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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; | |
4ecf09fd | 128 | struct vfsmount *mnt = current->nsproxy->pid_ns->proc_mnt; |
1da177e4 LT |
129 | struct file *file; |
130 | int n, err; | |
131 | char *ptr = req->request.data, *buf; | |
4ecf09fd | 132 | mm_segment_t old_fs = get_fs(); |
1da177e4 LT |
133 | |
134 | ptr += strlen("proc"); | |
e7d2860b | 135 | ptr = skip_spaces(ptr); |
1da177e4 | 136 | |
4ecf09fd AV |
137 | err = vfs_path_lookup(mnt->mnt_root, mnt, ptr, LOOKUP_FOLLOW, &nd); |
138 | if (err) { | |
139 | mconsole_reply(req, "Failed to look up file", 1, 0); | |
1da177e4 LT |
140 | goto out; |
141 | } | |
142 | ||
4ecf09fd AV |
143 | err = may_open(&nd.path, MAY_READ, FMODE_READ); |
144 | if (result) { | |
145 | mconsole_reply(req, "Failed to open file", 1, 0); | |
146 | path_put(&nd.path); | |
1da177e4 LT |
147 | goto out; |
148 | } | |
1da177e4 | 149 | |
745ca247 DH |
150 | file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY, |
151 | current_cred()); | |
4ecf09fd | 152 | err = PTR_ERR(file); |
ae2587e4 | 153 | if (IS_ERR(file)) { |
1da177e4 | 154 | mconsole_reply(req, "Failed to open file", 1, 0); |
4ecf09fd AV |
155 | path_put(&nd.path); |
156 | goto out; | |
1da177e4 | 157 | } |
1da177e4 LT |
158 | |
159 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 160 | if (buf == NULL) { |
1da177e4 LT |
161 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
162 | goto out_fput; | |
163 | } | |
164 | ||
4ecf09fd | 165 | if (file->f_op->read) { |
1da177e4 | 166 | do { |
4ecf09fd AV |
167 | loff_t pos; |
168 | set_fs(KERNEL_DS); | |
169 | n = vfs_read(file, buf, PAGE_SIZE - 1, &pos); | |
170 | file_pos_write(file, pos); | |
171 | set_fs(old_fs); | |
ae2587e4 | 172 | if (n >= 0) { |
1da177e4 LT |
173 | buf[n] = '\0'; |
174 | mconsole_reply(req, buf, 0, (n > 0)); | |
175 | } | |
176 | else { | |
177 | mconsole_reply(req, "Read of file failed", | |
178 | 1, 0); | |
179 | goto out_free; | |
180 | } | |
ae2587e4 | 181 | } while (n > 0); |
1da177e4 LT |
182 | } |
183 | else mconsole_reply(req, "", 0, 0); | |
184 | ||
185 | out_free: | |
186 | kfree(buf); | |
187 | out_fput: | |
188 | fput(file); | |
1da177e4 LT |
189 | out: ; |
190 | } | |
191 | #endif | |
192 | ||
193 | void mconsole_proc(struct mc_request *req) | |
194 | { | |
195 | char path[64]; | |
196 | char *buf; | |
197 | int len; | |
198 | int fd; | |
199 | int first_chunk = 1; | |
200 | char *ptr = req->request.data; | |
201 | ||
202 | ptr += strlen("proc"); | |
e7d2860b | 203 | ptr = skip_spaces(ptr); |
1da177e4 LT |
204 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
205 | ||
206 | fd = sys_open(path, 0, 0); | |
207 | if (fd < 0) { | |
208 | mconsole_reply(req, "Failed to open file", 1, 0); | |
ae2587e4 | 209 | printk(KERN_ERR "open %s: %d\n",path,fd); |
1da177e4 LT |
210 | goto out; |
211 | } | |
212 | ||
213 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 214 | if (buf == NULL) { |
1da177e4 LT |
215 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
216 | goto out_close; | |
217 | } | |
218 | ||
219 | for (;;) { | |
220 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
221 | if (len < 0) { | |
222 | mconsole_reply(req, "Read of file failed", 1, 0); | |
223 | goto out_free; | |
224 | } | |
ae2587e4 | 225 | /* Begin the file content on his own line. */ |
1da177e4 LT |
226 | if (first_chunk) { |
227 | mconsole_reply(req, "\n", 0, 1); | |
228 | first_chunk = 0; | |
229 | } | |
230 | if (len == PAGE_SIZE-1) { | |
231 | buf[len] = '\0'; | |
232 | mconsole_reply(req, buf, 0, 1); | |
233 | } else { | |
234 | buf[len] = '\0'; | |
235 | mconsole_reply(req, buf, 0, 0); | |
236 | break; | |
237 | } | |
238 | } | |
239 | ||
240 | out_free: | |
241 | kfree(buf); | |
242 | out_close: | |
243 | sys_close(fd); | |
244 | out: | |
245 | /* nothing */; | |
246 | } | |
247 | ||
248 | #define UML_MCONSOLE_HELPTEXT \ | |
249 | "Commands: \n\ | |
250 | version - Get kernel version \n\ | |
251 | help - Print this message \n\ | |
252 | halt - Halt UML \n\ | |
253 | reboot - Reboot UML \n\ | |
254 | config <dev>=<config> - Add a new device to UML; \n\ | |
255 | same syntax as command line \n\ | |
256 | config <dev> - Query the configuration of a device \n\ | |
257 | remove <dev> - Remove a device from UML \n\ | |
258 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 259 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
260 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
261 | go - continue the UML after a 'stop' \n\ | |
262 | log <string> - make UML enter <string> into the kernel log\n\ | |
263 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 264 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
265 | " |
266 | ||
267 | void mconsole_help(struct mc_request *req) | |
268 | { | |
269 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
270 | } | |
271 | ||
272 | void mconsole_halt(struct mc_request *req) | |
273 | { | |
274 | mconsole_reply(req, "", 0, 0); | |
275 | machine_halt(); | |
276 | } | |
277 | ||
278 | void mconsole_reboot(struct mc_request *req) | |
279 | { | |
280 | mconsole_reply(req, "", 0, 0); | |
281 | machine_restart(NULL); | |
282 | } | |
283 | ||
1da177e4 LT |
284 | void mconsole_cad(struct mc_request *req) |
285 | { | |
286 | mconsole_reply(req, "", 0, 0); | |
287 | ctrl_alt_del(); | |
288 | } | |
289 | ||
290 | void mconsole_go(struct mc_request *req) | |
291 | { | |
292 | mconsole_reply(req, "Not stopped", 1, 0); | |
293 | } | |
294 | ||
295 | void mconsole_stop(struct mc_request *req) | |
296 | { | |
297 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
298 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d | 299 | mconsole_reply(req, "stopped", 0, 0); |
cc0be0fb KS |
300 | for (;;) { |
301 | if (!mconsole_get_request(req->originating_fd, req)) | |
302 | continue; | |
3a51237d AV |
303 | if (req->cmd->handler == mconsole_go) |
304 | break; | |
305 | if (req->cmd->handler == mconsole_stop) { | |
306 | mconsole_reply(req, "Already stopped", 1, 0); | |
307 | continue; | |
308 | } | |
309 | if (req->cmd->handler == mconsole_sysrq) { | |
310 | struct pt_regs *old_regs; | |
311 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
312 | mconsole_sysrq(req); | |
313 | set_irq_regs(old_regs); | |
314 | continue; | |
315 | } | |
1da177e4 LT |
316 | (*req->cmd->handler)(req); |
317 | } | |
318 | os_set_fd_block(req->originating_fd, 0); | |
319 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
320 | mconsole_reply(req, "", 0, 0); | |
321 | } | |
322 | ||
84f48d4f | 323 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 324 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
325 | |
326 | void mconsole_register_dev(struct mc_device *new) | |
327 | { | |
84f48d4f JD |
328 | spin_lock(&mc_devices_lock); |
329 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 330 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 331 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
332 | } |
333 | ||
334 | static struct mc_device *mconsole_find_dev(char *name) | |
335 | { | |
336 | struct list_head *ele; | |
337 | struct mc_device *dev; | |
338 | ||
ae2587e4 | 339 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 340 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
341 | if (!strncmp(name, dev->name, strlen(dev->name))) |
342 | return dev; | |
1da177e4 | 343 | } |
ae2587e4 | 344 | return NULL; |
1da177e4 LT |
345 | } |
346 | ||
02dea087 JD |
347 | #define UNPLUGGED_PER_PAGE \ |
348 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
349 | ||
350 | struct unplugged_pages { | |
351 | struct list_head list; | |
352 | void *pages[UNPLUGGED_PER_PAGE]; | |
353 | }; | |
354 | ||
e98fa281 | 355 | static DEFINE_MUTEX(plug_mem_mutex); |
02dea087 | 356 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 357 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
358 | static int unplug_index = UNPLUGGED_PER_PAGE; |
359 | ||
f28169d2 | 360 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
361 | { |
362 | unsigned long long diff; | |
363 | int err = -EINVAL, i, add; | |
364 | char *ret; | |
365 | ||
ae2587e4 | 366 | if (str[0] != '=') { |
f28169d2 | 367 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 368 | goto out; |
f28169d2 | 369 | } |
02dea087 JD |
370 | |
371 | str++; | |
ae2587e4 | 372 | if (str[0] == '-') |
02dea087 | 373 | add = 0; |
ae2587e4 | 374 | else if (str[0] == '+') { |
02dea087 JD |
375 | add = 1; |
376 | } | |
f28169d2 JD |
377 | else { |
378 | *error_out = "Expected increment to start with '-' or '+'"; | |
379 | goto out; | |
380 | } | |
02dea087 JD |
381 | |
382 | str++; | |
383 | diff = memparse(str, &ret); | |
ae2587e4 | 384 | if (*ret != '\0') { |
f28169d2 | 385 | *error_out = "Failed to parse memory increment"; |
02dea087 | 386 | goto out; |
f28169d2 | 387 | } |
02dea087 JD |
388 | |
389 | diff /= PAGE_SIZE; | |
390 | ||
e98fa281 | 391 | mutex_lock(&plug_mem_mutex); |
ae2587e4 | 392 | for (i = 0; i < diff; i++) { |
02dea087 JD |
393 | struct unplugged_pages *unplugged; |
394 | void *addr; | |
395 | ||
ae2587e4 JD |
396 | if (add) { |
397 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
398 | break; |
399 | ||
400 | unplugged = list_entry(unplugged_pages.next, | |
401 | struct unplugged_pages, list); | |
ae2587e4 | 402 | if (unplug_index > 0) |
02dea087 JD |
403 | addr = unplugged->pages[--unplug_index]; |
404 | else { | |
405 | list_del(&unplugged->list); | |
406 | addr = unplugged; | |
407 | unplug_index = UNPLUGGED_PER_PAGE; | |
408 | } | |
409 | ||
410 | free_page((unsigned long) addr); | |
411 | unplugged_pages_count--; | |
412 | } | |
413 | else { | |
414 | struct page *page; | |
415 | ||
416 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 417 | if (page == NULL) |
02dea087 JD |
418 | break; |
419 | ||
420 | unplugged = page_address(page); | |
ae2587e4 | 421 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
422 | list_add(&unplugged->list, &unplugged_pages); |
423 | unplug_index = 0; | |
424 | } | |
425 | else { | |
426 | struct list_head *entry = unplugged_pages.next; | |
427 | addr = unplugged; | |
428 | ||
429 | unplugged = list_entry(entry, | |
430 | struct unplugged_pages, | |
431 | list); | |
02dea087 | 432 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
433 | if (err) { |
434 | printk(KERN_ERR "Failed to release " | |
435 | "memory - errno = %d\n", err); | |
f28169d2 | 436 | *error_out = "Failed to release memory"; |
84f48d4f | 437 | goto out_unlock; |
f28169d2 JD |
438 | } |
439 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
440 | } |
441 | ||
442 | unplugged_pages_count++; | |
443 | } | |
444 | } | |
445 | ||
446 | err = 0; | |
84f48d4f | 447 | out_unlock: |
e98fa281 | 448 | mutex_unlock(&plug_mem_mutex); |
02dea087 JD |
449 | out: |
450 | return err; | |
451 | } | |
452 | ||
453 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
454 | { | |
455 | char buf[sizeof("18446744073709551615")]; | |
456 | int len = 0; | |
457 | ||
458 | sprintf(buf, "%ld", uml_physmem); | |
459 | CONFIG_CHUNK(str, size, len, buf, 1); | |
460 | ||
461 | return len; | |
462 | } | |
463 | ||
464 | static int mem_id(char **str, int *start_out, int *end_out) | |
465 | { | |
466 | *start_out = 0; | |
467 | *end_out = 0; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
f28169d2 | 472 | static int mem_remove(int n, char **error_out) |
02dea087 | 473 | { |
f28169d2 | 474 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
475 | return -EBUSY; |
476 | } | |
477 | ||
478 | static struct mc_device mem_mc = { | |
84f48d4f | 479 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
480 | .name = "mem", |
481 | .config = mem_config, | |
482 | .get_config = mem_get_config, | |
483 | .id = mem_id, | |
484 | .remove = mem_remove, | |
485 | }; | |
486 | ||
97a1fcbb | 487 | static int __init mem_mc_init(void) |
02dea087 | 488 | { |
ae2587e4 | 489 | if (can_drop_memory()) |
02dea087 | 490 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
491 | else printk(KERN_ERR "Can't release memory to the host - memory " |
492 | "hotplug won't be supported\n"); | |
02dea087 JD |
493 | return 0; |
494 | } | |
495 | ||
496 | __initcall(mem_mc_init); | |
497 | ||
1da177e4 LT |
498 | #define CONFIG_BUF_SIZE 64 |
499 | ||
d50084a2 | 500 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
501 | char **), |
502 | struct mc_request *req, char *name) | |
503 | { | |
504 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
505 | int n, size; | |
506 | ||
ae2587e4 | 507 | if (get_config == NULL) { |
1da177e4 LT |
508 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
509 | return; | |
510 | } | |
511 | ||
512 | error = NULL; | |
91b165c0 | 513 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
514 | buf = default_buf; |
515 | ||
ae2587e4 | 516 | while (1) { |
1da177e4 | 517 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 518 | if (error != NULL) { |
1da177e4 LT |
519 | mconsole_reply(req, error, 1, 0); |
520 | goto out; | |
521 | } | |
522 | ||
ae2587e4 | 523 | if (n <= size) { |
1da177e4 LT |
524 | mconsole_reply(req, buf, 0, 0); |
525 | goto out; | |
526 | } | |
527 | ||
ae2587e4 | 528 | if (buf != default_buf) |
1da177e4 LT |
529 | kfree(buf); |
530 | ||
531 | size = n; | |
532 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 533 | if (buf == NULL) { |
1da177e4 LT |
534 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
535 | return; | |
536 | } | |
537 | } | |
538 | out: | |
ae2587e4 | 539 | if (buf != default_buf) |
1da177e4 | 540 | kfree(buf); |
1da177e4 LT |
541 | } |
542 | ||
543 | void mconsole_config(struct mc_request *req) | |
544 | { | |
545 | struct mc_device *dev; | |
f28169d2 | 546 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
547 | int err; |
548 | ||
549 | ptr += strlen("config"); | |
e7d2860b | 550 | ptr = skip_spaces(ptr); |
1da177e4 | 551 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 552 | if (dev == NULL) { |
1da177e4 LT |
553 | mconsole_reply(req, "Bad configuration option", 1, 0); |
554 | return; | |
555 | } | |
556 | ||
557 | name = &ptr[strlen(dev->name)]; | |
558 | ptr = name; | |
ae2587e4 | 559 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
560 | ptr++; |
561 | ||
ae2587e4 | 562 | if (*ptr == '=') { |
f28169d2 JD |
563 | err = (*dev->config)(name, &error_string); |
564 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
565 | } |
566 | else mconsole_get_config(dev->get_config, req, name); | |
567 | } | |
568 | ||
569 | void mconsole_remove(struct mc_request *req) | |
570 | { | |
d50084a2 | 571 | struct mc_device *dev; |
29d56cfe | 572 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 573 | char error[256]; |
29d56cfe | 574 | int err, start, end, n; |
1da177e4 LT |
575 | |
576 | ptr += strlen("remove"); | |
e7d2860b | 577 | ptr = skip_spaces(ptr); |
1da177e4 | 578 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 579 | if (dev == NULL) { |
1da177e4 LT |
580 | mconsole_reply(req, "Bad remove option", 1, 0); |
581 | return; | |
582 | } | |
29d56cfe | 583 | |
3a331a51 JD |
584 | ptr = &ptr[strlen(dev->name)]; |
585 | ||
586 | err = 1; | |
587 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 588 | if (n < 0) { |
3a331a51 JD |
589 | err_msg = "Couldn't parse device number"; |
590 | goto out; | |
591 | } | |
ae2587e4 | 592 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
593 | sprintf(error, "Invalid device number - must be between " |
594 | "%d and %d", start, end); | |
595 | err_msg = error; | |
596 | goto out; | |
597 | } | |
29d56cfe | 598 | |
f28169d2 JD |
599 | err_msg = NULL; |
600 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 601 | switch(err) { |
d40f6d71 JD |
602 | case 0: |
603 | err_msg = ""; | |
604 | break; | |
3a331a51 | 605 | case -ENODEV: |
ae2587e4 | 606 | if (err_msg == NULL) |
f28169d2 | 607 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
608 | break; |
609 | case -EBUSY: | |
ae2587e4 | 610 | if (err_msg == NULL) |
f28169d2 | 611 | err_msg = "Device is currently open"; |
3a331a51 JD |
612 | break; |
613 | default: | |
614 | break; | |
615 | } | |
616 | out: | |
29d56cfe | 617 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
618 | } |
619 | ||
f92afe56 JD |
620 | struct mconsole_output { |
621 | struct list_head list; | |
622 | struct mc_request *req; | |
623 | }; | |
624 | ||
84f48d4f | 625 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
626 | static LIST_HEAD(clients); |
627 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
628 | |
629 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 630 | unsigned int len) |
6f517d3f JD |
631 | { |
632 | struct list_head *ele; | |
633 | int n; | |
634 | ||
ae2587e4 | 635 | if (list_empty(&clients)) |
6f517d3f JD |
636 | return; |
637 | ||
54fa0ba4 JD |
638 | while (len > 0) { |
639 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
640 | strncpy(console_buf, string, n); | |
6f517d3f JD |
641 | string += n; |
642 | len -= n; | |
6f517d3f | 643 | |
ae2587e4 | 644 | list_for_each(ele, &clients) { |
f92afe56 | 645 | struct mconsole_output *entry; |
6f517d3f | 646 | |
f92afe56 | 647 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 648 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 649 | } |
6f517d3f JD |
650 | } |
651 | } | |
652 | ||
653 | static struct console mc_console = { .name = "mc", | |
654 | .write = console_write, | |
a174b30e | 655 | .flags = CON_ENABLED, |
6f517d3f JD |
656 | .index = -1 }; |
657 | ||
658 | static int mc_add_console(void) | |
659 | { | |
660 | register_console(&mc_console); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | late_initcall(mc_add_console); | |
665 | ||
666 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
667 | void *arg) | |
668 | { | |
f92afe56 | 669 | struct mconsole_output entry; |
6f517d3f JD |
670 | unsigned long flags; |
671 | ||
f92afe56 | 672 | entry.req = req; |
84f48d4f | 673 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 674 | list_add(&entry.list, &clients); |
84f48d4f | 675 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
676 | |
677 | (*proc)(arg); | |
678 | ||
54fa0ba4 | 679 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 680 | |
84f48d4f | 681 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 682 | list_del(&entry.list); |
84f48d4f | 683 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
684 | } |
685 | ||
4111b025 | 686 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
687 | |
688 | #include <linux/sysrq.h> | |
689 | ||
4111b025 JD |
690 | static void sysrq_proc(void *arg) |
691 | { | |
692 | char *op = arg; | |
7bea96fd | 693 | handle_sysrq(*op, NULL); |
4111b025 JD |
694 | } |
695 | ||
696 | void mconsole_sysrq(struct mc_request *req) | |
697 | { | |
698 | char *ptr = req->request.data; | |
699 | ||
700 | ptr += strlen("sysrq"); | |
e7d2860b | 701 | ptr = skip_spaces(ptr); |
4111b025 | 702 | |
ae2587e4 JD |
703 | /* |
704 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
705 | * so in this case, we reply first. |
706 | */ | |
ae2587e4 | 707 | if (*ptr == 'b') |
4111b025 JD |
708 | mconsole_reply(req, "", 0, 0); |
709 | ||
710 | with_console(req, sysrq_proc, ptr); | |
711 | } | |
712 | #else | |
713 | void mconsole_sysrq(struct mc_request *req) | |
714 | { | |
715 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
716 | } | |
717 | #endif | |
718 | ||
6f517d3f JD |
719 | static void stack_proc(void *arg) |
720 | { | |
721 | struct task_struct *from = current, *to = arg; | |
722 | ||
723 | to->thread.saved_task = from; | |
724 | switch_to(from, to, from); | |
725 | } | |
726 | ||
ae2587e4 JD |
727 | /* |
728 | * Mconsole stack trace | |
3eddddcf JD |
729 | * Added by Allan Graves, Jeff Dike |
730 | * Dumps a stacks registers to the linux console. | |
731 | * Usage stack <pid>. | |
732 | */ | |
42fda663 | 733 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 734 | { |
3a331a51 JD |
735 | char *ptr = req->request.data; |
736 | int pid_requested= -1; | |
3eddddcf JD |
737 | struct task_struct *to = NULL; |
738 | ||
ae2587e4 JD |
739 | /* |
740 | * Would be nice: | |
3a331a51 | 741 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
742 | * 2) Add a way to stack dump all pids. |
743 | */ | |
744 | ||
3a331a51 | 745 | ptr += strlen("stack"); |
e7d2860b | 746 | ptr = skip_spaces(ptr); |
3eddddcf | 747 | |
ae2587e4 JD |
748 | /* |
749 | * Should really check for multiple pids or reject bad args here | |
750 | */ | |
3a331a51 | 751 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 752 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
753 | mconsole_reply(req, "Please specify a pid", 1, 0); |
754 | return; | |
755 | } | |
3eddddcf | 756 | |
827b3f6a | 757 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
ae2587e4 | 758 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
759 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
760 | return; | |
761 | } | |
6f517d3f | 762 | with_console(req, stack_proc, to); |
3eddddcf | 763 | } |
3eddddcf | 764 | |
ae2587e4 JD |
765 | /* |
766 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
767 | * active. |
768 | */ | |
d50084a2 | 769 | static char *notify_socket = NULL; |
1da177e4 | 770 | |
97a1fcbb | 771 | static int __init mconsole_init(void) |
1da177e4 LT |
772 | { |
773 | /* long to avoid size mismatch warnings from gcc */ | |
774 | long sock; | |
775 | int err; | |
36137120 | 776 | char file[UNIX_PATH_MAX]; |
1da177e4 | 777 | |
ae2587e4 JD |
778 | if (umid_file_name("mconsole", file, sizeof(file))) |
779 | return -1; | |
1da177e4 LT |
780 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
781 | ||
782 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
783 | if (sock < 0) { |
784 | printk(KERN_ERR "Failed to initialize management console\n"); | |
785 | return 1; | |
1da177e4 | 786 | } |
438ee679 JD |
787 | if (os_set_fd_block(sock, 0)) |
788 | goto out; | |
1da177e4 LT |
789 | |
790 | register_reboot_notifier(&reboot_notifier); | |
791 | ||
792 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 793 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 794 | "mconsole", (void *)sock); |
ae2587e4 JD |
795 | if (err) { |
796 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 797 | goto out; |
1da177e4 LT |
798 | } |
799 | ||
ae2587e4 | 800 | if (notify_socket != NULL) { |
970d6e3a | 801 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 802 | if (notify_socket != NULL) |
1da177e4 | 803 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 804 | mconsole_socket_name, |
1da177e4 LT |
805 | strlen(mconsole_socket_name) + 1); |
806 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
807 | "string\n"); | |
808 | } | |
809 | ||
ae2587e4 | 810 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 811 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 812 | return 0; |
438ee679 JD |
813 | |
814 | out: | |
815 | os_close_file(sock); | |
816 | return 1; | |
1da177e4 LT |
817 | } |
818 | ||
819 | __initcall(mconsole_init); | |
820 | ||
6613c5e8 AD |
821 | static ssize_t mconsole_proc_write(struct file *file, |
822 | const char __user *buffer, size_t count, loff_t *pos) | |
1da177e4 LT |
823 | { |
824 | char *buf; | |
825 | ||
826 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
827 | if (buf == NULL) |
828 | return -ENOMEM; | |
1da177e4 | 829 | |
ae2587e4 | 830 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
831 | count = -EFAULT; |
832 | goto out; | |
833 | } | |
834 | ||
835 | buf[count] = '\0'; | |
836 | ||
837 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
838 | out: | |
839 | kfree(buf); | |
ae2587e4 | 840 | return count; |
1da177e4 LT |
841 | } |
842 | ||
6613c5e8 AD |
843 | static const struct file_operations mconsole_proc_fops = { |
844 | .owner = THIS_MODULE, | |
845 | .write = mconsole_proc_write, | |
846 | }; | |
847 | ||
1da177e4 LT |
848 | static int create_proc_mconsole(void) |
849 | { | |
850 | struct proc_dir_entry *ent; | |
851 | ||
ae2587e4 JD |
852 | if (notify_socket == NULL) |
853 | return 0; | |
1da177e4 | 854 | |
6613c5e8 | 855 | ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops); |
ae2587e4 JD |
856 | if (ent == NULL) { |
857 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
858 | "failed\n"); | |
859 | return 0; | |
1da177e4 | 860 | } |
ae2587e4 | 861 | return 0; |
1da177e4 LT |
862 | } |
863 | ||
864 | static DEFINE_SPINLOCK(notify_spinlock); | |
865 | ||
866 | void lock_notify(void) | |
867 | { | |
868 | spin_lock(¬ify_spinlock); | |
869 | } | |
870 | ||
871 | void unlock_notify(void) | |
872 | { | |
873 | spin_unlock(¬ify_spinlock); | |
874 | } | |
875 | ||
876 | __initcall(create_proc_mconsole); | |
877 | ||
088bec41 | 878 | #define NOTIFY "notify:" |
1da177e4 LT |
879 | |
880 | static int mconsole_setup(char *str) | |
881 | { | |
ae2587e4 | 882 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
883 | str += strlen(NOTIFY); |
884 | notify_socket = str; | |
885 | } | |
886 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 887 | return 1; |
1da177e4 LT |
888 | } |
889 | ||
088bec41 | 890 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
891 | |
892 | __uml_help(mconsole_setup, | |
893 | "mconsole=notify:<socket>\n" | |
894 | " Requests that the mconsole driver send a message to the named Unix\n" | |
895 | " socket containing the name of the mconsole socket. This also serves\n" | |
896 | " to notify outside processes when UML has booted far enough to respond\n" | |
897 | " to mconsole requests.\n\n" | |
898 | ); | |
899 | ||
900 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
901 | void *ptr) | |
902 | { | |
903 | char *message = ptr; | |
904 | ||
ae2587e4 JD |
905 | if (notify_socket == NULL) |
906 | return 0; | |
1da177e4 | 907 | |
d50084a2 | 908 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 909 | strlen(message) + 1); |
ae2587e4 | 910 | return 0; |
1da177e4 LT |
911 | } |
912 | ||
913 | static struct notifier_block panic_exit_notifier = { | |
914 | .notifier_call = notify_panic, | |
915 | .next = NULL, | |
916 | .priority = 1 | |
917 | }; | |
918 | ||
919 | static int add_notifier(void) | |
920 | { | |
e041c683 AS |
921 | atomic_notifier_chain_register(&panic_notifier_list, |
922 | &panic_exit_notifier); | |
ae2587e4 | 923 | return 0; |
1da177e4 LT |
924 | } |
925 | ||
926 | __initcall(add_notifier); | |
927 | ||
928 | char *mconsole_notify_socket(void) | |
929 | { | |
ae2587e4 | 930 | return notify_socket; |
1da177e4 LT |
931 | } |
932 | ||
933 | EXPORT_SYMBOL(mconsole_notify_socket); |