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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> | |
9 | #include <linux/interrupt.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/notifier.h> | |
14 | #include <linux/reboot.h> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/syscalls.h> | |
18 | #include <linux/utsname.h> | |
36137120 BS |
19 | #include <linux/socket.h> |
20 | #include <linux/un.h> | |
827b3f6a JD |
21 | #include <linux/workqueue.h> |
22 | #include <linux/mutex.h> | |
23 | #include <asm/uaccess.h> | |
24 | ||
ae2587e4 JD |
25 | #include "init.h" |
26 | #include "irq_kern.h" | |
27 | #include "irq_user.h" | |
1da177e4 | 28 | #include "kern_util.h" |
1da177e4 LT |
29 | #include "mconsole.h" |
30 | #include "mconsole_kern.h" | |
1da177e4 | 31 | #include "os.h" |
1da177e4 | 32 | |
d50084a2 | 33 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
34 | unsigned long what, void *data) |
35 | { | |
ae2587e4 | 36 | return mconsole_unlink_socket(); |
1da177e4 LT |
37 | } |
38 | ||
39 | ||
40 | static struct notifier_block reboot_notifier = { | |
41 | .notifier_call = do_unlink_socket, | |
42 | .priority = 0, | |
43 | }; | |
44 | ||
d50084a2 | 45 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
46 | * locking, and the interrupt handler is safe because it can't interrupt |
47 | * itself and it can only happen on CPU 0. | |
48 | */ | |
49 | ||
9010772c | 50 | static LIST_HEAD(mc_requests); |
1da177e4 | 51 | |
6d5aefb8 | 52 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
53 | { |
54 | struct mconsole_entry *req; | |
55 | unsigned long flags; | |
56 | ||
ae2587e4 | 57 | while (!list_empty(&mc_requests)) { |
dbdb4c06 | 58 | local_irq_save(flags); |
ae2587e4 | 59 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
1da177e4 LT |
60 | list_del(&req->list); |
61 | local_irq_restore(flags); | |
62 | req->request.cmd->handler(&req->request); | |
63 | kfree(req); | |
64 | } | |
65 | } | |
66 | ||
6d5aefb8 | 67 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 68 | |
7bea96fd | 69 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
70 | { |
71 | /* long to avoid size mismatch warnings from gcc */ | |
72 | long fd; | |
73 | struct mconsole_entry *new; | |
3a51237d | 74 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
75 | |
76 | fd = (long) dev_id; | |
ae2587e4 JD |
77 | while (mconsole_get_request(fd, &req)) { |
78 | if (req.cmd->context == MCONSOLE_INTR) | |
1da177e4 LT |
79 | (*req.cmd->handler)(&req); |
80 | else { | |
60baa158 | 81 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
ae2587e4 | 82 | if (new == NULL) |
1da177e4 LT |
83 | mconsole_reply(&req, "Out of memory", 1, 0); |
84 | else { | |
85 | new->request = req; | |
3a51237d | 86 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
87 | list_add(&new->list, &mc_requests); |
88 | } | |
89 | } | |
90 | } | |
ae2587e4 | 91 | if (!list_empty(&mc_requests)) |
1da177e4 LT |
92 | schedule_work(&mconsole_work); |
93 | reactivate_fd(fd, MCONSOLE_IRQ); | |
ae2587e4 | 94 | return IRQ_HANDLED; |
1da177e4 LT |
95 | } |
96 | ||
97 | void mconsole_version(struct mc_request *req) | |
98 | { | |
99 | char version[256]; | |
100 | ||
e9ff3990 | 101 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
ae2587e4 JD |
102 | utsname()->nodename, utsname()->release, utsname()->version, |
103 | utsname()->machine); | |
1da177e4 LT |
104 | mconsole_reply(req, version, 0, 0); |
105 | } | |
106 | ||
107 | void mconsole_log(struct mc_request *req) | |
108 | { | |
109 | int len; | |
110 | char *ptr = req->request.data; | |
111 | ||
112 | ptr += strlen("log "); | |
113 | ||
114 | len = req->len - (ptr - req->request.data); | |
ae2587e4 | 115 | printk(KERN_WARNING "%.*s", len, ptr); |
1da177e4 LT |
116 | mconsole_reply(req, "", 0, 0); |
117 | } | |
118 | ||
119 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
120 | * problems; however, we need it fixed, because it is expected that UML users | |
121 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
122 | * show the real procfs content, not the ones from hppfs.*/ | |
123 | #if 0 | |
124 | void mconsole_proc(struct mc_request *req) | |
125 | { | |
126 | struct nameidata nd; | |
127 | struct file_system_type *proc; | |
128 | struct super_block *super; | |
129 | struct file *file; | |
130 | int n, err; | |
131 | char *ptr = req->request.data, *buf; | |
132 | ||
133 | ptr += strlen("proc"); | |
ae2587e4 | 134 | while (isspace(*ptr)) ptr++; |
1da177e4 LT |
135 | |
136 | proc = get_fs_type("proc"); | |
ae2587e4 | 137 | if (proc == NULL) { |
1da177e4 LT |
138 | mconsole_reply(req, "procfs not registered", 1, 0); |
139 | goto out; | |
140 | } | |
141 | ||
142 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
143 | put_filesystem(proc); | |
ae2587e4 | 144 | if (super == NULL) { |
1da177e4 LT |
145 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
146 | goto out; | |
147 | } | |
148 | up_write(&super->s_umount); | |
149 | ||
4ac91378 JB |
150 | nd.path.dentry = super->s_root; |
151 | nd.path.mnt = NULL; | |
1da177e4 LT |
152 | nd.flags = O_RDONLY + 1; |
153 | nd.last_type = LAST_ROOT; | |
154 | ||
155 | /* START: it was experienced that the stability problems are closed | |
156 | * if commenting out these two calls + the below read cycle. To | |
157 | * make UML crash again, it was enough to readd either one.*/ | |
158 | err = link_path_walk(ptr, &nd); | |
ae2587e4 | 159 | if (err) { |
1da177e4 LT |
160 | mconsole_reply(req, "Failed to look up file", 1, 0); |
161 | goto out_kill; | |
162 | } | |
163 | ||
745ca247 DH |
164 | file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY, |
165 | current_cred()); | |
ae2587e4 | 166 | if (IS_ERR(file)) { |
1da177e4 LT |
167 | mconsole_reply(req, "Failed to open file", 1, 0); |
168 | goto out_kill; | |
169 | } | |
170 | /*END*/ | |
171 | ||
172 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 173 | if (buf == NULL) { |
1da177e4 LT |
174 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
175 | goto out_fput; | |
176 | } | |
177 | ||
ae2587e4 | 178 | if ((file->f_op != NULL) && (file->f_op->read != NULL)) { |
1da177e4 LT |
179 | do { |
180 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
181 | &file->f_pos); | |
ae2587e4 | 182 | if (n >= 0) { |
1da177e4 LT |
183 | buf[n] = '\0'; |
184 | mconsole_reply(req, buf, 0, (n > 0)); | |
185 | } | |
186 | else { | |
187 | mconsole_reply(req, "Read of file failed", | |
188 | 1, 0); | |
189 | goto out_free; | |
190 | } | |
ae2587e4 | 191 | } while (n > 0); |
1da177e4 LT |
192 | } |
193 | else mconsole_reply(req, "", 0, 0); | |
194 | ||
195 | out_free: | |
196 | kfree(buf); | |
197 | out_fput: | |
198 | fput(file); | |
199 | out_kill: | |
200 | deactivate_super(super); | |
201 | out: ; | |
202 | } | |
203 | #endif | |
204 | ||
205 | void mconsole_proc(struct mc_request *req) | |
206 | { | |
207 | char path[64]; | |
208 | char *buf; | |
209 | int len; | |
210 | int fd; | |
211 | int first_chunk = 1; | |
212 | char *ptr = req->request.data; | |
213 | ||
214 | ptr += strlen("proc"); | |
ae2587e4 JD |
215 | while (isspace(*ptr)) |
216 | 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"); | |
ae2587e4 JD |
563 | while (isspace(*ptr)) |
564 | ptr++; | |
1da177e4 | 565 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 566 | if (dev == NULL) { |
1da177e4 LT |
567 | mconsole_reply(req, "Bad configuration option", 1, 0); |
568 | return; | |
569 | } | |
570 | ||
571 | name = &ptr[strlen(dev->name)]; | |
572 | ptr = name; | |
ae2587e4 | 573 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
574 | ptr++; |
575 | ||
ae2587e4 | 576 | if (*ptr == '=') { |
f28169d2 JD |
577 | err = (*dev->config)(name, &error_string); |
578 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
579 | } |
580 | else mconsole_get_config(dev->get_config, req, name); | |
581 | } | |
582 | ||
583 | void mconsole_remove(struct mc_request *req) | |
584 | { | |
d50084a2 | 585 | struct mc_device *dev; |
29d56cfe | 586 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 587 | char error[256]; |
29d56cfe | 588 | int err, start, end, n; |
1da177e4 LT |
589 | |
590 | ptr += strlen("remove"); | |
ae2587e4 | 591 | while (isspace(*ptr)) ptr++; |
1da177e4 | 592 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 593 | if (dev == NULL) { |
1da177e4 LT |
594 | mconsole_reply(req, "Bad remove option", 1, 0); |
595 | return; | |
596 | } | |
29d56cfe | 597 | |
3a331a51 JD |
598 | ptr = &ptr[strlen(dev->name)]; |
599 | ||
600 | err = 1; | |
601 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 602 | if (n < 0) { |
3a331a51 JD |
603 | err_msg = "Couldn't parse device number"; |
604 | goto out; | |
605 | } | |
ae2587e4 | 606 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
607 | sprintf(error, "Invalid device number - must be between " |
608 | "%d and %d", start, end); | |
609 | err_msg = error; | |
610 | goto out; | |
611 | } | |
29d56cfe | 612 | |
f28169d2 JD |
613 | err_msg = NULL; |
614 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 615 | switch(err) { |
d40f6d71 JD |
616 | case 0: |
617 | err_msg = ""; | |
618 | break; | |
3a331a51 | 619 | case -ENODEV: |
ae2587e4 | 620 | if (err_msg == NULL) |
f28169d2 | 621 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
622 | break; |
623 | case -EBUSY: | |
ae2587e4 | 624 | if (err_msg == NULL) |
f28169d2 | 625 | err_msg = "Device is currently open"; |
3a331a51 JD |
626 | break; |
627 | default: | |
628 | break; | |
629 | } | |
630 | out: | |
29d56cfe | 631 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
632 | } |
633 | ||
f92afe56 JD |
634 | struct mconsole_output { |
635 | struct list_head list; | |
636 | struct mc_request *req; | |
637 | }; | |
638 | ||
84f48d4f | 639 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
640 | static LIST_HEAD(clients); |
641 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
642 | |
643 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 644 | unsigned int len) |
6f517d3f JD |
645 | { |
646 | struct list_head *ele; | |
647 | int n; | |
648 | ||
ae2587e4 | 649 | if (list_empty(&clients)) |
6f517d3f JD |
650 | return; |
651 | ||
54fa0ba4 JD |
652 | while (len > 0) { |
653 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
654 | strncpy(console_buf, string, n); | |
6f517d3f JD |
655 | string += n; |
656 | len -= n; | |
6f517d3f | 657 | |
ae2587e4 | 658 | list_for_each(ele, &clients) { |
f92afe56 | 659 | struct mconsole_output *entry; |
6f517d3f | 660 | |
f92afe56 | 661 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 662 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 663 | } |
6f517d3f JD |
664 | } |
665 | } | |
666 | ||
667 | static struct console mc_console = { .name = "mc", | |
668 | .write = console_write, | |
a174b30e | 669 | .flags = CON_ENABLED, |
6f517d3f JD |
670 | .index = -1 }; |
671 | ||
672 | static int mc_add_console(void) | |
673 | { | |
674 | register_console(&mc_console); | |
675 | return 0; | |
676 | } | |
677 | ||
678 | late_initcall(mc_add_console); | |
679 | ||
680 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
681 | void *arg) | |
682 | { | |
f92afe56 | 683 | struct mconsole_output entry; |
6f517d3f JD |
684 | unsigned long flags; |
685 | ||
f92afe56 | 686 | entry.req = req; |
84f48d4f | 687 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 688 | list_add(&entry.list, &clients); |
84f48d4f | 689 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
690 | |
691 | (*proc)(arg); | |
692 | ||
54fa0ba4 | 693 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 694 | |
84f48d4f | 695 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 696 | list_del(&entry.list); |
84f48d4f | 697 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
698 | } |
699 | ||
4111b025 | 700 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
701 | |
702 | #include <linux/sysrq.h> | |
703 | ||
4111b025 JD |
704 | static void sysrq_proc(void *arg) |
705 | { | |
706 | char *op = arg; | |
7bea96fd | 707 | handle_sysrq(*op, NULL); |
4111b025 JD |
708 | } |
709 | ||
710 | void mconsole_sysrq(struct mc_request *req) | |
711 | { | |
712 | char *ptr = req->request.data; | |
713 | ||
714 | ptr += strlen("sysrq"); | |
ae2587e4 | 715 | while (isspace(*ptr)) ptr++; |
4111b025 | 716 | |
ae2587e4 JD |
717 | /* |
718 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
719 | * so in this case, we reply first. |
720 | */ | |
ae2587e4 | 721 | if (*ptr == 'b') |
4111b025 JD |
722 | mconsole_reply(req, "", 0, 0); |
723 | ||
724 | with_console(req, sysrq_proc, ptr); | |
725 | } | |
726 | #else | |
727 | void mconsole_sysrq(struct mc_request *req) | |
728 | { | |
729 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
730 | } | |
731 | #endif | |
732 | ||
6f517d3f JD |
733 | static void stack_proc(void *arg) |
734 | { | |
735 | struct task_struct *from = current, *to = arg; | |
736 | ||
737 | to->thread.saved_task = from; | |
738 | switch_to(from, to, from); | |
739 | } | |
740 | ||
ae2587e4 JD |
741 | /* |
742 | * Mconsole stack trace | |
3eddddcf JD |
743 | * Added by Allan Graves, Jeff Dike |
744 | * Dumps a stacks registers to the linux console. | |
745 | * Usage stack <pid>. | |
746 | */ | |
42fda663 | 747 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 748 | { |
3a331a51 JD |
749 | char *ptr = req->request.data; |
750 | int pid_requested= -1; | |
3eddddcf JD |
751 | struct task_struct *to = NULL; |
752 | ||
ae2587e4 JD |
753 | /* |
754 | * Would be nice: | |
3a331a51 | 755 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
756 | * 2) Add a way to stack dump all pids. |
757 | */ | |
758 | ||
3a331a51 | 759 | ptr += strlen("stack"); |
ae2587e4 JD |
760 | while (isspace(*ptr)) |
761 | ptr++; | |
3eddddcf | 762 | |
ae2587e4 JD |
763 | /* |
764 | * Should really check for multiple pids or reject bad args here | |
765 | */ | |
3a331a51 | 766 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 767 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
768 | mconsole_reply(req, "Please specify a pid", 1, 0); |
769 | return; | |
770 | } | |
3eddddcf | 771 | |
827b3f6a | 772 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
ae2587e4 | 773 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
774 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
775 | return; | |
776 | } | |
6f517d3f | 777 | with_console(req, stack_proc, to); |
3eddddcf | 778 | } |
3eddddcf | 779 | |
ae2587e4 JD |
780 | /* |
781 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
782 | * active. |
783 | */ | |
d50084a2 | 784 | static char *notify_socket = NULL; |
1da177e4 | 785 | |
97a1fcbb | 786 | static int __init mconsole_init(void) |
1da177e4 LT |
787 | { |
788 | /* long to avoid size mismatch warnings from gcc */ | |
789 | long sock; | |
790 | int err; | |
36137120 | 791 | char file[UNIX_PATH_MAX]; |
1da177e4 | 792 | |
ae2587e4 JD |
793 | if (umid_file_name("mconsole", file, sizeof(file))) |
794 | return -1; | |
1da177e4 LT |
795 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
796 | ||
797 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
798 | if (sock < 0) { |
799 | printk(KERN_ERR "Failed to initialize management console\n"); | |
800 | return 1; | |
1da177e4 | 801 | } |
438ee679 JD |
802 | if (os_set_fd_block(sock, 0)) |
803 | goto out; | |
1da177e4 LT |
804 | |
805 | register_reboot_notifier(&reboot_notifier); | |
806 | ||
807 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 808 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 809 | "mconsole", (void *)sock); |
ae2587e4 JD |
810 | if (err) { |
811 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 812 | goto out; |
1da177e4 LT |
813 | } |
814 | ||
ae2587e4 | 815 | if (notify_socket != NULL) { |
970d6e3a | 816 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 817 | if (notify_socket != NULL) |
1da177e4 | 818 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 819 | mconsole_socket_name, |
1da177e4 LT |
820 | strlen(mconsole_socket_name) + 1); |
821 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
822 | "string\n"); | |
823 | } | |
824 | ||
ae2587e4 | 825 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 826 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 827 | return 0; |
438ee679 JD |
828 | |
829 | out: | |
830 | os_close_file(sock); | |
831 | return 1; | |
1da177e4 LT |
832 | } |
833 | ||
834 | __initcall(mconsole_init); | |
835 | ||
6613c5e8 AD |
836 | static ssize_t mconsole_proc_write(struct file *file, |
837 | const char __user *buffer, size_t count, loff_t *pos) | |
1da177e4 LT |
838 | { |
839 | char *buf; | |
840 | ||
841 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
842 | if (buf == NULL) |
843 | return -ENOMEM; | |
1da177e4 | 844 | |
ae2587e4 | 845 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
846 | count = -EFAULT; |
847 | goto out; | |
848 | } | |
849 | ||
850 | buf[count] = '\0'; | |
851 | ||
852 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
853 | out: | |
854 | kfree(buf); | |
ae2587e4 | 855 | return count; |
1da177e4 LT |
856 | } |
857 | ||
6613c5e8 AD |
858 | static const struct file_operations mconsole_proc_fops = { |
859 | .owner = THIS_MODULE, | |
860 | .write = mconsole_proc_write, | |
861 | }; | |
862 | ||
1da177e4 LT |
863 | static int create_proc_mconsole(void) |
864 | { | |
865 | struct proc_dir_entry *ent; | |
866 | ||
ae2587e4 JD |
867 | if (notify_socket == NULL) |
868 | return 0; | |
1da177e4 | 869 | |
6613c5e8 | 870 | ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops); |
ae2587e4 JD |
871 | if (ent == NULL) { |
872 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
873 | "failed\n"); | |
874 | return 0; | |
1da177e4 | 875 | } |
ae2587e4 | 876 | return 0; |
1da177e4 LT |
877 | } |
878 | ||
879 | static DEFINE_SPINLOCK(notify_spinlock); | |
880 | ||
881 | void lock_notify(void) | |
882 | { | |
883 | spin_lock(¬ify_spinlock); | |
884 | } | |
885 | ||
886 | void unlock_notify(void) | |
887 | { | |
888 | spin_unlock(¬ify_spinlock); | |
889 | } | |
890 | ||
891 | __initcall(create_proc_mconsole); | |
892 | ||
088bec41 | 893 | #define NOTIFY "notify:" |
1da177e4 LT |
894 | |
895 | static int mconsole_setup(char *str) | |
896 | { | |
ae2587e4 | 897 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
898 | str += strlen(NOTIFY); |
899 | notify_socket = str; | |
900 | } | |
901 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 902 | return 1; |
1da177e4 LT |
903 | } |
904 | ||
088bec41 | 905 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
906 | |
907 | __uml_help(mconsole_setup, | |
908 | "mconsole=notify:<socket>\n" | |
909 | " Requests that the mconsole driver send a message to the named Unix\n" | |
910 | " socket containing the name of the mconsole socket. This also serves\n" | |
911 | " to notify outside processes when UML has booted far enough to respond\n" | |
912 | " to mconsole requests.\n\n" | |
913 | ); | |
914 | ||
915 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
916 | void *ptr) | |
917 | { | |
918 | char *message = ptr; | |
919 | ||
ae2587e4 JD |
920 | if (notify_socket == NULL) |
921 | return 0; | |
1da177e4 | 922 | |
d50084a2 | 923 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 924 | strlen(message) + 1); |
ae2587e4 | 925 | return 0; |
1da177e4 LT |
926 | } |
927 | ||
928 | static struct notifier_block panic_exit_notifier = { | |
929 | .notifier_call = notify_panic, | |
930 | .next = NULL, | |
931 | .priority = 1 | |
932 | }; | |
933 | ||
934 | static int add_notifier(void) | |
935 | { | |
e041c683 AS |
936 | atomic_notifier_chain_register(&panic_notifier_list, |
937 | &panic_exit_notifier); | |
ae2587e4 | 938 | return 0; |
1da177e4 LT |
939 | } |
940 | ||
941 | __initcall(add_notifier); | |
942 | ||
943 | char *mconsole_notify_socket(void) | |
944 | { | |
ae2587e4 | 945 | return notify_socket; |
1da177e4 LT |
946 | } |
947 | ||
948 | EXPORT_SYMBOL(mconsole_notify_socket); |