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freebsd-nq/sys/kern/kern_ktr.c
John Baldwin 7e1f6dfe9d Modify the critical section API as follows: 
- The MD functions critical_enter/exit are renamed to start with a cpu_
  prefix.
- MI wrapper functions critical_enter/exit maintain a per-thread nesting
  count and a per-thread critical section saved state set when entering
  a critical section while at nesting level 0 and restored when exiting
  to nesting level 0.  This moves the saved state out of spin mutexes so
  that interlocking spin mutexes works properly.
- Most low-level MD code that used critical_enter/exit now use
  cpu_critical_enter/exit.  MI code such as device drivers and spin
  mutexes use the MI wrappers.  Note that since the MI wrappers store
  the state in the current thread, they do not have any return values or
  arguments.
- mtx_intr_enable() is replaced with a constant CRITICAL_FORK which is
  assigned to curthread->td_savecrit during fork_exit().

Tested on:	i386, alpha
2001-12-18 00:27:18 +00:00

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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 JOHN BALDWIN 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 JOHN BALDWIN 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_ddb.h"
#include "opt_ktr.h"
#include <sys/param.h>
#include <sys/cons.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/libkern.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <machine/stdarg.h>
#include <ddb/ddb.h>
#ifndef KTR_ENTRIES
#define KTR_ENTRIES 1024
#endif
#ifndef KTR_MASK
#define KTR_MASK (KTR_GEN)
#endif
#ifndef KTR_CPUMASK
#define KTR_CPUMASK (~0)
#endif
#ifdef SMP
#define KTR_CPU PCPU_GET(cpuid)
#else
#define KTR_CPU 0
#endif
#ifdef KTR_EXTEND
#define KTR_EXTEND_DEFAULT 1
#else
#define KTR_EXTEND_DEFAULT 0
#endif
#ifdef KTR_VERBOSE
#define KTR_VERBOSE_DEFAULT 1
#else
#define KTR_VERBOSE_DEFAULT 0
#endif
SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
/*
* This variable is used only by gdb to work out what fields are in
* ktr_entry.
*/
int ktr_extend = KTR_EXTEND_DEFAULT;
SYSCTL_INT(_debug_ktr, OID_AUTO, extend, CTLFLAG_RD, &ktr_extend, 0, "");
int ktr_cpumask = KTR_CPUMASK;
TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
int ktr_mask = KTR_MASK;
TUNABLE_INT("debug.ktr.mask", &ktr_mask);
SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, "");
int ktr_entries = KTR_ENTRIES;
SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
volatile int ktr_idx = 0;
struct ktr_entry ktr_buf[KTR_ENTRIES];
int ktr_verbose = KTR_VERBOSE_DEFAULT;
TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
#ifdef KTR
#ifdef KTR_EXTEND
void
ktr_tracepoint(u_int mask, const char *filename, u_int line,
const char *format, ...)
#else
void
ktr_tracepoint(u_int mask, const char *format, u_long arg1, u_long arg2,
u_long arg3, u_long arg4, u_long arg5, u_long arg6)
#endif
{
struct ktr_entry *entry;
int newindex, saveindex;
critical_t savecrit;
struct thread *td;
#ifdef KTR_EXTEND
va_list ap;
#endif
if (panicstr)
return;
if ((ktr_mask & mask) == 0)
return;
td = curthread;
if (td->td_inktr)
return;
savecrit = cpu_critical_enter();
if (((1 << KTR_CPU) & ktr_cpumask) == 0) {
cpu_critical_exit(savecrit);
return;
}
td->td_inktr++;
do {
saveindex = ktr_idx;
newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
entry = &ktr_buf[saveindex];
entry->ktr_cpu = KTR_CPU;
cpu_critical_exit(savecrit);
nanotime(&entry->ktr_tv);
#ifdef KTR_EXTEND
entry->ktr_filename = filename;
entry->ktr_line = line;
va_start(ap, format);
vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
va_end(ap);
if (ktr_verbose) {
#ifdef SMP
printf("cpu%d ", entry->ktr_cpu);
#endif
if (ktr_verbose > 1)
printf("%s.%d\t", entry->ktr_filename, entry->ktr_line);
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;
entry->ktr_parm6 = arg6;
#endif
td->td_inktr--;
}
#ifdef DDB
struct tstate {
int cur;
int first;
};
static struct tstate tstate;
static int db_ktr_verbose;
static int db_mach_vtrace(void);
#define NUM_LINES_PER_PAGE 18
DB_SHOW_COMMAND(ktr, db_ktr_all)
{
int c, lines;
lines = NUM_LINES_PER_PAGE;
tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1);
tstate.first = -1;
if (strcmp(modif, "v") == 0)
db_ktr_verbose = 1;
else
db_ktr_verbose = 0;
while (db_mach_vtrace())
if (--lines == 0) {
db_printf("--More--");
c = cngetc();
db_printf("\r");
switch (c) {
case '\n': /* one more line */
lines = 1;
break;
case ' ': /* one more page */
lines = NUM_LINES_PER_PAGE;
break;
default:
db_printf("\n");
return;
}
}
}
static int
db_mach_vtrace(void)
{
struct ktr_entry *kp;
if (tstate.cur == tstate.first) {
db_printf("--- End of trace buffer ---\n");
return (0);
}
kp = &ktr_buf[tstate.cur];
/* Skip over unused entries. */
#ifdef KTR_EXTEND
if (kp->ktr_desc[0] == '\0') {
#else
if (kp->ktr_desc == NULL) {
#endif
db_printf("--- End of trace buffer ---\n");
return (0);
}
db_printf("%d: ", tstate.cur);
if (db_ktr_verbose)
db_printf("%4ld.%06ld ", (long)kp->ktr_tv.tv_sec,
kp->ktr_tv.tv_nsec / 1000);
#ifdef KTR_EXTEND
#ifdef SMP
db_printf("cpu%d ", kp->ktr_cpu);
#endif
if (db_ktr_verbose)
db_printf("%s.%d\t", kp->ktr_filename, kp->ktr_line);
db_printf("%s", kp->ktr_desc);
#else
db_printf(kp->ktr_desc, kp->ktr_parm1, kp->ktr_parm2, kp->ktr_parm3,
kp->ktr_parm4, kp->ktr_parm5);
#endif
db_printf("\n");
if (tstate.first == -1)
tstate.first = tstate.cur;
if (--tstate.cur < 0)
tstate.cur = KTR_ENTRIES - 1;
return (1);
}
#endif /* DDB */
#endif /* KTR */
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