 | static struct notifier_block reboot_notifier = { | |
43 | .notifier_call = do_unlink_socket, | |
44 | .priority = 0, | |
45 | }; | |
46 | ||
d50084a2 | 47 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
48 | * locking, and the interrupt handler is safe because it can't interrupt |
49 | * itself and it can only happen on CPU 0. | |
50 | */ | |
51 | ||
9010772c | 52 | static LIST_HEAD(mc_requests); |
1da177e4 | 53 | |
6d5aefb8 | 54 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
55 | { |
56 | struct mconsole_entry *req; | |
57 | unsigned long flags; | |
58 | ||
ae2587e4 | 59 | while (!list_empty(&mc_requests)) { |
dbdb4c06 | 60 | local_irq_save(flags); |
ae2587e4 | 61 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
1da177e4 LT |
62 | list_del(&req->list); |
63 | local_irq_restore(flags); | |
64 | req->request.cmd->handler(&req->request); | |
65 | kfree(req); | |
66 | } | |
67 | } | |
68 | ||
6d5aefb8 | 69 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 70 | |
7bea96fd | 71 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
72 | { |
73 | /* long to avoid size mismatch warnings from gcc */ | |
74 | long fd; | |
75 | struct mconsole_entry *new; | |
3a51237d | 76 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
77 | |
78 | fd = (long) dev_id; | |
ae2587e4 JD |
79 | while (mconsole_get_request(fd, &req)) { |
80 | if (req.cmd->context == MCONSOLE_INTR) | |
1da177e4 LT |
81 | (*req.cmd->handler)(&req); |
82 | else { | |
60baa158 | 83 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
ae2587e4 | 84 | if (new == NULL) |
1da177e4 LT |
85 | mconsole_reply(&req, "Out of memory", 1, 0); |
86 | else { | |
87 | new->request = req; | |
3a51237d | 88 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
89 | list_add(&new->list, &mc_requests); |
90 | } | |
91 | } | |
92 | } | |
ae2587e4 | 93 | if (!list_empty(&mc_requests)) |
1da177e4 LT |
94 | schedule_work(&mconsole_work); |
95 | reactivate_fd(fd, MCONSOLE_IRQ); | |
ae2587e4 | 96 | return IRQ_HANDLED; |
1da177e4 LT |
97 | } |
98 | ||
99 | void mconsole_version(struct mc_request *req) | |
100 | { | |
101 | char version[256]; | |
102 | ||
e9ff3990 | 103 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
ae2587e4 JD |
104 | utsname()->nodename, utsname()->release, utsname()->version, |
105 | utsname()->machine); | |
1da177e4 LT |
106 | mconsole_reply(req, version, 0, 0); |
107 | } | |
108 | ||
109 | void mconsole_log(struct mc_request *req) | |
110 | { | |
111 | int len; | |
112 | char *ptr = req->request.data; | |
113 | ||
114 | ptr += strlen("log "); | |
115 | ||
116 | len = req->len - (ptr - req->request.data); | |
ae2587e4 | 117 | printk(KERN_WARNING "%.*s", len, ptr); |
1da177e4 LT |
118 | mconsole_reply(req, "", 0, 0); |
119 | } | |
120 | ||
121 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
122 | * problems; however, we need it fixed, because it is expected that UML users | |
123 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
124 | * show the real procfs content, not the ones from hppfs.*/ | |
125 | #if 0 | |
126 | void mconsole_proc(struct mc_request *req) | |
127 | { | |
4ecf09fd | 128 | struct vfsmount *mnt = current->nsproxy->pid_ns->proc_mnt; |
1da177e4 | 129 | struct file *file; |
73d049a4 | 130 | int n; |
1da177e4 | 131 | char *ptr = req->request.data, *buf; |
4ecf09fd | 132 | mm_segment_t old_fs = get_fs(); |
1da177e4 LT |
133 | |
134 | ptr += strlen("proc"); | |
e7d2860b | 135 | ptr = skip_spaces(ptr); |
1da177e4 | 136 | |
73d049a4 | 137 | file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY); |
ae2587e4 | 138 | if (IS_ERR(file)) { |
1da177e4 | 139 | mconsole_reply(req, "Failed to open file", 1, 0); |
4ecf09fd | 140 | goto out; |
1da177e4 | 141 | } |
1da177e4 LT |
142 | |
143 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 144 | if (buf == NULL) { |
1da177e4 LT |
145 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
146 | goto out_fput; | |
147 | } | |
148 | ||
4ecf09fd | 149 | if (file->f_op->read) { |
1da177e4 | 150 | do { |
4ecf09fd AV |
151 | loff_t pos; |
152 | set_fs(KERNEL_DS); | |
153 | n = vfs_read(file, buf, PAGE_SIZE - 1, &pos); | |
154 | file_pos_write(file, pos); | |
155 | set_fs(old_fs); | |
ae2587e4 | 156 | if (n >= 0) { |
1da177e4 LT |
157 | buf[n] = '\0'; |
158 | mconsole_reply(req, buf, 0, (n > 0)); | |
159 | } | |
160 | else { | |
161 | mconsole_reply(req, "Read of file failed", | |
162 | 1, 0); | |
163 | goto out_free; | |
164 | } | |
ae2587e4 | 165 | } while (n > 0); |
1da177e4 LT |
166 | } |
167 | else mconsole_reply(req, "", 0, 0); | |
168 | ||
169 | out_free: | |
170 | kfree(buf); | |
171 | out_fput: | |
172 | fput(file); | |
1da177e4 LT |
173 | out: ; |
174 | } | |
175 | #endif | |
176 | ||
177 | void mconsole_proc(struct mc_request *req) | |
178 | { | |
179 | char path[64]; | |
180 | char *buf; | |
181 | int len; | |
182 | int fd; | |
183 | int first_chunk = 1; | |
184 | char *ptr = req->request.data; | |
185 | ||
186 | ptr += strlen("proc"); | |
e7d2860b | 187 | ptr = skip_spaces(ptr); |
1da177e4 LT |
188 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
189 | ||
190 | fd = sys_open(path, 0, 0); | |
191 | if (fd < 0) { | |
192 | mconsole_reply(req, "Failed to open file", 1, 0); | |
ae2587e4 | 193 | printk(KERN_ERR "open %s: %d\n",path,fd); |
1da177e4 LT |
194 | goto out; |
195 | } | |
196 | ||
197 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 198 | if (buf == NULL) { |
1da177e4 LT |
199 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
200 | goto out_close; | |
201 | } | |
202 | ||
203 | for (;;) { | |
204 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
205 | if (len < 0) { | |
206 | mconsole_reply(req, "Read of file failed", 1, 0); | |
207 | goto out_free; | |
208 | } | |
ae2587e4 | 209 | /* Begin the file content on his own line. */ |
1da177e4 LT |
210 | if (first_chunk) { |
211 | mconsole_reply(req, "\n", 0, 1); | |
212 | first_chunk = 0; | |
213 | } | |
214 | if (len == PAGE_SIZE-1) { | |
215 | buf[len] = '\0'; | |
216 | mconsole_reply(req, buf, 0, 1); | |
217 | } else { | |
218 | buf[len] = '\0'; | |
219 | mconsole_reply(req, buf, 0, 0); | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | out_free: | |
225 | kfree(buf); | |
226 | out_close: | |
227 | sys_close(fd); | |
228 | out: | |
229 | /* nothing */; | |
230 | } | |
231 | ||
232 | #define UML_MCONSOLE_HELPTEXT \ | |
233 | "Commands: \n\ | |
234 | version - Get kernel version \n\ | |
235 | help - Print this message \n\ | |
236 | halt - Halt UML \n\ | |
237 | reboot - Reboot UML \n\ | |
238 | config <dev>=<config> - Add a new device to UML; \n\ | |
239 | same syntax as command line \n\ | |
240 | config <dev> - Query the configuration of a device \n\ | |
241 | remove <dev> - Remove a device from UML \n\ | |
242 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 243 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
244 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
245 | go - continue the UML after a 'stop' \n\ | |
246 | log <string> - make UML enter <string> into the kernel log\n\ | |
247 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 248 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
249 | " |
250 | ||
251 | void mconsole_help(struct mc_request *req) | |
252 | { | |
253 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
254 | } | |
255 | ||
256 | void mconsole_halt(struct mc_request *req) | |
257 | { | |
258 | mconsole_reply(req, "", 0, 0); | |
259 | machine_halt(); | |
260 | } | |
261 | ||
262 | void mconsole_reboot(struct mc_request *req) | |
263 | { | |
264 | mconsole_reply(req, "", 0, 0); | |
265 | machine_restart(NULL); | |
266 | } | |
267 | ||
1da177e4 LT |
268 | void mconsole_cad(struct mc_request *req) |
269 | { | |
270 | mconsole_reply(req, "", 0, 0); | |
271 | ctrl_alt_del(); | |
272 | } | |
273 | ||
274 | void mconsole_go(struct mc_request *req) | |
275 | { | |
276 | mconsole_reply(req, "Not stopped", 1, 0); | |
277 | } | |
278 | ||
279 | void mconsole_stop(struct mc_request *req) | |
280 | { | |
281 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
282 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d | 283 | mconsole_reply(req, "stopped", 0, 0); |
cc0be0fb KS |
284 | for (;;) { |
285 | if (!mconsole_get_request(req->originating_fd, req)) | |
286 | continue; | |
3a51237d AV |
287 | if (req->cmd->handler == mconsole_go) |
288 | break; | |
289 | if (req->cmd->handler == mconsole_stop) { | |
290 | mconsole_reply(req, "Already stopped", 1, 0); | |
291 | continue; | |
292 | } | |
293 | if (req->cmd->handler == mconsole_sysrq) { | |
294 | struct pt_regs *old_regs; | |
295 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
296 | mconsole_sysrq(req); | |
297 | set_irq_regs(old_regs); | |
298 | continue; | |
299 | } | |
1da177e4 LT |
300 | (*req->cmd->handler)(req); |
301 | } | |
302 | os_set_fd_block(req->originating_fd, 0); | |
303 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
304 | mconsole_reply(req, "", 0, 0); | |
305 | } | |
306 | ||
84f48d4f | 307 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 308 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
309 | |
310 | void mconsole_register_dev(struct mc_device *new) | |
311 | { | |
84f48d4f JD |
312 | spin_lock(&mc_devices_lock); |
313 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 314 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 315 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
316 | } |
317 | ||
318 | static struct mc_device *mconsole_find_dev(char *name) | |
319 | { | |
320 | struct list_head *ele; | |
321 | struct mc_device *dev; | |
322 | ||
ae2587e4 | 323 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 324 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
325 | if (!strncmp(name, dev->name, strlen(dev->name))) |
326 | return dev; | |
1da177e4 | 327 | } |
ae2587e4 | 328 | return NULL; |
1da177e4 LT |
329 | } |
330 | ||
02dea087 JD |
331 | #define UNPLUGGED_PER_PAGE \ |
332 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
333 | ||
334 | struct unplugged_pages { | |
335 | struct list_head list; | |
336 | void *pages[UNPLUGGED_PER_PAGE]; | |
337 | }; | |
338 | ||
e98fa281 | 339 | static DEFINE_MUTEX(plug_mem_mutex); |
02dea087 | 340 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 341 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
342 | static int unplug_index = UNPLUGGED_PER_PAGE; |
343 | ||
f28169d2 | 344 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
345 | { |
346 | unsigned long long diff; | |
347 | int err = -EINVAL, i, add; | |
348 | char *ret; | |
349 | ||
ae2587e4 | 350 | if (str[0] != '=') { |
f28169d2 | 351 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 352 | goto out; |
f28169d2 | 353 | } |
02dea087 JD |
354 | |
355 | str++; | |
ae2587e4 | 356 | if (str[0] == '-') |
02dea087 | 357 | add = 0; |
ae2587e4 | 358 | else if (str[0] == '+') { |
02dea087 JD |
359 | add = 1; |
360 | } | |
f28169d2 JD |
361 | else { |
362 | *error_out = "Expected increment to start with '-' or '+'"; | |
363 | goto out; | |
364 | } | |
02dea087 JD |
365 | |
366 | str++; | |
367 | diff = memparse(str, &ret); | |
ae2587e4 | 368 | if (*ret != '\0') { |
f28169d2 | 369 | *error_out = "Failed to parse memory increment"; |
02dea087 | 370 | goto out; |
f28169d2 | 371 | } |
02dea087 JD |
372 | |
373 | diff /= PAGE_SIZE; | |
374 | ||
e98fa281 | 375 | mutex_lock(&plug_mem_mutex); |
ae2587e4 | 376 | for (i = 0; i < diff; i++) { |
02dea087 JD |
377 | struct unplugged_pages *unplugged; |
378 | void *addr; | |
379 | ||
ae2587e4 JD |
380 | if (add) { |
381 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
382 | break; |
383 | ||
384 | unplugged = list_entry(unplugged_pages.next, | |
385 | struct unplugged_pages, list); | |
ae2587e4 | 386 | if (unplug_index > 0) |
02dea087 JD |
387 | addr = unplugged->pages[--unplug_index]; |
388 | else { | |
389 | list_del(&unplugged->list); | |
390 | addr = unplugged; | |
391 | unplug_index = UNPLUGGED_PER_PAGE; | |
392 | } | |
393 | ||
394 | free_page((unsigned long) addr); | |
395 | unplugged_pages_count--; | |
396 | } | |
397 | else { | |
398 | struct page *page; | |
399 | ||
400 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 401 | if (page == NULL) |
02dea087 JD |
402 | break; |
403 | ||
404 | unplugged = page_address(page); | |
ae2587e4 | 405 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
406 | list_add(&unplugged->list, &unplugged_pages); |
407 | unplug_index = 0; | |
408 | } | |
409 | else { | |
410 | struct list_head *entry = unplugged_pages.next; | |
411 | addr = unplugged; | |
412 | ||
413 | unplugged = list_entry(entry, | |
414 | struct unplugged_pages, | |
415 | list); | |
02dea087 | 416 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
417 | if (err) { |
418 | printk(KERN_ERR "Failed to release " | |
419 | "memory - errno = %d\n", err); | |
f28169d2 | 420 | *error_out = "Failed to release memory"; |
84f48d4f | 421 | goto out_unlock; |
f28169d2 JD |
422 | } |
423 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
424 | } |
425 | ||
426 | unplugged_pages_count++; | |
427 | } | |
428 | } | |
429 | ||
430 | err = 0; | |
84f48d4f | 431 | out_unlock: |
e98fa281 | 432 | mutex_unlock(&plug_mem_mutex); |
02dea087 JD |
433 | out: |
434 | return err; | |
435 | } | |
436 | ||
437 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
438 | { | |
439 | char buf[sizeof("18446744073709551615")]; | |
440 | int len = 0; | |
441 | ||
442 | sprintf(buf, "%ld", uml_physmem); | |
443 | CONFIG_CHUNK(str, size, len, buf, 1); | |
444 | ||
445 | return len; | |
446 | } | |
447 | ||
448 | static int mem_id(char **str, int *start_out, int *end_out) | |
449 | { | |
450 | *start_out = 0; | |
451 | *end_out = 0; | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
f28169d2 | 456 | static int mem_remove(int n, char **error_out) |
02dea087 | 457 | { |
f28169d2 | 458 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
459 | return -EBUSY; |
460 | } | |
461 | ||
462 | static struct mc_device mem_mc = { | |
84f48d4f | 463 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
464 | .name = "mem", |
465 | .config = mem_config, | |
466 | .get_config = mem_get_config, | |
467 | .id = mem_id, | |
468 | .remove = mem_remove, | |
469 | }; | |
470 | ||
97a1fcbb | 471 | static int __init mem_mc_init(void) |
02dea087 | 472 | { |
ae2587e4 | 473 | if (can_drop_memory()) |
02dea087 | 474 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
475 | else printk(KERN_ERR "Can't release memory to the host - memory " |
476 | "hotplug won't be supported\n"); | |
02dea087 JD |
477 | return 0; |
478 | } | |
479 | ||
480 | __initcall(mem_mc_init); | |
481 | ||
1da177e4 LT |
482 | #define CONFIG_BUF_SIZE 64 |
483 | ||
d50084a2 | 484 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
485 | char **), |
486 | struct mc_request *req, char *name) | |
487 | { | |
488 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
489 | int n, size; | |
490 | ||
ae2587e4 | 491 | if (get_config == NULL) { |
1da177e4 LT |
492 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
493 | return; | |
494 | } | |
495 | ||
496 | error = NULL; | |
91b165c0 | 497 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
498 | buf = default_buf; |
499 | ||
ae2587e4 | 500 | while (1) { |
1da177e4 | 501 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 502 | if (error != NULL) { |
1da177e4 LT |
503 | mconsole_reply(req, error, 1, 0); |
504 | goto out; | |
505 | } | |
506 | ||
ae2587e4 | 507 | if (n <= size) { |
1da177e4 LT |
508 | mconsole_reply(req, buf, 0, 0); |
509 | goto out; | |
510 | } | |
511 | ||
ae2587e4 | 512 | if (buf != default_buf) |
1da177e4 LT |
513 | kfree(buf); |
514 | ||
515 | size = n; | |
516 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 517 | if (buf == NULL) { |
1da177e4 LT |
518 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
519 | return; | |
520 | } | |
521 | } | |
522 | out: | |
ae2587e4 | 523 | if (buf != default_buf) |
1da177e4 | 524 | kfree(buf); |
1da177e4 LT |
525 | } |
526 | ||
527 | void mconsole_config(struct mc_request *req) | |
528 | { | |
529 | struct mc_device *dev; | |
f28169d2 | 530 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
531 | int err; |
532 | ||
533 | ptr += strlen("config"); | |
e7d2860b | 534 | ptr = skip_spaces(ptr); |
1da177e4 | 535 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 536 | if (dev == NULL) { |
1da177e4 LT |
537 | mconsole_reply(req, "Bad configuration option", 1, 0); |
538 | return; | |
539 | } | |
540 | ||
541 | name = &ptr[strlen(dev->name)]; | |
542 | ptr = name; | |
ae2587e4 | 543 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
544 | ptr++; |
545 | ||
ae2587e4 | 546 | if (*ptr == '=') { |
f28169d2 JD |
547 | err = (*dev->config)(name, &error_string); |
548 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
549 | } |
550 | else mconsole_get_config(dev->get_config, req, name); | |
551 | } | |
552 | ||
553 | void mconsole_remove(struct mc_request *req) | |
554 | { | |
d50084a2 | 555 | struct mc_device *dev; |
29d56cfe | 556 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 557 | char error[256]; |
29d56cfe | 558 | int err, start, end, n; |
1da177e4 LT |
559 | |
560 | ptr += strlen("remove"); | |
e7d2860b | 561 | ptr = skip_spaces(ptr); |
1da177e4 | 562 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 563 | if (dev == NULL) { |
1da177e4 LT |
564 | mconsole_reply(req, "Bad remove option", 1, 0); |
565 | return; | |
566 | } | |
29d56cfe | 567 | |
3a331a51 JD |
568 | ptr = &ptr[strlen(dev->name)]; |
569 | ||
570 | err = 1; | |
571 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 572 | if (n < 0) { |
3a331a51 JD |
573 | err_msg = "Couldn't parse device number"; |
574 | goto out; | |
575 | } | |
ae2587e4 | 576 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
577 | sprintf(error, "Invalid device number - must be between " |
578 | "%d and %d", start, end); | |
579 | err_msg = error; | |
580 | goto out; | |
581 | } | |
29d56cfe | 582 | |
f28169d2 JD |
583 | err_msg = NULL; |
584 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 585 | switch(err) { |
d40f6d71 JD |
586 | case 0: |
587 | err_msg = ""; | |
588 | break; | |
3a331a51 | 589 | case -ENODEV: |
ae2587e4 | 590 | if (err_msg == NULL) |
f28169d2 | 591 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
592 | break; |
593 | case -EBUSY: | |
ae2587e4 | 594 | if (err_msg == NULL) |
f28169d2 | 595 | err_msg = "Device is currently open"; |
3a331a51 JD |
596 | break; |
597 | default: | |
598 | break; | |
599 | } | |
600 | out: | |
29d56cfe | 601 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
602 | } |
603 | ||
f92afe56 JD |
604 | struct mconsole_output { |
605 | struct list_head list; | |
606 | struct mc_request *req; | |
607 | }; | |
608 | ||
84f48d4f | 609 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
610 | static LIST_HEAD(clients); |
611 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
612 | |
613 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 614 | unsigned int len) |
6f517d3f JD |
615 | { |
616 | struct list_head *ele; | |
617 | int n; | |
618 | ||
ae2587e4 | 619 | if (list_empty(&clients)) |
6f517d3f JD |
620 | return; |
621 | ||
54fa0ba4 JD |
622 | while (len > 0) { |
623 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
624 | strncpy(console_buf, string, n); | |
6f517d3f JD |
625 | string += n; |
626 | len -= n; | |
6f517d3f | 627 | |
ae2587e4 | 628 | list_for_each(ele, &clients) { |
f92afe56 | 629 | struct mconsole_output *entry; |
6f517d3f | 630 | |
f92afe56 | 631 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 632 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 633 | } |
6f517d3f JD |
634 | } |
635 | } | |
636 | ||
637 | static struct console mc_console = { .name = "mc", | |
638 | .write = console_write, | |
a174b30e | 639 | .flags = CON_ENABLED, |
6f517d3f JD |
640 | .index = -1 }; |
641 | ||
642 | static int mc_add_console(void) | |
643 | { | |
644 | register_console(&mc_console); | |
645 | return 0; | |
646 | } | |
647 | ||
648 | late_initcall(mc_add_console); | |
649 | ||
650 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
651 | void *arg) | |
652 | { | |
f92afe56 | 653 | struct mconsole_output entry; |
6f517d3f JD |
654 | unsigned long flags; |
655 | ||
f92afe56 | 656 | entry.req = req; |
84f48d4f | 657 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 658 | list_add(&entry.list, &clients); |
84f48d4f | 659 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
660 | |
661 | (*proc)(arg); | |
662 | ||
54fa0ba4 | 663 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 664 | |
84f48d4f | 665 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 666 | list_del(&entry.list); |
84f48d4f | 667 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
668 | } |
669 | ||
4111b025 | 670 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
671 | |
672 | #include <linux/sysrq.h> | |
673 | ||
4111b025 JD |
674 | static void sysrq_proc(void *arg) |
675 | { | |
676 | char *op = arg; | |
f335397d | 677 | handle_sysrq(*op); |
4111b025 JD |
678 | } |
679 | ||
680 | void mconsole_sysrq(struct mc_request *req) | |
681 | { | |
682 | char *ptr = req->request.data; | |
683 | ||
684 | ptr += strlen("sysrq"); | |
e7d2860b | 685 | ptr = skip_spaces(ptr); |
4111b025 | 686 | |
ae2587e4 JD |
687 | /* |
688 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
689 | * so in this case, we reply first. |
690 | */ | |
ae2587e4 | 691 | if (*ptr == 'b') |
4111b025 JD |
692 | mconsole_reply(req, "", 0, 0); |
693 | ||
694 | with_console(req, sysrq_proc, ptr); | |
695 | } | |
696 | #else | |
697 | void mconsole_sysrq(struct mc_request *req) | |
698 | { | |
699 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
700 | } | |
701 | #endif | |
702 | ||
6f517d3f JD |
703 | static void stack_proc(void *arg) |
704 | { | |
705 | struct task_struct *from = current, *to = arg; | |
706 | ||
707 | to->thread.saved_task = from; | |
708 | switch_to(from, to, from); | |
709 | } | |
710 | ||
ae2587e4 JD |
711 | /* |
712 | * Mconsole stack trace | |
3eddddcf JD |
713 | * Added by Allan Graves, Jeff Dike |
714 | * Dumps a stacks registers to the linux console. | |
715 | * Usage stack <pid>. | |
716 | */ | |
42fda663 | 717 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 718 | { |
3a331a51 JD |
719 | char *ptr = req->request.data; |
720 | int pid_requested= -1; | |
3eddddcf JD |
721 | struct task_struct *to = NULL; |
722 | ||
ae2587e4 JD |
723 | /* |
724 | * Would be nice: | |
3a331a51 | 725 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
726 | * 2) Add a way to stack dump all pids. |
727 | */ | |
728 | ||
3a331a51 | 729 | ptr += strlen("stack"); |
e7d2860b | 730 | ptr = skip_spaces(ptr); |
3eddddcf | 731 | |
ae2587e4 JD |
732 | /* |
733 | * Should really check for multiple pids or reject bad args here | |
734 | */ | |
3a331a51 | 735 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 736 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
737 | mconsole_reply(req, "Please specify a pid", 1, 0); |
738 | return; | |
739 | } | |
3eddddcf | 740 | |
827b3f6a | 741 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
ae2587e4 | 742 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
743 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
744 | return; | |
745 | } | |
6f517d3f | 746 | with_console(req, stack_proc, to); |
3eddddcf | 747 | } |
3eddddcf | 748 | |
ae2587e4 JD |
749 | /* |
750 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
751 | * active. |
752 | */ | |
d50084a2 | 753 | static char *notify_socket = NULL; |
1da177e4 | 754 | |
97a1fcbb | 755 | static int __init mconsole_init(void) |
1da177e4 LT |
756 | { |
757 | /* long to avoid size mismatch warnings from gcc */ | |
758 | long sock; | |
759 | int err; | |
36137120 | 760 | char file[UNIX_PATH_MAX]; |
1da177e4 | 761 | |
ae2587e4 JD |
762 | if (umid_file_name("mconsole", file, sizeof(file))) |
763 | return -1; | |
1da177e4 LT |
764 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
765 | ||
766 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
767 | if (sock < 0) { |
768 | printk(KERN_ERR "Failed to initialize management console\n"); | |
769 | return 1; | |
1da177e4 | 770 | } |
438ee679 JD |
771 | if (os_set_fd_block(sock, 0)) |
772 | goto out; | |
1da177e4 LT |
773 | |
774 | register_reboot_notifier(&reboot_notifier); | |
775 | ||
776 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
aab94460 | 777 | IRQF_SHARED, "mconsole", (void *)sock); |
ae2587e4 JD |
778 | if (err) { |
779 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 780 | goto out; |
1da177e4 LT |
781 | } |
782 | ||
ae2587e4 | 783 | if (notify_socket != NULL) { |
970d6e3a | 784 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 785 | if (notify_socket != NULL) |
1da177e4 | 786 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 787 | mconsole_socket_name, |
1da177e4 LT |
788 | strlen(mconsole_socket_name) + 1); |
789 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
790 | "string\n"); | |
791 | } | |
792 | ||
ae2587e4 | 793 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 794 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 795 | return 0; |
438ee679 JD |
796 | |
797 | out: | |
798 | os_close_file(sock); | |
799 | return 1; | |
1da177e4 LT |
800 | } |
801 | ||
802 | __initcall(mconsole_init); | |
803 | ||
6613c5e8 AD |
804 | static ssize_t mconsole_proc_write(struct file *file, |
805 | const char __user *buffer, size_t count, loff_t *pos) | |
1da177e4 LT |
806 | { |
807 | char *buf; | |
808 | ||
809 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
810 | if (buf == NULL) |
811 | return -ENOMEM; | |
1da177e4 | 812 | |
ae2587e4 | 813 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
814 | count = -EFAULT; |
815 | goto out; | |
816 | } | |
817 | ||
818 | buf[count] = '\0'; | |
819 | ||
820 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
821 | out: | |
822 | kfree(buf); | |
ae2587e4 | 823 | return count; |
1da177e4 LT |
824 | } |
825 | ||
6613c5e8 AD |
826 | static const struct file_operations mconsole_proc_fops = { |
827 | .owner = THIS_MODULE, | |
828 | .write = mconsole_proc_write, | |
6038f373 | 829 | .llseek = noop_llseek, |
6613c5e8 AD |
830 | }; |
831 | ||
1da177e4 LT |
832 | static int create_proc_mconsole(void) |
833 | { | |
834 | struct proc_dir_entry *ent; | |
835 | ||
ae2587e4 JD |
836 | if (notify_socket == NULL) |
837 | return 0; | |
1da177e4 | 838 | |
6613c5e8 | 839 | ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops); |
ae2587e4 JD |
840 | if (ent == NULL) { |
841 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
842 | "failed\n"); | |
843 | return 0; | |
1da177e4 | 844 | } |
ae2587e4 | 845 | return 0; |
1da177e4 LT |
846 | } |
847 | ||
848 | static DEFINE_SPINLOCK(notify_spinlock); | |
849 | ||
850 | void lock_notify(void) | |
851 | { | |
852 | spin_lock(¬ify_spinlock); | |
853 | } | |
854 | ||
855 | void unlock_notify(void) | |
856 | { | |
857 | spin_unlock(¬ify_spinlock); | |
858 | } | |
859 | ||
860 | __initcall(create_proc_mconsole); | |
861 | ||
088bec41 | 862 | #define NOTIFY "notify:" |
1da177e4 LT |
863 | |
864 | static int mconsole_setup(char *str) | |
865 | { | |
ae2587e4 | 866 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
867 | str += strlen(NOTIFY); |
868 | notify_socket = str; | |
869 | } | |
870 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 871 | return 1; |
1da177e4 LT |
872 | } |
873 | ||
088bec41 | 874 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
875 | |
876 | __uml_help(mconsole_setup, | |
877 | "mconsole=notify:<socket>\n" | |
878 | " Requests that the mconsole driver send a message to the named Unix\n" | |
879 | " socket containing the name of the mconsole socket. This also serves\n" | |
880 | " to notify outside processes when UML has booted far enough to respond\n" | |
881 | " to mconsole requests.\n\n" | |
882 | ); | |
883 | ||
884 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
885 | void *ptr) | |
886 | { | |
887 | char *message = ptr; | |
888 | ||
ae2587e4 JD |
889 | if (notify_socket == NULL) |
890 | return 0; | |
1da177e4 | 891 | |
d50084a2 | 892 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 893 | strlen(message) + 1); |
ae2587e4 | 894 | return 0; |
1da177e4 LT |
895 | } |
896 | ||
897 | static struct notifier_block panic_exit_notifier = { | |
898 | .notifier_call = notify_panic, | |
899 | .next = NULL, | |
900 | .priority = 1 | |
901 | }; | |
902 | ||
903 | static int add_notifier(void) | |
904 | { | |
e041c683 AS |
905 | atomic_notifier_chain_register(&panic_notifier_list, |
906 | &panic_exit_notifier); | |
ae2587e4 | 907 | return 0; |
1da177e4 LT |
908 | } |
909 | ||
910 | __initcall(add_notifier); | |
911 | ||
912 | char *mconsole_notify_socket(void) | |
913 | { | |
ae2587e4 | 914 | return notify_socket; |
1da177e4 LT |
915 | } |
916 | ||
917 | EXPORT_SYMBOL(mconsole_notify_socket); |