269 lines
6.5 KiB
C
269 lines
6.5 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/cons.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/libkern.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <machine/stdarg.h>
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#include <ddb/ddb.h>
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#ifndef KTR_ENTRIES
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#define KTR_ENTRIES 1024
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#endif
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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 PCPU_GET(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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#define KTR_EXTEND_DEFAULT 1
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#else
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#define KTR_EXTEND_DEFAULT 0
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#endif
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#ifdef KTR_VERBOSE
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#define KTR_VERBOSE_DEFAULT 1
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#else
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#define KTR_VERBOSE_DEFAULT 0
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#endif
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SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
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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 = KTR_EXTEND_DEFAULT;
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SYSCTL_INT(_debug_ktr, OID_AUTO, extend, CTLFLAG_RD, &ktr_extend, 0, "");
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int ktr_cpumask = KTR_CPUMASK;
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TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
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SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
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int ktr_mask = KTR_MASK;
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TUNABLE_INT("debug.ktr.mask", &ktr_mask);
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SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, "");
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int ktr_entries = KTR_ENTRIES;
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SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
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volatile int ktr_idx = 0;
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struct ktr_entry ktr_buf[KTR_ENTRIES];
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int ktr_verbose = KTR_VERBOSE_DEFAULT;
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TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
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SYSCTL_INT(_debug_ktr, OID_AUTO, 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, const char *filename, u_int line,
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const char *format, ...)
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#else
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void
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ktr_tracepoint(u_int mask, const char *format, u_long arg1, u_long arg2,
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u_long arg3, u_long arg4, u_long arg5, u_long arg6)
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#endif
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{
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struct ktr_entry *entry;
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int newindex, saveindex;
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critical_t savecrit;
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struct thread *td;
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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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td = curthread;
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if (td->td_inktr)
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return;
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savecrit = cpu_critical_enter();
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if (((1 << KTR_CPU) & ktr_cpumask) == 0) {
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cpu_critical_exit(savecrit);
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return;
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}
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td->td_inktr++;
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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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entry->ktr_cpu = KTR_CPU;
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cpu_critical_exit(savecrit);
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nanotime(&entry->ktr_tv);
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#ifdef KTR_EXTEND
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entry->ktr_filename = filename;
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entry->ktr_line = line;
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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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entry->ktr_parm6 = arg6;
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#endif
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td->td_inktr--;
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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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#define NUM_LINES_PER_PAGE 18
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DB_SHOW_COMMAND(ktr, db_ktr_all)
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{
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int c, lines;
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lines = NUM_LINES_PER_PAGE;
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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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while (db_mach_vtrace())
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if (--lines == 0) {
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db_printf("--More--");
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c = cngetc();
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db_printf("\r");
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switch (c) {
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case '\n': /* one more line */
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lines = 1;
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break;
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case ' ': /* one more page */
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lines = NUM_LINES_PER_PAGE;
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break;
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default:
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db_printf("\n");
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return;
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}
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}
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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("--- End of trace buffer ---\n");
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return (0);
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}
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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 ", (long)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, kp->ktr_parm3,
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kp->ktr_parm4, kp->ktr_parm5, kp->ktr_parm6);
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#endif
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db_printf("\n");
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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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