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" | |
6f517d3f | 23 | #include "linux/console.h" |
1da177e4 LT |
24 | #include "asm/irq.h" |
25 | #include "asm/uaccess.h" | |
26 | #include "user_util.h" | |
27 | #include "kern_util.h" | |
28 | #include "kern.h" | |
29 | #include "mconsole.h" | |
30 | #include "mconsole_kern.h" | |
31 | #include "irq_user.h" | |
32 | #include "init.h" | |
33 | #include "os.h" | |
34 | #include "umid.h" | |
35 | #include "irq_kern.h" | |
3eddddcf | 36 | #include "choose-mode.h" |
1da177e4 | 37 | |
d50084a2 | 38 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
39 | unsigned long what, void *data) |
40 | { | |
41 | return(mconsole_unlink_socket()); | |
42 | } | |
43 | ||
44 | ||
45 | static struct notifier_block reboot_notifier = { | |
46 | .notifier_call = do_unlink_socket, | |
47 | .priority = 0, | |
48 | }; | |
49 | ||
d50084a2 | 50 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
51 | * locking, and the interrupt handler is safe because it can't interrupt |
52 | * itself and it can only happen on CPU 0. | |
53 | */ | |
54 | ||
9010772c | 55 | static LIST_HEAD(mc_requests); |
1da177e4 LT |
56 | |
57 | static void mc_work_proc(void *unused) | |
58 | { | |
59 | struct mconsole_entry *req; | |
60 | unsigned long flags; | |
61 | ||
62 | while(!list_empty(&mc_requests)){ | |
63 | local_save_flags(flags); | |
d50084a2 | 64 | req = list_entry(mc_requests.next, struct mconsole_entry, |
1da177e4 LT |
65 | list); |
66 | list_del(&req->list); | |
67 | local_irq_restore(flags); | |
68 | req->request.cmd->handler(&req->request); | |
69 | kfree(req); | |
70 | } | |
71 | } | |
72 | ||
9010772c | 73 | static DECLARE_WORK(mconsole_work, mc_work_proc, NULL); |
1da177e4 LT |
74 | |
75 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id, | |
76 | struct pt_regs *regs) | |
77 | { | |
78 | /* long to avoid size mismatch warnings from gcc */ | |
79 | long fd; | |
80 | struct mconsole_entry *new; | |
81 | struct mc_request req; | |
82 | ||
83 | fd = (long) dev_id; | |
84 | while (mconsole_get_request(fd, &req)){ | |
85 | if(req.cmd->context == MCONSOLE_INTR) | |
86 | (*req.cmd->handler)(&req); | |
87 | else { | |
88 | new = kmalloc(sizeof(*new), GFP_ATOMIC); | |
89 | if(new == NULL) | |
90 | mconsole_reply(&req, "Out of memory", 1, 0); | |
91 | else { | |
92 | new->request = req; | |
93 | list_add(&new->list, &mc_requests); | |
94 | } | |
95 | } | |
96 | } | |
97 | if(!list_empty(&mc_requests)) | |
98 | schedule_work(&mconsole_work); | |
99 | reactivate_fd(fd, MCONSOLE_IRQ); | |
100 | return(IRQ_HANDLED); | |
101 | } | |
102 | ||
103 | void mconsole_version(struct mc_request *req) | |
104 | { | |
105 | char version[256]; | |
106 | ||
d50084a2 JD |
107 | sprintf(version, "%s %s %s %s %s", system_utsname.sysname, |
108 | system_utsname.nodename, system_utsname.release, | |
1da177e4 LT |
109 | system_utsname.version, system_utsname.machine); |
110 | mconsole_reply(req, version, 0, 0); | |
111 | } | |
112 | ||
113 | void mconsole_log(struct mc_request *req) | |
114 | { | |
115 | int len; | |
116 | char *ptr = req->request.data; | |
117 | ||
118 | ptr += strlen("log "); | |
119 | ||
120 | len = req->len - (ptr - req->request.data); | |
121 | printk("%.*s", len, ptr); | |
122 | mconsole_reply(req, "", 0, 0); | |
123 | } | |
124 | ||
125 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
126 | * problems; however, we need it fixed, because it is expected that UML users | |
127 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
128 | * show the real procfs content, not the ones from hppfs.*/ | |
129 | #if 0 | |
130 | void mconsole_proc(struct mc_request *req) | |
131 | { | |
132 | struct nameidata nd; | |
133 | struct file_system_type *proc; | |
134 | struct super_block *super; | |
135 | struct file *file; | |
136 | int n, err; | |
137 | char *ptr = req->request.data, *buf; | |
138 | ||
139 | ptr += strlen("proc"); | |
140 | while(isspace(*ptr)) ptr++; | |
141 | ||
142 | proc = get_fs_type("proc"); | |
143 | if(proc == NULL){ | |
144 | mconsole_reply(req, "procfs not registered", 1, 0); | |
145 | goto out; | |
146 | } | |
147 | ||
148 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
149 | put_filesystem(proc); | |
150 | if(super == NULL){ | |
151 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); | |
152 | goto out; | |
153 | } | |
154 | up_write(&super->s_umount); | |
155 | ||
156 | nd.dentry = super->s_root; | |
157 | nd.mnt = NULL; | |
158 | nd.flags = O_RDONLY + 1; | |
159 | nd.last_type = LAST_ROOT; | |
160 | ||
161 | /* START: it was experienced that the stability problems are closed | |
162 | * if commenting out these two calls + the below read cycle. To | |
163 | * make UML crash again, it was enough to readd either one.*/ | |
164 | err = link_path_walk(ptr, &nd); | |
165 | if(err){ | |
166 | mconsole_reply(req, "Failed to look up file", 1, 0); | |
167 | goto out_kill; | |
168 | } | |
169 | ||
170 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); | |
171 | if(IS_ERR(file)){ | |
172 | mconsole_reply(req, "Failed to open file", 1, 0); | |
173 | goto out_kill; | |
174 | } | |
175 | /*END*/ | |
176 | ||
177 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
178 | if(buf == NULL){ | |
179 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
180 | goto out_fput; | |
181 | } | |
182 | ||
183 | if((file->f_op != NULL) && (file->f_op->read != NULL)){ | |
184 | do { | |
185 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
186 | &file->f_pos); | |
187 | if(n >= 0){ | |
188 | buf[n] = '\0'; | |
189 | mconsole_reply(req, buf, 0, (n > 0)); | |
190 | } | |
191 | else { | |
192 | mconsole_reply(req, "Read of file failed", | |
193 | 1, 0); | |
194 | goto out_free; | |
195 | } | |
196 | } while(n > 0); | |
197 | } | |
198 | else mconsole_reply(req, "", 0, 0); | |
199 | ||
200 | out_free: | |
201 | kfree(buf); | |
202 | out_fput: | |
203 | fput(file); | |
204 | out_kill: | |
205 | deactivate_super(super); | |
206 | out: ; | |
207 | } | |
208 | #endif | |
209 | ||
210 | void mconsole_proc(struct mc_request *req) | |
211 | { | |
212 | char path[64]; | |
213 | char *buf; | |
214 | int len; | |
215 | int fd; | |
216 | int first_chunk = 1; | |
217 | char *ptr = req->request.data; | |
218 | ||
219 | ptr += strlen("proc"); | |
220 | while(isspace(*ptr)) ptr++; | |
221 | snprintf(path, sizeof(path), "/proc/%s", ptr); | |
222 | ||
223 | fd = sys_open(path, 0, 0); | |
224 | if (fd < 0) { | |
225 | mconsole_reply(req, "Failed to open file", 1, 0); | |
226 | printk("open %s: %d\n",path,fd); | |
227 | goto out; | |
228 | } | |
229 | ||
230 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
231 | if(buf == NULL){ | |
232 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
233 | goto out_close; | |
234 | } | |
235 | ||
236 | for (;;) { | |
237 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
238 | if (len < 0) { | |
239 | mconsole_reply(req, "Read of file failed", 1, 0); | |
240 | goto out_free; | |
241 | } | |
242 | /*Begin the file content on his own line.*/ | |
243 | if (first_chunk) { | |
244 | mconsole_reply(req, "\n", 0, 1); | |
245 | first_chunk = 0; | |
246 | } | |
247 | if (len == PAGE_SIZE-1) { | |
248 | buf[len] = '\0'; | |
249 | mconsole_reply(req, buf, 0, 1); | |
250 | } else { | |
251 | buf[len] = '\0'; | |
252 | mconsole_reply(req, buf, 0, 0); | |
253 | break; | |
254 | } | |
255 | } | |
256 | ||
257 | out_free: | |
258 | kfree(buf); | |
259 | out_close: | |
260 | sys_close(fd); | |
261 | out: | |
262 | /* nothing */; | |
263 | } | |
264 | ||
265 | #define UML_MCONSOLE_HELPTEXT \ | |
266 | "Commands: \n\ | |
267 | version - Get kernel version \n\ | |
268 | help - Print this message \n\ | |
269 | halt - Halt UML \n\ | |
270 | reboot - Reboot UML \n\ | |
271 | config <dev>=<config> - Add a new device to UML; \n\ | |
272 | same syntax as command line \n\ | |
273 | config <dev> - Query the configuration of a device \n\ | |
274 | remove <dev> - Remove a device from UML \n\ | |
275 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
276 | cad - invoke the Ctl-Alt-Del handler \n\ | |
277 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ | |
278 | go - continue the UML after a 'stop' \n\ | |
279 | log <string> - make UML enter <string> into the kernel log\n\ | |
280 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 281 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
282 | " |
283 | ||
284 | void mconsole_help(struct mc_request *req) | |
285 | { | |
286 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
287 | } | |
288 | ||
289 | void mconsole_halt(struct mc_request *req) | |
290 | { | |
291 | mconsole_reply(req, "", 0, 0); | |
292 | machine_halt(); | |
293 | } | |
294 | ||
295 | void mconsole_reboot(struct mc_request *req) | |
296 | { | |
297 | mconsole_reply(req, "", 0, 0); | |
298 | machine_restart(NULL); | |
299 | } | |
300 | ||
301 | extern void ctrl_alt_del(void); | |
302 | ||
303 | void mconsole_cad(struct mc_request *req) | |
304 | { | |
305 | mconsole_reply(req, "", 0, 0); | |
306 | ctrl_alt_del(); | |
307 | } | |
308 | ||
309 | void mconsole_go(struct mc_request *req) | |
310 | { | |
311 | mconsole_reply(req, "Not stopped", 1, 0); | |
312 | } | |
313 | ||
314 | void mconsole_stop(struct mc_request *req) | |
315 | { | |
316 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
317 | os_set_fd_block(req->originating_fd, 1); | |
318 | mconsole_reply(req, "", 0, 0); | |
319 | while(mconsole_get_request(req->originating_fd, req)){ | |
320 | if(req->cmd->handler == mconsole_go) break; | |
321 | (*req->cmd->handler)(req); | |
322 | } | |
323 | os_set_fd_block(req->originating_fd, 0); | |
324 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
325 | mconsole_reply(req, "", 0, 0); | |
326 | } | |
327 | ||
328 | /* This list is populated by __initcall routines. */ | |
329 | ||
330 | LIST_HEAD(mconsole_devices); | |
331 | ||
332 | void mconsole_register_dev(struct mc_device *new) | |
333 | { | |
334 | list_add(&new->list, &mconsole_devices); | |
335 | } | |
336 | ||
337 | static struct mc_device *mconsole_find_dev(char *name) | |
338 | { | |
339 | struct list_head *ele; | |
340 | struct mc_device *dev; | |
341 | ||
342 | list_for_each(ele, &mconsole_devices){ | |
343 | dev = list_entry(ele, struct mc_device, list); | |
344 | if(!strncmp(name, dev->name, strlen(dev->name))) | |
345 | return(dev); | |
346 | } | |
347 | return(NULL); | |
348 | } | |
349 | ||
350 | #define CONFIG_BUF_SIZE 64 | |
351 | ||
d50084a2 | 352 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
353 | char **), |
354 | struct mc_request *req, char *name) | |
355 | { | |
356 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
357 | int n, size; | |
358 | ||
359 | if(get_config == NULL){ | |
360 | mconsole_reply(req, "No get_config routine defined", 1, 0); | |
361 | return; | |
362 | } | |
363 | ||
364 | error = NULL; | |
365 | size = sizeof(default_buf)/sizeof(default_buf[0]); | |
366 | buf = default_buf; | |
367 | ||
368 | while(1){ | |
369 | n = (*get_config)(name, buf, size, &error); | |
370 | if(error != NULL){ | |
371 | mconsole_reply(req, error, 1, 0); | |
372 | goto out; | |
373 | } | |
374 | ||
375 | if(n <= size){ | |
376 | mconsole_reply(req, buf, 0, 0); | |
377 | goto out; | |
378 | } | |
379 | ||
380 | if(buf != default_buf) | |
381 | kfree(buf); | |
382 | ||
383 | size = n; | |
384 | buf = kmalloc(size, GFP_KERNEL); | |
385 | if(buf == NULL){ | |
386 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
387 | return; | |
388 | } | |
389 | } | |
390 | out: | |
391 | if(buf != default_buf) | |
392 | kfree(buf); | |
1da177e4 LT |
393 | } |
394 | ||
395 | void mconsole_config(struct mc_request *req) | |
396 | { | |
397 | struct mc_device *dev; | |
398 | char *ptr = req->request.data, *name; | |
399 | int err; | |
400 | ||
401 | ptr += strlen("config"); | |
402 | while(isspace(*ptr)) ptr++; | |
403 | dev = mconsole_find_dev(ptr); | |
404 | if(dev == NULL){ | |
405 | mconsole_reply(req, "Bad configuration option", 1, 0); | |
406 | return; | |
407 | } | |
408 | ||
409 | name = &ptr[strlen(dev->name)]; | |
410 | ptr = name; | |
411 | while((*ptr != '=') && (*ptr != '\0')) | |
412 | ptr++; | |
413 | ||
414 | if(*ptr == '='){ | |
415 | err = (*dev->config)(name); | |
416 | mconsole_reply(req, "", err, 0); | |
417 | } | |
418 | else mconsole_get_config(dev->get_config, req, name); | |
419 | } | |
420 | ||
421 | void mconsole_remove(struct mc_request *req) | |
422 | { | |
d50084a2 | 423 | struct mc_device *dev; |
29d56cfe | 424 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 425 | char error[256]; |
29d56cfe | 426 | int err, start, end, n; |
1da177e4 LT |
427 | |
428 | ptr += strlen("remove"); | |
429 | while(isspace(*ptr)) ptr++; | |
430 | dev = mconsole_find_dev(ptr); | |
431 | if(dev == NULL){ | |
432 | mconsole_reply(req, "Bad remove option", 1, 0); | |
433 | return; | |
434 | } | |
29d56cfe | 435 | |
3a331a51 JD |
436 | ptr = &ptr[strlen(dev->name)]; |
437 | ||
438 | err = 1; | |
439 | n = (*dev->id)(&ptr, &start, &end); | |
440 | if(n < 0){ | |
441 | err_msg = "Couldn't parse device number"; | |
442 | goto out; | |
443 | } | |
444 | else if((n < start) || (n > end)){ | |
445 | sprintf(error, "Invalid device number - must be between " | |
446 | "%d and %d", start, end); | |
447 | err_msg = error; | |
448 | goto out; | |
449 | } | |
29d56cfe JD |
450 | |
451 | err = (*dev->remove)(n); | |
3a331a51 JD |
452 | switch(err){ |
453 | case -ENODEV: | |
454 | err_msg = "Device doesn't exist"; | |
455 | break; | |
456 | case -EBUSY: | |
457 | err_msg = "Device is currently open"; | |
458 | break; | |
459 | default: | |
460 | break; | |
461 | } | |
462 | out: | |
29d56cfe | 463 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
464 | } |
465 | ||
6f517d3f JD |
466 | static DEFINE_SPINLOCK(console_lock); |
467 | static LIST_HEAD(clients); | |
468 | static char console_buf[MCONSOLE_MAX_DATA]; | |
469 | static int console_index = 0; | |
470 | ||
471 | static void console_write(struct console *console, const char *string, | |
472 | unsigned len) | |
473 | { | |
474 | struct list_head *ele; | |
475 | int n; | |
476 | ||
477 | if(list_empty(&clients)) | |
478 | return; | |
479 | ||
480 | while(1){ | |
481 | n = min(len, ARRAY_SIZE(console_buf) - console_index); | |
482 | strncpy(&console_buf[console_index], string, n); | |
483 | console_index += n; | |
484 | string += n; | |
485 | len -= n; | |
486 | if(len == 0) | |
487 | return; | |
488 | ||
489 | list_for_each(ele, &clients){ | |
490 | struct mconsole_entry *entry; | |
491 | ||
492 | entry = list_entry(ele, struct mconsole_entry, list); | |
493 | mconsole_reply_len(&entry->request, console_buf, | |
494 | console_index, 0, 1); | |
495 | } | |
496 | ||
497 | console_index = 0; | |
498 | } | |
499 | } | |
500 | ||
501 | static struct console mc_console = { .name = "mc", | |
502 | .write = console_write, | |
a174b30e | 503 | .flags = CON_ENABLED, |
6f517d3f JD |
504 | .index = -1 }; |
505 | ||
506 | static int mc_add_console(void) | |
507 | { | |
508 | register_console(&mc_console); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | late_initcall(mc_add_console); | |
513 | ||
514 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
515 | void *arg) | |
516 | { | |
517 | struct mconsole_entry entry; | |
518 | unsigned long flags; | |
519 | ||
520 | INIT_LIST_HEAD(&entry.list); | |
521 | entry.request = *req; | |
522 | list_add(&entry.list, &clients); | |
523 | spin_lock_irqsave(&console_lock, flags); | |
524 | ||
525 | (*proc)(arg); | |
526 | ||
527 | mconsole_reply_len(req, console_buf, console_index, 0, 0); | |
528 | console_index = 0; | |
529 | ||
530 | spin_unlock_irqrestore(&console_lock, flags); | |
531 | list_del(&entry.list); | |
532 | } | |
533 | ||
4111b025 JD |
534 | #ifdef CONFIG_MAGIC_SYSRQ |
535 | static void sysrq_proc(void *arg) | |
536 | { | |
537 | char *op = arg; | |
538 | ||
539 | handle_sysrq(*op, ¤t->thread.regs, NULL); | |
540 | } | |
541 | ||
542 | void mconsole_sysrq(struct mc_request *req) | |
543 | { | |
544 | char *ptr = req->request.data; | |
545 | ||
546 | ptr += strlen("sysrq"); | |
547 | while(isspace(*ptr)) ptr++; | |
548 | ||
549 | /* With 'b', the system will shut down without a chance to reply, | |
550 | * so in this case, we reply first. | |
551 | */ | |
552 | if(*ptr == 'b') | |
553 | mconsole_reply(req, "", 0, 0); | |
554 | ||
555 | with_console(req, sysrq_proc, ptr); | |
556 | } | |
557 | #else | |
558 | void mconsole_sysrq(struct mc_request *req) | |
559 | { | |
560 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
561 | } | |
562 | #endif | |
563 | ||
6f517d3f JD |
564 | static void stack_proc(void *arg) |
565 | { | |
566 | struct task_struct *from = current, *to = arg; | |
567 | ||
568 | to->thread.saved_task = from; | |
569 | switch_to(from, to, from); | |
570 | } | |
571 | ||
3eddddcf JD |
572 | /* Mconsole stack trace |
573 | * Added by Allan Graves, Jeff Dike | |
574 | * Dumps a stacks registers to the linux console. | |
575 | * Usage stack <pid>. | |
576 | */ | |
577 | void do_stack(struct mc_request *req) | |
578 | { | |
3a331a51 JD |
579 | char *ptr = req->request.data; |
580 | int pid_requested= -1; | |
6f517d3f | 581 | struct task_struct *from = NULL; |
3eddddcf JD |
582 | struct task_struct *to = NULL; |
583 | ||
3a331a51 JD |
584 | /* Would be nice: |
585 | * 1) Send showregs output to mconsole. | |
3eddddcf JD |
586 | * 2) Add a way to stack dump all pids. |
587 | */ | |
588 | ||
3a331a51 JD |
589 | ptr += strlen("stack"); |
590 | while(isspace(*ptr)) ptr++; | |
3eddddcf | 591 | |
3a331a51 JD |
592 | /* Should really check for multiple pids or reject bad args here */ |
593 | /* What do the arguments in mconsole_reply mean? */ | |
594 | if(sscanf(ptr, "%d", &pid_requested) == 0){ | |
595 | mconsole_reply(req, "Please specify a pid", 1, 0); | |
596 | return; | |
597 | } | |
3eddddcf | 598 | |
6f517d3f | 599 | from = current; |
3eddddcf | 600 | |
6f517d3f | 601 | to = find_task_by_pid(pid_requested); |
3a331a51 JD |
602 | if((to == NULL) || (pid_requested == 0)) { |
603 | mconsole_reply(req, "Couldn't find that pid", 1, 0); | |
604 | return; | |
605 | } | |
6f517d3f | 606 | with_console(req, stack_proc, to); |
3eddddcf JD |
607 | } |
608 | ||
609 | void mconsole_stack(struct mc_request *req) | |
610 | { | |
611 | /* This command doesn't work in TT mode, so let's check and then | |
612 | * get out of here | |
613 | */ | |
614 | CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", | |
615 | 1, 0), | |
616 | do_stack(req)); | |
617 | } | |
618 | ||
1da177e4 LT |
619 | /* Changed by mconsole_setup, which is __setup, and called before SMP is |
620 | * active. | |
621 | */ | |
d50084a2 | 622 | static char *notify_socket = NULL; |
1da177e4 | 623 | |
9010772c | 624 | static int mconsole_init(void) |
1da177e4 LT |
625 | { |
626 | /* long to avoid size mismatch warnings from gcc */ | |
627 | long sock; | |
628 | int err; | |
629 | char file[256]; | |
630 | ||
631 | if(umid_file_name("mconsole", file, sizeof(file))) return(-1); | |
632 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); | |
633 | ||
634 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
635 | if (sock < 0){ | |
636 | printk("Failed to initialize management console\n"); | |
637 | return(1); | |
638 | } | |
639 | ||
640 | register_reboot_notifier(&reboot_notifier); | |
641 | ||
642 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
643 | SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, | |
644 | "mconsole", (void *)sock); | |
645 | if (err){ | |
646 | printk("Failed to get IRQ for management console\n"); | |
647 | return(1); | |
648 | } | |
649 | ||
650 | if(notify_socket != NULL){ | |
970d6e3a | 651 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
1da177e4 LT |
652 | if(notify_socket != NULL) |
653 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, | |
d50084a2 | 654 | mconsole_socket_name, |
1da177e4 LT |
655 | strlen(mconsole_socket_name) + 1); |
656 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
657 | "string\n"); | |
658 | } | |
659 | ||
d50084a2 | 660 | printk("mconsole (version %d) initialized on %s\n", |
1da177e4 LT |
661 | MCONSOLE_VERSION, mconsole_socket_name); |
662 | return(0); | |
663 | } | |
664 | ||
665 | __initcall(mconsole_init); | |
666 | ||
667 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
668 | unsigned long count, void *data) | |
669 | { | |
670 | char *buf; | |
671 | ||
672 | buf = kmalloc(count + 1, GFP_KERNEL); | |
d50084a2 | 673 | if(buf == NULL) |
1da177e4 LT |
674 | return(-ENOMEM); |
675 | ||
676 | if(copy_from_user(buf, buffer, count)){ | |
677 | count = -EFAULT; | |
678 | goto out; | |
679 | } | |
680 | ||
681 | buf[count] = '\0'; | |
682 | ||
683 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
684 | out: | |
685 | kfree(buf); | |
686 | return(count); | |
687 | } | |
688 | ||
689 | static int create_proc_mconsole(void) | |
690 | { | |
691 | struct proc_dir_entry *ent; | |
692 | ||
693 | if(notify_socket == NULL) return(0); | |
694 | ||
695 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
696 | if(ent == NULL){ | |
30f417c6 | 697 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); |
1da177e4 LT |
698 | return(0); |
699 | } | |
700 | ||
701 | ent->read_proc = NULL; | |
702 | ent->write_proc = write_proc_mconsole; | |
703 | return(0); | |
704 | } | |
705 | ||
706 | static DEFINE_SPINLOCK(notify_spinlock); | |
707 | ||
708 | void lock_notify(void) | |
709 | { | |
710 | spin_lock(¬ify_spinlock); | |
711 | } | |
712 | ||
713 | void unlock_notify(void) | |
714 | { | |
715 | spin_unlock(¬ify_spinlock); | |
716 | } | |
717 | ||
718 | __initcall(create_proc_mconsole); | |
719 | ||
720 | #define NOTIFY "=notify:" | |
721 | ||
722 | static int mconsole_setup(char *str) | |
723 | { | |
724 | if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ | |
725 | str += strlen(NOTIFY); | |
726 | notify_socket = str; | |
727 | } | |
728 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
729 | return(1); | |
730 | } | |
731 | ||
732 | __setup("mconsole", mconsole_setup); | |
733 | ||
734 | __uml_help(mconsole_setup, | |
735 | "mconsole=notify:<socket>\n" | |
736 | " Requests that the mconsole driver send a message to the named Unix\n" | |
737 | " socket containing the name of the mconsole socket. This also serves\n" | |
738 | " to notify outside processes when UML has booted far enough to respond\n" | |
739 | " to mconsole requests.\n\n" | |
740 | ); | |
741 | ||
742 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
743 | void *ptr) | |
744 | { | |
745 | char *message = ptr; | |
746 | ||
747 | if(notify_socket == NULL) return(0); | |
748 | ||
d50084a2 | 749 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 LT |
750 | strlen(message) + 1); |
751 | return(0); | |
752 | } | |
753 | ||
754 | static struct notifier_block panic_exit_notifier = { | |
755 | .notifier_call = notify_panic, | |
756 | .next = NULL, | |
757 | .priority = 1 | |
758 | }; | |
759 | ||
760 | static int add_notifier(void) | |
761 | { | |
762 | notifier_chain_register(&panic_notifier_list, &panic_exit_notifier); | |
763 | return(0); | |
764 | } | |
765 | ||
766 | __initcall(add_notifier); | |
767 | ||
768 | char *mconsole_notify_socket(void) | |
769 | { | |
770 | return(notify_socket); | |
771 | } | |
772 | ||
773 | EXPORT_SYMBOL(mconsole_notify_socket); |