1 #include <linux/module.h> 2 #include <linux/reboot.h> 3 #include <linux/init.h> 4 #include <linux/pm.h> 5 #include <linux/efi.h> 6 #include <linux/dmi.h> 7 #include <linux/sched.h> 8 #include <linux/tboot.h> 9 #include <linux/delay.h> 10 #include <acpi/reboot.h> 11 #include <asm/io.h> 12 #include <asm/apic.h> 13 #include <asm/desc.h> 14 #include <asm/hpet.h> 15 #include <asm/pgtable.h> 16 #include <asm/proto.h> 17 #include <asm/reboot_fixups.h> 18 #include <asm/reboot.h> 19 #include <asm/pci_x86.h> 20 #include <asm/virtext.h> 21 #include <asm/cpu.h> 22 #include <asm/nmi.h> 23 24 #ifdef CONFIG_X86_32 25 # include <linux/ctype.h> 26 # include <linux/mc146818rtc.h> 27 #else 28 # include <asm/x86_init.h> 29 #endif 30 31 /* 32 * Power off function, if any 33 */ 34 void (*pm_power_off)(void); 35 EXPORT_SYMBOL(pm_power_off); 36 37 static const struct desc_ptr no_idt = {}; 38 static int reboot_mode; 39 enum reboot_type reboot_type = BOOT_ACPI; 40 int reboot_force; 41 42 /* 43 * This variable is used privately to keep track of whether or not 44 * reboot_type is still set to its default value (i.e., reboot= hasn't 45 * been set on the command line). This is needed so that we can 46 * suppress DMI scanning for reboot quirks. Without it, it's 47 * impossible to override a faulty reboot quirk without recompiling. 48 */ 49 static int reboot_default = 1; 50 51 #if defined(CONFIG_X86_32) && defined(CONFIG_SMP) 52 static int reboot_cpu = -1; 53 #endif 54 55 /* 56 * This is set if we need to go through the 'emergency' path. 57 * When machine_emergency_restart() is called, we may be on 58 * an inconsistent state and won't be able to do a clean cleanup 59 */ 60 static int reboot_emergency; 61 62 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ 63 bool port_cf9_safe = false; 64 65 /* 66 * reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci] 67 * warm Don't set the cold reboot flag 68 * cold Set the cold reboot flag 69 * bios Reboot by jumping through the BIOS (only for X86_32) 70 * smp Reboot by executing reset on BSP or other CPU (only for X86_32) 71 * triple Force a triple fault (init) 72 * kbd Use the keyboard controller. cold reset (default) 73 * acpi Use the RESET_REG in the FADT 74 * efi Use efi reset_system runtime service 75 * pci Use the so-called "PCI reset register", CF9 76 * force Avoid anything that could hang. 77 */ 78 static int __init reboot_setup(char *str) 79 { 80 for (;;) { 81 /* 82 * Having anything passed on the command line via 83 * reboot= will cause us to disable DMI checking 84 * below. 85 */ 86 reboot_default = 0; 87 88 switch (*str) { 89 case 'w': 90 reboot_mode = 0x1234; 91 break; 92 93 case 'c': 94 reboot_mode = 0; 95 break; 96 97 #ifdef CONFIG_X86_32 98 #ifdef CONFIG_SMP 99 case 's': 100 if (isdigit(*(str+1))) { 101 reboot_cpu = (int) (*(str+1) - '0'); 102 if (isdigit(*(str+2))) 103 reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); 104 } 105 /* 106 * We will leave sorting out the final value 107 * when we are ready to reboot, since we might not 108 * have detected BSP APIC ID or smp_num_cpu 109 */ 110 break; 111 #endif /* CONFIG_SMP */ 112 113 case 'b': 114 #endif 115 case 'a': 116 case 'k': 117 case 't': 118 case 'e': 119 case 'p': 120 reboot_type = *str; 121 break; 122 123 case 'f': 124 reboot_force = 1; 125 break; 126 } 127 128 str = strchr(str, ','); 129 if (str) 130 str++; 131 else 132 break; 133 } 134 return 1; 135 } 136 137 __setup("reboot=", reboot_setup); 138 139 140 #ifdef CONFIG_X86_32 141 /* 142 * Reboot options and system auto-detection code provided by 143 * Dell Inc. so their systems "just work". :-) 144 */ 145 146 /* 147 * Some machines require the "reboot=b" or "reboot=k" commandline options, 148 * this quirk makes that automatic. 149 */ 150 static int __init set_bios_reboot(const struct dmi_system_id *d) 151 { 152 if (reboot_type != BOOT_BIOS) { 153 reboot_type = BOOT_BIOS; 154 printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident); 155 } 156 return 0; 157 } 158 159 extern const unsigned char machine_real_restart_asm[]; 160 extern const u64 machine_real_restart_gdt[3]; 161 162 void machine_real_restart(unsigned int type) 163 { 164 void *restart_va; 165 unsigned long restart_pa; 166 void (*restart_lowmem)(unsigned int); 167 u64 *lowmem_gdt; 168 169 local_irq_disable(); 170 171 /* 172 * Write zero to CMOS register number 0x0f, which the BIOS POST 173 * routine will recognize as telling it to do a proper reboot. (Well 174 * that's what this book in front of me says -- it may only apply to 175 * the Phoenix BIOS though, it's not clear). At the same time, 176 * disable NMIs by setting the top bit in the CMOS address register, 177 * as we're about to do peculiar things to the CPU. I'm not sure if 178 * `outb_p' is needed instead of just `outb'. Use it to be on the 179 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) 180 */ 181 spin_lock(&rtc_lock); 182 CMOS_WRITE(0x00, 0x8f); 183 spin_unlock(&rtc_lock); 184 185 /* 186 * Switch back to the initial page table. 187 */ 188 load_cr3(initial_page_table); 189 190 /* 191 * Write 0x1234 to absolute memory location 0x472. The BIOS reads 192 * this on booting to tell it to "Bypass memory test (also warm 193 * boot)". This seems like a fairly standard thing that gets set by 194 * REBOOT.COM programs, and the previous reset routine did this 195 * too. */ 196 *((unsigned short *)0x472) = reboot_mode; 197 198 /* Patch the GDT in the low memory trampoline */ 199 lowmem_gdt = TRAMPOLINE_SYM(machine_real_restart_gdt); 200 201 restart_va = TRAMPOLINE_SYM(machine_real_restart_asm); 202 restart_pa = virt_to_phys(restart_va); 203 restart_lowmem = (void (*)(unsigned int))restart_pa; 204 205 /* GDT[0]: GDT self-pointer */ 206 lowmem_gdt[0] = 207 (u64)(sizeof(machine_real_restart_gdt) - 1) + 208 ((u64)virt_to_phys(lowmem_gdt) << 16); 209 /* GDT[1]: 64K real mode code segment */ 210 lowmem_gdt[1] = 211 GDT_ENTRY(0x009b, restart_pa, 0xffff); 212 213 /* Jump to the identity-mapped low memory code */ 214 restart_lowmem(type); 215 } 216 #ifdef CONFIG_APM_MODULE 217 EXPORT_SYMBOL(machine_real_restart); 218 #endif 219 220 #endif /* CONFIG_X86_32 */ 221 222 /* 223 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot 224 */ 225 static int __init set_pci_reboot(const struct dmi_system_id *d) 226 { 227 if (reboot_type != BOOT_CF9) { 228 reboot_type = BOOT_CF9; 229 printk(KERN_INFO "%s series board detected. " 230 "Selecting PCI-method for reboots.\n", d->ident); 231 } 232 return 0; 233 } 234 235 static int __init set_kbd_reboot(const struct dmi_system_id *d) 236 { 237 if (reboot_type != BOOT_KBD) { 238 reboot_type = BOOT_KBD; 239 printk(KERN_INFO "%s series board detected. Selecting KBD-method for reboot.\n", d->ident); 240 } 241 return 0; 242 } 243 244 /* 245 * This is a single dmi_table handling all reboot quirks. Note that 246 * REBOOT_BIOS is only available for 32bit 247 */ 248 static struct dmi_system_id __initdata reboot_dmi_table[] = { 249 #ifdef CONFIG_X86_32 250 { /* Handle problems with rebooting on Dell E520's */ 251 .callback = set_bios_reboot, 252 .ident = "Dell E520", 253 .matches = { 254 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 255 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), 256 }, 257 }, 258 { /* Handle problems with rebooting on Dell 1300's */ 259 .callback = set_bios_reboot, 260 .ident = "Dell PowerEdge 1300", 261 .matches = { 262 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 263 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), 264 }, 265 }, 266 { /* Handle problems with rebooting on Dell 300's */ 267 .callback = set_bios_reboot, 268 .ident = "Dell PowerEdge 300", 269 .matches = { 270 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 271 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), 272 }, 273 }, 274 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ 275 .callback = set_bios_reboot, 276 .ident = "Dell OptiPlex 745", 277 .matches = { 278 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 279 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), 280 }, 281 }, 282 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ 283 .callback = set_bios_reboot, 284 .ident = "Dell OptiPlex 745", 285 .matches = { 286 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 287 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), 288 DMI_MATCH(DMI_BOARD_NAME, "0MM599"), 289 }, 290 }, 291 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ 292 .callback = set_bios_reboot, 293 .ident = "Dell OptiPlex 745", 294 .matches = { 295 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 296 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), 297 DMI_MATCH(DMI_BOARD_NAME, "0KW626"), 298 }, 299 }, 300 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ 301 .callback = set_bios_reboot, 302 .ident = "Dell OptiPlex 330", 303 .matches = { 304 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 305 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), 306 DMI_MATCH(DMI_BOARD_NAME, "0KP561"), 307 }, 308 }, 309 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ 310 .callback = set_bios_reboot, 311 .ident = "Dell OptiPlex 360", 312 .matches = { 313 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 314 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), 315 DMI_MATCH(DMI_BOARD_NAME, "0T656F"), 316 }, 317 }, 318 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ 319 .callback = set_bios_reboot, 320 .ident = "Dell OptiPlex 760", 321 .matches = { 322 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 323 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), 324 DMI_MATCH(DMI_BOARD_NAME, "0G919G"), 325 }, 326 }, 327 { /* Handle problems with rebooting on Dell 2400's */ 328 .callback = set_bios_reboot, 329 .ident = "Dell PowerEdge 2400", 330 .matches = { 331 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), 332 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), 333 }, 334 }, 335 { /* Handle problems with rebooting on Dell T5400's */ 336 .callback = set_bios_reboot, 337 .ident = "Dell Precision T5400", 338 .matches = { 339 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 340 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), 341 }, 342 }, 343 { /* Handle problems with rebooting on Dell T7400's */ 344 .callback = set_bios_reboot, 345 .ident = "Dell Precision T7400", 346 .matches = { 347 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 348 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), 349 }, 350 }, 351 { /* Handle problems with rebooting on HP laptops */ 352 .callback = set_bios_reboot, 353 .ident = "HP Compaq Laptop", 354 .matches = { 355 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 356 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), 357 }, 358 }, 359 { /* Handle problems with rebooting on Dell XPS710 */ 360 .callback = set_bios_reboot, 361 .ident = "Dell XPS710", 362 .matches = { 363 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 364 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), 365 }, 366 }, 367 { /* Handle problems with rebooting on Dell DXP061 */ 368 .callback = set_bios_reboot, 369 .ident = "Dell DXP061", 370 .matches = { 371 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 372 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), 373 }, 374 }, 375 { /* Handle problems with rebooting on Sony VGN-Z540N */ 376 .callback = set_bios_reboot, 377 .ident = "Sony VGN-Z540N", 378 .matches = { 379 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 380 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), 381 }, 382 }, 383 { /* Handle problems with rebooting on CompuLab SBC-FITPC2 */ 384 .callback = set_bios_reboot, 385 .ident = "CompuLab SBC-FITPC2", 386 .matches = { 387 DMI_MATCH(DMI_SYS_VENDOR, "CompuLab"), 388 DMI_MATCH(DMI_PRODUCT_NAME, "SBC-FITPC2"), 389 }, 390 }, 391 { /* Handle problems with rebooting on ASUS P4S800 */ 392 .callback = set_bios_reboot, 393 .ident = "ASUS P4S800", 394 .matches = { 395 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 396 DMI_MATCH(DMI_BOARD_NAME, "P4S800"), 397 }, 398 }, 399 #endif /* CONFIG_X86_32 */ 400 401 { /* Handle reboot issue on Acer Aspire one */ 402 .callback = set_kbd_reboot, 403 .ident = "Acer Aspire One A110", 404 .matches = { 405 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 406 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), 407 }, 408 }, 409 { /* Handle problems with rebooting on Apple MacBook5 */ 410 .callback = set_pci_reboot, 411 .ident = "Apple MacBook5", 412 .matches = { 413 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 414 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), 415 }, 416 }, 417 { /* Handle problems with rebooting on Apple MacBookPro5 */ 418 .callback = set_pci_reboot, 419 .ident = "Apple MacBookPro5", 420 .matches = { 421 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 422 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), 423 }, 424 }, 425 { /* Handle problems with rebooting on Apple Macmini3,1 */ 426 .callback = set_pci_reboot, 427 .ident = "Apple Macmini3,1", 428 .matches = { 429 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 430 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), 431 }, 432 }, 433 { /* Handle problems with rebooting on the iMac9,1. */ 434 .callback = set_pci_reboot, 435 .ident = "Apple iMac9,1", 436 .matches = { 437 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 438 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), 439 }, 440 }, 441 { /* Handle problems with rebooting on the Latitude E6320. */ 442 .callback = set_pci_reboot, 443 .ident = "Dell Latitude E6320", 444 .matches = { 445 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 446 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), 447 }, 448 }, 449 { /* Handle problems with rebooting on the Latitude E5420. */ 450 .callback = set_pci_reboot, 451 .ident = "Dell Latitude E5420", 452 .matches = { 453 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 454 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), 455 }, 456 }, 457 { /* Handle problems with rebooting on the Latitude E6420. */ 458 .callback = set_pci_reboot, 459 .ident = "Dell Latitude E6420", 460 .matches = { 461 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 462 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), 463 }, 464 }, 465 { /* Handle problems with rebooting on the OptiPlex 990. */ 466 .callback = set_pci_reboot, 467 .ident = "Dell OptiPlex 990", 468 .matches = { 469 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 470 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), 471 }, 472 }, 473 { } 474 }; 475 476 static int __init reboot_init(void) 477 { 478 /* 479 * Only do the DMI check if reboot_type hasn't been overridden 480 * on the command line 481 */ 482 if (reboot_default) 483 dmi_check_system(reboot_dmi_table); 484 return 0; 485 } 486 core_initcall(reboot_init); 487 488 static inline void kb_wait(void) 489 { 490 int i; 491 492 for (i = 0; i < 0x10000; i++) { 493 if ((inb(0x64) & 0x02) == 0) 494 break; 495 udelay(2); 496 } 497 } 498 499 static void vmxoff_nmi(int cpu, struct pt_regs *regs) 500 { 501 cpu_emergency_vmxoff(); 502 } 503 504 /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ 505 static void emergency_vmx_disable_all(void) 506 { 507 /* Just make sure we won't change CPUs while doing this */ 508 local_irq_disable(); 509 510 /* 511 * We need to disable VMX on all CPUs before rebooting, otherwise 512 * we risk hanging up the machine, because the CPU ignore INIT 513 * signals when VMX is enabled. 514 * 515 * We can't take any locks and we may be on an inconsistent 516 * state, so we use NMIs as IPIs to tell the other CPUs to disable 517 * VMX and halt. 518 * 519 * For safety, we will avoid running the nmi_shootdown_cpus() 520 * stuff unnecessarily, but we don't have a way to check 521 * if other CPUs have VMX enabled. So we will call it only if the 522 * CPU we are running on has VMX enabled. 523 * 524 * We will miss cases where VMX is not enabled on all CPUs. This 525 * shouldn't do much harm because KVM always enable VMX on all 526 * CPUs anyway. But we can miss it on the small window where KVM 527 * is still enabling VMX. 528 */ 529 if (cpu_has_vmx() && cpu_vmx_enabled()) { 530 /* Disable VMX on this CPU. */ 531 cpu_vmxoff(); 532 533 /* Halt and disable VMX on the other CPUs */ 534 nmi_shootdown_cpus(vmxoff_nmi); 535 536 } 537 } 538 539 540 void __attribute__((weak)) mach_reboot_fixups(void) 541 { 542 } 543 544 /* 545 * Windows compatible x86 hardware expects the following on reboot: 546 * 547 * 1) If the FADT has the ACPI reboot register flag set, try it 548 * 2) If still alive, write to the keyboard controller 549 * 3) If still alive, write to the ACPI reboot register again 550 * 4) If still alive, write to the keyboard controller again 551 * 552 * If the machine is still alive at this stage, it gives up. We default to 553 * following the same pattern, except that if we're still alive after (4) we'll 554 * try to force a triple fault and then cycle between hitting the keyboard 555 * controller and doing that 556 */ 557 static void native_machine_emergency_restart(void) 558 { 559 int i; 560 int attempt = 0; 561 int orig_reboot_type = reboot_type; 562 563 if (reboot_emergency) 564 emergency_vmx_disable_all(); 565 566 tboot_shutdown(TB_SHUTDOWN_REBOOT); 567 568 /* Tell the BIOS if we want cold or warm reboot */ 569 *((unsigned short *)__va(0x472)) = reboot_mode; 570 571 for (;;) { 572 /* Could also try the reset bit in the Hammer NB */ 573 switch (reboot_type) { 574 case BOOT_KBD: 575 mach_reboot_fixups(); /* For board specific fixups */ 576 577 for (i = 0; i < 10; i++) { 578 kb_wait(); 579 udelay(50); 580 outb(0xfe, 0x64); /* Pulse reset low */ 581 udelay(50); 582 } 583 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { 584 attempt = 1; 585 reboot_type = BOOT_ACPI; 586 } else { 587 reboot_type = BOOT_TRIPLE; 588 } 589 break; 590 591 case BOOT_TRIPLE: 592 load_idt(&no_idt); 593 __asm__ __volatile__("int3"); 594 595 reboot_type = BOOT_KBD; 596 break; 597 598 #ifdef CONFIG_X86_32 599 case BOOT_BIOS: 600 machine_real_restart(MRR_BIOS); 601 602 reboot_type = BOOT_KBD; 603 break; 604 #endif 605 606 case BOOT_ACPI: 607 acpi_reboot(); 608 reboot_type = BOOT_KBD; 609 break; 610 611 case BOOT_EFI: 612 if (efi_enabled) 613 efi.reset_system(reboot_mode ? 614 EFI_RESET_WARM : 615 EFI_RESET_COLD, 616 EFI_SUCCESS, 0, NULL); 617 reboot_type = BOOT_KBD; 618 break; 619 620 case BOOT_CF9: 621 port_cf9_safe = true; 622 /* Fall through */ 623 624 case BOOT_CF9_COND: 625 if (port_cf9_safe) { 626 u8 cf9 = inb(0xcf9) & ~6; 627 outb(cf9|2, 0xcf9); /* Request hard reset */ 628 udelay(50); 629 outb(cf9|6, 0xcf9); /* Actually do the reset */ 630 udelay(50); 631 } 632 reboot_type = BOOT_KBD; 633 break; 634 } 635 } 636 } 637 638 void native_machine_shutdown(void) 639 { 640 /* Stop the cpus and apics */ 641 #ifdef CONFIG_SMP 642 643 /* The boot cpu is always logical cpu 0 */ 644 int reboot_cpu_id = 0; 645 646 #ifdef CONFIG_X86_32 647 /* See if there has been given a command line override */ 648 if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) && 649 cpu_online(reboot_cpu)) 650 reboot_cpu_id = reboot_cpu; 651 #endif 652 653 /* Make certain the cpu I'm about to reboot on is online */ 654 if (!cpu_online(reboot_cpu_id)) 655 reboot_cpu_id = smp_processor_id(); 656 657 /* Make certain I only run on the appropriate processor */ 658 set_cpus_allowed_ptr(current, cpumask_of(reboot_cpu_id)); 659 660 /* 661 * O.K Now that I'm on the appropriate processor, 662 * stop all of the others. 663 */ 664 stop_other_cpus(); 665 #endif 666 667 lapic_shutdown(); 668 669 #ifdef CONFIG_X86_IO_APIC 670 disable_IO_APIC(); 671 #endif 672 673 #ifdef CONFIG_HPET_TIMER 674 hpet_disable(); 675 #endif 676 677 #ifdef CONFIG_X86_64 678 x86_platform.iommu_shutdown(); 679 #endif 680 } 681 682 static void __machine_emergency_restart(int emergency) 683 { 684 reboot_emergency = emergency; 685 machine_ops.emergency_restart(); 686 } 687 688 static void native_machine_restart(char *__unused) 689 { 690 printk("machine restart\n"); 691 692 if (!reboot_force) 693 machine_shutdown(); 694 __machine_emergency_restart(0); 695 } 696 697 static void native_machine_halt(void) 698 { 699 /* Stop other cpus and apics */ 700 machine_shutdown(); 701 702 tboot_shutdown(TB_SHUTDOWN_HALT); 703 704 stop_this_cpu(NULL); 705 } 706 707 static void native_machine_power_off(void) 708 { 709 if (pm_power_off) { 710 if (!reboot_force) 711 machine_shutdown(); 712 pm_power_off(); 713 } 714 /* A fallback in case there is no PM info available */ 715 tboot_shutdown(TB_SHUTDOWN_HALT); 716 } 717 718 struct machine_ops machine_ops = { 719 .power_off = native_machine_power_off, 720 .shutdown = native_machine_shutdown, 721 .emergency_restart = native_machine_emergency_restart, 722 .restart = native_machine_restart, 723 .halt = native_machine_halt, 724 #ifdef CONFIG_KEXEC 725 .crash_shutdown = native_machine_crash_shutdown, 726 #endif 727 }; 728 729 void machine_power_off(void) 730 { 731 machine_ops.power_off(); 732 } 733 734 void machine_shutdown(void) 735 { 736 machine_ops.shutdown(); 737 } 738 739 void machine_emergency_restart(void) 740 { 741 __machine_emergency_restart(1); 742 } 743 744 void machine_restart(char *cmd) 745 { 746 machine_ops.restart(cmd); 747 } 748 749 void machine_halt(void) 750 { 751 machine_ops.halt(); 752 } 753 754 #ifdef CONFIG_KEXEC 755 void machine_crash_shutdown(struct pt_regs *regs) 756 { 757 machine_ops.crash_shutdown(regs); 758 } 759 #endif 760 761 762 #if defined(CONFIG_SMP) 763 764 /* This keeps a track of which one is crashing cpu. */ 765 static int crashing_cpu; 766 static nmi_shootdown_cb shootdown_callback; 767 768 static atomic_t waiting_for_crash_ipi; 769 770 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) 771 { 772 int cpu; 773 774 cpu = raw_smp_processor_id(); 775 776 /* 777 * Don't do anything if this handler is invoked on crashing cpu. 778 * Otherwise, system will completely hang. Crashing cpu can get 779 * an NMI if system was initially booted with nmi_watchdog parameter. 780 */ 781 if (cpu == crashing_cpu) 782 return NMI_HANDLED; 783 local_irq_disable(); 784 785 shootdown_callback(cpu, regs); 786 787 atomic_dec(&waiting_for_crash_ipi); 788 /* Assume hlt works */ 789 halt(); 790 for (;;) 791 cpu_relax(); 792 793 return NMI_HANDLED; 794 } 795 796 static void smp_send_nmi_allbutself(void) 797 { 798 apic->send_IPI_allbutself(NMI_VECTOR); 799 } 800 801 /* 802 * Halt all other CPUs, calling the specified function on each of them 803 * 804 * This function can be used to halt all other CPUs on crash 805 * or emergency reboot time. The function passed as parameter 806 * will be called inside a NMI handler on all CPUs. 807 */ 808 void nmi_shootdown_cpus(nmi_shootdown_cb callback) 809 { 810 unsigned long msecs; 811 local_irq_disable(); 812 813 /* Make a note of crashing cpu. Will be used in NMI callback. */ 814 crashing_cpu = safe_smp_processor_id(); 815 816 shootdown_callback = callback; 817 818 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); 819 /* Would it be better to replace the trap vector here? */ 820 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, 821 NMI_FLAG_FIRST, "crash")) 822 return; /* Return what? */ 823 /* 824 * Ensure the new callback function is set before sending 825 * out the NMI 826 */ 827 wmb(); 828 829 smp_send_nmi_allbutself(); 830 831 msecs = 1000; /* Wait at most a second for the other cpus to stop */ 832 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { 833 mdelay(1); 834 msecs--; 835 } 836 837 /* Leave the nmi callback set */ 838 } 839 #else /* !CONFIG_SMP */ 840 void nmi_shootdown_cpus(nmi_shootdown_cb callback) 841 { 842 /* No other CPUs to shoot down */ 843 } 844 #endif 845