/* * Copyright (c) 2000 * John Baldwin . All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY JOHN BALDWIN AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL JOHN BALDWIN OR THE VOICES IN HIS HEAD * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ /* * This module holds the global variables used by KTR and the ktr_tracepoint() * function that does the actual tracing. */ #include "opt_ddb.h" #include "opt_ktr.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef KTR_MASK #define KTR_MASK (KTR_GEN) #endif #ifndef KTR_CPUMASK #define KTR_CPUMASK (~0) #endif #ifdef SMP #define KTR_CPU PCPU_GET(cpuid) #else #define KTR_CPU 0 #endif #ifdef KTR_EXTEND #define KTR_EXTEND_DEFAULT 1 #else #define KTR_EXTEND_DEFAULT 0 #endif #ifdef KTR_VERBOSE #define KTR_VERBOSE_DEFAULT 1 #else #define KTR_VERBOSE_DEFAULT 0 #endif SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options"); /* * This variable is used only by gdb to work out what fields are in * ktr_entry. */ int ktr_extend = KTR_EXTEND_DEFAULT; SYSCTL_INT(_debug_ktr, OID_AUTO, extend, CTLFLAG_RD, &ktr_extend, 0, ""); int ktr_cpumask = KTR_CPUMASK; TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask); SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, ""); int ktr_mask = KTR_MASK; TUNABLE_INT("debug.ktr.mask", &ktr_mask); SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, ""); int ktr_entries = KTR_ENTRIES; SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, ""); volatile int ktr_idx = 0; struct ktr_entry ktr_buf[KTR_ENTRIES]; int ktr_verbose = KTR_VERBOSE_DEFAULT; TUNABLE_INT("debug.ktr.verbose", &ktr_verbose); SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); #ifdef KTR #ifdef KTR_EXTEND void ktr_tracepoint(u_int mask, const char *filename, u_int line, const char *format, ...) #else void ktr_tracepoint(u_int mask, const char *format, u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5) #endif { struct ktr_entry *entry; int newindex, saveindex; critical_t savecrit; #ifdef KTR_EXTEND va_list ap; #endif if (panicstr) return; if ((ktr_mask & mask) == 0) return; #ifdef KTR_EXTEND if (((1 << KTR_CPU) & ktr_cpumask) == 0) return; #endif savecrit = critical_enter(); do { saveindex = ktr_idx; newindex = (saveindex + 1) & (KTR_ENTRIES - 1); } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0); entry = &ktr_buf[saveindex]; critical_exit(savecrit); if (ktr_mask & KTR_LOCK) /* * We can't use nanotime with KTR_LOCK, it would cause * endless recursion, at least under the Intel * architecture. */ getnanotime(&entry->ktr_tv); else nanotime(&entry->ktr_tv); #ifdef KTR_EXTEND entry->ktr_filename = filename; entry->ktr_line = line; entry->ktr_cpu = KTR_CPU; va_start(ap, format); vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap); va_end(ap); if (ktr_verbose) { #ifdef SMP printf("cpu%d ", entry->ktr_cpu); #endif if (ktr_verbose > 1) printf("%s.%d\t", entry->ktr_filename, entry->ktr_line); va_start(ap, format); vprintf(format, ap); printf("\n"); va_end(ap); } #else entry->ktr_desc = format; entry->ktr_parm1 = arg1; entry->ktr_parm2 = arg2; entry->ktr_parm3 = arg3; entry->ktr_parm4 = arg4; entry->ktr_parm5 = arg5; #endif } #ifdef DDB struct tstate { int cur; int first; }; static struct tstate tstate; static int db_ktr_verbose; static int db_mach_vtrace(void); #define NUM_LINES_PER_PAGE 18 DB_SHOW_COMMAND(ktr, db_ktr_all) { int c, lines; lines = NUM_LINES_PER_PAGE; tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1); tstate.first = -1; if (strcmp(modif, "v") == 0) db_ktr_verbose = 1; else db_ktr_verbose = 0; while (db_mach_vtrace()) if (--lines == 0) { db_printf("--More--"); c = cngetc(); db_printf("\r"); switch (c) { case '\n': /* one more line */ lines = 1; break; case ' ': /* one more page */ lines = NUM_LINES_PER_PAGE; break; default: db_printf("\n"); return; } } } static int db_mach_vtrace(void) { struct ktr_entry *kp; if (tstate.cur == tstate.first) { db_printf("--- End of trace buffer ---\n"); return (0); } kp = &ktr_buf[tstate.cur]; /* Skip over unused entries. */ #ifdef KTR_EXTEND if (kp->ktr_desc[0] == '\0') { #else if (kp->ktr_desc == NULL) { #endif db_printf("--- End of trace buffer ---\n"); return (0); } db_printf("%d: ", tstate.cur); if (db_ktr_verbose) db_printf("%4ld.%06ld ", (long)kp->ktr_tv.tv_sec, kp->ktr_tv.tv_nsec / 1000); #ifdef KTR_EXTEND #ifdef SMP db_printf("cpu%d ", kp->ktr_cpu); #endif if (db_ktr_verbose) db_printf("%s.%d\t", kp->ktr_filename, kp->ktr_line); db_printf("%s", kp->ktr_desc); #else db_printf(kp->ktr_desc, kp->ktr_parm1, kp->ktr_parm2, kp->ktr_parm3, kp->ktr_parm4, kp->ktr_parm5); #endif db_printf("\n"); if (tstate.first == -1) tstate.first = tstate.cur; if (--tstate.cur < 0) tstate.cur = KTR_ENTRIES - 1; return (1); } #endif /* DDB */ #endif /* KTR */