2 * Copyright (c) 2005 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * The following copyright applies to the DDB command code:
37 * Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org>
38 * All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. Neither the name of the author nor the names of any co-contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * $DragonFly: src/sys/kern/kern_ktr.c,v 1.11 2005/12/10 21:19:30 dillon Exp $
68 * Kernel tracepoint facility.
74 #include <sys/param.h>
76 #include <sys/kernel.h>
77 #include <sys/libkern.h>
79 #include <sys/sysctl.h>
81 #include <sys/systm.h>
83 #include <sys/malloc.h>
84 #include <sys/thread2.h>
85 #include <sys/ctype.h>
87 #include <machine/cpu.h>
88 #include <machine/cpufunc.h>
89 #include <machine/specialreg.h>
90 #include <machine/md_var.h>
95 #define KTR_ENTRIES 2048
97 #define KTR_ENTRIES_MASK (KTR_ENTRIES - 1)
100 * test logging support. When ktr_testlogcnt is non-zero each synchronization
101 * interrupt will issue six back-to-back ktr logging messages on cpu 0
102 * so the user can determine KTR logging overheads.
104 #if !defined(KTR_TESTLOG)
105 #define KTR_TESTLOG KTR_ALL
107 KTR_INFO_MASTER(testlog);
108 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1", sizeof(void *) * 4);
109 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2", sizeof(void *) * 4);
110 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3", sizeof(void *) * 4);
111 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4", 0);
112 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5", 0);
113 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6", 0);
114 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong", 0);
115 #define logtest(name) KTR_LOG(testlog_ ## name, 0, 0, 0, 0)
116 #define logtest_noargs(name) KTR_LOG(testlog_ ## name)
118 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers");
120 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr");
122 static int32_t ktr_cpumask = -1;
123 TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
124 SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
126 static int ktr_entries = KTR_ENTRIES;
127 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
129 static int ktr_version = KTR_VERSION;
130 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, "");
132 static int ktr_stacktrace = 1;
133 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, "");
135 static int ktr_resynchronize = 0;
136 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW, &ktr_resynchronize, 0, "");
139 static int ktr_testlogcnt = 0;
140 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, "");
141 static int ktr_testipicnt = 0;
142 static int ktr_testipicnt_remainder;
143 SYSCTL_INT(_debug_ktr, OID_AUTO, testipicnt, CTLFLAG_RW, &ktr_testipicnt, 0, "");
147 * Give cpu0 a static buffer so the tracepoint facility can be used during
148 * early boot (note however that we still use a critical section, XXX).
150 static struct ktr_entry ktr_buf0[KTR_ENTRIES];
151 static struct ktr_entry *ktr_buf[MAXCPU] = { &ktr_buf0[0] };
152 static int ktr_idx[MAXCPU];
154 static int ktr_sync_state = 0;
155 static int ktr_sync_count;
156 static int64_t ktr_sync_tsc;
158 struct callout ktr_resync_callout;
161 int ktr_verbose = KTR_VERBOSE;
162 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
163 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
167 int64_t tsc_offsets[MAXCPU];
169 int64_t tsc_offsets[1];
172 #if KTR_TESTLOG || KTR_ALL
175 ktr_sysinit(void *dummy)
179 for(i = 1; i < ncpus; ++i) {
180 ktr_buf[i] = malloc(KTR_ENTRIES * sizeof(struct ktr_entry),
181 M_KTR, M_WAITOK | M_ZERO);
184 SYSINIT(ktr_sysinit, SI_SUB_INTRINSIC, SI_ORDER_FIRST, ktr_sysinit, NULL);
189 * Try to resynchronize the TSC's for all cpus. This is really, really nasty.
190 * We have to send an IPIQ message to all remote cpus, wait until they
191 * get into their IPIQ processing code loop, then do an even stricter hard
192 * loop to get the cpus as close to synchronized as we can to get the most
195 * This callback occurs on cpu0.
197 static void ktr_resync_callback(void *dummy);
198 static void ktr_pingpong_remote(void *dummy);
201 ktr_resyncinit(void *dummy)
203 callout_init(&ktr_resync_callout);
204 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
206 SYSINIT(ktr_resync, SI_SUB_FINISH_SMP+1, SI_ORDER_ANY, ktr_resyncinit, NULL);
210 static void ktr_resync_remote(void *dummy);
211 extern cpumask_t smp_active_mask;
214 * We use a callout callback instead of a systimer because we cannot afford
215 * to preempt anyone to do this, or we might deadlock a spin-lock or
216 * serializer between two cpus.
220 ktr_resync_callback(void *dummy __unused)
224 KKASSERT(mycpu->gd_cpuid == 0);
230 if (ktr_testlogcnt) {
236 logtest_noargs(test4);
237 logtest_noargs(test5);
238 logtest_noargs(test6);
245 if (ktr_testipicnt && ktr_testipicnt_remainder == 0 && ncpus > 1) {
246 ktr_testipicnt_remainder = ktr_testipicnt;
248 lwkt_send_ipiq_bycpu(1, ktr_pingpong_remote, NULL);
253 * Resynchronize the TSC
255 if (ktr_resynchronize == 0)
257 if ((cpu_feature & CPUID_TSC) == 0)
261 * Send the synchronizing IPI and wait for all cpus to get into
262 * their spin loop. We must process incoming IPIs while waiting
263 * to avoid a deadlock.
268 ktr_sync_tsc = rdtsc();
269 count = lwkt_send_ipiq_mask(mycpu->gd_other_cpus & smp_active_mask,
270 (ipifunc1_t)ktr_resync_remote, NULL);
271 while (ktr_sync_count != count)
275 * Continuously update the TSC for cpu 0 while waiting for all other
276 * cpus to finish stage 2.
279 ktr_sync_tsc = rdtsc();
283 while (ktr_sync_count != 0) {
284 ktr_sync_tsc = rdtsc();
292 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
296 * The remote-end of the KTR synchronization protocol runs on all cpus except
297 * cpu 0. Since this is an IPI function, it is entered with the current
298 * thread in a critical section.
301 ktr_resync_remote(void *dummy __unused)
303 volatile int64_t tsc1 = ktr_sync_tsc;
304 volatile int64_t tsc2;
307 * Inform the master that we have entered our hard loop.
309 KKASSERT(ktr_sync_state == 1);
310 atomic_add_int(&ktr_sync_count, 1);
311 while (ktr_sync_state == 1) {
316 * Now the master is in a hard loop, synchronize the TSC and
320 KKASSERT(ktr_sync_state == 2);
323 tsc_offsets[mycpu->gd_cpuid] = rdtsc() - tsc2;
324 atomic_subtract_int(&ktr_sync_count, 1);
330 ktr_pingpong_remote(void *dummy __unused)
332 logtest_noargs(pingpong);
333 if (ktr_testipicnt_remainder) {
334 --ktr_testipicnt_remainder;
335 lwkt_send_ipiq_bycpu(1 - mycpu->gd_cpuid,
336 ktr_pingpong_remote, NULL);
343 * The resync callback for UP doesn't do anything other then run the test
344 * log messages. If test logging is not enabled, don't bother resetting
349 ktr_resync_callback(void *dummy __unused)
355 if (ktr_testlogcnt) {
361 logtest_noargs(test4);
362 logtest_noargs(test5);
363 logtest_noargs(test6);
366 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
373 * KTR_WRITE_ENTRY - Primary entry point for kernel trace logging
377 ktr_write_entry(struct ktr_info *info, const char *file, int line,
380 struct ktr_entry *entry;
383 cpu = mycpu->gd_cpuid;
386 entry = ktr_buf[cpu] + (ktr_idx[cpu] & KTR_ENTRIES_MASK);
388 if (cpu_feature & CPUID_TSC) {
390 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu];
392 entry->ktr_timestamp = rdtsc();
395 entry->ktr_timestamp = get_approximate_time_t();
397 entry->ktr_info = info;
398 entry->ktr_file = file;
399 entry->ktr_line = line;
401 if (info->kf_data_size > KTR_BUFSIZE)
402 bcopyi(ptr, entry->ktr_data, KTR_BUFSIZE);
403 else if (info->kf_data_size)
404 bcopyi(ptr, entry->ktr_data, info->kf_data_size);
406 cpu_ktr_caller(entry);
409 if (ktr_verbose && info->kf_format) {
411 printf("cpu%d ", cpu);
413 if (ktr_verbose > 1) {
414 printf("%s.%d\t", entry->ktr_file, entry->ktr_line);
416 vprintf(info->kf_format, ptr);
423 ktr_log(struct ktr_info *info, const char *file, int line, ...)
427 if (panicstr == NULL) {
428 __va_start(va, line);
429 ktr_write_entry(info, file, line, va);
435 ktr_log_ptr(struct ktr_info *info, const char *file, int line, const void *ptr)
437 if (panicstr == NULL) {
438 ktr_write_entry(info, file, line, ptr);
444 #define NUM_LINES_PER_PAGE 19
451 static int db_ktr_verbose;
452 static int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx);
454 DB_SHOW_COMMAND(ktr, db_ktr_all)
460 struct tstate tstate[MAXCPU];
463 for(i = 0; i < ncpus; i++) {
464 tstate[i].first = -1;
465 tstate[i].cur = ktr_idx[i] & KTR_ENTRIES_MASK;
468 while ((c = *(modif++)) != '\0') {
477 while ((c = *(modif++)) != '\0') {
490 if (printcpu > ncpus - 1) {
491 db_printf("Invalid cpu number\n");
495 * Lopp throug all the buffers and print the content of them, sorted
500 u_int64_t highest_ts;
502 struct ktr_entry *kp;
504 if (a_flag == 1 && cncheckc() != -1)
509 * Find the lowest timestamp
511 for (i = 0, counter = 0; i < ncpus; i++) {
512 if (ktr_buf[i] == NULL)
514 if (printcpu != -1 && printcpu != i)
516 if (tstate[i].cur == -1) {
518 if (counter == ncpus) {
519 db_printf("--- End of trace buffer ---\n");
524 if (ktr_buf[i][tstate[i].cur].ktr_timestamp > highest_ts) {
525 highest_ts = ktr_buf[i][tstate[i].cur].ktr_timestamp;
531 kp = &ktr_buf[i][tstate[i].cur];
532 if (tstate[i].first == -1)
533 tstate[i].first = tstate[i].cur;
534 if (--tstate[i].cur < 0)
535 tstate[i].cur = KTR_ENTRIES - 1;
536 if (tstate[i].first == tstate[i].cur) {
537 db_mach_vtrace(i, kp, tstate[i].cur + 1);
541 if (ktr_buf[i][tstate[i].cur].ktr_info == NULL)
543 if (db_more(&nl) == -1)
545 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0)
551 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx)
553 if (kp->ktr_info == NULL)
556 db_printf("cpu%d ", cpu);
558 db_printf("%d: ", idx);
559 if (db_ktr_verbose) {
560 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp,
561 kp->ktr_file, kp->ktr_line);
563 db_printf("%s\t", kp->ktr_info->kf_name);
564 db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2);
565 if (kp->ktr_info->kf_format) {
566 int32_t *args = kp->ktr_data;
567 db_printf(kp->ktr_info->kf_format,
568 args[0], args[1], args[2], args[3],
569 args[4], args[5], args[6], args[7],
570 args[8], args[9], args[10], args[11]);