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" | |
1da177e4 LT |
28 | #include "kern_util.h" |
29 | #include "kern.h" | |
30 | #include "mconsole.h" | |
31 | #include "mconsole_kern.h" | |
32 | #include "irq_user.h" | |
33 | #include "init.h" | |
34 | #include "os.h" | |
1da177e4 | 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 | 56 | |
6d5aefb8 | 57 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
58 | { |
59 | struct mconsole_entry *req; | |
60 | unsigned long flags; | |
61 | ||
62 | while(!list_empty(&mc_requests)){ | |
dbdb4c06 | 63 | local_irq_save(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 | ||
6d5aefb8 | 73 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 74 | |
7bea96fd | 75 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
76 | { |
77 | /* long to avoid size mismatch warnings from gcc */ | |
78 | long fd; | |
79 | struct mconsole_entry *new; | |
3a51237d | 80 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
81 | |
82 | fd = (long) dev_id; | |
83 | while (mconsole_get_request(fd, &req)){ | |
84 | if(req.cmd->context == MCONSOLE_INTR) | |
85 | (*req.cmd->handler)(&req); | |
86 | else { | |
60baa158 | 87 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
1da177e4 LT |
88 | if(new == NULL) |
89 | mconsole_reply(&req, "Out of memory", 1, 0); | |
90 | else { | |
91 | new->request = req; | |
3a51237d | 92 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
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 | ||
e9ff3990 SH |
107 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
108 | utsname()->nodename, utsname()->release, | |
109 | utsname()->version, utsname()->machine); | |
1da177e4 LT |
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\ | |
db805812 | 276 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
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 | ||
1da177e4 LT |
301 | void mconsole_cad(struct mc_request *req) |
302 | { | |
303 | mconsole_reply(req, "", 0, 0); | |
304 | ctrl_alt_del(); | |
305 | } | |
306 | ||
307 | void mconsole_go(struct mc_request *req) | |
308 | { | |
309 | mconsole_reply(req, "Not stopped", 1, 0); | |
310 | } | |
311 | ||
312 | void mconsole_stop(struct mc_request *req) | |
313 | { | |
314 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
315 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d AV |
316 | mconsole_reply(req, "stopped", 0, 0); |
317 | while (mconsole_get_request(req->originating_fd, req)) { | |
318 | if (req->cmd->handler == mconsole_go) | |
319 | break; | |
320 | if (req->cmd->handler == mconsole_stop) { | |
321 | mconsole_reply(req, "Already stopped", 1, 0); | |
322 | continue; | |
323 | } | |
324 | if (req->cmd->handler == mconsole_sysrq) { | |
325 | struct pt_regs *old_regs; | |
326 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
327 | mconsole_sysrq(req); | |
328 | set_irq_regs(old_regs); | |
329 | continue; | |
330 | } | |
1da177e4 LT |
331 | (*req->cmd->handler)(req); |
332 | } | |
333 | os_set_fd_block(req->originating_fd, 0); | |
334 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
335 | mconsole_reply(req, "", 0, 0); | |
336 | } | |
337 | ||
84f48d4f | 338 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 339 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
340 | |
341 | void mconsole_register_dev(struct mc_device *new) | |
342 | { | |
84f48d4f JD |
343 | spin_lock(&mc_devices_lock); |
344 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 345 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 346 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
347 | } |
348 | ||
349 | static struct mc_device *mconsole_find_dev(char *name) | |
350 | { | |
351 | struct list_head *ele; | |
352 | struct mc_device *dev; | |
353 | ||
354 | list_for_each(ele, &mconsole_devices){ | |
355 | dev = list_entry(ele, struct mc_device, list); | |
356 | if(!strncmp(name, dev->name, strlen(dev->name))) | |
357 | return(dev); | |
358 | } | |
359 | return(NULL); | |
360 | } | |
361 | ||
02dea087 JD |
362 | #define UNPLUGGED_PER_PAGE \ |
363 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
364 | ||
365 | struct unplugged_pages { | |
366 | struct list_head list; | |
367 | void *pages[UNPLUGGED_PER_PAGE]; | |
368 | }; | |
369 | ||
84f48d4f | 370 | static DECLARE_MUTEX(plug_mem_mutex); |
02dea087 | 371 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 372 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
373 | static int unplug_index = UNPLUGGED_PER_PAGE; |
374 | ||
f28169d2 | 375 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
376 | { |
377 | unsigned long long diff; | |
378 | int err = -EINVAL, i, add; | |
379 | char *ret; | |
380 | ||
f28169d2 JD |
381 | if(str[0] != '='){ |
382 | *error_out = "Expected '=' after 'mem'"; | |
02dea087 | 383 | goto out; |
f28169d2 | 384 | } |
02dea087 JD |
385 | |
386 | str++; | |
387 | if(str[0] == '-') | |
388 | add = 0; | |
389 | else if(str[0] == '+'){ | |
390 | add = 1; | |
391 | } | |
f28169d2 JD |
392 | else { |
393 | *error_out = "Expected increment to start with '-' or '+'"; | |
394 | goto out; | |
395 | } | |
02dea087 JD |
396 | |
397 | str++; | |
398 | diff = memparse(str, &ret); | |
f28169d2 JD |
399 | if(*ret != '\0'){ |
400 | *error_out = "Failed to parse memory increment"; | |
02dea087 | 401 | goto out; |
f28169d2 | 402 | } |
02dea087 JD |
403 | |
404 | diff /= PAGE_SIZE; | |
405 | ||
84f48d4f | 406 | down(&plug_mem_mutex); |
02dea087 JD |
407 | for(i = 0; i < diff; i++){ |
408 | struct unplugged_pages *unplugged; | |
409 | void *addr; | |
410 | ||
411 | if(add){ | |
412 | if(list_empty(&unplugged_pages)) | |
413 | break; | |
414 | ||
415 | unplugged = list_entry(unplugged_pages.next, | |
416 | struct unplugged_pages, list); | |
417 | if(unplug_index > 0) | |
418 | addr = unplugged->pages[--unplug_index]; | |
419 | else { | |
420 | list_del(&unplugged->list); | |
421 | addr = unplugged; | |
422 | unplug_index = UNPLUGGED_PER_PAGE; | |
423 | } | |
424 | ||
425 | free_page((unsigned long) addr); | |
426 | unplugged_pages_count--; | |
427 | } | |
428 | else { | |
429 | struct page *page; | |
430 | ||
431 | page = alloc_page(GFP_ATOMIC); | |
432 | if(page == NULL) | |
433 | break; | |
434 | ||
435 | unplugged = page_address(page); | |
436 | if(unplug_index == UNPLUGGED_PER_PAGE){ | |
02dea087 JD |
437 | list_add(&unplugged->list, &unplugged_pages); |
438 | unplug_index = 0; | |
439 | } | |
440 | else { | |
441 | struct list_head *entry = unplugged_pages.next; | |
442 | addr = unplugged; | |
443 | ||
444 | unplugged = list_entry(entry, | |
445 | struct unplugged_pages, | |
446 | list); | |
02dea087 | 447 | err = os_drop_memory(addr, PAGE_SIZE); |
f28169d2 | 448 | if(err){ |
02dea087 JD |
449 | printk("Failed to release memory - " |
450 | "errno = %d\n", err); | |
f28169d2 | 451 | *error_out = "Failed to release memory"; |
84f48d4f | 452 | goto out_unlock; |
f28169d2 JD |
453 | } |
454 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
455 | } |
456 | ||
457 | unplugged_pages_count++; | |
458 | } | |
459 | } | |
460 | ||
461 | err = 0; | |
84f48d4f JD |
462 | out_unlock: |
463 | up(&plug_mem_mutex); | |
02dea087 JD |
464 | out: |
465 | return err; | |
466 | } | |
467 | ||
468 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
469 | { | |
470 | char buf[sizeof("18446744073709551615")]; | |
471 | int len = 0; | |
472 | ||
473 | sprintf(buf, "%ld", uml_physmem); | |
474 | CONFIG_CHUNK(str, size, len, buf, 1); | |
475 | ||
476 | return len; | |
477 | } | |
478 | ||
479 | static int mem_id(char **str, int *start_out, int *end_out) | |
480 | { | |
481 | *start_out = 0; | |
482 | *end_out = 0; | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
f28169d2 | 487 | static int mem_remove(int n, char **error_out) |
02dea087 | 488 | { |
f28169d2 | 489 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
490 | return -EBUSY; |
491 | } | |
492 | ||
493 | static struct mc_device mem_mc = { | |
84f48d4f | 494 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
495 | .name = "mem", |
496 | .config = mem_config, | |
497 | .get_config = mem_get_config, | |
498 | .id = mem_id, | |
499 | .remove = mem_remove, | |
500 | }; | |
501 | ||
97a1fcbb | 502 | static int __init mem_mc_init(void) |
02dea087 JD |
503 | { |
504 | if(can_drop_memory()) | |
505 | mconsole_register_dev(&mem_mc); | |
506 | else printk("Can't release memory to the host - memory hotplug won't " | |
507 | "be supported\n"); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | __initcall(mem_mc_init); | |
512 | ||
1da177e4 LT |
513 | #define CONFIG_BUF_SIZE 64 |
514 | ||
d50084a2 | 515 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
516 | char **), |
517 | struct mc_request *req, char *name) | |
518 | { | |
519 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
520 | int n, size; | |
521 | ||
522 | if(get_config == NULL){ | |
523 | mconsole_reply(req, "No get_config routine defined", 1, 0); | |
524 | return; | |
525 | } | |
526 | ||
527 | error = NULL; | |
91b165c0 | 528 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
529 | buf = default_buf; |
530 | ||
531 | while(1){ | |
532 | n = (*get_config)(name, buf, size, &error); | |
533 | if(error != NULL){ | |
534 | mconsole_reply(req, error, 1, 0); | |
535 | goto out; | |
536 | } | |
537 | ||
538 | if(n <= size){ | |
539 | mconsole_reply(req, buf, 0, 0); | |
540 | goto out; | |
541 | } | |
542 | ||
543 | if(buf != default_buf) | |
544 | kfree(buf); | |
545 | ||
546 | size = n; | |
547 | buf = kmalloc(size, GFP_KERNEL); | |
548 | if(buf == NULL){ | |
549 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
550 | return; | |
551 | } | |
552 | } | |
553 | out: | |
554 | if(buf != default_buf) | |
555 | kfree(buf); | |
1da177e4 LT |
556 | } |
557 | ||
558 | void mconsole_config(struct mc_request *req) | |
559 | { | |
560 | struct mc_device *dev; | |
f28169d2 | 561 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
562 | int err; |
563 | ||
564 | ptr += strlen("config"); | |
565 | while(isspace(*ptr)) ptr++; | |
566 | dev = mconsole_find_dev(ptr); | |
567 | if(dev == NULL){ | |
568 | mconsole_reply(req, "Bad configuration option", 1, 0); | |
569 | return; | |
570 | } | |
571 | ||
572 | name = &ptr[strlen(dev->name)]; | |
573 | ptr = name; | |
574 | while((*ptr != '=') && (*ptr != '\0')) | |
575 | ptr++; | |
576 | ||
577 | if(*ptr == '='){ | |
f28169d2 JD |
578 | err = (*dev->config)(name, &error_string); |
579 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
580 | } |
581 | else mconsole_get_config(dev->get_config, req, name); | |
582 | } | |
583 | ||
584 | void mconsole_remove(struct mc_request *req) | |
585 | { | |
d50084a2 | 586 | struct mc_device *dev; |
29d56cfe | 587 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 588 | char error[256]; |
29d56cfe | 589 | int err, start, end, n; |
1da177e4 LT |
590 | |
591 | ptr += strlen("remove"); | |
592 | while(isspace(*ptr)) ptr++; | |
593 | dev = mconsole_find_dev(ptr); | |
594 | if(dev == NULL){ | |
595 | mconsole_reply(req, "Bad remove option", 1, 0); | |
596 | return; | |
597 | } | |
29d56cfe | 598 | |
3a331a51 JD |
599 | ptr = &ptr[strlen(dev->name)]; |
600 | ||
601 | err = 1; | |
602 | n = (*dev->id)(&ptr, &start, &end); | |
603 | if(n < 0){ | |
604 | err_msg = "Couldn't parse device number"; | |
605 | goto out; | |
606 | } | |
607 | else if((n < start) || (n > end)){ | |
608 | sprintf(error, "Invalid device number - must be between " | |
609 | "%d and %d", start, end); | |
610 | err_msg = error; | |
611 | goto out; | |
612 | } | |
29d56cfe | 613 | |
f28169d2 JD |
614 | err_msg = NULL; |
615 | err = (*dev->remove)(n, &err_msg); | |
3a331a51 | 616 | switch(err){ |
d40f6d71 JD |
617 | case 0: |
618 | err_msg = ""; | |
619 | break; | |
3a331a51 | 620 | case -ENODEV: |
f28169d2 JD |
621 | if(err_msg == NULL) |
622 | err_msg = "Device doesn't exist"; | |
3a331a51 JD |
623 | break; |
624 | case -EBUSY: | |
f28169d2 JD |
625 | if(err_msg == NULL) |
626 | err_msg = "Device is currently open"; | |
3a331a51 JD |
627 | break; |
628 | default: | |
629 | break; | |
630 | } | |
631 | out: | |
29d56cfe | 632 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
633 | } |
634 | ||
f92afe56 JD |
635 | struct mconsole_output { |
636 | struct list_head list; | |
637 | struct mc_request *req; | |
638 | }; | |
639 | ||
84f48d4f | 640 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
641 | static LIST_HEAD(clients); |
642 | static char console_buf[MCONSOLE_MAX_DATA]; | |
643 | static int console_index = 0; | |
644 | ||
645 | static void console_write(struct console *console, const char *string, | |
646 | unsigned len) | |
647 | { | |
648 | struct list_head *ele; | |
649 | int n; | |
650 | ||
651 | if(list_empty(&clients)) | |
652 | return; | |
653 | ||
654 | while(1){ | |
6dad2d3f | 655 | n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index); |
6f517d3f JD |
656 | strncpy(&console_buf[console_index], string, n); |
657 | console_index += n; | |
658 | string += n; | |
659 | len -= n; | |
660 | if(len == 0) | |
661 | return; | |
662 | ||
663 | list_for_each(ele, &clients){ | |
f92afe56 | 664 | struct mconsole_output *entry; |
6f517d3f | 665 | |
f92afe56 JD |
666 | entry = list_entry(ele, struct mconsole_output, list); |
667 | mconsole_reply_len(entry->req, console_buf, | |
6f517d3f JD |
668 | console_index, 0, 1); |
669 | } | |
670 | ||
671 | console_index = 0; | |
672 | } | |
673 | } | |
674 | ||
675 | static struct console mc_console = { .name = "mc", | |
676 | .write = console_write, | |
a174b30e | 677 | .flags = CON_ENABLED, |
6f517d3f JD |
678 | .index = -1 }; |
679 | ||
680 | static int mc_add_console(void) | |
681 | { | |
682 | register_console(&mc_console); | |
683 | return 0; | |
684 | } | |
685 | ||
686 | late_initcall(mc_add_console); | |
687 | ||
688 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
689 | void *arg) | |
690 | { | |
f92afe56 | 691 | struct mconsole_output entry; |
6f517d3f JD |
692 | unsigned long flags; |
693 | ||
f92afe56 | 694 | entry.req = req; |
84f48d4f | 695 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 696 | list_add(&entry.list, &clients); |
84f48d4f | 697 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
698 | |
699 | (*proc)(arg); | |
700 | ||
701 | mconsole_reply_len(req, console_buf, console_index, 0, 0); | |
702 | console_index = 0; | |
703 | ||
84f48d4f | 704 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 705 | list_del(&entry.list); |
84f48d4f | 706 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
707 | } |
708 | ||
4111b025 JD |
709 | #ifdef CONFIG_MAGIC_SYSRQ |
710 | static void sysrq_proc(void *arg) | |
711 | { | |
712 | char *op = arg; | |
7bea96fd | 713 | handle_sysrq(*op, NULL); |
4111b025 JD |
714 | } |
715 | ||
716 | void mconsole_sysrq(struct mc_request *req) | |
717 | { | |
718 | char *ptr = req->request.data; | |
719 | ||
720 | ptr += strlen("sysrq"); | |
721 | while(isspace(*ptr)) ptr++; | |
722 | ||
723 | /* With 'b', the system will shut down without a chance to reply, | |
724 | * so in this case, we reply first. | |
725 | */ | |
726 | if(*ptr == 'b') | |
727 | mconsole_reply(req, "", 0, 0); | |
728 | ||
729 | with_console(req, sysrq_proc, ptr); | |
730 | } | |
731 | #else | |
732 | void mconsole_sysrq(struct mc_request *req) | |
733 | { | |
734 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
735 | } | |
736 | #endif | |
737 | ||
42947cb9 PBG |
738 | #ifdef CONFIG_MODE_SKAS |
739 | ||
6f517d3f JD |
740 | static void stack_proc(void *arg) |
741 | { | |
742 | struct task_struct *from = current, *to = arg; | |
743 | ||
744 | to->thread.saved_task = from; | |
745 | switch_to(from, to, from); | |
746 | } | |
747 | ||
3eddddcf JD |
748 | /* Mconsole stack trace |
749 | * Added by Allan Graves, Jeff Dike | |
750 | * Dumps a stacks registers to the linux console. | |
751 | * Usage stack <pid>. | |
752 | */ | |
42947cb9 | 753 | static void do_stack_trace(struct mc_request *req) |
3eddddcf | 754 | { |
3a331a51 JD |
755 | char *ptr = req->request.data; |
756 | int pid_requested= -1; | |
6f517d3f | 757 | struct task_struct *from = NULL; |
3eddddcf JD |
758 | struct task_struct *to = NULL; |
759 | ||
3a331a51 JD |
760 | /* Would be nice: |
761 | * 1) Send showregs output to mconsole. | |
3eddddcf JD |
762 | * 2) Add a way to stack dump all pids. |
763 | */ | |
764 | ||
3a331a51 JD |
765 | ptr += strlen("stack"); |
766 | while(isspace(*ptr)) ptr++; | |
3eddddcf | 767 | |
3a331a51 JD |
768 | /* Should really check for multiple pids or reject bad args here */ |
769 | /* What do the arguments in mconsole_reply mean? */ | |
770 | if(sscanf(ptr, "%d", &pid_requested) == 0){ | |
771 | mconsole_reply(req, "Please specify a pid", 1, 0); | |
772 | return; | |
773 | } | |
3eddddcf | 774 | |
6f517d3f | 775 | from = current; |
3eddddcf | 776 | |
6f517d3f | 777 | to = find_task_by_pid(pid_requested); |
3a331a51 JD |
778 | if((to == NULL) || (pid_requested == 0)) { |
779 | mconsole_reply(req, "Couldn't find that pid", 1, 0); | |
780 | return; | |
781 | } | |
6f517d3f | 782 | with_console(req, stack_proc, to); |
3eddddcf | 783 | } |
42947cb9 | 784 | #endif /* CONFIG_MODE_SKAS */ |
3eddddcf JD |
785 | |
786 | void mconsole_stack(struct mc_request *req) | |
787 | { | |
788 | /* This command doesn't work in TT mode, so let's check and then | |
789 | * get out of here | |
790 | */ | |
791 | CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", | |
792 | 1, 0), | |
42947cb9 | 793 | do_stack_trace(req)); |
3eddddcf JD |
794 | } |
795 | ||
1da177e4 LT |
796 | /* Changed by mconsole_setup, which is __setup, and called before SMP is |
797 | * active. | |
798 | */ | |
d50084a2 | 799 | static char *notify_socket = NULL; |
1da177e4 | 800 | |
97a1fcbb | 801 | static int __init mconsole_init(void) |
1da177e4 LT |
802 | { |
803 | /* long to avoid size mismatch warnings from gcc */ | |
804 | long sock; | |
805 | int err; | |
806 | char file[256]; | |
807 | ||
808 | if(umid_file_name("mconsole", file, sizeof(file))) return(-1); | |
809 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); | |
810 | ||
811 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
812 | if (sock < 0){ | |
813 | printk("Failed to initialize management console\n"); | |
814 | return(1); | |
815 | } | |
816 | ||
817 | register_reboot_notifier(&reboot_notifier); | |
818 | ||
819 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 820 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 LT |
821 | "mconsole", (void *)sock); |
822 | if (err){ | |
823 | printk("Failed to get IRQ for management console\n"); | |
824 | return(1); | |
825 | } | |
826 | ||
827 | if(notify_socket != NULL){ | |
970d6e3a | 828 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
1da177e4 LT |
829 | if(notify_socket != NULL) |
830 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, | |
d50084a2 | 831 | mconsole_socket_name, |
1da177e4 LT |
832 | strlen(mconsole_socket_name) + 1); |
833 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
834 | "string\n"); | |
835 | } | |
836 | ||
d50084a2 | 837 | printk("mconsole (version %d) initialized on %s\n", |
1da177e4 LT |
838 | MCONSOLE_VERSION, mconsole_socket_name); |
839 | return(0); | |
840 | } | |
841 | ||
842 | __initcall(mconsole_init); | |
843 | ||
844 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
845 | unsigned long count, void *data) | |
846 | { | |
847 | char *buf; | |
848 | ||
849 | buf = kmalloc(count + 1, GFP_KERNEL); | |
d50084a2 | 850 | if(buf == NULL) |
1da177e4 LT |
851 | return(-ENOMEM); |
852 | ||
853 | if(copy_from_user(buf, buffer, count)){ | |
854 | count = -EFAULT; | |
855 | goto out; | |
856 | } | |
857 | ||
858 | buf[count] = '\0'; | |
859 | ||
860 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
861 | out: | |
862 | kfree(buf); | |
863 | return(count); | |
864 | } | |
865 | ||
866 | static int create_proc_mconsole(void) | |
867 | { | |
868 | struct proc_dir_entry *ent; | |
869 | ||
870 | if(notify_socket == NULL) return(0); | |
871 | ||
872 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
873 | if(ent == NULL){ | |
30f417c6 | 874 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); |
1da177e4 LT |
875 | return(0); |
876 | } | |
877 | ||
878 | ent->read_proc = NULL; | |
879 | ent->write_proc = write_proc_mconsole; | |
880 | return(0); | |
881 | } | |
882 | ||
883 | static DEFINE_SPINLOCK(notify_spinlock); | |
884 | ||
885 | void lock_notify(void) | |
886 | { | |
887 | spin_lock(¬ify_spinlock); | |
888 | } | |
889 | ||
890 | void unlock_notify(void) | |
891 | { | |
892 | spin_unlock(¬ify_spinlock); | |
893 | } | |
894 | ||
895 | __initcall(create_proc_mconsole); | |
896 | ||
897 | #define NOTIFY "=notify:" | |
898 | ||
899 | static int mconsole_setup(char *str) | |
900 | { | |
901 | if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ | |
902 | str += strlen(NOTIFY); | |
903 | notify_socket = str; | |
904 | } | |
905 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
906 | return(1); | |
907 | } | |
908 | ||
909 | __setup("mconsole", mconsole_setup); | |
910 | ||
911 | __uml_help(mconsole_setup, | |
912 | "mconsole=notify:<socket>\n" | |
913 | " Requests that the mconsole driver send a message to the named Unix\n" | |
914 | " socket containing the name of the mconsole socket. This also serves\n" | |
915 | " to notify outside processes when UML has booted far enough to respond\n" | |
916 | " to mconsole requests.\n\n" | |
917 | ); | |
918 | ||
919 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
920 | void *ptr) | |
921 | { | |
922 | char *message = ptr; | |
923 | ||
924 | if(notify_socket == NULL) return(0); | |
925 | ||
d50084a2 | 926 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 LT |
927 | strlen(message) + 1); |
928 | return(0); | |
929 | } | |
930 | ||
931 | static struct notifier_block panic_exit_notifier = { | |
932 | .notifier_call = notify_panic, | |
933 | .next = NULL, | |
934 | .priority = 1 | |
935 | }; | |
936 | ||
937 | static int add_notifier(void) | |
938 | { | |
e041c683 AS |
939 | atomic_notifier_chain_register(&panic_notifier_list, |
940 | &panic_exit_notifier); | |
1da177e4 LT |
941 | return(0); |
942 | } | |
943 | ||
944 | __initcall(add_notifier); | |
945 | ||
946 | char *mconsole_notify_socket(void) | |
947 | { | |
948 | return(notify_socket); | |
949 | } | |
950 | ||
951 | EXPORT_SYMBOL(mconsole_notify_socket); |