1 /*
2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3  *  Copyright (C) 2007 The Regents of the University of California.
4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
6  *  UCRL-CODE-235197
7  *
8  *  This file is part of the SPL, Solaris Porting Layer.
9  *
10  *  The SPL is free software; you can redistribute it and/or modify it
11  *  under the terms of the GNU General Public License as published by the
12  *  Free Software Foundation; either version 2 of the License, or (at your
13  *  option) any later version.
14  *
15  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
16  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
18  *  for more details.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
22  *
23  *  Solaris Porting Layer (SPL) Error Implementation.
24  */
25 
26 #include <sys/sysmacros.h>
27 #include <sys/cmn_err.h>
28 
29 /*
30  * It is often useful to actually have the panic crash the node so you
31  * can then get notified of the event, get the crashdump for later
32  * analysis and other such goodies.
33  * But we would still default to the current default of not to do that.
34  */
35 unsigned int spl_panic_halt;
36 /* CSTYLED */
37 module_param(spl_panic_halt, uint, 0644);
38 MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
39 
40 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
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
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
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