Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) |
| 3 | * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com) |
| 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
| 7 | #include "linux/kernel.h" |
| 8 | #include "linux/slab.h" |
| 9 | #include "linux/init.h" |
| 10 | #include "linux/notifier.h" |
| 11 | #include "linux/reboot.h" |
| 12 | #include "linux/utsname.h" |
| 13 | #include "linux/ctype.h" |
| 14 | #include "linux/interrupt.h" |
| 15 | #include "linux/sysrq.h" |
| 16 | #include "linux/workqueue.h" |
| 17 | #include "linux/module.h" |
| 18 | #include "linux/file.h" |
| 19 | #include "linux/fs.h" |
| 20 | #include "linux/namei.h" |
| 21 | #include "linux/proc_fs.h" |
| 22 | #include "linux/syscalls.h" |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 23 | #include "linux/list.h" |
| 24 | #include "linux/mm.h" |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 25 | #include "linux/console.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "asm/irq.h" |
| 27 | #include "asm/uaccess.h" |
| 28 | #include "user_util.h" |
| 29 | #include "kern_util.h" |
| 30 | #include "kern.h" |
| 31 | #include "mconsole.h" |
| 32 | #include "mconsole_kern.h" |
| 33 | #include "irq_user.h" |
| 34 | #include "init.h" |
| 35 | #include "os.h" |
| 36 | #include "umid.h" |
| 37 | #include "irq_kern.h" |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 38 | #include "choose-mode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 40 | static int do_unlink_socket(struct notifier_block *notifier, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | unsigned long what, void *data) |
| 42 | { |
| 43 | return(mconsole_unlink_socket()); |
| 44 | } |
| 45 | |
| 46 | |
| 47 | static struct notifier_block reboot_notifier = { |
| 48 | .notifier_call = do_unlink_socket, |
| 49 | .priority = 0, |
| 50 | }; |
| 51 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 52 | /* Safe without explicit locking for now. Tasklets provide their own |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | * locking, and the interrupt handler is safe because it can't interrupt |
| 54 | * itself and it can only happen on CPU 0. |
| 55 | */ |
| 56 | |
Jeff Dike | 9010772 | 2006-01-06 00:18:54 -0800 | [diff] [blame] | 57 | static LIST_HEAD(mc_requests); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | static void mc_work_proc(void *unused) |
| 60 | { |
| 61 | struct mconsole_entry *req; |
| 62 | unsigned long flags; |
| 63 | |
| 64 | while(!list_empty(&mc_requests)){ |
Paolo 'Blaisorblade' Giarrusso | dbdb4c0 | 2006-04-10 22:53:39 -0700 | [diff] [blame] | 65 | local_irq_save(flags); |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 66 | req = list_entry(mc_requests.next, struct mconsole_entry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | list); |
| 68 | list_del(&req->list); |
| 69 | local_irq_restore(flags); |
| 70 | req->request.cmd->handler(&req->request); |
| 71 | kfree(req); |
| 72 | } |
| 73 | } |
| 74 | |
Jeff Dike | 9010772 | 2006-01-06 00:18:54 -0800 | [diff] [blame] | 75 | static DECLARE_WORK(mconsole_work, mc_work_proc, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | static irqreturn_t mconsole_interrupt(int irq, void *dev_id, |
| 78 | struct pt_regs *regs) |
| 79 | { |
| 80 | /* long to avoid size mismatch warnings from gcc */ |
| 81 | long fd; |
| 82 | struct mconsole_entry *new; |
| 83 | struct mc_request req; |
| 84 | |
| 85 | fd = (long) dev_id; |
| 86 | while (mconsole_get_request(fd, &req)){ |
| 87 | if(req.cmd->context == MCONSOLE_INTR) |
| 88 | (*req.cmd->handler)(&req); |
| 89 | else { |
Jeff Dike | 60baa15 | 2006-04-10 22:53:28 -0700 | [diff] [blame] | 90 | new = kmalloc(sizeof(*new), GFP_NOWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | if(new == NULL) |
| 92 | mconsole_reply(&req, "Out of memory", 1, 0); |
| 93 | else { |
| 94 | new->request = req; |
| 95 | list_add(&new->list, &mc_requests); |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | if(!list_empty(&mc_requests)) |
| 100 | schedule_work(&mconsole_work); |
| 101 | reactivate_fd(fd, MCONSOLE_IRQ); |
| 102 | return(IRQ_HANDLED); |
| 103 | } |
| 104 | |
| 105 | void mconsole_version(struct mc_request *req) |
| 106 | { |
| 107 | char version[256]; |
| 108 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 109 | sprintf(version, "%s %s %s %s %s", system_utsname.sysname, |
| 110 | system_utsname.nodename, system_utsname.release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | system_utsname.version, system_utsname.machine); |
| 112 | mconsole_reply(req, version, 0, 0); |
| 113 | } |
| 114 | |
| 115 | void mconsole_log(struct mc_request *req) |
| 116 | { |
| 117 | int len; |
| 118 | char *ptr = req->request.data; |
| 119 | |
| 120 | ptr += strlen("log "); |
| 121 | |
| 122 | len = req->len - (ptr - req->request.data); |
| 123 | printk("%.*s", len, ptr); |
| 124 | mconsole_reply(req, "", 0, 0); |
| 125 | } |
| 126 | |
| 127 | /* This is a more convoluted version of mconsole_proc, which has some stability |
| 128 | * problems; however, we need it fixed, because it is expected that UML users |
| 129 | * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still |
| 130 | * show the real procfs content, not the ones from hppfs.*/ |
| 131 | #if 0 |
| 132 | void mconsole_proc(struct mc_request *req) |
| 133 | { |
| 134 | struct nameidata nd; |
| 135 | struct file_system_type *proc; |
| 136 | struct super_block *super; |
| 137 | struct file *file; |
| 138 | int n, err; |
| 139 | char *ptr = req->request.data, *buf; |
| 140 | |
| 141 | ptr += strlen("proc"); |
| 142 | while(isspace(*ptr)) ptr++; |
| 143 | |
| 144 | proc = get_fs_type("proc"); |
| 145 | if(proc == NULL){ |
| 146 | mconsole_reply(req, "procfs not registered", 1, 0); |
| 147 | goto out; |
| 148 | } |
| 149 | |
| 150 | super = (*proc->get_sb)(proc, 0, NULL, NULL); |
| 151 | put_filesystem(proc); |
| 152 | if(super == NULL){ |
| 153 | mconsole_reply(req, "Failed to get procfs superblock", 1, 0); |
| 154 | goto out; |
| 155 | } |
| 156 | up_write(&super->s_umount); |
| 157 | |
| 158 | nd.dentry = super->s_root; |
| 159 | nd.mnt = NULL; |
| 160 | nd.flags = O_RDONLY + 1; |
| 161 | nd.last_type = LAST_ROOT; |
| 162 | |
| 163 | /* START: it was experienced that the stability problems are closed |
| 164 | * if commenting out these two calls + the below read cycle. To |
| 165 | * make UML crash again, it was enough to readd either one.*/ |
| 166 | err = link_path_walk(ptr, &nd); |
| 167 | if(err){ |
| 168 | mconsole_reply(req, "Failed to look up file", 1, 0); |
| 169 | goto out_kill; |
| 170 | } |
| 171 | |
| 172 | file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); |
| 173 | if(IS_ERR(file)){ |
| 174 | mconsole_reply(req, "Failed to open file", 1, 0); |
| 175 | goto out_kill; |
| 176 | } |
| 177 | /*END*/ |
| 178 | |
| 179 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 180 | if(buf == NULL){ |
| 181 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 182 | goto out_fput; |
| 183 | } |
| 184 | |
| 185 | if((file->f_op != NULL) && (file->f_op->read != NULL)){ |
| 186 | do { |
| 187 | n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, |
| 188 | &file->f_pos); |
| 189 | if(n >= 0){ |
| 190 | buf[n] = '\0'; |
| 191 | mconsole_reply(req, buf, 0, (n > 0)); |
| 192 | } |
| 193 | else { |
| 194 | mconsole_reply(req, "Read of file failed", |
| 195 | 1, 0); |
| 196 | goto out_free; |
| 197 | } |
| 198 | } while(n > 0); |
| 199 | } |
| 200 | else mconsole_reply(req, "", 0, 0); |
| 201 | |
| 202 | out_free: |
| 203 | kfree(buf); |
| 204 | out_fput: |
| 205 | fput(file); |
| 206 | out_kill: |
| 207 | deactivate_super(super); |
| 208 | out: ; |
| 209 | } |
| 210 | #endif |
| 211 | |
| 212 | void mconsole_proc(struct mc_request *req) |
| 213 | { |
| 214 | char path[64]; |
| 215 | char *buf; |
| 216 | int len; |
| 217 | int fd; |
| 218 | int first_chunk = 1; |
| 219 | char *ptr = req->request.data; |
| 220 | |
| 221 | ptr += strlen("proc"); |
| 222 | while(isspace(*ptr)) ptr++; |
| 223 | snprintf(path, sizeof(path), "/proc/%s", ptr); |
| 224 | |
| 225 | fd = sys_open(path, 0, 0); |
| 226 | if (fd < 0) { |
| 227 | mconsole_reply(req, "Failed to open file", 1, 0); |
| 228 | printk("open %s: %d\n",path,fd); |
| 229 | goto out; |
| 230 | } |
| 231 | |
| 232 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 233 | if(buf == NULL){ |
| 234 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 235 | goto out_close; |
| 236 | } |
| 237 | |
| 238 | for (;;) { |
| 239 | len = sys_read(fd, buf, PAGE_SIZE-1); |
| 240 | if (len < 0) { |
| 241 | mconsole_reply(req, "Read of file failed", 1, 0); |
| 242 | goto out_free; |
| 243 | } |
| 244 | /*Begin the file content on his own line.*/ |
| 245 | if (first_chunk) { |
| 246 | mconsole_reply(req, "\n", 0, 1); |
| 247 | first_chunk = 0; |
| 248 | } |
| 249 | if (len == PAGE_SIZE-1) { |
| 250 | buf[len] = '\0'; |
| 251 | mconsole_reply(req, buf, 0, 1); |
| 252 | } else { |
| 253 | buf[len] = '\0'; |
| 254 | mconsole_reply(req, buf, 0, 0); |
| 255 | break; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | out_free: |
| 260 | kfree(buf); |
| 261 | out_close: |
| 262 | sys_close(fd); |
| 263 | out: |
| 264 | /* nothing */; |
| 265 | } |
| 266 | |
| 267 | #define UML_MCONSOLE_HELPTEXT \ |
| 268 | "Commands: \n\ |
| 269 | version - Get kernel version \n\ |
| 270 | help - Print this message \n\ |
| 271 | halt - Halt UML \n\ |
| 272 | reboot - Reboot UML \n\ |
| 273 | config <dev>=<config> - Add a new device to UML; \n\ |
| 274 | same syntax as command line \n\ |
| 275 | config <dev> - Query the configuration of a device \n\ |
| 276 | remove <dev> - Remove a device from UML \n\ |
| 277 | sysrq <letter> - Performs the SysRq action controlled by the letter \n\ |
Jeff Dike | db80581 | 2006-02-01 03:06:23 -0800 | [diff] [blame] | 278 | cad - invoke the Ctrl-Alt-Del handler \n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | stop - pause the UML; it will do nothing until it receives a 'go' \n\ |
| 280 | go - continue the UML after a 'stop' \n\ |
| 281 | log <string> - make UML enter <string> into the kernel log\n\ |
| 282 | proc <file> - returns the contents of the UML's /proc/<file>\n\ |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 283 | stack <pid> - returns the stack of the specified pid\n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | " |
| 285 | |
| 286 | void mconsole_help(struct mc_request *req) |
| 287 | { |
| 288 | mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); |
| 289 | } |
| 290 | |
| 291 | void mconsole_halt(struct mc_request *req) |
| 292 | { |
| 293 | mconsole_reply(req, "", 0, 0); |
| 294 | machine_halt(); |
| 295 | } |
| 296 | |
| 297 | void mconsole_reboot(struct mc_request *req) |
| 298 | { |
| 299 | mconsole_reply(req, "", 0, 0); |
| 300 | machine_restart(NULL); |
| 301 | } |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | void mconsole_cad(struct mc_request *req) |
| 304 | { |
| 305 | mconsole_reply(req, "", 0, 0); |
| 306 | ctrl_alt_del(); |
| 307 | } |
| 308 | |
| 309 | void mconsole_go(struct mc_request *req) |
| 310 | { |
| 311 | mconsole_reply(req, "Not stopped", 1, 0); |
| 312 | } |
| 313 | |
| 314 | void mconsole_stop(struct mc_request *req) |
| 315 | { |
| 316 | deactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 317 | os_set_fd_block(req->originating_fd, 1); |
| 318 | mconsole_reply(req, "", 0, 0); |
| 319 | while(mconsole_get_request(req->originating_fd, req)){ |
| 320 | if(req->cmd->handler == mconsole_go) break; |
| 321 | (*req->cmd->handler)(req); |
| 322 | } |
| 323 | os_set_fd_block(req->originating_fd, 0); |
| 324 | reactivate_fd(req->originating_fd, MCONSOLE_IRQ); |
| 325 | mconsole_reply(req, "", 0, 0); |
| 326 | } |
| 327 | |
| 328 | /* This list is populated by __initcall routines. */ |
| 329 | |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 330 | static LIST_HEAD(mconsole_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | void mconsole_register_dev(struct mc_device *new) |
| 333 | { |
| 334 | list_add(&new->list, &mconsole_devices); |
| 335 | } |
| 336 | |
| 337 | static struct mc_device *mconsole_find_dev(char *name) |
| 338 | { |
| 339 | struct list_head *ele; |
| 340 | struct mc_device *dev; |
| 341 | |
| 342 | list_for_each(ele, &mconsole_devices){ |
| 343 | dev = list_entry(ele, struct mc_device, list); |
| 344 | if(!strncmp(name, dev->name, strlen(dev->name))) |
| 345 | return(dev); |
| 346 | } |
| 347 | return(NULL); |
| 348 | } |
| 349 | |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 350 | #define UNPLUGGED_PER_PAGE \ |
| 351 | ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) |
| 352 | |
| 353 | struct unplugged_pages { |
| 354 | struct list_head list; |
| 355 | void *pages[UNPLUGGED_PER_PAGE]; |
| 356 | }; |
| 357 | |
| 358 | static unsigned long long unplugged_pages_count = 0; |
| 359 | static struct list_head unplugged_pages = LIST_HEAD_INIT(unplugged_pages); |
| 360 | static int unplug_index = UNPLUGGED_PER_PAGE; |
| 361 | |
| 362 | static int mem_config(char *str) |
| 363 | { |
| 364 | unsigned long long diff; |
| 365 | int err = -EINVAL, i, add; |
| 366 | char *ret; |
| 367 | |
| 368 | if(str[0] != '=') |
| 369 | goto out; |
| 370 | |
| 371 | str++; |
| 372 | if(str[0] == '-') |
| 373 | add = 0; |
| 374 | else if(str[0] == '+'){ |
| 375 | add = 1; |
| 376 | } |
| 377 | else goto out; |
| 378 | |
| 379 | str++; |
| 380 | diff = memparse(str, &ret); |
| 381 | if(*ret != '\0') |
| 382 | goto out; |
| 383 | |
| 384 | diff /= PAGE_SIZE; |
| 385 | |
| 386 | for(i = 0; i < diff; i++){ |
| 387 | struct unplugged_pages *unplugged; |
| 388 | void *addr; |
| 389 | |
| 390 | if(add){ |
| 391 | if(list_empty(&unplugged_pages)) |
| 392 | break; |
| 393 | |
| 394 | unplugged = list_entry(unplugged_pages.next, |
| 395 | struct unplugged_pages, list); |
| 396 | if(unplug_index > 0) |
| 397 | addr = unplugged->pages[--unplug_index]; |
| 398 | else { |
| 399 | list_del(&unplugged->list); |
| 400 | addr = unplugged; |
| 401 | unplug_index = UNPLUGGED_PER_PAGE; |
| 402 | } |
| 403 | |
| 404 | free_page((unsigned long) addr); |
| 405 | unplugged_pages_count--; |
| 406 | } |
| 407 | else { |
| 408 | struct page *page; |
| 409 | |
| 410 | page = alloc_page(GFP_ATOMIC); |
| 411 | if(page == NULL) |
| 412 | break; |
| 413 | |
| 414 | unplugged = page_address(page); |
| 415 | if(unplug_index == UNPLUGGED_PER_PAGE){ |
Jeff Dike | 02dea08 | 2006-03-31 02:30:08 -0800 | [diff] [blame] | 416 | list_add(&unplugged->list, &unplugged_pages); |
| 417 | unplug_index = 0; |
| 418 | } |
| 419 | else { |
| 420 | struct list_head *entry = unplugged_pages.next; |
| 421 | addr = unplugged; |
| 422 | |
| 423 | unplugged = list_entry(entry, |
| 424 | struct unplugged_pages, |
| 425 | list); |
| 426 | unplugged->pages[unplug_index++] = addr; |
| 427 | err = os_drop_memory(addr, PAGE_SIZE); |
| 428 | if(err) |
| 429 | printk("Failed to release memory - " |
| 430 | "errno = %d\n", err); |
| 431 | } |
| 432 | |
| 433 | unplugged_pages_count++; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | err = 0; |
| 438 | out: |
| 439 | return err; |
| 440 | } |
| 441 | |
| 442 | static int mem_get_config(char *name, char *str, int size, char **error_out) |
| 443 | { |
| 444 | char buf[sizeof("18446744073709551615")]; |
| 445 | int len = 0; |
| 446 | |
| 447 | sprintf(buf, "%ld", uml_physmem); |
| 448 | CONFIG_CHUNK(str, size, len, buf, 1); |
| 449 | |
| 450 | return len; |
| 451 | } |
| 452 | |
| 453 | static int mem_id(char **str, int *start_out, int *end_out) |
| 454 | { |
| 455 | *start_out = 0; |
| 456 | *end_out = 0; |
| 457 | |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | static int mem_remove(int n) |
| 462 | { |
| 463 | return -EBUSY; |
| 464 | } |
| 465 | |
| 466 | static struct mc_device mem_mc = { |
| 467 | .name = "mem", |
| 468 | .config = mem_config, |
| 469 | .get_config = mem_get_config, |
| 470 | .id = mem_id, |
| 471 | .remove = mem_remove, |
| 472 | }; |
| 473 | |
| 474 | static int mem_mc_init(void) |
| 475 | { |
| 476 | if(can_drop_memory()) |
| 477 | mconsole_register_dev(&mem_mc); |
| 478 | else printk("Can't release memory to the host - memory hotplug won't " |
| 479 | "be supported\n"); |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | __initcall(mem_mc_init); |
| 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | #define CONFIG_BUF_SIZE 64 |
| 486 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 487 | static void mconsole_get_config(int (*get_config)(char *, char *, int, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | char **), |
| 489 | struct mc_request *req, char *name) |
| 490 | { |
| 491 | char default_buf[CONFIG_BUF_SIZE], *error, *buf; |
| 492 | int n, size; |
| 493 | |
| 494 | if(get_config == NULL){ |
| 495 | mconsole_reply(req, "No get_config routine defined", 1, 0); |
| 496 | return; |
| 497 | } |
| 498 | |
| 499 | error = NULL; |
| 500 | size = sizeof(default_buf)/sizeof(default_buf[0]); |
| 501 | buf = default_buf; |
| 502 | |
| 503 | while(1){ |
| 504 | n = (*get_config)(name, buf, size, &error); |
| 505 | if(error != NULL){ |
| 506 | mconsole_reply(req, error, 1, 0); |
| 507 | goto out; |
| 508 | } |
| 509 | |
| 510 | if(n <= size){ |
| 511 | mconsole_reply(req, buf, 0, 0); |
| 512 | goto out; |
| 513 | } |
| 514 | |
| 515 | if(buf != default_buf) |
| 516 | kfree(buf); |
| 517 | |
| 518 | size = n; |
| 519 | buf = kmalloc(size, GFP_KERNEL); |
| 520 | if(buf == NULL){ |
| 521 | mconsole_reply(req, "Failed to allocate buffer", 1, 0); |
| 522 | return; |
| 523 | } |
| 524 | } |
| 525 | out: |
| 526 | if(buf != default_buf) |
| 527 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | void mconsole_config(struct mc_request *req) |
| 531 | { |
| 532 | struct mc_device *dev; |
| 533 | char *ptr = req->request.data, *name; |
| 534 | int err; |
| 535 | |
| 536 | ptr += strlen("config"); |
| 537 | while(isspace(*ptr)) ptr++; |
| 538 | dev = mconsole_find_dev(ptr); |
| 539 | if(dev == NULL){ |
| 540 | mconsole_reply(req, "Bad configuration option", 1, 0); |
| 541 | return; |
| 542 | } |
| 543 | |
| 544 | name = &ptr[strlen(dev->name)]; |
| 545 | ptr = name; |
| 546 | while((*ptr != '=') && (*ptr != '\0')) |
| 547 | ptr++; |
| 548 | |
| 549 | if(*ptr == '='){ |
| 550 | err = (*dev->config)(name); |
| 551 | mconsole_reply(req, "", err, 0); |
| 552 | } |
| 553 | else mconsole_get_config(dev->get_config, req, name); |
| 554 | } |
| 555 | |
| 556 | void mconsole_remove(struct mc_request *req) |
| 557 | { |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 558 | struct mc_device *dev; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 559 | char *ptr = req->request.data, *err_msg = ""; |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 560 | char error[256]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 561 | int err, start, end, n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
| 563 | ptr += strlen("remove"); |
| 564 | while(isspace(*ptr)) ptr++; |
| 565 | dev = mconsole_find_dev(ptr); |
| 566 | if(dev == NULL){ |
| 567 | mconsole_reply(req, "Bad remove option", 1, 0); |
| 568 | return; |
| 569 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 570 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 571 | ptr = &ptr[strlen(dev->name)]; |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 572 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 573 | err = 1; |
| 574 | n = (*dev->id)(&ptr, &start, &end); |
| 575 | if(n < 0){ |
| 576 | err_msg = "Couldn't parse device number"; |
| 577 | goto out; |
| 578 | } |
| 579 | else if((n < start) || (n > end)){ |
| 580 | sprintf(error, "Invalid device number - must be between " |
| 581 | "%d and %d", start, end); |
| 582 | err_msg = error; |
| 583 | goto out; |
| 584 | } |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 585 | |
| 586 | err = (*dev->remove)(n); |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 587 | switch(err){ |
| 588 | case -ENODEV: |
| 589 | err_msg = "Device doesn't exist"; |
| 590 | break; |
| 591 | case -EBUSY: |
| 592 | err_msg = "Device is currently open"; |
| 593 | break; |
| 594 | default: |
| 595 | break; |
| 596 | } |
| 597 | out: |
Jeff Dike | 29d56cf | 2005-06-25 14:55:25 -0700 | [diff] [blame] | 598 | mconsole_reply(req, err_msg, err, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
| 600 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 601 | static DEFINE_SPINLOCK(console_lock); |
| 602 | static LIST_HEAD(clients); |
| 603 | static char console_buf[MCONSOLE_MAX_DATA]; |
| 604 | static int console_index = 0; |
| 605 | |
| 606 | static void console_write(struct console *console, const char *string, |
| 607 | unsigned len) |
| 608 | { |
| 609 | struct list_head *ele; |
| 610 | int n; |
| 611 | |
| 612 | if(list_empty(&clients)) |
| 613 | return; |
| 614 | |
| 615 | while(1){ |
Paolo 'Blaisorblade' Giarrusso | 6dad2d3 | 2006-04-10 22:53:31 -0700 | [diff] [blame] | 616 | n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index); |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 617 | strncpy(&console_buf[console_index], string, n); |
| 618 | console_index += n; |
| 619 | string += n; |
| 620 | len -= n; |
| 621 | if(len == 0) |
| 622 | return; |
| 623 | |
| 624 | list_for_each(ele, &clients){ |
| 625 | struct mconsole_entry *entry; |
| 626 | |
| 627 | entry = list_entry(ele, struct mconsole_entry, list); |
| 628 | mconsole_reply_len(&entry->request, console_buf, |
| 629 | console_index, 0, 1); |
| 630 | } |
| 631 | |
| 632 | console_index = 0; |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | static struct console mc_console = { .name = "mc", |
| 637 | .write = console_write, |
Jeff Dike | a174b30 | 2006-01-11 12:17:28 -0800 | [diff] [blame] | 638 | .flags = CON_ENABLED, |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 639 | .index = -1 }; |
| 640 | |
| 641 | static int mc_add_console(void) |
| 642 | { |
| 643 | register_console(&mc_console); |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | late_initcall(mc_add_console); |
| 648 | |
| 649 | static void with_console(struct mc_request *req, void (*proc)(void *), |
| 650 | void *arg) |
| 651 | { |
| 652 | struct mconsole_entry entry; |
| 653 | unsigned long flags; |
| 654 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 655 | entry.request = *req; |
| 656 | list_add(&entry.list, &clients); |
| 657 | spin_lock_irqsave(&console_lock, flags); |
| 658 | |
| 659 | (*proc)(arg); |
| 660 | |
| 661 | mconsole_reply_len(req, console_buf, console_index, 0, 0); |
| 662 | console_index = 0; |
| 663 | |
| 664 | spin_unlock_irqrestore(&console_lock, flags); |
| 665 | list_del(&entry.list); |
| 666 | } |
| 667 | |
Jeff Dike | 4111b02 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 668 | #ifdef CONFIG_MAGIC_SYSRQ |
| 669 | static void sysrq_proc(void *arg) |
| 670 | { |
| 671 | char *op = arg; |
| 672 | |
| 673 | handle_sysrq(*op, ¤t->thread.regs, NULL); |
| 674 | } |
| 675 | |
| 676 | void mconsole_sysrq(struct mc_request *req) |
| 677 | { |
| 678 | char *ptr = req->request.data; |
| 679 | |
| 680 | ptr += strlen("sysrq"); |
| 681 | while(isspace(*ptr)) ptr++; |
| 682 | |
| 683 | /* With 'b', the system will shut down without a chance to reply, |
| 684 | * so in this case, we reply first. |
| 685 | */ |
| 686 | if(*ptr == 'b') |
| 687 | mconsole_reply(req, "", 0, 0); |
| 688 | |
| 689 | with_console(req, sysrq_proc, ptr); |
| 690 | } |
| 691 | #else |
| 692 | void mconsole_sysrq(struct mc_request *req) |
| 693 | { |
| 694 | mconsole_reply(req, "Sysrq not compiled in", 1, 0); |
| 695 | } |
| 696 | #endif |
| 697 | |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 698 | #ifdef CONFIG_MODE_SKAS |
| 699 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 700 | static void stack_proc(void *arg) |
| 701 | { |
| 702 | struct task_struct *from = current, *to = arg; |
| 703 | |
| 704 | to->thread.saved_task = from; |
| 705 | switch_to(from, to, from); |
| 706 | } |
| 707 | |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 708 | /* Mconsole stack trace |
| 709 | * Added by Allan Graves, Jeff Dike |
| 710 | * Dumps a stacks registers to the linux console. |
| 711 | * Usage stack <pid>. |
| 712 | */ |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 713 | static void do_stack_trace(struct mc_request *req) |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 714 | { |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 715 | char *ptr = req->request.data; |
| 716 | int pid_requested= -1; |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 717 | struct task_struct *from = NULL; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 718 | struct task_struct *to = NULL; |
| 719 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 720 | /* Would be nice: |
| 721 | * 1) Send showregs output to mconsole. |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 722 | * 2) Add a way to stack dump all pids. |
| 723 | */ |
| 724 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 725 | ptr += strlen("stack"); |
| 726 | while(isspace(*ptr)) ptr++; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 727 | |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 728 | /* Should really check for multiple pids or reject bad args here */ |
| 729 | /* What do the arguments in mconsole_reply mean? */ |
| 730 | if(sscanf(ptr, "%d", &pid_requested) == 0){ |
| 731 | mconsole_reply(req, "Please specify a pid", 1, 0); |
| 732 | return; |
| 733 | } |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 734 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 735 | from = current; |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 736 | |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 737 | to = find_task_by_pid(pid_requested); |
Jeff Dike | 3a331a5 | 2006-01-06 00:19:05 -0800 | [diff] [blame] | 738 | if((to == NULL) || (pid_requested == 0)) { |
| 739 | mconsole_reply(req, "Couldn't find that pid", 1, 0); |
| 740 | return; |
| 741 | } |
Jeff Dike | 6f517d3 | 2006-01-06 00:19:04 -0800 | [diff] [blame] | 742 | with_console(req, stack_proc, to); |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 743 | } |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 744 | #endif /* CONFIG_MODE_SKAS */ |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 745 | |
| 746 | void mconsole_stack(struct mc_request *req) |
| 747 | { |
| 748 | /* This command doesn't work in TT mode, so let's check and then |
| 749 | * get out of here |
| 750 | */ |
| 751 | CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", |
| 752 | 1, 0), |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 753 | do_stack_trace(req)); |
Jeff Dike | 3eddddc | 2005-09-16 19:27:46 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | /* Changed by mconsole_setup, which is __setup, and called before SMP is |
| 757 | * active. |
| 758 | */ |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 759 | static char *notify_socket = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
Jeff Dike | 9010772 | 2006-01-06 00:18:54 -0800 | [diff] [blame] | 761 | static int mconsole_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | { |
| 763 | /* long to avoid size mismatch warnings from gcc */ |
| 764 | long sock; |
| 765 | int err; |
| 766 | char file[256]; |
| 767 | |
| 768 | if(umid_file_name("mconsole", file, sizeof(file))) return(-1); |
| 769 | snprintf(mconsole_socket_name, sizeof(file), "%s", file); |
| 770 | |
| 771 | sock = os_create_unix_socket(file, sizeof(file), 1); |
| 772 | if (sock < 0){ |
| 773 | printk("Failed to initialize management console\n"); |
| 774 | return(1); |
| 775 | } |
| 776 | |
| 777 | register_reboot_notifier(&reboot_notifier); |
| 778 | |
| 779 | err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, |
| 780 | SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, |
| 781 | "mconsole", (void *)sock); |
| 782 | if (err){ |
| 783 | printk("Failed to get IRQ for management console\n"); |
| 784 | return(1); |
| 785 | } |
| 786 | |
| 787 | if(notify_socket != NULL){ |
Jeff Dike | 970d6e3 | 2006-01-06 00:18:48 -0800 | [diff] [blame] | 788 | notify_socket = kstrdup(notify_socket, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | if(notify_socket != NULL) |
| 790 | mconsole_notify(notify_socket, MCONSOLE_SOCKET, |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 791 | mconsole_socket_name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | strlen(mconsole_socket_name) + 1); |
| 793 | else printk(KERN_ERR "mconsole_setup failed to strdup " |
| 794 | "string\n"); |
| 795 | } |
| 796 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 797 | printk("mconsole (version %d) initialized on %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | MCONSOLE_VERSION, mconsole_socket_name); |
| 799 | return(0); |
| 800 | } |
| 801 | |
| 802 | __initcall(mconsole_init); |
| 803 | |
| 804 | static int write_proc_mconsole(struct file *file, const char __user *buffer, |
| 805 | unsigned long count, void *data) |
| 806 | { |
| 807 | char *buf; |
| 808 | |
| 809 | buf = kmalloc(count + 1, GFP_KERNEL); |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 810 | if(buf == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | return(-ENOMEM); |
| 812 | |
| 813 | if(copy_from_user(buf, buffer, count)){ |
| 814 | count = -EFAULT; |
| 815 | goto out; |
| 816 | } |
| 817 | |
| 818 | buf[count] = '\0'; |
| 819 | |
| 820 | mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); |
| 821 | out: |
| 822 | kfree(buf); |
| 823 | return(count); |
| 824 | } |
| 825 | |
| 826 | static int create_proc_mconsole(void) |
| 827 | { |
| 828 | struct proc_dir_entry *ent; |
| 829 | |
| 830 | if(notify_socket == NULL) return(0); |
| 831 | |
| 832 | ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); |
| 833 | if(ent == NULL){ |
Christophe Lucas | 30f417c | 2005-07-28 21:16:12 -0700 | [diff] [blame] | 834 | printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | return(0); |
| 836 | } |
| 837 | |
| 838 | ent->read_proc = NULL; |
| 839 | ent->write_proc = write_proc_mconsole; |
| 840 | return(0); |
| 841 | } |
| 842 | |
| 843 | static DEFINE_SPINLOCK(notify_spinlock); |
| 844 | |
| 845 | void lock_notify(void) |
| 846 | { |
| 847 | spin_lock(¬ify_spinlock); |
| 848 | } |
| 849 | |
| 850 | void unlock_notify(void) |
| 851 | { |
| 852 | spin_unlock(¬ify_spinlock); |
| 853 | } |
| 854 | |
| 855 | __initcall(create_proc_mconsole); |
| 856 | |
| 857 | #define NOTIFY "=notify:" |
| 858 | |
| 859 | static int mconsole_setup(char *str) |
| 860 | { |
| 861 | if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ |
| 862 | str += strlen(NOTIFY); |
| 863 | notify_socket = str; |
| 864 | } |
| 865 | else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); |
| 866 | return(1); |
| 867 | } |
| 868 | |
| 869 | __setup("mconsole", mconsole_setup); |
| 870 | |
| 871 | __uml_help(mconsole_setup, |
| 872 | "mconsole=notify:<socket>\n" |
| 873 | " Requests that the mconsole driver send a message to the named Unix\n" |
| 874 | " socket containing the name of the mconsole socket. This also serves\n" |
| 875 | " to notify outside processes when UML has booted far enough to respond\n" |
| 876 | " to mconsole requests.\n\n" |
| 877 | ); |
| 878 | |
| 879 | static int notify_panic(struct notifier_block *self, unsigned long unused1, |
| 880 | void *ptr) |
| 881 | { |
| 882 | char *message = ptr; |
| 883 | |
| 884 | if(notify_socket == NULL) return(0); |
| 885 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 886 | mconsole_notify(notify_socket, MCONSOLE_PANIC, message, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | strlen(message) + 1); |
| 888 | return(0); |
| 889 | } |
| 890 | |
| 891 | static struct notifier_block panic_exit_notifier = { |
| 892 | .notifier_call = notify_panic, |
| 893 | .next = NULL, |
| 894 | .priority = 1 |
| 895 | }; |
| 896 | |
| 897 | static int add_notifier(void) |
| 898 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 899 | atomic_notifier_chain_register(&panic_notifier_list, |
| 900 | &panic_exit_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | return(0); |
| 902 | } |
| 903 | |
| 904 | __initcall(add_notifier); |
| 905 | |
| 906 | char *mconsole_notify_socket(void) |
| 907 | { |
| 908 | return(notify_socket); |
| 909 | } |
| 910 | |
| 911 | EXPORT_SYMBOL(mconsole_notify_socket); |