332 lines
8.1 KiB
C
332 lines
8.1 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 "opt_alq.h"
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#include <sys/param.h>
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#include <sys/alq.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/cpu.h>
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#ifdef __sparc64__
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#include <machine/ktr.h>
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#endif
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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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#ifndef KTR_TIME
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#define KTR_TIME get_cyclecount()
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#endif
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#ifndef KTR_CPU
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#define KTR_CPU PCPU_GET(cpuid)
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#endif
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SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
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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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int ktr_version = KTR_VERSION;
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SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 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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#ifdef KTR_VERBOSE
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int ktr_verbose = KTR_VERBOSE;
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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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#endif
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#ifdef KTR_ALQ
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struct alq *ktr_alq;
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char ktr_alq_file[MAXPATHLEN] = "/tmp/ktr.out";
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int ktr_alq_cnt = 0;
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int ktr_alq_depth = KTR_ENTRIES;
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int ktr_alq_enabled = 0;
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int ktr_alq_failed = 0;
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int ktr_alq_max = 0;
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_max, CTLFLAG_RW, &ktr_alq_max, 0,
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"Maximum number of entries to write");
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_cnt, CTLFLAG_RD, &ktr_alq_cnt, 0,
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"Current number of written entries");
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_failed, CTLFLAG_RD, &ktr_alq_failed, 0,
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"Number of times we overran the buffer");
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SYSCTL_INT(_debug_ktr, OID_AUTO, alq_depth, CTLFLAG_RW, &ktr_alq_depth, 0,
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"Number of items in the write buffer");
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SYSCTL_STRING(_debug_ktr, OID_AUTO, alq_file, CTLFLAG_RW, ktr_alq_file,
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sizeof(ktr_alq_file), "KTR logging file");
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static int
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sysctl_debug_ktr_alq_enable(SYSCTL_HANDLER_ARGS)
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{
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int error;
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int enable;
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enable = ktr_alq_enabled;
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error = sysctl_handle_int(oidp, &enable, 0, req);
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if (error || !req->newptr)
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return (error);
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if (enable) {
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if (ktr_alq_enabled)
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return (0);
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error = suser(curthread);
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if (error)
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return (error);
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error = alq_open(&ktr_alq, (const char *)ktr_alq_file,
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sizeof(struct ktr_entry), ktr_alq_depth);
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if (error == 0) {
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ktr_mask &= ~KTR_ALQ_MASK;
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ktr_alq_cnt = 0;
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ktr_alq_failed = 0;
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ktr_alq_enabled = 1;
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}
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} else {
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if (ktr_alq_enabled == 0)
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return (0);
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ktr_alq_enabled = 0;
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alq_close(ktr_alq);
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ktr_alq = NULL;
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}
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, alq_enable,
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CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_debug_ktr_alq_enable,
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"I", "Enable KTR logging");
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#endif
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void
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ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
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u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
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u_long arg6)
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{
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struct ktr_entry *entry;
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#ifdef KTR_ALQ
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struct ale *ale = NULL;
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#else
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int newindex, saveindex;
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#endif
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#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
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struct thread *td;
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#endif
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int cpu;
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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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cpu = KTR_CPU;
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if (((1 << cpu) & ktr_cpumask) == 0)
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return;
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#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
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td = curthread;
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if (td->td_inktr)
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return;
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td->td_inktr++;
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#endif
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#ifdef KTR_ALQ
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if (ktr_alq_enabled &&
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td->td_critnest == 0 &&
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(td->td_kse->ke_flags & KEF_IDLEKSE) == 0 &&
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td != ald_thread) {
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if (ktr_alq_max && ktr_alq_cnt > ktr_alq_max)
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goto done;
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if ((ale = alq_get(ktr_alq, ALQ_NOWAIT)) == NULL) {
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ktr_alq_failed++;
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goto done;
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}
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ktr_alq_cnt++;
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entry = (struct ktr_entry *)ale->ae_data;
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} else
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goto done;
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#else
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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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#endif
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entry->ktr_timestamp = KTR_TIME;
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entry->ktr_cpu = cpu;
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entry->ktr_file = file;
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entry->ktr_line = line;
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#ifdef KTR_VERBOSE
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if (ktr_verbose) {
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#ifdef SMP
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printf("cpu%d ", cpu);
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#endif
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if (ktr_verbose > 1) {
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printf("%s.%d\t", entry->ktr_file,
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entry->ktr_line);
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}
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printf(format, arg1, arg2, arg3, arg4, arg5, arg6);
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printf("\n");
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}
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#endif
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entry->ktr_desc = format;
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entry->ktr_parms[0] = arg1;
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entry->ktr_parms[1] = arg2;
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entry->ktr_parms[2] = arg3;
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entry->ktr_parms[3] = arg4;
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entry->ktr_parms[4] = arg5;
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entry->ktr_parms[5] = arg6;
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#ifdef KTR_ALQ
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if (ale)
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alq_post(ktr_alq, ale);
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done:
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#endif
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#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
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td->td_inktr--;
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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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#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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if (kp->ktr_desc == NULL) {
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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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#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("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp,
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kp->ktr_file, kp->ktr_line);
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}
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db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1],
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kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4],
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kp->ktr_parms[5]);
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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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