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>

diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
index 5a46ce13c1f846490d56d097a044c242845b7c7c..3c717b420c899d88e09de7afd9fb04323ced72b4 100644 (file)
--- a/tools/perf/util/intel-pt-decoder/Build
+++ b/tools/perf/util/intel-pt-decoder/Build
@@ -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

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-log.c b/tools/perf/util/intel-pt-decoder/intel-pt-log.c
new file mode 100644 (file)
index 0000000..d09c7d9
--- /dev/null
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-log.c
@@ -0,0 +1,155 @@
+/*
+ * 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);
+}

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-log.h b/tools/perf/util/intel-pt-decoder/intel-pt-log.h
new file mode 100644 (file)
index 0000000..db3942f
--- /dev/null
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-log.h
@@ -0,0 +1,52 @@
+/*
+ * 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