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 1.23 2008/02/12 23:33:23 corecode 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/spinlock.h>
85 #include <sys/thread2.h>
86 #include <sys/spinlock2.h>
87 #include <sys/ctype.h>
89 #include <machine/cpu.h>
90 #include <machine/cpufunc.h>
91 #include <machine/specialreg.h>
92 #include <machine/md_var.h>
97 #define KTR_ENTRIES 2048
99 #define KTR_ENTRIES_MASK (KTR_ENTRIES - 1)
102 * test logging support. When ktr_testlogcnt is non-zero each synchronization
103 * interrupt will issue six back-to-back ktr logging messages on cpu 0
104 * so the user can determine KTR logging overheads.
106 #if !defined(KTR_TESTLOG)
107 #define KTR_TESTLOG KTR_ALL
109 KTR_INFO_MASTER(testlog);
111 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1", sizeof(void *) * 4);
112 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2", sizeof(void *) * 4);
113 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3", sizeof(void *) * 4);
114 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4", 0);
115 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5", 0);
116 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6", 0);
118 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong", 0);
119 KTR_INFO(KTR_TESTLOG, testlog, pipeline, 7, "pipeline", 0);
121 KTR_INFO(KTR_TESTLOG, testlog, crit_beg, 8, "crit_beg", 0);
122 KTR_INFO(KTR_TESTLOG, testlog, crit_end, 9, "crit_end", 0);
123 KTR_INFO(KTR_TESTLOG, testlog, spin_beg, 10, "spin_beg", 0);
124 KTR_INFO(KTR_TESTLOG, testlog, spin_end, 11, "spin_end", 0);
125 #define logtest(name) KTR_LOG(testlog_ ## name, 0, 0, 0, 0)
126 #define logtest_noargs(name) KTR_LOG(testlog_ ## name)
129 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers");
131 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr");
133 int ktr_entries = KTR_ENTRIES;
134 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
136 int ktr_version = KTR_VERSION;
137 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, "");
139 static int ktr_stacktrace = 1;
140 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, "");
142 static int ktr_resynchronize = 0;
143 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW, &ktr_resynchronize, 0, "");
146 static int ktr_testlogcnt = 0;
147 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, "");
148 static int ktr_testipicnt = 0;
149 static int ktr_testipicnt_remainder;
150 SYSCTL_INT(_debug_ktr, OID_AUTO, testipicnt, CTLFLAG_RW, &ktr_testipicnt, 0, "");
151 static int ktr_testcritcnt = 0;
152 SYSCTL_INT(_debug_ktr, OID_AUTO, testcritcnt, CTLFLAG_RW, &ktr_testcritcnt, 0, "");
153 static int ktr_testspincnt = 0;
154 SYSCTL_INT(_debug_ktr, OID_AUTO, testspincnt, CTLFLAG_RW, &ktr_testspincnt, 0, "");
158 * Give cpu0 a static buffer so the tracepoint facility can be used during
159 * early boot (note however that we still use a critical section, XXX).
161 static struct ktr_entry ktr_buf0[KTR_ENTRIES];
162 struct ktr_entry *ktr_buf[MAXCPU] = { &ktr_buf0[0] };
165 static int ktr_sync_state = 0;
166 static int ktr_sync_count;
167 static int64_t ktr_sync_tsc;
169 struct callout ktr_resync_callout;
172 int ktr_verbose = KTR_VERBOSE;
173 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
174 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
177 static void ktr_resync_callback(void *dummy __unused);
179 extern int64_t tsc_offsets[];
182 ktr_sysinit(void *dummy)
186 for(i = 1; i < ncpus; ++i) {
187 ktr_buf[i] = kmalloc(KTR_ENTRIES * sizeof(struct ktr_entry),
188 M_KTR, M_WAITOK | M_ZERO);
190 callout_init(&ktr_resync_callout);
191 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
193 SYSINIT(ktr_sysinit, SI_BOOT2_KLD, SI_ORDER_ANY, ktr_sysinit, NULL);
196 * Try to resynchronize the TSC's for all cpus. This is really, really nasty.
197 * We have to send an IPIQ message to all remote cpus, wait until they
198 * get into their IPIQ processing code loop, then do an even stricter hard
199 * loop to get the cpus as close to synchronized as we can to get the most
202 * This callback occurs on cpu0.
205 static void ktr_pingpong_remote(void *dummy);
206 static void ktr_pipeline_remote(void *dummy);
209 #if defined(SMP) && defined(_RDTSC_SUPPORTED_)
211 static void ktr_resync_remote(void *dummy);
212 extern cpumask_t smp_active_mask;
215 * We use a callout callback instead of a systimer because we cannot afford
216 * to preempt anyone to do this, or we might deadlock a spin-lock or
217 * serializer between two cpus.
221 ktr_resync_callback(void *dummy __unused)
225 KKASSERT(mycpu->gd_cpuid == 0);
231 if (ktr_testlogcnt) {
237 logtest_noargs(test4);
238 logtest_noargs(test5);
239 logtest_noargs(test6);
246 if (ktr_testipicnt && ktr_testipicnt_remainder == 0 && ncpus > 1) {
247 ktr_testipicnt_remainder = ktr_testipicnt;
249 lwkt_send_ipiq_bycpu(1, ktr_pingpong_remote, NULL);
253 * Test critical sections
255 if (ktr_testcritcnt) {
258 logtest_noargs(crit_beg);
259 for (count = ktr_testcritcnt; count; --count) {
263 logtest_noargs(crit_end);
268 * Test spinlock sections
270 if (ktr_testspincnt) {
271 struct spinlock spin;
275 spin_unlock_wr(&spin);
276 logtest_noargs(spin_beg);
277 for (count = ktr_testspincnt; count; --count) {
279 spin_unlock_wr(&spin);
281 logtest_noargs(spin_end);
282 logtest_noargs(spin_beg);
283 for (count = ktr_testspincnt; count; --count) {
285 spin_unlock_rd(&spin);
287 logtest_noargs(spin_end);
293 * Resynchronize the TSC
295 if (ktr_resynchronize == 0)
297 if ((cpu_feature & CPUID_TSC) == 0)
301 * Send the synchronizing IPI and wait for all cpus to get into
302 * their spin loop. We must process incoming IPIs while waiting
303 * to avoid a deadlock.
308 ktr_sync_tsc = rdtsc();
309 count = lwkt_send_ipiq_mask(mycpu->gd_other_cpus & smp_active_mask,
310 (ipifunc1_t)ktr_resync_remote, NULL);
311 while (ktr_sync_count != count)
315 * Continuously update the TSC for cpu 0 while waiting for all other
316 * cpus to finish stage 2.
319 ktr_sync_tsc = rdtsc();
323 while (ktr_sync_count != 0) {
324 ktr_sync_tsc = rdtsc();
332 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
336 * The remote-end of the KTR synchronization protocol runs on all cpus except
337 * cpu 0. Since this is an IPI function, it is entered with the current
338 * thread in a critical section.
341 ktr_resync_remote(void *dummy __unused)
343 volatile int64_t tsc1 = ktr_sync_tsc;
344 volatile int64_t tsc2;
347 * Inform the master that we have entered our hard loop.
349 KKASSERT(ktr_sync_state == 1);
350 atomic_add_int(&ktr_sync_count, 1);
351 while (ktr_sync_state == 1) {
356 * Now the master is in a hard loop, synchronize the TSC and
360 KKASSERT(ktr_sync_state == 2);
363 tsc_offsets[mycpu->gd_cpuid] = rdtsc() - tsc2;
364 atomic_subtract_int(&ktr_sync_count, 1);
372 ktr_pingpong_remote(void *dummy __unused)
376 logtest_noargs(pingpong);
377 other_cpu = 1 - mycpu->gd_cpuid;
378 if (ktr_testipicnt_remainder) {
379 --ktr_testipicnt_remainder;
380 lwkt_send_ipiq_bycpu(other_cpu, ktr_pingpong_remote, NULL);
382 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
383 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
384 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
385 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
386 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
392 ktr_pipeline_remote(void *dummy __unused)
394 logtest_noargs(pipeline);
402 * The resync callback for UP doesn't do anything other then run the test
403 * log messages. If test logging is not enabled, don't bother resetting
408 ktr_resync_callback(void *dummy __unused)
414 if (ktr_testlogcnt) {
420 logtest_noargs(test4);
421 logtest_noargs(test5);
422 logtest_noargs(test6);
425 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
432 * KTR_WRITE_ENTRY - Primary entry point for kernel trace logging
436 ktr_write_entry(struct ktr_info *info, const char *file, int line,
439 struct ktr_entry *entry;
442 cpu = mycpu->gd_cpuid;
447 entry = ktr_buf[cpu] + (ktr_idx[cpu] & KTR_ENTRIES_MASK);
449 #ifdef _RDTSC_SUPPORTED_
450 if (cpu_feature & CPUID_TSC) {
452 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu];
454 entry->ktr_timestamp = rdtsc();
459 entry->ktr_timestamp = get_approximate_time_t();
461 entry->ktr_info = info;
462 entry->ktr_file = file;
463 entry->ktr_line = line;
465 if (info->kf_data_size > KTR_BUFSIZE)
466 bcopyi(ptr, entry->ktr_data, KTR_BUFSIZE);
467 else if (info->kf_data_size)
468 bcopyi(ptr, entry->ktr_data, info->kf_data_size);
470 cpu_ktr_caller(entry);
472 if (ktr_verbose && info->kf_format) {
474 kprintf("cpu%d ", cpu);
476 if (ktr_verbose > 1) {
477 kprintf("%s.%d\t", entry->ktr_file, entry->ktr_line);
479 kvprintf(info->kf_format, ptr);
486 ktr_log(struct ktr_info *info, const char *file, int line, ...)
490 if (panicstr == NULL) {
491 __va_start(va, line);
492 ktr_write_entry(info, file, line, va);
498 ktr_log_ptr(struct ktr_info *info, const char *file, int line, const void *ptr)
500 if (panicstr == NULL) {
501 ktr_write_entry(info, file, line, ptr);
507 #define NUM_LINES_PER_PAGE 19
514 static int db_ktr_verbose;
515 static int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx);
517 DB_SHOW_COMMAND(ktr, db_ktr_all)
523 struct tstate tstate[MAXCPU];
526 for(i = 0; i < ncpus; i++) {
527 tstate[i].first = -1;
528 tstate[i].cur = ktr_idx[i] & KTR_ENTRIES_MASK;
531 while ((c = *(modif++)) != '\0') {
540 while ((c = *(modif++)) != '\0') {
553 if (printcpu > ncpus - 1) {
554 db_printf("Invalid cpu number\n");
558 * Lopp throug all the buffers and print the content of them, sorted
563 u_int64_t highest_ts;
565 struct ktr_entry *kp;
567 if (a_flag == 1 && cncheckc() != -1)
572 * Find the lowest timestamp
574 for (i = 0, counter = 0; i < ncpus; i++) {
575 if (ktr_buf[i] == NULL)
577 if (printcpu != -1 && printcpu != i)
579 if (tstate[i].cur == -1) {
581 if (counter == ncpus) {
582 db_printf("--- End of trace buffer ---\n");
587 if (ktr_buf[i][tstate[i].cur].ktr_timestamp > highest_ts) {
588 highest_ts = ktr_buf[i][tstate[i].cur].ktr_timestamp;
594 kp = &ktr_buf[i][tstate[i].cur];
595 if (tstate[i].first == -1)
596 tstate[i].first = tstate[i].cur;
597 if (--tstate[i].cur < 0)
598 tstate[i].cur = KTR_ENTRIES - 1;
599 if (tstate[i].first == tstate[i].cur) {
600 db_mach_vtrace(i, kp, tstate[i].cur + 1);
604 if (ktr_buf[i][tstate[i].cur].ktr_info == NULL)
606 if (db_more(&nl) == -1)
608 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0)
614 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx)
616 if (kp->ktr_info == NULL)
619 db_printf("cpu%d ", cpu);
621 db_printf("%d: ", idx);
622 if (db_ktr_verbose) {
623 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp,
624 kp->ktr_file, kp->ktr_line);
626 db_printf("%s\t", kp->ktr_info->kf_name);
627 db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2);
628 if (kp->ktr_info->kf_format) {
629 int32_t *args = kp->ktr_data;
630 db_printf(kp->ktr_info->kf_format,
631 args[0], args[1], args[2], args[3],
632 args[4], args[5], args[6], args[7],
633 args[8], args[9], args[10], args[11]);