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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * This module holds the global variables used by KTR and the ktr_tracepoint()
29 * function that does the actual tracing.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/queue.h>
43 #include <sys/cpuset.h>
44 #include <sys/kernel.h>
46 #include <sys/libkern.h>
48 #include <sys/malloc.h>
49 #include <sys/mutex.h>
52 #include <sys/sysctl.h>
53 #include <sys/systm.h>
56 #include <machine/cpu.h>
58 #include <machine/ktr.h>
63 #include <ddb/db_output.h>
66 #ifndef KTR_BOOT_ENTRIES
67 #define KTR_BOOT_ENTRIES 1024
71 #define KTR_ENTRIES 1024
74 /* Limit the allocations to something manageable. */
75 #define KTR_ENTRIES_MAX (8 * 1024 * 1024)
82 #define KTR_CPUMASK CPUSET_FSET
86 #define KTR_TIME get_cyclecount()
90 #define KTR_CPU PCPU_GET(cpuid)
93 static MALLOC_DEFINE(M_KTR, "KTR", "KTR");
95 FEATURE(ktr, "Kernel support for KTR kernel tracing facility");
97 volatile int ktr_idx = 0;
98 int ktr_mask = KTR_MASK;
99 int ktr_compile = KTR_COMPILE;
100 int ktr_entries = KTR_BOOT_ENTRIES;
101 int ktr_version = KTR_VERSION;
102 struct ktr_entry ktr_buf_init[KTR_BOOT_ENTRIES];
103 struct ktr_entry *ktr_buf = ktr_buf_init;
104 cpuset_t ktr_cpumask = CPUSET_T_INITIALIZER(KTR_CPUMASK);
105 static char ktr_cpumask_str[CPUSETBUFSIZ];
107 TUNABLE_INT("debug.ktr.mask", &ktr_mask);
109 TUNABLE_STR("debug.ktr.cpumask", ktr_cpumask_str, sizeof(ktr_cpumask_str));
111 static SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
113 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD,
114 &ktr_version, 0, "Version of the KTR interface");
116 SYSCTL_UINT(_debug_ktr, OID_AUTO, compile, CTLFLAG_RD,
117 &ktr_compile, 0, "Bitmask of KTR event classes compiled into the kernel");
120 ktr_cpumask_initializer(void *dummy __unused)
124 * TUNABLE_STR() runs with SI_ORDER_MIDDLE priority, thus it must be
125 * already set, if necessary.
127 if (ktr_cpumask_str[0] != '\0' &&
128 cpusetobj_strscan(&ktr_cpumask, ktr_cpumask_str) == -1)
129 CPU_FILL(&ktr_cpumask);
131 SYSINIT(ktr_cpumask_initializer, SI_SUB_TUNABLES, SI_ORDER_ANY,
132 ktr_cpumask_initializer, NULL);
135 sysctl_debug_ktr_cpumask(SYSCTL_HANDLER_ARGS)
137 char lktr_cpumask_str[CPUSETBUFSIZ];
141 cpusetobj_strprint(lktr_cpumask_str, &ktr_cpumask);
142 error = sysctl_handle_string(oidp, lktr_cpumask_str,
143 sizeof(lktr_cpumask_str), req);
144 if (error != 0 || req->newptr == NULL)
146 if (cpusetobj_strscan(&imask, lktr_cpumask_str) == -1)
148 CPU_COPY(&imask, &ktr_cpumask);
152 SYSCTL_PROC(_debug_ktr, OID_AUTO, cpumask,
153 CTLFLAG_RW | CTLFLAG_MPSAFE | CTLTYPE_STRING, NULL, 0,
154 sysctl_debug_ktr_cpumask, "S",
155 "Bitmask of CPUs on which KTR logging is enabled");
158 sysctl_debug_ktr_clear(SYSCTL_HANDLER_ARGS)
163 error = sysctl_handle_int(oidp, &clear, 0, req);
164 if (error || !req->newptr)
168 bzero(ktr_buf, sizeof(*ktr_buf) * ktr_entries);
174 SYSCTL_PROC(_debug_ktr, OID_AUTO, clear, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
175 sysctl_debug_ktr_clear, "I", "Clear KTR Buffer");
178 * This is a sysctl proc so that it is serialized as !MPSAFE along with
179 * the other ktr sysctl procs.
182 sysctl_debug_ktr_mask(SYSCTL_HANDLER_ARGS)
187 error = sysctl_handle_int(oidp, &mask, 0, req);
188 if (error || !req->newptr)
194 SYSCTL_PROC(_debug_ktr, OID_AUTO, mask, CTLTYPE_UINT|CTLFLAG_RW, 0, 0,
195 sysctl_debug_ktr_mask, "IU",
196 "Bitmask of KTR event classes for which logging is enabled");
198 #if KTR_ENTRIES > KTR_BOOT_ENTRIES
200 * A simplified version of sysctl_debug_ktr_entries.
201 * No need to care about SMP, scheduling, etc.
204 ktr_entries_initializer(void *dummy __unused)
208 /* Temporarily disable ktr in case malloc() is being traced. */
211 ktr_buf = malloc(sizeof(*ktr_buf) * KTR_ENTRIES, M_KTR,
213 memcpy(ktr_buf, ktr_buf_init + ktr_idx,
214 (KTR_BOOT_ENTRIES - ktr_idx) * sizeof(*ktr_buf));
216 memcpy(ktr_buf + KTR_BOOT_ENTRIES - ktr_idx, ktr_buf_init,
217 ktr_idx * sizeof(*ktr_buf));
218 ktr_entries = KTR_ENTRIES;
221 SYSINIT(ktr_entries_initializer, SI_SUB_KMEM, SI_ORDER_ANY,
222 ktr_entries_initializer, NULL);
226 sysctl_debug_ktr_entries(SYSCTL_HANDLER_ARGS)
228 int entries, error, mask;
229 struct ktr_entry *buf, *oldbuf;
231 entries = ktr_entries;
232 error = sysctl_handle_int(oidp, &entries, 0, req);
233 if (error || !req->newptr)
235 if (entries > KTR_ENTRIES_MAX)
237 /* Disable ktr temporarily. */
239 atomic_store_rel_int(&ktr_mask, 0);
240 /* Wait for threads to go idle. */
241 if ((error = quiesce_all_cpus("ktrent", PCATCH)) != 0) {
245 if (ktr_buf != ktr_buf_init)
249 /* Allocate a new buffer. */
250 buf = malloc(sizeof(*buf) * entries, M_KTR, M_WAITOK | M_ZERO);
251 /* Install the new buffer and restart ktr. */
253 ktr_entries = entries;
255 atomic_store_rel_int(&ktr_mask, mask);
262 SYSCTL_PROC(_debug_ktr, OID_AUTO, entries, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
263 sysctl_debug_ktr_entries, "I", "Number of entries in the KTR buffer");
266 int ktr_verbose = KTR_VERBOSE;
267 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
268 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
273 char ktr_alq_file[MAXPATHLEN] = "/tmp/ktr.out";
275 int ktr_alq_depth = KTR_ENTRIES;
276 int ktr_alq_enabled = 0;
277 int ktr_alq_failed = 0;
280 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_max, CTLFLAG_RW, &ktr_alq_max, 0,
281 "Maximum number of entries to write");
282 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_cnt, CTLFLAG_RD, &ktr_alq_cnt, 0,
283 "Current number of written entries");
284 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_failed, CTLFLAG_RD, &ktr_alq_failed, 0,
285 "Number of times we overran the buffer");
286 SYSCTL_INT(_debug_ktr, OID_AUTO, alq_depth, CTLFLAG_RW, &ktr_alq_depth, 0,
287 "Number of items in the write buffer");
288 SYSCTL_STRING(_debug_ktr, OID_AUTO, alq_file, CTLFLAG_RW, ktr_alq_file,
289 sizeof(ktr_alq_file), "KTR logging file");
292 sysctl_debug_ktr_alq_enable(SYSCTL_HANDLER_ARGS)
297 enable = ktr_alq_enabled;
299 error = sysctl_handle_int(oidp, &enable, 0, req);
300 if (error || !req->newptr)
306 error = alq_open(&ktr_alq, (const char *)ktr_alq_file,
307 req->td->td_ucred, ALQ_DEFAULT_CMODE,
308 sizeof(struct ktr_entry), ktr_alq_depth);
315 if (ktr_alq_enabled == 0)
324 SYSCTL_PROC(_debug_ktr, OID_AUTO, alq_enable,
325 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_debug_ktr_alq_enable,
326 "I", "Enable KTR logging");
330 ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
331 u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
334 struct ktr_entry *entry;
336 struct ale *ale = NULL;
338 int newindex, saveindex;
339 #if defined(KTR_VERBOSE) || defined(KTR_ALQ)
346 if ((ktr_mask & mask) == 0 || ktr_buf == NULL)
349 if (!CPU_ISSET(cpu, &ktr_cpumask))
351 #if defined(KTR_VERBOSE) || defined(KTR_ALQ)
353 if (td->td_pflags & TDP_INKTR)
355 td->td_pflags |= TDP_INKTR;
358 if (ktr_alq_enabled) {
359 if (td->td_critnest == 0 &&
360 (td->td_flags & TDF_IDLETD) == 0 &&
362 if (ktr_alq_max && ktr_alq_cnt > ktr_alq_max)
364 if ((ale = alq_get(ktr_alq, ALQ_NOWAIT)) == NULL) {
369 entry = (struct ktr_entry *)ale->ae_data;
378 newindex = (saveindex + 1) % ktr_entries;
379 } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
380 entry = &ktr_buf[saveindex];
382 entry->ktr_timestamp = KTR_TIME;
383 entry->ktr_cpu = cpu;
384 entry->ktr_thread = curthread;
386 while (strncmp(file, "../", 3) == 0)
388 entry->ktr_file = file;
389 entry->ktr_line = line;
393 printf("cpu%d ", cpu);
395 if (ktr_verbose > 1) {
396 printf("%s.%d\t", entry->ktr_file,
399 printf(format, arg1, arg2, arg3, arg4, arg5, arg6);
403 entry->ktr_desc = format;
404 entry->ktr_parms[0] = arg1;
405 entry->ktr_parms[1] = arg2;
406 entry->ktr_parms[2] = arg3;
407 entry->ktr_parms[3] = arg4;
408 entry->ktr_parms[4] = arg5;
409 entry->ktr_parms[5] = arg6;
411 if (ktr_alq_enabled && ale)
412 alq_post(ktr_alq, ale);
415 #if defined(KTR_VERBOSE) || defined(KTR_ALQ)
416 td->td_pflags &= ~TDP_INKTR;
426 static struct tstate tstate;
427 static int db_ktr_verbose;
428 static int db_mach_vtrace(void);
430 DB_SHOW_COMMAND(ktr, db_ktr_all)
433 tstate.cur = (ktr_idx - 1) % ktr_entries;
436 db_ktr_verbose |= (strchr(modif, 'v') != NULL) ? 2 : 0;
437 db_ktr_verbose |= (strchr(modif, 'V') != NULL) ? 1 : 0; /* just timestap please */
438 if (strchr(modif, 'a') != NULL) {
440 while (cncheckc() != -1)
441 if (db_mach_vtrace() == 0)
444 while (!db_pager_quit)
445 if (db_mach_vtrace() == 0)
453 struct ktr_entry *kp;
455 if (tstate.cur == tstate.first || ktr_buf == NULL) {
456 db_printf("--- End of trace buffer ---\n");
459 kp = &ktr_buf[tstate.cur];
461 /* Skip over unused entries. */
462 if (kp->ktr_desc == NULL) {
463 db_printf("--- End of trace buffer ---\n");
466 db_printf("%d (%p", tstate.cur, kp->ktr_thread);
468 db_printf(":cpu%d", kp->ktr_cpu);
471 if (db_ktr_verbose >= 1) {
472 db_printf(" %10.10lld", (long long)kp->ktr_timestamp);
474 if (db_ktr_verbose >= 2) {
475 db_printf(" %s.%d", kp->ktr_file, kp->ktr_line);
478 db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1],
479 kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4],
483 if (tstate.first == -1)
484 tstate.first = tstate.cur;
486 if (--tstate.cur < 0)
487 tstate.cur = ktr_entries - 1;