de3622188a
commands have also been slightly updated as follows: - Use ktr_idx to find the newest entry rather than walking the buffer comparing timespecs. Timespecs are not always unique after the change to use getnanotime(9). - Add a new verbose setting. When the verbose setting is on, then the timestamp is printed with each message. If KTR_EXTEND is on, then the filename and line number are output as well. By default this option is off. It can be turned on with the 'v' modifier passed to the 'tbuf' and 'tall' commands. For the 'tnext' command, the 'v' modifier toggles the verbose mode. - Only display the cpu number for each message on SMP systems. - Don't display anything for an empty entry that hasn't been used yet.
253 lines
6.0 KiB
C
253 lines
6.0 KiB
C
/*
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* Copyright (c) 2000
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* John Baldwin <jhb@FreeBSD.org>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BALDWIN AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JOHN BALDWIN OR THE VOICES IN HIS HEAD
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This module holds the global variables used by KTR and the ktr_tracepoint()
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* function that does the actual tracing.
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*/
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#include "opt_ddb.h"
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#include "opt_ktr.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/cons.h>
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#include <sys/time.h>
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#include <sys/ktr.h>
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#include <sys/libkern.h>
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#include <sys/linker_set.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <machine/globals.h>
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#include <machine/stdarg.h>
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#include <ddb/ddb.h>
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#ifndef KTR_MASK
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#define KTR_MASK (KTR_GEN)
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#endif
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#ifndef KTR_CPUMASK
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#define KTR_CPUMASK (~0)
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#endif
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#ifdef SMP
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#define KTR_CPU cpuid
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#else
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#define KTR_CPU 0
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#endif
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#ifdef KTR_EXTEND
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/*
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* This variable is used only by gdb to work out what fields are in
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* ktr_entry.
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*/
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int ktr_extend = 1;
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SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, "");
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#else
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int ktr_extend = 0;
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SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, "");
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#endif /* KTR_EXTEND */
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int ktr_cpumask = KTR_CPUMASK;
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SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, "");
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int ktr_mask = KTR_MASK;
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SYSCTL_INT(_debug, OID_AUTO, ktr_mask, CTLFLAG_RW, &ktr_mask, KTR_MASK, "");
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int ktr_entries = KTR_ENTRIES;
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SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES, "");
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volatile int ktr_idx = 0;
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struct ktr_entry ktr_buf[KTR_ENTRIES];
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#ifdef KTR_VERBOSE
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int ktr_verbose = 1;
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#else
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int ktr_verbose = 0;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
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#ifdef KTR
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#ifdef KTR_EXTEND
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void
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ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...)
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#else
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void
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ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3,
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u_long arg4, u_long arg5)
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#endif
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{
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struct ktr_entry *entry;
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int newindex, saveindex, saveintr;
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#ifdef KTR_EXTEND
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va_list ap;
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#endif
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if (panicstr)
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return;
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if ((ktr_mask & mask) == 0)
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return;
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#ifdef KTR_EXTEND
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if (((1 << KTR_CPU) & ktr_cpumask) == 0)
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return;
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#endif
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saveintr = save_intr();
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disable_intr();
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do {
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saveindex = ktr_idx;
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newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
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} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
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entry = &ktr_buf[saveindex];
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restore_intr(saveintr);
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getnanotime(&entry->ktr_tv);
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#ifdef KTR_EXTEND
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strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1);
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entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0';
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entry->ktr_line = line;
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entry->ktr_cpu = KTR_CPU;
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va_start(ap, format);
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vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
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va_end(ap);
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if (ktr_verbose) {
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#ifdef SMP
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printf("cpu%d ", entry->ktr_cpu);
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#endif
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if (ktr_verbose > 1)
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printf("%s.%d\t", entry->ktr_filename, entry->ktr_line);
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va_start(ap, format);
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vprintf(format, ap);
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printf("\n");
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va_end(ap);
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}
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#else
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entry->ktr_desc = format;
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entry->ktr_parm1 = arg1;
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entry->ktr_parm2 = arg2;
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entry->ktr_parm3 = arg3;
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entry->ktr_parm4 = arg4;
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entry->ktr_parm5 = arg5;
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#endif
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}
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#ifdef DDB
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struct tstate {
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int cur;
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int first;
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};
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static struct tstate tstate;
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static int db_ktr_verbose;
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static int db_mach_vtrace(void);
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DB_COMMAND(tbuf, db_mach_tbuf)
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{
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tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1);
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tstate.first = -1;
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if (strcmp(modif, "v") == 0)
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db_ktr_verbose = 1;
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else
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db_ktr_verbose = 0;
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db_mach_vtrace();
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return;
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}
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DB_COMMAND(tall, db_mach_tall)
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{
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int c;
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db_mach_tbuf(addr, have_addr, count, modif);
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while (db_mach_vtrace()) {
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c = cncheckc();
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if (c != -1)
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break;
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}
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return;
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}
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DB_COMMAND(tnext, db_mach_tnext)
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{
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if (strcmp(modif, "v") == 0)
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db_ktr_verbose ^= 1;
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db_mach_vtrace();
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}
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static int
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db_mach_vtrace(void)
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{
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struct ktr_entry *kp;
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if (tstate.cur == tstate.first) {
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db_printf("--- End of trace buffer ---\n");
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return (0);
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}
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kp = &ktr_buf[tstate.cur];
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/* Skip over unused entries. */
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#ifdef KTR_EXTEND
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if (kp->ktr_desc[0] != '\0') {
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#else
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if (kp->ktr_desc != NULL) {
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#endif
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db_printf("%d: ", tstate.cur);
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if (db_ktr_verbose)
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db_printf("%4ld.%06ld ", kp->ktr_tv.tv_sec,
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kp->ktr_tv.tv_nsec / 1000);
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#ifdef KTR_EXTEND
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#ifdef SMP
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db_printf("cpu%d ", kp->ktr_cpu);
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#endif
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if (db_ktr_verbose)
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db_printf("%s.%d\t", kp->ktr_filename, kp->ktr_line);
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db_printf("%s", kp->ktr_desc);
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#else
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db_printf(kp->ktr_desc, kp->ktr_parm1, kp->ktr_parm2,
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kp->ktr_parm3, kp->ktr_parm4, kp->ktr_parm5);
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#endif
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db_printf("\n");
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}
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if (tstate.first == -1)
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tstate.first = tstate.cur;
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if (--tstate.cur < 0)
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tstate.cur = KTR_ENTRIES - 1;
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return (1);
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}
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#endif /* DDB */
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#endif /* KTR */
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