diff options
Diffstat (limited to 'sys/kern/kern_ktr.c')
| -rw-r--r-- | sys/kern/kern_ktr.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/sys/kern/kern_ktr.c b/sys/kern/kern_ktr.c new file mode 100644 index 0000000..719d5e4 --- /dev/null +++ b/sys/kern/kern_ktr.c @@ -0,0 +1,241 @@ +/* + * Copyright (c) 2000 + * John Baldwin <jhb@FreeBSD.org>. 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 <sys/param.h> +#include <sys/cons.h> +#include <sys/kernel.h> +#include <sys/ktr.h> +#include <sys/libkern.h> +#include <sys/proc.h> +#include <sys/sysctl.h> +#include <sys/systm.h> +#include <sys/time.h> + +#include <machine/cpu.h> +#ifdef __sparc64__ +#include <machine/ktr.h> +#endif + +#include <ddb/ddb.h> + +#ifndef KTR_ENTRIES +#define KTR_ENTRIES 1024 +#endif + +#ifndef KTR_MASK +#define KTR_MASK (KTR_GEN) +#endif + +#ifndef KTR_CPUMASK +#define KTR_CPUMASK (~0) +#endif + +#ifndef KTR_TIME +#define KTR_TIME get_cyclecount() +#endif + +#ifndef KTR_CPU +#define KTR_CPU PCPU_GET(cpuid) +#endif + +SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options"); + +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, ""); + +int ktr_version = KTR_VERSION; +SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD, &ktr_version, 0, ""); + +volatile int ktr_idx = 0; +struct ktr_entry ktr_buf[KTR_ENTRIES]; + +#ifdef KTR_VERBOSE +int ktr_verbose = KTR_VERBOSE; +TUNABLE_INT("debug.ktr.verbose", &ktr_verbose); +SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, ""); +#endif + +void +ktr_tracepoint(u_int mask, const char *file, int line, const char *format, + u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5, + u_long arg6) +{ + struct ktr_entry *entry; + int newindex, saveindex; +#ifdef KTR_VERBOSE + struct thread *td; +#endif + int cpu; + + if (panicstr) + return; + if ((ktr_mask & mask) == 0) + return; + cpu = KTR_CPU; + if (((1 << cpu) & ktr_cpumask) == 0) + return; +#ifdef KTR_VERBOSE + td = curthread; + if (td->td_inktr) + return; + td->td_inktr++; +#endif + do { + saveindex = ktr_idx; + newindex = (saveindex + 1) & (KTR_ENTRIES - 1); + } while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0); + entry = &ktr_buf[saveindex]; + entry->ktr_timestamp = KTR_TIME; + entry->ktr_cpu = cpu; + entry->ktr_file = file; + entry->ktr_line = line; +#ifdef KTR_VERBOSE + if (ktr_verbose) { +#ifdef SMP + printf("cpu%d ", cpu); +#endif + if (ktr_verbose > 1) { + printf("%s.%d\t", entry->ktr_file, + entry->ktr_line); + } + printf(format, arg1, arg2, arg3, arg4, arg5, arg6); + printf("\n"); + } +#endif + entry->ktr_desc = format; + entry->ktr_parms[0] = arg1; + entry->ktr_parms[1] = arg2; + entry->ktr_parms[2] = arg3; + entry->ktr_parms[3] = arg4; + entry->ktr_parms[4] = arg5; + entry->ktr_parms[5] = arg6; +#ifdef KTR_VERBOSE + td->td_inktr--; +#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. */ + if (kp->ktr_desc == NULL) { + db_printf("--- End of trace buffer ---\n"); + return (0); + } + db_printf("%d: ", tstate.cur); +#ifdef SMP + db_printf("cpu%d ", kp->ktr_cpu); +#endif + if (db_ktr_verbose) { + db_printf("%10.10lld %s.%d\t", (long long)kp->ktr_timestamp, + kp->ktr_file, kp->ktr_line); + } + db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1], + kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4], + kp->ktr_parms[5]); + db_printf("\n"); + + if (tstate.first == -1) + tstate.first = tstate.cur; + + if (--tstate.cur < 0) + tstate.cur = KTR_ENTRIES - 1; + + return (1); +} + +#endif /* DDB */ |
