1/*
2 * Copyright (c) 2000
3 * John Baldwin <jhb@FreeBSD.org>. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY JOHN BALDWIN AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL JOHN BALDWIN OR THE VOICES IN HIS HEAD
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: head/sys/kern/kern_ktr.c 69880 2000-12-12 00:43:50Z jhb $
30 */
31
32/*
33 * This module holds the global variables used by KTR and the ktr_tracepoint()
34 * function that does the actual tracing.
35 */
36
37#include "opt_ktr.h"
38
39#include <sys/types.h>
40#include <sys/time.h>
41#include <sys/ktr.h>
42#include <sys/libkern.h>
43#include <sys/linker_set.h>
44#include <sys/sysctl.h>
45#include <sys/systm.h>
46#include <machine/globals.h>
47#include <machine/stdarg.h>
48
49#ifndef KTR_MASK
50#define KTR_MASK (KTR_GEN)
51#endif
52
53#ifndef KTR_CPUMASK
54#define KTR_CPUMASK (~0)
55#endif
56
57#ifdef SMP
58#define KTR_CPU cpuid
59#else
60#define KTR_CPU 0
61#endif
62
63#ifdef KTR_EXTEND
64/*
65 * This variable is used only by gdb to work out what fields are in
66 * ktr_entry.
67 */
68int ktr_extend = 1;
69SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, "");
70#else
71int ktr_extend = 0;
72SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, "");
73#endif /* KTR_EXTEND */
74
75int ktr_cpumask = KTR_CPUMASK;
76SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, "");
77
78int ktr_mask = KTR_MASK;
79SYSCTL_INT(_debug, OID_AUTO, ktr_mask, CTLFLAG_RW, &ktr_mask, KTR_MASK, "");
80
81int ktr_entries = KTR_ENTRIES;
82SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES, "");
83
84volatile int ktr_idx = 0;
85struct ktr_entry ktr_buf[KTR_ENTRIES];
86
87#ifdef KTR_VERBOSE
88int ktr_verbose = 1;
89#else
90int ktr_verbose = 0;
91#endif
92SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
93
94#ifdef KTR
95#ifdef KTR_EXTEND
96void
97ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...)
98#else
99void
100ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3,
101 u_long arg4, u_long arg5)
102#endif
103{
104 struct ktr_entry *entry;
105 int newindex, saveindex, saveintr;
106#ifdef KTR_EXTEND
107 va_list ap;
108#endif
109
110 if (panicstr)
111 return;
112 if ((ktr_mask & mask) == 0)
113 return;
114#ifdef KTR_EXTEND
115 if (((1 << KTR_CPU) & ktr_cpumask) == 0)
116 return;
117#endif
118 saveintr = save_intr();
119 disable_intr();
120 do {
121 saveindex = ktr_idx;
122 newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
123 } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
124 entry = &ktr_buf[saveindex];
125 restore_intr(saveintr);
126 getnanotime(&entry->ktr_tv);
127#ifdef KTR_EXTEND
128 strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1);
129 entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0';
130 entry->ktr_line = line;
131 entry->ktr_cpu = KTR_CPU;
132 va_start(ap, format);
133 vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
134 va_end(ap);
135 if (ktr_verbose) {
136#ifdef SMP
137 printf("cpu%d ", entry->ktr_cpu);
138#endif
139 if (ktr_verbose > 1)
140 printf("%s.%d\t", entry->ktr_filename, entry->ktr_line);
141 va_start(ap, format);
142 vprintf(format, ap);
143 printf("\n");
144 va_end(ap);
145 }
146#else
147 entry->ktr_desc = format;
148 entry->ktr_parm1 = arg1;
149 entry->ktr_parm2 = arg2;
150 entry->ktr_parm3 = arg3;
151 entry->ktr_parm4 = arg4;
152 entry->ktr_parm5 = arg5;
153#endif
154}
155#endif /* KTR */