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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 | { | |
4ecf09fd | 127 | struct vfsmount *mnt = current->nsproxy->pid_ns->proc_mnt; |
1da177e4 | 128 | struct file *file; |
73d049a4 | 129 | int n; |
1da177e4 | 130 | char *ptr = req->request.data, *buf; |
4ecf09fd | 131 | mm_segment_t old_fs = get_fs(); |
1da177e4 LT |
132 | |
133 | ptr += strlen("proc"); | |
e7d2860b | 134 | ptr = skip_spaces(ptr); |
1da177e4 | 135 | |
73d049a4 | 136 | file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY); |
ae2587e4 | 137 | if (IS_ERR(file)) { |
1da177e4 | 138 | mconsole_reply(req, "Failed to open file", 1, 0); |
4ecf09fd | 139 | goto out; |
1da177e4 | 140 | } |
1da177e4 LT |
141 | |
142 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 143 | if (buf == NULL) { |
1da177e4 LT |
144 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
145 | goto out_fput; | |
146 | } | |
147 | ||
4ecf09fd | 148 | if (file->f_op->read) { |
1da177e4 | 149 | do { |
4ecf09fd AV |
150 | loff_t pos; |
151 | set_fs(KERNEL_DS); | |
152 | n = vfs_read(file, buf, PAGE_SIZE - 1, &pos); | |
153 | file_pos_write(file, pos); | |
154 | set_fs(old_fs); | |
ae2587e4 | 155 | if (n >= 0) { |
1da177e4 LT |
156 | buf[n] = '\0'; |
157 | mconsole_reply(req, buf, 0, (n > 0)); | |
158 | } | |
159 | else { | |
160 | mconsole_reply(req, "Read of file failed", | |
161 | 1, 0); | |
162 | goto out_free; | |
163 | } | |
ae2587e4 | 164 | } while (n > 0); |
1da177e4 LT |
165 | } |
166 | else mconsole_reply(req, "", 0, 0); | |
167 | ||
168 | out_free: | |
169 | kfree(buf); | |
170 | out_fput: | |
171 | fput(file); | |
1da177e4 LT |
172 | out: ; |
173 | } | |
174 | #endif | |
175 | ||
176 | void mconsole_proc(struct mc_request *req) | |
177 | { | |
178 | char path[64]; | |
179 | char *buf; | |
180 | int len; | |
181 | int fd; | |
182 | int first_chunk = 1; | |
183 | char *ptr = req->request.data; | |
184 | ||
185 | ptr += strlen("proc"); | |
e7d2860b | 186 | ptr = skip_spaces(ptr); |
1da177e4 LT |
187 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
188 | ||
189 | fd = sys_open(path, 0, 0); | |
190 | if (fd < 0) { | |
191 | mconsole_reply(req, "Failed to open file", 1, 0); | |
ae2587e4 | 192 | printk(KERN_ERR "open %s: %d\n",path,fd); |
1da177e4 LT |
193 | goto out; |
194 | } | |
195 | ||
196 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 197 | if (buf == NULL) { |
1da177e4 LT |
198 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
199 | goto out_close; | |
200 | } | |
201 | ||
202 | for (;;) { | |
203 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
204 | if (len < 0) { | |
205 | mconsole_reply(req, "Read of file failed", 1, 0); | |
206 | goto out_free; | |
207 | } | |
ae2587e4 | 208 | /* Begin the file content on his own line. */ |
1da177e4 LT |
209 | if (first_chunk) { |
210 | mconsole_reply(req, "\n", 0, 1); | |
211 | first_chunk = 0; | |
212 | } | |
213 | if (len == PAGE_SIZE-1) { | |
214 | buf[len] = '\0'; | |
215 | mconsole_reply(req, buf, 0, 1); | |
216 | } else { | |
217 | buf[len] = '\0'; | |
218 | mconsole_reply(req, buf, 0, 0); | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
223 | out_free: | |
224 | kfree(buf); | |
225 | out_close: | |
226 | sys_close(fd); | |
227 | out: | |
228 | /* nothing */; | |
229 | } | |
230 | ||
231 | #define UML_MCONSOLE_HELPTEXT \ | |
232 | "Commands: \n\ | |
233 | version - Get kernel version \n\ | |
234 | help - Print this message \n\ | |
235 | halt - Halt UML \n\ | |
236 | reboot - Reboot UML \n\ | |
237 | config <dev>=<config> - Add a new device to UML; \n\ | |
238 | same syntax as command line \n\ | |
239 | config <dev> - Query the configuration of a device \n\ | |
240 | remove <dev> - Remove a device from UML \n\ | |
241 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 242 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
243 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
244 | go - continue the UML after a 'stop' \n\ | |
245 | log <string> - make UML enter <string> into the kernel log\n\ | |
246 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 247 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
248 | " |
249 | ||
250 | void mconsole_help(struct mc_request *req) | |
251 | { | |
252 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
253 | } | |
254 | ||
255 | void mconsole_halt(struct mc_request *req) | |
256 | { | |
257 | mconsole_reply(req, "", 0, 0); | |
258 | machine_halt(); | |
259 | } | |
260 | ||
261 | void mconsole_reboot(struct mc_request *req) | |
262 | { | |
263 | mconsole_reply(req, "", 0, 0); | |
264 | machine_restart(NULL); | |
265 | } | |
266 | ||
1da177e4 LT |
267 | void mconsole_cad(struct mc_request *req) |
268 | { | |
269 | mconsole_reply(req, "", 0, 0); | |
270 | ctrl_alt_del(); | |
271 | } | |
272 | ||
273 | void mconsole_go(struct mc_request *req) | |
274 | { | |
275 | mconsole_reply(req, "Not stopped", 1, 0); | |
276 | } | |
277 | ||
278 | void mconsole_stop(struct mc_request *req) | |
279 | { | |
280 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
281 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d | 282 | mconsole_reply(req, "stopped", 0, 0); |
cc0be0fb KS |
283 | for (;;) { |
284 | if (!mconsole_get_request(req->originating_fd, req)) | |
285 | continue; | |
3a51237d AV |
286 | if (req->cmd->handler == mconsole_go) |
287 | break; | |
288 | if (req->cmd->handler == mconsole_stop) { | |
289 | mconsole_reply(req, "Already stopped", 1, 0); | |
290 | continue; | |
291 | } | |
292 | if (req->cmd->handler == mconsole_sysrq) { | |
293 | struct pt_regs *old_regs; | |
294 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
295 | mconsole_sysrq(req); | |
296 | set_irq_regs(old_regs); | |
297 | continue; | |
298 | } | |
1da177e4 LT |
299 | (*req->cmd->handler)(req); |
300 | } | |
301 | os_set_fd_block(req->originating_fd, 0); | |
302 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
303 | mconsole_reply(req, "", 0, 0); | |
304 | } | |
305 | ||
84f48d4f | 306 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 307 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
308 | |
309 | void mconsole_register_dev(struct mc_device *new) | |
310 | { | |
84f48d4f JD |
311 | spin_lock(&mc_devices_lock); |
312 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 313 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 314 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
315 | } |
316 | ||
317 | static struct mc_device *mconsole_find_dev(char *name) | |
318 | { | |
319 | struct list_head *ele; | |
320 | struct mc_device *dev; | |
321 | ||
ae2587e4 | 322 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 323 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
324 | if (!strncmp(name, dev->name, strlen(dev->name))) |
325 | return dev; | |
1da177e4 | 326 | } |
ae2587e4 | 327 | return NULL; |
1da177e4 LT |
328 | } |
329 | ||
02dea087 JD |
330 | #define UNPLUGGED_PER_PAGE \ |
331 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
332 | ||
333 | struct unplugged_pages { | |
334 | struct list_head list; | |
335 | void *pages[UNPLUGGED_PER_PAGE]; | |
336 | }; | |
337 | ||
e98fa281 | 338 | static DEFINE_MUTEX(plug_mem_mutex); |
02dea087 | 339 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 340 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
341 | static int unplug_index = UNPLUGGED_PER_PAGE; |
342 | ||
f28169d2 | 343 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
344 | { |
345 | unsigned long long diff; | |
346 | int err = -EINVAL, i, add; | |
347 | char *ret; | |
348 | ||
ae2587e4 | 349 | if (str[0] != '=') { |
f28169d2 | 350 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 351 | goto out; |
f28169d2 | 352 | } |
02dea087 JD |
353 | |
354 | str++; | |
ae2587e4 | 355 | if (str[0] == '-') |
02dea087 | 356 | add = 0; |
ae2587e4 | 357 | else if (str[0] == '+') { |
02dea087 JD |
358 | add = 1; |
359 | } | |
f28169d2 JD |
360 | else { |
361 | *error_out = "Expected increment to start with '-' or '+'"; | |
362 | goto out; | |
363 | } | |
02dea087 JD |
364 | |
365 | str++; | |
366 | diff = memparse(str, &ret); | |
ae2587e4 | 367 | if (*ret != '\0') { |
f28169d2 | 368 | *error_out = "Failed to parse memory increment"; |
02dea087 | 369 | goto out; |
f28169d2 | 370 | } |
02dea087 JD |
371 | |
372 | diff /= PAGE_SIZE; | |
373 | ||
e98fa281 | 374 | mutex_lock(&plug_mem_mutex); |
ae2587e4 | 375 | for (i = 0; i < diff; i++) { |
02dea087 JD |
376 | struct unplugged_pages *unplugged; |
377 | void *addr; | |
378 | ||
ae2587e4 JD |
379 | if (add) { |
380 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
381 | break; |
382 | ||
383 | unplugged = list_entry(unplugged_pages.next, | |
384 | struct unplugged_pages, list); | |
ae2587e4 | 385 | if (unplug_index > 0) |
02dea087 JD |
386 | addr = unplugged->pages[--unplug_index]; |
387 | else { | |
388 | list_del(&unplugged->list); | |
389 | addr = unplugged; | |
390 | unplug_index = UNPLUGGED_PER_PAGE; | |
391 | } | |
392 | ||
393 | free_page((unsigned long) addr); | |
394 | unplugged_pages_count--; | |
395 | } | |
396 | else { | |
397 | struct page *page; | |
398 | ||
399 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 400 | if (page == NULL) |
02dea087 JD |
401 | break; |
402 | ||
403 | unplugged = page_address(page); | |
ae2587e4 | 404 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
405 | list_add(&unplugged->list, &unplugged_pages); |
406 | unplug_index = 0; | |
407 | } | |
408 | else { | |
409 | struct list_head *entry = unplugged_pages.next; | |
410 | addr = unplugged; | |
411 | ||
412 | unplugged = list_entry(entry, | |
413 | struct unplugged_pages, | |
414 | list); | |
02dea087 | 415 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
416 | if (err) { |
417 | printk(KERN_ERR "Failed to release " | |
418 | "memory - errno = %d\n", err); | |
f28169d2 | 419 | *error_out = "Failed to release memory"; |
84f48d4f | 420 | goto out_unlock; |
f28169d2 JD |
421 | } |
422 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
423 | } |
424 | ||
425 | unplugged_pages_count++; | |
426 | } | |
427 | } | |
428 | ||
429 | err = 0; | |
84f48d4f | 430 | out_unlock: |
e98fa281 | 431 | mutex_unlock(&plug_mem_mutex); |
02dea087 JD |
432 | out: |
433 | return err; | |
434 | } | |
435 | ||
436 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
437 | { | |
438 | char buf[sizeof("18446744073709551615")]; | |
439 | int len = 0; | |
440 | ||
441 | sprintf(buf, "%ld", uml_physmem); | |
442 | CONFIG_CHUNK(str, size, len, buf, 1); | |
443 | ||
444 | return len; | |
445 | } | |
446 | ||
447 | static int mem_id(char **str, int *start_out, int *end_out) | |
448 | { | |
449 | *start_out = 0; | |
450 | *end_out = 0; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
f28169d2 | 455 | static int mem_remove(int n, char **error_out) |
02dea087 | 456 | { |
f28169d2 | 457 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
458 | return -EBUSY; |
459 | } | |
460 | ||
461 | static struct mc_device mem_mc = { | |
84f48d4f | 462 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
463 | .name = "mem", |
464 | .config = mem_config, | |
465 | .get_config = mem_get_config, | |
466 | .id = mem_id, | |
467 | .remove = mem_remove, | |
468 | }; | |
469 | ||
97a1fcbb | 470 | static int __init mem_mc_init(void) |
02dea087 | 471 | { |
ae2587e4 | 472 | if (can_drop_memory()) |
02dea087 | 473 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
474 | else printk(KERN_ERR "Can't release memory to the host - memory " |
475 | "hotplug won't be supported\n"); | |
02dea087 JD |
476 | return 0; |
477 | } | |
478 | ||
479 | __initcall(mem_mc_init); | |
480 | ||
1da177e4 LT |
481 | #define CONFIG_BUF_SIZE 64 |
482 | ||
d50084a2 | 483 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
484 | char **), |
485 | struct mc_request *req, char *name) | |
486 | { | |
487 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
488 | int n, size; | |
489 | ||
ae2587e4 | 490 | if (get_config == NULL) { |
1da177e4 LT |
491 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
492 | return; | |
493 | } | |
494 | ||
495 | error = NULL; | |
91b165c0 | 496 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
497 | buf = default_buf; |
498 | ||
ae2587e4 | 499 | while (1) { |
1da177e4 | 500 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 501 | if (error != NULL) { |
1da177e4 LT |
502 | mconsole_reply(req, error, 1, 0); |
503 | goto out; | |
504 | } | |
505 | ||
ae2587e4 | 506 | if (n <= size) { |
1da177e4 LT |
507 | mconsole_reply(req, buf, 0, 0); |
508 | goto out; | |
509 | } | |
510 | ||
ae2587e4 | 511 | if (buf != default_buf) |
1da177e4 LT |
512 | kfree(buf); |
513 | ||
514 | size = n; | |
515 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 516 | if (buf == NULL) { |
1da177e4 LT |
517 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
518 | return; | |
519 | } | |
520 | } | |
521 | out: | |
ae2587e4 | 522 | if (buf != default_buf) |
1da177e4 | 523 | kfree(buf); |
1da177e4 LT |
524 | } |
525 | ||
526 | void mconsole_config(struct mc_request *req) | |
527 | { | |
528 | struct mc_device *dev; | |
f28169d2 | 529 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
530 | int err; |
531 | ||
532 | ptr += strlen("config"); | |
e7d2860b | 533 | ptr = skip_spaces(ptr); |
1da177e4 | 534 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 535 | if (dev == NULL) { |
1da177e4 LT |
536 | mconsole_reply(req, "Bad configuration option", 1, 0); |
537 | return; | |
538 | } | |
539 | ||
540 | name = &ptr[strlen(dev->name)]; | |
541 | ptr = name; | |
ae2587e4 | 542 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
543 | ptr++; |
544 | ||
ae2587e4 | 545 | if (*ptr == '=') { |
f28169d2 JD |
546 | err = (*dev->config)(name, &error_string); |
547 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
548 | } |
549 | else mconsole_get_config(dev->get_config, req, name); | |
550 | } | |
551 | ||
552 | void mconsole_remove(struct mc_request *req) | |
553 | { | |
d50084a2 | 554 | struct mc_device *dev; |
29d56cfe | 555 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 556 | char error[256]; |
29d56cfe | 557 | int err, start, end, n; |
1da177e4 LT |
558 | |
559 | ptr += strlen("remove"); | |
e7d2860b | 560 | ptr = skip_spaces(ptr); |
1da177e4 | 561 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 562 | if (dev == NULL) { |
1da177e4 LT |
563 | mconsole_reply(req, "Bad remove option", 1, 0); |
564 | return; | |
565 | } | |
29d56cfe | 566 | |
3a331a51 JD |
567 | ptr = &ptr[strlen(dev->name)]; |
568 | ||
569 | err = 1; | |
570 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 571 | if (n < 0) { |
3a331a51 JD |
572 | err_msg = "Couldn't parse device number"; |
573 | goto out; | |
574 | } | |
ae2587e4 | 575 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
576 | sprintf(error, "Invalid device number - must be between " |
577 | "%d and %d", start, end); | |
578 | err_msg = error; | |
579 | goto out; | |
580 | } | |
29d56cfe | 581 | |
f28169d2 JD |
582 | err_msg = NULL; |
583 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 584 | switch(err) { |
d40f6d71 JD |
585 | case 0: |
586 | err_msg = ""; | |
587 | break; | |
3a331a51 | 588 | case -ENODEV: |
ae2587e4 | 589 | if (err_msg == NULL) |
f28169d2 | 590 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
591 | break; |
592 | case -EBUSY: | |
ae2587e4 | 593 | if (err_msg == NULL) |
f28169d2 | 594 | err_msg = "Device is currently open"; |
3a331a51 JD |
595 | break; |
596 | default: | |
597 | break; | |
598 | } | |
599 | out: | |
29d56cfe | 600 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
601 | } |
602 | ||
f92afe56 JD |
603 | struct mconsole_output { |
604 | struct list_head list; | |
605 | struct mc_request *req; | |
606 | }; | |
607 | ||
84f48d4f | 608 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
609 | static LIST_HEAD(clients); |
610 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
611 | |
612 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 613 | unsigned int len) |
6f517d3f JD |
614 | { |
615 | struct list_head *ele; | |
616 | int n; | |
617 | ||
ae2587e4 | 618 | if (list_empty(&clients)) |
6f517d3f JD |
619 | return; |
620 | ||
54fa0ba4 JD |
621 | while (len > 0) { |
622 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
623 | strncpy(console_buf, string, n); | |
6f517d3f JD |
624 | string += n; |
625 | len -= n; | |
6f517d3f | 626 | |
ae2587e4 | 627 | list_for_each(ele, &clients) { |
f92afe56 | 628 | struct mconsole_output *entry; |
6f517d3f | 629 | |
f92afe56 | 630 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 631 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 632 | } |
6f517d3f JD |
633 | } |
634 | } | |
635 | ||
636 | static struct console mc_console = { .name = "mc", | |
637 | .write = console_write, | |
a174b30e | 638 | .flags = CON_ENABLED, |
6f517d3f JD |
639 | .index = -1 }; |
640 | ||
641 | static int mc_add_console(void) | |
642 | { | |
643 | register_console(&mc_console); | |
644 | return 0; | |
645 | } | |
646 | ||
647 | late_initcall(mc_add_console); | |
648 | ||
649 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
650 | void *arg) | |
651 | { | |
f92afe56 | 652 | struct mconsole_output entry; |
6f517d3f JD |
653 | unsigned long flags; |
654 | ||
f92afe56 | 655 | entry.req = req; |
84f48d4f | 656 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 657 | list_add(&entry.list, &clients); |
84f48d4f | 658 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
659 | |
660 | (*proc)(arg); | |
661 | ||
54fa0ba4 | 662 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 663 | |
84f48d4f | 664 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 665 | list_del(&entry.list); |
84f48d4f | 666 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
667 | } |
668 | ||
4111b025 | 669 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
670 | |
671 | #include <linux/sysrq.h> | |
672 | ||
4111b025 JD |
673 | static void sysrq_proc(void *arg) |
674 | { | |
675 | char *op = arg; | |
f335397d | 676 | handle_sysrq(*op); |
4111b025 JD |
677 | } |
678 | ||
679 | void mconsole_sysrq(struct mc_request *req) | |
680 | { | |
681 | char *ptr = req->request.data; | |
682 | ||
683 | ptr += strlen("sysrq"); | |
e7d2860b | 684 | ptr = skip_spaces(ptr); |
4111b025 | 685 | |
ae2587e4 JD |
686 | /* |
687 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
688 | * so in this case, we reply first. |
689 | */ | |
ae2587e4 | 690 | if (*ptr == 'b') |
4111b025 JD |
691 | mconsole_reply(req, "", 0, 0); |
692 | ||
693 | with_console(req, sysrq_proc, ptr); | |
694 | } | |
695 | #else | |
696 | void mconsole_sysrq(struct mc_request *req) | |
697 | { | |
698 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
699 | } | |
700 | #endif | |
701 | ||
6f517d3f JD |
702 | static void stack_proc(void *arg) |
703 | { | |
704 | struct task_struct *from = current, *to = arg; | |
705 | ||
706 | to->thread.saved_task = from; | |
707 | switch_to(from, to, from); | |
708 | } | |
709 | ||
ae2587e4 JD |
710 | /* |
711 | * Mconsole stack trace | |
3eddddcf JD |
712 | * Added by Allan Graves, Jeff Dike |
713 | * Dumps a stacks registers to the linux console. | |
714 | * Usage stack <pid>. | |
715 | */ | |
42fda663 | 716 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 717 | { |
3a331a51 JD |
718 | char *ptr = req->request.data; |
719 | int pid_requested= -1; | |
3eddddcf JD |
720 | struct task_struct *to = NULL; |
721 | ||
ae2587e4 JD |
722 | /* |
723 | * Would be nice: | |
3a331a51 | 724 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
725 | * 2) Add a way to stack dump all pids. |
726 | */ | |
727 | ||
3a331a51 | 728 | ptr += strlen("stack"); |
e7d2860b | 729 | ptr = skip_spaces(ptr); |
3eddddcf | 730 | |
ae2587e4 JD |
731 | /* |
732 | * Should really check for multiple pids or reject bad args here | |
733 | */ | |
3a331a51 | 734 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 735 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
736 | mconsole_reply(req, "Please specify a pid", 1, 0); |
737 | return; | |
738 | } | |
3eddddcf | 739 | |
827b3f6a | 740 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
ae2587e4 | 741 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
742 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
743 | return; | |
744 | } | |
6f517d3f | 745 | with_console(req, stack_proc, to); |
3eddddcf | 746 | } |
3eddddcf | 747 | |
ae2587e4 JD |
748 | /* |
749 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
750 | * active. |
751 | */ | |
d50084a2 | 752 | static char *notify_socket = NULL; |
1da177e4 | 753 | |
97a1fcbb | 754 | static int __init mconsole_init(void) |
1da177e4 LT |
755 | { |
756 | /* long to avoid size mismatch warnings from gcc */ | |
757 | long sock; | |
758 | int err; | |
36137120 | 759 | char file[UNIX_PATH_MAX]; |
1da177e4 | 760 | |
ae2587e4 JD |
761 | if (umid_file_name("mconsole", file, sizeof(file))) |
762 | return -1; | |
1da177e4 LT |
763 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
764 | ||
765 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
766 | if (sock < 0) { |
767 | printk(KERN_ERR "Failed to initialize management console\n"); | |
768 | return 1; | |
1da177e4 | 769 | } |
438ee679 JD |
770 | if (os_set_fd_block(sock, 0)) |
771 | goto out; | |
1da177e4 LT |
772 | |
773 | register_reboot_notifier(&reboot_notifier); | |
774 | ||
775 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
c0b79a90 | 776 | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 777 | "mconsole", (void *)sock); |
ae2587e4 JD |
778 | if (err) { |
779 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 780 | goto out; |
1da177e4 LT |
781 | } |
782 | ||
ae2587e4 | 783 | if (notify_socket != NULL) { |
970d6e3a | 784 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 785 | if (notify_socket != NULL) |
1da177e4 | 786 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 787 | mconsole_socket_name, |
1da177e4 LT |
788 | strlen(mconsole_socket_name) + 1); |
789 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
790 | "string\n"); | |
791 | } | |
792 | ||
ae2587e4 | 793 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 794 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 795 | return 0; |
438ee679 JD |
796 | |
797 | out: | |
798 | os_close_file(sock); | |
799 | return 1; | |
1da177e4 LT |
800 | } |
801 | ||
802 | __initcall(mconsole_init); | |
803 | ||
6613c5e8 AD |
804 | static ssize_t mconsole_proc_write(struct file *file, |
805 | const char __user *buffer, size_t count, loff_t *pos) | |
1da177e4 LT |
806 | { |
807 | char *buf; | |
808 | ||
809 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
810 | if (buf == NULL) |
811 | return -ENOMEM; | |
1da177e4 | 812 | |
ae2587e4 | 813 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
814 | count = -EFAULT; |
815 | goto out; | |
816 | } | |
817 | ||
818 | buf[count] = '\0'; | |
819 | ||
820 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
821 | out: | |
822 | kfree(buf); | |
ae2587e4 | 823 | return count; |
1da177e4 LT |
824 | } |
825 | ||
6613c5e8 AD |
826 | static const struct file_operations mconsole_proc_fops = { |
827 | .owner = THIS_MODULE, | |
828 | .write = mconsole_proc_write, | |
6038f373 | 829 | .llseek = noop_llseek, |
6613c5e8 AD |
830 | }; |
831 | ||
1da177e4 LT |
832 | static int create_proc_mconsole(void) |
833 | { | |
834 | struct proc_dir_entry *ent; | |
835 | ||
ae2587e4 JD |
836 | if (notify_socket == NULL) |
837 | return 0; | |
1da177e4 | 838 | |
6613c5e8 | 839 | ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops); |
ae2587e4 JD |
840 | if (ent == NULL) { |
841 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
842 | "failed\n"); | |
843 | return 0; | |
1da177e4 | 844 | } |
ae2587e4 | 845 | return 0; |
1da177e4 LT |
846 | } |
847 | ||
848 | static DEFINE_SPINLOCK(notify_spinlock); | |
849 | ||
850 | void lock_notify(void) | |
851 | { | |
852 | spin_lock(¬ify_spinlock); | |
853 | } | |
854 | ||
855 | void unlock_notify(void) | |
856 | { | |
857 | spin_unlock(¬ify_spinlock); | |
858 | } | |
859 | ||
860 | __initcall(create_proc_mconsole); | |
861 | ||
088bec41 | 862 | #define NOTIFY "notify:" |
1da177e4 LT |
863 | |
864 | static int mconsole_setup(char *str) | |
865 | { | |
ae2587e4 | 866 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
867 | str += strlen(NOTIFY); |
868 | notify_socket = str; | |
869 | } | |
870 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 871 | return 1; |
1da177e4 LT |
872 | } |
873 | ||
088bec41 | 874 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
875 | |
876 | __uml_help(mconsole_setup, | |
877 | "mconsole=notify:<socket>\n" | |
878 | " Requests that the mconsole driver send a message to the named Unix\n" | |
879 | " socket containing the name of the mconsole socket. This also serves\n" | |
880 | " to notify outside processes when UML has booted far enough to respond\n" | |
881 | " to mconsole requests.\n\n" | |
882 | ); | |
883 | ||
884 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
885 | void *ptr) | |
886 | { | |
887 | char *message = ptr; | |
888 | ||
ae2587e4 JD |
889 | if (notify_socket == NULL) |
890 | return 0; | |
1da177e4 | 891 | |
d50084a2 | 892 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 893 | strlen(message) + 1); |
ae2587e4 | 894 | return 0; |
1da177e4 LT |
895 | } |
896 | ||
897 | static struct notifier_block panic_exit_notifier = { | |
898 | .notifier_call = notify_panic, | |
899 | .next = NULL, | |
900 | .priority = 1 | |
901 | }; | |
902 | ||
903 | static int add_notifier(void) | |
904 | { | |
e041c683 AS |
905 | atomic_notifier_chain_register(&panic_notifier_list, |
906 | &panic_exit_notifier); | |
ae2587e4 | 907 | return 0; |
1da177e4 LT |
908 | } |
909 | ||
910 | __initcall(add_notifier); | |
911 | ||
912 | char *mconsole_notify_socket(void) | |
913 | { | |
ae2587e4 | 914 | return notify_socket; |
1da177e4 LT |
915 | } |
916 | ||
917 | EXPORT_SYMBOL(mconsole_notify_socket); |