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" | |
1da177e4 | 36 | #include "irq_kern.h" |
3eddddcf | 37 | #include "choose-mode.h" |
1da177e4 | 38 | |
d50084a2 | 39 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
40 | unsigned long what, void *data) |
41 | { | |
42 | return(mconsole_unlink_socket()); | |
43 | } | |
44 | ||
45 | ||
46 | static struct notifier_block reboot_notifier = { | |
47 | .notifier_call = do_unlink_socket, | |
48 | .priority = 0, | |
49 | }; | |
50 | ||
d50084a2 | 51 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
52 | * locking, and the interrupt handler is safe because it can't interrupt |
53 | * itself and it can only happen on CPU 0. | |
54 | */ | |
55 | ||
9010772c | 56 | static LIST_HEAD(mc_requests); |
1da177e4 | 57 | |
6d5aefb8 | 58 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
59 | { |
60 | struct mconsole_entry *req; | |
61 | unsigned long flags; | |
62 | ||
63 | while(!list_empty(&mc_requests)){ | |
dbdb4c06 | 64 | local_irq_save(flags); |
d50084a2 | 65 | req = list_entry(mc_requests.next, struct mconsole_entry, |
1da177e4 LT |
66 | list); |
67 | list_del(&req->list); | |
68 | local_irq_restore(flags); | |
69 | req->request.cmd->handler(&req->request); | |
70 | kfree(req); | |
71 | } | |
72 | } | |
73 | ||
6d5aefb8 | 74 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 75 | |
7bea96fd | 76 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
77 | { |
78 | /* long to avoid size mismatch warnings from gcc */ | |
79 | long fd; | |
80 | struct mconsole_entry *new; | |
3a51237d | 81 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
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 { | |
60baa158 | 88 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
1da177e4 LT |
89 | if(new == NULL) |
90 | mconsole_reply(&req, "Out of memory", 1, 0); | |
91 | else { | |
92 | new->request = req; | |
3a51237d | 93 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
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); | |
3a51237d AV |
317 | mconsole_reply(req, "stopped", 0, 0); |
318 | while (mconsole_get_request(req->originating_fd, req)) { | |
319 | if (req->cmd->handler == mconsole_go) | |
320 | break; | |
321 | if (req->cmd->handler == mconsole_stop) { | |
322 | mconsole_reply(req, "Already stopped", 1, 0); | |
323 | continue; | |
324 | } | |
325 | if (req->cmd->handler == mconsole_sysrq) { | |
326 | struct pt_regs *old_regs; | |
327 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
328 | mconsole_sysrq(req); | |
329 | set_irq_regs(old_regs); | |
330 | continue; | |
331 | } | |
1da177e4 LT |
332 | (*req->cmd->handler)(req); |
333 | } | |
334 | os_set_fd_block(req->originating_fd, 0); | |
335 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
336 | mconsole_reply(req, "", 0, 0); | |
337 | } | |
338 | ||
84f48d4f | 339 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 340 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
341 | |
342 | void mconsole_register_dev(struct mc_device *new) | |
343 | { | |
84f48d4f JD |
344 | spin_lock(&mc_devices_lock); |
345 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 346 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 347 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
348 | } |
349 | ||
350 | static struct mc_device *mconsole_find_dev(char *name) | |
351 | { | |
352 | struct list_head *ele; | |
353 | struct mc_device *dev; | |
354 | ||
355 | list_for_each(ele, &mconsole_devices){ | |
356 | dev = list_entry(ele, struct mc_device, list); | |
357 | if(!strncmp(name, dev->name, strlen(dev->name))) | |
358 | return(dev); | |
359 | } | |
360 | return(NULL); | |
361 | } | |
362 | ||
02dea087 JD |
363 | #define UNPLUGGED_PER_PAGE \ |
364 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
365 | ||
366 | struct unplugged_pages { | |
367 | struct list_head list; | |
368 | void *pages[UNPLUGGED_PER_PAGE]; | |
369 | }; | |
370 | ||
84f48d4f | 371 | static DECLARE_MUTEX(plug_mem_mutex); |
02dea087 | 372 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 373 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
374 | static int unplug_index = UNPLUGGED_PER_PAGE; |
375 | ||
f28169d2 | 376 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
377 | { |
378 | unsigned long long diff; | |
379 | int err = -EINVAL, i, add; | |
380 | char *ret; | |
381 | ||
f28169d2 JD |
382 | if(str[0] != '='){ |
383 | *error_out = "Expected '=' after 'mem'"; | |
02dea087 | 384 | goto out; |
f28169d2 | 385 | } |
02dea087 JD |
386 | |
387 | str++; | |
388 | if(str[0] == '-') | |
389 | add = 0; | |
390 | else if(str[0] == '+'){ | |
391 | add = 1; | |
392 | } | |
f28169d2 JD |
393 | else { |
394 | *error_out = "Expected increment to start with '-' or '+'"; | |
395 | goto out; | |
396 | } | |
02dea087 JD |
397 | |
398 | str++; | |
399 | diff = memparse(str, &ret); | |
f28169d2 JD |
400 | if(*ret != '\0'){ |
401 | *error_out = "Failed to parse memory increment"; | |
02dea087 | 402 | goto out; |
f28169d2 | 403 | } |
02dea087 JD |
404 | |
405 | diff /= PAGE_SIZE; | |
406 | ||
84f48d4f | 407 | down(&plug_mem_mutex); |
02dea087 JD |
408 | for(i = 0; i < diff; i++){ |
409 | struct unplugged_pages *unplugged; | |
410 | void *addr; | |
411 | ||
412 | if(add){ | |
413 | if(list_empty(&unplugged_pages)) | |
414 | break; | |
415 | ||
416 | unplugged = list_entry(unplugged_pages.next, | |
417 | struct unplugged_pages, list); | |
418 | if(unplug_index > 0) | |
419 | addr = unplugged->pages[--unplug_index]; | |
420 | else { | |
421 | list_del(&unplugged->list); | |
422 | addr = unplugged; | |
423 | unplug_index = UNPLUGGED_PER_PAGE; | |
424 | } | |
425 | ||
426 | free_page((unsigned long) addr); | |
427 | unplugged_pages_count--; | |
428 | } | |
429 | else { | |
430 | struct page *page; | |
431 | ||
432 | page = alloc_page(GFP_ATOMIC); | |
433 | if(page == NULL) | |
434 | break; | |
435 | ||
436 | unplugged = page_address(page); | |
437 | if(unplug_index == UNPLUGGED_PER_PAGE){ | |
02dea087 JD |
438 | list_add(&unplugged->list, &unplugged_pages); |
439 | unplug_index = 0; | |
440 | } | |
441 | else { | |
442 | struct list_head *entry = unplugged_pages.next; | |
443 | addr = unplugged; | |
444 | ||
445 | unplugged = list_entry(entry, | |
446 | struct unplugged_pages, | |
447 | list); | |
02dea087 | 448 | err = os_drop_memory(addr, PAGE_SIZE); |
f28169d2 | 449 | if(err){ |
02dea087 JD |
450 | printk("Failed to release memory - " |
451 | "errno = %d\n", err); | |
f28169d2 | 452 | *error_out = "Failed to release memory"; |
84f48d4f | 453 | goto out_unlock; |
f28169d2 JD |
454 | } |
455 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
456 | } |
457 | ||
458 | unplugged_pages_count++; | |
459 | } | |
460 | } | |
461 | ||
462 | err = 0; | |
84f48d4f JD |
463 | out_unlock: |
464 | up(&plug_mem_mutex); | |
02dea087 JD |
465 | out: |
466 | return err; | |
467 | } | |
468 | ||
469 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
470 | { | |
471 | char buf[sizeof("18446744073709551615")]; | |
472 | int len = 0; | |
473 | ||
474 | sprintf(buf, "%ld", uml_physmem); | |
475 | CONFIG_CHUNK(str, size, len, buf, 1); | |
476 | ||
477 | return len; | |
478 | } | |
479 | ||
480 | static int mem_id(char **str, int *start_out, int *end_out) | |
481 | { | |
482 | *start_out = 0; | |
483 | *end_out = 0; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
f28169d2 | 488 | static int mem_remove(int n, char **error_out) |
02dea087 | 489 | { |
f28169d2 | 490 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
491 | return -EBUSY; |
492 | } | |
493 | ||
494 | static struct mc_device mem_mc = { | |
84f48d4f | 495 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
496 | .name = "mem", |
497 | .config = mem_config, | |
498 | .get_config = mem_get_config, | |
499 | .id = mem_id, | |
500 | .remove = mem_remove, | |
501 | }; | |
502 | ||
503 | static int mem_mc_init(void) | |
504 | { | |
505 | if(can_drop_memory()) | |
506 | mconsole_register_dev(&mem_mc); | |
507 | else printk("Can't release memory to the host - memory hotplug won't " | |
508 | "be supported\n"); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | __initcall(mem_mc_init); | |
513 | ||
1da177e4 LT |
514 | #define CONFIG_BUF_SIZE 64 |
515 | ||
d50084a2 | 516 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
517 | char **), |
518 | struct mc_request *req, char *name) | |
519 | { | |
520 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
521 | int n, size; | |
522 | ||
523 | if(get_config == NULL){ | |
524 | mconsole_reply(req, "No get_config routine defined", 1, 0); | |
525 | return; | |
526 | } | |
527 | ||
528 | error = NULL; | |
91b165c0 | 529 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
530 | buf = default_buf; |
531 | ||
532 | while(1){ | |
533 | n = (*get_config)(name, buf, size, &error); | |
534 | if(error != NULL){ | |
535 | mconsole_reply(req, error, 1, 0); | |
536 | goto out; | |
537 | } | |
538 | ||
539 | if(n <= size){ | |
540 | mconsole_reply(req, buf, 0, 0); | |
541 | goto out; | |
542 | } | |
543 | ||
544 | if(buf != default_buf) | |
545 | kfree(buf); | |
546 | ||
547 | size = n; | |
548 | buf = kmalloc(size, GFP_KERNEL); | |
549 | if(buf == NULL){ | |
550 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); | |
551 | return; | |
552 | } | |
553 | } | |
554 | out: | |
555 | if(buf != default_buf) | |
556 | kfree(buf); | |
1da177e4 LT |
557 | } |
558 | ||
559 | void mconsole_config(struct mc_request *req) | |
560 | { | |
561 | struct mc_device *dev; | |
f28169d2 | 562 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
563 | int err; |
564 | ||
565 | ptr += strlen("config"); | |
566 | while(isspace(*ptr)) ptr++; | |
567 | dev = mconsole_find_dev(ptr); | |
568 | if(dev == NULL){ | |
569 | mconsole_reply(req, "Bad configuration option", 1, 0); | |
570 | return; | |
571 | } | |
572 | ||
573 | name = &ptr[strlen(dev->name)]; | |
574 | ptr = name; | |
575 | while((*ptr != '=') && (*ptr != '\0')) | |
576 | ptr++; | |
577 | ||
578 | if(*ptr == '='){ | |
f28169d2 JD |
579 | err = (*dev->config)(name, &error_string); |
580 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
581 | } |
582 | else mconsole_get_config(dev->get_config, req, name); | |
583 | } | |
584 | ||
585 | void mconsole_remove(struct mc_request *req) | |
586 | { | |
d50084a2 | 587 | struct mc_device *dev; |
29d56cfe | 588 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 589 | char error[256]; |
29d56cfe | 590 | int err, start, end, n; |
1da177e4 LT |
591 | |
592 | ptr += strlen("remove"); | |
593 | while(isspace(*ptr)) ptr++; | |
594 | dev = mconsole_find_dev(ptr); | |
595 | if(dev == NULL){ | |
596 | mconsole_reply(req, "Bad remove option", 1, 0); | |
597 | return; | |
598 | } | |
29d56cfe | 599 | |
3a331a51 JD |
600 | ptr = &ptr[strlen(dev->name)]; |
601 | ||
602 | err = 1; | |
603 | n = (*dev->id)(&ptr, &start, &end); | |
604 | if(n < 0){ | |
605 | err_msg = "Couldn't parse device number"; | |
606 | goto out; | |
607 | } | |
608 | else if((n < start) || (n > end)){ | |
609 | sprintf(error, "Invalid device number - must be between " | |
610 | "%d and %d", start, end); | |
611 | err_msg = error; | |
612 | goto out; | |
613 | } | |
29d56cfe | 614 | |
f28169d2 JD |
615 | err_msg = NULL; |
616 | err = (*dev->remove)(n, &err_msg); | |
3a331a51 JD |
617 | switch(err){ |
618 | case -ENODEV: | |
f28169d2 JD |
619 | if(err_msg == NULL) |
620 | err_msg = "Device doesn't exist"; | |
3a331a51 JD |
621 | break; |
622 | case -EBUSY: | |
f28169d2 JD |
623 | if(err_msg == NULL) |
624 | err_msg = "Device is currently open"; | |
3a331a51 JD |
625 | break; |
626 | default: | |
627 | break; | |
628 | } | |
629 | out: | |
29d56cfe | 630 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
631 | } |
632 | ||
f92afe56 JD |
633 | struct mconsole_output { |
634 | struct list_head list; | |
635 | struct mc_request *req; | |
636 | }; | |
637 | ||
84f48d4f | 638 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
639 | static LIST_HEAD(clients); |
640 | static char console_buf[MCONSOLE_MAX_DATA]; | |
641 | static int console_index = 0; | |
642 | ||
643 | static void console_write(struct console *console, const char *string, | |
644 | unsigned len) | |
645 | { | |
646 | struct list_head *ele; | |
647 | int n; | |
648 | ||
649 | if(list_empty(&clients)) | |
650 | return; | |
651 | ||
652 | while(1){ | |
6dad2d3f | 653 | n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index); |
6f517d3f JD |
654 | strncpy(&console_buf[console_index], string, n); |
655 | console_index += n; | |
656 | string += n; | |
657 | len -= n; | |
658 | if(len == 0) | |
659 | return; | |
660 | ||
661 | list_for_each(ele, &clients){ | |
f92afe56 | 662 | struct mconsole_output *entry; |
6f517d3f | 663 | |
f92afe56 JD |
664 | entry = list_entry(ele, struct mconsole_output, list); |
665 | mconsole_reply_len(entry->req, console_buf, | |
6f517d3f JD |
666 | console_index, 0, 1); |
667 | } | |
668 | ||
669 | console_index = 0; | |
670 | } | |
671 | } | |
672 | ||
673 | static struct console mc_console = { .name = "mc", | |
674 | .write = console_write, | |
a174b30e | 675 | .flags = CON_ENABLED, |
6f517d3f JD |
676 | .index = -1 }; |
677 | ||
678 | static int mc_add_console(void) | |
679 | { | |
680 | register_console(&mc_console); | |
681 | return 0; | |
682 | } | |
683 | ||
684 | late_initcall(mc_add_console); | |
685 | ||
686 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
687 | void *arg) | |
688 | { | |
f92afe56 | 689 | struct mconsole_output entry; |
6f517d3f JD |
690 | unsigned long flags; |
691 | ||
f92afe56 | 692 | entry.req = req; |
84f48d4f | 693 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 694 | list_add(&entry.list, &clients); |
84f48d4f | 695 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
696 | |
697 | (*proc)(arg); | |
698 | ||
699 | mconsole_reply_len(req, console_buf, console_index, 0, 0); | |
700 | console_index = 0; | |
701 | ||
84f48d4f | 702 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 703 | list_del(&entry.list); |
84f48d4f | 704 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
705 | } |
706 | ||
4111b025 JD |
707 | #ifdef CONFIG_MAGIC_SYSRQ |
708 | static void sysrq_proc(void *arg) | |
709 | { | |
710 | char *op = arg; | |
7bea96fd | 711 | handle_sysrq(*op, NULL); |
4111b025 JD |
712 | } |
713 | ||
714 | void mconsole_sysrq(struct mc_request *req) | |
715 | { | |
716 | char *ptr = req->request.data; | |
717 | ||
718 | ptr += strlen("sysrq"); | |
719 | while(isspace(*ptr)) ptr++; | |
720 | ||
721 | /* With 'b', the system will shut down without a chance to reply, | |
722 | * so in this case, we reply first. | |
723 | */ | |
724 | if(*ptr == 'b') | |
725 | mconsole_reply(req, "", 0, 0); | |
726 | ||
727 | with_console(req, sysrq_proc, ptr); | |
728 | } | |
729 | #else | |
730 | void mconsole_sysrq(struct mc_request *req) | |
731 | { | |
732 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
733 | } | |
734 | #endif | |
735 | ||
42947cb9 PBG |
736 | #ifdef CONFIG_MODE_SKAS |
737 | ||
6f517d3f JD |
738 | static void stack_proc(void *arg) |
739 | { | |
740 | struct task_struct *from = current, *to = arg; | |
741 | ||
742 | to->thread.saved_task = from; | |
743 | switch_to(from, to, from); | |
744 | } | |
745 | ||
3eddddcf JD |
746 | /* Mconsole stack trace |
747 | * Added by Allan Graves, Jeff Dike | |
748 | * Dumps a stacks registers to the linux console. | |
749 | * Usage stack <pid>. | |
750 | */ | |
42947cb9 | 751 | static void do_stack_trace(struct mc_request *req) |
3eddddcf | 752 | { |
3a331a51 JD |
753 | char *ptr = req->request.data; |
754 | int pid_requested= -1; | |
6f517d3f | 755 | struct task_struct *from = NULL; |
3eddddcf JD |
756 | struct task_struct *to = NULL; |
757 | ||
3a331a51 JD |
758 | /* Would be nice: |
759 | * 1) Send showregs output to mconsole. | |
3eddddcf JD |
760 | * 2) Add a way to stack dump all pids. |
761 | */ | |
762 | ||
3a331a51 JD |
763 | ptr += strlen("stack"); |
764 | while(isspace(*ptr)) ptr++; | |
3eddddcf | 765 | |
3a331a51 JD |
766 | /* Should really check for multiple pids or reject bad args here */ |
767 | /* What do the arguments in mconsole_reply mean? */ | |
768 | if(sscanf(ptr, "%d", &pid_requested) == 0){ | |
769 | mconsole_reply(req, "Please specify a pid", 1, 0); | |
770 | return; | |
771 | } | |
3eddddcf | 772 | |
6f517d3f | 773 | from = current; |
3eddddcf | 774 | |
6f517d3f | 775 | to = find_task_by_pid(pid_requested); |
3a331a51 JD |
776 | if((to == NULL) || (pid_requested == 0)) { |
777 | mconsole_reply(req, "Couldn't find that pid", 1, 0); | |
778 | return; | |
779 | } | |
6f517d3f | 780 | with_console(req, stack_proc, to); |
3eddddcf | 781 | } |
42947cb9 | 782 | #endif /* CONFIG_MODE_SKAS */ |
3eddddcf JD |
783 | |
784 | void mconsole_stack(struct mc_request *req) | |
785 | { | |
786 | /* This command doesn't work in TT mode, so let's check and then | |
787 | * get out of here | |
788 | */ | |
789 | CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", | |
790 | 1, 0), | |
42947cb9 | 791 | do_stack_trace(req)); |
3eddddcf JD |
792 | } |
793 | ||
1da177e4 LT |
794 | /* Changed by mconsole_setup, which is __setup, and called before SMP is |
795 | * active. | |
796 | */ | |
d50084a2 | 797 | static char *notify_socket = NULL; |
1da177e4 | 798 | |
9010772c | 799 | static int mconsole_init(void) |
1da177e4 LT |
800 | { |
801 | /* long to avoid size mismatch warnings from gcc */ | |
802 | long sock; | |
803 | int err; | |
804 | char file[256]; | |
805 | ||
806 | if(umid_file_name("mconsole", file, sizeof(file))) return(-1); | |
807 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); | |
808 | ||
809 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
810 | if (sock < 0){ | |
811 | printk("Failed to initialize management console\n"); | |
812 | return(1); | |
813 | } | |
814 | ||
815 | register_reboot_notifier(&reboot_notifier); | |
816 | ||
817 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 818 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 LT |
819 | "mconsole", (void *)sock); |
820 | if (err){ | |
821 | printk("Failed to get IRQ for management console\n"); | |
822 | return(1); | |
823 | } | |
824 | ||
825 | if(notify_socket != NULL){ | |
970d6e3a | 826 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
1da177e4 LT |
827 | if(notify_socket != NULL) |
828 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, | |
d50084a2 | 829 | mconsole_socket_name, |
1da177e4 LT |
830 | strlen(mconsole_socket_name) + 1); |
831 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
832 | "string\n"); | |
833 | } | |
834 | ||
d50084a2 | 835 | printk("mconsole (version %d) initialized on %s\n", |
1da177e4 LT |
836 | MCONSOLE_VERSION, mconsole_socket_name); |
837 | return(0); | |
838 | } | |
839 | ||
840 | __initcall(mconsole_init); | |
841 | ||
842 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
843 | unsigned long count, void *data) | |
844 | { | |
845 | char *buf; | |
846 | ||
847 | buf = kmalloc(count + 1, GFP_KERNEL); | |
d50084a2 | 848 | if(buf == NULL) |
1da177e4 LT |
849 | return(-ENOMEM); |
850 | ||
851 | if(copy_from_user(buf, buffer, count)){ | |
852 | count = -EFAULT; | |
853 | goto out; | |
854 | } | |
855 | ||
856 | buf[count] = '\0'; | |
857 | ||
858 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
859 | out: | |
860 | kfree(buf); | |
861 | return(count); | |
862 | } | |
863 | ||
864 | static int create_proc_mconsole(void) | |
865 | { | |
866 | struct proc_dir_entry *ent; | |
867 | ||
868 | if(notify_socket == NULL) return(0); | |
869 | ||
870 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
871 | if(ent == NULL){ | |
30f417c6 | 872 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); |
1da177e4 LT |
873 | return(0); |
874 | } | |
875 | ||
876 | ent->read_proc = NULL; | |
877 | ent->write_proc = write_proc_mconsole; | |
878 | return(0); | |
879 | } | |
880 | ||
881 | static DEFINE_SPINLOCK(notify_spinlock); | |
882 | ||
883 | void lock_notify(void) | |
884 | { | |
885 | spin_lock(¬ify_spinlock); | |
886 | } | |
887 | ||
888 | void unlock_notify(void) | |
889 | { | |
890 | spin_unlock(¬ify_spinlock); | |
891 | } | |
892 | ||
893 | __initcall(create_proc_mconsole); | |
894 | ||
895 | #define NOTIFY "=notify:" | |
896 | ||
897 | static int mconsole_setup(char *str) | |
898 | { | |
899 | if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ | |
900 | str += strlen(NOTIFY); | |
901 | notify_socket = str; | |
902 | } | |
903 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
904 | return(1); | |
905 | } | |
906 | ||
907 | __setup("mconsole", mconsole_setup); | |
908 | ||
909 | __uml_help(mconsole_setup, | |
910 | "mconsole=notify:<socket>\n" | |
911 | " Requests that the mconsole driver send a message to the named Unix\n" | |
912 | " socket containing the name of the mconsole socket. This also serves\n" | |
913 | " to notify outside processes when UML has booted far enough to respond\n" | |
914 | " to mconsole requests.\n\n" | |
915 | ); | |
916 | ||
917 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
918 | void *ptr) | |
919 | { | |
920 | char *message = ptr; | |
921 | ||
922 | if(notify_socket == NULL) return(0); | |
923 | ||
d50084a2 | 924 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 LT |
925 | strlen(message) + 1); |
926 | return(0); | |
927 | } | |
928 | ||
929 | static struct notifier_block panic_exit_notifier = { | |
930 | .notifier_call = notify_panic, | |
931 | .next = NULL, | |
932 | .priority = 1 | |
933 | }; | |
934 | ||
935 | static int add_notifier(void) | |
936 | { | |
e041c683 AS |
937 | atomic_notifier_chain_register(&panic_notifier_list, |
938 | &panic_exit_notifier); | |
1da177e4 LT |
939 | return(0); |
940 | } | |
941 | ||
942 | __initcall(add_notifier); | |
943 | ||
944 | char *mconsole_notify_socket(void) | |
945 | { | |
946 | return(notify_socket); | |
947 | } | |
948 | ||
949 | EXPORT_SYMBOL(mconsole_notify_socket); |