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1// SPDX-License-Identifier: GPL-2.0
2#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4#include <linux/export.h>
5#include <linux/reboot.h>
6#include <linux/init.h>
7#include <linux/pm.h>
8#include <linux/efi.h>
9#include <linux/dmi.h>
10#include <linux/sched.h>
11#include <linux/tboot.h>
12#include <linux/delay.h>
13#include <linux/frame.h>
14#include <acpi/reboot.h>
15#include <asm/io.h>
16#include <asm/apic.h>
17#include <asm/io_apic.h>
18#include <asm/desc.h>
19#include <asm/hpet.h>
20#include <asm/pgtable.h>
21#include <asm/proto.h>
22#include <asm/reboot_fixups.h>
23#include <asm/reboot.h>
24#include <asm/pci_x86.h>
25#include <asm/virtext.h>
26#include <asm/cpu.h>
27#include <asm/nmi.h>
28#include <asm/smp.h>
29
30#include <linux/ctype.h>
31#include <linux/mc146818rtc.h>
32#include <asm/realmode.h>
33#include <asm/x86_init.h>
34#include <asm/efi.h>
35
36/*
37 * Power off function, if any
38 */
39void (*pm_power_off)(void);
40EXPORT_SYMBOL(pm_power_off);
41
42/*
43 * This is set if we need to go through the 'emergency' path.
44 * When machine_emergency_restart() is called, we may be on
45 * an inconsistent state and won't be able to do a clean cleanup
46 */
47static int reboot_emergency;
48
49/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
50bool port_cf9_safe = false;
51
52/*
53 * Reboot options and system auto-detection code provided by
54 * Dell Inc. so their systems "just work". :-)
55 */
56
57/*
58 * Some machines require the "reboot=a" commandline options
59 */
60static int __init set_acpi_reboot(const struct dmi_system_id *d)
61{
62 if (reboot_type != BOOT_ACPI) {
63 reboot_type = BOOT_ACPI;
64 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
65 d->ident, "ACPI");
66 }
67 return 0;
68}
69
70/*
71 * Some machines require the "reboot=b" or "reboot=k" commandline options,
72 * this quirk makes that automatic.
73 */
74static int __init set_bios_reboot(const struct dmi_system_id *d)
75{
76 if (reboot_type != BOOT_BIOS) {
77 reboot_type = BOOT_BIOS;
78 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
79 d->ident, "BIOS");
80 }
81 return 0;
82}
83
84void __noreturn machine_real_restart(unsigned int type)
85{
86 local_irq_disable();
87
88 /*
89 * Write zero to CMOS register number 0x0f, which the BIOS POST
90 * routine will recognize as telling it to do a proper reboot. (Well
91 * that's what this book in front of me says -- it may only apply to
92 * the Phoenix BIOS though, it's not clear). At the same time,
93 * disable NMIs by setting the top bit in the CMOS address register,
94 * as we're about to do peculiar things to the CPU. I'm not sure if
95 * `outb_p' is needed instead of just `outb'. Use it to be on the
96 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
97 */
98 spin_lock(&rtc_lock);
99 CMOS_WRITE(0x00, 0x8f);
100 spin_unlock(&rtc_lock);
101
102 /*
103 * Switch back to the initial page table.
104 */
105#ifdef CONFIG_X86_32
106 load_cr3(initial_page_table);
107#else
108 write_cr3(real_mode_header->trampoline_pgd);
109
110 /* Exiting long mode will fail if CR4.PCIDE is set. */
111 if (static_cpu_has(X86_FEATURE_PCID))
112 cr4_clear_bits(X86_CR4_PCIDE);
113#endif
114
115 /* Jump to the identity-mapped low memory code */
116#ifdef CONFIG_X86_32
117 asm volatile("jmpl *%0" : :
118 "rm" (real_mode_header->machine_real_restart_asm),
119 "a" (type));
120#else
121 asm volatile("ljmpl *%0" : :
122 "m" (real_mode_header->machine_real_restart_asm),
123 "D" (type));
124#endif
125 unreachable();
126}
127#ifdef CONFIG_APM_MODULE
128EXPORT_SYMBOL(machine_real_restart);
129#endif
130STACK_FRAME_NON_STANDARD(machine_real_restart);
131
132/*
133 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
134 */
135static int __init set_pci_reboot(const struct dmi_system_id *d)
136{
137 if (reboot_type != BOOT_CF9_FORCE) {
138 reboot_type = BOOT_CF9_FORCE;
139 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
140 d->ident, "PCI");
141 }
142 return 0;
143}
144
145static int __init set_kbd_reboot(const struct dmi_system_id *d)
146{
147 if (reboot_type != BOOT_KBD) {
148 reboot_type = BOOT_KBD;
149 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
150 d->ident, "KBD");
151 }
152 return 0;
153}
154
155/*
156 * This is a single dmi_table handling all reboot quirks.
157 */
158static const struct dmi_system_id reboot_dmi_table[] __initconst = {
159
160 /* Acer */
161 { /* Handle reboot issue on Acer Aspire one */
162 .callback = set_kbd_reboot,
163 .ident = "Acer Aspire One A110",
164 .matches = {
165 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
166 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
167 },
168 },
169
170 /* Apple */
171 { /* Handle problems with rebooting on Apple MacBook5 */
172 .callback = set_pci_reboot,
173 .ident = "Apple MacBook5",
174 .matches = {
175 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
176 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
177 },
178 },
179 { /* Handle problems with rebooting on Apple MacBookPro5 */
180 .callback = set_pci_reboot,
181 .ident = "Apple MacBookPro5",
182 .matches = {
183 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
184 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
185 },
186 },
187 { /* Handle problems with rebooting on Apple Macmini3,1 */
188 .callback = set_pci_reboot,
189 .ident = "Apple Macmini3,1",
190 .matches = {
191 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
192 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
193 },
194 },
195 { /* Handle problems with rebooting on the iMac9,1. */
196 .callback = set_pci_reboot,
197 .ident = "Apple iMac9,1",
198 .matches = {
199 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
200 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
201 },
202 },
203 { /* Handle problems with rebooting on the iMac10,1. */
204 .callback = set_pci_reboot,
205 .ident = "Apple iMac10,1",
206 .matches = {
207 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
208 DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
209 },
210 },
211
212 /* ASRock */
213 { /* Handle problems with rebooting on ASRock Q1900DC-ITX */
214 .callback = set_pci_reboot,
215 .ident = "ASRock Q1900DC-ITX",
216 .matches = {
217 DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
218 DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
219 },
220 },
221
222 /* ASUS */
223 { /* Handle problems with rebooting on ASUS P4S800 */
224 .callback = set_bios_reboot,
225 .ident = "ASUS P4S800",
226 .matches = {
227 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
228 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
229 },
230 },
231 { /* Handle problems with rebooting on ASUS EeeBook X205TA */
232 .callback = set_acpi_reboot,
233 .ident = "ASUS EeeBook X205TA",
234 .matches = {
235 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
236 DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
237 },
238 },
239 { /* Handle problems with rebooting on ASUS EeeBook X205TAW */
240 .callback = set_acpi_reboot,
241 .ident = "ASUS EeeBook X205TAW",
242 .matches = {
243 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
244 DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
245 },
246 },
247
248 /* Certec */
249 { /* Handle problems with rebooting on Certec BPC600 */
250 .callback = set_pci_reboot,
251 .ident = "Certec BPC600",
252 .matches = {
253 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
254 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
255 },
256 },
257
258 /* Dell */
259 { /* Handle problems with rebooting on Dell DXP061 */
260 .callback = set_bios_reboot,
261 .ident = "Dell DXP061",
262 .matches = {
263 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
264 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
265 },
266 },
267 { /* Handle problems with rebooting on Dell E520's */
268 .callback = set_bios_reboot,
269 .ident = "Dell E520",
270 .matches = {
271 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
272 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
273 },
274 },
275 { /* Handle problems with rebooting on the Latitude E5410. */
276 .callback = set_pci_reboot,
277 .ident = "Dell Latitude E5410",
278 .matches = {
279 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
280 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
281 },
282 },
283 { /* Handle problems with rebooting on the Latitude E5420. */
284 .callback = set_pci_reboot,
285 .ident = "Dell Latitude E5420",
286 .matches = {
287 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
288 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
289 },
290 },
291 { /* Handle problems with rebooting on the Latitude E6320. */
292 .callback = set_pci_reboot,
293 .ident = "Dell Latitude E6320",
294 .matches = {
295 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
296 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
297 },
298 },
299 { /* Handle problems with rebooting on the Latitude E6420. */
300 .callback = set_pci_reboot,
301 .ident = "Dell Latitude E6420",
302 .matches = {
303 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
304 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
305 },
306 },
307 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
308 .callback = set_bios_reboot,
309 .ident = "Dell OptiPlex 330",
310 .matches = {
311 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
312 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
313 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
314 },
315 },
316 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
317 .callback = set_bios_reboot,
318 .ident = "Dell OptiPlex 360",
319 .matches = {
320 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
321 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
322 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
323 },
324 },
325 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
326 .callback = set_bios_reboot,
327 .ident = "Dell OptiPlex 745",
328 .matches = {
329 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
331 },
332 },
333 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
334 .callback = set_bios_reboot,
335 .ident = "Dell OptiPlex 745",
336 .matches = {
337 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
338 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
339 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
340 },
341 },
342 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
343 .callback = set_bios_reboot,
344 .ident = "Dell OptiPlex 745",
345 .matches = {
346 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
347 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
348 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
349 },
350 },
351 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
352 .callback = set_bios_reboot,
353 .ident = "Dell OptiPlex 760",
354 .matches = {
355 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
356 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
357 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
358 },
359 },
360 { /* Handle problems with rebooting on the OptiPlex 990. */
361 .callback = set_pci_reboot,
362 .ident = "Dell OptiPlex 990",
363 .matches = {
364 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
365 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
366 },
367 },
368 { /* Handle problems with rebooting on Dell 300's */
369 .callback = set_bios_reboot,
370 .ident = "Dell PowerEdge 300",
371 .matches = {
372 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
373 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
374 },
375 },
376 { /* Handle problems with rebooting on Dell 1300's */
377 .callback = set_bios_reboot,
378 .ident = "Dell PowerEdge 1300",
379 .matches = {
380 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
381 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
382 },
383 },
384 { /* Handle problems with rebooting on Dell 2400's */
385 .callback = set_bios_reboot,
386 .ident = "Dell PowerEdge 2400",
387 .matches = {
388 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
389 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
390 },
391 },
392 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
393 .callback = set_pci_reboot,
394 .ident = "Dell PowerEdge C6100",
395 .matches = {
396 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
397 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
398 },
399 },
400 { /* Handle problems with rebooting on the Precision M6600. */
401 .callback = set_pci_reboot,
402 .ident = "Dell Precision M6600",
403 .matches = {
404 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
405 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
406 },
407 },
408 { /* Handle problems with rebooting on Dell T5400's */
409 .callback = set_bios_reboot,
410 .ident = "Dell Precision T5400",
411 .matches = {
412 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
413 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
414 },
415 },
416 { /* Handle problems with rebooting on Dell T7400's */
417 .callback = set_bios_reboot,
418 .ident = "Dell Precision T7400",
419 .matches = {
420 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
421 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
422 },
423 },
424 { /* Handle problems with rebooting on Dell XPS710 */
425 .callback = set_bios_reboot,
426 .ident = "Dell XPS710",
427 .matches = {
428 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
430 },
431 },
432 { /* Handle problems with rebooting on Dell Optiplex 7450 AIO */
433 .callback = set_acpi_reboot,
434 .ident = "Dell OptiPlex 7450 AIO",
435 .matches = {
436 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
437 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
438 },
439 },
440
441 /* Hewlett-Packard */
442 { /* Handle problems with rebooting on HP laptops */
443 .callback = set_bios_reboot,
444 .ident = "HP Compaq Laptop",
445 .matches = {
446 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
448 },
449 },
450
451 /* Sony */
452 { /* Handle problems with rebooting on Sony VGN-Z540N */
453 .callback = set_bios_reboot,
454 .ident = "Sony VGN-Z540N",
455 .matches = {
456 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
457 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
458 },
459 },
460
461 { }
462};
463
464static int __init reboot_init(void)
465{
466 int rv;
467
468 /*
469 * Only do the DMI check if reboot_type hasn't been overridden
470 * on the command line
471 */
472 if (!reboot_default)
473 return 0;
474
475 /*
476 * The DMI quirks table takes precedence. If no quirks entry
477 * matches and the ACPI Hardware Reduced bit is set and EFI
478 * runtime services are enabled, force EFI reboot.
479 */
480 rv = dmi_check_system(reboot_dmi_table);
481
482 if (!rv && efi_reboot_required() && !efi_runtime_disabled())
483 reboot_type = BOOT_EFI;
484
485 return 0;
486}
487core_initcall(reboot_init);
488
489static inline void kb_wait(void)
490{
491 int i;
492
493 for (i = 0; i < 0x10000; i++) {
494 if ((inb(0x64) & 0x02) == 0)
495 break;
496 udelay(2);
497 }
498}
499
500static void vmxoff_nmi(int cpu, struct pt_regs *regs)
501{
502 cpu_emergency_vmxoff();
503}
504
505/* Use NMIs as IPIs to tell all CPUs to disable virtualization */
506static void emergency_vmx_disable_all(void)
507{
508 /* Just make sure we won't change CPUs while doing this */
509 local_irq_disable();
510
511 /*
512 * We need to disable VMX on all CPUs before rebooting, otherwise
513 * we risk hanging up the machine, because the CPU ignore INIT
514 * signals when VMX is enabled.
515 *
516 * We can't take any locks and we may be on an inconsistent
517 * state, so we use NMIs as IPIs to tell the other CPUs to disable
518 * VMX and halt.
519 *
520 * For safety, we will avoid running the nmi_shootdown_cpus()
521 * stuff unnecessarily, but we don't have a way to check
522 * if other CPUs have VMX enabled. So we will call it only if the
523 * CPU we are running on has VMX enabled.
524 *
525 * We will miss cases where VMX is not enabled on all CPUs. This
526 * shouldn't do much harm because KVM always enable VMX on all
527 * CPUs anyway. But we can miss it on the small window where KVM
528 * is still enabling VMX.
529 */
530 if (cpu_has_vmx() && cpu_vmx_enabled()) {
531 /* Disable VMX on this CPU. */
532 cpu_vmxoff();
533
534 /* Halt and disable VMX on the other CPUs */
535 nmi_shootdown_cpus(vmxoff_nmi);
536
537 }
538}
539
540
541void __attribute__((weak)) mach_reboot_fixups(void)
542{
543}
544
545/*
546 * To the best of our knowledge Windows compatible x86 hardware expects
547 * the following on reboot:
548 *
549 * 1) If the FADT has the ACPI reboot register flag set, try it
550 * 2) If still alive, write to the keyboard controller
551 * 3) If still alive, write to the ACPI reboot register again
552 * 4) If still alive, write to the keyboard controller again
553 * 5) If still alive, call the EFI runtime service to reboot
554 * 6) If no EFI runtime service, call the BIOS to do a reboot
555 *
556 * We default to following the same pattern. We also have
557 * two other reboot methods: 'triple fault' and 'PCI', which
558 * can be triggered via the reboot= kernel boot option or
559 * via quirks.
560 *
561 * This means that this function can never return, it can misbehave
562 * by not rebooting properly and hanging.
563 */
564static void native_machine_emergency_restart(void)
565{
566 int i;
567 int attempt = 0;
568 int orig_reboot_type = reboot_type;
569 unsigned short mode;
570
571 if (reboot_emergency)
572 emergency_vmx_disable_all();
573
574 tboot_shutdown(TB_SHUTDOWN_REBOOT);
575
576 /* Tell the BIOS if we want cold or warm reboot */
577 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
578 *((unsigned short *)__va(0x472)) = mode;
579
580 /*
581 * If an EFI capsule has been registered with the firmware then
582 * override the reboot= parameter.
583 */
584 if (efi_capsule_pending(NULL)) {
585 pr_info("EFI capsule is pending, forcing EFI reboot.\n");
586 reboot_type = BOOT_EFI;
587 }
588
589 for (;;) {
590 /* Could also try the reset bit in the Hammer NB */
591 switch (reboot_type) {
592 case BOOT_ACPI:
593 acpi_reboot();
594 reboot_type = BOOT_KBD;
595 break;
596
597 case BOOT_KBD:
598 mach_reboot_fixups(); /* For board specific fixups */
599
600 for (i = 0; i < 10; i++) {
601 kb_wait();
602 udelay(50);
603 outb(0xfe, 0x64); /* Pulse reset low */
604 udelay(50);
605 }
606 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
607 attempt = 1;
608 reboot_type = BOOT_ACPI;
609 } else {
610 reboot_type = BOOT_EFI;
611 }
612 break;
613
614 case BOOT_EFI:
615 efi_reboot(reboot_mode, NULL);
616 reboot_type = BOOT_BIOS;
617 break;
618
619 case BOOT_BIOS:
620 machine_real_restart(MRR_BIOS);
621
622 /* We're probably dead after this, but... */
623 reboot_type = BOOT_CF9_SAFE;
624 break;
625
626 case BOOT_CF9_FORCE:
627 port_cf9_safe = true;
628 /* Fall through */
629
630 case BOOT_CF9_SAFE:
631 if (port_cf9_safe) {
632 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
633 u8 cf9 = inb(0xcf9) & ~reboot_code;
634 outb(cf9|2, 0xcf9); /* Request hard reset */
635 udelay(50);
636 /* Actually do the reset */
637 outb(cf9|reboot_code, 0xcf9);
638 udelay(50);
639 }
640 reboot_type = BOOT_TRIPLE;
641 break;
642
643 case BOOT_TRIPLE:
644 idt_invalidate(NULL);
645 __asm__ __volatile__("int3");
646
647 /* We're probably dead after this, but... */
648 reboot_type = BOOT_KBD;
649 break;
650 }
651 }
652}
653
654void native_machine_shutdown(void)
655{
656 /* Stop the cpus and apics */
657#ifdef CONFIG_X86_IO_APIC
658 /*
659 * Disabling IO APIC before local APIC is a workaround for
660 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
661 * Specification Update". In this situation, interrupts that target
662 * a Logical Processor whose Local APIC is either in the process of
663 * being hardware disabled or software disabled are neither delivered
664 * nor discarded. When this erratum occurs, the processor may hang.
665 *
666 * Even without the erratum, it still makes sense to quiet IO APIC
667 * before disabling Local APIC.
668 */
669 clear_IO_APIC();
670#endif
671
672#ifdef CONFIG_SMP
673 /*
674 * Stop all of the others. Also disable the local irq to
675 * not receive the per-cpu timer interrupt which may trigger
676 * scheduler's load balance.
677 */
678 local_irq_disable();
679 stop_other_cpus();
680#endif
681
682 lapic_shutdown();
683 restore_boot_irq_mode();
684
685#ifdef CONFIG_HPET_TIMER
686 hpet_disable();
687#endif
688
689#ifdef CONFIG_X86_64
690 x86_platform.iommu_shutdown();
691#endif
692}
693
694static void __machine_emergency_restart(int emergency)
695{
696 reboot_emergency = emergency;
697 machine_ops.emergency_restart();
698}
699
700static void native_machine_restart(char *__unused)
701{
702 pr_notice("machine restart\n");
703
704 if (!reboot_force)
705 machine_shutdown();
706 __machine_emergency_restart(0);
707}
708
709static void native_machine_halt(void)
710{
711 /* Stop other cpus and apics */
712 machine_shutdown();
713
714 tboot_shutdown(TB_SHUTDOWN_HALT);
715
716 stop_this_cpu(NULL);
717}
718
719static void native_machine_power_off(void)
720{
721 if (pm_power_off) {
722 if (!reboot_force)
723 machine_shutdown();
724 pm_power_off();
725 }
726 /* A fallback in case there is no PM info available */
727 tboot_shutdown(TB_SHUTDOWN_HALT);
728}
729
730struct machine_ops machine_ops __ro_after_init = {
731 .power_off = native_machine_power_off,
732 .shutdown = native_machine_shutdown,
733 .emergency_restart = native_machine_emergency_restart,
734 .restart = native_machine_restart,
735 .halt = native_machine_halt,
736#ifdef CONFIG_KEXEC_CORE
737 .crash_shutdown = native_machine_crash_shutdown,
738#endif
739};
740
741void machine_power_off(void)
742{
743 machine_ops.power_off();
744}
745
746void machine_shutdown(void)
747{
748 machine_ops.shutdown();
749}
750
751void machine_emergency_restart(void)
752{
753 __machine_emergency_restart(1);
754}
755
756void machine_restart(char *cmd)
757{
758 machine_ops.restart(cmd);
759}
760
761void machine_halt(void)
762{
763 machine_ops.halt();
764}
765
766#ifdef CONFIG_KEXEC_CORE
767void machine_crash_shutdown(struct pt_regs *regs)
768{
769 machine_ops.crash_shutdown(regs);
770}
771#endif
772
773
774/* This is the CPU performing the emergency shutdown work. */
775int crashing_cpu = -1;
776
777#if defined(CONFIG_SMP)
778
779static nmi_shootdown_cb shootdown_callback;
780
781static atomic_t waiting_for_crash_ipi;
782static int crash_ipi_issued;
783
784static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
785{
786 int cpu;
787
788 cpu = raw_smp_processor_id();
789
790 /*
791 * Don't do anything if this handler is invoked on crashing cpu.
792 * Otherwise, system will completely hang. Crashing cpu can get
793 * an NMI if system was initially booted with nmi_watchdog parameter.
794 */
795 if (cpu == crashing_cpu)
796 return NMI_HANDLED;
797 local_irq_disable();
798
799 shootdown_callback(cpu, regs);
800
801 atomic_dec(&waiting_for_crash_ipi);
802 /* Assume hlt works */
803 halt();
804 for (;;)
805 cpu_relax();
806
807 return NMI_HANDLED;
808}
809
810static void smp_send_nmi_allbutself(void)
811{
812 apic->send_IPI_allbutself(NMI_VECTOR);
813}
814
815/*
816 * Halt all other CPUs, calling the specified function on each of them
817 *
818 * This function can be used to halt all other CPUs on crash
819 * or emergency reboot time. The function passed as parameter
820 * will be called inside a NMI handler on all CPUs.
821 */
822void nmi_shootdown_cpus(nmi_shootdown_cb callback)
823{
824 unsigned long msecs;
825 local_irq_disable();
826
827 /* Make a note of crashing cpu. Will be used in NMI callback. */
828 crashing_cpu = safe_smp_processor_id();
829
830 shootdown_callback = callback;
831
832 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
833 /* Would it be better to replace the trap vector here? */
834 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
835 NMI_FLAG_FIRST, "crash"))
836 return; /* Return what? */
837 /*
838 * Ensure the new callback function is set before sending
839 * out the NMI
840 */
841 wmb();
842
843 smp_send_nmi_allbutself();
844
845 /* Kick CPUs looping in NMI context. */
846 WRITE_ONCE(crash_ipi_issued, 1);
847
848 msecs = 1000; /* Wait at most a second for the other cpus to stop */
849 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
850 mdelay(1);
851 msecs--;
852 }
853
854 /* Leave the nmi callback set */
855}
856
857/*
858 * Check if the crash dumping IPI got issued and if so, call its callback
859 * directly. This function is used when we have already been in NMI handler.
860 * It doesn't return.
861 */
862void run_crash_ipi_callback(struct pt_regs *regs)
863{
864 if (crash_ipi_issued)
865 crash_nmi_callback(0, regs);
866}
867
868/* Override the weak function in kernel/panic.c */
869void nmi_panic_self_stop(struct pt_regs *regs)
870{
871 while (1) {
872 /* If no CPU is preparing crash dump, we simply loop here. */
873 run_crash_ipi_callback(regs);
874 cpu_relax();
875 }
876}
877
878#else /* !CONFIG_SMP */
879void nmi_shootdown_cpus(nmi_shootdown_cb callback)
880{
881 /* No other CPUs to shoot down */
882}
883
884void run_crash_ipi_callback(struct pt_regs *regs)
885{
886}
887#endif
1#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
2
3#include <linux/export.h>
4#include <linux/reboot.h>
5#include <linux/init.h>
6#include <linux/pm.h>
7#include <linux/efi.h>
8#include <linux/dmi.h>
9#include <linux/sched.h>
10#include <linux/tboot.h>
11#include <linux/delay.h>
12#include <acpi/reboot.h>
13#include <asm/io.h>
14#include <asm/apic.h>
15#include <asm/io_apic.h>
16#include <asm/desc.h>
17#include <asm/hpet.h>
18#include <asm/pgtable.h>
19#include <asm/proto.h>
20#include <asm/reboot_fixups.h>
21#include <asm/reboot.h>
22#include <asm/pci_x86.h>
23#include <asm/virtext.h>
24#include <asm/cpu.h>
25#include <asm/nmi.h>
26#include <asm/smp.h>
27
28#include <linux/ctype.h>
29#include <linux/mc146818rtc.h>
30#include <asm/realmode.h>
31#include <asm/x86_init.h>
32#include <asm/efi.h>
33
34/*
35 * Power off function, if any
36 */
37void (*pm_power_off)(void);
38EXPORT_SYMBOL(pm_power_off);
39
40static const struct desc_ptr no_idt = {};
41
42/*
43 * This is set if we need to go through the 'emergency' path.
44 * When machine_emergency_restart() is called, we may be on
45 * an inconsistent state and won't be able to do a clean cleanup
46 */
47static int reboot_emergency;
48
49/* This is set by the PCI code if either type 1 or type 2 PCI is detected */
50bool port_cf9_safe = false;
51
52/*
53 * Reboot options and system auto-detection code provided by
54 * Dell Inc. so their systems "just work". :-)
55 */
56
57/*
58 * Some machines require the "reboot=a" commandline options
59 */
60static int __init set_acpi_reboot(const struct dmi_system_id *d)
61{
62 if (reboot_type != BOOT_ACPI) {
63 reboot_type = BOOT_ACPI;
64 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
65 d->ident, "ACPI");
66 }
67 return 0;
68}
69
70/*
71 * Some machines require the "reboot=b" or "reboot=k" commandline options,
72 * this quirk makes that automatic.
73 */
74static int __init set_bios_reboot(const struct dmi_system_id *d)
75{
76 if (reboot_type != BOOT_BIOS) {
77 reboot_type = BOOT_BIOS;
78 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
79 d->ident, "BIOS");
80 }
81 return 0;
82}
83
84void __noreturn machine_real_restart(unsigned int type)
85{
86 local_irq_disable();
87
88 /*
89 * Write zero to CMOS register number 0x0f, which the BIOS POST
90 * routine will recognize as telling it to do a proper reboot. (Well
91 * that's what this book in front of me says -- it may only apply to
92 * the Phoenix BIOS though, it's not clear). At the same time,
93 * disable NMIs by setting the top bit in the CMOS address register,
94 * as we're about to do peculiar things to the CPU. I'm not sure if
95 * `outb_p' is needed instead of just `outb'. Use it to be on the
96 * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.)
97 */
98 spin_lock(&rtc_lock);
99 CMOS_WRITE(0x00, 0x8f);
100 spin_unlock(&rtc_lock);
101
102 /*
103 * Switch back to the initial page table.
104 */
105#ifdef CONFIG_X86_32
106 load_cr3(initial_page_table);
107#else
108 write_cr3(real_mode_header->trampoline_pgd);
109#endif
110
111 /* Jump to the identity-mapped low memory code */
112#ifdef CONFIG_X86_32
113 asm volatile("jmpl *%0" : :
114 "rm" (real_mode_header->machine_real_restart_asm),
115 "a" (type));
116#else
117 asm volatile("ljmpl *%0" : :
118 "m" (real_mode_header->machine_real_restart_asm),
119 "D" (type));
120#endif
121 unreachable();
122}
123#ifdef CONFIG_APM_MODULE
124EXPORT_SYMBOL(machine_real_restart);
125#endif
126
127/*
128 * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
129 */
130static int __init set_pci_reboot(const struct dmi_system_id *d)
131{
132 if (reboot_type != BOOT_CF9_FORCE) {
133 reboot_type = BOOT_CF9_FORCE;
134 pr_info("%s series board detected. Selecting %s-method for reboots.\n",
135 d->ident, "PCI");
136 }
137 return 0;
138}
139
140static int __init set_kbd_reboot(const struct dmi_system_id *d)
141{
142 if (reboot_type != BOOT_KBD) {
143 reboot_type = BOOT_KBD;
144 pr_info("%s series board detected. Selecting %s-method for reboot.\n",
145 d->ident, "KBD");
146 }
147 return 0;
148}
149
150/*
151 * This is a single dmi_table handling all reboot quirks.
152 */
153static struct dmi_system_id __initdata reboot_dmi_table[] = {
154
155 /* Acer */
156 { /* Handle reboot issue on Acer Aspire one */
157 .callback = set_kbd_reboot,
158 .ident = "Acer Aspire One A110",
159 .matches = {
160 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
161 DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
162 },
163 },
164
165 /* Apple */
166 { /* Handle problems with rebooting on Apple MacBook5 */
167 .callback = set_pci_reboot,
168 .ident = "Apple MacBook5",
169 .matches = {
170 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
171 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"),
172 },
173 },
174 { /* Handle problems with rebooting on Apple MacBookPro5 */
175 .callback = set_pci_reboot,
176 .ident = "Apple MacBookPro5",
177 .matches = {
178 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
179 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"),
180 },
181 },
182 { /* Handle problems with rebooting on Apple Macmini3,1 */
183 .callback = set_pci_reboot,
184 .ident = "Apple Macmini3,1",
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
187 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"),
188 },
189 },
190 { /* Handle problems with rebooting on the iMac9,1. */
191 .callback = set_pci_reboot,
192 .ident = "Apple iMac9,1",
193 .matches = {
194 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
195 DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"),
196 },
197 },
198 { /* Handle problems with rebooting on the iMac10,1. */
199 .callback = set_pci_reboot,
200 .ident = "Apple iMac10,1",
201 .matches = {
202 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
203 DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"),
204 },
205 },
206
207 /* ASRock */
208 { /* Handle problems with rebooting on ASRock Q1900DC-ITX */
209 .callback = set_pci_reboot,
210 .ident = "ASRock Q1900DC-ITX",
211 .matches = {
212 DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"),
213 DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"),
214 },
215 },
216
217 /* ASUS */
218 { /* Handle problems with rebooting on ASUS P4S800 */
219 .callback = set_bios_reboot,
220 .ident = "ASUS P4S800",
221 .matches = {
222 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
223 DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
224 },
225 },
226 { /* Handle problems with rebooting on ASUS EeeBook X205TA */
227 .callback = set_acpi_reboot,
228 .ident = "ASUS EeeBook X205TA",
229 .matches = {
230 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
231 DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"),
232 },
233 },
234 { /* Handle problems with rebooting on ASUS EeeBook X205TAW */
235 .callback = set_acpi_reboot,
236 .ident = "ASUS EeeBook X205TAW",
237 .matches = {
238 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
239 DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"),
240 },
241 },
242
243 /* Certec */
244 { /* Handle problems with rebooting on Certec BPC600 */
245 .callback = set_pci_reboot,
246 .ident = "Certec BPC600",
247 .matches = {
248 DMI_MATCH(DMI_SYS_VENDOR, "Certec"),
249 DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"),
250 },
251 },
252
253 /* Dell */
254 { /* Handle problems with rebooting on Dell DXP061 */
255 .callback = set_bios_reboot,
256 .ident = "Dell DXP061",
257 .matches = {
258 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
259 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"),
260 },
261 },
262 { /* Handle problems with rebooting on Dell E520's */
263 .callback = set_bios_reboot,
264 .ident = "Dell E520",
265 .matches = {
266 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
267 DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"),
268 },
269 },
270 { /* Handle problems with rebooting on the Latitude E5410. */
271 .callback = set_pci_reboot,
272 .ident = "Dell Latitude E5410",
273 .matches = {
274 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
275 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"),
276 },
277 },
278 { /* Handle problems with rebooting on the Latitude E5420. */
279 .callback = set_pci_reboot,
280 .ident = "Dell Latitude E5420",
281 .matches = {
282 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
283 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"),
284 },
285 },
286 { /* Handle problems with rebooting on the Latitude E6320. */
287 .callback = set_pci_reboot,
288 .ident = "Dell Latitude E6320",
289 .matches = {
290 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
291 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"),
292 },
293 },
294 { /* Handle problems with rebooting on the Latitude E6420. */
295 .callback = set_pci_reboot,
296 .ident = "Dell Latitude E6420",
297 .matches = {
298 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
299 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"),
300 },
301 },
302 { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */
303 .callback = set_bios_reboot,
304 .ident = "Dell OptiPlex 330",
305 .matches = {
306 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
307 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"),
308 DMI_MATCH(DMI_BOARD_NAME, "0KP561"),
309 },
310 },
311 { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */
312 .callback = set_bios_reboot,
313 .ident = "Dell OptiPlex 360",
314 .matches = {
315 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
316 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"),
317 DMI_MATCH(DMI_BOARD_NAME, "0T656F"),
318 },
319 },
320 { /* Handle problems with rebooting on Dell Optiplex 745's SFF */
321 .callback = set_bios_reboot,
322 .ident = "Dell OptiPlex 745",
323 .matches = {
324 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
325 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
326 },
327 },
328 { /* Handle problems with rebooting on Dell Optiplex 745's DFF */
329 .callback = set_bios_reboot,
330 .ident = "Dell OptiPlex 745",
331 .matches = {
332 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
333 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
334 DMI_MATCH(DMI_BOARD_NAME, "0MM599"),
335 },
336 },
337 { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */
338 .callback = set_bios_reboot,
339 .ident = "Dell OptiPlex 745",
340 .matches = {
341 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
342 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"),
343 DMI_MATCH(DMI_BOARD_NAME, "0KW626"),
344 },
345 },
346 { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */
347 .callback = set_bios_reboot,
348 .ident = "Dell OptiPlex 760",
349 .matches = {
350 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
351 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"),
352 DMI_MATCH(DMI_BOARD_NAME, "0G919G"),
353 },
354 },
355 { /* Handle problems with rebooting on the OptiPlex 990. */
356 .callback = set_pci_reboot,
357 .ident = "Dell OptiPlex 990",
358 .matches = {
359 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
360 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"),
361 },
362 },
363 { /* Handle problems with rebooting on Dell 300's */
364 .callback = set_bios_reboot,
365 .ident = "Dell PowerEdge 300",
366 .matches = {
367 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
368 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"),
369 },
370 },
371 { /* Handle problems with rebooting on Dell 1300's */
372 .callback = set_bios_reboot,
373 .ident = "Dell PowerEdge 1300",
374 .matches = {
375 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
376 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
377 },
378 },
379 { /* Handle problems with rebooting on Dell 2400's */
380 .callback = set_bios_reboot,
381 .ident = "Dell PowerEdge 2400",
382 .matches = {
383 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
384 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"),
385 },
386 },
387 { /* Handle problems with rebooting on the Dell PowerEdge C6100. */
388 .callback = set_pci_reboot,
389 .ident = "Dell PowerEdge C6100",
390 .matches = {
391 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
392 DMI_MATCH(DMI_PRODUCT_NAME, "C6100"),
393 },
394 },
395 { /* Handle problems with rebooting on the Precision M6600. */
396 .callback = set_pci_reboot,
397 .ident = "Dell Precision M6600",
398 .matches = {
399 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
400 DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"),
401 },
402 },
403 { /* Handle problems with rebooting on Dell T5400's */
404 .callback = set_bios_reboot,
405 .ident = "Dell Precision T5400",
406 .matches = {
407 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
408 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"),
409 },
410 },
411 { /* Handle problems with rebooting on Dell T7400's */
412 .callback = set_bios_reboot,
413 .ident = "Dell Precision T7400",
414 .matches = {
415 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
416 DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"),
417 },
418 },
419 { /* Handle problems with rebooting on Dell XPS710 */
420 .callback = set_bios_reboot,
421 .ident = "Dell XPS710",
422 .matches = {
423 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
424 DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"),
425 },
426 },
427 { /* Handle problems with rebooting on Dell Optiplex 7450 AIO */
428 .callback = set_acpi_reboot,
429 .ident = "Dell OptiPlex 7450 AIO",
430 .matches = {
431 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
432 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"),
433 },
434 },
435
436 /* Hewlett-Packard */
437 { /* Handle problems with rebooting on HP laptops */
438 .callback = set_bios_reboot,
439 .ident = "HP Compaq Laptop",
440 .matches = {
441 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
442 DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"),
443 },
444 },
445
446 /* Sony */
447 { /* Handle problems with rebooting on Sony VGN-Z540N */
448 .callback = set_bios_reboot,
449 .ident = "Sony VGN-Z540N",
450 .matches = {
451 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
452 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"),
453 },
454 },
455
456 { }
457};
458
459static int __init reboot_init(void)
460{
461 int rv;
462
463 /*
464 * Only do the DMI check if reboot_type hasn't been overridden
465 * on the command line
466 */
467 if (!reboot_default)
468 return 0;
469
470 /*
471 * The DMI quirks table takes precedence. If no quirks entry
472 * matches and the ACPI Hardware Reduced bit is set, force EFI
473 * reboot.
474 */
475 rv = dmi_check_system(reboot_dmi_table);
476
477 if (!rv && efi_reboot_required())
478 reboot_type = BOOT_EFI;
479
480 return 0;
481}
482core_initcall(reboot_init);
483
484static inline void kb_wait(void)
485{
486 int i;
487
488 for (i = 0; i < 0x10000; i++) {
489 if ((inb(0x64) & 0x02) == 0)
490 break;
491 udelay(2);
492 }
493}
494
495static void vmxoff_nmi(int cpu, struct pt_regs *regs)
496{
497 cpu_emergency_vmxoff();
498}
499
500/* Use NMIs as IPIs to tell all CPUs to disable virtualization */
501static void emergency_vmx_disable_all(void)
502{
503 /* Just make sure we won't change CPUs while doing this */
504 local_irq_disable();
505
506 /*
507 * We need to disable VMX on all CPUs before rebooting, otherwise
508 * we risk hanging up the machine, because the CPU ignore INIT
509 * signals when VMX is enabled.
510 *
511 * We can't take any locks and we may be on an inconsistent
512 * state, so we use NMIs as IPIs to tell the other CPUs to disable
513 * VMX and halt.
514 *
515 * For safety, we will avoid running the nmi_shootdown_cpus()
516 * stuff unnecessarily, but we don't have a way to check
517 * if other CPUs have VMX enabled. So we will call it only if the
518 * CPU we are running on has VMX enabled.
519 *
520 * We will miss cases where VMX is not enabled on all CPUs. This
521 * shouldn't do much harm because KVM always enable VMX on all
522 * CPUs anyway. But we can miss it on the small window where KVM
523 * is still enabling VMX.
524 */
525 if (cpu_has_vmx() && cpu_vmx_enabled()) {
526 /* Disable VMX on this CPU. */
527 cpu_vmxoff();
528
529 /* Halt and disable VMX on the other CPUs */
530 nmi_shootdown_cpus(vmxoff_nmi);
531
532 }
533}
534
535
536void __attribute__((weak)) mach_reboot_fixups(void)
537{
538}
539
540/*
541 * To the best of our knowledge Windows compatible x86 hardware expects
542 * the following on reboot:
543 *
544 * 1) If the FADT has the ACPI reboot register flag set, try it
545 * 2) If still alive, write to the keyboard controller
546 * 3) If still alive, write to the ACPI reboot register again
547 * 4) If still alive, write to the keyboard controller again
548 * 5) If still alive, call the EFI runtime service to reboot
549 * 6) If no EFI runtime service, call the BIOS to do a reboot
550 *
551 * We default to following the same pattern. We also have
552 * two other reboot methods: 'triple fault' and 'PCI', which
553 * can be triggered via the reboot= kernel boot option or
554 * via quirks.
555 *
556 * This means that this function can never return, it can misbehave
557 * by not rebooting properly and hanging.
558 */
559static void native_machine_emergency_restart(void)
560{
561 int i;
562 int attempt = 0;
563 int orig_reboot_type = reboot_type;
564 unsigned short mode;
565
566 if (reboot_emergency)
567 emergency_vmx_disable_all();
568
569 tboot_shutdown(TB_SHUTDOWN_REBOOT);
570
571 /* Tell the BIOS if we want cold or warm reboot */
572 mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0;
573 *((unsigned short *)__va(0x472)) = mode;
574
575 /*
576 * If an EFI capsule has been registered with the firmware then
577 * override the reboot= parameter.
578 */
579 if (efi_capsule_pending(NULL)) {
580 pr_info("EFI capsule is pending, forcing EFI reboot.\n");
581 reboot_type = BOOT_EFI;
582 }
583
584 for (;;) {
585 /* Could also try the reset bit in the Hammer NB */
586 switch (reboot_type) {
587 case BOOT_ACPI:
588 acpi_reboot();
589 reboot_type = BOOT_KBD;
590 break;
591
592 case BOOT_KBD:
593 mach_reboot_fixups(); /* For board specific fixups */
594
595 for (i = 0; i < 10; i++) {
596 kb_wait();
597 udelay(50);
598 outb(0xfe, 0x64); /* Pulse reset low */
599 udelay(50);
600 }
601 if (attempt == 0 && orig_reboot_type == BOOT_ACPI) {
602 attempt = 1;
603 reboot_type = BOOT_ACPI;
604 } else {
605 reboot_type = BOOT_EFI;
606 }
607 break;
608
609 case BOOT_EFI:
610 efi_reboot(reboot_mode, NULL);
611 reboot_type = BOOT_BIOS;
612 break;
613
614 case BOOT_BIOS:
615 machine_real_restart(MRR_BIOS);
616
617 /* We're probably dead after this, but... */
618 reboot_type = BOOT_CF9_SAFE;
619 break;
620
621 case BOOT_CF9_FORCE:
622 port_cf9_safe = true;
623 /* Fall through */
624
625 case BOOT_CF9_SAFE:
626 if (port_cf9_safe) {
627 u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E;
628 u8 cf9 = inb(0xcf9) & ~reboot_code;
629 outb(cf9|2, 0xcf9); /* Request hard reset */
630 udelay(50);
631 /* Actually do the reset */
632 outb(cf9|reboot_code, 0xcf9);
633 udelay(50);
634 }
635 reboot_type = BOOT_TRIPLE;
636 break;
637
638 case BOOT_TRIPLE:
639 load_idt(&no_idt);
640 __asm__ __volatile__("int3");
641
642 /* We're probably dead after this, but... */
643 reboot_type = BOOT_KBD;
644 break;
645 }
646 }
647}
648
649void native_machine_shutdown(void)
650{
651 /* Stop the cpus and apics */
652#ifdef CONFIG_X86_IO_APIC
653 /*
654 * Disabling IO APIC before local APIC is a workaround for
655 * erratum AVR31 in "Intel Atom Processor C2000 Product Family
656 * Specification Update". In this situation, interrupts that target
657 * a Logical Processor whose Local APIC is either in the process of
658 * being hardware disabled or software disabled are neither delivered
659 * nor discarded. When this erratum occurs, the processor may hang.
660 *
661 * Even without the erratum, it still makes sense to quiet IO APIC
662 * before disabling Local APIC.
663 */
664 disable_IO_APIC();
665#endif
666
667#ifdef CONFIG_SMP
668 /*
669 * Stop all of the others. Also disable the local irq to
670 * not receive the per-cpu timer interrupt which may trigger
671 * scheduler's load balance.
672 */
673 local_irq_disable();
674 stop_other_cpus();
675#endif
676
677 lapic_shutdown();
678
679#ifdef CONFIG_HPET_TIMER
680 hpet_disable();
681#endif
682
683#ifdef CONFIG_X86_64
684 x86_platform.iommu_shutdown();
685#endif
686}
687
688static void __machine_emergency_restart(int emergency)
689{
690 reboot_emergency = emergency;
691 machine_ops.emergency_restart();
692}
693
694static void native_machine_restart(char *__unused)
695{
696 pr_notice("machine restart\n");
697
698 if (!reboot_force)
699 machine_shutdown();
700 __machine_emergency_restart(0);
701}
702
703static void native_machine_halt(void)
704{
705 /* Stop other cpus and apics */
706 machine_shutdown();
707
708 tboot_shutdown(TB_SHUTDOWN_HALT);
709
710 stop_this_cpu(NULL);
711}
712
713static void native_machine_power_off(void)
714{
715 if (pm_power_off) {
716 if (!reboot_force)
717 machine_shutdown();
718 pm_power_off();
719 }
720 /* A fallback in case there is no PM info available */
721 tboot_shutdown(TB_SHUTDOWN_HALT);
722}
723
724struct machine_ops machine_ops __ro_after_init = {
725 .power_off = native_machine_power_off,
726 .shutdown = native_machine_shutdown,
727 .emergency_restart = native_machine_emergency_restart,
728 .restart = native_machine_restart,
729 .halt = native_machine_halt,
730#ifdef CONFIG_KEXEC_CORE
731 .crash_shutdown = native_machine_crash_shutdown,
732#endif
733};
734
735void machine_power_off(void)
736{
737 machine_ops.power_off();
738}
739
740void machine_shutdown(void)
741{
742 machine_ops.shutdown();
743}
744
745void machine_emergency_restart(void)
746{
747 __machine_emergency_restart(1);
748}
749
750void machine_restart(char *cmd)
751{
752 machine_ops.restart(cmd);
753}
754
755void machine_halt(void)
756{
757 machine_ops.halt();
758}
759
760#ifdef CONFIG_KEXEC_CORE
761void machine_crash_shutdown(struct pt_regs *regs)
762{
763 machine_ops.crash_shutdown(regs);
764}
765#endif
766
767
768#if defined(CONFIG_SMP)
769
770/* This keeps a track of which one is crashing cpu. */
771static int crashing_cpu;
772static nmi_shootdown_cb shootdown_callback;
773
774static atomic_t waiting_for_crash_ipi;
775static int crash_ipi_issued;
776
777static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
778{
779 int cpu;
780
781 cpu = raw_smp_processor_id();
782
783 /*
784 * Don't do anything if this handler is invoked on crashing cpu.
785 * Otherwise, system will completely hang. Crashing cpu can get
786 * an NMI if system was initially booted with nmi_watchdog parameter.
787 */
788 if (cpu == crashing_cpu)
789 return NMI_HANDLED;
790 local_irq_disable();
791
792 shootdown_callback(cpu, regs);
793
794 atomic_dec(&waiting_for_crash_ipi);
795 /* Assume hlt works */
796 halt();
797 for (;;)
798 cpu_relax();
799
800 return NMI_HANDLED;
801}
802
803static void smp_send_nmi_allbutself(void)
804{
805 apic->send_IPI_allbutself(NMI_VECTOR);
806}
807
808/*
809 * Halt all other CPUs, calling the specified function on each of them
810 *
811 * This function can be used to halt all other CPUs on crash
812 * or emergency reboot time. The function passed as parameter
813 * will be called inside a NMI handler on all CPUs.
814 */
815void nmi_shootdown_cpus(nmi_shootdown_cb callback)
816{
817 unsigned long msecs;
818 local_irq_disable();
819
820 /* Make a note of crashing cpu. Will be used in NMI callback. */
821 crashing_cpu = safe_smp_processor_id();
822
823 shootdown_callback = callback;
824
825 atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
826 /* Would it be better to replace the trap vector here? */
827 if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback,
828 NMI_FLAG_FIRST, "crash"))
829 return; /* Return what? */
830 /*
831 * Ensure the new callback function is set before sending
832 * out the NMI
833 */
834 wmb();
835
836 smp_send_nmi_allbutself();
837
838 /* Kick CPUs looping in NMI context. */
839 WRITE_ONCE(crash_ipi_issued, 1);
840
841 msecs = 1000; /* Wait at most a second for the other cpus to stop */
842 while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
843 mdelay(1);
844 msecs--;
845 }
846
847 /* Leave the nmi callback set */
848}
849
850/*
851 * Check if the crash dumping IPI got issued and if so, call its callback
852 * directly. This function is used when we have already been in NMI handler.
853 * It doesn't return.
854 */
855void run_crash_ipi_callback(struct pt_regs *regs)
856{
857 if (crash_ipi_issued)
858 crash_nmi_callback(0, regs);
859}
860
861/* Override the weak function in kernel/panic.c */
862void nmi_panic_self_stop(struct pt_regs *regs)
863{
864 while (1) {
865 /* If no CPU is preparing crash dump, we simply loop here. */
866 run_crash_ipi_callback(regs);
867 cpu_relax();
868 }
869}
870
871#else /* !CONFIG_SMP */
872void nmi_shootdown_cpus(nmi_shootdown_cb callback)
873{
874 /* No other CPUs to shoot down */
875}
876
877void run_crash_ipi_callback(struct pt_regs *regs)
878{
879}
880#endif