1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
4 * Copyright (C) 2007 The Regents of the University of California.
5 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
6 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
7 * UCRL-CODE-235197
8 *
9 * This file is part of the SPL, Solaris Porting Layer.
10 *
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 *
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 * for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
23 *
24 * Solaris Porting Layer (SPL) Error Implementation.
25 */
26
27 #include <sys/sysmacros.h>
28 #include <sys/cmn_err.h>
29
30 /*
31 * It is often useful to actually have the panic crash the node so you
32 * can then get notified of the event, get the crashdump for later
33 * analysis and other such goodies.
34 * But we would still default to the current default of not to do that.
35 */
36 static unsigned int spl_panic_halt;
37 module_param(spl_panic_halt, uint, 0644);
38 MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
39
40 void
spl_dumpstack(void)41 spl_dumpstack(void)
42 {
43 printk("Showing stack for process %d\n", current->pid);
44 dump_stack();
45 }
46 EXPORT_SYMBOL(spl_dumpstack);
47
48 void
spl_panic(const char * file,const char * func,int line,const char * fmt,...)49 spl_panic(const char *file, const char *func, int line, const char *fmt, ...)
50 {
51 const char *newfile;
52 char msg[MAXMSGLEN];
53 va_list ap;
54
55 newfile = strrchr(file, '/');
56 if (newfile != NULL)
57 newfile = newfile + 1;
58 else
59 newfile = file;
60
61 va_start(ap, fmt);
62 (void) vsnprintf(msg, sizeof (msg), fmt, ap);
63 va_end(ap);
64
65 printk(KERN_EMERG "%s", msg);
66 printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func);
67 if (spl_panic_halt)
68 panic("%s", msg);
69
70 spl_dumpstack();
71
72 /* Halt the thread to facilitate further debugging */
73 set_current_state(TASK_UNINTERRUPTIBLE);
74 while (1)
75 schedule();
76
77 /* Unreachable */
78 }
79 EXPORT_SYMBOL(spl_panic);
80
81 void
vcmn_err(int ce,const char * fmt,va_list ap)82 vcmn_err(int ce, const char *fmt, va_list ap)
83 {
84 char msg[MAXMSGLEN];
85
86 vsnprintf(msg, MAXMSGLEN, fmt, ap);
87
88 switch (ce) {
89 case CE_IGNORE:
90 break;
91 case CE_CONT:
92 printk("%s", msg);
93 break;
94 case CE_NOTE:
95 printk(KERN_NOTICE "NOTICE: %s\n", msg);
96 break;
97 case CE_WARN:
98 printk(KERN_WARNING "WARNING: %s\n", msg);
99 break;
100 case CE_PANIC:
101 printk(KERN_EMERG "PANIC: %s\n", msg);
102 if (spl_panic_halt)
103 panic("%s", msg);
104
105 spl_dumpstack();
106
107 /* Halt the thread to facilitate further debugging */
108 set_current_state(TASK_UNINTERRUPTIBLE);
109 while (1)
110 schedule();
111 }
112 } /* vcmn_err() */
113 EXPORT_SYMBOL(vcmn_err);
114
115 void
cmn_err(int ce,const char * fmt,...)116 cmn_err(int ce, const char *fmt, ...)
117 {
118 va_list ap;
119
120 va_start(ap, fmt);
121 vcmn_err(ce, fmt, ap);
122 va_end(ap);
123 } /* cmn_err() */
124 EXPORT_SYMBOL(cmn_err);
125