xref: /openbmc/linux/include/linux/panic.h (revision d9cdb431)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PANIC_H
3 #define _LINUX_PANIC_H
4 
5 #include <linux/compiler_attributes.h>
6 #include <linux/types.h>
7 
8 struct pt_regs;
9 
10 extern long (*panic_blink)(int state);
11 __printf(1, 2)
12 void panic(const char *fmt, ...) __noreturn __cold;
13 void nmi_panic(struct pt_regs *regs, const char *msg);
14 void check_panic_on_warn(const char *origin);
15 extern void oops_enter(void);
16 extern void oops_exit(void);
17 extern bool oops_may_print(void);
18 
19 extern int panic_timeout;
20 extern unsigned long panic_print;
21 extern int panic_on_oops;
22 extern int panic_on_unrecovered_nmi;
23 extern int panic_on_io_nmi;
24 extern int panic_on_warn;
25 
26 extern unsigned long panic_on_taint;
27 extern bool panic_on_taint_nousertaint;
28 
29 extern int sysctl_panic_on_rcu_stall;
30 extern int sysctl_max_rcu_stall_to_panic;
31 extern int sysctl_panic_on_stackoverflow;
32 
33 extern bool crash_kexec_post_notifiers;
34 
35 extern void __stack_chk_fail(void);
36 void abort(void);
37 
38 /*
39  * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
40  * holds a CPU number which is executing panic() currently. A value of
41  * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec().
42  */
43 extern atomic_t panic_cpu;
44 #define PANIC_CPU_INVALID	-1
45 
46 /*
47  * Only to be used by arch init code. If the user over-wrote the default
48  * CONFIG_PANIC_TIMEOUT, honor it.
49  */
set_arch_panic_timeout(int timeout,int arch_default_timeout)50 static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
51 {
52 	if (panic_timeout == arch_default_timeout)
53 		panic_timeout = timeout;
54 }
55 
56 /* This cannot be an enum because some may be used in assembly source. */
57 #define TAINT_PROPRIETARY_MODULE	0
58 #define TAINT_FORCED_MODULE		1
59 #define TAINT_CPU_OUT_OF_SPEC		2
60 #define TAINT_FORCED_RMMOD		3
61 #define TAINT_MACHINE_CHECK		4
62 #define TAINT_BAD_PAGE			5
63 #define TAINT_USER			6
64 #define TAINT_DIE			7
65 #define TAINT_OVERRIDDEN_ACPI_TABLE	8
66 #define TAINT_WARN			9
67 #define TAINT_CRAP			10
68 #define TAINT_FIRMWARE_WORKAROUND	11
69 #define TAINT_OOT_MODULE		12
70 #define TAINT_UNSIGNED_MODULE		13
71 #define TAINT_SOFTLOCKUP		14
72 #define TAINT_LIVEPATCH			15
73 #define TAINT_AUX			16
74 #define TAINT_RANDSTRUCT		17
75 #define TAINT_TEST			18
76 #define TAINT_FLAGS_COUNT		19
77 #define TAINT_FLAGS_MAX			((1UL << TAINT_FLAGS_COUNT) - 1)
78 
79 struct taint_flag {
80 	char c_true;	/* character printed when tainted */
81 	char c_false;	/* character printed when not tainted */
82 	bool module;	/* also show as a per-module taint flag */
83 };
84 
85 extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT];
86 
87 enum lockdep_ok {
88 	LOCKDEP_STILL_OK,
89 	LOCKDEP_NOW_UNRELIABLE,
90 };
91 
92 extern const char *print_tainted(void);
93 extern void add_taint(unsigned flag, enum lockdep_ok);
94 extern int test_taint(unsigned flag);
95 extern unsigned long get_taint(void);
96 
97 #endif	/* _LINUX_PANIC_H */
98