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 * $FreeBSD$ 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/cons.h> 42 #include <sys/kernel.h> 43 #include <sys/ktr.h> 44 #include <sys/libkern.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 #include <sys/systm.h> 48 #include <sys/time.h> 49 50 #include <machine/cpu.h> 51 #ifdef __sparc64__ 52 #include <machine/ktr.h> 53 #endif 54 55 #include <ddb/ddb.h> 56 57 #ifndef KTR_ENTRIES 58 #define KTR_ENTRIES 1024 59 #endif 60 61 #ifndef KTR_MASK 62 #define KTR_MASK (KTR_GEN) 63 #endif 64 65 #ifndef KTR_CPUMASK 66 #define KTR_CPUMASK (~0) 67 #endif 68 69 #ifndef KTR_TIME 70 #define KTR_TIME get_cyclecount() 71 #endif 72 73 #ifndef KTR_CPU 74 #define KTR_CPU PCPU_GET(cpuid) 75 #endif 76 77 SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options"); 78 79 int ktr_cpumask = KTR_CPUMASK; 80 TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask); 81 SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, ""); 82 83 int ktr_mask = KTR_MASK; 84 TUNABLE_INT("debug.ktr.mask", &ktr_mask); 85 SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, ""); 86 87 int ktr_entries = KTR_ENTRIES; 88 SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, ""); 89 90 int ktr_version = KTR_VERSION; 91 SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, ""); 92 93 volatile int ktr_idx = 0; 94 struct ktr_entry ktr_buf[KTR_ENTRIES]; 95 96 #ifdef KTR_VERBOSE 97 int ktr_verbose = KTR_VERBOSE; 98 TUNABLE_INT("debug.ktr.verbose", &ktr_verbose); 99 SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); 100 #endif 101 102 void 103 ktr_tracepoint(u_int mask, const char *file, int line, const char *format, 104 u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5, 105 u_long arg6) 106 { 107 struct ktr_entry *entry; 108 int newindex, saveindex; 109 #ifdef KTR_VERBOSE 110 struct thread *td; 111 #endif 112 int cpu; 113 114 if (panicstr) 115 return; 116 if ((ktr_mask & mask) == 0) 117 return; 118 cpu = KTR_CPU; 119 if (((1 << cpu) & ktr_cpumask) == 0) 120 return; 121 #ifdef KTR_VERBOSE 122 td = curthread; 123 if (td->td_inktr) 124 return; 125 td->td_inktr++; 126 #endif 127 do { 128 saveindex = ktr_idx; 129 newindex = (saveindex + 1) & (KTR_ENTRIES - 1); 130 } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0); 131 entry = &ktr_buf[saveindex]; 132 entry->ktr_timestamp = KTR_TIME; 133 entry->ktr_cpu = cpu; 134 entry->ktr_file = file; 135 entry->ktr_line = line; 136 #ifdef KTR_VERBOSE 137 if (ktr_verbose) { 138 #ifdef SMP 139 printf("cpu%d ", cpu); 140 #endif 141 if (ktr_verbose > 1) { 142 printf("%s.%d\t", entry->ktr_file, 143 entry->ktr_line); 144 } 145 printf(format, arg1, arg2, arg3, arg4, arg5, arg6); 146 printf("\n"); 147 } 148 #endif 149 entry->ktr_desc = format; 150 entry->ktr_parms[0] = arg1; 151 entry->ktr_parms[1] = arg2; 152 entry->ktr_parms[2] = arg3; 153 entry->ktr_parms[3] = arg4; 154 entry->ktr_parms[4] = arg5; 155 entry->ktr_parms[5] = arg6; 156 #ifdef KTR_VERBOSE 157 td->td_inktr--; 158 #endif 159 } 160 161 #ifdef DDB 162 163 struct tstate { 164 int cur; 165 int first; 166 }; 167 static struct tstate tstate; 168 static int db_ktr_verbose; 169 static int db_mach_vtrace(void); 170 171 #define NUM_LINES_PER_PAGE 18 172 173 DB_SHOW_COMMAND(ktr, db_ktr_all) 174 { 175 int c, lines; 176 177 lines = NUM_LINES_PER_PAGE; 178 tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1); 179 tstate.first = -1; 180 if (strcmp(modif, "v") == 0) 181 db_ktr_verbose = 1; 182 else 183 db_ktr_verbose = 0; 184 while (db_mach_vtrace()) 185 if (--lines == 0) { 186 db_printf("--More--"); 187 c = cngetc(); 188 db_printf("\r"); 189 switch (c) { 190 case '\n': /* one more line */ 191 lines = 1; 192 break; 193 case ' ': /* one more page */ 194 lines = NUM_LINES_PER_PAGE; 195 break; 196 default: 197 db_printf("\n"); 198 return; 199 } 200 } 201 } 202 203 static int 204 db_mach_vtrace(void) 205 { 206 struct ktr_entry *kp; 207 208 if (tstate.cur == tstate.first) { 209 db_printf("--- End of trace buffer ---\n"); 210 return (0); 211 } 212 kp = &ktr_buf[tstate.cur]; 213 214 /* Skip over unused entries. */ 215 if (kp->ktr_desc == NULL) { 216 db_printf("--- End of trace buffer ---\n"); 217 return (0); 218 } 219 db_printf("%d: ", tstate.cur); 220 #ifdef SMP 221 db_printf("cpu%d ", kp->ktr_cpu); 222 #endif 223 if (db_ktr_verbose) { 224 db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp, 225 kp->ktr_file, kp->ktr_line); 226 } 227 db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1], 228 kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4], 229 kp->ktr_parms[5]); 230 db_printf("\n"); 231 232 if (tstate.first == -1) 233 tstate.first = tstate.cur; 234 235 if (--tstate.cur < 0) 236 tstate.cur = KTR_ENTRIES - 1; 237 238 return (1); 239 } 240 241 #endif /* DDB */ 242