2 * Copyright (c) 2004 Eirik Nygaard <eirikn@kerneled.com>
4 * Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the author nor the names of any co-contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * This module holds the global variables used by KTR and the ktr_tracepoint()
34 * function that does the actual tracing.
38 * $FreeBSD: /repoman/r/ncvs/src/sys/kern/kern_ktr.c,v 1.43 2003/09/10 01:09:32 jhb Exp $
39 * $DragonFly: src/sys/kern/kern_ktr.c,v 1.1 2004/09/20 20:38:17 eirikn Exp $
45 #include <sys/param.h>
47 #include <sys/kernel.h>
49 #include <sys/libkern.h>
51 #include <sys/sysctl.h>
52 #include <sys/systm.h>
55 #include <machine/cpu.h>
56 #include <machine/cpufunc.h>
57 #include <machine/specialreg.h>
58 #include <machine/md_var.h>
63 #define KTR_ENTRIES 1024
67 #define KTR_MASK (KTR_ALL)
71 #define KTR_CPUMASK (~0)
75 #define KTR_TIME ktr_getts()
79 #define KTR_CPU mycpu->gd_cpuid;
82 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
84 int ktr_cpumask = KTR_CPUMASK;
85 TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
86 SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
88 int ktr_mask = KTR_MASK;
89 TUNABLE_INT("debug.ktr.mask", &ktr_mask);
90 SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, "");
92 int ktr_entries = KTR_ENTRIES;
93 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
95 int ktr_version = KTR_VERSION;
96 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, "");
98 volatile int ktr_idx = 0;
99 struct ktr_entry ktr_buf[KTR_ENTRIES];
100 struct lwkt_token ktr_token;
103 int ktr_verbose = KTR_VERBOSE;
104 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
105 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
109 ktr_sysinit(void *dummy)
111 lwkt_token_init(&ktr_token);
113 SYSINIT(announce, SI_SUB_INTRINSIC, SI_ORDER_FIRST, ktr_sysinit, NULL);
120 lwkt_gettoken(&ilock, &ktr_token);
121 ktr_idx = (ktr_idx + 1) & (KTR_ENTRIES - 1);
122 lwkt_reltoken(&ilock);
127 static __inline uint64_t
130 struct globaldata *gd = curthread->td_gd;
131 if (cpu_feature & CPUID_TSC)
133 return(gd->gd_time_seconds + basetime.tv_sec);
137 ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
138 u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
141 struct ktr_entry *entry;
146 if ((ktr_mask & mask) == 0)
149 if (((1 << cpu) & ktr_cpumask) == 0)
151 newindex = ktr_nextindex();
152 entry = &ktr_buf[newindex];
153 entry->ktr_timestamp = KTR_TIME;
154 entry->ktr_cpu = cpu;
156 while (strncmp(file, "../", 3) == 0)
158 entry->ktr_file = file;
159 entry->ktr_line = line;
163 printf("cpu%d ", cpu);
165 if (ktr_verbose > 1) {
166 printf("%s.%d\t", entry->ktr_file,
169 printf(format, arg1, arg2, arg3, arg4, arg5, arg6);
173 entry->ktr_desc = format;
174 entry->ktr_parms[0] = arg1;
175 entry->ktr_parms[1] = arg2;
176 entry->ktr_parms[2] = arg3;
177 entry->ktr_parms[3] = arg4;
178 entry->ktr_parms[4] = arg5;
179 entry->ktr_parms[5] = arg6;
184 #define db_more_ktr(x) \
186 if (nl > NUM_LINES_PER_PAGE) \
193 static struct tstate tstate;
194 static int db_ktr_verbose;
195 static int db_mach_vtrace(void);
197 #define NUM_LINES_PER_PAGE 18
199 DB_SHOW_COMMAND(ktr, db_ktr_all)
203 tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1);
205 if (strcmp(modif, "v") == 0)
209 if (strcmp(modif, "a") == 0) {
210 while (cncheckc() != -1) {
212 if (db_mach_vtrace() == 0)
218 if (db_mach_vtrace() == 0)
227 struct ktr_entry *kp;
229 if (tstate.cur == tstate.first) {
230 db_printf("--- End of trace buffer ---\n");
233 kp = &ktr_buf[tstate.cur];
235 /* Skip over unused entries. */
236 if (kp->ktr_desc == NULL) {
237 db_printf("--- End of trace buffer ---\n");
240 db_printf("%d: ", tstate.cur);
242 db_printf("cpu%d ", kp->ktr_cpu);
244 if (db_ktr_verbose) {
245 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp,
246 kp->ktr_file, kp->ktr_line);
248 db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1],
249 kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4],
253 if (tstate.first == -1)
254 tstate.first = tstate.cur;
256 if (--tstate.cur < 0)
257 tstate.cur = KTR_ENTRIES - 1;