603a2512a3
changing or overwriting the trace buffer. When KTR is enabled for things like traps or pmap functions, the amount of logging can be substantial.
476 lines
12 KiB
C
476 lines
12 KiB
C
/*-
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* Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/queue.h>
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#include <sys/alq.h>
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#include <sys/cons.h>
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#include <sys/cpuset.h>
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#include <sys/kdb.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/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/smp.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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#ifdef DDB
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#include <ddb/ddb.h>
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#include <ddb/db_output.h>
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#endif
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#ifndef KTR_BOOT_ENTRIES
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#define KTR_BOOT_ENTRIES 1024
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#endif
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#ifndef KTR_ENTRIES
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#define KTR_ENTRIES 1024
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#endif
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/* Limit the allocations to something manageable. */
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#define KTR_ENTRIES_MAX (8 * 1024 * 1024)
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#ifndef KTR_MASK
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#define KTR_MASK (0)
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#endif
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#ifndef KTR_CPUMASK
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#define KTR_CPUMASK CPUSET_FSET
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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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static MALLOC_DEFINE(M_KTR, "KTR", "KTR");
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FEATURE(ktr, "Kernel support for KTR kernel tracing facility");
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volatile int ktr_idx = 0;
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int ktr_mask = KTR_MASK;
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int ktr_compile = KTR_COMPILE;
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int ktr_entries = KTR_BOOT_ENTRIES;
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int ktr_version = KTR_VERSION;
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struct ktr_entry ktr_buf_init[KTR_BOOT_ENTRIES];
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struct ktr_entry *ktr_buf = ktr_buf_init;
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cpuset_t ktr_cpumask = CPUSET_T_INITIALIZER(KTR_CPUMASK);
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static SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
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SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD,
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&ktr_version, 0, "Version of the KTR interface");
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SYSCTL_UINT(_debug_ktr, OID_AUTO, compile, CTLFLAG_RD,
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&ktr_compile, 0, "Bitmask of KTR event classes compiled into the kernel");
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static int
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sysctl_debug_ktr_cpumask(SYSCTL_HANDLER_ARGS)
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{
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char lktr_cpumask_str[CPUSETBUFSIZ];
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cpuset_t imask;
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int error;
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cpusetobj_strprint(lktr_cpumask_str, &ktr_cpumask);
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error = sysctl_handle_string(oidp, lktr_cpumask_str,
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sizeof(lktr_cpumask_str), req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (cpusetobj_strscan(&imask, lktr_cpumask_str) == -1)
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return (EINVAL);
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CPU_COPY(&imask, &ktr_cpumask);
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, cpumask,
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CTLFLAG_RWTUN | CTLFLAG_MPSAFE | CTLTYPE_STRING, NULL, 0,
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sysctl_debug_ktr_cpumask, "S",
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"Bitmask of CPUs on which KTR logging is enabled");
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static int
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sysctl_debug_ktr_clear(SYSCTL_HANDLER_ARGS)
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{
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int clear, error;
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clear = 0;
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error = sysctl_handle_int(oidp, &clear, 0, req);
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if (error || !req->newptr)
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return (error);
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if (clear) {
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bzero(ktr_buf, sizeof(*ktr_buf) * ktr_entries);
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ktr_idx = 0;
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}
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, clear, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
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sysctl_debug_ktr_clear, "I", "Clear KTR Buffer");
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/*
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* This is a sysctl proc so that it is serialized as !MPSAFE along with
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* the other ktr sysctl procs.
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*/
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static int
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sysctl_debug_ktr_mask(SYSCTL_HANDLER_ARGS)
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{
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int mask, error;
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mask = ktr_mask;
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error = sysctl_handle_int(oidp, &mask, 0, req);
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if (error || !req->newptr)
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return (error);
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ktr_mask = mask;
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, mask, CTLTYPE_UINT|CTLFLAG_RWTUN, 0, 0,
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sysctl_debug_ktr_mask, "IU",
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"Bitmask of KTR event classes for which logging is enabled");
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#if KTR_ENTRIES > KTR_BOOT_ENTRIES
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/*
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* A simplified version of sysctl_debug_ktr_entries.
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* No need to care about SMP, scheduling, etc.
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*/
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static void
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ktr_entries_initializer(void *dummy __unused)
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{
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int mask;
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/* Temporarily disable ktr in case malloc() is being traced. */
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mask = ktr_mask;
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ktr_mask = 0;
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ktr_buf = malloc(sizeof(*ktr_buf) * KTR_ENTRIES, M_KTR,
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M_WAITOK | M_ZERO);
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memcpy(ktr_buf, ktr_buf_init + ktr_idx,
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(KTR_BOOT_ENTRIES - ktr_idx) * sizeof(*ktr_buf));
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if (ktr_idx != 0) {
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memcpy(ktr_buf + KTR_BOOT_ENTRIES - ktr_idx, ktr_buf_init,
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ktr_idx * sizeof(*ktr_buf));
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ktr_idx = KTR_BOOT_ENTRIES;
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}
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ktr_entries = KTR_ENTRIES;
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ktr_mask = mask;
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}
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SYSINIT(ktr_entries_initializer, SI_SUB_KMEM, SI_ORDER_ANY,
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ktr_entries_initializer, NULL);
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#endif
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static int
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sysctl_debug_ktr_entries(SYSCTL_HANDLER_ARGS)
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{
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int entries, error, mask;
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struct ktr_entry *buf, *oldbuf;
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entries = ktr_entries;
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error = sysctl_handle_int(oidp, &entries, 0, req);
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if (error || !req->newptr)
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return (error);
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if (entries > KTR_ENTRIES_MAX)
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return (ERANGE);
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/* Disable ktr temporarily. */
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mask = ktr_mask;
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atomic_store_rel_int(&ktr_mask, 0);
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/* Wait for threads to go idle. */
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if ((error = quiesce_all_cpus("ktrent", PCATCH)) != 0) {
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ktr_mask = mask;
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return (error);
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}
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if (ktr_buf != ktr_buf_init)
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oldbuf = ktr_buf;
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else
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oldbuf = NULL;
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/* Allocate a new buffer. */
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buf = malloc(sizeof(*buf) * entries, M_KTR, M_WAITOK | M_ZERO);
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/* Install the new buffer and restart ktr. */
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ktr_buf = buf;
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ktr_entries = entries;
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ktr_idx = 0;
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atomic_store_rel_int(&ktr_mask, mask);
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if (oldbuf != NULL)
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free(oldbuf, M_KTR);
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return (error);
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}
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SYSCTL_PROC(_debug_ktr, OID_AUTO, entries, CTLTYPE_INT|CTLFLAG_RW, 0, 0,
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sysctl_debug_ktr_entries, "I", "Number of entries in the KTR buffer");
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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 = alq_open(&ktr_alq, (const char *)ktr_alq_file,
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req->td->td_ucred, ALQ_DEFAULT_CMODE,
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sizeof(struct ktr_entry), ktr_alq_depth);
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if (error == 0) {
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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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#endif
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int newindex, saveindex;
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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 || kdb_active)
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return;
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if ((ktr_mask & mask) == 0 || ktr_buf == NULL)
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return;
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cpu = KTR_CPU;
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if (!CPU_ISSET(cpu, &ktr_cpumask))
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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_pflags & TDP_INKTR)
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return;
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td->td_pflags |= TDP_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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if (td->td_critnest == 0 &&
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(td->td_flags & TDF_IDLETD) == 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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}
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} else
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#endif
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{
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do {
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saveindex = ktr_idx;
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newindex = (saveindex + 1) % ktr_entries;
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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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}
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entry->ktr_timestamp = KTR_TIME;
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entry->ktr_cpu = cpu;
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entry->ktr_thread = curthread;
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if (file != NULL)
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while (strncmp(file, "../", 3) == 0)
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file += 3;
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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 (ktr_alq_enabled && 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_pflags &= ~TDP_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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DB_SHOW_COMMAND(ktr, db_ktr_all)
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{
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tstate.cur = (ktr_idx - 1) % ktr_entries;
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tstate.first = -1;
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db_ktr_verbose = 0;
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db_ktr_verbose |= (strchr(modif, 'v') != NULL) ? 2 : 0;
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db_ktr_verbose |= (strchr(modif, 'V') != NULL) ? 1 : 0; /* just timestap please */
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if (strchr(modif, 'a') != NULL) {
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db_disable_pager();
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while (cncheckc() != -1)
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if (db_mach_vtrace() == 0)
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break;
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} else {
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while (!db_pager_quit)
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if (db_mach_vtrace() == 0)
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break;
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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 || ktr_buf == 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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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 (%p", tstate.cur, kp->ktr_thread);
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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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db_printf(")");
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if (db_ktr_verbose >= 1) {
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db_printf(" %10.10lld", (long long)kp->ktr_timestamp);
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}
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if (db_ktr_verbose >= 2) {
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db_printf(" %s.%d", kp->ktr_file, kp->ktr_line);
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}
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db_printf(": ");
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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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