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_ktr.h" 38 39 #include <sys/types.h> 40 #include <sys/time.h> 41 #include <sys/ktr.h> 42 #include <sys/libkern.h> 43 #include <sys/linker_set.h> 44 #include <sys/sysctl.h> 45 #include <sys/systm.h> 46 #include <machine/globals.h> 47 #include <machine/stdarg.h> 48 49 #ifndef KTR_MASK 50 #define KTR_MASK (KTR_GEN) 51 #endif 52 53 #ifndef KTR_CPUMASK 54 #define KTR_CPUMASK (~0) 55 #endif 56 57 #ifdef SMP 58 #define KTR_CPU cpuid 59 #else 60 #define KTR_CPU 0 61 #endif 62 63 #ifdef KTR_EXTEND 64 /* 65 * This variable is used only by gdb to work out what fields are in 66 * ktr_entry. 67 */ 68 int ktr_extend = 1; 69 SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, ""); 70 #else 71 int ktr_extend = 0; 72 SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, ""); 73 #endif /* KTR_EXTEND */ 74 75 int ktr_cpumask = KTR_CPUMASK; 76 SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, ""); 77 78 int ktr_mask = KTR_MASK; 79 SYSCTL_INT(_debug, OID_AUTO, ktr_mask, CTLFLAG_RW, &ktr_mask, KTR_MASK, ""); 80 81 int ktr_entries = KTR_ENTRIES; 82 SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES, ""); 83 84 volatile int ktr_idx = 0; 85 struct ktr_entry ktr_buf[KTR_ENTRIES]; 86 87 #ifdef KTR_VERBOSE 88 int ktr_verbose = 1; 89 #else 90 int ktr_verbose = 0; 91 #endif 92 SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); 93 94 #ifdef KTR 95 #ifdef KTR_EXTEND 96 void 97 ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...) 98 #else 99 void 100 ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3, 101 u_long arg4, u_long arg5) 102 #endif 103 { 104 struct ktr_entry *entry; 105 int newindex, saveindex, saveintr; 106 #ifdef KTR_EXTEND 107 va_list ap; 108 #endif 109 110 if ((ktr_mask & mask) == 0) 111 return; 112 #ifdef KTR_EXTEND 113 if (((1 << KTR_CPU) & ktr_cpumask) == 0) 114 return; 115 #endif 116 saveintr = save_intr(); 117 disable_intr(); 118 do { 119 saveindex = ktr_idx; 120 newindex = (saveindex + 1) & (KTR_ENTRIES - 1); 121 } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0); 122 entry = &ktr_buf[saveindex]; 123 restore_intr(saveintr); 124 nanotime(&entry->ktr_tv); 125 #ifdef KTR_EXTEND 126 strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1); 127 entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0'; 128 entry->ktr_line = line; 129 entry->ktr_cpu = KTR_CPU; 130 va_start(ap, format); 131 vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap); 132 va_end(ap); 133 if (ktr_verbose) { 134 #ifdef SMP 135 printf("cpu%d ", entry->ktr_cpu); 136 #endif 137 if (ktr_verbose > 1) 138 printf("%s.%d\t", entry->ktr_filename, entry->ktr_line); 139 va_start(ap, format); 140 vprintf(format, ap); 141 printf("\n"); 142 va_end(ap); 143 } 144 #else 145 entry->ktr_desc = format; 146 entry->ktr_parm1 = arg1; 147 entry->ktr_parm2 = arg2; 148 entry->ktr_parm3 = arg3; 149 entry->ktr_parm4 = arg4; 150 entry->ktr_parm5 = arg5; 151 #endif 152 } 153 #endif /* KTR */ 154