perf tools: Add Intel PT log

Add a facility to log Intel Processor Trace decoding.  The log is
intended for debugging purposes only.

The log file name is "intel_pt.log" and is opened in the current
directory.  The log contains a record of all packets and instructions
decoded and can get very large (10 MB would be a small one).

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1437150840-31811-5-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2015-07-17 19:33:39 +03:00 committed by Arnaldo Carvalho de Melo
parent 237fae79f5
commit 53af92849d
3 changed files with 208 additions and 1 deletions

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@ -1,4 +1,4 @@
libperf-$(CONFIG_AUXTRACE) += intel-pt-pkt-decoder.o intel-pt-insn-decoder.o
libperf-$(CONFIG_AUXTRACE) += intel-pt-pkt-decoder.o intel-pt-insn-decoder.o intel-pt-log.o
inat_tables_script = util/intel-pt-decoder/gen-insn-attr-x86.awk
inat_tables_maps = util/intel-pt-decoder/x86-opcode-map.txt

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/*
* intel_pt_log.c: Intel Processor Trace support
* Copyright (c) 2013-2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include "intel-pt-log.h"
#include "intel-pt-insn-decoder.h"
#include "intel-pt-pkt-decoder.h"
#define MAX_LOG_NAME 256
static FILE *f;
static char log_name[MAX_LOG_NAME];
static bool enable_logging;
void intel_pt_log_enable(void)
{
enable_logging = true;
}
void intel_pt_log_disable(void)
{
if (f)
fflush(f);
enable_logging = false;
}
void intel_pt_log_set_name(const char *name)
{
strncpy(log_name, name, MAX_LOG_NAME - 5);
strcat(log_name, ".log");
}
static void intel_pt_print_data(const unsigned char *buf, int len, uint64_t pos,
int indent)
{
int i;
for (i = 0; i < indent; i++)
fprintf(f, " ");
fprintf(f, " %08" PRIx64 ": ", pos);
for (i = 0; i < len; i++)
fprintf(f, " %02x", buf[i]);
for (; i < 16; i++)
fprintf(f, " ");
fprintf(f, " ");
}
static void intel_pt_print_no_data(uint64_t pos, int indent)
{
int i;
for (i = 0; i < indent; i++)
fprintf(f, " ");
fprintf(f, " %08" PRIx64 ": ", pos);
for (i = 0; i < 16; i++)
fprintf(f, " ");
fprintf(f, " ");
}
static int intel_pt_log_open(void)
{
if (!enable_logging)
return -1;
if (f)
return 0;
if (!log_name[0])
return -1;
f = fopen(log_name, "w+");
if (!f) {
enable_logging = false;
return -1;
}
return 0;
}
void intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
uint64_t pos, const unsigned char *buf)
{
char desc[INTEL_PT_PKT_DESC_MAX];
if (intel_pt_log_open())
return;
intel_pt_print_data(buf, pkt_len, pos, 0);
intel_pt_pkt_desc(packet, desc, INTEL_PT_PKT_DESC_MAX);
fprintf(f, "%s\n", desc);
}
void intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
{
char desc[INTEL_PT_INSN_DESC_MAX];
size_t len = intel_pt_insn->length;
if (intel_pt_log_open())
return;
if (len > INTEL_PT_INSN_DBG_BUF_SZ)
len = INTEL_PT_INSN_DBG_BUF_SZ;
intel_pt_print_data(intel_pt_insn->buf, len, ip, 8);
if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
fprintf(f, "%s\n", desc);
else
fprintf(f, "Bad instruction!\n");
}
void intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn, uint64_t ip)
{
char desc[INTEL_PT_INSN_DESC_MAX];
if (intel_pt_log_open())
return;
intel_pt_print_no_data(ip, 8);
if (intel_pt_insn_desc(intel_pt_insn, desc, INTEL_PT_INSN_DESC_MAX) > 0)
fprintf(f, "%s\n", desc);
else
fprintf(f, "Bad instruction!\n");
}
void intel_pt_log(const char *fmt, ...)
{
va_list args;
if (intel_pt_log_open())
return;
va_start(args, fmt);
vfprintf(f, fmt, args);
va_end(args);
}

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/*
* intel_pt_log.h: Intel Processor Trace support
* Copyright (c) 2013-2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#ifndef INCLUDE__INTEL_PT_LOG_H__
#define INCLUDE__INTEL_PT_LOG_H__
#include <stdint.h>
#include <inttypes.h>
struct intel_pt_pkt;
void intel_pt_log_enable(void);
void intel_pt_log_disable(void);
void intel_pt_log_set_name(const char *name);
void intel_pt_log_packet(const struct intel_pt_pkt *packet, int pkt_len,
uint64_t pos, const unsigned char *buf);
struct intel_pt_insn;
void intel_pt_log_insn(struct intel_pt_insn *intel_pt_insn, uint64_t ip);
void intel_pt_log_insn_no_data(struct intel_pt_insn *intel_pt_insn,
uint64_t ip);
__attribute__((format(printf, 1, 2)))
void intel_pt_log(const char *fmt, ...);
#define x64_fmt "0x%" PRIx64
static inline void intel_pt_log_at(const char *msg, uint64_t u)
{
intel_pt_log("%s at " x64_fmt "\n", msg, u);
}
static inline void intel_pt_log_to(const char *msg, uint64_t u)
{
intel_pt_log("%s to " x64_fmt "\n", msg, u);
}
#endif