kern_ktr.c revision 70035
1/* 2 * Copyright (c) 2000 3 * John Baldwin <jhb@FreeBSD.org>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY JOHN BALDWIN AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL JOHN BALDWIN OR THE VOICES IN HIS HEAD 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD: head/sys/kern/kern_ktr.c 70035 2000-12-15 00:01:20Z jhb $ 30 */ 31 32/* 33 * This module holds the global variables used by KTR and the ktr_tracepoint() 34 * function that does the actual tracing. 35 */ 36 37#include "opt_ddb.h" 38#include "opt_ktr.h" 39 40#include <sys/param.h> 41#include <sys/types.h> 42#include <sys/cons.h> 43#include <sys/time.h> 44#include <sys/ktr.h> 45#include <sys/libkern.h> 46#include <sys/linker_set.h> 47#include <sys/sysctl.h> 48#include <sys/systm.h> 49#include <machine/globals.h> 50#include <machine/stdarg.h> 51 52#include <ddb/ddb.h> 53 54#ifndef KTR_MASK 55#define KTR_MASK (KTR_GEN) 56#endif 57 58#ifndef KTR_CPUMASK 59#define KTR_CPUMASK (~0) 60#endif 61 62#ifdef SMP 63#define KTR_CPU cpuid 64#else 65#define KTR_CPU 0 66#endif 67 68#ifdef KTR_EXTEND 69/* 70 * This variable is used only by gdb to work out what fields are in 71 * ktr_entry. 72 */ 73int ktr_extend = 1; 74SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, ""); 75#else 76int ktr_extend = 0; 77SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, ""); 78#endif /* KTR_EXTEND */ 79 80int ktr_cpumask = KTR_CPUMASK; 81SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, ""); 82 83int ktr_mask = KTR_MASK; 84SYSCTL_INT(_debug, OID_AUTO, ktr_mask, CTLFLAG_RW, &ktr_mask, KTR_MASK, ""); 85 86int ktr_entries = KTR_ENTRIES; 87SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES, ""); 88 89volatile int ktr_idx = 0; 90struct ktr_entry ktr_buf[KTR_ENTRIES]; 91 92#ifdef KTR_VERBOSE 93int ktr_verbose = 1; 94#else 95int ktr_verbose = 0; 96#endif 97SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); 98 99#ifdef KTR 100#ifdef KTR_EXTEND 101void 102ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...) 103#else 104void 105ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3, 106 u_long arg4, u_long arg5) 107#endif 108{ 109 struct ktr_entry *entry; 110 int newindex, saveindex, saveintr; 111#ifdef KTR_EXTEND 112 va_list ap; 113#endif 114 115 if (panicstr) 116 return; 117 if ((ktr_mask & mask) == 0) 118 return; 119#ifdef KTR_EXTEND 120 if (((1 << KTR_CPU) & ktr_cpumask) == 0) 121 return; 122#endif 123 saveintr = save_intr(); 124 disable_intr(); 125 do { 126 saveindex = ktr_idx; 127 newindex = (saveindex + 1) & (KTR_ENTRIES - 1); 128 } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0); 129 entry = &ktr_buf[saveindex]; 130 restore_intr(saveintr); 131 getnanotime(&entry->ktr_tv); 132#ifdef KTR_EXTEND 133 strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1); 134 entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0'; 135 entry->ktr_line = line; 136 entry->ktr_cpu = KTR_CPU; 137 va_start(ap, format); 138 vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap); 139 va_end(ap); 140 if (ktr_verbose) { 141#ifdef SMP 142 printf("cpu%d ", entry->ktr_cpu); 143#endif 144 if (ktr_verbose > 1) 145 printf("%s.%d\t", entry->ktr_filename, entry->ktr_line); 146 va_start(ap, format); 147 vprintf(format, ap); 148 printf("\n"); 149 va_end(ap); 150 } 151#else 152 entry->ktr_desc = format; 153 entry->ktr_parm1 = arg1; 154 entry->ktr_parm2 = arg2; 155 entry->ktr_parm3 = arg3; 156 entry->ktr_parm4 = arg4; 157 entry->ktr_parm5 = arg5; 158#endif 159} 160 161#ifdef DDB 162 163struct tstate { 164 int cur; 165 int first; 166}; 167static struct tstate tstate; 168static int db_ktr_verbose; 169static int db_mach_vtrace(void); 170 171DB_COMMAND(tbuf, db_mach_tbuf) 172{ 173 174 tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1); 175 tstate.first = -1; 176 if (strcmp(modif, "v") == 0) 177 db_ktr_verbose = 1; 178 else 179 db_ktr_verbose = 0; 180 db_mach_vtrace(); 181 182 return; 183} 184 185DB_COMMAND(tall, db_mach_tall) 186{ 187 int c; 188 189 db_mach_tbuf(addr, have_addr, count, modif); 190 while (db_mach_vtrace()) { 191 c = cncheckc(); 192 if (c != -1) 193 break; 194 } 195 196 return; 197} 198 199DB_COMMAND(tnext, db_mach_tnext) 200{ 201 202 if (strcmp(modif, "v") == 0) 203 db_ktr_verbose ^= 1; 204 db_mach_vtrace(); 205} 206 207static int 208db_mach_vtrace(void) 209{ 210 struct ktr_entry *kp; 211 212 if (tstate.cur == tstate.first) { 213 db_printf("--- End of trace buffer ---\n"); 214 return (0); 215 } 216 kp = &ktr_buf[tstate.cur]; 217 218 /* Skip over unused entries. */ 219#ifdef KTR_EXTEND 220 if (kp->ktr_desc[0] != '\0') { 221#else 222 if (kp->ktr_desc != NULL) { 223#endif 224 db_printf("%d: ", tstate.cur); 225 if (db_ktr_verbose) 226 db_printf("%4ld.%06ld ", kp->ktr_tv.tv_sec, 227 kp->ktr_tv.tv_nsec / 1000); 228#ifdef KTR_EXTEND 229#ifdef SMP 230 db_printf("cpu%d ", kp->ktr_cpu); 231#endif 232 if (db_ktr_verbose) 233 db_printf("%s.%d\t", kp->ktr_filename, kp->ktr_line); 234 db_printf("%s", kp->ktr_desc); 235#else 236 db_printf(kp->ktr_desc, kp->ktr_parm1, kp->ktr_parm2, 237 kp->ktr_parm3, kp->ktr_parm4, kp->ktr_parm5); 238#endif 239 db_printf("\n"); 240 } 241 242 if (tstate.first == -1) 243 tstate.first = tstate.cur; 244 245 if (--tstate.cur < 0) 246 tstate.cur = KTR_ENTRIES - 1; 247 248 return (1); 249} 250 251#endif /* DDB */ 252#endif /* KTR */ 253