2 * Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 3. 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.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * This module holds the global variables used by KTR and the ktr_tracepoint()
32 * function that does the actual tracing.
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
45 #include <sys/kernel.h>
47 #include <sys/libkern.h>
49 #include <sys/sysctl.h>
50 #include <sys/systm.h>
53 #include <machine/cpu.h>
55 #include <machine/ktr.h>
60 #include <ddb/db_output.h>
64 #define KTR_ENTRIES 1024
72 #define KTR_CPUMASK (~0)
76 #define KTR_TIME get_cyclecount()
80 #define KTR_CPU PCPU_GET(cpuid)
83 FEATURE(ktr, "Kernel support for KTR kernel tracing facility");
85 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
87 int ktr_cpumask = KTR_CPUMASK;
88 TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
89 SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW,
90 &ktr_cpumask, 0, "Bitmask of CPUs on which KTR logging is enabled");
92 int ktr_mask = KTR_MASK;
93 TUNABLE_INT("debug.ktr.mask", &ktr_mask);
94 SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW,
95 &ktr_mask, 0, "Bitmask of KTR event classes for which logging is enabled");
97 int ktr_compile = KTR_COMPILE;
98 SYSCTL_INT(_debug_ktr, OID_AUTO, compile, CTLFLAG_RD,
99 &ktr_compile, 0, "Bitmask of KTR event classes compiled into the kernel");
101 int ktr_entries = KTR_ENTRIES;
102 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD,
103 &ktr_entries, 0, "Number of entries in the KTR buffer");
105 int ktr_version = KTR_VERSION;
106 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD,
107 &ktr_version, 0, "Version of the KTR interface");
109 volatile int ktr_idx = 0;
110 struct ktr_entry ktr_buf[KTR_ENTRIES];
113 sysctl_debug_ktr_clear(SYSCTL_HANDLER_ARGS)
118 error = sysctl_handle_int(oidp, &clear, 0, req);
119 if (error || !req->newptr)
123 bzero(ktr_buf, sizeof(ktr_buf));
129 SYSCTL_PROC(_debug_ktr, OID_AUTO, clear, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
130 sysctl_debug_ktr_clear, "I", "Clear KTR Buffer");
133 int ktr_verbose = KTR_VERBOSE;
134 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
135 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
140 char ktr_alq_file[MAXPATHLEN] = "/tmp/ktr.out";
142 int ktr_alq_depth = KTR_ENTRIES;
143 int ktr_alq_enabled = 0;
144 int ktr_alq_failed = 0;
147 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_max, CTLFLAG_RW, &ktr_alq_max, 0,
148 "Maximum number of entries to write");
149 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_cnt, CTLFLAG_RD, &ktr_alq_cnt, 0,
150 "Current number of written entries");
151 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_failed, CTLFLAG_RD, &ktr_alq_failed, 0,
152 "Number of times we overran the buffer");
153 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_depth, CTLFLAG_RW, &ktr_alq_depth, 0,
154 "Number of items in the write buffer");
155 SYSCTL_STRING(_debug_ktr, OID_AUTO, alq_file, CTLFLAG_RW, ktr_alq_file,
156 sizeof(ktr_alq_file), "KTR logging file");
159 sysctl_debug_ktr_alq_enable(SYSCTL_HANDLER_ARGS)
164 enable = ktr_alq_enabled;
166 error = sysctl_handle_int(oidp, &enable, 0, req);
167 if (error || !req->newptr)
173 error = alq_open(&ktr_alq, (const char *)ktr_alq_file,
174 req->td->td_ucred, ALQ_DEFAULT_CMODE,
175 sizeof(struct ktr_entry), ktr_alq_depth);
182 if (ktr_alq_enabled == 0)
191 SYSCTL_PROC(_debug_ktr, OID_AUTO, alq_enable,
192 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_debug_ktr_alq_enable,
193 "I", "Enable KTR logging");
197 ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
198 u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
201 struct ktr_entry *entry;
203 struct ale *ale = NULL;
205 int newindex, saveindex;
206 #if defined(KTR_VERBOSE) || defined(KTR_ALQ)
213 if ((ktr_mask & mask) == 0)
216 if (((1 << cpu) & ktr_cpumask) == 0)
218 #if defined(KTR_VERBOSE) || defined(KTR_ALQ)
220 if (td->td_pflags & TDP_INKTR)
222 td->td_pflags |= TDP_INKTR;
225 if (ktr_alq_enabled) {
226 if (td->td_critnest == 0 &&
227 (td->td_flags & TDF_IDLETD) == 0 &&
229 if (ktr_alq_max && ktr_alq_cnt > ktr_alq_max)
231 if ((ale = alq_get(ktr_alq, ALQ_NOWAIT)) == NULL) {
236 entry = (struct ktr_entry *)ale->ae_data;
245 newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
246 } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
247 entry = &ktr_buf[saveindex];
249 entry->ktr_timestamp = KTR_TIME;
250 entry->ktr_cpu = cpu;
251 entry->ktr_thread = curthread;
253 while (strncmp(file, "../", 3) == 0)
255 entry->ktr_file = file;
256 entry->ktr_line = line;
260 printf("cpu%d ", cpu);
262 if (ktr_verbose > 1) {
263 printf("%s.%d\t", entry->ktr_file,
266 printf(format, arg1, arg2, arg3, arg4, arg5, arg6);
270 entry->ktr_desc = format;
271 entry->ktr_parms[0] = arg1;
272 entry->ktr_parms[1] = arg2;
273 entry->ktr_parms[2] = arg3;
274 entry->ktr_parms[3] = arg4;
275 entry->ktr_parms[4] = arg5;
276 entry->ktr_parms[5] = arg6;
278 if (ktr_alq_enabled && ale)
279 alq_post(ktr_alq, ale);
282 #if defined(KTR_VERBOSE) || defined(KTR_ALQ)
283 td->td_pflags &= ~TDP_INKTR;
293 static struct tstate tstate;
294 static int db_ktr_verbose;
295 static int db_mach_vtrace(void);
297 DB_SHOW_COMMAND(ktr, db_ktr_all)
300 tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1);
303 db_ktr_verbose |= (index(modif, 'v') != NULL) ? 2 : 0;
304 db_ktr_verbose |= (index(modif, 'V') != NULL) ? 1 : 0; /* just timestap please */
305 if (index(modif, 'a') != NULL) {
307 while (cncheckc() != -1)
308 if (db_mach_vtrace() == 0)
311 while (!db_pager_quit)
312 if (db_mach_vtrace() == 0)
320 struct ktr_entry *kp;
322 if (tstate.cur == tstate.first) {
323 db_printf("--- End of trace buffer ---\n");
326 kp = &ktr_buf[tstate.cur];
328 /* Skip over unused entries. */
329 if (kp->ktr_desc == NULL) {
330 db_printf("--- End of trace buffer ---\n");
333 db_printf("%d (%p", tstate.cur, kp->ktr_thread);
335 db_printf(":cpu%d", kp->ktr_cpu);
338 if (db_ktr_verbose >= 1) {
339 db_printf(" %10.10lld", (long long)kp->ktr_timestamp);
341 if (db_ktr_verbose >= 2) {
342 db_printf(" %s.%d", kp->ktr_file, kp->ktr_line);
345 db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1],
346 kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4],
350 if (tstate.first == -1)
351 tstate.first = tstate.cur;
353 if (--tstate.cur < 0)
354 tstate.cur = KTR_ENTRIES - 1;