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 1.12 2005/12/12 08:15:02 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/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);
110 KTR_INFO(KTR_TESTLOG, testlog, test1, 0, "test1", sizeof(void *) * 4);
111 KTR_INFO(KTR_TESTLOG, testlog, test2, 1, "test2", sizeof(void *) * 4);
112 KTR_INFO(KTR_TESTLOG, testlog, test3, 2, "test3", sizeof(void *) * 4);
113 KTR_INFO(KTR_TESTLOG, testlog, test4, 3, "test4", 0);
114 KTR_INFO(KTR_TESTLOG, testlog, test5, 4, "test5", 0);
115 KTR_INFO(KTR_TESTLOG, testlog, test6, 5, "test6", 0);
117 KTR_INFO(KTR_TESTLOG, testlog, pingpong, 6, "pingpong", 0);
118 KTR_INFO(KTR_TESTLOG, testlog, pipeline, 7, "pipeline", 0);
120 KTR_INFO(KTR_TESTLOG, testlog, crit_beg, 8, "crit_beg", 0);
121 KTR_INFO(KTR_TESTLOG, testlog, crit_end, 9, "crit_end", 0);
122 KTR_INFO(KTR_TESTLOG, testlog, spin_beg, 10, "spin_beg", 0);
123 KTR_INFO(KTR_TESTLOG, testlog, spin_end, 11, "spin_end", 0);
124 #define logtest(name) KTR_LOG(testlog_ ## name, 0, 0, 0, 0)
125 #define logtest_noargs(name) KTR_LOG(testlog_ ## name)
127 MALLOC_DEFINE(M_KTR, "ktr", "ktr buffers");
129 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RW, 0, "ktr");
131 static int32_t ktr_cpumask = -1;
132 TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
133 SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
135 static int ktr_entries = KTR_ENTRIES;
136 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
138 static int ktr_version = KTR_VERSION;
139 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, "");
141 static int ktr_stacktrace = 1;
142 SYSCTL_INT(_debug_ktr, OID_AUTO, stacktrace, CTLFLAG_RD, &ktr_stacktrace, 0, "");
144 static int ktr_resynchronize = 0;
145 SYSCTL_INT(_debug_ktr, OID_AUTO, resynchronize, CTLFLAG_RW, &ktr_resynchronize, 0, "");
148 static int ktr_testlogcnt = 0;
149 SYSCTL_INT(_debug_ktr, OID_AUTO, testlogcnt, CTLFLAG_RW, &ktr_testlogcnt, 0, "");
150 static int ktr_testipicnt = 0;
151 static int ktr_testipicnt_remainder;
152 SYSCTL_INT(_debug_ktr, OID_AUTO, testipicnt, CTLFLAG_RW, &ktr_testipicnt, 0, "");
153 static int ktr_testcritcnt = 0;
154 SYSCTL_INT(_debug_ktr, OID_AUTO, testcritcnt, CTLFLAG_RW, &ktr_testcritcnt, 0, "");
155 static int ktr_testspincnt = 0;
156 SYSCTL_INT(_debug_ktr, OID_AUTO, testspincnt, CTLFLAG_RW, &ktr_testspincnt, 0, "");
160 * Give cpu0 a static buffer so the tracepoint facility can be used during
161 * early boot (note however that we still use a critical section, XXX).
163 static struct ktr_entry ktr_buf0[KTR_ENTRIES];
164 static struct ktr_entry *ktr_buf[MAXCPU] = { &ktr_buf0[0] };
165 static int ktr_idx[MAXCPU];
167 static int ktr_sync_state = 0;
168 static int ktr_sync_count;
169 static int64_t ktr_sync_tsc;
171 struct callout ktr_resync_callout;
174 int ktr_verbose = KTR_VERBOSE;
175 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
176 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
179 extern int64_t tsc_offsets[];
181 #if KTR_TESTLOG || KTR_ALL
184 ktr_sysinit(void *dummy)
188 for(i = 1; i < ncpus; ++i) {
189 ktr_buf[i] = malloc(KTR_ENTRIES * sizeof(struct ktr_entry),
190 M_KTR, M_WAITOK | M_ZERO);
193 SYSINIT(ktr_sysinit, SI_SUB_INTRINSIC, SI_ORDER_FIRST, ktr_sysinit, NULL);
198 * Try to resynchronize the TSC's for all cpus. This is really, really nasty.
199 * We have to send an IPIQ message to all remote cpus, wait until they
200 * get into their IPIQ processing code loop, then do an even stricter hard
201 * loop to get the cpus as close to synchronized as we can to get the most
204 * This callback occurs on cpu0.
206 static void ktr_resync_callback(void *dummy);
207 static void ktr_pingpong_remote(void *dummy);
208 static void ktr_pipeline_remote(void *dummy);
211 ktr_resyncinit(void *dummy)
213 callout_init(&ktr_resync_callout);
214 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
216 SYSINIT(ktr_resync, SI_SUB_FINISH_SMP+1, SI_ORDER_ANY, ktr_resyncinit, NULL);
220 static void ktr_resync_remote(void *dummy);
221 extern cpumask_t smp_active_mask;
224 * We use a callout callback instead of a systimer because we cannot afford
225 * to preempt anyone to do this, or we might deadlock a spin-lock or
226 * serializer between two cpus.
230 ktr_resync_callback(void *dummy __unused)
234 KKASSERT(mycpu->gd_cpuid == 0);
240 if (ktr_testlogcnt) {
246 logtest_noargs(test4);
247 logtest_noargs(test5);
248 logtest_noargs(test6);
255 if (ktr_testipicnt && ktr_testipicnt_remainder == 0 && ncpus > 1) {
256 ktr_testipicnt_remainder = ktr_testipicnt;
258 lwkt_send_ipiq_bycpu(1, ktr_pingpong_remote, NULL);
262 * Test critical sections
264 if (ktr_testcritcnt) {
267 logtest_noargs(crit_beg);
268 for (count = ktr_testcritcnt; count; --count) {
272 logtest_noargs(crit_end);
277 * Test spinlock sections
279 if (ktr_testspincnt) {
280 struct spinlock spin;
283 spin_lock_quick(&spin);
284 spin_unlock_quick(&spin);
285 logtest_noargs(spin_beg);
286 for (count = ktr_testspincnt; count; --count) {
287 spin_lock_quick(&spin);
288 spin_unlock_quick(&spin);
290 logtest_noargs(spin_end);
296 * Resynchronize the TSC
298 if (ktr_resynchronize == 0)
300 if ((cpu_feature & CPUID_TSC) == 0)
304 * Send the synchronizing IPI and wait for all cpus to get into
305 * their spin loop. We must process incoming IPIs while waiting
306 * to avoid a deadlock.
311 ktr_sync_tsc = rdtsc();
312 count = lwkt_send_ipiq_mask(mycpu->gd_other_cpus & smp_active_mask,
313 (ipifunc1_t)ktr_resync_remote, NULL);
314 while (ktr_sync_count != count)
318 * Continuously update the TSC for cpu 0 while waiting for all other
319 * cpus to finish stage 2.
322 ktr_sync_tsc = rdtsc();
326 while (ktr_sync_count != 0) {
327 ktr_sync_tsc = rdtsc();
335 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
339 * The remote-end of the KTR synchronization protocol runs on all cpus except
340 * cpu 0. Since this is an IPI function, it is entered with the current
341 * thread in a critical section.
344 ktr_resync_remote(void *dummy __unused)
346 volatile int64_t tsc1 = ktr_sync_tsc;
347 volatile int64_t tsc2;
350 * Inform the master that we have entered our hard loop.
352 KKASSERT(ktr_sync_state == 1);
353 atomic_add_int(&ktr_sync_count, 1);
354 while (ktr_sync_state == 1) {
359 * Now the master is in a hard loop, synchronize the TSC and
363 KKASSERT(ktr_sync_state == 2);
366 tsc_offsets[mycpu->gd_cpuid] = rdtsc() - tsc2;
367 atomic_subtract_int(&ktr_sync_count, 1);
373 ktr_pingpong_remote(void *dummy __unused)
377 logtest_noargs(pingpong);
378 other_cpu = 1 - mycpu->gd_cpuid;
379 if (ktr_testipicnt_remainder) {
380 --ktr_testipicnt_remainder;
381 lwkt_send_ipiq_bycpu(other_cpu, ktr_pingpong_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);
387 lwkt_send_ipiq_bycpu(other_cpu, ktr_pipeline_remote, NULL);
393 ktr_pipeline_remote(void *dummy __unused)
395 logtest_noargs(pipeline);
401 * The resync callback for UP doesn't do anything other then run the test
402 * log messages. If test logging is not enabled, don't bother resetting
407 ktr_resync_callback(void *dummy __unused)
413 if (ktr_testlogcnt) {
419 logtest_noargs(test4);
420 logtest_noargs(test5);
421 logtest_noargs(test6);
424 callout_reset(&ktr_resync_callout, hz / 10, ktr_resync_callback, NULL);
431 * KTR_WRITE_ENTRY - Primary entry point for kernel trace logging
435 ktr_write_entry(struct ktr_info *info, const char *file, int line,
438 struct ktr_entry *entry;
441 cpu = mycpu->gd_cpuid;
444 entry = ktr_buf[cpu] + (ktr_idx[cpu] & KTR_ENTRIES_MASK);
446 if (cpu_feature & CPUID_TSC) {
448 entry->ktr_timestamp = rdtsc() - tsc_offsets[cpu];
450 entry->ktr_timestamp = rdtsc();
453 entry->ktr_timestamp = get_approximate_time_t();
455 entry->ktr_info = info;
456 entry->ktr_file = file;
457 entry->ktr_line = line;
459 if (info->kf_data_size > KTR_BUFSIZE)
460 bcopyi(ptr, entry->ktr_data, KTR_BUFSIZE);
461 else if (info->kf_data_size)
462 bcopyi(ptr, entry->ktr_data, info->kf_data_size);
464 cpu_ktr_caller(entry);
467 if (ktr_verbose && info->kf_format) {
469 printf("cpu%d ", cpu);
471 if (ktr_verbose > 1) {
472 printf("%s.%d\t", entry->ktr_file, entry->ktr_line);
474 vprintf(info->kf_format, ptr);
481 ktr_log(struct ktr_info *info, const char *file, int line, ...)
485 if (panicstr == NULL) {
486 __va_start(va, line);
487 ktr_write_entry(info, file, line, va);
493 ktr_log_ptr(struct ktr_info *info, const char *file, int line, const void *ptr)
495 if (panicstr == NULL) {
496 ktr_write_entry(info, file, line, ptr);
502 #define NUM_LINES_PER_PAGE 19
509 static int db_ktr_verbose;
510 static int db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx);
512 DB_SHOW_COMMAND(ktr, db_ktr_all)
518 struct tstate tstate[MAXCPU];
521 for(i = 0; i < ncpus; i++) {
522 tstate[i].first = -1;
523 tstate[i].cur = ktr_idx[i] & KTR_ENTRIES_MASK;
526 while ((c = *(modif++)) != '\0') {
535 while ((c = *(modif++)) != '\0') {
548 if (printcpu > ncpus - 1) {
549 db_printf("Invalid cpu number\n");
553 * Lopp throug all the buffers and print the content of them, sorted
558 u_int64_t highest_ts;
560 struct ktr_entry *kp;
562 if (a_flag == 1 && cncheckc() != -1)
567 * Find the lowest timestamp
569 for (i = 0, counter = 0; i < ncpus; i++) {
570 if (ktr_buf[i] == NULL)
572 if (printcpu != -1 && printcpu != i)
574 if (tstate[i].cur == -1) {
576 if (counter == ncpus) {
577 db_printf("--- End of trace buffer ---\n");
582 if (ktr_buf[i][tstate[i].cur].ktr_timestamp > highest_ts) {
583 highest_ts = ktr_buf[i][tstate[i].cur].ktr_timestamp;
589 kp = &ktr_buf[i][tstate[i].cur];
590 if (tstate[i].first == -1)
591 tstate[i].first = tstate[i].cur;
592 if (--tstate[i].cur < 0)
593 tstate[i].cur = KTR_ENTRIES - 1;
594 if (tstate[i].first == tstate[i].cur) {
595 db_mach_vtrace(i, kp, tstate[i].cur + 1);
599 if (ktr_buf[i][tstate[i].cur].ktr_info == NULL)
601 if (db_more(&nl) == -1)
603 if (db_mach_vtrace(i, kp, tstate[i].cur + 1) == 0)
609 db_mach_vtrace(int cpu, struct ktr_entry *kp, int idx)
611 if (kp->ktr_info == NULL)
614 db_printf("cpu%d ", cpu);
616 db_printf("%d: ", idx);
617 if (db_ktr_verbose) {
618 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp,
619 kp->ktr_file, kp->ktr_line);
621 db_printf("%s\t", kp->ktr_info->kf_name);
622 db_printf("from(%p,%p) ", kp->ktr_caller1, kp->ktr_caller2);
623 if (kp->ktr_info->kf_format) {
624 int32_t *args = kp->ktr_data;
625 db_printf(kp->ktr_info->kf_format,
626 args[0], args[1], args[2], args[3],
627 args[4], args[5], args[6], args[7],
628 args[8], args[9], args[10], args[11]);