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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c767a54b JP |
2 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
3 | ||
186f4360 | 4 | #include <linux/export.h> |
cd6ed525 | 5 | #include <linux/reboot.h> |
4d022e35 MB |
6 | #include <linux/init.h> |
7 | #include <linux/pm.h> | |
8 | #include <linux/efi.h> | |
6c6c51e4 | 9 | #include <linux/dmi.h> |
d43c36dc | 10 | #include <linux/sched.h> |
69575d38 | 11 | #include <linux/tboot.h> |
ca444564 | 12 | #include <linux/delay.h> |
00089c04 | 13 | #include <linux/objtool.h> |
65fddcfc | 14 | #include <linux/pgtable.h> |
4d022e35 MB |
15 | #include <acpi/reboot.h> |
16 | #include <asm/io.h> | |
1da177e4 | 17 | #include <asm/apic.h> |
8643e28d | 18 | #include <asm/io_apic.h> |
4d37e7e3 | 19 | #include <asm/desc.h> |
4d022e35 | 20 | #include <asm/hpet.h> |
4412620f | 21 | #include <asm/proto.h> |
973efae2 | 22 | #include <asm/reboot_fixups.h> |
07f3331c | 23 | #include <asm/reboot.h> |
82487711 | 24 | #include <asm/pci_x86.h> |
d176720d | 25 | #include <asm/virtext.h> |
96b89dc6 | 26 | #include <asm/cpu.h> |
c410b830 | 27 | #include <asm/nmi.h> |
65051397 | 28 | #include <asm/smp.h> |
1da177e4 | 29 | |
65051397 PA |
30 | #include <linux/ctype.h> |
31 | #include <linux/mc146818rtc.h> | |
32 | #include <asm/realmode.h> | |
33 | #include <asm/x86_init.h> | |
44be28e9 | 34 | #include <asm/efi.h> |
6caa55e3 | 35 | #include <asm/nospec-branch.h> |
4d022e35 | 36 | |
1da177e4 LT |
37 | /* |
38 | * Power off function, if any | |
39 | */ | |
40 | void (*pm_power_off)(void); | |
129f6946 | 41 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 | 42 | |
144d102b ML |
43 | /* |
44 | * This is set if we need to go through the 'emergency' path. | |
d176720d EH |
45 | * When machine_emergency_restart() is called, we may be on |
46 | * an inconsistent state and won't be able to do a clean cleanup | |
47 | */ | |
48 | static int reboot_emergency; | |
49 | ||
14d7ca5c PA |
50 | /* This is set by the PCI code if either type 1 or type 2 PCI is detected */ |
51 | bool port_cf9_safe = false; | |
52 | ||
1da177e4 LT |
53 | /* |
54 | * Reboot options and system auto-detection code provided by | |
55 | * Dell Inc. so their systems "just work". :-) | |
56 | */ | |
57 | ||
4d581259 AH |
58 | /* |
59 | * Some machines require the "reboot=a" commandline options | |
60 | */ | |
61 | static int __init set_acpi_reboot(const struct dmi_system_id *d) | |
62 | { | |
63 | if (reboot_type != BOOT_ACPI) { | |
64 | reboot_type = BOOT_ACPI; | |
65 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", | |
66 | d->ident, "ACPI"); | |
67 | } | |
68 | return 0; | |
69 | } | |
70 | ||
1da177e4 | 71 | /* |
1ef03890 | 72 | * Some machines require the "reboot=b" or "reboot=k" commandline options, |
4d022e35 | 73 | * this quirk makes that automatic. |
1da177e4 | 74 | */ |
1855256c | 75 | static int __init set_bios_reboot(const struct dmi_system_id *d) |
1da177e4 | 76 | { |
4d022e35 MB |
77 | if (reboot_type != BOOT_BIOS) { |
78 | reboot_type = BOOT_BIOS; | |
c767a54b | 79 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
6d9153bb | 80 | d->ident, "BIOS"); |
1da177e4 LT |
81 | } |
82 | return 0; | |
83 | } | |
84 | ||
0082517f JHP |
85 | /* |
86 | * Some machines don't handle the default ACPI reboot method and | |
87 | * require the EFI reboot method: | |
88 | */ | |
89 | static int __init set_efi_reboot(const struct dmi_system_id *d) | |
90 | { | |
91 | if (reboot_type != BOOT_EFI && !efi_runtime_disabled()) { | |
92 | reboot_type = BOOT_EFI; | |
93 | pr_info("%s series board detected. Selecting EFI-method for reboot.\n", d->ident); | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
65051397 | 98 | void __noreturn machine_real_restart(unsigned int type) |
57b16594 | 99 | { |
57b16594 ML |
100 | local_irq_disable(); |
101 | ||
144d102b ML |
102 | /* |
103 | * Write zero to CMOS register number 0x0f, which the BIOS POST | |
104 | * routine will recognize as telling it to do a proper reboot. (Well | |
105 | * that's what this book in front of me says -- it may only apply to | |
106 | * the Phoenix BIOS though, it's not clear). At the same time, | |
107 | * disable NMIs by setting the top bit in the CMOS address register, | |
108 | * as we're about to do peculiar things to the CPU. I'm not sure if | |
109 | * `outb_p' is needed instead of just `outb'. Use it to be on the | |
110 | * safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) | |
57b16594 ML |
111 | */ |
112 | spin_lock(&rtc_lock); | |
113 | CMOS_WRITE(0x00, 0x8f); | |
114 | spin_unlock(&rtc_lock); | |
115 | ||
116 | /* | |
117 | * Switch back to the initial page table. | |
118 | */ | |
65051397 | 119 | #ifdef CONFIG_X86_32 |
57b16594 | 120 | load_cr3(initial_page_table); |
65051397 PA |
121 | #else |
122 | write_cr3(real_mode_header->trampoline_pgd); | |
924c6b90 AL |
123 | |
124 | /* Exiting long mode will fail if CR4.PCIDE is set. */ | |
67e87d43 | 125 | if (boot_cpu_has(X86_FEATURE_PCID)) |
924c6b90 | 126 | cr4_clear_bits(X86_CR4_PCIDE); |
65051397 | 127 | #endif |
57b16594 | 128 | |
57b16594 | 129 | /* Jump to the identity-mapped low memory code */ |
65051397 | 130 | #ifdef CONFIG_X86_32 |
6caa55e3 | 131 | asm volatile(ANNOTATE_RETPOLINE_SAFE "jmpl *%0" : : |
65051397 PA |
132 | "rm" (real_mode_header->machine_real_restart_asm), |
133 | "a" (type)); | |
134 | #else | |
6caa55e3 | 135 | asm volatile(ANNOTATE_RETPOLINE_SAFE "ljmpl *%0" : : |
65051397 PA |
136 | "m" (real_mode_header->machine_real_restart_asm), |
137 | "D" (type)); | |
138 | #endif | |
139 | unreachable(); | |
57b16594 ML |
140 | } |
141 | #ifdef CONFIG_APM_MODULE | |
142 | EXPORT_SYMBOL(machine_real_restart); | |
143 | #endif | |
c207aee4 | 144 | STACK_FRAME_NON_STANDARD(machine_real_restart); |
57b16594 | 145 | |
57b16594 ML |
146 | /* |
147 | * Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot | |
148 | */ | |
149 | static int __init set_pci_reboot(const struct dmi_system_id *d) | |
150 | { | |
5be44a6f IM |
151 | if (reboot_type != BOOT_CF9_FORCE) { |
152 | reboot_type = BOOT_CF9_FORCE; | |
c767a54b | 153 | pr_info("%s series board detected. Selecting %s-method for reboots.\n", |
6d9153bb | 154 | d->ident, "PCI"); |
57b16594 ML |
155 | } |
156 | return 0; | |
157 | } | |
158 | ||
1ef03890 PC |
159 | static int __init set_kbd_reboot(const struct dmi_system_id *d) |
160 | { | |
161 | if (reboot_type != BOOT_KBD) { | |
162 | reboot_type = BOOT_KBD; | |
c767a54b | 163 | pr_info("%s series board detected. Selecting %s-method for reboot.\n", |
6d9153bb | 164 | d->ident, "KBD"); |
1ef03890 PC |
165 | } |
166 | return 0; | |
167 | } | |
168 | ||
144d102b | 169 | /* |
65051397 | 170 | * This is a single dmi_table handling all reboot quirks. |
57b16594 | 171 | */ |
6faadbbb | 172 | static const struct dmi_system_id reboot_dmi_table[] __initconst = { |
e56e57f6 DJ |
173 | |
174 | /* Acer */ | |
175 | { /* Handle reboot issue on Acer Aspire one */ | |
176 | .callback = set_kbd_reboot, | |
177 | .ident = "Acer Aspire One A110", | |
b9e82af8 | 178 | .matches = { |
e56e57f6 DJ |
179 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
180 | DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"), | |
b9e82af8 TG |
181 | }, |
182 | }, | |
0082517f JHP |
183 | { /* Handle reboot issue on Acer TravelMate X514-51T */ |
184 | .callback = set_efi_reboot, | |
185 | .ident = "Acer TravelMate X514-51T", | |
186 | .matches = { | |
187 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
188 | DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"), | |
189 | }, | |
190 | }, | |
e56e57f6 DJ |
191 | |
192 | /* Apple */ | |
193 | { /* Handle problems with rebooting on Apple MacBook5 */ | |
194 | .callback = set_pci_reboot, | |
195 | .ident = "Apple MacBook5", | |
1da177e4 | 196 | .matches = { |
e56e57f6 DJ |
197 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
198 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5"), | |
1da177e4 LT |
199 | }, |
200 | }, | |
140fd4ac HM |
201 | { /* Handle problems with rebooting on Apple MacBook6,1 */ |
202 | .callback = set_pci_reboot, | |
203 | .ident = "Apple MacBook6,1", | |
204 | .matches = { | |
205 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
206 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook6,1"), | |
207 | }, | |
208 | }, | |
e56e57f6 DJ |
209 | { /* Handle problems with rebooting on Apple MacBookPro5 */ |
210 | .callback = set_pci_reboot, | |
211 | .ident = "Apple MacBookPro5", | |
1da177e4 | 212 | .matches = { |
e56e57f6 DJ |
213 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
214 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5"), | |
1da177e4 LT |
215 | }, |
216 | }, | |
e56e57f6 DJ |
217 | { /* Handle problems with rebooting on Apple Macmini3,1 */ |
218 | .callback = set_pci_reboot, | |
219 | .ident = "Apple Macmini3,1", | |
df2edcf3 | 220 | .matches = { |
e56e57f6 DJ |
221 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
222 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini3,1"), | |
df2edcf3 JJ |
223 | }, |
224 | }, | |
e56e57f6 DJ |
225 | { /* Handle problems with rebooting on the iMac9,1. */ |
226 | .callback = set_pci_reboot, | |
227 | .ident = "Apple iMac9,1", | |
fc115bf1 | 228 | .matches = { |
e56e57f6 DJ |
229 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
230 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac9,1"), | |
fc115bf1 CK |
231 | }, |
232 | }, | |
2f0c0b2d MK |
233 | { /* Handle problems with rebooting on the iMac10,1. */ |
234 | .callback = set_pci_reboot, | |
235 | .ident = "Apple iMac10,1", | |
236 | .matches = { | |
237 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
238 | DMI_MATCH(DMI_PRODUCT_NAME, "iMac10,1"), | |
239 | }, | |
240 | }, | |
e56e57f6 | 241 | |
80313b30 SLH |
242 | /* ASRock */ |
243 | { /* Handle problems with rebooting on ASRock Q1900DC-ITX */ | |
244 | .callback = set_pci_reboot, | |
245 | .ident = "ASRock Q1900DC-ITX", | |
246 | .matches = { | |
247 | DMI_MATCH(DMI_BOARD_VENDOR, "ASRock"), | |
248 | DMI_MATCH(DMI_BOARD_NAME, "Q1900DC-ITX"), | |
249 | }, | |
250 | }, | |
251 | ||
e56e57f6 DJ |
252 | /* ASUS */ |
253 | { /* Handle problems with rebooting on ASUS P4S800 */ | |
fc1c8925 | 254 | .callback = set_bios_reboot, |
e56e57f6 | 255 | .ident = "ASUS P4S800", |
fc1c8925 | 256 | .matches = { |
e56e57f6 DJ |
257 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), |
258 | DMI_MATCH(DMI_BOARD_NAME, "P4S800"), | |
fc1c8925 HAA |
259 | }, |
260 | }, | |
90b28ded MH |
261 | { /* Handle problems with rebooting on ASUS EeeBook X205TA */ |
262 | .callback = set_acpi_reboot, | |
263 | .ident = "ASUS EeeBook X205TA", | |
264 | .matches = { | |
265 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
bba8376a | 266 | DMI_MATCH(DMI_PRODUCT_NAME, "X205TA"), |
90b28ded MH |
267 | }, |
268 | }, | |
3b3e7855 MH |
269 | { /* Handle problems with rebooting on ASUS EeeBook X205TAW */ |
270 | .callback = set_acpi_reboot, | |
271 | .ident = "ASUS EeeBook X205TAW", | |
272 | .matches = { | |
273 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
274 | DMI_MATCH(DMI_PRODUCT_NAME, "X205TAW"), | |
275 | }, | |
276 | }, | |
e56e57f6 | 277 | |
aadca6fa CG |
278 | /* Certec */ |
279 | { /* Handle problems with rebooting on Certec BPC600 */ | |
280 | .callback = set_pci_reboot, | |
281 | .ident = "Certec BPC600", | |
282 | .matches = { | |
283 | DMI_MATCH(DMI_SYS_VENDOR, "Certec"), | |
284 | DMI_MATCH(DMI_PRODUCT_NAME, "BPC600"), | |
285 | }, | |
286 | }, | |
287 | ||
e56e57f6 DJ |
288 | /* Dell */ |
289 | { /* Handle problems with rebooting on Dell DXP061 */ | |
093bac15 | 290 | .callback = set_bios_reboot, |
e56e57f6 | 291 | .ident = "Dell DXP061", |
093bac15 SC |
292 | .matches = { |
293 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 294 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DXP061"), |
093bac15 SC |
295 | }, |
296 | }, | |
e56e57f6 | 297 | { /* Handle problems with rebooting on Dell E520's */ |
4a4aca64 | 298 | .callback = set_bios_reboot, |
e56e57f6 | 299 | .ident = "Dell E520", |
4a4aca64 JD |
300 | .matches = { |
301 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 302 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), |
4a4aca64 JD |
303 | }, |
304 | }, | |
986189f9 LT |
305 | { /* Handle problems with rebooting on the Latitude E5410. */ |
306 | .callback = set_pci_reboot, | |
307 | .ident = "Dell Latitude E5410", | |
35ea63d7 LO |
308 | .matches = { |
309 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
986189f9 | 310 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5410"), |
35ea63d7 LO |
311 | }, |
312 | }, | |
e56e57f6 DJ |
313 | { /* Handle problems with rebooting on the Latitude E5420. */ |
314 | .callback = set_pci_reboot, | |
315 | .ident = "Dell Latitude E5420", | |
1da177e4 | 316 | .matches = { |
35ea63d7 | 317 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 | 318 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E5420"), |
1da177e4 LT |
319 | }, |
320 | }, | |
e56e57f6 DJ |
321 | { /* Handle problems with rebooting on the Latitude E6320. */ |
322 | .callback = set_pci_reboot, | |
323 | .ident = "Dell Latitude E6320", | |
fab3b58d IM |
324 | .matches = { |
325 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 326 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6320"), |
fab3b58d IM |
327 | }, |
328 | }, | |
e56e57f6 DJ |
329 | { /* Handle problems with rebooting on the Latitude E6420. */ |
330 | .callback = set_pci_reboot, | |
331 | .ident = "Dell Latitude E6420", | |
890ffedc TB |
332 | .matches = { |
333 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 334 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6420"), |
890ffedc TB |
335 | }, |
336 | }, | |
e56e57f6 | 337 | { /* Handle problems with rebooting on Dell Optiplex 330 with 0KP561 */ |
d91b14c4 | 338 | .callback = set_bios_reboot, |
e56e57f6 | 339 | .ident = "Dell OptiPlex 330", |
d91b14c4 | 340 | .matches = { |
890ffedc | 341 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
342 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 330"), |
343 | DMI_MATCH(DMI_BOARD_NAME, "0KP561"), | |
d91b14c4 TV |
344 | }, |
345 | }, | |
e56e57f6 | 346 | { /* Handle problems with rebooting on Dell Optiplex 360 with 0T656F */ |
dd4124a8 | 347 | .callback = set_bios_reboot, |
e56e57f6 | 348 | .ident = "Dell OptiPlex 360", |
dd4124a8 LO |
349 | .matches = { |
350 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 DJ |
351 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 360"), |
352 | DMI_MATCH(DMI_BOARD_NAME, "0T656F"), | |
dd4124a8 LO |
353 | }, |
354 | }, | |
e56e57f6 | 355 | { /* Handle problems with rebooting on Dell Optiplex 745's SFF */ |
c5da9a2b | 356 | .callback = set_bios_reboot, |
e56e57f6 | 357 | .ident = "Dell OptiPlex 745", |
c5da9a2b AC |
358 | .matches = { |
359 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 360 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
c5da9a2b AC |
361 | }, |
362 | }, | |
e56e57f6 | 363 | { /* Handle problems with rebooting on Dell Optiplex 745's DFF */ |
88dff493 | 364 | .callback = set_bios_reboot, |
e56e57f6 | 365 | .ident = "Dell OptiPlex 745", |
88dff493 | 366 | .matches = { |
c5da9a2b | 367 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
e56e57f6 DJ |
368 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
369 | DMI_MATCH(DMI_BOARD_NAME, "0MM599"), | |
88dff493 ZR |
370 | }, |
371 | }, | |
e56e57f6 | 372 | { /* Handle problems with rebooting on Dell Optiplex 745 with 0KW626 */ |
4832ddda | 373 | .callback = set_bios_reboot, |
e56e57f6 | 374 | .ident = "Dell OptiPlex 745", |
b49c78d4 | 375 | .matches = { |
e56e57f6 DJ |
376 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
377 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), | |
378 | DMI_MATCH(DMI_BOARD_NAME, "0KW626"), | |
b49c78d4 PC |
379 | }, |
380 | }, | |
e56e57f6 | 381 | { /* Handle problems with rebooting on Dell OptiPlex 760 with 0G919G */ |
4832ddda | 382 | .callback = set_bios_reboot, |
e56e57f6 | 383 | .ident = "Dell OptiPlex 760", |
6c6c51e4 | 384 | .matches = { |
e56e57f6 DJ |
385 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
386 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 760"), | |
387 | DMI_MATCH(DMI_BOARD_NAME, "0G919G"), | |
6c6c51e4 PM |
388 | }, |
389 | }, | |
e56e57f6 | 390 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
498cdbfb | 391 | .callback = set_pci_reboot, |
a729691b | 392 | .ident = "Dell OptiPlex 990 BIOS A0x", |
498cdbfb | 393 | .matches = { |
e56e57f6 DJ |
394 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
395 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
a729691b | 396 | DMI_MATCH(DMI_BIOS_VERSION, "A0"), |
498cdbfb OÇ |
397 | }, |
398 | }, | |
e56e57f6 DJ |
399 | { /* Handle problems with rebooting on Dell 300's */ |
400 | .callback = set_bios_reboot, | |
401 | .ident = "Dell PowerEdge 300", | |
05154752 | 402 | .matches = { |
e56e57f6 DJ |
403 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
404 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), | |
05154752 GH |
405 | }, |
406 | }, | |
e56e57f6 DJ |
407 | { /* Handle problems with rebooting on Dell 1300's */ |
408 | .callback = set_bios_reboot, | |
409 | .ident = "Dell PowerEdge 1300", | |
0a832320 | 410 | .matches = { |
e56e57f6 DJ |
411 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
412 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), | |
0a832320 JM |
413 | }, |
414 | }, | |
e56e57f6 DJ |
415 | { /* Handle problems with rebooting on Dell 2400's */ |
416 | .callback = set_bios_reboot, | |
417 | .ident = "Dell PowerEdge 2400", | |
3628c3f5 | 418 | .matches = { |
e56e57f6 DJ |
419 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
420 | DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), | |
3628c3f5 MR |
421 | }, |
422 | }, | |
e56e57f6 | 423 | { /* Handle problems with rebooting on the Dell PowerEdge C6100. */ |
8412da75 | 424 | .callback = set_pci_reboot, |
e56e57f6 | 425 | .ident = "Dell PowerEdge C6100", |
8412da75 | 426 | .matches = { |
e56e57f6 DJ |
427 | DMI_MATCH(DMI_SYS_VENDOR, "Dell"), |
428 | DMI_MATCH(DMI_PRODUCT_NAME, "C6100"), | |
8412da75 VS |
429 | }, |
430 | }, | |
e56e57f6 | 431 | { /* Handle problems with rebooting on the Precision M6600. */ |
b7798d28 | 432 | .callback = set_pci_reboot, |
e56e57f6 | 433 | .ident = "Dell Precision M6600", |
b7798d28 DB |
434 | .matches = { |
435 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 436 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision M6600"), |
b7798d28 DB |
437 | }, |
438 | }, | |
e56e57f6 DJ |
439 | { /* Handle problems with rebooting on Dell T5400's */ |
440 | .callback = set_bios_reboot, | |
441 | .ident = "Dell Precision T5400", | |
a536877e PA |
442 | .matches = { |
443 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 444 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T5400"), |
a536877e PA |
445 | }, |
446 | }, | |
e56e57f6 DJ |
447 | { /* Handle problems with rebooting on Dell T7400's */ |
448 | .callback = set_bios_reboot, | |
449 | .ident = "Dell Precision T7400", | |
6be30bb7 RW |
450 | .matches = { |
451 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 452 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision WorkStation T7400"), |
6be30bb7 RW |
453 | }, |
454 | }, | |
e56e57f6 DJ |
455 | { /* Handle problems with rebooting on Dell XPS710 */ |
456 | .callback = set_bios_reboot, | |
457 | .ident = "Dell XPS710", | |
76eb9a30 ZR |
458 | .matches = { |
459 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
e56e57f6 | 460 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell XPS710"), |
76eb9a30 ZR |
461 | }, |
462 | }, | |
4d581259 AH |
463 | { /* Handle problems with rebooting on Dell Optiplex 7450 AIO */ |
464 | .callback = set_acpi_reboot, | |
465 | .ident = "Dell OptiPlex 7450 AIO", | |
466 | .matches = { | |
467 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
468 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7450 AIO"), | |
469 | }, | |
470 | }, | |
e56e57f6 DJ |
471 | |
472 | /* Hewlett-Packard */ | |
473 | { /* Handle problems with rebooting on HP laptops */ | |
474 | .callback = set_bios_reboot, | |
475 | .ident = "HP Compaq Laptop", | |
4f0acd31 | 476 | .matches = { |
e56e57f6 DJ |
477 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
478 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), | |
4f0acd31 MS |
479 | }, |
480 | }, | |
e56e57f6 | 481 | |
4b2d8ca9 HK |
482 | { /* PCIe Wifi card isn't detected after reboot otherwise */ |
483 | .callback = set_pci_reboot, | |
484 | .ident = "Zotac ZBOX CI327 nano", | |
485 | .matches = { | |
486 | DMI_MATCH(DMI_SYS_VENDOR, "NA"), | |
487 | DMI_MATCH(DMI_PRODUCT_NAME, "ZBOX-CI327NANO-GS-01"), | |
488 | }, | |
489 | }, | |
490 | ||
e56e57f6 DJ |
491 | /* Sony */ |
492 | { /* Handle problems with rebooting on Sony VGN-Z540N */ | |
493 | .callback = set_bios_reboot, | |
494 | .ident = "Sony VGN-Z540N", | |
4f0acd31 | 495 | .matches = { |
e56e57f6 DJ |
496 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
497 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-Z540N"), | |
4f0acd31 MS |
498 | }, |
499 | }, | |
e76be3f9 LO |
500 | { /* Handle problems with rebooting on the Latitude E6520. */ |
501 | .callback = set_pci_reboot, | |
502 | .ident = "Dell Latitude E6520", | |
503 | .matches = { | |
504 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
505 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6520"), | |
506 | }, | |
507 | }, | |
01dc0f7c LO |
508 | { /* Handle problems with rebooting on the OptiPlex 790. */ |
509 | .callback = set_pci_reboot, | |
510 | .ident = "Dell OptiPlex 790", | |
511 | .matches = { | |
512 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
513 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 790"), | |
514 | }, | |
515 | }, | |
43c22527 LO |
516 | { /* Handle problems with rebooting on the OptiPlex 990. */ |
517 | .callback = set_pci_reboot, | |
518 | .ident = "Dell OptiPlex 990", | |
519 | .matches = { | |
520 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
521 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 990"), | |
522 | }, | |
523 | }, | |
17e47644 LO |
524 | { /* Handle problems with rebooting on the Latitude E6220. */ |
525 | .callback = set_pci_reboot, | |
526 | .ident = "Dell Latitude E6220", | |
527 | .matches = { | |
528 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
529 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6220"), | |
530 | }, | |
531 | }, | |
341cdfbb | 532 | { /* Handle problems with rebooting on the OptiPlex 390. */ |
533 | .callback = set_pci_reboot, | |
534 | .ident = "Dell OptiPlex 390", | |
535 | .matches = { | |
536 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
537 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 390"), | |
538 | }, | |
539 | }, | |
6c6c51e4 PM |
540 | { } |
541 | }; | |
542 | ||
57b16594 | 543 | static int __init reboot_init(void) |
6c6c51e4 | 544 | { |
44be28e9 MF |
545 | int rv; |
546 | ||
144d102b ML |
547 | /* |
548 | * Only do the DMI check if reboot_type hasn't been overridden | |
5955633e ML |
549 | * on the command line |
550 | */ | |
44be28e9 MF |
551 | if (!reboot_default) |
552 | return 0; | |
553 | ||
554 | /* | |
555 | * The DMI quirks table takes precedence. If no quirks entry | |
4ecf7191 SA |
556 | * matches and the ACPI Hardware Reduced bit is set and EFI |
557 | * runtime services are enabled, force EFI reboot. | |
44be28e9 MF |
558 | */ |
559 | rv = dmi_check_system(reboot_dmi_table); | |
560 | ||
4ecf7191 | 561 | if (!rv && efi_reboot_required() && !efi_runtime_disabled()) |
44be28e9 MF |
562 | reboot_type = BOOT_EFI; |
563 | ||
6c6c51e4 PM |
564 | return 0; |
565 | } | |
57b16594 | 566 | core_initcall(reboot_init); |
6c6c51e4 | 567 | |
4d022e35 MB |
568 | static inline void kb_wait(void) |
569 | { | |
570 | int i; | |
571 | ||
c84d6af8 AC |
572 | for (i = 0; i < 0x10000; i++) { |
573 | if ((inb(0x64) & 0x02) == 0) | |
4d022e35 | 574 | break; |
c84d6af8 AC |
575 | udelay(2); |
576 | } | |
4d022e35 MB |
577 | } |
578 | ||
9c48f1c6 | 579 | static void vmxoff_nmi(int cpu, struct pt_regs *regs) |
d176720d EH |
580 | { |
581 | cpu_emergency_vmxoff(); | |
582 | } | |
583 | ||
144d102b | 584 | /* Use NMIs as IPIs to tell all CPUs to disable virtualization */ |
d176720d EH |
585 | static void emergency_vmx_disable_all(void) |
586 | { | |
587 | /* Just make sure we won't change CPUs while doing this */ | |
588 | local_irq_disable(); | |
589 | ||
144d102b | 590 | /* |
ed727361 SC |
591 | * Disable VMX on all CPUs before rebooting, otherwise we risk hanging |
592 | * the machine, because the CPU blocks INIT when it's in VMX root. | |
d176720d | 593 | * |
ed727361 SC |
594 | * We can't take any locks and we may be on an inconsistent state, so |
595 | * use NMIs as IPIs to tell the other CPUs to exit VMX root and halt. | |
d176720d | 596 | * |
ed727361 SC |
597 | * Do the NMI shootdown even if VMX if off on _this_ CPU, as that |
598 | * doesn't prevent a different CPU from being in VMX root operation. | |
d176720d | 599 | */ |
ed727361 SC |
600 | if (cpu_has_vmx()) { |
601 | /* Safely force _this_ CPU out of VMX root operation. */ | |
602 | __cpu_emergency_vmxoff(); | |
d176720d | 603 | |
ed727361 | 604 | /* Halt and exit VMX root operation on the other CPUs. */ |
d176720d | 605 | nmi_shootdown_cpus(vmxoff_nmi); |
d176720d EH |
606 | } |
607 | } | |
608 | ||
609 | ||
7432d149 IM |
610 | void __attribute__((weak)) mach_reboot_fixups(void) |
611 | { | |
612 | } | |
613 | ||
660e34ce | 614 | /* |
5be44a6f IM |
615 | * To the best of our knowledge Windows compatible x86 hardware expects |
616 | * the following on reboot: | |
660e34ce MG |
617 | * |
618 | * 1) If the FADT has the ACPI reboot register flag set, try it | |
619 | * 2) If still alive, write to the keyboard controller | |
620 | * 3) If still alive, write to the ACPI reboot register again | |
621 | * 4) If still alive, write to the keyboard controller again | |
a4f1987e | 622 | * 5) If still alive, call the EFI runtime service to reboot |
5be44a6f | 623 | * 6) If no EFI runtime service, call the BIOS to do a reboot |
660e34ce | 624 | * |
5be44a6f IM |
625 | * We default to following the same pattern. We also have |
626 | * two other reboot methods: 'triple fault' and 'PCI', which | |
627 | * can be triggered via the reboot= kernel boot option or | |
628 | * via quirks. | |
629 | * | |
630 | * This means that this function can never return, it can misbehave | |
631 | * by not rebooting properly and hanging. | |
660e34ce | 632 | */ |
416e2d63 | 633 | static void native_machine_emergency_restart(void) |
1da177e4 | 634 | { |
4d022e35 | 635 | int i; |
660e34ce MG |
636 | int attempt = 0; |
637 | int orig_reboot_type = reboot_type; | |
edf2b139 | 638 | unsigned short mode; |
4d022e35 | 639 | |
d176720d EH |
640 | if (reboot_emergency) |
641 | emergency_vmx_disable_all(); | |
642 | ||
840c2baf JC |
643 | tboot_shutdown(TB_SHUTDOWN_REBOOT); |
644 | ||
4d022e35 | 645 | /* Tell the BIOS if we want cold or warm reboot */ |
edf2b139 RH |
646 | mode = reboot_mode == REBOOT_WARM ? 0x1234 : 0; |
647 | *((unsigned short *)__va(0x472)) = mode; | |
4d022e35 | 648 | |
87615a34 MF |
649 | /* |
650 | * If an EFI capsule has been registered with the firmware then | |
651 | * override the reboot= parameter. | |
652 | */ | |
653 | if (efi_capsule_pending(NULL)) { | |
654 | pr_info("EFI capsule is pending, forcing EFI reboot.\n"); | |
655 | reboot_type = BOOT_EFI; | |
656 | } | |
657 | ||
4d022e35 MB |
658 | for (;;) { |
659 | /* Could also try the reset bit in the Hammer NB */ | |
660 | switch (reboot_type) { | |
5be44a6f IM |
661 | case BOOT_ACPI: |
662 | acpi_reboot(); | |
663 | reboot_type = BOOT_KBD; | |
664 | break; | |
665 | ||
4d022e35 | 666 | case BOOT_KBD: |
144d102b | 667 | mach_reboot_fixups(); /* For board specific fixups */ |
7432d149 | 668 | |
4d022e35 MB |
669 | for (i = 0; i < 10; i++) { |
670 | kb_wait(); | |
671 | udelay(50); | |
144d102b | 672 | outb(0xfe, 0x64); /* Pulse reset low */ |
4d022e35 MB |
673 | udelay(50); |
674 | } | |
660e34ce MG |
675 | if (attempt == 0 && orig_reboot_type == BOOT_ACPI) { |
676 | attempt = 1; | |
677 | reboot_type = BOOT_ACPI; | |
678 | } else { | |
a4f1987e | 679 | reboot_type = BOOT_EFI; |
660e34ce MG |
680 | } |
681 | break; | |
4d022e35 | 682 | |
4d022e35 | 683 | case BOOT_EFI: |
8562c99c | 684 | efi_reboot(reboot_mode, NULL); |
5be44a6f IM |
685 | reboot_type = BOOT_BIOS; |
686 | break; | |
687 | ||
688 | case BOOT_BIOS: | |
689 | machine_real_restart(MRR_BIOS); | |
690 | ||
691 | /* We're probably dead after this, but... */ | |
692 | reboot_type = BOOT_CF9_SAFE; | |
14d7ca5c | 693 | break; |
4d022e35 | 694 | |
5be44a6f | 695 | case BOOT_CF9_FORCE: |
14d7ca5c | 696 | port_cf9_safe = true; |
df561f66 | 697 | fallthrough; |
4d022e35 | 698 | |
5be44a6f | 699 | case BOOT_CF9_SAFE: |
14d7ca5c | 700 | if (port_cf9_safe) { |
5be44a6f | 701 | u8 reboot_code = reboot_mode == REBOOT_WARM ? 0x06 : 0x0E; |
16c21ae5 | 702 | u8 cf9 = inb(0xcf9) & ~reboot_code; |
14d7ca5c PA |
703 | outb(cf9|2, 0xcf9); /* Request hard reset */ |
704 | udelay(50); | |
16c21ae5 LF |
705 | /* Actually do the reset */ |
706 | outb(cf9|reboot_code, 0xcf9); | |
14d7ca5c PA |
707 | udelay(50); |
708 | } | |
5be44a6f IM |
709 | reboot_type = BOOT_TRIPLE; |
710 | break; | |
711 | ||
712 | case BOOT_TRIPLE: | |
8ec9069a | 713 | idt_invalidate(); |
5be44a6f IM |
714 | __asm__ __volatile__("int3"); |
715 | ||
716 | /* We're probably dead after this, but... */ | |
717 | reboot_type = BOOT_KBD; | |
4d022e35 MB |
718 | break; |
719 | } | |
720 | } | |
721 | } | |
722 | ||
3c62c625 | 723 | void native_machine_shutdown(void) |
4d022e35 MB |
724 | { |
725 | /* Stop the cpus and apics */ | |
522e6646 | 726 | #ifdef CONFIG_X86_IO_APIC |
2885432a FY |
727 | /* |
728 | * Disabling IO APIC before local APIC is a workaround for | |
729 | * erratum AVR31 in "Intel Atom Processor C2000 Product Family | |
730 | * Specification Update". In this situation, interrupts that target | |
731 | * a Logical Processor whose Local APIC is either in the process of | |
732 | * being hardware disabled or software disabled are neither delivered | |
733 | * nor discarded. When this erratum occurs, the processor may hang. | |
734 | * | |
735 | * Even without the erratum, it still makes sense to quiet IO APIC | |
736 | * before disabling Local APIC. | |
737 | */ | |
339b2ae0 | 738 | clear_IO_APIC(); |
522e6646 FY |
739 | #endif |
740 | ||
1da177e4 | 741 | #ifdef CONFIG_SMP |
144d102b | 742 | /* |
1b3a5d02 RH |
743 | * Stop all of the others. Also disable the local irq to |
744 | * not receive the per-cpu timer interrupt which may trigger | |
745 | * scheduler's load balance. | |
1da177e4 | 746 | */ |
55c844a4 | 747 | local_irq_disable(); |
76fac077 | 748 | stop_other_cpus(); |
4d022e35 | 749 | #endif |
1da177e4 LT |
750 | |
751 | lapic_shutdown(); | |
339b2ae0 | 752 | restore_boot_irq_mode(); |
1da177e4 | 753 | |
c86c7fbc OH |
754 | #ifdef CONFIG_HPET_TIMER |
755 | hpet_disable(); | |
756 | #endif | |
dd2a1305 | 757 | |
4d022e35 | 758 | #ifdef CONFIG_X86_64 |
338bac52 | 759 | x86_platform.iommu_shutdown(); |
4d022e35 | 760 | #endif |
973efae2 JF |
761 | } |
762 | ||
d176720d EH |
763 | static void __machine_emergency_restart(int emergency) |
764 | { | |
765 | reboot_emergency = emergency; | |
766 | machine_ops.emergency_restart(); | |
767 | } | |
768 | ||
416e2d63 | 769 | static void native_machine_restart(char *__unused) |
dd2a1305 | 770 | { |
c767a54b | 771 | pr_notice("machine restart\n"); |
1da177e4 | 772 | |
4d022e35 MB |
773 | if (!reboot_force) |
774 | machine_shutdown(); | |
d176720d | 775 | __machine_emergency_restart(0); |
4a1421f8 EB |
776 | } |
777 | ||
416e2d63 | 778 | static void native_machine_halt(void) |
1da177e4 | 779 | { |
144d102b | 780 | /* Stop other cpus and apics */ |
d3ec5cae IV |
781 | machine_shutdown(); |
782 | ||
840c2baf JC |
783 | tboot_shutdown(TB_SHUTDOWN_HALT); |
784 | ||
d3ec5cae | 785 | stop_this_cpu(NULL); |
1da177e4 LT |
786 | } |
787 | ||
416e2d63 | 788 | static void native_machine_power_off(void) |
1da177e4 | 789 | { |
6e3fbee5 | 790 | if (pm_power_off) { |
4d022e35 MB |
791 | if (!reboot_force) |
792 | machine_shutdown(); | |
1da177e4 | 793 | pm_power_off(); |
6e3fbee5 | 794 | } |
144d102b | 795 | /* A fallback in case there is no PM info available */ |
840c2baf | 796 | tboot_shutdown(TB_SHUTDOWN_HALT); |
1da177e4 LT |
797 | } |
798 | ||
404f6aac | 799 | struct machine_ops machine_ops __ro_after_init = { |
416e2d63 JB |
800 | .power_off = native_machine_power_off, |
801 | .shutdown = native_machine_shutdown, | |
802 | .emergency_restart = native_machine_emergency_restart, | |
803 | .restart = native_machine_restart, | |
ed23dc6f | 804 | .halt = native_machine_halt, |
2965faa5 | 805 | #ifdef CONFIG_KEXEC_CORE |
ed23dc6f GC |
806 | .crash_shutdown = native_machine_crash_shutdown, |
807 | #endif | |
07f3331c | 808 | }; |
416e2d63 JB |
809 | |
810 | void machine_power_off(void) | |
811 | { | |
812 | machine_ops.power_off(); | |
813 | } | |
814 | ||
815 | void machine_shutdown(void) | |
816 | { | |
817 | machine_ops.shutdown(); | |
818 | } | |
819 | ||
820 | void machine_emergency_restart(void) | |
821 | { | |
d176720d | 822 | __machine_emergency_restart(1); |
416e2d63 JB |
823 | } |
824 | ||
825 | void machine_restart(char *cmd) | |
826 | { | |
827 | machine_ops.restart(cmd); | |
828 | } | |
829 | ||
830 | void machine_halt(void) | |
831 | { | |
832 | machine_ops.halt(); | |
833 | } | |
834 | ||
2965faa5 | 835 | #ifdef CONFIG_KEXEC_CORE |
ed23dc6f GC |
836 | void machine_crash_shutdown(struct pt_regs *regs) |
837 | { | |
838 | machine_ops.crash_shutdown(regs); | |
839 | } | |
840 | #endif | |
2ddded21 EH |
841 | |
842 | ||
5bc32950 XP |
843 | /* This is the CPU performing the emergency shutdown work. */ |
844 | int crashing_cpu = -1; | |
845 | ||
bb8dd270 | 846 | #if defined(CONFIG_SMP) |
2ddded21 | 847 | |
2ddded21 EH |
848 | static nmi_shootdown_cb shootdown_callback; |
849 | ||
850 | static atomic_t waiting_for_crash_ipi; | |
58c5661f | 851 | static int crash_ipi_issued; |
2ddded21 | 852 | |
9c48f1c6 | 853 | static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) |
2ddded21 EH |
854 | { |
855 | int cpu; | |
856 | ||
2ddded21 EH |
857 | cpu = raw_smp_processor_id(); |
858 | ||
144d102b ML |
859 | /* |
860 | * Don't do anything if this handler is invoked on crashing cpu. | |
2ddded21 EH |
861 | * Otherwise, system will completely hang. Crashing cpu can get |
862 | * an NMI if system was initially booted with nmi_watchdog parameter. | |
863 | */ | |
864 | if (cpu == crashing_cpu) | |
9c48f1c6 | 865 | return NMI_HANDLED; |
2ddded21 EH |
866 | local_irq_disable(); |
867 | ||
9c48f1c6 | 868 | shootdown_callback(cpu, regs); |
2ddded21 EH |
869 | |
870 | atomic_dec(&waiting_for_crash_ipi); | |
871 | /* Assume hlt works */ | |
872 | halt(); | |
873 | for (;;) | |
874 | cpu_relax(); | |
875 | ||
9c48f1c6 | 876 | return NMI_HANDLED; |
2ddded21 EH |
877 | } |
878 | ||
144d102b ML |
879 | /* |
880 | * Halt all other CPUs, calling the specified function on each of them | |
bb8dd270 EH |
881 | * |
882 | * This function can be used to halt all other CPUs on crash | |
883 | * or emergency reboot time. The function passed as parameter | |
884 | * will be called inside a NMI handler on all CPUs. | |
885 | */ | |
2ddded21 EH |
886 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) |
887 | { | |
888 | unsigned long msecs; | |
c415b3dc | 889 | local_irq_disable(); |
2ddded21 | 890 | |
144d102b | 891 | /* Make a note of crashing cpu. Will be used in NMI callback. */ |
2ddded21 EH |
892 | crashing_cpu = safe_smp_processor_id(); |
893 | ||
894 | shootdown_callback = callback; | |
895 | ||
896 | atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1); | |
897 | /* Would it be better to replace the trap vector here? */ | |
9c48f1c6 DZ |
898 | if (register_nmi_handler(NMI_LOCAL, crash_nmi_callback, |
899 | NMI_FLAG_FIRST, "crash")) | |
144d102b ML |
900 | return; /* Return what? */ |
901 | /* | |
902 | * Ensure the new callback function is set before sending | |
2ddded21 EH |
903 | * out the NMI |
904 | */ | |
905 | wmb(); | |
906 | ||
22ca7ee9 | 907 | apic_send_IPI_allbutself(NMI_VECTOR); |
2ddded21 | 908 | |
58c5661f HK |
909 | /* Kick CPUs looping in NMI context. */ |
910 | WRITE_ONCE(crash_ipi_issued, 1); | |
911 | ||
2ddded21 EH |
912 | msecs = 1000; /* Wait at most a second for the other cpus to stop */ |
913 | while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { | |
914 | mdelay(1); | |
915 | msecs--; | |
916 | } | |
917 | ||
918 | /* Leave the nmi callback set */ | |
919 | } | |
58c5661f | 920 | |
b279d67d HK |
921 | /* |
922 | * Check if the crash dumping IPI got issued and if so, call its callback | |
923 | * directly. This function is used when we have already been in NMI handler. | |
924 | * It doesn't return. | |
925 | */ | |
926 | void run_crash_ipi_callback(struct pt_regs *regs) | |
927 | { | |
928 | if (crash_ipi_issued) | |
929 | crash_nmi_callback(0, regs); | |
930 | } | |
931 | ||
58c5661f HK |
932 | /* Override the weak function in kernel/panic.c */ |
933 | void nmi_panic_self_stop(struct pt_regs *regs) | |
934 | { | |
935 | while (1) { | |
b279d67d HK |
936 | /* If no CPU is preparing crash dump, we simply loop here. */ |
937 | run_crash_ipi_callback(regs); | |
58c5661f HK |
938 | cpu_relax(); |
939 | } | |
940 | } | |
941 | ||
bb8dd270 EH |
942 | #else /* !CONFIG_SMP */ |
943 | void nmi_shootdown_cpus(nmi_shootdown_cb callback) | |
944 | { | |
945 | /* No other CPUs to shoot down */ | |
946 | } | |
b279d67d HK |
947 | |
948 | void run_crash_ipi_callback(struct pt_regs *regs) | |
949 | { | |
950 | } | |
2ddded21 | 951 | #endif |