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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) | |
827b3f6a | 3 | * Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
4 | * Licensed under the GPL |
5 | */ | |
6 | ||
827b3f6a JD |
7 | #include <linux/console.h> |
8 | #include <linux/ctype.h> | |
e7d2860b | 9 | #include <linux/string.h> |
827b3f6a JD |
10 | #include <linux/interrupt.h> |
11 | #include <linux/list.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/notifier.h> | |
15 | #include <linux/reboot.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/syscalls.h> | |
19 | #include <linux/utsname.h> | |
36137120 BS |
20 | #include <linux/socket.h> |
21 | #include <linux/un.h> | |
827b3f6a JD |
22 | #include <linux/workqueue.h> |
23 | #include <linux/mutex.h> | |
24 | #include <asm/uaccess.h> | |
25 | ||
ae2587e4 JD |
26 | #include "init.h" |
27 | #include "irq_kern.h" | |
28 | #include "irq_user.h" | |
1da177e4 | 29 | #include "kern_util.h" |
1da177e4 LT |
30 | #include "mconsole.h" |
31 | #include "mconsole_kern.h" | |
1da177e4 | 32 | #include "os.h" |
1da177e4 | 33 | |
d50084a2 | 34 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
35 | unsigned long what, void *data) |
36 | { | |
ae2587e4 | 37 | return mconsole_unlink_socket(); |
1da177e4 LT |
38 | } |
39 | ||
40 | ||
41 | static struct notifier_block reboot_notifier = { | |
42 | .notifier_call = do_unlink_socket, | |
43 | .priority = 0, | |
44 | }; | |
45 | ||
d50084a2 | 46 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
47 | * locking, and the interrupt handler is safe because it can't interrupt |
48 | * itself and it can only happen on CPU 0. | |
49 | */ | |
50 | ||
9010772c | 51 | static LIST_HEAD(mc_requests); |
1da177e4 | 52 | |
6d5aefb8 | 53 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
54 | { |
55 | struct mconsole_entry *req; | |
56 | unsigned long flags; | |
57 | ||
ae2587e4 | 58 | while (!list_empty(&mc_requests)) { |
dbdb4c06 | 59 | local_irq_save(flags); |
ae2587e4 | 60 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
1da177e4 LT |
61 | list_del(&req->list); |
62 | local_irq_restore(flags); | |
63 | req->request.cmd->handler(&req->request); | |
64 | kfree(req); | |
65 | } | |
66 | } | |
67 | ||
6d5aefb8 | 68 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 69 | |
7bea96fd | 70 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
71 | { |
72 | /* long to avoid size mismatch warnings from gcc */ | |
73 | long fd; | |
74 | struct mconsole_entry *new; | |
3a51237d | 75 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
76 | |
77 | fd = (long) dev_id; | |
ae2587e4 JD |
78 | while (mconsole_get_request(fd, &req)) { |
79 | if (req.cmd->context == MCONSOLE_INTR) | |
1da177e4 LT |
80 | (*req.cmd->handler)(&req); |
81 | else { | |
60baa158 | 82 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
ae2587e4 | 83 | if (new == NULL) |
1da177e4 LT |
84 | mconsole_reply(&req, "Out of memory", 1, 0); |
85 | else { | |
86 | new->request = req; | |
3a51237d | 87 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
88 | list_add(&new->list, &mc_requests); |
89 | } | |
90 | } | |
91 | } | |
ae2587e4 | 92 | if (!list_empty(&mc_requests)) |
1da177e4 LT |
93 | schedule_work(&mconsole_work); |
94 | reactivate_fd(fd, MCONSOLE_IRQ); | |
ae2587e4 | 95 | return IRQ_HANDLED; |
1da177e4 LT |
96 | } |
97 | ||
98 | void mconsole_version(struct mc_request *req) | |
99 | { | |
100 | char version[256]; | |
101 | ||
e9ff3990 | 102 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
ae2587e4 JD |
103 | utsname()->nodename, utsname()->release, utsname()->version, |
104 | utsname()->machine); | |
1da177e4 LT |
105 | mconsole_reply(req, version, 0, 0); |
106 | } | |
107 | ||
108 | void mconsole_log(struct mc_request *req) | |
109 | { | |
110 | int len; | |
111 | char *ptr = req->request.data; | |
112 | ||
113 | ptr += strlen("log "); | |
114 | ||
115 | len = req->len - (ptr - req->request.data); | |
ae2587e4 | 116 | printk(KERN_WARNING "%.*s", len, ptr); |
1da177e4 LT |
117 | mconsole_reply(req, "", 0, 0); |
118 | } | |
119 | ||
120 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
121 | * problems; however, we need it fixed, because it is expected that UML users | |
122 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
123 | * show the real procfs content, not the ones from hppfs.*/ | |
124 | #if 0 | |
125 | void mconsole_proc(struct mc_request *req) | |
126 | { | |
127 | struct nameidata nd; | |
128 | struct file_system_type *proc; | |
129 | struct super_block *super; | |
130 | struct file *file; | |
131 | int n, err; | |
132 | char *ptr = req->request.data, *buf; | |
133 | ||
134 | ptr += strlen("proc"); | |
e7d2860b | 135 | ptr = skip_spaces(ptr); |
1da177e4 LT |
136 | |
137 | proc = get_fs_type("proc"); | |
ae2587e4 | 138 | if (proc == NULL) { |
1da177e4 LT |
139 | mconsole_reply(req, "procfs not registered", 1, 0); |
140 | goto out; | |
141 | } | |
142 | ||
143 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
144 | put_filesystem(proc); | |
ae2587e4 | 145 | if (super == NULL) { |
1da177e4 LT |
146 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
147 | goto out; | |
148 | } | |
149 | up_write(&super->s_umount); | |
150 | ||
4ac91378 JB |
151 | nd.path.dentry = super->s_root; |
152 | nd.path.mnt = NULL; | |
1da177e4 LT |
153 | nd.flags = O_RDONLY + 1; |
154 | nd.last_type = LAST_ROOT; | |
155 | ||
156 | /* START: it was experienced that the stability problems are closed | |
157 | * if commenting out these two calls + the below read cycle. To | |
158 | * make UML crash again, it was enough to readd either one.*/ | |
159 | err = link_path_walk(ptr, &nd); | |
ae2587e4 | 160 | if (err) { |
1da177e4 LT |
161 | mconsole_reply(req, "Failed to look up file", 1, 0); |
162 | goto out_kill; | |
163 | } | |
164 | ||
745ca247 DH |
165 | file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY, |
166 | current_cred()); | |
ae2587e4 | 167 | if (IS_ERR(file)) { |
1da177e4 LT |
168 | mconsole_reply(req, "Failed to open file", 1, 0); |
169 | goto out_kill; | |
170 | } | |
171 | /*END*/ | |
172 | ||
173 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 174 | if (buf == NULL) { |
1da177e4 LT |
175 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
176 | goto out_fput; | |
177 | } | |
178 | ||
ae2587e4 | 179 | if ((file->f_op != NULL) && (file->f_op->read != NULL)) { |
1da177e4 LT |
180 | do { |
181 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
182 | &file->f_pos); | |
ae2587e4 | 183 | if (n >= 0) { |
1da177e4 LT |
184 | buf[n] = '\0'; |
185 | mconsole_reply(req, buf, 0, (n > 0)); | |
186 | } | |
187 | else { | |
188 | mconsole_reply(req, "Read of file failed", | |
189 | 1, 0); | |
190 | goto out_free; | |
191 | } | |
ae2587e4 | 192 | } while (n > 0); |
1da177e4 LT |
193 | } |
194 | else mconsole_reply(req, "", 0, 0); | |
195 | ||
196 | out_free: | |
197 | kfree(buf); | |
198 | out_fput: | |
199 | fput(file); | |
200 | out_kill: | |
201 | deactivate_super(super); | |
202 | out: ; | |
203 | } | |
204 | #endif | |
205 | ||
206 | void mconsole_proc(struct mc_request *req) | |
207 | { | |
208 | char path[64]; | |
209 | char *buf; | |
210 | int len; | |
211 | int fd; | |
212 | int first_chunk = 1; | |
213 | char *ptr = req->request.data; | |
214 | ||
215 | ptr += strlen("proc"); | |
e7d2860b | 216 | ptr = skip_spaces(ptr); |
1da177e4 LT |
217 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
218 | ||
219 | fd = sys_open(path, 0, 0); | |
220 | if (fd < 0) { | |
221 | mconsole_reply(req, "Failed to open file", 1, 0); | |
ae2587e4 | 222 | printk(KERN_ERR "open %s: %d\n",path,fd); |
1da177e4 LT |
223 | goto out; |
224 | } | |
225 | ||
226 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 227 | if (buf == NULL) { |
1da177e4 LT |
228 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
229 | goto out_close; | |
230 | } | |
231 | ||
232 | for (;;) { | |
233 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
234 | if (len < 0) { | |
235 | mconsole_reply(req, "Read of file failed", 1, 0); | |
236 | goto out_free; | |
237 | } | |
ae2587e4 | 238 | /* Begin the file content on his own line. */ |
1da177e4 LT |
239 | if (first_chunk) { |
240 | mconsole_reply(req, "\n", 0, 1); | |
241 | first_chunk = 0; | |
242 | } | |
243 | if (len == PAGE_SIZE-1) { | |
244 | buf[len] = '\0'; | |
245 | mconsole_reply(req, buf, 0, 1); | |
246 | } else { | |
247 | buf[len] = '\0'; | |
248 | mconsole_reply(req, buf, 0, 0); | |
249 | break; | |
250 | } | |
251 | } | |
252 | ||
253 | out_free: | |
254 | kfree(buf); | |
255 | out_close: | |
256 | sys_close(fd); | |
257 | out: | |
258 | /* nothing */; | |
259 | } | |
260 | ||
261 | #define UML_MCONSOLE_HELPTEXT \ | |
262 | "Commands: \n\ | |
263 | version - Get kernel version \n\ | |
264 | help - Print this message \n\ | |
265 | halt - Halt UML \n\ | |
266 | reboot - Reboot UML \n\ | |
267 | config <dev>=<config> - Add a new device to UML; \n\ | |
268 | same syntax as command line \n\ | |
269 | config <dev> - Query the configuration of a device \n\ | |
270 | remove <dev> - Remove a device from UML \n\ | |
271 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 272 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
273 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
274 | go - continue the UML after a 'stop' \n\ | |
275 | log <string> - make UML enter <string> into the kernel log\n\ | |
276 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 277 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
278 | " |
279 | ||
280 | void mconsole_help(struct mc_request *req) | |
281 | { | |
282 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
283 | } | |
284 | ||
285 | void mconsole_halt(struct mc_request *req) | |
286 | { | |
287 | mconsole_reply(req, "", 0, 0); | |
288 | machine_halt(); | |
289 | } | |
290 | ||
291 | void mconsole_reboot(struct mc_request *req) | |
292 | { | |
293 | mconsole_reply(req, "", 0, 0); | |
294 | machine_restart(NULL); | |
295 | } | |
296 | ||
1da177e4 LT |
297 | void mconsole_cad(struct mc_request *req) |
298 | { | |
299 | mconsole_reply(req, "", 0, 0); | |
300 | ctrl_alt_del(); | |
301 | } | |
302 | ||
303 | void mconsole_go(struct mc_request *req) | |
304 | { | |
305 | mconsole_reply(req, "Not stopped", 1, 0); | |
306 | } | |
307 | ||
308 | void mconsole_stop(struct mc_request *req) | |
309 | { | |
310 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
311 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d | 312 | mconsole_reply(req, "stopped", 0, 0); |
cc0be0fb KS |
313 | for (;;) { |
314 | if (!mconsole_get_request(req->originating_fd, req)) | |
315 | continue; | |
3a51237d AV |
316 | if (req->cmd->handler == mconsole_go) |
317 | break; | |
318 | if (req->cmd->handler == mconsole_stop) { | |
319 | mconsole_reply(req, "Already stopped", 1, 0); | |
320 | continue; | |
321 | } | |
322 | if (req->cmd->handler == mconsole_sysrq) { | |
323 | struct pt_regs *old_regs; | |
324 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
325 | mconsole_sysrq(req); | |
326 | set_irq_regs(old_regs); | |
327 | continue; | |
328 | } | |
1da177e4 LT |
329 | (*req->cmd->handler)(req); |
330 | } | |
331 | os_set_fd_block(req->originating_fd, 0); | |
332 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
333 | mconsole_reply(req, "", 0, 0); | |
334 | } | |
335 | ||
84f48d4f | 336 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 337 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
338 | |
339 | void mconsole_register_dev(struct mc_device *new) | |
340 | { | |
84f48d4f JD |
341 | spin_lock(&mc_devices_lock); |
342 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 343 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 344 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
345 | } |
346 | ||
347 | static struct mc_device *mconsole_find_dev(char *name) | |
348 | { | |
349 | struct list_head *ele; | |
350 | struct mc_device *dev; | |
351 | ||
ae2587e4 | 352 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 353 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
354 | if (!strncmp(name, dev->name, strlen(dev->name))) |
355 | return dev; | |
1da177e4 | 356 | } |
ae2587e4 | 357 | return NULL; |
1da177e4 LT |
358 | } |
359 | ||
02dea087 JD |
360 | #define UNPLUGGED_PER_PAGE \ |
361 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
362 | ||
363 | struct unplugged_pages { | |
364 | struct list_head list; | |
365 | void *pages[UNPLUGGED_PER_PAGE]; | |
366 | }; | |
367 | ||
e98fa281 | 368 | static DEFINE_MUTEX(plug_mem_mutex); |
02dea087 | 369 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 370 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
371 | static int unplug_index = UNPLUGGED_PER_PAGE; |
372 | ||
f28169d2 | 373 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
374 | { |
375 | unsigned long long diff; | |
376 | int err = -EINVAL, i, add; | |
377 | char *ret; | |
378 | ||
ae2587e4 | 379 | if (str[0] != '=') { |
f28169d2 | 380 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 381 | goto out; |
f28169d2 | 382 | } |
02dea087 JD |
383 | |
384 | str++; | |
ae2587e4 | 385 | if (str[0] == '-') |
02dea087 | 386 | add = 0; |
ae2587e4 | 387 | else if (str[0] == '+') { |
02dea087 JD |
388 | add = 1; |
389 | } | |
f28169d2 JD |
390 | else { |
391 | *error_out = "Expected increment to start with '-' or '+'"; | |
392 | goto out; | |
393 | } | |
02dea087 JD |
394 | |
395 | str++; | |
396 | diff = memparse(str, &ret); | |
ae2587e4 | 397 | if (*ret != '\0') { |
f28169d2 | 398 | *error_out = "Failed to parse memory increment"; |
02dea087 | 399 | goto out; |
f28169d2 | 400 | } |
02dea087 JD |
401 | |
402 | diff /= PAGE_SIZE; | |
403 | ||
e98fa281 | 404 | mutex_lock(&plug_mem_mutex); |
ae2587e4 | 405 | for (i = 0; i < diff; i++) { |
02dea087 JD |
406 | struct unplugged_pages *unplugged; |
407 | void *addr; | |
408 | ||
ae2587e4 JD |
409 | if (add) { |
410 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
411 | break; |
412 | ||
413 | unplugged = list_entry(unplugged_pages.next, | |
414 | struct unplugged_pages, list); | |
ae2587e4 | 415 | if (unplug_index > 0) |
02dea087 JD |
416 | addr = unplugged->pages[--unplug_index]; |
417 | else { | |
418 | list_del(&unplugged->list); | |
419 | addr = unplugged; | |
420 | unplug_index = UNPLUGGED_PER_PAGE; | |
421 | } | |
422 | ||
423 | free_page((unsigned long) addr); | |
424 | unplugged_pages_count--; | |
425 | } | |
426 | else { | |
427 | struct page *page; | |
428 | ||
429 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 430 | if (page == NULL) |
02dea087 JD |
431 | break; |
432 | ||
433 | unplugged = page_address(page); | |
ae2587e4 | 434 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
435 | list_add(&unplugged->list, &unplugged_pages); |
436 | unplug_index = 0; | |
437 | } | |
438 | else { | |
439 | struct list_head *entry = unplugged_pages.next; | |
440 | addr = unplugged; | |
441 | ||
442 | unplugged = list_entry(entry, | |
443 | struct unplugged_pages, | |
444 | list); | |
02dea087 | 445 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
446 | if (err) { |
447 | printk(KERN_ERR "Failed to release " | |
448 | "memory - errno = %d\n", err); | |
f28169d2 | 449 | *error_out = "Failed to release memory"; |
84f48d4f | 450 | goto out_unlock; |
f28169d2 JD |
451 | } |
452 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
453 | } |
454 | ||
455 | unplugged_pages_count++; | |
456 | } | |
457 | } | |
458 | ||
459 | err = 0; | |
84f48d4f | 460 | out_unlock: |
e98fa281 | 461 | mutex_unlock(&plug_mem_mutex); |
02dea087 JD |
462 | out: |
463 | return err; | |
464 | } | |
465 | ||
466 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
467 | { | |
468 | char buf[sizeof("18446744073709551615")]; | |
469 | int len = 0; | |
470 | ||
471 | sprintf(buf, "%ld", uml_physmem); | |
472 | CONFIG_CHUNK(str, size, len, buf, 1); | |
473 | ||
474 | return len; | |
475 | } | |
476 | ||
477 | static int mem_id(char **str, int *start_out, int *end_out) | |
478 | { | |
479 | *start_out = 0; | |
480 | *end_out = 0; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
f28169d2 | 485 | static int mem_remove(int n, char **error_out) |
02dea087 | 486 | { |
f28169d2 | 487 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
488 | return -EBUSY; |
489 | } | |
490 | ||
491 | static struct mc_device mem_mc = { | |
84f48d4f | 492 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
493 | .name = "mem", |
494 | .config = mem_config, | |
495 | .get_config = mem_get_config, | |
496 | .id = mem_id, | |
497 | .remove = mem_remove, | |
498 | }; | |
499 | ||
97a1fcbb | 500 | static int __init mem_mc_init(void) |
02dea087 | 501 | { |
ae2587e4 | 502 | if (can_drop_memory()) |
02dea087 | 503 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
504 | else printk(KERN_ERR "Can't release memory to the host - memory " |
505 | "hotplug won't be supported\n"); | |
02dea087 JD |
506 | return 0; |
507 | } | |
508 | ||
509 | __initcall(mem_mc_init); | |
510 | ||
1da177e4 LT |
511 | #define CONFIG_BUF_SIZE 64 |
512 | ||
d50084a2 | 513 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
514 | char **), |
515 | struct mc_request *req, char *name) | |
516 | { | |
517 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
518 | int n, size; | |
519 | ||
ae2587e4 | 520 | if (get_config == NULL) { |
1da177e4 LT |
521 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
522 | return; | |
523 | } | |
524 | ||
525 | error = NULL; | |
91b165c0 | 526 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
527 | buf = default_buf; |
528 | ||
ae2587e4 | 529 | while (1) { |
1da177e4 | 530 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 531 | if (error != NULL) { |
1da177e4 LT |
532 | mconsole_reply(req, error, 1, 0); |
533 | goto out; | |
534 | } | |
535 | ||
ae2587e4 | 536 | if (n <= size) { |
1da177e4 LT |
537 | mconsole_reply(req, buf, 0, 0); |
538 | goto out; | |
539 | } | |
540 | ||
ae2587e4 | 541 | if (buf != default_buf) |
1da177e4 LT |
542 | kfree(buf); |
543 | ||
544 | size = n; | |
545 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 546 | if (buf == NULL) { |
1da177e4 LT |
547 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
548 | return; | |
549 | } | |
550 | } | |
551 | out: | |
ae2587e4 | 552 | if (buf != default_buf) |
1da177e4 | 553 | kfree(buf); |
1da177e4 LT |
554 | } |
555 | ||
556 | void mconsole_config(struct mc_request *req) | |
557 | { | |
558 | struct mc_device *dev; | |
f28169d2 | 559 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
560 | int err; |
561 | ||
562 | ptr += strlen("config"); | |
e7d2860b | 563 | ptr = skip_spaces(ptr); |
1da177e4 | 564 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 565 | if (dev == NULL) { |
1da177e4 LT |
566 | mconsole_reply(req, "Bad configuration option", 1, 0); |
567 | return; | |
568 | } | |
569 | ||
570 | name = &ptr[strlen(dev->name)]; | |
571 | ptr = name; | |
ae2587e4 | 572 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
573 | ptr++; |
574 | ||
ae2587e4 | 575 | if (*ptr == '=') { |
f28169d2 JD |
576 | err = (*dev->config)(name, &error_string); |
577 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
578 | } |
579 | else mconsole_get_config(dev->get_config, req, name); | |
580 | } | |
581 | ||
582 | void mconsole_remove(struct mc_request *req) | |
583 | { | |
d50084a2 | 584 | struct mc_device *dev; |
29d56cfe | 585 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 586 | char error[256]; |
29d56cfe | 587 | int err, start, end, n; |
1da177e4 LT |
588 | |
589 | ptr += strlen("remove"); | |
e7d2860b | 590 | ptr = skip_spaces(ptr); |
1da177e4 | 591 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 592 | if (dev == NULL) { |
1da177e4 LT |
593 | mconsole_reply(req, "Bad remove option", 1, 0); |
594 | return; | |
595 | } | |
29d56cfe | 596 | |
3a331a51 JD |
597 | ptr = &ptr[strlen(dev->name)]; |
598 | ||
599 | err = 1; | |
600 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 601 | if (n < 0) { |
3a331a51 JD |
602 | err_msg = "Couldn't parse device number"; |
603 | goto out; | |
604 | } | |
ae2587e4 | 605 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
606 | sprintf(error, "Invalid device number - must be between " |
607 | "%d and %d", start, end); | |
608 | err_msg = error; | |
609 | goto out; | |
610 | } | |
29d56cfe | 611 | |
f28169d2 JD |
612 | err_msg = NULL; |
613 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 614 | switch(err) { |
d40f6d71 JD |
615 | case 0: |
616 | err_msg = ""; | |
617 | break; | |
3a331a51 | 618 | case -ENODEV: |
ae2587e4 | 619 | if (err_msg == NULL) |
f28169d2 | 620 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
621 | break; |
622 | case -EBUSY: | |
ae2587e4 | 623 | if (err_msg == NULL) |
f28169d2 | 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]; | |
6f517d3f JD |
641 | |
642 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 643 | unsigned int len) |
6f517d3f JD |
644 | { |
645 | struct list_head *ele; | |
646 | int n; | |
647 | ||
ae2587e4 | 648 | if (list_empty(&clients)) |
6f517d3f JD |
649 | return; |
650 | ||
54fa0ba4 JD |
651 | while (len > 0) { |
652 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
653 | strncpy(console_buf, string, n); | |
6f517d3f JD |
654 | string += n; |
655 | len -= n; | |
6f517d3f | 656 | |
ae2587e4 | 657 | list_for_each(ele, &clients) { |
f92afe56 | 658 | struct mconsole_output *entry; |
6f517d3f | 659 | |
f92afe56 | 660 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 661 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 662 | } |
6f517d3f JD |
663 | } |
664 | } | |
665 | ||
666 | static struct console mc_console = { .name = "mc", | |
667 | .write = console_write, | |
a174b30e | 668 | .flags = CON_ENABLED, |
6f517d3f JD |
669 | .index = -1 }; |
670 | ||
671 | static int mc_add_console(void) | |
672 | { | |
673 | register_console(&mc_console); | |
674 | return 0; | |
675 | } | |
676 | ||
677 | late_initcall(mc_add_console); | |
678 | ||
679 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
680 | void *arg) | |
681 | { | |
f92afe56 | 682 | struct mconsole_output entry; |
6f517d3f JD |
683 | unsigned long flags; |
684 | ||
f92afe56 | 685 | entry.req = req; |
84f48d4f | 686 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 687 | list_add(&entry.list, &clients); |
84f48d4f | 688 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
689 | |
690 | (*proc)(arg); | |
691 | ||
54fa0ba4 | 692 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 693 | |
84f48d4f | 694 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 695 | list_del(&entry.list); |
84f48d4f | 696 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
697 | } |
698 | ||
4111b025 | 699 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
700 | |
701 | #include <linux/sysrq.h> | |
702 | ||
4111b025 JD |
703 | static void sysrq_proc(void *arg) |
704 | { | |
705 | char *op = arg; | |
7bea96fd | 706 | handle_sysrq(*op, NULL); |
4111b025 JD |
707 | } |
708 | ||
709 | void mconsole_sysrq(struct mc_request *req) | |
710 | { | |
711 | char *ptr = req->request.data; | |
712 | ||
713 | ptr += strlen("sysrq"); | |
e7d2860b | 714 | ptr = skip_spaces(ptr); |
4111b025 | 715 | |
ae2587e4 JD |
716 | /* |
717 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
718 | * so in this case, we reply first. |
719 | */ | |
ae2587e4 | 720 | if (*ptr == 'b') |
4111b025 JD |
721 | mconsole_reply(req, "", 0, 0); |
722 | ||
723 | with_console(req, sysrq_proc, ptr); | |
724 | } | |
725 | #else | |
726 | void mconsole_sysrq(struct mc_request *req) | |
727 | { | |
728 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
729 | } | |
730 | #endif | |
731 | ||
6f517d3f JD |
732 | static void stack_proc(void *arg) |
733 | { | |
734 | struct task_struct *from = current, *to = arg; | |
735 | ||
736 | to->thread.saved_task = from; | |
737 | switch_to(from, to, from); | |
738 | } | |
739 | ||
ae2587e4 JD |
740 | /* |
741 | * Mconsole stack trace | |
3eddddcf JD |
742 | * Added by Allan Graves, Jeff Dike |
743 | * Dumps a stacks registers to the linux console. | |
744 | * Usage stack <pid>. | |
745 | */ | |
42fda663 | 746 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 747 | { |
3a331a51 JD |
748 | char *ptr = req->request.data; |
749 | int pid_requested= -1; | |
3eddddcf JD |
750 | struct task_struct *to = NULL; |
751 | ||
ae2587e4 JD |
752 | /* |
753 | * Would be nice: | |
3a331a51 | 754 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
755 | * 2) Add a way to stack dump all pids. |
756 | */ | |
757 | ||
3a331a51 | 758 | ptr += strlen("stack"); |
e7d2860b | 759 | ptr = skip_spaces(ptr); |
3eddddcf | 760 | |
ae2587e4 JD |
761 | /* |
762 | * Should really check for multiple pids or reject bad args here | |
763 | */ | |
3a331a51 | 764 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 765 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
766 | mconsole_reply(req, "Please specify a pid", 1, 0); |
767 | return; | |
768 | } | |
3eddddcf | 769 | |
827b3f6a | 770 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
ae2587e4 | 771 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
772 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
773 | return; | |
774 | } | |
6f517d3f | 775 | with_console(req, stack_proc, to); |
3eddddcf | 776 | } |
3eddddcf | 777 | |
ae2587e4 JD |
778 | /* |
779 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
780 | * active. |
781 | */ | |
d50084a2 | 782 | static char *notify_socket = NULL; |
1da177e4 | 783 | |
97a1fcbb | 784 | static int __init mconsole_init(void) |
1da177e4 LT |
785 | { |
786 | /* long to avoid size mismatch warnings from gcc */ | |
787 | long sock; | |
788 | int err; | |
36137120 | 789 | char file[UNIX_PATH_MAX]; |
1da177e4 | 790 | |
ae2587e4 JD |
791 | if (umid_file_name("mconsole", file, sizeof(file))) |
792 | return -1; | |
1da177e4 LT |
793 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
794 | ||
795 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
796 | if (sock < 0) { |
797 | printk(KERN_ERR "Failed to initialize management console\n"); | |
798 | return 1; | |
1da177e4 | 799 | } |
438ee679 JD |
800 | if (os_set_fd_block(sock, 0)) |
801 | goto out; | |
1da177e4 LT |
802 | |
803 | register_reboot_notifier(&reboot_notifier); | |
804 | ||
805 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 806 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 807 | "mconsole", (void *)sock); |
ae2587e4 JD |
808 | if (err) { |
809 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 810 | goto out; |
1da177e4 LT |
811 | } |
812 | ||
ae2587e4 | 813 | if (notify_socket != NULL) { |
970d6e3a | 814 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 815 | if (notify_socket != NULL) |
1da177e4 | 816 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 817 | mconsole_socket_name, |
1da177e4 LT |
818 | strlen(mconsole_socket_name) + 1); |
819 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
820 | "string\n"); | |
821 | } | |
822 | ||
ae2587e4 | 823 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 824 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 825 | return 0; |
438ee679 JD |
826 | |
827 | out: | |
828 | os_close_file(sock); | |
829 | return 1; | |
1da177e4 LT |
830 | } |
831 | ||
832 | __initcall(mconsole_init); | |
833 | ||
6613c5e8 AD |
834 | static ssize_t mconsole_proc_write(struct file *file, |
835 | const char __user *buffer, size_t count, loff_t *pos) | |
1da177e4 LT |
836 | { |
837 | char *buf; | |
838 | ||
839 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
840 | if (buf == NULL) |
841 | return -ENOMEM; | |
1da177e4 | 842 | |
ae2587e4 | 843 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
844 | count = -EFAULT; |
845 | goto out; | |
846 | } | |
847 | ||
848 | buf[count] = '\0'; | |
849 | ||
850 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
851 | out: | |
852 | kfree(buf); | |
ae2587e4 | 853 | return count; |
1da177e4 LT |
854 | } |
855 | ||
6613c5e8 AD |
856 | static const struct file_operations mconsole_proc_fops = { |
857 | .owner = THIS_MODULE, | |
858 | .write = mconsole_proc_write, | |
859 | }; | |
860 | ||
1da177e4 LT |
861 | static int create_proc_mconsole(void) |
862 | { | |
863 | struct proc_dir_entry *ent; | |
864 | ||
ae2587e4 JD |
865 | if (notify_socket == NULL) |
866 | return 0; | |
1da177e4 | 867 | |
6613c5e8 | 868 | ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops); |
ae2587e4 JD |
869 | if (ent == NULL) { |
870 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
871 | "failed\n"); | |
872 | return 0; | |
1da177e4 | 873 | } |
ae2587e4 | 874 | return 0; |
1da177e4 LT |
875 | } |
876 | ||
877 | static DEFINE_SPINLOCK(notify_spinlock); | |
878 | ||
879 | void lock_notify(void) | |
880 | { | |
881 | spin_lock(¬ify_spinlock); | |
882 | } | |
883 | ||
884 | void unlock_notify(void) | |
885 | { | |
886 | spin_unlock(¬ify_spinlock); | |
887 | } | |
888 | ||
889 | __initcall(create_proc_mconsole); | |
890 | ||
088bec41 | 891 | #define NOTIFY "notify:" |
1da177e4 LT |
892 | |
893 | static int mconsole_setup(char *str) | |
894 | { | |
ae2587e4 | 895 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
896 | str += strlen(NOTIFY); |
897 | notify_socket = str; | |
898 | } | |
899 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 900 | return 1; |
1da177e4 LT |
901 | } |
902 | ||
088bec41 | 903 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
904 | |
905 | __uml_help(mconsole_setup, | |
906 | "mconsole=notify:<socket>\n" | |
907 | " Requests that the mconsole driver send a message to the named Unix\n" | |
908 | " socket containing the name of the mconsole socket. This also serves\n" | |
909 | " to notify outside processes when UML has booted far enough to respond\n" | |
910 | " to mconsole requests.\n\n" | |
911 | ); | |
912 | ||
913 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
914 | void *ptr) | |
915 | { | |
916 | char *message = ptr; | |
917 | ||
ae2587e4 JD |
918 | if (notify_socket == NULL) |
919 | return 0; | |
1da177e4 | 920 | |
d50084a2 | 921 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 922 | strlen(message) + 1); |
ae2587e4 | 923 | return 0; |
1da177e4 LT |
924 | } |
925 | ||
926 | static struct notifier_block panic_exit_notifier = { | |
927 | .notifier_call = notify_panic, | |
928 | .next = NULL, | |
929 | .priority = 1 | |
930 | }; | |
931 | ||
932 | static int add_notifier(void) | |
933 | { | |
e041c683 AS |
934 | atomic_notifier_chain_register(&panic_notifier_list, |
935 | &panic_exit_notifier); | |
ae2587e4 | 936 | return 0; |
1da177e4 LT |
937 | } |
938 | ||
939 | __initcall(add_notifier); | |
940 | ||
941 | char *mconsole_notify_socket(void) | |
942 | { | |
ae2587e4 | 943 | return notify_socket; |
1da177e4 LT |
944 | } |
945 | ||
946 | EXPORT_SYMBOL(mconsole_notify_socket); |