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 "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 "irq_kern.h" 37 #include "choose-mode.h" 38 39 static int do_unlink_socket(struct notifier_block *notifier, 40 unsigned long what, void *data) 41 { 42 return(mconsole_unlink_socket()); 43 } 44 45 46 static struct notifier_block reboot_notifier = { 47 .notifier_call = do_unlink_socket, 48 .priority = 0, 49 }; 50 51 /* Safe without explicit locking for now. Tasklets provide their own 52 * locking, and the interrupt handler is safe because it can't interrupt 53 * itself and it can only happen on CPU 0. 54 */ 55 56 static LIST_HEAD(mc_requests); 57 58 static void mc_work_proc(struct work_struct *unused) 59 { 60 struct mconsole_entry *req; 61 unsigned long flags; 62 63 while(!list_empty(&mc_requests)){ 64 local_irq_save(flags); 65 req = list_entry(mc_requests.next, struct mconsole_entry, 66 list); 67 list_del(&req->list); 68 local_irq_restore(flags); 69 req->request.cmd->handler(&req->request); 70 kfree(req); 71 } 72 } 73 74 static DECLARE_WORK(mconsole_work, mc_work_proc); 75 76 static irqreturn_t mconsole_interrupt(int irq, void *dev_id) 77 { 78 /* long to avoid size mismatch warnings from gcc */ 79 long fd; 80 struct mconsole_entry *new; 81 static struct mc_request req; /* that's OK */ 82 83 fd = (long) dev_id; 84 while (mconsole_get_request(fd, &req)){ 85 if(req.cmd->context == MCONSOLE_INTR) 86 (*req.cmd->handler)(&req); 87 else { 88 new = kmalloc(sizeof(*new), GFP_NOWAIT); 89 if(new == NULL) 90 mconsole_reply(&req, "Out of memory", 1, 0); 91 else { 92 new->request = req; 93 new->request.regs = get_irq_regs()->regs; 94 list_add(&new->list, &mc_requests); 95 } 96 } 97 } 98 if(!list_empty(&mc_requests)) 99 schedule_work(&mconsole_work); 100 reactivate_fd(fd, MCONSOLE_IRQ); 101 return(IRQ_HANDLED); 102 } 103 104 void mconsole_version(struct mc_request *req) 105 { 106 char version[256]; 107 108 sprintf(version, "%s %s %s %s %s", utsname()->sysname, 109 utsname()->nodename, utsname()->release, 110 utsname()->version, utsname()->machine); 111 mconsole_reply(req, version, 0, 0); 112 } 113 114 void mconsole_log(struct mc_request *req) 115 { 116 int len; 117 char *ptr = req->request.data; 118 119 ptr += strlen("log "); 120 121 len = req->len - (ptr - req->request.data); 122 printk("%.*s", len, ptr); 123 mconsole_reply(req, "", 0, 0); 124 } 125 126 /* This is a more convoluted version of mconsole_proc, which has some stability 127 * problems; however, we need it fixed, because it is expected that UML users 128 * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still 129 * show the real procfs content, not the ones from hppfs.*/ 130 #if 0 131 void mconsole_proc(struct mc_request *req) 132 { 133 struct nameidata nd; 134 struct file_system_type *proc; 135 struct super_block *super; 136 struct file *file; 137 int n, err; 138 char *ptr = req->request.data, *buf; 139 140 ptr += strlen("proc"); 141 while(isspace(*ptr)) ptr++; 142 143 proc = get_fs_type("proc"); 144 if(proc == NULL){ 145 mconsole_reply(req, "procfs not registered", 1, 0); 146 goto out; 147 } 148 149 super = (*proc->get_sb)(proc, 0, NULL, NULL); 150 put_filesystem(proc); 151 if(super == NULL){ 152 mconsole_reply(req, "Failed to get procfs superblock", 1, 0); 153 goto out; 154 } 155 up_write(&super->s_umount); 156 157 nd.dentry = super->s_root; 158 nd.mnt = NULL; 159 nd.flags = O_RDONLY + 1; 160 nd.last_type = LAST_ROOT; 161 162 /* START: it was experienced that the stability problems are closed 163 * if commenting out these two calls + the below read cycle. To 164 * make UML crash again, it was enough to readd either one.*/ 165 err = link_path_walk(ptr, &nd); 166 if(err){ 167 mconsole_reply(req, "Failed to look up file", 1, 0); 168 goto out_kill; 169 } 170 171 file = dentry_open(nd.dentry, nd.mnt, O_RDONLY); 172 if(IS_ERR(file)){ 173 mconsole_reply(req, "Failed to open file", 1, 0); 174 goto out_kill; 175 } 176 /*END*/ 177 178 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 179 if(buf == NULL){ 180 mconsole_reply(req, "Failed to allocate buffer", 1, 0); 181 goto out_fput; 182 } 183 184 if((file->f_op != NULL) && (file->f_op->read != NULL)){ 185 do { 186 n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1, 187 &file->f_pos); 188 if(n >= 0){ 189 buf[n] = '\0'; 190 mconsole_reply(req, buf, 0, (n > 0)); 191 } 192 else { 193 mconsole_reply(req, "Read of file failed", 194 1, 0); 195 goto out_free; 196 } 197 } while(n > 0); 198 } 199 else mconsole_reply(req, "", 0, 0); 200 201 out_free: 202 kfree(buf); 203 out_fput: 204 fput(file); 205 out_kill: 206 deactivate_super(super); 207 out: ; 208 } 209 #endif 210 211 void mconsole_proc(struct mc_request *req) 212 { 213 char path[64]; 214 char *buf; 215 int len; 216 int fd; 217 int first_chunk = 1; 218 char *ptr = req->request.data; 219 220 ptr += strlen("proc"); 221 while(isspace(*ptr)) ptr++; 222 snprintf(path, sizeof(path), "/proc/%s", ptr); 223 224 fd = sys_open(path, 0, 0); 225 if (fd < 0) { 226 mconsole_reply(req, "Failed to open file", 1, 0); 227 printk("open %s: %d\n",path,fd); 228 goto out; 229 } 230 231 buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 232 if(buf == NULL){ 233 mconsole_reply(req, "Failed to allocate buffer", 1, 0); 234 goto out_close; 235 } 236 237 for (;;) { 238 len = sys_read(fd, buf, PAGE_SIZE-1); 239 if (len < 0) { 240 mconsole_reply(req, "Read of file failed", 1, 0); 241 goto out_free; 242 } 243 /*Begin the file content on his own line.*/ 244 if (first_chunk) { 245 mconsole_reply(req, "\n", 0, 1); 246 first_chunk = 0; 247 } 248 if (len == PAGE_SIZE-1) { 249 buf[len] = '\0'; 250 mconsole_reply(req, buf, 0, 1); 251 } else { 252 buf[len] = '\0'; 253 mconsole_reply(req, buf, 0, 0); 254 break; 255 } 256 } 257 258 out_free: 259 kfree(buf); 260 out_close: 261 sys_close(fd); 262 out: 263 /* nothing */; 264 } 265 266 #define UML_MCONSOLE_HELPTEXT \ 267 "Commands: \n\ 268 version - Get kernel version \n\ 269 help - Print this message \n\ 270 halt - Halt UML \n\ 271 reboot - Reboot UML \n\ 272 config <dev>=<config> - Add a new device to UML; \n\ 273 same syntax as command line \n\ 274 config <dev> - Query the configuration of a device \n\ 275 remove <dev> - Remove a device from UML \n\ 276 sysrq <letter> - Performs the SysRq action controlled by the letter \n\ 277 cad - invoke the Ctrl-Alt-Del handler \n\ 278 stop - pause the UML; it will do nothing until it receives a 'go' \n\ 279 go - continue the UML after a 'stop' \n\ 280 log <string> - make UML enter <string> into the kernel log\n\ 281 proc <file> - returns the contents of the UML's /proc/<file>\n\ 282 stack <pid> - returns the stack of the specified pid\n\ 283 " 284 285 void mconsole_help(struct mc_request *req) 286 { 287 mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0); 288 } 289 290 void mconsole_halt(struct mc_request *req) 291 { 292 mconsole_reply(req, "", 0, 0); 293 machine_halt(); 294 } 295 296 void mconsole_reboot(struct mc_request *req) 297 { 298 mconsole_reply(req, "", 0, 0); 299 machine_restart(NULL); 300 } 301 302 void mconsole_cad(struct mc_request *req) 303 { 304 mconsole_reply(req, "", 0, 0); 305 ctrl_alt_del(); 306 } 307 308 void mconsole_go(struct mc_request *req) 309 { 310 mconsole_reply(req, "Not stopped", 1, 0); 311 } 312 313 void mconsole_stop(struct mc_request *req) 314 { 315 deactivate_fd(req->originating_fd, MCONSOLE_IRQ); 316 os_set_fd_block(req->originating_fd, 1); 317 mconsole_reply(req, "stopped", 0, 0); 318 while (mconsole_get_request(req->originating_fd, req)) { 319 if (req->cmd->handler == mconsole_go) 320 break; 321 if (req->cmd->handler == mconsole_stop) { 322 mconsole_reply(req, "Already stopped", 1, 0); 323 continue; 324 } 325 if (req->cmd->handler == mconsole_sysrq) { 326 struct pt_regs *old_regs; 327 old_regs = set_irq_regs((struct pt_regs *)&req->regs); 328 mconsole_sysrq(req); 329 set_irq_regs(old_regs); 330 continue; 331 } 332 (*req->cmd->handler)(req); 333 } 334 os_set_fd_block(req->originating_fd, 0); 335 reactivate_fd(req->originating_fd, MCONSOLE_IRQ); 336 mconsole_reply(req, "", 0, 0); 337 } 338 339 static DEFINE_SPINLOCK(mc_devices_lock); 340 static LIST_HEAD(mconsole_devices); 341 342 void mconsole_register_dev(struct mc_device *new) 343 { 344 spin_lock(&mc_devices_lock); 345 BUG_ON(!list_empty(&new->list)); 346 list_add(&new->list, &mconsole_devices); 347 spin_unlock(&mc_devices_lock); 348 } 349 350 static struct mc_device *mconsole_find_dev(char *name) 351 { 352 struct list_head *ele; 353 struct mc_device *dev; 354 355 list_for_each(ele, &mconsole_devices){ 356 dev = list_entry(ele, struct mc_device, list); 357 if(!strncmp(name, dev->name, strlen(dev->name))) 358 return(dev); 359 } 360 return(NULL); 361 } 362 363 #define UNPLUGGED_PER_PAGE \ 364 ((PAGE_SIZE - sizeof(struct list_head)) / sizeof(unsigned long)) 365 366 struct unplugged_pages { 367 struct list_head list; 368 void *pages[UNPLUGGED_PER_PAGE]; 369 }; 370 371 static DECLARE_MUTEX(plug_mem_mutex); 372 static unsigned long long unplugged_pages_count = 0; 373 static LIST_HEAD(unplugged_pages); 374 static int unplug_index = UNPLUGGED_PER_PAGE; 375 376 static int mem_config(char *str, char **error_out) 377 { 378 unsigned long long diff; 379 int err = -EINVAL, i, add; 380 char *ret; 381 382 if(str[0] != '='){ 383 *error_out = "Expected '=' after 'mem'"; 384 goto out; 385 } 386 387 str++; 388 if(str[0] == '-') 389 add = 0; 390 else if(str[0] == '+'){ 391 add = 1; 392 } 393 else { 394 *error_out = "Expected increment to start with '-' or '+'"; 395 goto out; 396 } 397 398 str++; 399 diff = memparse(str, &ret); 400 if(*ret != '\0'){ 401 *error_out = "Failed to parse memory increment"; 402 goto out; 403 } 404 405 diff /= PAGE_SIZE; 406 407 down(&plug_mem_mutex); 408 for(i = 0; i < diff; i++){ 409 struct unplugged_pages *unplugged; 410 void *addr; 411 412 if(add){ 413 if(list_empty(&unplugged_pages)) 414 break; 415 416 unplugged = list_entry(unplugged_pages.next, 417 struct unplugged_pages, list); 418 if(unplug_index > 0) 419 addr = unplugged->pages[--unplug_index]; 420 else { 421 list_del(&unplugged->list); 422 addr = unplugged; 423 unplug_index = UNPLUGGED_PER_PAGE; 424 } 425 426 free_page((unsigned long) addr); 427 unplugged_pages_count--; 428 } 429 else { 430 struct page *page; 431 432 page = alloc_page(GFP_ATOMIC); 433 if(page == NULL) 434 break; 435 436 unplugged = page_address(page); 437 if(unplug_index == UNPLUGGED_PER_PAGE){ 438 list_add(&unplugged->list, &unplugged_pages); 439 unplug_index = 0; 440 } 441 else { 442 struct list_head *entry = unplugged_pages.next; 443 addr = unplugged; 444 445 unplugged = list_entry(entry, 446 struct unplugged_pages, 447 list); 448 err = os_drop_memory(addr, PAGE_SIZE); 449 if(err){ 450 printk("Failed to release memory - " 451 "errno = %d\n", err); 452 *error_out = "Failed to release memory"; 453 goto out_unlock; 454 } 455 unplugged->pages[unplug_index++] = addr; 456 } 457 458 unplugged_pages_count++; 459 } 460 } 461 462 err = 0; 463 out_unlock: 464 up(&plug_mem_mutex); 465 out: 466 return err; 467 } 468 469 static int mem_get_config(char *name, char *str, int size, char **error_out) 470 { 471 char buf[sizeof("18446744073709551615")]; 472 int len = 0; 473 474 sprintf(buf, "%ld", uml_physmem); 475 CONFIG_CHUNK(str, size, len, buf, 1); 476 477 return len; 478 } 479 480 static int mem_id(char **str, int *start_out, int *end_out) 481 { 482 *start_out = 0; 483 *end_out = 0; 484 485 return 0; 486 } 487 488 static int mem_remove(int n, char **error_out) 489 { 490 *error_out = "Memory doesn't support the remove operation"; 491 return -EBUSY; 492 } 493 494 static struct mc_device mem_mc = { 495 .list = LIST_HEAD_INIT(mem_mc.list), 496 .name = "mem", 497 .config = mem_config, 498 .get_config = mem_get_config, 499 .id = mem_id, 500 .remove = mem_remove, 501 }; 502 503 static int mem_mc_init(void) 504 { 505 if(can_drop_memory()) 506 mconsole_register_dev(&mem_mc); 507 else printk("Can't release memory to the host - memory hotplug won't " 508 "be supported\n"); 509 return 0; 510 } 511 512 __initcall(mem_mc_init); 513 514 #define CONFIG_BUF_SIZE 64 515 516 static void mconsole_get_config(int (*get_config)(char *, char *, int, 517 char **), 518 struct mc_request *req, char *name) 519 { 520 char default_buf[CONFIG_BUF_SIZE], *error, *buf; 521 int n, size; 522 523 if(get_config == NULL){ 524 mconsole_reply(req, "No get_config routine defined", 1, 0); 525 return; 526 } 527 528 error = NULL; 529 size = ARRAY_SIZE(default_buf); 530 buf = default_buf; 531 532 while(1){ 533 n = (*get_config)(name, buf, size, &error); 534 if(error != NULL){ 535 mconsole_reply(req, error, 1, 0); 536 goto out; 537 } 538 539 if(n <= size){ 540 mconsole_reply(req, buf, 0, 0); 541 goto out; 542 } 543 544 if(buf != default_buf) 545 kfree(buf); 546 547 size = n; 548 buf = kmalloc(size, GFP_KERNEL); 549 if(buf == NULL){ 550 mconsole_reply(req, "Failed to allocate buffer", 1, 0); 551 return; 552 } 553 } 554 out: 555 if(buf != default_buf) 556 kfree(buf); 557 } 558 559 void mconsole_config(struct mc_request *req) 560 { 561 struct mc_device *dev; 562 char *ptr = req->request.data, *name, *error_string = ""; 563 int err; 564 565 ptr += strlen("config"); 566 while(isspace(*ptr)) ptr++; 567 dev = mconsole_find_dev(ptr); 568 if(dev == NULL){ 569 mconsole_reply(req, "Bad configuration option", 1, 0); 570 return; 571 } 572 573 name = &ptr[strlen(dev->name)]; 574 ptr = name; 575 while((*ptr != '=') && (*ptr != '\0')) 576 ptr++; 577 578 if(*ptr == '='){ 579 err = (*dev->config)(name, &error_string); 580 mconsole_reply(req, error_string, err, 0); 581 } 582 else mconsole_get_config(dev->get_config, req, name); 583 } 584 585 void mconsole_remove(struct mc_request *req) 586 { 587 struct mc_device *dev; 588 char *ptr = req->request.data, *err_msg = ""; 589 char error[256]; 590 int err, start, end, n; 591 592 ptr += strlen("remove"); 593 while(isspace(*ptr)) ptr++; 594 dev = mconsole_find_dev(ptr); 595 if(dev == NULL){ 596 mconsole_reply(req, "Bad remove option", 1, 0); 597 return; 598 } 599 600 ptr = &ptr[strlen(dev->name)]; 601 602 err = 1; 603 n = (*dev->id)(&ptr, &start, &end); 604 if(n < 0){ 605 err_msg = "Couldn't parse device number"; 606 goto out; 607 } 608 else if((n < start) || (n > end)){ 609 sprintf(error, "Invalid device number - must be between " 610 "%d and %d", start, end); 611 err_msg = error; 612 goto out; 613 } 614 615 err_msg = NULL; 616 err = (*dev->remove)(n, &err_msg); 617 switch(err){ 618 case 0: 619 err_msg = ""; 620 break; 621 case -ENODEV: 622 if(err_msg == NULL) 623 err_msg = "Device doesn't exist"; 624 break; 625 case -EBUSY: 626 if(err_msg == NULL) 627 err_msg = "Device is currently open"; 628 break; 629 default: 630 break; 631 } 632 out: 633 mconsole_reply(req, err_msg, err, 0); 634 } 635 636 struct mconsole_output { 637 struct list_head list; 638 struct mc_request *req; 639 }; 640 641 static DEFINE_SPINLOCK(client_lock); 642 static LIST_HEAD(clients); 643 static char console_buf[MCONSOLE_MAX_DATA]; 644 static int console_index = 0; 645 646 static void console_write(struct console *console, const char *string, 647 unsigned len) 648 { 649 struct list_head *ele; 650 int n; 651 652 if(list_empty(&clients)) 653 return; 654 655 while(1){ 656 n = min((size_t) len, ARRAY_SIZE(console_buf) - console_index); 657 strncpy(&console_buf[console_index], string, n); 658 console_index += n; 659 string += n; 660 len -= n; 661 if(len == 0) 662 return; 663 664 list_for_each(ele, &clients){ 665 struct mconsole_output *entry; 666 667 entry = list_entry(ele, struct mconsole_output, list); 668 mconsole_reply_len(entry->req, console_buf, 669 console_index, 0, 1); 670 } 671 672 console_index = 0; 673 } 674 } 675 676 static struct console mc_console = { .name = "mc", 677 .write = console_write, 678 .flags = CON_ENABLED, 679 .index = -1 }; 680 681 static int mc_add_console(void) 682 { 683 register_console(&mc_console); 684 return 0; 685 } 686 687 late_initcall(mc_add_console); 688 689 static void with_console(struct mc_request *req, void (*proc)(void *), 690 void *arg) 691 { 692 struct mconsole_output entry; 693 unsigned long flags; 694 695 entry.req = req; 696 spin_lock_irqsave(&client_lock, flags); 697 list_add(&entry.list, &clients); 698 spin_unlock_irqrestore(&client_lock, flags); 699 700 (*proc)(arg); 701 702 mconsole_reply_len(req, console_buf, console_index, 0, 0); 703 console_index = 0; 704 705 spin_lock_irqsave(&client_lock, flags); 706 list_del(&entry.list); 707 spin_unlock_irqrestore(&client_lock, flags); 708 } 709 710 #ifdef CONFIG_MAGIC_SYSRQ 711 static void sysrq_proc(void *arg) 712 { 713 char *op = arg; 714 handle_sysrq(*op, NULL); 715 } 716 717 void mconsole_sysrq(struct mc_request *req) 718 { 719 char *ptr = req->request.data; 720 721 ptr += strlen("sysrq"); 722 while(isspace(*ptr)) ptr++; 723 724 /* With 'b', the system will shut down without a chance to reply, 725 * so in this case, we reply first. 726 */ 727 if(*ptr == 'b') 728 mconsole_reply(req, "", 0, 0); 729 730 with_console(req, sysrq_proc, ptr); 731 } 732 #else 733 void mconsole_sysrq(struct mc_request *req) 734 { 735 mconsole_reply(req, "Sysrq not compiled in", 1, 0); 736 } 737 #endif 738 739 #ifdef CONFIG_MODE_SKAS 740 741 static void stack_proc(void *arg) 742 { 743 struct task_struct *from = current, *to = arg; 744 745 to->thread.saved_task = from; 746 switch_to(from, to, from); 747 } 748 749 /* Mconsole stack trace 750 * Added by Allan Graves, Jeff Dike 751 * Dumps a stacks registers to the linux console. 752 * Usage stack <pid>. 753 */ 754 static void do_stack_trace(struct mc_request *req) 755 { 756 char *ptr = req->request.data; 757 int pid_requested= -1; 758 struct task_struct *from = NULL; 759 struct task_struct *to = NULL; 760 761 /* Would be nice: 762 * 1) Send showregs output to mconsole. 763 * 2) Add a way to stack dump all pids. 764 */ 765 766 ptr += strlen("stack"); 767 while(isspace(*ptr)) ptr++; 768 769 /* Should really check for multiple pids or reject bad args here */ 770 /* What do the arguments in mconsole_reply mean? */ 771 if(sscanf(ptr, "%d", &pid_requested) == 0){ 772 mconsole_reply(req, "Please specify a pid", 1, 0); 773 return; 774 } 775 776 from = current; 777 778 to = find_task_by_pid(pid_requested); 779 if((to == NULL) || (pid_requested == 0)) { 780 mconsole_reply(req, "Couldn't find that pid", 1, 0); 781 return; 782 } 783 with_console(req, stack_proc, to); 784 } 785 #endif /* CONFIG_MODE_SKAS */ 786 787 void mconsole_stack(struct mc_request *req) 788 { 789 /* This command doesn't work in TT mode, so let's check and then 790 * get out of here 791 */ 792 CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", 793 1, 0), 794 do_stack_trace(req)); 795 } 796 797 /* Changed by mconsole_setup, which is __setup, and called before SMP is 798 * active. 799 */ 800 static char *notify_socket = NULL; 801 802 static int mconsole_init(void) 803 { 804 /* long to avoid size mismatch warnings from gcc */ 805 long sock; 806 int err; 807 char file[256]; 808 809 if(umid_file_name("mconsole", file, sizeof(file))) return(-1); 810 snprintf(mconsole_socket_name, sizeof(file), "%s", file); 811 812 sock = os_create_unix_socket(file, sizeof(file), 1); 813 if (sock < 0){ 814 printk("Failed to initialize management console\n"); 815 return(1); 816 } 817 818 register_reboot_notifier(&reboot_notifier); 819 820 err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt, 821 IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM, 822 "mconsole", (void *)sock); 823 if (err){ 824 printk("Failed to get IRQ for management console\n"); 825 return(1); 826 } 827 828 if(notify_socket != NULL){ 829 notify_socket = kstrdup(notify_socket, GFP_KERNEL); 830 if(notify_socket != NULL) 831 mconsole_notify(notify_socket, MCONSOLE_SOCKET, 832 mconsole_socket_name, 833 strlen(mconsole_socket_name) + 1); 834 else printk(KERN_ERR "mconsole_setup failed to strdup " 835 "string\n"); 836 } 837 838 printk("mconsole (version %d) initialized on %s\n", 839 MCONSOLE_VERSION, mconsole_socket_name); 840 return(0); 841 } 842 843 __initcall(mconsole_init); 844 845 static int write_proc_mconsole(struct file *file, const char __user *buffer, 846 unsigned long count, void *data) 847 { 848 char *buf; 849 850 buf = kmalloc(count + 1, GFP_KERNEL); 851 if(buf == NULL) 852 return(-ENOMEM); 853 854 if(copy_from_user(buf, buffer, count)){ 855 count = -EFAULT; 856 goto out; 857 } 858 859 buf[count] = '\0'; 860 861 mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count); 862 out: 863 kfree(buf); 864 return(count); 865 } 866 867 static int create_proc_mconsole(void) 868 { 869 struct proc_dir_entry *ent; 870 871 if(notify_socket == NULL) return(0); 872 873 ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL); 874 if(ent == NULL){ 875 printk(KERN_INFO "create_proc_mconsole : create_proc_entry failed\n"); 876 return(0); 877 } 878 879 ent->read_proc = NULL; 880 ent->write_proc = write_proc_mconsole; 881 return(0); 882 } 883 884 static DEFINE_SPINLOCK(notify_spinlock); 885 886 void lock_notify(void) 887 { 888 spin_lock(¬ify_spinlock); 889 } 890 891 void unlock_notify(void) 892 { 893 spin_unlock(¬ify_spinlock); 894 } 895 896 __initcall(create_proc_mconsole); 897 898 #define NOTIFY "=notify:" 899 900 static int mconsole_setup(char *str) 901 { 902 if(!strncmp(str, NOTIFY, strlen(NOTIFY))){ 903 str += strlen(NOTIFY); 904 notify_socket = str; 905 } 906 else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str); 907 return(1); 908 } 909 910 __setup("mconsole", mconsole_setup); 911 912 __uml_help(mconsole_setup, 913 "mconsole=notify:<socket>\n" 914 " Requests that the mconsole driver send a message to the named Unix\n" 915 " socket containing the name of the mconsole socket. This also serves\n" 916 " to notify outside processes when UML has booted far enough to respond\n" 917 " to mconsole requests.\n\n" 918 ); 919 920 static int notify_panic(struct notifier_block *self, unsigned long unused1, 921 void *ptr) 922 { 923 char *message = ptr; 924 925 if(notify_socket == NULL) return(0); 926 927 mconsole_notify(notify_socket, MCONSOLE_PANIC, message, 928 strlen(message) + 1); 929 return(0); 930 } 931 932 static struct notifier_block panic_exit_notifier = { 933 .notifier_call = notify_panic, 934 .next = NULL, 935 .priority = 1 936 }; 937 938 static int add_notifier(void) 939 { 940 atomic_notifier_chain_register(&panic_notifier_list, 941 &panic_exit_notifier); 942 return(0); 943 } 944 945 __initcall(add_notifier); 946 947 char *mconsole_notify_socket(void) 948 { 949 return(notify_socket); 950 } 951 952 EXPORT_SYMBOL(mconsole_notify_socket); 953