Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) | |
ae2587e4 | 3 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
4 | * Licensed under the GPL |
5 | */ | |
6 | ||
ae2587e4 | 7 | #include "linux/console.h" |
1da177e4 LT |
8 | #include "linux/ctype.h" |
9 | #include "linux/interrupt.h" | |
ae2587e4 JD |
10 | #include "linux/list.h" |
11 | #include "linux/mm.h" | |
1da177e4 | 12 | #include "linux/module.h" |
ae2587e4 JD |
13 | #include "linux/notifier.h" |
14 | #include "linux/reboot.h" | |
1da177e4 | 15 | #include "linux/proc_fs.h" |
ae2587e4 | 16 | #include "linux/slab.h" |
1da177e4 | 17 | #include "linux/syscalls.h" |
ae2587e4 JD |
18 | #include "linux/utsname.h" |
19 | #include "linux/workqueue.h" | |
1da177e4 | 20 | #include "asm/uaccess.h" |
ae2587e4 JD |
21 | #include "init.h" |
22 | #include "irq_kern.h" | |
23 | #include "irq_user.h" | |
1da177e4 | 24 | #include "kern_util.h" |
1da177e4 LT |
25 | #include "mconsole.h" |
26 | #include "mconsole_kern.h" | |
1da177e4 | 27 | #include "os.h" |
1da177e4 | 28 | |
d50084a2 | 29 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
30 | unsigned long what, void *data) |
31 | { | |
ae2587e4 | 32 | return mconsole_unlink_socket(); |
1da177e4 LT |
33 | } |
34 | ||
35 | ||
36 | static struct notifier_block reboot_notifier = { | |
37 | .notifier_call = do_unlink_socket, | |
38 | .priority = 0, | |
39 | }; | |
40 | ||
d50084a2 | 41 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
42 | * locking, and the interrupt handler is safe because it can't interrupt |
43 | * itself and it can only happen on CPU 0. | |
44 | */ | |
45 | ||
9010772c | 46 | static LIST_HEAD(mc_requests); |
1da177e4 | 47 | |
6d5aefb8 | 48 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
49 | { |
50 | struct mconsole_entry *req; | |
51 | unsigned long flags; | |
52 | ||
ae2587e4 | 53 | while (!list_empty(&mc_requests)) { |
dbdb4c06 | 54 | local_irq_save(flags); |
ae2587e4 | 55 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
1da177e4 LT |
56 | list_del(&req->list); |
57 | local_irq_restore(flags); | |
58 | req->request.cmd->handler(&req->request); | |
59 | kfree(req); | |
60 | } | |
61 | } | |
62 | ||
6d5aefb8 | 63 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 64 | |
7bea96fd | 65 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
66 | { |
67 | /* long to avoid size mismatch warnings from gcc */ | |
68 | long fd; | |
69 | struct mconsole_entry *new; | |
3a51237d | 70 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
71 | |
72 | fd = (long) dev_id; | |
ae2587e4 JD |
73 | while (mconsole_get_request(fd, &req)) { |
74 | if (req.cmd->context == MCONSOLE_INTR) | |
1da177e4 LT |
75 | (*req.cmd->handler)(&req); |
76 | else { | |
60baa158 | 77 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
ae2587e4 | 78 | if (new == NULL) |
1da177e4 LT |
79 | mconsole_reply(&req, "Out of memory", 1, 0); |
80 | else { | |
81 | new->request = req; | |
3a51237d | 82 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
83 | list_add(&new->list, &mc_requests); |
84 | } | |
85 | } | |
86 | } | |
ae2587e4 | 87 | if (!list_empty(&mc_requests)) |
1da177e4 LT |
88 | schedule_work(&mconsole_work); |
89 | reactivate_fd(fd, MCONSOLE_IRQ); | |
ae2587e4 | 90 | return IRQ_HANDLED; |
1da177e4 LT |
91 | } |
92 | ||
93 | void mconsole_version(struct mc_request *req) | |
94 | { | |
95 | char version[256]; | |
96 | ||
e9ff3990 | 97 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
ae2587e4 JD |
98 | utsname()->nodename, utsname()->release, utsname()->version, |
99 | utsname()->machine); | |
1da177e4 LT |
100 | mconsole_reply(req, version, 0, 0); |
101 | } | |
102 | ||
103 | void mconsole_log(struct mc_request *req) | |
104 | { | |
105 | int len; | |
106 | char *ptr = req->request.data; | |
107 | ||
108 | ptr += strlen("log "); | |
109 | ||
110 | len = req->len - (ptr - req->request.data); | |
ae2587e4 | 111 | printk(KERN_WARNING "%.*s", len, ptr); |
1da177e4 LT |
112 | mconsole_reply(req, "", 0, 0); |
113 | } | |
114 | ||
115 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
116 | * problems; however, we need it fixed, because it is expected that UML users | |
117 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
118 | * show the real procfs content, not the ones from hppfs.*/ | |
119 | #if 0 | |
120 | void mconsole_proc(struct mc_request *req) | |
121 | { | |
122 | struct nameidata nd; | |
123 | struct file_system_type *proc; | |
124 | struct super_block *super; | |
125 | struct file *file; | |
126 | int n, err; | |
127 | char *ptr = req->request.data, *buf; | |
128 | ||
129 | ptr += strlen("proc"); | |
ae2587e4 | 130 | while (isspace(*ptr)) ptr++; |
1da177e4 LT |
131 | |
132 | proc = get_fs_type("proc"); | |
ae2587e4 | 133 | if (proc == NULL) { |
1da177e4 LT |
134 | mconsole_reply(req, "procfs not registered", 1, 0); |
135 | goto out; | |
136 | } | |
137 | ||
138 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
139 | put_filesystem(proc); | |
ae2587e4 | 140 | if (super == NULL) { |
1da177e4 LT |
141 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
142 | goto out; | |
143 | } | |
144 | up_write(&super->s_umount); | |
145 | ||
146 | nd.dentry = super->s_root; | |
147 | nd.mnt = NULL; | |
148 | nd.flags = O_RDONLY + 1; | |
149 | nd.last_type = LAST_ROOT; | |
150 | ||
151 | /* START: it was experienced that the stability problems are closed | |
152 | * if commenting out these two calls + the below read cycle. To | |
153 | * make UML crash again, it was enough to readd either one.*/ | |
154 | err = link_path_walk(ptr, &nd); | |
ae2587e4 | 155 | if (err) { |
1da177e4 LT |
156 | mconsole_reply(req, "Failed to look up file", 1, 0); |
157 | goto out_kill; | |
158 | } | |
159 | ||
160 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); | |
ae2587e4 | 161 | if (IS_ERR(file)) { |
1da177e4 LT |
162 | mconsole_reply(req, "Failed to open file", 1, 0); |
163 | goto out_kill; | |
164 | } | |
165 | /*END*/ | |
166 | ||
167 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 168 | if (buf == NULL) { |
1da177e4 LT |
169 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
170 | goto out_fput; | |
171 | } | |
172 | ||
ae2587e4 | 173 | if ((file->f_op != NULL) && (file->f_op->read != NULL)) { |
1da177e4 LT |
174 | do { |
175 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
176 | &file->f_pos); | |
ae2587e4 | 177 | if (n >= 0) { |
1da177e4 LT |
178 | buf[n] = '\0'; |
179 | mconsole_reply(req, buf, 0, (n > 0)); | |
180 | } | |
181 | else { | |
182 | mconsole_reply(req, "Read of file failed", | |
183 | 1, 0); | |
184 | goto out_free; | |
185 | } | |
ae2587e4 | 186 | } while (n > 0); |
1da177e4 LT |
187 | } |
188 | else mconsole_reply(req, "", 0, 0); | |
189 | ||
190 | out_free: | |
191 | kfree(buf); | |
192 | out_fput: | |
193 | fput(file); | |
194 | out_kill: | |
195 | deactivate_super(super); | |
196 | out: ; | |
197 | } | |
198 | #endif | |
199 | ||
200 | void mconsole_proc(struct mc_request *req) | |
201 | { | |
202 | char path[64]; | |
203 | char *buf; | |
204 | int len; | |
205 | int fd; | |
206 | int first_chunk = 1; | |
207 | char *ptr = req->request.data; | |
208 | ||
209 | ptr += strlen("proc"); | |
ae2587e4 JD |
210 | while (isspace(*ptr)) |
211 | ptr++; | |
1da177e4 LT |
212 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
213 | ||
214 | fd = sys_open(path, 0, 0); | |
215 | if (fd < 0) { | |
216 | mconsole_reply(req, "Failed to open file", 1, 0); | |
ae2587e4 | 217 | printk(KERN_ERR "open %s: %d\n",path,fd); |
1da177e4 LT |
218 | goto out; |
219 | } | |
220 | ||
221 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 222 | if (buf == NULL) { |
1da177e4 LT |
223 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
224 | goto out_close; | |
225 | } | |
226 | ||
227 | for (;;) { | |
228 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
229 | if (len < 0) { | |
230 | mconsole_reply(req, "Read of file failed", 1, 0); | |
231 | goto out_free; | |
232 | } | |
ae2587e4 | 233 | /* Begin the file content on his own line. */ |
1da177e4 LT |
234 | if (first_chunk) { |
235 | mconsole_reply(req, "\n", 0, 1); | |
236 | first_chunk = 0; | |
237 | } | |
238 | if (len == PAGE_SIZE-1) { | |
239 | buf[len] = '\0'; | |
240 | mconsole_reply(req, buf, 0, 1); | |
241 | } else { | |
242 | buf[len] = '\0'; | |
243 | mconsole_reply(req, buf, 0, 0); | |
244 | break; | |
245 | } | |
246 | } | |
247 | ||
248 | out_free: | |
249 | kfree(buf); | |
250 | out_close: | |
251 | sys_close(fd); | |
252 | out: | |
253 | /* nothing */; | |
254 | } | |
255 | ||
256 | #define UML_MCONSOLE_HELPTEXT \ | |
257 | "Commands: \n\ | |
258 | version - Get kernel version \n\ | |
259 | help - Print this message \n\ | |
260 | halt - Halt UML \n\ | |
261 | reboot - Reboot UML \n\ | |
262 | config <dev>=<config> - Add a new device to UML; \n\ | |
263 | same syntax as command line \n\ | |
264 | config <dev> - Query the configuration of a device \n\ | |
265 | remove <dev> - Remove a device from UML \n\ | |
266 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 267 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
268 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
269 | go - continue the UML after a 'stop' \n\ | |
270 | log <string> - make UML enter <string> into the kernel log\n\ | |
271 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 272 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
273 | " |
274 | ||
275 | void mconsole_help(struct mc_request *req) | |
276 | { | |
277 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
278 | } | |
279 | ||
280 | void mconsole_halt(struct mc_request *req) | |
281 | { | |
282 | mconsole_reply(req, "", 0, 0); | |
283 | machine_halt(); | |
284 | } | |
285 | ||
286 | void mconsole_reboot(struct mc_request *req) | |
287 | { | |
288 | mconsole_reply(req, "", 0, 0); | |
289 | machine_restart(NULL); | |
290 | } | |
291 | ||
1da177e4 LT |
292 | void mconsole_cad(struct mc_request *req) |
293 | { | |
294 | mconsole_reply(req, "", 0, 0); | |
295 | ctrl_alt_del(); | |
296 | } | |
297 | ||
298 | void mconsole_go(struct mc_request *req) | |
299 | { | |
300 | mconsole_reply(req, "Not stopped", 1, 0); | |
301 | } | |
302 | ||
303 | void mconsole_stop(struct mc_request *req) | |
304 | { | |
305 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
306 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d AV |
307 | mconsole_reply(req, "stopped", 0, 0); |
308 | while (mconsole_get_request(req->originating_fd, req)) { | |
309 | if (req->cmd->handler == mconsole_go) | |
310 | break; | |
311 | if (req->cmd->handler == mconsole_stop) { | |
312 | mconsole_reply(req, "Already stopped", 1, 0); | |
313 | continue; | |
314 | } | |
315 | if (req->cmd->handler == mconsole_sysrq) { | |
316 | struct pt_regs *old_regs; | |
317 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
318 | mconsole_sysrq(req); | |
319 | set_irq_regs(old_regs); | |
320 | continue; | |
321 | } | |
1da177e4 LT |
322 | (*req->cmd->handler)(req); |
323 | } | |
324 | os_set_fd_block(req->originating_fd, 0); | |
325 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
326 | mconsole_reply(req, "", 0, 0); | |
327 | } | |
328 | ||
84f48d4f | 329 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 330 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
331 | |
332 | void mconsole_register_dev(struct mc_device *new) | |
333 | { | |
84f48d4f JD |
334 | spin_lock(&mc_devices_lock); |
335 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 336 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 337 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
338 | } |
339 | ||
340 | static struct mc_device *mconsole_find_dev(char *name) | |
341 | { | |
342 | struct list_head *ele; | |
343 | struct mc_device *dev; | |
344 | ||
ae2587e4 | 345 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 346 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
347 | if (!strncmp(name, dev->name, strlen(dev->name))) |
348 | return dev; | |
1da177e4 | 349 | } |
ae2587e4 | 350 | return NULL; |
1da177e4 LT |
351 | } |
352 | ||
02dea087 JD |
353 | #define UNPLUGGED_PER_PAGE \ |
354 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
355 | ||
356 | struct unplugged_pages { | |
357 | struct list_head list; | |
358 | void *pages[UNPLUGGED_PER_PAGE]; | |
359 | }; | |
360 | ||
84f48d4f | 361 | static DECLARE_MUTEX(plug_mem_mutex); |
02dea087 | 362 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 363 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
364 | static int unplug_index = UNPLUGGED_PER_PAGE; |
365 | ||
f28169d2 | 366 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
367 | { |
368 | unsigned long long diff; | |
369 | int err = -EINVAL, i, add; | |
370 | char *ret; | |
371 | ||
ae2587e4 | 372 | if (str[0] != '=') { |
f28169d2 | 373 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 374 | goto out; |
f28169d2 | 375 | } |
02dea087 JD |
376 | |
377 | str++; | |
ae2587e4 | 378 | if (str[0] == '-') |
02dea087 | 379 | add = 0; |
ae2587e4 | 380 | else if (str[0] == '+') { |
02dea087 JD |
381 | add = 1; |
382 | } | |
f28169d2 JD |
383 | else { |
384 | *error_out = "Expected increment to start with '-' or '+'"; | |
385 | goto out; | |
386 | } | |
02dea087 JD |
387 | |
388 | str++; | |
389 | diff = memparse(str, &ret); | |
ae2587e4 | 390 | if (*ret != '\0') { |
f28169d2 | 391 | *error_out = "Failed to parse memory increment"; |
02dea087 | 392 | goto out; |
f28169d2 | 393 | } |
02dea087 JD |
394 | |
395 | diff /= PAGE_SIZE; | |
396 | ||
84f48d4f | 397 | down(&plug_mem_mutex); |
ae2587e4 | 398 | for (i = 0; i < diff; i++) { |
02dea087 JD |
399 | struct unplugged_pages *unplugged; |
400 | void *addr; | |
401 | ||
ae2587e4 JD |
402 | if (add) { |
403 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
404 | break; |
405 | ||
406 | unplugged = list_entry(unplugged_pages.next, | |
407 | struct unplugged_pages, list); | |
ae2587e4 | 408 | if (unplug_index > 0) |
02dea087 JD |
409 | addr = unplugged->pages[--unplug_index]; |
410 | else { | |
411 | list_del(&unplugged->list); | |
412 | addr = unplugged; | |
413 | unplug_index = UNPLUGGED_PER_PAGE; | |
414 | } | |
415 | ||
416 | free_page((unsigned long) addr); | |
417 | unplugged_pages_count--; | |
418 | } | |
419 | else { | |
420 | struct page *page; | |
421 | ||
422 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 423 | if (page == NULL) |
02dea087 JD |
424 | break; |
425 | ||
426 | unplugged = page_address(page); | |
ae2587e4 | 427 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
428 | list_add(&unplugged->list, &unplugged_pages); |
429 | unplug_index = 0; | |
430 | } | |
431 | else { | |
432 | struct list_head *entry = unplugged_pages.next; | |
433 | addr = unplugged; | |
434 | ||
435 | unplugged = list_entry(entry, | |
436 | struct unplugged_pages, | |
437 | list); | |
02dea087 | 438 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
439 | if (err) { |
440 | printk(KERN_ERR "Failed to release " | |
441 | "memory - errno = %d\n", err); | |
f28169d2 | 442 | *error_out = "Failed to release memory"; |
84f48d4f | 443 | goto out_unlock; |
f28169d2 JD |
444 | } |
445 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
446 | } |
447 | ||
448 | unplugged_pages_count++; | |
449 | } | |
450 | } | |
451 | ||
452 | err = 0; | |
84f48d4f JD |
453 | out_unlock: |
454 | up(&plug_mem_mutex); | |
02dea087 JD |
455 | out: |
456 | return err; | |
457 | } | |
458 | ||
459 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
460 | { | |
461 | char buf[sizeof("18446744073709551615")]; | |
462 | int len = 0; | |
463 | ||
464 | sprintf(buf, "%ld", uml_physmem); | |
465 | CONFIG_CHUNK(str, size, len, buf, 1); | |
466 | ||
467 | return len; | |
468 | } | |
469 | ||
470 | static int mem_id(char **str, int *start_out, int *end_out) | |
471 | { | |
472 | *start_out = 0; | |
473 | *end_out = 0; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
f28169d2 | 478 | static int mem_remove(int n, char **error_out) |
02dea087 | 479 | { |
f28169d2 | 480 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
481 | return -EBUSY; |
482 | } | |
483 | ||
484 | static struct mc_device mem_mc = { | |
84f48d4f | 485 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
486 | .name = "mem", |
487 | .config = mem_config, | |
488 | .get_config = mem_get_config, | |
489 | .id = mem_id, | |
490 | .remove = mem_remove, | |
491 | }; | |
492 | ||
97a1fcbb | 493 | static int __init mem_mc_init(void) |
02dea087 | 494 | { |
ae2587e4 | 495 | if (can_drop_memory()) |
02dea087 | 496 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
497 | else printk(KERN_ERR "Can't release memory to the host - memory " |
498 | "hotplug won't be supported\n"); | |
02dea087 JD |
499 | return 0; |
500 | } | |
501 | ||
502 | __initcall(mem_mc_init); | |
503 | ||
1da177e4 LT |
504 | #define CONFIG_BUF_SIZE 64 |
505 | ||
d50084a2 | 506 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
507 | char **), |
508 | struct mc_request *req, char *name) | |
509 | { | |
510 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
511 | int n, size; | |
512 | ||
ae2587e4 | 513 | if (get_config == NULL) { |
1da177e4 LT |
514 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
515 | return; | |
516 | } | |
517 | ||
518 | error = NULL; | |
91b165c0 | 519 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
520 | buf = default_buf; |
521 | ||
ae2587e4 | 522 | while (1) { |
1da177e4 | 523 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 524 | if (error != NULL) { |
1da177e4 LT |
525 | mconsole_reply(req, error, 1, 0); |
526 | goto out; | |
527 | } | |
528 | ||
ae2587e4 | 529 | if (n <= size) { |
1da177e4 LT |
530 | mconsole_reply(req, buf, 0, 0); |
531 | goto out; | |
532 | } | |
533 | ||
ae2587e4 | 534 | if (buf != default_buf) |
1da177e4 LT |
535 | kfree(buf); |
536 | ||
537 | size = n; | |
538 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 539 | if (buf == NULL) { |
1da177e4 LT |
540 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
541 | return; | |
542 | } | |
543 | } | |
544 | out: | |
ae2587e4 | 545 | if (buf != default_buf) |
1da177e4 | 546 | kfree(buf); |
1da177e4 LT |
547 | } |
548 | ||
549 | void mconsole_config(struct mc_request *req) | |
550 | { | |
551 | struct mc_device *dev; | |
f28169d2 | 552 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
553 | int err; |
554 | ||
555 | ptr += strlen("config"); | |
ae2587e4 JD |
556 | while (isspace(*ptr)) |
557 | ptr++; | |
1da177e4 | 558 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 559 | if (dev == NULL) { |
1da177e4 LT |
560 | mconsole_reply(req, "Bad configuration option", 1, 0); |
561 | return; | |
562 | } | |
563 | ||
564 | name = &ptr[strlen(dev->name)]; | |
565 | ptr = name; | |
ae2587e4 | 566 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
567 | ptr++; |
568 | ||
ae2587e4 | 569 | if (*ptr == '=') { |
f28169d2 JD |
570 | err = (*dev->config)(name, &error_string); |
571 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
572 | } |
573 | else mconsole_get_config(dev->get_config, req, name); | |
574 | } | |
575 | ||
576 | void mconsole_remove(struct mc_request *req) | |
577 | { | |
d50084a2 | 578 | struct mc_device *dev; |
29d56cfe | 579 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 580 | char error[256]; |
29d56cfe | 581 | int err, start, end, n; |
1da177e4 LT |
582 | |
583 | ptr += strlen("remove"); | |
ae2587e4 | 584 | while (isspace(*ptr)) ptr++; |
1da177e4 | 585 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 586 | if (dev == NULL) { |
1da177e4 LT |
587 | mconsole_reply(req, "Bad remove option", 1, 0); |
588 | return; | |
589 | } | |
29d56cfe | 590 | |
3a331a51 JD |
591 | ptr = &ptr[strlen(dev->name)]; |
592 | ||
593 | err = 1; | |
594 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 595 | if (n < 0) { |
3a331a51 JD |
596 | err_msg = "Couldn't parse device number"; |
597 | goto out; | |
598 | } | |
ae2587e4 | 599 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
600 | sprintf(error, "Invalid device number - must be between " |
601 | "%d and %d", start, end); | |
602 | err_msg = error; | |
603 | goto out; | |
604 | } | |
29d56cfe | 605 | |
f28169d2 JD |
606 | err_msg = NULL; |
607 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 608 | switch(err) { |
d40f6d71 JD |
609 | case 0: |
610 | err_msg = ""; | |
611 | break; | |
3a331a51 | 612 | case -ENODEV: |
ae2587e4 | 613 | if (err_msg == NULL) |
f28169d2 | 614 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
615 | break; |
616 | case -EBUSY: | |
ae2587e4 | 617 | if (err_msg == NULL) |
f28169d2 | 618 | err_msg = "Device is currently open"; |
3a331a51 JD |
619 | break; |
620 | default: | |
621 | break; | |
622 | } | |
623 | out: | |
29d56cfe | 624 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
625 | } |
626 | ||
f92afe56 JD |
627 | struct mconsole_output { |
628 | struct list_head list; | |
629 | struct mc_request *req; | |
630 | }; | |
631 | ||
84f48d4f | 632 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
633 | static LIST_HEAD(clients); |
634 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
635 | |
636 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 637 | unsigned int len) |
6f517d3f JD |
638 | { |
639 | struct list_head *ele; | |
640 | int n; | |
641 | ||
ae2587e4 | 642 | if (list_empty(&clients)) |
6f517d3f JD |
643 | return; |
644 | ||
54fa0ba4 JD |
645 | while (len > 0) { |
646 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
647 | strncpy(console_buf, string, n); | |
6f517d3f JD |
648 | string += n; |
649 | len -= n; | |
6f517d3f | 650 | |
ae2587e4 | 651 | list_for_each(ele, &clients) { |
f92afe56 | 652 | struct mconsole_output *entry; |
6f517d3f | 653 | |
f92afe56 | 654 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 655 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 656 | } |
6f517d3f JD |
657 | } |
658 | } | |
659 | ||
660 | static struct console mc_console = { .name = "mc", | |
661 | .write = console_write, | |
a174b30e | 662 | .flags = CON_ENABLED, |
6f517d3f JD |
663 | .index = -1 }; |
664 | ||
665 | static int mc_add_console(void) | |
666 | { | |
667 | register_console(&mc_console); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | late_initcall(mc_add_console); | |
672 | ||
673 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
674 | void *arg) | |
675 | { | |
f92afe56 | 676 | struct mconsole_output entry; |
6f517d3f JD |
677 | unsigned long flags; |
678 | ||
f92afe56 | 679 | entry.req = req; |
84f48d4f | 680 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 681 | list_add(&entry.list, &clients); |
84f48d4f | 682 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
683 | |
684 | (*proc)(arg); | |
685 | ||
54fa0ba4 | 686 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 687 | |
84f48d4f | 688 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 689 | list_del(&entry.list); |
84f48d4f | 690 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
691 | } |
692 | ||
4111b025 | 693 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
694 | |
695 | #include <linux/sysrq.h> | |
696 | ||
4111b025 JD |
697 | static void sysrq_proc(void *arg) |
698 | { | |
699 | char *op = arg; | |
7bea96fd | 700 | handle_sysrq(*op, NULL); |
4111b025 JD |
701 | } |
702 | ||
703 | void mconsole_sysrq(struct mc_request *req) | |
704 | { | |
705 | char *ptr = req->request.data; | |
706 | ||
707 | ptr += strlen("sysrq"); | |
ae2587e4 | 708 | while (isspace(*ptr)) ptr++; |
4111b025 | 709 | |
ae2587e4 JD |
710 | /* |
711 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
712 | * so in this case, we reply first. |
713 | */ | |
ae2587e4 | 714 | if (*ptr == 'b') |
4111b025 JD |
715 | mconsole_reply(req, "", 0, 0); |
716 | ||
717 | with_console(req, sysrq_proc, ptr); | |
718 | } | |
719 | #else | |
720 | void mconsole_sysrq(struct mc_request *req) | |
721 | { | |
722 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
723 | } | |
724 | #endif | |
725 | ||
6f517d3f JD |
726 | static void stack_proc(void *arg) |
727 | { | |
728 | struct task_struct *from = current, *to = arg; | |
729 | ||
730 | to->thread.saved_task = from; | |
731 | switch_to(from, to, from); | |
732 | } | |
733 | ||
ae2587e4 JD |
734 | /* |
735 | * Mconsole stack trace | |
3eddddcf JD |
736 | * Added by Allan Graves, Jeff Dike |
737 | * Dumps a stacks registers to the linux console. | |
738 | * Usage stack <pid>. | |
739 | */ | |
42fda663 | 740 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 741 | { |
3a331a51 JD |
742 | char *ptr = req->request.data; |
743 | int pid_requested= -1; | |
3eddddcf JD |
744 | struct task_struct *to = NULL; |
745 | ||
ae2587e4 JD |
746 | /* |
747 | * Would be nice: | |
3a331a51 | 748 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
749 | * 2) Add a way to stack dump all pids. |
750 | */ | |
751 | ||
3a331a51 | 752 | ptr += strlen("stack"); |
ae2587e4 JD |
753 | while (isspace(*ptr)) |
754 | ptr++; | |
3eddddcf | 755 | |
ae2587e4 JD |
756 | /* |
757 | * Should really check for multiple pids or reject bad args here | |
758 | */ | |
3a331a51 | 759 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 760 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
761 | mconsole_reply(req, "Please specify a pid", 1, 0); |
762 | return; | |
763 | } | |
3eddddcf | 764 | |
6f517d3f | 765 | to = find_task_by_pid(pid_requested); |
ae2587e4 | 766 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
767 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
768 | return; | |
769 | } | |
6f517d3f | 770 | with_console(req, stack_proc, to); |
3eddddcf | 771 | } |
3eddddcf | 772 | |
ae2587e4 JD |
773 | /* |
774 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
775 | * active. |
776 | */ | |
d50084a2 | 777 | static char *notify_socket = NULL; |
1da177e4 | 778 | |
97a1fcbb | 779 | static int __init mconsole_init(void) |
1da177e4 LT |
780 | { |
781 | /* long to avoid size mismatch warnings from gcc */ | |
782 | long sock; | |
783 | int err; | |
784 | char file[256]; | |
785 | ||
ae2587e4 JD |
786 | if (umid_file_name("mconsole", file, sizeof(file))) |
787 | return -1; | |
1da177e4 LT |
788 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
789 | ||
790 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
791 | if (sock < 0) { |
792 | printk(KERN_ERR "Failed to initialize management console\n"); | |
793 | return 1; | |
1da177e4 LT |
794 | } |
795 | ||
796 | register_reboot_notifier(&reboot_notifier); | |
797 | ||
798 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 799 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 800 | "mconsole", (void *)sock); |
ae2587e4 JD |
801 | if (err) { |
802 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
803 | return 1; | |
1da177e4 LT |
804 | } |
805 | ||
ae2587e4 | 806 | if (notify_socket != NULL) { |
970d6e3a | 807 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 808 | if (notify_socket != NULL) |
1da177e4 | 809 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 810 | mconsole_socket_name, |
1da177e4 LT |
811 | strlen(mconsole_socket_name) + 1); |
812 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
813 | "string\n"); | |
814 | } | |
815 | ||
ae2587e4 | 816 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 817 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 818 | return 0; |
1da177e4 LT |
819 | } |
820 | ||
821 | __initcall(mconsole_init); | |
822 | ||
823 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
824 | unsigned long count, void *data) | |
825 | { | |
826 | char *buf; | |
827 | ||
828 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
829 | if (buf == NULL) |
830 | return -ENOMEM; | |
1da177e4 | 831 | |
ae2587e4 | 832 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
833 | count = -EFAULT; |
834 | goto out; | |
835 | } | |
836 | ||
837 | buf[count] = '\0'; | |
838 | ||
839 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
840 | out: | |
841 | kfree(buf); | |
ae2587e4 | 842 | return count; |
1da177e4 LT |
843 | } |
844 | ||
845 | static int create_proc_mconsole(void) | |
846 | { | |
847 | struct proc_dir_entry *ent; | |
848 | ||
ae2587e4 JD |
849 | if (notify_socket == NULL) |
850 | return 0; | |
1da177e4 LT |
851 | |
852 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
ae2587e4 JD |
853 | if (ent == NULL) { |
854 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
855 | "failed\n"); | |
856 | return 0; | |
1da177e4 LT |
857 | } |
858 | ||
859 | ent->read_proc = NULL; | |
860 | ent->write_proc = write_proc_mconsole; | |
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); |