linux-kernel - [PATCH V5 10/25] perf itrace: Add helpers for Instruction Tracing errors

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Date:	Sat,  7 Mar 2015 23:06:19 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH V5 10/25] perf itrace: Add helpers for Instruction Tracing errors

Add functions to synthesize, count and print
Instruction Tracing error events.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/itrace.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/itrace.h | 13 +++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/tools/perf/util/itrace.c b/tools/perf/util/itrace.c
index 817b7b7..cf5a476 100644
--- a/tools/perf/util/itrace.c
+++ b/tools/perf/util/itrace.c
@@ -24,6 +24,7 @@
 #include <linux/log2.h>
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <errno.h>
 
@@ -35,6 +36,7 @@
 #include "itrace.h"
 
 #include "event.h"
+#include "session.h"
 #include "debug.h"
 #include "parse-options.h"
 
@@ -160,6 +162,28 @@ itrace_record__init(struct perf_evlist *evlist __maybe_unused, int *err)
 	return NULL;
 }
 
+void itrace_synth_error(struct itrace_error_event *itrace_error, int type,
+			int code, int cpu, pid_t pid, pid_t tid, u64 ip,
+			const char *msg)
+{
+	size_t size;
+
+	memset(itrace_error, 0, sizeof(struct itrace_error_event));
+
+	itrace_error->header.type = PERF_RECORD_ITRACE_ERROR;
+	itrace_error->type = type;
+	itrace_error->code = code;
+	itrace_error->cpu = cpu;
+	itrace_error->pid = pid;
+	itrace_error->tid = tid;
+	itrace_error->ip = ip;
+	strlcpy(itrace_error->msg, msg, MAX_ITRACE_ERROR_MSG);
+
+	size = (void *)itrace_error->msg - (void *)itrace_error +
+	       strlen(itrace_error->msg) + 1;
+	itrace_error->header.size = PERF_ALIGN(size, sizeof(u64));
+}
+
 int perf_event__synthesize_itrace_info(struct itrace_record *itr,
 				       struct perf_tool *tool,
 				       struct perf_session *session,
@@ -339,6 +363,25 @@ out_err:
 	return -EINVAL;
 }
 
+size_t perf_event__fprintf_itrace_error(union perf_event *event, FILE *fp)
+{
+	struct itrace_error_event *e = &event->itrace_error;
+	int ret;
+
+	ret = fprintf(fp, " Instruction trace error type %u", e->type);
+	ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRIx64" code %u: %s\n",
+		       e->cpu, e->pid, e->tid, e->ip, e->code, e->msg);
+	return ret;
+}
+
+int perf_event__process_itrace_error(struct perf_tool *tool __maybe_unused,
+				     union perf_event *event,
+				     struct perf_session *session __maybe_unused)
+{
+	perf_event__fprintf_itrace_error(event, stdout);
+	return 0;
+}
+
 int itrace_mmap__read(struct itrace_mmap *mm, struct itrace_record *itr,
 		      struct perf_tool *tool, process_itrace_t fn)
 {
diff --git a/tools/perf/util/itrace.h b/tools/perf/util/itrace.h
index 5a82326..743fe96 100644
--- a/tools/perf/util/itrace.h
+++ b/tools/perf/util/itrace.h
@@ -33,6 +33,10 @@ struct option;
 struct record_opts;
 struct itrace_info_event;
 
+enum itrace_error_type {
+	PERF_ITRACE_DECODER_ERROR = 1,
+};
+
 enum itrace_period_type {
 	PERF_ITRACE_PERIOD_INSTRUCTIONS,
 	PERF_ITRACE_PERIOD_TICKS,
@@ -200,6 +204,10 @@ int itrace_record__info_fill(struct itrace_record *itr,
 void itrace_record__free(struct itrace_record *itr);
 u64 itrace_record__reference(struct itrace_record *itr);
 
+void itrace_synth_error(struct itrace_error_event *itrace_error, int type,
+			int code, int cpu, pid_t pid, pid_t tid, u64 ip,
+			const char *msg);
+
 int perf_event__synthesize_itrace_info(struct itrace_record *itr,
 				       struct perf_tool *tool,
 				       struct perf_session *session,
@@ -208,10 +216,15 @@ int perf_event__synthesize_itrace(struct perf_tool *tool,
 				  perf_event__handler_t process,
 				  size_t size, u64 offset, u64 ref, int idx,
 				  u32 tid, u32 cpu);
+int perf_event__process_itrace_error(struct perf_tool *tool,
+				     union perf_event *event,
+				     struct perf_session *session);
 int itrace_parse_synth_opts(const struct option *opt, const char *str,
 			    int unset);
 void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts);
 
+size_t perf_event__fprintf_itrace_error(union perf_event *event, FILE *fp);
+
 static inline int itrace__process_event(struct perf_session *session,
 					union perf_event *event,
 					struct perf_sample *sample,
-- 
1.9.1

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