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Commit | Line | Data |
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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 | 307 | mconsole_reply(req, "stopped", 0, 0); |
cc0be0fb KS |
308 | for (;;) { |
309 | if (!mconsole_get_request(req->originating_fd, req)) | |
310 | continue; | |
3a51237d AV |
311 | if (req->cmd->handler == mconsole_go) |
312 | break; | |
313 | if (req->cmd->handler == mconsole_stop) { | |
314 | mconsole_reply(req, "Already stopped", 1, 0); | |
315 | continue; | |
316 | } | |
317 | if (req->cmd->handler == mconsole_sysrq) { | |
318 | struct pt_regs *old_regs; | |
319 | old_regs = set_irq_regs((struct pt_regs *)&req->regs); | |
320 | mconsole_sysrq(req); | |
321 | set_irq_regs(old_regs); | |
322 | continue; | |
323 | } | |
1da177e4 LT |
324 | (*req->cmd->handler)(req); |
325 | } | |
326 | os_set_fd_block(req->originating_fd, 0); | |
327 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); | |
328 | mconsole_reply(req, "", 0, 0); | |
329 | } | |
330 | ||
84f48d4f | 331 | static DEFINE_SPINLOCK(mc_devices_lock); |
42947cb9 | 332 | static LIST_HEAD(mconsole_devices); |
1da177e4 LT |
333 | |
334 | void mconsole_register_dev(struct mc_device *new) | |
335 | { | |
84f48d4f JD |
336 | spin_lock(&mc_devices_lock); |
337 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 338 | list_add(&new->list, &mconsole_devices); |
84f48d4f | 339 | spin_unlock(&mc_devices_lock); |
1da177e4 LT |
340 | } |
341 | ||
342 | static struct mc_device *mconsole_find_dev(char *name) | |
343 | { | |
344 | struct list_head *ele; | |
345 | struct mc_device *dev; | |
346 | ||
ae2587e4 | 347 | list_for_each(ele, &mconsole_devices) { |
1da177e4 | 348 | dev = list_entry(ele, struct mc_device, list); |
ae2587e4 JD |
349 | if (!strncmp(name, dev->name, strlen(dev->name))) |
350 | return dev; | |
1da177e4 | 351 | } |
ae2587e4 | 352 | return NULL; |
1da177e4 LT |
353 | } |
354 | ||
02dea087 JD |
355 | #define UNPLUGGED_PER_PAGE \ |
356 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) | |
357 | ||
358 | struct unplugged_pages { | |
359 | struct list_head list; | |
360 | void *pages[UNPLUGGED_PER_PAGE]; | |
361 | }; | |
362 | ||
84f48d4f | 363 | static DECLARE_MUTEX(plug_mem_mutex); |
02dea087 | 364 | static unsigned long long unplugged_pages_count = 0; |
c59bce62 | 365 | static LIST_HEAD(unplugged_pages); |
02dea087 JD |
366 | static int unplug_index = UNPLUGGED_PER_PAGE; |
367 | ||
f28169d2 | 368 | static int mem_config(char *str, char **error_out) |
02dea087 JD |
369 | { |
370 | unsigned long long diff; | |
371 | int err = -EINVAL, i, add; | |
372 | char *ret; | |
373 | ||
ae2587e4 | 374 | if (str[0] != '=') { |
f28169d2 | 375 | *error_out = "Expected '=' after 'mem'"; |
02dea087 | 376 | goto out; |
f28169d2 | 377 | } |
02dea087 JD |
378 | |
379 | str++; | |
ae2587e4 | 380 | if (str[0] == '-') |
02dea087 | 381 | add = 0; |
ae2587e4 | 382 | else if (str[0] == '+') { |
02dea087 JD |
383 | add = 1; |
384 | } | |
f28169d2 JD |
385 | else { |
386 | *error_out = "Expected increment to start with '-' or '+'"; | |
387 | goto out; | |
388 | } | |
02dea087 JD |
389 | |
390 | str++; | |
391 | diff = memparse(str, &ret); | |
ae2587e4 | 392 | if (*ret != '\0') { |
f28169d2 | 393 | *error_out = "Failed to parse memory increment"; |
02dea087 | 394 | goto out; |
f28169d2 | 395 | } |
02dea087 JD |
396 | |
397 | diff /= PAGE_SIZE; | |
398 | ||
84f48d4f | 399 | down(&plug_mem_mutex); |
ae2587e4 | 400 | for (i = 0; i < diff; i++) { |
02dea087 JD |
401 | struct unplugged_pages *unplugged; |
402 | void *addr; | |
403 | ||
ae2587e4 JD |
404 | if (add) { |
405 | if (list_empty(&unplugged_pages)) | |
02dea087 JD |
406 | break; |
407 | ||
408 | unplugged = list_entry(unplugged_pages.next, | |
409 | struct unplugged_pages, list); | |
ae2587e4 | 410 | if (unplug_index > 0) |
02dea087 JD |
411 | addr = unplugged->pages[--unplug_index]; |
412 | else { | |
413 | list_del(&unplugged->list); | |
414 | addr = unplugged; | |
415 | unplug_index = UNPLUGGED_PER_PAGE; | |
416 | } | |
417 | ||
418 | free_page((unsigned long) addr); | |
419 | unplugged_pages_count--; | |
420 | } | |
421 | else { | |
422 | struct page *page; | |
423 | ||
424 | page = alloc_page(GFP_ATOMIC); | |
ae2587e4 | 425 | if (page == NULL) |
02dea087 JD |
426 | break; |
427 | ||
428 | unplugged = page_address(page); | |
ae2587e4 | 429 | if (unplug_index == UNPLUGGED_PER_PAGE) { |
02dea087 JD |
430 | list_add(&unplugged->list, &unplugged_pages); |
431 | unplug_index = 0; | |
432 | } | |
433 | else { | |
434 | struct list_head *entry = unplugged_pages.next; | |
435 | addr = unplugged; | |
436 | ||
437 | unplugged = list_entry(entry, | |
438 | struct unplugged_pages, | |
439 | list); | |
02dea087 | 440 | err = os_drop_memory(addr, PAGE_SIZE); |
ae2587e4 JD |
441 | if (err) { |
442 | printk(KERN_ERR "Failed to release " | |
443 | "memory - errno = %d\n", err); | |
f28169d2 | 444 | *error_out = "Failed to release memory"; |
84f48d4f | 445 | goto out_unlock; |
f28169d2 JD |
446 | } |
447 | unplugged->pages[unplug_index++] = addr; | |
02dea087 JD |
448 | } |
449 | ||
450 | unplugged_pages_count++; | |
451 | } | |
452 | } | |
453 | ||
454 | err = 0; | |
84f48d4f JD |
455 | out_unlock: |
456 | up(&plug_mem_mutex); | |
02dea087 JD |
457 | out: |
458 | return err; | |
459 | } | |
460 | ||
461 | static int mem_get_config(char *name, char *str, int size, char **error_out) | |
462 | { | |
463 | char buf[sizeof("18446744073709551615")]; | |
464 | int len = 0; | |
465 | ||
466 | sprintf(buf, "%ld", uml_physmem); | |
467 | CONFIG_CHUNK(str, size, len, buf, 1); | |
468 | ||
469 | return len; | |
470 | } | |
471 | ||
472 | static int mem_id(char **str, int *start_out, int *end_out) | |
473 | { | |
474 | *start_out = 0; | |
475 | *end_out = 0; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
f28169d2 | 480 | static int mem_remove(int n, char **error_out) |
02dea087 | 481 | { |
f28169d2 | 482 | *error_out = "Memory doesn't support the remove operation"; |
02dea087 JD |
483 | return -EBUSY; |
484 | } | |
485 | ||
486 | static struct mc_device mem_mc = { | |
84f48d4f | 487 | .list = LIST_HEAD_INIT(mem_mc.list), |
02dea087 JD |
488 | .name = "mem", |
489 | .config = mem_config, | |
490 | .get_config = mem_get_config, | |
491 | .id = mem_id, | |
492 | .remove = mem_remove, | |
493 | }; | |
494 | ||
97a1fcbb | 495 | static int __init mem_mc_init(void) |
02dea087 | 496 | { |
ae2587e4 | 497 | if (can_drop_memory()) |
02dea087 | 498 | mconsole_register_dev(&mem_mc); |
ae2587e4 JD |
499 | else printk(KERN_ERR "Can't release memory to the host - memory " |
500 | "hotplug won't be supported\n"); | |
02dea087 JD |
501 | return 0; |
502 | } | |
503 | ||
504 | __initcall(mem_mc_init); | |
505 | ||
1da177e4 LT |
506 | #define CONFIG_BUF_SIZE 64 |
507 | ||
d50084a2 | 508 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
1da177e4 LT |
509 | char **), |
510 | struct mc_request *req, char *name) | |
511 | { | |
512 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; | |
513 | int n, size; | |
514 | ||
ae2587e4 | 515 | if (get_config == NULL) { |
1da177e4 LT |
516 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
517 | return; | |
518 | } | |
519 | ||
520 | error = NULL; | |
91b165c0 | 521 | size = ARRAY_SIZE(default_buf); |
1da177e4 LT |
522 | buf = default_buf; |
523 | ||
ae2587e4 | 524 | while (1) { |
1da177e4 | 525 | n = (*get_config)(name, buf, size, &error); |
ae2587e4 | 526 | if (error != NULL) { |
1da177e4 LT |
527 | mconsole_reply(req, error, 1, 0); |
528 | goto out; | |
529 | } | |
530 | ||
ae2587e4 | 531 | if (n <= size) { |
1da177e4 LT |
532 | mconsole_reply(req, buf, 0, 0); |
533 | goto out; | |
534 | } | |
535 | ||
ae2587e4 | 536 | if (buf != default_buf) |
1da177e4 LT |
537 | kfree(buf); |
538 | ||
539 | size = n; | |
540 | buf = kmalloc(size, GFP_KERNEL); | |
ae2587e4 | 541 | if (buf == NULL) { |
1da177e4 LT |
542 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
543 | return; | |
544 | } | |
545 | } | |
546 | out: | |
ae2587e4 | 547 | if (buf != default_buf) |
1da177e4 | 548 | kfree(buf); |
1da177e4 LT |
549 | } |
550 | ||
551 | void mconsole_config(struct mc_request *req) | |
552 | { | |
553 | struct mc_device *dev; | |
f28169d2 | 554 | char *ptr = req->request.data, *name, *error_string = ""; |
1da177e4 LT |
555 | int err; |
556 | ||
557 | ptr += strlen("config"); | |
ae2587e4 JD |
558 | while (isspace(*ptr)) |
559 | ptr++; | |
1da177e4 | 560 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 561 | if (dev == NULL) { |
1da177e4 LT |
562 | mconsole_reply(req, "Bad configuration option", 1, 0); |
563 | return; | |
564 | } | |
565 | ||
566 | name = &ptr[strlen(dev->name)]; | |
567 | ptr = name; | |
ae2587e4 | 568 | while ((*ptr != '=') && (*ptr != '\0')) |
1da177e4 LT |
569 | ptr++; |
570 | ||
ae2587e4 | 571 | if (*ptr == '=') { |
f28169d2 JD |
572 | err = (*dev->config)(name, &error_string); |
573 | mconsole_reply(req, error_string, err, 0); | |
1da177e4 LT |
574 | } |
575 | else mconsole_get_config(dev->get_config, req, name); | |
576 | } | |
577 | ||
578 | void mconsole_remove(struct mc_request *req) | |
579 | { | |
d50084a2 | 580 | struct mc_device *dev; |
29d56cfe | 581 | char *ptr = req->request.data, *err_msg = ""; |
3a331a51 | 582 | char error[256]; |
29d56cfe | 583 | int err, start, end, n; |
1da177e4 LT |
584 | |
585 | ptr += strlen("remove"); | |
ae2587e4 | 586 | while (isspace(*ptr)) ptr++; |
1da177e4 | 587 | dev = mconsole_find_dev(ptr); |
ae2587e4 | 588 | if (dev == NULL) { |
1da177e4 LT |
589 | mconsole_reply(req, "Bad remove option", 1, 0); |
590 | return; | |
591 | } | |
29d56cfe | 592 | |
3a331a51 JD |
593 | ptr = &ptr[strlen(dev->name)]; |
594 | ||
595 | err = 1; | |
596 | n = (*dev->id)(&ptr, &start, &end); | |
ae2587e4 | 597 | if (n < 0) { |
3a331a51 JD |
598 | err_msg = "Couldn't parse device number"; |
599 | goto out; | |
600 | } | |
ae2587e4 | 601 | else if ((n < start) || (n > end)) { |
3a331a51 JD |
602 | sprintf(error, "Invalid device number - must be between " |
603 | "%d and %d", start, end); | |
604 | err_msg = error; | |
605 | goto out; | |
606 | } | |
29d56cfe | 607 | |
f28169d2 JD |
608 | err_msg = NULL; |
609 | err = (*dev->remove)(n, &err_msg); | |
ae2587e4 | 610 | switch(err) { |
d40f6d71 JD |
611 | case 0: |
612 | err_msg = ""; | |
613 | break; | |
3a331a51 | 614 | case -ENODEV: |
ae2587e4 | 615 | if (err_msg == NULL) |
f28169d2 | 616 | err_msg = "Device doesn't exist"; |
3a331a51 JD |
617 | break; |
618 | case -EBUSY: | |
ae2587e4 | 619 | if (err_msg == NULL) |
f28169d2 | 620 | err_msg = "Device is currently open"; |
3a331a51 JD |
621 | break; |
622 | default: | |
623 | break; | |
624 | } | |
625 | out: | |
29d56cfe | 626 | mconsole_reply(req, err_msg, err, 0); |
1da177e4 LT |
627 | } |
628 | ||
f92afe56 JD |
629 | struct mconsole_output { |
630 | struct list_head list; | |
631 | struct mc_request *req; | |
632 | }; | |
633 | ||
84f48d4f | 634 | static DEFINE_SPINLOCK(client_lock); |
6f517d3f JD |
635 | static LIST_HEAD(clients); |
636 | static char console_buf[MCONSOLE_MAX_DATA]; | |
6f517d3f JD |
637 | |
638 | static void console_write(struct console *console, const char *string, | |
54fa0ba4 | 639 | unsigned int len) |
6f517d3f JD |
640 | { |
641 | struct list_head *ele; | |
642 | int n; | |
643 | ||
ae2587e4 | 644 | if (list_empty(&clients)) |
6f517d3f JD |
645 | return; |
646 | ||
54fa0ba4 JD |
647 | while (len > 0) { |
648 | n = min((size_t) len, ARRAY_SIZE(console_buf)); | |
649 | strncpy(console_buf, string, n); | |
6f517d3f JD |
650 | string += n; |
651 | len -= n; | |
6f517d3f | 652 | |
ae2587e4 | 653 | list_for_each(ele, &clients) { |
f92afe56 | 654 | struct mconsole_output *entry; |
6f517d3f | 655 | |
f92afe56 | 656 | entry = list_entry(ele, struct mconsole_output, list); |
54fa0ba4 | 657 | mconsole_reply_len(entry->req, console_buf, n, 0, 1); |
6f517d3f | 658 | } |
6f517d3f JD |
659 | } |
660 | } | |
661 | ||
662 | static struct console mc_console = { .name = "mc", | |
663 | .write = console_write, | |
a174b30e | 664 | .flags = CON_ENABLED, |
6f517d3f JD |
665 | .index = -1 }; |
666 | ||
667 | static int mc_add_console(void) | |
668 | { | |
669 | register_console(&mc_console); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | late_initcall(mc_add_console); | |
674 | ||
675 | static void with_console(struct mc_request *req, void (*proc)(void *), | |
676 | void *arg) | |
677 | { | |
f92afe56 | 678 | struct mconsole_output entry; |
6f517d3f JD |
679 | unsigned long flags; |
680 | ||
f92afe56 | 681 | entry.req = req; |
84f48d4f | 682 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 683 | list_add(&entry.list, &clients); |
84f48d4f | 684 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
685 | |
686 | (*proc)(arg); | |
687 | ||
54fa0ba4 | 688 | mconsole_reply_len(req, "", 0, 0, 0); |
6f517d3f | 689 | |
84f48d4f | 690 | spin_lock_irqsave(&client_lock, flags); |
6f517d3f | 691 | list_del(&entry.list); |
84f48d4f | 692 | spin_unlock_irqrestore(&client_lock, flags); |
6f517d3f JD |
693 | } |
694 | ||
4111b025 | 695 | #ifdef CONFIG_MAGIC_SYSRQ |
54fa0ba4 JD |
696 | |
697 | #include <linux/sysrq.h> | |
698 | ||
4111b025 JD |
699 | static void sysrq_proc(void *arg) |
700 | { | |
701 | char *op = arg; | |
7bea96fd | 702 | handle_sysrq(*op, NULL); |
4111b025 JD |
703 | } |
704 | ||
705 | void mconsole_sysrq(struct mc_request *req) | |
706 | { | |
707 | char *ptr = req->request.data; | |
708 | ||
709 | ptr += strlen("sysrq"); | |
ae2587e4 | 710 | while (isspace(*ptr)) ptr++; |
4111b025 | 711 | |
ae2587e4 JD |
712 | /* |
713 | * With 'b', the system will shut down without a chance to reply, | |
4111b025 JD |
714 | * so in this case, we reply first. |
715 | */ | |
ae2587e4 | 716 | if (*ptr == 'b') |
4111b025 JD |
717 | mconsole_reply(req, "", 0, 0); |
718 | ||
719 | with_console(req, sysrq_proc, ptr); | |
720 | } | |
721 | #else | |
722 | void mconsole_sysrq(struct mc_request *req) | |
723 | { | |
724 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); | |
725 | } | |
726 | #endif | |
727 | ||
6f517d3f JD |
728 | static void stack_proc(void *arg) |
729 | { | |
730 | struct task_struct *from = current, *to = arg; | |
731 | ||
732 | to->thread.saved_task = from; | |
733 | switch_to(from, to, from); | |
734 | } | |
735 | ||
ae2587e4 JD |
736 | /* |
737 | * Mconsole stack trace | |
3eddddcf JD |
738 | * Added by Allan Graves, Jeff Dike |
739 | * Dumps a stacks registers to the linux console. | |
740 | * Usage stack <pid>. | |
741 | */ | |
42fda663 | 742 | void mconsole_stack(struct mc_request *req) |
3eddddcf | 743 | { |
3a331a51 JD |
744 | char *ptr = req->request.data; |
745 | int pid_requested= -1; | |
3eddddcf JD |
746 | struct task_struct *to = NULL; |
747 | ||
ae2587e4 JD |
748 | /* |
749 | * Would be nice: | |
3a331a51 | 750 | * 1) Send showregs output to mconsole. |
3eddddcf JD |
751 | * 2) Add a way to stack dump all pids. |
752 | */ | |
753 | ||
3a331a51 | 754 | ptr += strlen("stack"); |
ae2587e4 JD |
755 | while (isspace(*ptr)) |
756 | ptr++; | |
3eddddcf | 757 | |
ae2587e4 JD |
758 | /* |
759 | * Should really check for multiple pids or reject bad args here | |
760 | */ | |
3a331a51 | 761 | /* What do the arguments in mconsole_reply mean? */ |
ae2587e4 | 762 | if (sscanf(ptr, "%d", &pid_requested) == 0) { |
3a331a51 JD |
763 | mconsole_reply(req, "Please specify a pid", 1, 0); |
764 | return; | |
765 | } | |
3eddddcf | 766 | |
6f517d3f | 767 | to = find_task_by_pid(pid_requested); |
ae2587e4 | 768 | if ((to == NULL) || (pid_requested == 0)) { |
3a331a51 JD |
769 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
770 | return; | |
771 | } | |
6f517d3f | 772 | with_console(req, stack_proc, to); |
3eddddcf | 773 | } |
3eddddcf | 774 | |
ae2587e4 JD |
775 | /* |
776 | * Changed by mconsole_setup, which is __setup, and called before SMP is | |
1da177e4 LT |
777 | * active. |
778 | */ | |
d50084a2 | 779 | static char *notify_socket = NULL; |
1da177e4 | 780 | |
97a1fcbb | 781 | static int __init mconsole_init(void) |
1da177e4 LT |
782 | { |
783 | /* long to avoid size mismatch warnings from gcc */ | |
784 | long sock; | |
785 | int err; | |
786 | char file[256]; | |
787 | ||
ae2587e4 JD |
788 | if (umid_file_name("mconsole", file, sizeof(file))) |
789 | return -1; | |
1da177e4 LT |
790 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
791 | ||
792 | sock = os_create_unix_socket(file, sizeof(file), 1); | |
ae2587e4 JD |
793 | if (sock < 0) { |
794 | printk(KERN_ERR "Failed to initialize management console\n"); | |
795 | return 1; | |
1da177e4 | 796 | } |
438ee679 JD |
797 | if (os_set_fd_block(sock, 0)) |
798 | goto out; | |
1da177e4 LT |
799 | |
800 | register_reboot_notifier(&reboot_notifier); | |
801 | ||
802 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, | |
bd6aa650 | 803 | IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, |
1da177e4 | 804 | "mconsole", (void *)sock); |
ae2587e4 JD |
805 | if (err) { |
806 | printk(KERN_ERR "Failed to get IRQ for management console\n"); | |
438ee679 | 807 | goto out; |
1da177e4 LT |
808 | } |
809 | ||
ae2587e4 | 810 | if (notify_socket != NULL) { |
970d6e3a | 811 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
ae2587e4 | 812 | if (notify_socket != NULL) |
1da177e4 | 813 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
d50084a2 | 814 | mconsole_socket_name, |
1da177e4 LT |
815 | strlen(mconsole_socket_name) + 1); |
816 | else printk(KERN_ERR "mconsole_setup failed to strdup " | |
817 | "string\n"); | |
818 | } | |
819 | ||
ae2587e4 | 820 | printk(KERN_INFO "mconsole (version %d) initialized on %s\n", |
1da177e4 | 821 | MCONSOLE_VERSION, mconsole_socket_name); |
ae2587e4 | 822 | return 0; |
438ee679 JD |
823 | |
824 | out: | |
825 | os_close_file(sock); | |
826 | return 1; | |
1da177e4 LT |
827 | } |
828 | ||
829 | __initcall(mconsole_init); | |
830 | ||
831 | static int write_proc_mconsole(struct file *file, const char __user *buffer, | |
832 | unsigned long count, void *data) | |
833 | { | |
834 | char *buf; | |
835 | ||
836 | buf = kmalloc(count + 1, GFP_KERNEL); | |
ae2587e4 JD |
837 | if (buf == NULL) |
838 | return -ENOMEM; | |
1da177e4 | 839 | |
ae2587e4 | 840 | if (copy_from_user(buf, buffer, count)) { |
1da177e4 LT |
841 | count = -EFAULT; |
842 | goto out; | |
843 | } | |
844 | ||
845 | buf[count] = '\0'; | |
846 | ||
847 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); | |
848 | out: | |
849 | kfree(buf); | |
ae2587e4 | 850 | return count; |
1da177e4 LT |
851 | } |
852 | ||
853 | static int create_proc_mconsole(void) | |
854 | { | |
855 | struct proc_dir_entry *ent; | |
856 | ||
ae2587e4 JD |
857 | if (notify_socket == NULL) |
858 | return 0; | |
1da177e4 LT |
859 | |
860 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); | |
ae2587e4 JD |
861 | if (ent == NULL) { |
862 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry " | |
863 | "failed\n"); | |
864 | return 0; | |
1da177e4 LT |
865 | } |
866 | ||
867 | ent->read_proc = NULL; | |
868 | ent->write_proc = write_proc_mconsole; | |
ae2587e4 | 869 | return 0; |
1da177e4 LT |
870 | } |
871 | ||
872 | static DEFINE_SPINLOCK(notify_spinlock); | |
873 | ||
874 | void lock_notify(void) | |
875 | { | |
876 | spin_lock(¬ify_spinlock); | |
877 | } | |
878 | ||
879 | void unlock_notify(void) | |
880 | { | |
881 | spin_unlock(¬ify_spinlock); | |
882 | } | |
883 | ||
884 | __initcall(create_proc_mconsole); | |
885 | ||
088bec41 | 886 | #define NOTIFY "notify:" |
1da177e4 LT |
887 | |
888 | static int mconsole_setup(char *str) | |
889 | { | |
ae2587e4 | 890 | if (!strncmp(str, NOTIFY, strlen(NOTIFY))) { |
1da177e4 LT |
891 | str += strlen(NOTIFY); |
892 | notify_socket = str; | |
893 | } | |
894 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); | |
ae2587e4 | 895 | return 1; |
1da177e4 LT |
896 | } |
897 | ||
088bec41 | 898 | __setup("mconsole=", mconsole_setup); |
1da177e4 LT |
899 | |
900 | __uml_help(mconsole_setup, | |
901 | "mconsole=notify:<socket>\n" | |
902 | " Requests that the mconsole driver send a message to the named Unix\n" | |
903 | " socket containing the name of the mconsole socket. This also serves\n" | |
904 | " to notify outside processes when UML has booted far enough to respond\n" | |
905 | " to mconsole requests.\n\n" | |
906 | ); | |
907 | ||
908 | static int notify_panic(struct notifier_block *self, unsigned long unused1, | |
909 | void *ptr) | |
910 | { | |
911 | char *message = ptr; | |
912 | ||
ae2587e4 JD |
913 | if (notify_socket == NULL) |
914 | return 0; | |
1da177e4 | 915 | |
d50084a2 | 916 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
1da177e4 | 917 | strlen(message) + 1); |
ae2587e4 | 918 | return 0; |
1da177e4 LT |
919 | } |
920 | ||
921 | static struct notifier_block panic_exit_notifier = { | |
922 | .notifier_call = notify_panic, | |
923 | .next = NULL, | |
924 | .priority = 1 | |
925 | }; | |
926 | ||
927 | static int add_notifier(void) | |
928 | { | |
e041c683 AS |
929 | atomic_notifier_chain_register(&panic_notifier_list, |
930 | &panic_exit_notifier); | |
ae2587e4 | 931 | return 0; |
1da177e4 LT |
932 | } |
933 | ||
934 | __initcall(add_notifier); | |
935 | ||
936 | char *mconsole_notify_socket(void) | |
937 | { | |
ae2587e4 | 938 | return notify_socket; |
1da177e4 LT |
939 | } |
940 | ||
941 | EXPORT_SYMBOL(mconsole_notify_socket); |