linux-kernel - [PATCH 19/27] perf intel-pt: Record address filter in AUXTRACE

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Date:   Thu, 29 Sep 2016 11:35:48 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Linux Weekly News <lwn@....net>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 19/27] perf intel-pt: Record address filter in AUXTRACE_INFO event

From: Adrian Hunter <adrian.hunter@...el.com>

The address filter is needed to help decode the trace, so store it in
the AUXTRACE_INFO event.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Link: http://lkml.kernel.org/r/1474641528-18776-14-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/arch/x86/util/intel-pt.c | 51 ++++++++++++++++++++++++++++++++++---
 tools/perf/util/intel-pt.h          |  3 +--
 2 files changed, 48 insertions(+), 6 deletions(-)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 18b21514c153..90fa2286edcf 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -62,6 +62,7 @@ struct intel_pt_recording {
 	size_t				snapshot_ref_buf_size;
 	int				snapshot_ref_cnt;
 	struct intel_pt_snapshot_ref	*snapshot_refs;
+	size_t				priv_size;
 };
 
 static int intel_pt_parse_terms_with_default(struct list_head *formats,
@@ -273,11 +274,37 @@ intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
 	return attr;
 }
 
+static const char *intel_pt_find_filter(struct perf_evlist *evlist,
+					struct perf_pmu *intel_pt_pmu)
+{
+	struct perf_evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel->attr.type == intel_pt_pmu->type)
+			return evsel->filter;
+	}
+
+	return NULL;
+}
+
+static size_t intel_pt_filter_bytes(const char *filter)
+{
+	size_t len = filter ? strlen(filter) : 0;
+
+	return len ? roundup(len + 1, 8) : 0;
+}
+
 static size_t
-intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused,
-			struct perf_evlist *evlist __maybe_unused)
+intel_pt_info_priv_size(struct auxtrace_record *itr, struct perf_evlist *evlist)
 {
-	return INTEL_PT_AUXTRACE_PRIV_SIZE;
+	struct intel_pt_recording *ptr =
+			container_of(itr, struct intel_pt_recording, itr);
+	const char *filter = intel_pt_find_filter(evlist, ptr->intel_pt_pmu);
+
+	ptr->priv_size = (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64)) +
+			 intel_pt_filter_bytes(filter);
+
+	return ptr->priv_size;
 }
 
 static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d)
@@ -303,9 +330,12 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit;
 	u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d;
 	unsigned long max_non_turbo_ratio;
+	size_t filter_str_len;
+	const char *filter;
+	u64 *info;
 	int err;
 
-	if (priv_size != INTEL_PT_AUXTRACE_PRIV_SIZE)
+	if (priv_size != ptr->priv_size)
 		return -EINVAL;
 
 	intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
@@ -322,6 +352,9 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 				"%lu", &max_non_turbo_ratio) != 1)
 		max_non_turbo_ratio = 0;
 
+	filter = intel_pt_find_filter(session->evlist, ptr->intel_pt_pmu);
+	filter_str_len = filter ? strlen(filter) : 0;
+
 	if (!session->evlist->nr_mmaps)
 		return -EINVAL;
 
@@ -357,6 +390,16 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d;
 	auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit;
 	auxtrace_info->priv[INTEL_PT_MAX_NONTURBO_RATIO] = max_non_turbo_ratio;
+	auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] = filter_str_len;
+
+	info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1;
+
+	if (filter_str_len) {
+		size_t len = intel_pt_filter_bytes(filter);
+
+		strncpy((char *)info, filter, len);
+		info += len >> 3;
+	}
 
 	return 0;
 }
diff --git a/tools/perf/util/intel-pt.h b/tools/perf/util/intel-pt.h
index 8b8356233e6a..e13b14e5a37b 100644
--- a/tools/perf/util/intel-pt.h
+++ b/tools/perf/util/intel-pt.h
@@ -35,11 +35,10 @@ enum {
 	INTEL_PT_TSC_CTC_D,
 	INTEL_PT_CYC_BIT,
 	INTEL_PT_MAX_NONTURBO_RATIO,
+	INTEL_PT_FILTER_STR_LEN,
 	INTEL_PT_AUXTRACE_PRIV_MAX,
 };
 
-#define INTEL_PT_AUXTRACE_PRIV_SIZE (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64))
-
 struct auxtrace_record;
 struct perf_tool;
 union perf_event;
-- 
2.7.4