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/*
* Copyright (c) 2000
* John Baldwin <jhb@FreeBSD.org>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* This module holds the global variables used by KTR and the ktr_tracepoint()
* function that does the actual tracing.
*/
#include "opt_ktr.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ktr.h>
#include <sys/libkern.h>
#include <sys/linker_set.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <machine/globals.h>
#include <machine/stdarg.h>
#ifndef KTR_MASK
#define KTR_MASK (KTR_GEN)
#endif
#ifndef KTR_CPUMASK
#define KTR_CPUMASK (~0)
#endif
#ifdef SMP
#define KTR_CPU cpuid
#else
#define KTR_CPU 0
#endif
#ifdef KTR_EXTEND
/*
* This variable is used only by gdb to work out what fields are in
* ktr_entry.
*/
int ktr_extend = 1;
SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, "");
#else
int ktr_extend = 0;
SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, "");
#endif /* KTR_EXTEND */
int ktr_cpumask = KTR_CPUMASK;
SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, "");
int ktr_mask = KTR_MASK;
SYSCTL_INT(_debug, OID_AUTO, ktr_mask, CTLFLAG_RW, &ktr_mask, KTR_MASK, "");
int ktr_entries = KTR_ENTRIES;
SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES, "");
volatile int ktr_idx = 0;
struct ktr_entry ktr_buf[KTR_ENTRIES];
#ifdef KTR_VERBOSE
int ktr_verbose = 1;
#else
int ktr_verbose = 0;
#endif
SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
#ifdef KTR
#ifdef KTR_EXTEND
void
ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...)
#else
void
ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3,
u_long arg4, u_long arg5)
#endif
{
struct ktr_entry *entry;
int newindex, saveindex, saveintr;
#ifdef KTR_EXTEND
va_list ap;
#endif
if ((ktr_mask & mask) == 0)
return;
#ifdef KTR_EXTEND
if (((1 << KTR_CPU) & ktr_cpumask) == 0)
return;
#endif
saveintr = save_intr();
disable_intr();
do {
saveindex = ktr_idx;
newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
entry = &ktr_buf[saveindex];
restore_intr(saveintr);
nanotime(&entry->ktr_tv);
#ifdef KTR_EXTEND
strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1);
entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0';
snprintf(entry->ktr_filename, KTRFILENAMESIZE, "%s", __FILE__);
entry->ktr_line = line;
entry->ktr_cpu = KTR_CPU;
va_start(ap, format);
vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
va_end(ap);
if (ktr_verbose) {
va_start(ap, format);
vprintf(format, ap);
printf("\n");
va_end(ap);
}
#else
entry->ktr_desc = format;
entry->ktr_parm1 = arg1;
entry->ktr_parm2 = arg2;
entry->ktr_parm3 = arg3;
entry->ktr_parm4 = arg4;
entry->ktr_parm5 = arg5;
#endif
}
#endif /* KTR */
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