Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) | |
3 | * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com) | |
4 | * Licensed under the GPL | |
5 | */ | |
6 | ||
7 | #include "linux/kernel.h" | |
8 | #include "linux/slab.h" | |
9 | #include "linux/init.h" | |
10 | #include "linux/notifier.h" | |
11 | #include "linux/reboot.h" | |
12 | #include "linux/utsname.h" | |
13 | #include "linux/ctype.h" | |
14 | #include "linux/interrupt.h" | |
15 | #include "linux/sysrq.h" | |
16 | #include "linux/workqueue.h" | |
17 | #include "linux/module.h" | |
18 | #include "linux/file.h" | |
19 | #include "linux/fs.h" | |
20 | #include "linux/namei.h" | |
21 | #include "linux/proc_fs.h" | |
22 | #include "linux/syscalls.h" | |
02dea087 JD |
23 | #include "linux/list.h" |
24 | #include "linux/mm.h" | |
6f517d3f | 25 | #include "linux/console.h" |
1da177e4 LT |
26 | #include "asm/irq.h" |
27 | #include "asm/uaccess.h" | |
28 | #include "user_util.h" | |
29 | #include "kern_util.h" | |
30 | #include "kern.h" | |
31 | #include "mconsole.h" | |
32 | #include "mconsole_kern.h" | |
33 | #include "irq_user.h" | |
34 | #include "init.h" | |
35 | #include "os.h" | |
36 | #include "umid.h" | |
37 | #include "irq_kern.h" | |
3eddddcf | 38 | #include "choose-mode.h" |
1da177e4 | 39 | |
d50084a2 | 40 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
41 | unsigned long what, void *data) |
42 | { | |
43 | return(mconsole_unlink_socket()); | |
44 | } | |
45 | ||
46 | ||
47 | static struct notifier_block reboot_notifier = { | |
48 | .notifier_call = do_unlink_socket, | |
49 | .priority = 0, | |
50 | }; | |
51 | ||
d50084a2 | 52 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
53 | * locking, and the interrupt handler is safe because it can't interrupt |
54 | * itself and it can only happen on CPU 0. | |
55 | */ | |
56 | ||
9010772c | 57 | static LIST_HEAD(mc_requests); |
1da177e4 LT |
58 | |
59 | static void mc_work_proc(void *unused) | |
60 | { | |
61 | struct mconsole_entry *req; | |
62 | unsigned long flags; | |
63 | ||
64 | while(!list_empty(&mc_requests)){ | |
dbdb4c06 | 65 | local_irq_save(flags); |
d50084a2 | 66 | req = list_entry(mc_requests.next, struct mconsole_entry, |
1da177e4 LT |
67 | list); |
68 | list_del(&req->list); | |
69 | local_irq_restore(flags); | |
70 | req->request.cmd->handler(&req->request); | |
71 | kfree(req); | |
72 | } | |
73 | } | |
74 | ||
9010772c | 75 | static DECLARE_WORK(mconsole_work, mc_work_proc, NULL); |
1da177e4 | 76 | |
7bea96fd | 77 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
78 | { |
79 | /* long to avoid size mismatch warnings from gcc */ | |
80 | long fd; | |
81 | struct mconsole_entry *new; | |
82 | struct mc_request req; | |
83 | ||
84 | fd = (long) dev_id; | |
85 | while (mconsole_get_request(fd, &req)){ | |
86 | if(req.cmd->context == MCONSOLE_INTR) | |
87 | (*req.cmd->handler)(&req); | |
88 | else { | |
60baa158 | 89 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
1da177e4 LT |
90 | if(new == NULL) |
91 | mconsole_reply(&req, "Out of memory", 1, 0); | |
92 | else { | |
93 | new->request = req; | |
94 | list_add(&new->list, &mc_requests); | |
95 | } | |
96 | } | |
97 | } | |
98 | if(!list_empty(&mc_requests)) | |
99 | schedule_work(&mconsole_work); | |
100 | reactivate_fd(fd, MCONSOLE_IRQ); | |
101 | return(IRQ_HANDLED); | |
102 | } | |
103 | ||
104 | void mconsole_version(struct mc_request *req) | |
105 | { | |
106 | char version[256]; | |
107 | ||
e9ff3990 SH |
108 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
109 | utsname()->nodename, utsname()->release, | |
110 | utsname()->version, utsname()->machine); | |
1da177e4 LT |
111 | mconsole_reply(req, version, 0, 0); |
112 | } | |
113 | ||
114 | void mconsole_log(struct mc_request *req) | |
115 | { | |
116 | int len; | |
117 | char *ptr = req->request.data; | |
118 | ||
119 | ptr += strlen("log "); | |
120 | ||
121 | len = req->len - (ptr - req->request.data); | |
122 | printk("%.*s", len, ptr); | |
123 | mconsole_reply(req, "", 0, 0); | |
124 | } | |
125 | ||
126 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
127 | * problems; however, we need it fixed, because it is expected that UML users | |
128 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
129 | * show the real procfs content, not the ones from hppfs.*/ | |
130 | #if 0 | |
131 | void mconsole_proc(struct mc_request *req) | |
132 | { | |
133 | struct nameidata nd; | |
134 | struct file_system_type *proc; | |
135 | struct super_block *super; | |
136 | struct file *file; | |
137 | int n, err; | |
138 | char *ptr = req->request.data, *buf; | |
139 | ||
140 | ptr += strlen("proc"); | |
141 | while(isspace(*ptr)) ptr++; | |
142 | ||
143 | proc = get_fs_type("proc"); | |
144 | if(proc == NULL){ | |
145 | mconsole_reply(req, "procfs not registered", 1, 0); | |
146 | goto out; | |
147 | } | |
148 | ||
149 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
150 | put_filesystem(proc); | |
151 | if(super == NULL){ | |
152 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); | |
153 | goto out; | |
154 | } | |
155 | up_write(&super->s_umount); | |
156 | ||
157 | nd.dentry = super->s_root; | |
158 | nd.mnt = NULL; | |
159 | nd.flags = O_RDONLY + 1; | |
160 | nd.last_type = LAST_ROOT; | |
161 | ||
162 | /* START: it was experienced that the stability problems are closed | |
163 | * if commenting out these two calls + the below read cycle. To | |
164 | * make UML crash again, it was enough to readd either one.*/ | |
165 | err = link_path_walk(ptr, &nd); | |
166 | if(err){ | |
167 | mconsole_reply(req, "Failed to look up file", 1, 0); | |
168 | goto out_kill; | |
169 | } | |
170 | ||
171 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); | |
172 | if(IS_ERR(file)){ | |
173 | mconsole_reply(req, "Failed to open file", 1, 0); | |
174 | goto out_kill; | |
175 | } | |
176 | /*END*/ | |
177 | ||
178 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
179 | if(buf == NULL){ | |
180 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
181 | goto out_fput; | |
182 | } | |
183 | ||
184 | if((file->f_op != NULL) && (file->f_op->read != NULL)){ | |
185 | do { | |
186 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
187 | &file->f_pos); | |
188 | if(n >= 0){ | |
189 | buf[n] = '\0'; | |
190 | mconsole_reply(req, buf, 0, (n > 0)); | |
191 | } | |
192 | else { | |
193 | mconsole_reply(req, "Read of file failed", | |
194 | 1, 0); | |
195 | goto out_free; | |
196 | } | |
197 | } while(n > 0); | |
198 | } | |
199 | else mconsole_reply(req, "", 0, 0); | |
200 | ||
201 | out_free: | |
202 | kfree(buf); | |
203 | out_fput: | |
204 | fput(file); | |
205 | out_kill: | |
206 | deactivate_super(super); | |
207 | out: ; | |
208 | } | |
209 | #endif | |
210 | ||
211 | void mconsole_proc(struct mc_request *req) | |
212 | { | |
213 | char path[64]; | |
214 | char *buf; | |
215 | int len; | |
216 | int fd; | |
217 | int first_chunk = 1; | |
218 | char *ptr = req->request.data; | |
219 | ||
220 | ptr += strlen("proc"); | |
221 | while(isspace(*ptr)) ptr++; | |
222 | snprintf(path, sizeof(path), "/proc/%s", ptr); | |
223 | ||
224 | fd = sys_open(path, 0, 0); | |
225 | if (fd < 0) { | |
226 | mconsole_reply(req, "Failed to open file", 1, 0); | |
227 | printk("open %s: %d\n",path,fd); | |
228 | goto out; | |
229 | } | |
230 | ||
231 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
232 | if(buf == NULL){ | |
233 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
234 | goto out_close; | |
235 | } | |
236 | ||
237 | for (;;) { | |
238 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
239 | if (len < 0) { | |
240 | mconsole_reply(req, "Read of file failed", 1, 0); | |
241 | goto out_free; | |
242 | } | |
243 | /*Begin the file content on his own line.*/ | |
244 | if (first_chunk) { | |
245 | mconsole_reply(req, "\n", 0, 1); | |
246 | first_chunk = 0; | |
247 | } | |
248 | if (len == PAGE_SIZE-1) { | |
249 | buf[len] = '\0'; | |
250 | mconsole_reply(req, buf, 0, 1); | |
251 | } else { | |
252 | buf[len] = '\0'; | |
253 | mconsole_reply(req, buf, 0, 0); | |
254 | break; | |
255 | } | |
256 | } | |
257 | ||
258 | out_free: | |
259 | kfree(buf); | |
260 | out_close: | |
261 | sys_close(fd); | |
262 | out: | |
263 | /* nothing */; | |
264 | } | |
265 | ||
266 | #define UML_MCONSOLE_HELPTEXT \ | |
267 | "Commands: \n\ | |
268 | version - Get kernel version \n\ | |
269 | help - Print this message \n\ | |
270 | halt - Halt UML \n\ | |
271 | reboot - Reboot UML \n\ | |
272 | config <dev>=<config> - Add a new device to UML; \n\ | |
273 | same syntax as command line \n\ | |
274 | config <dev> - Query the configuration of a device \n\ | |
275 | remove <dev> - Remove a device from UML \n\ | |
276 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 277 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
278 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
279 | go - continue the UML after a 'stop' \n\ | |
280 | log <string> - make UML enter <string> into the kernel log\n\ | |
281 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 282 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
283 | " |
284 | ||
285 | void mconsole_help(struct mc_request *req) | |
286 | { | |
287 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
288 | } | |
289 | ||
290 | void mconsole_halt(struct mc_request *req) | |
291 | { | |
292 | mconsole_reply(req, "", 0, 0); | |
293 | machine_halt(); | |
294 | } | |
295 | ||
296 | void mconsole_reboot(struct mc_request *req) | |
297 | { | |
298 | mconsole_reply(req, "", 0, 0); | |
299 | machine_restart(NULL); | |
300 | } | |
301 | ||
1da177e4 LT |
302 | void mconsole_cad(struct mc_request *req) |
303 | { | |
304 | mconsole_reply(req, "", 0, 0); | |
305 | ctrl_alt_del(); | |
306 | } | |
307 | ||
308 | void mconsole_go(struct mc_request *req) | |
309 | { | |
310 | mconsole_reply(req, "Not stopped", 1, 0); | |
311 | } | |
312 | ||
313 | void mconsole_stop(struct mc_request *req) | |
314 | { | |
315 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
316 | os_set_fd_block(req->originating_fd, 1); | |
317 | mconsole_reply(req, "", 0, 0); | |
318 | while(mconsole_get_request(req->originating_fd, req)){ | |
319 | if(req->cmd->handler == mconsole_go) break; | |
320 | (*req->cmd->handler)(req); | |
321 | } | |
322 | os_set_fd_block(req->originating_fd, 0); | |
323 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
324 | mconsole_reply(req, "", 0, 0); | |
325 | } | |
326 | ||
327 | /* This list is populated by __initcall routines. */ | |
328 | ||
42947cb9 | 329 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
330 | |
331 | void mconsole_register_dev(struct mc_device *new) | |
332 | { | |
333 | list_add(&new->list, &mconsole_devices); | |
334 | } | |
335 | ||
336 | static struct mc_device *mconsole_find_dev(char *name) | |
337 | { | |
338 | struct list_head *ele; | |
339 | struct mc_device *dev; | |
340 | ||
341 | list_for_each(ele, &mconsole_devices){ | |
342 | dev = list_entry(ele, struct mc_device, list); | |
343 | if(!strncmp(name, dev->name, strlen(dev->name))) | |
344 | return(dev); | |
345 | } | |
346 | return(NULL); | |
347 | } | |
348 | ||
02dea087 JD |
349 | #define UNPLUGGED_PER_PAGE \ |
350 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
351 | ||
352 | struct unplugged_pages { | |
353 | struct list_head list; | |
354 | void *pages[UNPLUGGED_PER_PAGE]; | |
355 | }; | |
356 | ||
357 | static unsigned long long unplugged_pages_count = 0; | |
358 | static struct list_head unplugged_pages = LIST_HEAD_INIT(unplugged_pages); | |
359 | static int unplug_index = UNPLUGGED_PER_PAGE; | |
360 | ||
361 | static int mem_config(char *str) | |
362 | { | |
363 | unsigned long long diff; | |
364 | int err = -EINVAL, i, add; | |
365 | char *ret; | |
366 | ||
367 | if(str[0] != '=') | |
368 | goto out; | |
369 | ||
370 | str++; | |
371 | if(str[0] == '-') | |
372 | add = 0; | |
373 | else if(str[0] == '+'){ | |
374 | add = 1; | |
375 | } | |
376 | else goto out; | |
377 | ||
378 | str++; | |
379 | diff = memparse(str, &ret); | |
380 | if(*ret != '\0') | |
381 | goto out; | |
382 | ||
383 | diff /= PAGE_SIZE; | |
384 | ||
385 | for(i = 0; i < diff; i++){ | |
386 | struct unplugged_pages *unplugged; | |
387 | void *addr; | |
388 | ||
389 | if(add){ | |
390 | if(list_empty(&unplugged_pages)) | |
391 | break; | |
392 | ||
393 | unplugged = list_entry(unplugged_pages.next, | |
394 | struct unplugged_pages, list); | |
395 | if(unplug_index > 0) | |
396 | addr = unplugged->pages[--unplug_index]; | |
397 | else { | |
398 | list_del(&unplugged->list); | |
399 | addr = unplugged; | |
400 | unplug_index = UNPLUGGED_PER_PAGE; | |
401 | } | |
402 | ||
403 | free_page((unsigned long) addr); | |
404 | unplugged_pages_count--; | |
405 | } | |
406 | else { | |
407 | struct page *page; | |
408 | ||
409 | page = alloc_page(GFP_ATOMIC); | |
410 | if(page == NULL) | |
411 | break; | |
412 | ||
413 | unplugged = page_address(page); | |
414 | if(unplug_index == UNPLUGGED_PER_PAGE){ | |
02dea087 JD |
415 | list_add(&unplugged->list, &unplugged_pages); |
416 | unplug_index = 0; | |
417 | } | |
418 | else { | |
419 | struct list_head *entry = unplugged_pages.next; | |
420 | addr = unplugged; | |
421 | ||
422 | unplugged = list_entry(entry, | |
423 | struct unplugged_pages, | |
424 | list); | |
425 | unplugged->pages[unplug_index++] = addr; | |
426 | err = os_drop_memory(addr, PAGE_SIZE); | |
427 | if(err) | |
428 | printk("Failed to release memory - " | |
429 | "errno = %d\n", err); | |
430 | } | |
431 | ||
432 | unplugged_pages_count++; | |
433 | } | |
434 | } | |
435 | ||
436 | err = 0; | |
437 | out: | |
438 | return err; | |
439 | } | |
440 | ||
441 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
442 | { | |
443 | char buf[sizeof("18446744073709551615")]; | |
444 | int len = 0; | |
445 | ||
446 | sprintf(buf, "%ld", uml_physmem); | |
447 | CONFIG_CHUNK(str, size, len, buf, 1); | |
448 | ||
449 | return len; | |
450 | } | |
451 | ||
452 | static int mem_id(char **str, int *start_out, int *end_out) | |
453 | { | |
454 | *start_out = 0; | |
455 | *end_out = 0; | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static int mem_remove(int n) | |
461 | { | |
462 | return -EBUSY; | |
463 | } | |
464 | ||
465 | static struct mc_device mem_mc = { | |
466 | .name = "mem", | |
467 | .config = mem_config, | |
468 | .get_config = mem_get_config, | |
469 | .id = mem_id, | |
470 | .remove = mem_remove, | |
471 | }; | |
472 | ||
473 | static int mem_mc_init(void) | |
474 | { | |
475 | if(can_drop_memory()) | |
476 | mconsole_register_dev(&mem_mc); | |
477 | else printk("Can't release memory to the host - memory hotplug won't " | |
478 | "be supported\n"); | |
479 | return 0; | |
480 | } | |
481 | ||
482 | __initcall(mem_mc_init); | |
483 | ||
1da177e4 LT |
484 | #define CONFIG_BUF_SIZE 64 |
485 | ||
d50084a2 | 486 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
487 | char **), |
488 | struct mc_request *req, char *name) | |
489 | { | |
490 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
491 | int n, size; | |
492 | ||
493 | if(get_config == NULL){ | |
494 | mconsole_reply(req, "No get_config routine defined", 1, 0); | |
495 | return; | |
496 | } | |
497 | ||
498 | error = NULL; | |
91b165c0 | 499 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
500 | buf = default_buf; |
501 | ||
502 | while(1){ | |
503 | n = (*get_config)(name, buf, size, &error); | |
504 | if(error != NULL){ | |
505 | mconsole_reply(req, error, 1, 0); | |
506 | goto out; | |
507 | } | |
508 | ||
509 | if(n <= size){ | |
510 | mconsole_reply(req, buf, 0, 0); | |
511 | goto out; | |
512 | } | |
513 | ||
514 | if(buf != default_buf) | |
515 | kfree(buf); | |
516 | ||
517 | size = n; | |
518 | buf = kmalloc(size, GFP_KERNEL); | |
519 | if(buf == NULL){ | |
520 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
521 | return; | |
522 | } | |
523 | } | |
524 | out: | |
525 | if(buf != default_buf) | |
526 | kfree(buf); | |
1da177e4 LT |
527 | } |
528 | ||
529 | void mconsole_config(struct mc_request *req) | |
530 | { | |
531 | struct mc_device *dev; | |
532 | char *ptr = req->request.data, *name; | |
533 | int err; | |
534 | ||
535 | ptr += strlen("config"); | |
536 | while(isspace(*ptr)) ptr++; | |
537 | dev = mconsole_find_dev(ptr); | |
538 | if(dev == NULL){ | |
539 | mconsole_reply(req, "Bad configuration option", 1, 0); | |
540 | return; | |
541 | } | |
542 | ||
543 | name = &ptr[strlen(dev->name)]; | |
544 | ptr = name; | |
545 | while((*ptr != '=') && (*ptr != '\0')) | |
546 | ptr++; | |
547 | ||
548 | if(*ptr == '='){ | |
549 | err = (*dev->config)(name); | |
550 | mconsole_reply(req, "", err, 0); | |
551 | } | |
552 | else mconsole_get_config(dev->get_config, req, name); | |
553 | } | |
554 | ||
555 | void mconsole_remove(struct mc_request *req) | |
556 | { | |
d50084a2 | 557 | struct mc_device *dev; |
29d56cfe | 558 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 559 | char error[256]; |
29d56cfe | 560 | int err, start, end, n; |
1da177e4 LT |
561 | |
562 | ptr += strlen("remove"); | |
563 | while(isspace(*ptr)) ptr++; | |
564 | dev = mconsole_find_dev(ptr); | |
565 | if(dev == NULL){ | |
566 | mconsole_reply(req, "Bad remove option", 1, 0); | |
567 | return; | |
568 | } | |
29d56cfe | 569 | |
3a331a51 JD |
570 | ptr = &ptr[strlen(dev->name)]; |
571 | ||
572 | err = 1; | |
573 | n = (*dev->id)(&ptr, &start, &end); | |
574 | if(n < 0){ | |
575 | err_msg = "Couldn't parse device number"; | |
576 | goto out; | |
577 | } | |
578 | else if((n < start) || (n > end)){ | |
579 | sprintf(error, "Invalid device number - must be between " | |
580 | "%d and %d", start, end); | |
581 | err_msg = error; | |
582 | goto out; | |
583 | } | |
29d56cfe JD |
584 | |
585 | err = (*dev->remove)(n); | |
3a331a51 JD |
586 | switch(err){ |
587 | case -ENODEV: | |
588 | err_msg = "Device doesn't exist"; | |
589 | break; | |
590 | case -EBUSY: | |
591 | err_msg = "Device is currently open"; | |
592 | break; | |
593 | default: | |
594 | break; | |
595 | } | |
596 | out: | |
29d56cfe | 597 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
598 | } |
599 | ||
f92afe56 JD |
600 | struct mconsole_output { |
601 | struct list_head list; | |
602 | struct mc_request *req; | |
603 | }; | |
604 | ||
6f517d3f JD |
605 | static DEFINE_SPINLOCK(console_lock); |
606 | static LIST_HEAD(clients); | |
607 | static char console_buf[MCONSOLE_MAX_DATA]; | |
608 | static int console_index = 0; | |
609 | ||
610 | static void console_write(struct console *console, const char *string, | |
611 | unsigned len) | |
612 | { | |
613 | struct list_head *ele; | |
614 | int n; | |
615 | ||
616 | if(list_empty(&clients)) | |
617 | return; | |
618 | ||
619 | while(1){ | |
6dad2d3f | 620 | n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index); |
6f517d3f JD |
621 | strncpy(&console_buf[console_index], string, n); |
622 | console_index += n; | |
623 | string += n; | |
624 | len -= n; | |
625 | if(len == 0) | |
626 | return; | |
627 | ||
628 | list_for_each(ele, &clients){ | |
f92afe56 | 629 | struct mconsole_output *entry; |
6f517d3f | 630 | |
f92afe56 JD |
631 | entry = list_entry(ele, struct mconsole_output, list); |
632 | mconsole_reply_len(entry->req, console_buf, | |
6f517d3f JD |
633 | console_index, 0, 1); |
634 | } | |
635 | ||
636 | console_index = 0; | |
637 | } | |
638 | } | |
639 | ||
640 | static struct console mc_console = { .name = "mc", | |
641 | .write = console_write, | |
a174b30e | 642 | .flags = CON_ENABLED, |
6f517d3f JD |
643 | .index = -1 }; |
644 | ||
645 | static int mc_add_console(void) | |
646 | { | |
647 | register_console(&mc_console); | |
648 | return 0; | |
649 | } | |
650 | ||
651 | late_initcall(mc_add_console); | |
652 | ||
653 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
654 | void *arg) | |
655 | { | |
f92afe56 | 656 | struct mconsole_output entry; |
6f517d3f JD |
657 | unsigned long flags; |
658 | ||
f92afe56 | 659 | entry.req = req; |
6f517d3f JD |
660 | list_add(&entry.list, &clients); |
661 | spin_lock_irqsave(&console_lock, flags); | |
662 | ||
663 | (*proc)(arg); | |
664 | ||
665 | mconsole_reply_len(req, console_buf, console_index, 0, 0); | |
666 | console_index = 0; | |
667 | ||
668 | spin_unlock_irqrestore(&console_lock, flags); | |
669 | list_del(&entry.list); | |
670 | } | |
671 | ||
4111b025 JD |
672 | #ifdef CONFIG_MAGIC_SYSRQ |
673 | static void sysrq_proc(void *arg) | |
674 | { | |
675 | char *op = arg; | |
7bea96fd AV |
676 | struct pt_regs *old_regs = set_irq_regs(¤t->thread.regs); |
677 | handle_sysrq(*op, NULL); | |
678 | set_irq_regs(old_regs); | |
4111b025 JD |
679 | } |
680 | ||
681 | void mconsole_sysrq(struct mc_request *req) | |
682 | { | |
683 | char *ptr = req->request.data; | |
684 | ||
685 | ptr += strlen("sysrq"); | |
686 | while(isspace(*ptr)) ptr++; | |
687 | ||
688 | /* With 'b', the system will shut down without a chance to reply, | |
689 | * so in this case, we reply first. | |
690 | */ | |
691 | if(*ptr == 'b') | |
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 | ||
42947cb9 PBG |
703 | #ifdef CONFIG_MODE_SKAS |
704 | ||
6f517d3f JD |
705 | static void stack_proc(void *arg) |
706 | { | |
707 | struct task_struct *from = current, *to = arg; | |
708 | ||
709 | to->thread.saved_task = from; | |
710 | switch_to(from, to, from); | |
711 | } | |
712 | ||
3eddddcf JD |
713 | /* Mconsole stack trace |
714 | * Added by Allan Graves, Jeff Dike | |
715 | * Dumps a stacks registers to the linux console. | |
716 | * Usage stack <pid>. | |
717 | */ | |
42947cb9 | 718 | static void do_stack_trace(struct mc_request *req) |
3eddddcf | 719 | { |
3a331a51 JD |
720 | char *ptr = req->request.data; |
721 | int pid_requested= -1; | |
6f517d3f | 722 | struct task_struct *from = NULL; |
3eddddcf JD |
723 | struct task_struct *to = NULL; |
724 | ||
3a331a51 JD |
725 | /* Would be nice: |
726 | * 1) Send showregs output to mconsole. | |
3eddddcf JD |
727 | * 2) Add a way to stack dump all pids. |
728 | */ | |
729 | ||
3a331a51 JD |
730 | ptr += strlen("stack"); |
731 | while(isspace(*ptr)) ptr++; | |
3eddddcf | 732 | |
3a331a51 JD |
733 | /* Should really check for multiple pids or reject bad args here */ |
734 | /* What do the arguments in mconsole_reply mean? */ | |
735 | if(sscanf(ptr, "%d", &pid_requested) == 0){ | |
736 | mconsole_reply(req, "Please specify a pid", 1, 0); | |
737 | return; | |
738 | } | |
3eddddcf | 739 | |
6f517d3f | 740 | from = current; |
3eddddcf | 741 | |
6f517d3f | 742 | to = find_task_by_pid(pid_requested); |
3a331a51 JD |
743 | if((to == NULL) || (pid_requested == 0)) { |
744 | mconsole_reply(req, "Couldn't find that pid", 1, 0); | |
745 | return; | |
746 | } | |
6f517d3f | 747 | with_console(req, stack_proc, to); |
3eddddcf | 748 | } |
42947cb9 | 749 | #endif /* CONFIG_MODE_SKAS */ |
3eddddcf JD |
750 | |
751 | void mconsole_stack(struct mc_request *req) | |
752 | { | |
753 | /* This command doesn't work in TT mode, so let's check and then | |
754 | * get out of here | |
755 | */ | |
756 | CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", | |
757 | 1, 0), | |
42947cb9 | 758 | do_stack_trace(req)); |
3eddddcf JD |
759 | } |
760 | ||
1da177e4 LT |
761 | /* Changed by mconsole_setup, which is __setup, and called before SMP is |
762 | * active. | |
763 | */ | |
d50084a2 | 764 | static char *notify_socket = NULL; |
1da177e4 | 765 | |
9010772c | 766 | static int mconsole_init(void) |
1da177e4 LT |
767 | { |
768 | /* long to avoid size mismatch warnings from gcc */ | |
769 | long sock; | |
770 | int err; | |
771 | char file[256]; | |
772 | ||
773 | if(umid_file_name("mconsole", file, sizeof(file))) return(-1); | |
774 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); | |
775 | ||
776 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
777 | if (sock < 0){ | |
778 | printk("Failed to initialize management console\n"); | |
779 | return(1); | |
780 | } | |
781 | ||
782 | register_reboot_notifier(&reboot_notifier); | |
783 | ||
784 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 785 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 LT |
786 | "mconsole", (void *)sock); |
787 | if (err){ | |
788 | printk("Failed to get IRQ for management console\n"); | |
789 | return(1); | |
790 | } | |
791 | ||
792 | if(notify_socket != NULL){ | |
970d6e3a | 793 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
1da177e4 LT |
794 | if(notify_socket != NULL) |
795 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, | |
d50084a2 | 796 | mconsole_socket_name, |
1da177e4 LT |
797 | strlen(mconsole_socket_name) + 1); |
798 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
799 | "string\n"); | |
800 | } | |
801 | ||
d50084a2 | 802 | printk("mconsole (version %d) initialized on %s\n", |
1da177e4 LT |
803 | MCONSOLE_VERSION, mconsole_socket_name); |
804 | return(0); | |
805 | } | |
806 | ||
807 | __initcall(mconsole_init); | |
808 | ||
809 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
810 | unsigned long count, void *data) | |
811 | { | |
812 | char *buf; | |
813 | ||
814 | buf = kmalloc(count + 1, GFP_KERNEL); | |
d50084a2 | 815 | if(buf == NULL) |
1da177e4 LT |
816 | return(-ENOMEM); |
817 | ||
818 | if(copy_from_user(buf, buffer, count)){ | |
819 | count = -EFAULT; | |
820 | goto out; | |
821 | } | |
822 | ||
823 | buf[count] = '\0'; | |
824 | ||
825 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
826 | out: | |
827 | kfree(buf); | |
828 | return(count); | |
829 | } | |
830 | ||
831 | static int create_proc_mconsole(void) | |
832 | { | |
833 | struct proc_dir_entry *ent; | |
834 | ||
835 | if(notify_socket == NULL) return(0); | |
836 | ||
837 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
838 | if(ent == NULL){ | |
30f417c6 | 839 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); |
1da177e4 LT |
840 | return(0); |
841 | } | |
842 | ||
843 | ent->read_proc = NULL; | |
844 | ent->write_proc = write_proc_mconsole; | |
845 | return(0); | |
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 | ||
862 | #define NOTIFY "=notify:" | |
863 | ||
864 | static int mconsole_setup(char *str) | |
865 | { | |
866 | if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ | |
867 | str += strlen(NOTIFY); | |
868 | notify_socket = str; | |
869 | } | |
870 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
871 | return(1); | |
872 | } | |
873 | ||
874 | __setup("mconsole", mconsole_setup); | |
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 | ||
889 | if(notify_socket == NULL) return(0); | |
890 | ||
d50084a2 | 891 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 LT |
892 | strlen(message) + 1); |
893 | return(0); | |
894 | } | |
895 | ||
896 | static struct notifier_block panic_exit_notifier = { | |
897 | .notifier_call = notify_panic, | |
898 | .next = NULL, | |
899 | .priority = 1 | |
900 | }; | |
901 | ||
902 | static int add_notifier(void) | |
903 | { | |
e041c683 AS |
904 | atomic_notifier_chain_register(&panic_notifier_list, |
905 | &panic_exit_notifier); | |
1da177e4 LT |
906 | return(0); |
907 | } | |
908 | ||
909 | __initcall(add_notifier); | |
910 | ||
911 | char *mconsole_notify_socket(void) | |
912 | { | |
913 | return(notify_socket); | |
914 | } | |
915 | ||
916 | EXPORT_SYMBOL(mconsole_notify_socket); |