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" 23 #include "linux/list.h" 24 #include "linux/mm.h" 25 #include "linux/console.h" 26 #include "asm/irq.h" 27 #include "asm/uaccess.h" 28 #include "kern_util.h" 29 #include "kern.h" 30 #include "mconsole.h" 31 #include "mconsole_kern.h" 32 #include "irq_user.h" 33 #include "init.h" 34 #include "os.h" 35 #include "irq_kern.h" 36 #include "choose-mode.h" 37 38 static int do_unlink_socket(struct notifier_block *notifier, 39 unsigned long what, void *data) 40 { 41 return(mconsole_unlink_socket()); 42 } 43 44 45 static struct notifier_block reboot_notifier = { 46 .notifier_call = do_unlink_socket, 47 .priority = 0, 48 }; 49 50 /* Safe without explicit locking for now. Tasklets provide their own 51 * locking, and the interrupt handler is safe because it can't interrupt 52 * itself and it can only happen on CPU 0. 53 */ 54 55 static LIST_HEAD(mc_requests); 56 57 static void mc_work_proc(struct work_struct *unused) 58 { 59 struct mconsole_entry *req; 60 unsigned long flags; 61 62 while(!list_empty(&mc_requests)){ 63 local_irq_save(flags); 64 req = list_entry(mc_requests.next, struct mconsole_entry, 65 list); 66 list_del(&req->list); 67 local_irq_restore(flags); 68 req->request.cmd->handler(&req->request); 69 kfree(req); 70 } 71 } 72 73 static DECLARE_WORK(mconsole_work, mc_work_proc); 74 75 static irqreturn_t mconsole_interrupt(int irq, void *dev_id) 76 { 77 /* long to avoid size mismatch warnings from gcc */ 78 long fd; 79 struct mconsole_entry *new; 80 static struct mc_request req; /* that's OK */ 81 82 fd = (long) dev_id; 83 while (mconsole_get_request(fd, &req)){ 84 if(req.cmd->context == MCONSOLE_INTR) 85 (*req.cmd->handler)(&req); 86 else { 87 new = kmalloc(sizeof(*new), GFP_NOWAIT); 88 if(new == NULL) 89 mconsole_reply(&req, "Out of memory", 1, 0); 90 else { 91 new->request = req; 92 new->request.regs = get_irq_regs()->regs; 93 list_add(&new->list, &mc_requests); 94 } 95 } 96 } 97 if(!list_empty(&mc_requests)) 98 schedule_work(&mconsole_work); 99 reactivate_fd(fd, MCONSOLE_IRQ); 100 return(IRQ_HANDLED); 101 } 102 103 void mconsole_version(struct mc_request *req) 104 { 105 char version[256]; 106 107 sprintf(version, "%s %s %s %s %s", utsname()->sysname, 108 utsname()->nodename, utsname()->release, 109 utsname()->version, utsname()->machine); 110 mconsole_reply(req, version, 0, 0); 111 } 112 113 void mconsole_log(struct mc_request *req) 114 { 115 int len; 116 char *ptr = req->request.data; 117 118 ptr += strlen("log "); 119 120 len = req->len - (ptr - req->request.data); 121 printk("%.*s", len, ptr); 122 mconsole_reply(req, "", 0, 0); 123 } 124 125 /* This is a more convoluted version of mconsole_proc, which has some stability 126 * problems; however, we need it fixed, because it is expected that UML users 127 * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still 128 * show the real procfs content, not the ones from hppfs.*/ 129 #if 0 130 void mconsole_proc(struct mc_request *req) 131 { 132 struct nameidata nd; 133 struct file_system_type *proc; 134 struct super_block *super; 135 struct file *file; 136 int n, err; 137 char *ptr = req->request.data, *buf; 138 139 ptr += strlen("proc"); 140 while(isspace(*ptr)) ptr++; 141 142 proc = get_fs_type("proc"); 143 if(proc == NULL){ 144 mconsole_reply(req, "procfs not registered", 1, 0); 145 goto out; 146 } 147 148 super = (*proc->get_sb)(proc, 0, NULL, NULL); 149 put_filesystem(proc); 150 if(super == NULL){ 151 mconsole_reply(req, "Failed to get procfs superblock", 1, 0); 152 goto out; 153 } 154 up_write(&super->s_umount); 155 156 nd.dentry = super->s_root; 157 nd.mnt = NULL; 158 nd.flags = O_RDONLY + 1; 159 nd.last_type = LAST_ROOT; 160 161 /* START: it was experienced that the stability problems are closed 162 * if commenting out these two calls + the below read cycle. To 163 * make UML crash again, it was enough to readd either one.*/ 164 err = link_path_walk(ptr, &nd); 165 if(err){ 166 mconsole_reply(req, "Failed to look up file", 1, 0); 167 goto out_kill; 168 } 169 170 file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); 171 if(IS_ERR(file)){ 172 mconsole_reply(req, "Failed to open file", 1, 0); 173 goto out_kill; 174 } 175 /*END*/ 176 177 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 178 if(buf == NULL){ 179 mconsole_reply(req, "Failed to allocate buffer", 1, 0); 180 goto out_fput; 181 } 182 183 if((file->f_op != NULL) && (file->f_op->read != NULL)){ 184 do { 185 n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, 186 &file->f_pos); 187 if(n >= 0){ 188 buf[n] = '\0'; 189 mconsole_reply(req, buf, 0, (n > 0)); 190 } 191 else { 192 mconsole_reply(req, "Read of file failed", 193 1, 0); 194 goto out_free; 195 } 196 } while(n > 0); 197 } 198 else mconsole_reply(req, "", 0, 0); 199 200 out_free: 201 kfree(buf); 202 out_fput: 203 fput(file); 204 out_kill: 205 deactivate_super(super); 206 out: ; 207 } 208 #endif 209 210 void mconsole_proc(struct mc_request *req) 211 { 212 char path[64]; 213 char *buf; 214 int len; 215 int fd; 216 int first_chunk = 1; 217 char *ptr = req->request.data; 218 219 ptr += strlen("proc"); 220 while(isspace(*ptr)) ptr++; 221 snprintf(path, sizeof(path), "/proc/%s", ptr); 222 223 fd = sys_open(path, 0, 0); 224 if (fd < 0) { 225 mconsole_reply(req, "Failed to open file", 1, 0); 226 printk("open %s: %d\n",path,fd); 227 goto out; 228 } 229 230 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 231 if(buf == NULL){ 232 mconsole_reply(req, "Failed to allocate buffer", 1, 0); 233 goto out_close; 234 } 235 236 for (;;) { 237 len = sys_read(fd, buf, PAGE_SIZE-1); 238 if (len < 0) { 239 mconsole_reply(req, "Read of file failed", 1, 0); 240 goto out_free; 241 } 242 /*Begin the file content on his own line.*/ 243 if (first_chunk) { 244 mconsole_reply(req, "\n", 0, 1); 245 first_chunk = 0; 246 } 247 if (len == PAGE_SIZE-1) { 248 buf[len] = '\0'; 249 mconsole_reply(req, buf, 0, 1); 250 } else { 251 buf[len] = '\0'; 252 mconsole_reply(req, buf, 0, 0); 253 break; 254 } 255 } 256 257 out_free: 258 kfree(buf); 259 out_close: 260 sys_close(fd); 261 out: 262 /* nothing */; 263 } 264 265 #define UML_MCONSOLE_HELPTEXT \ 266 "Commands: \n\ 267 version - Get kernel version \n\ 268 help - Print this message \n\ 269 halt - Halt UML \n\ 270 reboot - Reboot UML \n\ 271 config <dev>=<config> - Add a new device to UML; \n\ 272 same syntax as command line \n\ 273 config <dev> - Query the configuration of a device \n\ 274 remove <dev> - Remove a device from UML \n\ 275 sysrq <letter> - Performs the SysRq action controlled by the letter \n\ 276 cad - invoke the Ctrl-Alt-Del handler \n\ 277 stop - pause the UML; it will do nothing until it receives a 'go' \n\ 278 go - continue the UML after a 'stop' \n\ 279 log <string> - make UML enter <string> into the kernel log\n\ 280 proc <file> - returns the contents of the UML's /proc/<file>\n\ 281 stack <pid> - returns the stack of the specified pid\n\ 282 " 283 284 void mconsole_help(struct mc_request *req) 285 { 286 mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); 287 } 288 289 void mconsole_halt(struct mc_request *req) 290 { 291 mconsole_reply(req, "", 0, 0); 292 machine_halt(); 293 } 294 295 void mconsole_reboot(struct mc_request *req) 296 { 297 mconsole_reply(req, "", 0, 0); 298 machine_restart(NULL); 299 } 300 301 void mconsole_cad(struct mc_request *req) 302 { 303 mconsole_reply(req, "", 0, 0); 304 ctrl_alt_del(); 305 } 306 307 void mconsole_go(struct mc_request *req) 308 { 309 mconsole_reply(req, "Not stopped", 1, 0); 310 } 311 312 void mconsole_stop(struct mc_request *req) 313 { 314 deactivate_fd(req->originating_fd, MCONSOLE_IRQ); 315 os_set_fd_block(req->originating_fd, 1); 316 mconsole_reply(req, "stopped", 0, 0); 317 while (mconsole_get_request(req->originating_fd, req)) { 318 if (req->cmd->handler == mconsole_go) 319 break; 320 if (req->cmd->handler == mconsole_stop) { 321 mconsole_reply(req, "Already stopped", 1, 0); 322 continue; 323 } 324 if (req->cmd->handler == mconsole_sysrq) { 325 struct pt_regs *old_regs; 326 old_regs = set_irq_regs((struct pt_regs *)&req->regs); 327 mconsole_sysrq(req); 328 set_irq_regs(old_regs); 329 continue; 330 } 331 (*req->cmd->handler)(req); 332 } 333 os_set_fd_block(req->originating_fd, 0); 334 reactivate_fd(req->originating_fd, MCONSOLE_IRQ); 335 mconsole_reply(req, "", 0, 0); 336 } 337 338 static DEFINE_SPINLOCK(mc_devices_lock); 339 static LIST_HEAD(mconsole_devices); 340 341 void mconsole_register_dev(struct mc_device *new) 342 { 343 spin_lock(&mc_devices_lock); 344 BUG_ON(!list_empty(&new->list)); 345 list_add(&new->list, &mconsole_devices); 346 spin_unlock(&mc_devices_lock); 347 } 348 349 static struct mc_device *mconsole_find_dev(char *name) 350 { 351 struct list_head *ele; 352 struct mc_device *dev; 353 354 list_for_each(ele, &mconsole_devices){ 355 dev = list_entry(ele, struct mc_device, list); 356 if(!strncmp(name, dev->name, strlen(dev->name))) 357 return(dev); 358 } 359 return(NULL); 360 } 361 362 #define UNPLUGGED_PER_PAGE \ 363 ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) 364 365 struct unplugged_pages { 366 struct list_head list; 367 void *pages[UNPLUGGED_PER_PAGE]; 368 }; 369 370 static DECLARE_MUTEX(plug_mem_mutex); 371 static unsigned long long unplugged_pages_count = 0; 372 static LIST_HEAD(unplugged_pages); 373 static int unplug_index = UNPLUGGED_PER_PAGE; 374 375 static int mem_config(char *str, char **error_out) 376 { 377 unsigned long long diff; 378 int err = -EINVAL, i, add; 379 char *ret; 380 381 if(str[0] != '='){ 382 *error_out = "Expected '=' after 'mem'"; 383 goto out; 384 } 385 386 str++; 387 if(str[0] == '-') 388 add = 0; 389 else if(str[0] == '+'){ 390 add = 1; 391 } 392 else { 393 *error_out = "Expected increment to start with '-' or '+'"; 394 goto out; 395 } 396 397 str++; 398 diff = memparse(str, &ret); 399 if(*ret != '\0'){ 400 *error_out = "Failed to parse memory increment"; 401 goto out; 402 } 403 404 diff /= PAGE_SIZE; 405 406 down(&plug_mem_mutex); 407 for(i = 0; i < diff; i++){ 408 struct unplugged_pages *unplugged; 409 void *addr; 410 411 if(add){ 412 if(list_empty(&unplugged_pages)) 413 break; 414 415 unplugged = list_entry(unplugged_pages.next, 416 struct unplugged_pages, list); 417 if(unplug_index > 0) 418 addr = unplugged->pages[--unplug_index]; 419 else { 420 list_del(&unplugged->list); 421 addr = unplugged; 422 unplug_index = UNPLUGGED_PER_PAGE; 423 } 424 425 free_page((unsigned long) addr); 426 unplugged_pages_count--; 427 } 428 else { 429 struct page *page; 430 431 page = alloc_page(GFP_ATOMIC); 432 if(page == NULL) 433 break; 434 435 unplugged = page_address(page); 436 if(unplug_index == UNPLUGGED_PER_PAGE){ 437 list_add(&unplugged->list, &unplugged_pages); 438 unplug_index = 0; 439 } 440 else { 441 struct list_head *entry = unplugged_pages.next; 442 addr = unplugged; 443 444 unplugged = list_entry(entry, 445 struct unplugged_pages, 446 list); 447 err = os_drop_memory(addr, PAGE_SIZE); 448 if(err){ 449 printk("Failed to release memory - " 450 "errno = %d\n", err); 451 *error_out = "Failed to release memory"; 452 goto out_unlock; 453 } 454 unplugged->pages[unplug_index++] = addr; 455 } 456 457 unplugged_pages_count++; 458 } 459 } 460 461 err = 0; 462 out_unlock: 463 up(&plug_mem_mutex); 464 out: 465 return err; 466 } 467 468 static int mem_get_config(char *name, char *str, int size, char **error_out) 469 { 470 char buf[sizeof("18446744073709551615")]; 471 int len = 0; 472 473 sprintf(buf, "%ld", uml_physmem); 474 CONFIG_CHUNK(str, size, len, buf, 1); 475 476 return len; 477 } 478 479 static int mem_id(char **str, int *start_out, int *end_out) 480 { 481 *start_out = 0; 482 *end_out = 0; 483 484 return 0; 485 } 486 487 static int mem_remove(int n, char **error_out) 488 { 489 *error_out = "Memory doesn't support the remove operation"; 490 return -EBUSY; 491 } 492 493 static struct mc_device mem_mc = { 494 .list = LIST_HEAD_INIT(mem_mc.list), 495 .name = "mem", 496 .config = mem_config, 497 .get_config = mem_get_config, 498 .id = mem_id, 499 .remove = mem_remove, 500 }; 501 502 static int mem_mc_init(void) 503 { 504 if(can_drop_memory()) 505 mconsole_register_dev(&mem_mc); 506 else printk("Can't release memory to the host - memory hotplug won't " 507 "be supported\n"); 508 return 0; 509 } 510 511 __initcall(mem_mc_init); 512 513 #define CONFIG_BUF_SIZE 64 514 515 static void mconsole_get_config(int (*get_config)(char *, char *, int, 516 char **), 517 struct mc_request *req, char *name) 518 { 519 char default_buf[CONFIG_BUF_SIZE], *error, *buf; 520 int n, size; 521 522 if(get_config == NULL){ 523 mconsole_reply(req, "No get_config routine defined", 1, 0); 524 return; 525 } 526 527 error = NULL; 528 size = ARRAY_SIZE(default_buf); 529 buf = default_buf; 530 531 while(1){ 532 n = (*get_config)(name, buf, size, &error); 533 if(error != NULL){ 534 mconsole_reply(req, error, 1, 0); 535 goto out; 536 } 537 538 if(n <= size){ 539 mconsole_reply(req, buf, 0, 0); 540 goto out; 541 } 542 543 if(buf != default_buf) 544 kfree(buf); 545 546 size = n; 547 buf = kmalloc(size, GFP_KERNEL); 548 if(buf == NULL){ 549 mconsole_reply(req, "Failed to allocate buffer", 1, 0); 550 return; 551 } 552 } 553 out: 554 if(buf != default_buf) 555 kfree(buf); 556 } 557 558 void mconsole_config(struct mc_request *req) 559 { 560 struct mc_device *dev; 561 char *ptr = req->request.data, *name, *error_string = ""; 562 int err; 563 564 ptr += strlen("config"); 565 while(isspace(*ptr)) ptr++; 566 dev = mconsole_find_dev(ptr); 567 if(dev == NULL){ 568 mconsole_reply(req, "Bad configuration option", 1, 0); 569 return; 570 } 571 572 name = &ptr[strlen(dev->name)]; 573 ptr = name; 574 while((*ptr != '=') && (*ptr != '\0')) 575 ptr++; 576 577 if(*ptr == '='){ 578 err = (*dev->config)(name, &error_string); 579 mconsole_reply(req, error_string, err, 0); 580 } 581 else mconsole_get_config(dev->get_config, req, name); 582 } 583 584 void mconsole_remove(struct mc_request *req) 585 { 586 struct mc_device *dev; 587 char *ptr = req->request.data, *err_msg = ""; 588 char error[256]; 589 int err, start, end, n; 590 591 ptr += strlen("remove"); 592 while(isspace(*ptr)) ptr++; 593 dev = mconsole_find_dev(ptr); 594 if(dev == NULL){ 595 mconsole_reply(req, "Bad remove option", 1, 0); 596 return; 597 } 598 599 ptr = &ptr[strlen(dev->name)]; 600 601 err = 1; 602 n = (*dev->id)(&ptr, &start, &end); 603 if(n < 0){ 604 err_msg = "Couldn't parse device number"; 605 goto out; 606 } 607 else if((n < start) || (n > end)){ 608 sprintf(error, "Invalid device number - must be between " 609 "%d and %d", start, end); 610 err_msg = error; 611 goto out; 612 } 613 614 err_msg = NULL; 615 err = (*dev->remove)(n, &err_msg); 616 switch(err){ 617 case 0: 618 err_msg = ""; 619 break; 620 case -ENODEV: 621 if(err_msg == NULL) 622 err_msg = "Device doesn't exist"; 623 break; 624 case -EBUSY: 625 if(err_msg == NULL) 626 err_msg = "Device is currently open"; 627 break; 628 default: 629 break; 630 } 631 out: 632 mconsole_reply(req, err_msg, err, 0); 633 } 634 635 struct mconsole_output { 636 struct list_head list; 637 struct mc_request *req; 638 }; 639 640 static DEFINE_SPINLOCK(client_lock); 641 static LIST_HEAD(clients); 642 static char console_buf[MCONSOLE_MAX_DATA]; 643 static int console_index = 0; 644 645 static void console_write(struct console *console, const char *string, 646 unsigned len) 647 { 648 struct list_head *ele; 649 int n; 650 651 if(list_empty(&clients)) 652 return; 653 654 while(1){ 655 n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index); 656 strncpy(&console_buf[console_index], string, n); 657 console_index += n; 658 string += n; 659 len -= n; 660 if(len == 0) 661 return; 662 663 list_for_each(ele, &clients){ 664 struct mconsole_output *entry; 665 666 entry = list_entry(ele, struct mconsole_output, list); 667 mconsole_reply_len(entry->req, console_buf, 668 console_index, 0, 1); 669 } 670 671 console_index = 0; 672 } 673 } 674 675 static struct console mc_console = { .name = "mc", 676 .write = console_write, 677 .flags = CON_ENABLED, 678 .index = -1 }; 679 680 static int mc_add_console(void) 681 { 682 register_console(&mc_console); 683 return 0; 684 } 685 686 late_initcall(mc_add_console); 687 688 static void with_console(struct mc_request *req, void (*proc)(void *), 689 void *arg) 690 { 691 struct mconsole_output entry; 692 unsigned long flags; 693 694 entry.req = req; 695 spin_lock_irqsave(&client_lock, flags); 696 list_add(&entry.list, &clients); 697 spin_unlock_irqrestore(&client_lock, flags); 698 699 (*proc)(arg); 700 701 mconsole_reply_len(req, console_buf, console_index, 0, 0); 702 console_index = 0; 703 704 spin_lock_irqsave(&client_lock, flags); 705 list_del(&entry.list); 706 spin_unlock_irqrestore(&client_lock, flags); 707 } 708 709 #ifdef CONFIG_MAGIC_SYSRQ 710 static void sysrq_proc(void *arg) 711 { 712 char *op = arg; 713 handle_sysrq(*op, NULL); 714 } 715 716 void mconsole_sysrq(struct mc_request *req) 717 { 718 char *ptr = req->request.data; 719 720 ptr += strlen("sysrq"); 721 while(isspace(*ptr)) ptr++; 722 723 /* With 'b', the system will shut down without a chance to reply, 724 * so in this case, we reply first. 725 */ 726 if(*ptr == 'b') 727 mconsole_reply(req, "", 0, 0); 728 729 with_console(req, sysrq_proc, ptr); 730 } 731 #else 732 void mconsole_sysrq(struct mc_request *req) 733 { 734 mconsole_reply(req, "Sysrq not compiled in", 1, 0); 735 } 736 #endif 737 738 #ifdef CONFIG_MODE_SKAS 739 740 static void stack_proc(void *arg) 741 { 742 struct task_struct *from = current, *to = arg; 743 744 to->thread.saved_task = from; 745 switch_to(from, to, from); 746 } 747 748 /* Mconsole stack trace 749 * Added by Allan Graves, Jeff Dike 750 * Dumps a stacks registers to the linux console. 751 * Usage stack <pid>. 752 */ 753 static void do_stack_trace(struct mc_request *req) 754 { 755 char *ptr = req->request.data; 756 int pid_requested= -1; 757 struct task_struct *from = NULL; 758 struct task_struct *to = NULL; 759 760 /* Would be nice: 761 * 1) Send showregs output to mconsole. 762 * 2) Add a way to stack dump all pids. 763 */ 764 765 ptr += strlen("stack"); 766 while(isspace(*ptr)) ptr++; 767 768 /* Should really check for multiple pids or reject bad args here */ 769 /* What do the arguments in mconsole_reply mean? */ 770 if(sscanf(ptr, "%d", &pid_requested) == 0){ 771 mconsole_reply(req, "Please specify a pid", 1, 0); 772 return; 773 } 774 775 from = current; 776 777 to = find_task_by_pid(pid_requested); 778 if((to == NULL) || (pid_requested == 0)) { 779 mconsole_reply(req, "Couldn't find that pid", 1, 0); 780 return; 781 } 782 with_console(req, stack_proc, to); 783 } 784 #endif /* CONFIG_MODE_SKAS */ 785 786 void mconsole_stack(struct mc_request *req) 787 { 788 /* This command doesn't work in TT mode, so let's check and then 789 * get out of here 790 */ 791 CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", 792 1, 0), 793 do_stack_trace(req)); 794 } 795 796 /* Changed by mconsole_setup, which is __setup, and called before SMP is 797 * active. 798 */ 799 static char *notify_socket = NULL; 800 801 static int mconsole_init(void) 802 { 803 /* long to avoid size mismatch warnings from gcc */ 804 long sock; 805 int err; 806 char file[256]; 807 808 if(umid_file_name("mconsole", file, sizeof(file))) return(-1); 809 snprintf(mconsole_socket_name, sizeof(file), "%s", file); 810 811 sock = os_create_unix_socket(file, sizeof(file), 1); 812 if (sock < 0){ 813 printk("Failed to initialize management console\n"); 814 return(1); 815 } 816 817 register_reboot_notifier(&reboot_notifier); 818 819 err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, 820 IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, 821 "mconsole", (void *)sock); 822 if (err){ 823 printk("Failed to get IRQ for management console\n"); 824 return(1); 825 } 826 827 if(notify_socket != NULL){ 828 notify_socket = kstrdup(notify_socket, GFP_KERNEL); 829 if(notify_socket != NULL) 830 mconsole_notify(notify_socket, MCONSOLE_SOCKET, 831 mconsole_socket_name, 832 strlen(mconsole_socket_name) + 1); 833 else printk(KERN_ERR "mconsole_setup failed to strdup " 834 "string\n"); 835 } 836 837 printk("mconsole (version %d) initialized on %s\n", 838 MCONSOLE_VERSION, mconsole_socket_name); 839 return(0); 840 } 841 842 __initcall(mconsole_init); 843 844 static int write_proc_mconsole(struct file *file, const char __user *buffer, 845 unsigned long count, void *data) 846 { 847 char *buf; 848 849 buf = kmalloc(count + 1, GFP_KERNEL); 850 if(buf == NULL) 851 return(-ENOMEM); 852 853 if(copy_from_user(buf, buffer, count)){ 854 count = -EFAULT; 855 goto out; 856 } 857 858 buf[count] = '\0'; 859 860 mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); 861 out: 862 kfree(buf); 863 return(count); 864 } 865 866 static int create_proc_mconsole(void) 867 { 868 struct proc_dir_entry *ent; 869 870 if(notify_socket == NULL) return(0); 871 872 ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); 873 if(ent == NULL){ 874 printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); 875 return(0); 876 } 877 878 ent->read_proc = NULL; 879 ent->write_proc = write_proc_mconsole; 880 return(0); 881 } 882 883 static DEFINE_SPINLOCK(notify_spinlock); 884 885 void lock_notify(void) 886 { 887 spin_lock(¬ify_spinlock); 888 } 889 890 void unlock_notify(void) 891 { 892 spin_unlock(¬ify_spinlock); 893 } 894 895 __initcall(create_proc_mconsole); 896 897 #define NOTIFY "=notify:" 898 899 static int mconsole_setup(char *str) 900 { 901 if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ 902 str += strlen(NOTIFY); 903 notify_socket = str; 904 } 905 else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); 906 return(1); 907 } 908 909 __setup("mconsole", mconsole_setup); 910 911 __uml_help(mconsole_setup, 912 "mconsole=notify:<socket>\n" 913 " Requests that the mconsole driver send a message to the named Unix\n" 914 " socket containing the name of the mconsole socket. This also serves\n" 915 " to notify outside processes when UML has booted far enough to respond\n" 916 " to mconsole requests.\n\n" 917 ); 918 919 static int notify_panic(struct notifier_block *self, unsigned long unused1, 920 void *ptr) 921 { 922 char *message = ptr; 923 924 if(notify_socket == NULL) return(0); 925 926 mconsole_notify(notify_socket, MCONSOLE_PANIC, message, 927 strlen(message) + 1); 928 return(0); 929 } 930 931 static struct notifier_block panic_exit_notifier = { 932 .notifier_call = notify_panic, 933 .next = NULL, 934 .priority = 1 935 }; 936 937 static int add_notifier(void) 938 { 939 atomic_notifier_chain_register(&panic_notifier_list, 940 &panic_exit_notifier); 941 return(0); 942 } 943 944 __initcall(add_notifier); 945 946 char *mconsole_notify_socket(void) 947 { 948 return(notify_socket); 949 } 950 951 EXPORT_SYMBOL(mconsole_notify_socket); 952