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Commit | Line | Data |
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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> | |
19 | #include <linux/workqueue.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <asm/uaccess.h> | |
22 | ||
ae2587e4 JD |
23 | #include "init.h" |
24 | #include "irq_kern.h" | |
25 | #include "irq_user.h" | |
1da177e4 | 26 | #include "kern_util.h" |
1da177e4 LT |
27 | #include "mconsole.h" |
28 | #include "mconsole_kern.h" | |
1da177e4 | 29 | #include "os.h" |
1da177e4 | 30 | |
d50084a2 | 31 | static int do_unlink_socket(struct notifier_block *notifier, |
1da177e4 LT |
32 | unsigned long what, void *data) |
33 | { | |
ae2587e4 | 34 | return mconsole_unlink_socket(); |
1da177e4 LT |
35 | } |
36 | ||
37 | ||
38 | static struct notifier_block reboot_notifier = { | |
39 | .notifier_call = do_unlink_socket, | |
40 | .priority = 0, | |
41 | }; | |
42 | ||
d50084a2 | 43 | /* Safe without explicit locking for now. Tasklets provide their own |
1da177e4 LT |
44 | * locking, and the interrupt handler is safe because it can't interrupt |
45 | * itself and it can only happen on CPU 0. | |
46 | */ | |
47 | ||
9010772c | 48 | static LIST_HEAD(mc_requests); |
1da177e4 | 49 | |
6d5aefb8 | 50 | static void mc_work_proc(struct work_struct *unused) |
1da177e4 LT |
51 | { |
52 | struct mconsole_entry *req; | |
53 | unsigned long flags; | |
54 | ||
ae2587e4 | 55 | while (!list_empty(&mc_requests)) { |
dbdb4c06 | 56 | local_irq_save(flags); |
ae2587e4 | 57 | req = list_entry(mc_requests.next, struct mconsole_entry, list); |
1da177e4 LT |
58 | list_del(&req->list); |
59 | local_irq_restore(flags); | |
60 | req->request.cmd->handler(&req->request); | |
61 | kfree(req); | |
62 | } | |
63 | } | |
64 | ||
6d5aefb8 | 65 | static DECLARE_WORK(mconsole_work, mc_work_proc); |
1da177e4 | 66 | |
7bea96fd | 67 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id) |
1da177e4 LT |
68 | { |
69 | /* long to avoid size mismatch warnings from gcc */ | |
70 | long fd; | |
71 | struct mconsole_entry *new; | |
3a51237d | 72 | static struct mc_request req; /* that's OK */ |
1da177e4 LT |
73 | |
74 | fd = (long) dev_id; | |
ae2587e4 JD |
75 | while (mconsole_get_request(fd, &req)) { |
76 | if (req.cmd->context == MCONSOLE_INTR) | |
1da177e4 LT |
77 | (*req.cmd->handler)(&req); |
78 | else { | |
60baa158 | 79 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
ae2587e4 | 80 | if (new == NULL) |
1da177e4 LT |
81 | mconsole_reply(&req, "Out of memory", 1, 0); |
82 | else { | |
83 | new->request = req; | |
3a51237d | 84 | new->request.regs = get_irq_regs()->regs; |
1da177e4 LT |
85 | list_add(&new->list, &mc_requests); |
86 | } | |
87 | } | |
88 | } | |
ae2587e4 | 89 | if (!list_empty(&mc_requests)) |
1da177e4 LT |
90 | schedule_work(&mconsole_work); |
91 | reactivate_fd(fd, MCONSOLE_IRQ); | |
ae2587e4 | 92 | return IRQ_HANDLED; |
1da177e4 LT |
93 | } |
94 | ||
95 | void mconsole_version(struct mc_request *req) | |
96 | { | |
97 | char version[256]; | |
98 | ||
e9ff3990 | 99 | sprintf(version, "%s %s %s %s %s", utsname()->sysname, |
ae2587e4 JD |
100 | utsname()->nodename, utsname()->release, utsname()->version, |
101 | utsname()->machine); | |
1da177e4 LT |
102 | mconsole_reply(req, version, 0, 0); |
103 | } | |
104 | ||
105 | void mconsole_log(struct mc_request *req) | |
106 | { | |
107 | int len; | |
108 | char *ptr = req->request.data; | |
109 | ||
110 | ptr += strlen("log "); | |
111 | ||
112 | len = req->len - (ptr - req->request.data); | |
ae2587e4 | 113 | printk(KERN_WARNING "%.*s", len, ptr); |
1da177e4 LT |
114 | mconsole_reply(req, "", 0, 0); |
115 | } | |
116 | ||
117 | /* This is a more convoluted version of mconsole_proc, which has some stability | |
118 | * problems; however, we need it fixed, because it is expected that UML users | |
119 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still | |
120 | * show the real procfs content, not the ones from hppfs.*/ | |
121 | #if 0 | |
122 | void mconsole_proc(struct mc_request *req) | |
123 | { | |
124 | struct nameidata nd; | |
125 | struct file_system_type *proc; | |
126 | struct super_block *super; | |
127 | struct file *file; | |
128 | int n, err; | |
129 | char *ptr = req->request.data, *buf; | |
130 | ||
131 | ptr += strlen("proc"); | |
ae2587e4 | 132 | while (isspace(*ptr)) ptr++; |
1da177e4 LT |
133 | |
134 | proc = get_fs_type("proc"); | |
ae2587e4 | 135 | if (proc == NULL) { |
1da177e4 LT |
136 | mconsole_reply(req, "procfs not registered", 1, 0); |
137 | goto out; | |
138 | } | |
139 | ||
140 | super = (*proc->get_sb)(proc, 0, NULL, NULL); | |
141 | put_filesystem(proc); | |
ae2587e4 | 142 | if (super == NULL) { |
1da177e4 LT |
143 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
144 | goto out; | |
145 | } | |
146 | up_write(&super->s_umount); | |
147 | ||
4ac91378 JB |
148 | nd.path.dentry = super->s_root; |
149 | nd.path.mnt = NULL; | |
1da177e4 LT |
150 | nd.flags = O_RDONLY + 1; |
151 | nd.last_type = LAST_ROOT; | |
152 | ||
153 | /* START: it was experienced that the stability problems are closed | |
154 | * if commenting out these two calls + the below read cycle. To | |
155 | * make UML crash again, it was enough to readd either one.*/ | |
156 | err = link_path_walk(ptr, &nd); | |
ae2587e4 | 157 | if (err) { |
1da177e4 LT |
158 | mconsole_reply(req, "Failed to look up file", 1, 0); |
159 | goto out_kill; | |
160 | } | |
161 | ||
4ac91378 | 162 | file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY); |
ae2587e4 | 163 | if (IS_ERR(file)) { |
1da177e4 LT |
164 | mconsole_reply(req, "Failed to open file", 1, 0); |
165 | goto out_kill; | |
166 | } | |
167 | /*END*/ | |
168 | ||
169 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 170 | if (buf == NULL) { |
1da177e4 LT |
171 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
172 | goto out_fput; | |
173 | } | |
174 | ||
ae2587e4 | 175 | if ((file->f_op != NULL) && (file->f_op->read != NULL)) { |
1da177e4 LT |
176 | do { |
177 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, | |
178 | &file->f_pos); | |
ae2587e4 | 179 | if (n >= 0) { |
1da177e4 LT |
180 | buf[n] = '\0'; |
181 | mconsole_reply(req, buf, 0, (n > 0)); | |
182 | } | |
183 | else { | |
184 | mconsole_reply(req, "Read of file failed", | |
185 | 1, 0); | |
186 | goto out_free; | |
187 | } | |
ae2587e4 | 188 | } while (n > 0); |
1da177e4 LT |
189 | } |
190 | else mconsole_reply(req, "", 0, 0); | |
191 | ||
192 | out_free: | |
193 | kfree(buf); | |
194 | out_fput: | |
195 | fput(file); | |
196 | out_kill: | |
197 | deactivate_super(super); | |
198 | out: ; | |
199 | } | |
200 | #endif | |
201 | ||
202 | void mconsole_proc(struct mc_request *req) | |
203 | { | |
204 | char path[64]; | |
205 | char *buf; | |
206 | int len; | |
207 | int fd; | |
208 | int first_chunk = 1; | |
209 | char *ptr = req->request.data; | |
210 | ||
211 | ptr += strlen("proc"); | |
ae2587e4 JD |
212 | while (isspace(*ptr)) |
213 | ptr++; | |
1da177e4 LT |
214 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
215 | ||
216 | fd = sys_open(path, 0, 0); | |
217 | if (fd < 0) { | |
218 | mconsole_reply(req, "Failed to open file", 1, 0); | |
ae2587e4 | 219 | printk(KERN_ERR "open %s: %d\n",path,fd); |
1da177e4 LT |
220 | goto out; |
221 | } | |
222 | ||
223 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
ae2587e4 | 224 | if (buf == NULL) { |
1da177e4 LT |
225 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
226 | goto out_close; | |
227 | } | |
228 | ||
229 | for (;;) { | |
230 | len = sys_read(fd, buf, PAGE_SIZE-1); | |
231 | if (len < 0) { | |
232 | mconsole_reply(req, "Read of file failed", 1, 0); | |
233 | goto out_free; | |
234 | } | |
ae2587e4 | 235 | /* Begin the file content on his own line. */ |
1da177e4 LT |
236 | if (first_chunk) { |
237 | mconsole_reply(req, "\n", 0, 1); | |
238 | first_chunk = 0; | |
239 | } | |
240 | if (len == PAGE_SIZE-1) { | |
241 | buf[len] = '\0'; | |
242 | mconsole_reply(req, buf, 0, 1); | |
243 | } else { | |
244 | buf[len] = '\0'; | |
245 | mconsole_reply(req, buf, 0, 0); | |
246 | break; | |
247 | } | |
248 | } | |
249 | ||
250 | out_free: | |
251 | kfree(buf); | |
252 | out_close: | |
253 | sys_close(fd); | |
254 | out: | |
255 | /* nothing */; | |
256 | } | |
257 | ||
258 | #define UML_MCONSOLE_HELPTEXT \ | |
259 | "Commands: \n\ | |
260 | version - Get kernel version \n\ | |
261 | help - Print this message \n\ | |
262 | halt - Halt UML \n\ | |
263 | reboot - Reboot UML \n\ | |
264 | config <dev>=<config> - Add a new device to UML; \n\ | |
265 | same syntax as command line \n\ | |
266 | config <dev> - Query the configuration of a device \n\ | |
267 | remove <dev> - Remove a device from UML \n\ | |
268 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ | |
db805812 | 269 | cad - invoke the Ctrl-Alt-Del handler \n\ |
1da177e4 LT |
270 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
271 | go - continue the UML after a 'stop' \n\ | |
272 | log <string> - make UML enter <string> into the kernel log\n\ | |
273 | proc <file> - returns the contents of the UML's /proc/<file>\n\ | |
3eddddcf | 274 | stack <pid> - returns the stack of the specified pid\n\ |
1da177e4 LT |
275 | " |
276 | ||
277 | void mconsole_help(struct mc_request *req) | |
278 | { | |
279 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); | |
280 | } | |
281 | ||
282 | void mconsole_halt(struct mc_request *req) | |
283 | { | |
284 | mconsole_reply(req, "", 0, 0); | |
285 | machine_halt(); | |
286 | } | |
287 | ||
288 | void mconsole_reboot(struct mc_request *req) | |
289 | { | |
290 | mconsole_reply(req, "", 0, 0); | |
291 | machine_restart(NULL); | |
292 | } | |
293 | ||
1da177e4 LT |
294 | void mconsole_cad(struct mc_request *req) |
295 | { | |
296 | mconsole_reply(req, "", 0, 0); | |
297 | ctrl_alt_del(); | |
298 | } | |
299 | ||
300 | void mconsole_go(struct mc_request *req) | |
301 | { | |
302 | mconsole_reply(req, "Not stopped", 1, 0); | |
303 | } | |
304 | ||
305 | void mconsole_stop(struct mc_request *req) | |
306 | { | |
307 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
308 | os_set_fd_block(req->originating_fd, 1); | |
3a51237d | 309 | mconsole_reply(req, "stopped", 0, 0); |
cc0be0fb KS |
310 | for (;;) { |
311 | if (!mconsole_get_request(req->originating_fd, req)) | |
312 | continue; | |
3a51237d AV |
313 | if (req->cmd->handler == mconsole_go) |
314 | break; | |
315 | if (req->cmd->handler == mconsole_stop) { | |
316 | mconsole_reply(req, "Already stopped", 1, 0); | |
317 | continue; | |
318 | } | |
319 | if (req->cmd->handler == mconsole_sysrq) { | |
320 | struct pt_regs *old_regs; | |
321 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
322 | mconsole_sysrq(req); | |
323 | set_irq_regs(old_regs); | |
324 | continue; | |
325 | } | |
1da177e4 LT |
326 | (*req->cmd->handler)(req); |
327 | } | |
328 | os_set_fd_block(req->originating_fd, 0); | |
329 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
330 | mconsole_reply(req, "", 0, 0); | |
331 | } | |
332 | ||
84f48d4f | 333 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 334 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
335 | |
336 | void mconsole_register_dev(struct mc_device *new) | |
337 | { | |
84f48d4f JD |
338 | spin_lock(&mc_devices_lock); |
339 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 340 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 341 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
342 | } |
343 | ||
344 | static struct mc_device *mconsole_find_dev(char *name) | |
345 | { | |
346 | struct list_head *ele; | |
347 | struct mc_device *dev; | |
348 | ||
ae2587e4 | 349 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 350 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
351 | if (!strncmp(name, dev->name, strlen(dev->name))) |
352 | return dev; | |
1da177e4 | 353 | } |
ae2587e4 | 354 | return NULL; |
1da177e4 LT |
355 | } |
356 | ||
02dea087 JD |
357 | #define UNPLUGGED_PER_PAGE \ |
358 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
359 | ||
360 | struct unplugged_pages { | |
361 | struct list_head list; | |
362 | void *pages[UNPLUGGED_PER_PAGE]; | |
363 | }; | |
364 | ||
e98fa281 | 365 | static DEFINE_MUTEX(plug_mem_mutex); |
02dea087 | 366 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 367 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
368 | static int unplug_index = UNPLUGGED_PER_PAGE; |
369 | ||
f28169d2 | 370 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
371 | { |
372 | unsigned long long diff; | |
373 | int err = -EINVAL, i, add; | |
374 | char *ret; | |
375 | ||
ae2587e4 | 376 | if (str[0] != '=') { |
f28169d2 | 377 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 378 | goto out; |
f28169d2 | 379 | } |
02dea087 JD |
380 | |
381 | str++; | |
ae2587e4 | 382 | if (str[0] == '-') |
02dea087 | 383 | add = 0; |
ae2587e4 | 384 | else if (str[0] == '+') { |
02dea087 JD |
385 | add = 1; |
386 | } | |
f28169d2 JD |
387 | else { |
388 | *error_out = "Expected increment to start with '-' or '+'"; | |
389 | goto out; | |
390 | } | |
02dea087 JD |
391 | |
392 | str++; | |
393 | diff = memparse(str, &ret); | |
ae2587e4 | 394 | if (*ret != '\0') { |
f28169d2 | 395 | *error_out = "Failed to parse memory increment"; |
02dea087 | 396 | goto out; |
f28169d2 | 397 | } |
02dea087 JD |
398 | |
399 | diff /= PAGE_SIZE; | |
400 | ||
e98fa281 | 401 | mutex_lock(&plug_mem_mutex); |
ae2587e4 | 402 | for (i = 0; i < diff; i++) { |
02dea087 JD |
403 | struct unplugged_pages *unplugged; |
404 | void *addr; | |
405 | ||
ae2587e4 JD |
406 | if (add) { |
407 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
408 | break; |
409 | ||
410 | unplugged = list_entry(unplugged_pages.next, | |
411 | struct unplugged_pages, list); | |
ae2587e4 | 412 | if (unplug_index > 0) |
02dea087 JD |
413 | addr = unplugged->pages[--unplug_index]; |
414 | else { | |
415 | list_del(&unplugged->list); | |
416 | addr = unplugged; | |
417 | unplug_index = UNPLUGGED_PER_PAGE; | |
418 | } | |
419 | ||
420 | free_page((unsigned long) addr); | |
421 | unplugged_pages_count--; | |
422 | } | |
423 | else { | |
424 | struct page *page; | |
425 | ||
426 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 427 | if (page == NULL) |
02dea087 JD |
428 | break; |
429 | ||
430 | unplugged = page_address(page); | |
ae2587e4 | 431 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
432 | list_add(&unplugged->list, &unplugged_pages); |
433 | unplug_index = 0; | |
434 | } | |
435 | else { | |
436 | struct list_head *entry = unplugged_pages.next; | |
437 | addr = unplugged; | |
438 | ||
439 | unplugged = list_entry(entry, | |
440 | struct unplugged_pages, | |
441 | list); | |
02dea087 | 442 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
443 | if (err) { |
444 | printk(KERN_ERR "Failed to release " | |
445 | "memory - errno = %d\n", err); | |
f28169d2 | 446 | *error_out = "Failed to release memory"; |
84f48d4f | 447 | goto out_unlock; |
f28169d2 JD |
448 | } |
449 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
450 | } |
451 | ||
452 | unplugged_pages_count++; | |
453 | } | |
454 | } | |
455 | ||
456 | err = 0; | |
84f48d4f | 457 | out_unlock: |
e98fa281 | 458 | mutex_unlock(&plug_mem_mutex); |
02dea087 JD |
459 | out: |
460 | return err; | |
461 | } | |
462 | ||
463 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
464 | { | |
465 | char buf[sizeof("18446744073709551615")]; | |
466 | int len = 0; | |
467 | ||
468 | sprintf(buf, "%ld", uml_physmem); | |
469 | CONFIG_CHUNK(str, size, len, buf, 1); | |
470 | ||
471 | return len; | |
472 | } | |
473 | ||
474 | static int mem_id(char **str, int *start_out, int *end_out) | |
475 | { | |
476 | *start_out = 0; | |
477 | *end_out = 0; | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
f28169d2 | 482 | static int mem_remove(int n, char **error_out) |
02dea087 | 483 | { |
f28169d2 | 484 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
485 | return -EBUSY; |
486 | } | |
487 | ||
488 | static struct mc_device mem_mc = { | |
84f48d4f | 489 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
490 | .name = "mem", |
491 | .config = mem_config, | |
492 | .get_config = mem_get_config, | |
493 | .id = mem_id, | |
494 | .remove = mem_remove, | |
495 | }; | |
496 | ||
97a1fcbb | 497 | static int __init mem_mc_init(void) |
02dea087 | 498 | { |
ae2587e4 | 499 | if (can_drop_memory()) |
02dea087 | 500 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
501 | else printk(KERN_ERR "Can't release memory to the host - memory " |
502 | "hotplug won't be supported\n"); | |
02dea087 JD |
503 | return 0; |
504 | } | |
505 | ||
506 | __initcall(mem_mc_init); | |
507 | ||
1da177e4 LT |
508 | #define CONFIG_BUF_SIZE 64 |
509 | ||
d50084a2 | 510 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
511 | char **), |
512 | struct mc_request *req, char *name) | |
513 | { | |
514 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
515 | int n, size; | |
516 | ||
ae2587e4 | 517 | if (get_config == NULL) { |
1da177e4 LT |
518 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
519 | return; | |
520 | } | |
521 | ||
522 | error = NULL; | |
91b165c0 | 523 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
524 | buf = default_buf; |
525 | ||
ae2587e4 | 526 | while (1) { |
1da177e4 | 527 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 528 | if (error != NULL) { |
1da177e4 LT |
529 | mconsole_reply(req, error, 1, 0); |
530 | goto out; | |
531 | } | |
532 | ||
ae2587e4 | 533 | if (n <= size) { |
1da177e4 LT |
534 | mconsole_reply(req, buf, 0, 0); |
535 | goto out; | |
536 | } | |
537 | ||
ae2587e4 | 538 | if (buf != default_buf) |
1da177e4 LT |
539 | kfree(buf); |
540 | ||
541 | size = n; | |
542 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 543 | if (buf == NULL) { |
1da177e4 LT |
544 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
545 | return; | |
546 | } | |
547 | } | |
548 | out: | |
ae2587e4 | 549 | if (buf != default_buf) |
1da177e4 | 550 | kfree(buf); |
1da177e4 LT |
551 | } |
552 | ||
553 | void mconsole_config(struct mc_request *req) | |
554 | { | |
555 | struct mc_device *dev; | |
f28169d2 | 556 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
557 | int err; |
558 | ||
559 | ptr += strlen("config"); | |
ae2587e4 JD |
560 | while (isspace(*ptr)) |
561 | ptr++; | |
1da177e4 | 562 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 563 | if (dev == NULL) { |
1da177e4 LT |
564 | mconsole_reply(req, "Bad configuration option", 1, 0); |
565 | return; | |
566 | } | |
567 | ||
568 | name = &ptr[strlen(dev->name)]; | |
569 | ptr = name; | |
ae2587e4 | 570 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
571 | ptr++; |
572 | ||
ae2587e4 | 573 | if (*ptr == '=') { |
f28169d2 JD |
574 | err = (*dev->config)(name, &error_string); |
575 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
576 | } |
577 | else mconsole_get_config(dev->get_config, req, name); | |
578 | } | |
579 | ||
580 | void mconsole_remove(struct mc_request *req) | |
581 | { | |
d50084a2 | 582 | struct mc_device *dev; |
29d56cfe | 583 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 584 | char error[256]; |
29d56cfe | 585 | int err, start, end, n; |
1da177e4 LT |
586 | |
587 | ptr += strlen("remove"); | |
ae2587e4 | 588 | while (isspace(*ptr)) ptr++; |
1da177e4 | 589 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 590 | if (dev == NULL) { |
1da177e4 LT |
591 | mconsole_reply(req, "Bad remove option", 1, 0); |
592 | return; | |
593 | } | |
29d56cfe | 594 | |
3a331a51 JD |
595 | ptr = &ptr[strlen(dev->name)]; |
596 | ||
597 | err = 1; | |
598 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 599 | if (n < 0) { |
3a331a51 JD |
600 | err_msg = "Couldn't parse device number"; |
601 | goto out; | |
602 | } | |
ae2587e4 | 603 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
604 | sprintf(error, "Invalid device number - must be between " |
605 | "%d and %d", start, end); | |
606 | err_msg = error; | |
607 | goto out; | |
608 | } | |
29d56cfe | 609 | |
f28169d2 JD |
610 | err_msg = NULL; |
611 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 612 | switch(err) { |
d40f6d71 JD |
613 | case 0: |
614 | err_msg = ""; | |
615 | break; | |
3a331a51 | 616 | case -ENODEV: |
ae2587e4 | 617 | if (err_msg == NULL) |
f28169d2 | 618 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
619 | break; |
620 | case -EBUSY: | |
ae2587e4 | 621 | if (err_msg == NULL) |
f28169d2 | 622 | err_msg = "Device is currently open"; |
3a331a51 JD |
623 | break; |
624 | default: | |
625 | break; | |
626 | } | |
627 | out: | |
29d56cfe | 628 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
629 | } |
630 | ||
f92afe56 JD |
631 | struct mconsole_output { |
632 | struct list_head list; | |
633 | struct mc_request *req; | |
634 | }; | |
635 | ||
84f48d4f | 636 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
637 | static LIST_HEAD(clients); |
638 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
639 | |
640 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 641 | unsigned int len) |
6f517d3f JD |
642 | { |
643 | struct list_head *ele; | |
644 | int n; | |
645 | ||
ae2587e4 | 646 | if (list_empty(&clients)) |
6f517d3f JD |
647 | return; |
648 | ||
54fa0ba4 JD |
649 | while (len > 0) { |
650 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
651 | strncpy(console_buf, string, n); | |
6f517d3f JD |
652 | string += n; |
653 | len -= n; | |
6f517d3f | 654 | |
ae2587e4 | 655 | list_for_each(ele, &clients) { |
f92afe56 | 656 | struct mconsole_output *entry; |
6f517d3f | 657 | |
f92afe56 | 658 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 659 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 660 | } |
6f517d3f JD |
661 | } |
662 | } | |
663 | ||
664 | static struct console mc_console = { .name = "mc", | |
665 | .write = console_write, | |
a174b30e | 666 | .flags = CON_ENABLED, |
6f517d3f JD |
667 | .index = -1 }; |
668 | ||
669 | static int mc_add_console(void) | |
670 | { | |
671 | register_console(&mc_console); | |
672 | return 0; | |
673 | } | |
674 | ||
675 | late_initcall(mc_add_console); | |
676 | ||
677 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
678 | void *arg) | |
679 | { | |
f92afe56 | 680 | struct mconsole_output entry; |
6f517d3f JD |
681 | unsigned long flags; |
682 | ||
f92afe56 | 683 | entry.req = req; |
84f48d4f | 684 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 685 | list_add(&entry.list, &clients); |
84f48d4f | 686 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
687 | |
688 | (*proc)(arg); | |
689 | ||
54fa0ba4 | 690 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 691 | |
84f48d4f | 692 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 693 | list_del(&entry.list); |
84f48d4f | 694 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
695 | } |
696 | ||
4111b025 | 697 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
698 | |
699 | #include <linux/sysrq.h> | |
700 | ||
4111b025 JD |
701 | static void sysrq_proc(void *arg) |
702 | { | |
703 | char *op = arg; | |
7bea96fd | 704 | handle_sysrq(*op, NULL); |
4111b025 JD |
705 | } |
706 | ||
707 | void mconsole_sysrq(struct mc_request *req) | |
708 | { | |
709 | char *ptr = req->request.data; | |
710 | ||
711 | ptr += strlen("sysrq"); | |
ae2587e4 | 712 | while (isspace(*ptr)) ptr++; |
4111b025 | 713 | |
ae2587e4 JD |
714 | /* |
715 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
716 | * so in this case, we reply first. |
717 | */ | |
ae2587e4 | 718 | if (*ptr == 'b') |
4111b025 JD |
719 | mconsole_reply(req, "", 0, 0); |
720 | ||
721 | with_console(req, sysrq_proc, ptr); | |
722 | } | |
723 | #else | |
724 | void mconsole_sysrq(struct mc_request *req) | |
725 | { | |
726 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
727 | } | |
728 | #endif | |
729 | ||
6f517d3f JD |
730 | static void stack_proc(void *arg) |
731 | { | |
732 | struct task_struct *from = current, *to = arg; | |
733 | ||
734 | to->thread.saved_task = from; | |
735 | switch_to(from, to, from); | |
736 | } | |
737 | ||
ae2587e4 JD |
738 | /* |
739 | * Mconsole stack trace | |
3eddddcf JD |
740 | * Added by Allan Graves, Jeff Dike |
741 | * Dumps a stacks registers to the linux console. | |
742 | * Usage stack <pid>. | |
743 | */ | |
42fda663 | 744 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 745 | { |
3a331a51 JD |
746 | char *ptr = req->request.data; |
747 | int pid_requested= -1; | |
3eddddcf JD |
748 | struct task_struct *to = NULL; |
749 | ||
ae2587e4 JD |
750 | /* |
751 | * Would be nice: | |
3a331a51 | 752 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
753 | * 2) Add a way to stack dump all pids. |
754 | */ | |
755 | ||
3a331a51 | 756 | ptr += strlen("stack"); |
ae2587e4 JD |
757 | while (isspace(*ptr)) |
758 | ptr++; | |
3eddddcf | 759 | |
ae2587e4 JD |
760 | /* |
761 | * Should really check for multiple pids or reject bad args here | |
762 | */ | |
3a331a51 | 763 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 764 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
765 | mconsole_reply(req, "Please specify a pid", 1, 0); |
766 | return; | |
767 | } | |
3eddddcf | 768 | |
827b3f6a | 769 | to = find_task_by_pid_ns(pid_requested, &init_pid_ns); |
ae2587e4 | 770 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
771 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
772 | return; | |
773 | } | |
6f517d3f | 774 | with_console(req, stack_proc, to); |
3eddddcf | 775 | } |
3eddddcf | 776 | |
ae2587e4 JD |
777 | /* |
778 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
779 | * active. |
780 | */ | |
d50084a2 | 781 | static char *notify_socket = NULL; |
1da177e4 | 782 | |
97a1fcbb | 783 | static int __init mconsole_init(void) |
1da177e4 LT |
784 | { |
785 | /* long to avoid size mismatch warnings from gcc */ | |
786 | long sock; | |
787 | int err; | |
788 | char file[256]; | |
789 | ||
ae2587e4 JD |
790 | if (umid_file_name("mconsole", file, sizeof(file))) |
791 | return -1; | |
1da177e4 LT |
792 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
793 | ||
794 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
795 | if (sock < 0) { |
796 | printk(KERN_ERR "Failed to initialize management console\n"); | |
797 | return 1; | |
1da177e4 | 798 | } |
438ee679 JD |
799 | if (os_set_fd_block(sock, 0)) |
800 | goto out; | |
1da177e4 LT |
801 | |
802 | register_reboot_notifier(&reboot_notifier); | |
803 | ||
804 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 805 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 806 | "mconsole", (void *)sock); |
ae2587e4 JD |
807 | if (err) { |
808 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 809 | goto out; |
1da177e4 LT |
810 | } |
811 | ||
ae2587e4 | 812 | if (notify_socket != NULL) { |
970d6e3a | 813 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 814 | if (notify_socket != NULL) |
1da177e4 | 815 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 816 | mconsole_socket_name, |
1da177e4 LT |
817 | strlen(mconsole_socket_name) + 1); |
818 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
819 | "string\n"); | |
820 | } | |
821 | ||
ae2587e4 | 822 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 823 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 824 | return 0; |
438ee679 JD |
825 | |
826 | out: | |
827 | os_close_file(sock); | |
828 | return 1; | |
1da177e4 LT |
829 | } |
830 | ||
831 | __initcall(mconsole_init); | |
832 | ||
833 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
834 | unsigned long count, void *data) | |
835 | { | |
836 | char *buf; | |
837 | ||
838 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
839 | if (buf == NULL) |
840 | return -ENOMEM; | |
1da177e4 | 841 | |
ae2587e4 | 842 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
843 | count = -EFAULT; |
844 | goto out; | |
845 | } | |
846 | ||
847 | buf[count] = '\0'; | |
848 | ||
849 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
850 | out: | |
851 | kfree(buf); | |
ae2587e4 | 852 | return count; |
1da177e4 LT |
853 | } |
854 | ||
855 | static int create_proc_mconsole(void) | |
856 | { | |
857 | struct proc_dir_entry *ent; | |
858 | ||
ae2587e4 JD |
859 | if (notify_socket == NULL) |
860 | return 0; | |
1da177e4 LT |
861 | |
862 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
ae2587e4 JD |
863 | if (ent == NULL) { |
864 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
865 | "failed\n"); | |
866 | return 0; | |
1da177e4 LT |
867 | } |
868 | ||
869 | ent->read_proc = NULL; | |
870 | ent->write_proc = write_proc_mconsole; | |
ae2587e4 | 871 | return 0; |
1da177e4 LT |
872 | } |
873 | ||
874 | static DEFINE_SPINLOCK(notify_spinlock); | |
875 | ||
876 | void lock_notify(void) | |
877 | { | |
878 | spin_lock(¬ify_spinlock); | |
879 | } | |
880 | ||
881 | void unlock_notify(void) | |
882 | { | |
883 | spin_unlock(¬ify_spinlock); | |
884 | } | |
885 | ||
886 | __initcall(create_proc_mconsole); | |
887 | ||
088bec41 | 888 | #define NOTIFY "notify:" |
1da177e4 LT |
889 | |
890 | static int mconsole_setup(char *str) | |
891 | { | |
ae2587e4 | 892 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
893 | str += strlen(NOTIFY); |
894 | notify_socket = str; | |
895 | } | |
896 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 897 | return 1; |
1da177e4 LT |
898 | } |
899 | ||
088bec41 | 900 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
901 | |
902 | __uml_help(mconsole_setup, | |
903 | "mconsole=notify:<socket>\n" | |
904 | " Requests that the mconsole driver send a message to the named Unix\n" | |
905 | " socket containing the name of the mconsole socket. This also serves\n" | |
906 | " to notify outside processes when UML has booted far enough to respond\n" | |
907 | " to mconsole requests.\n\n" | |
908 | ); | |
909 | ||
910 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
911 | void *ptr) | |
912 | { | |
913 | char *message = ptr; | |
914 | ||
ae2587e4 JD |
915 | if (notify_socket == NULL) |
916 | return 0; | |
1da177e4 | 917 | |
d50084a2 | 918 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 919 | strlen(message) + 1); |
ae2587e4 | 920 | return 0; |
1da177e4 LT |
921 | } |
922 | ||
923 | static struct notifier_block panic_exit_notifier = { | |
924 | .notifier_call = notify_panic, | |
925 | .next = NULL, | |
926 | .priority = 1 | |
927 | }; | |
928 | ||
929 | static int add_notifier(void) | |
930 | { | |
e041c683 AS |
931 | atomic_notifier_chain_register(&panic_notifier_list, |
932 | &panic_exit_notifier); | |
ae2587e4 | 933 | return 0; |
1da177e4 LT |
934 | } |
935 | ||
936 | __initcall(add_notifier); | |
937 | ||
938 | char *mconsole_notify_socket(void) | |
939 | { | |
ae2587e4 | 940 | return notify_socket; |
1da177e4 LT |
941 | } |
942 | ||
943 | EXPORT_SYMBOL(mconsole_notify_socket); |