linux-kernel - [PATCH 13/25] perf intel-pt: Record Event Trace capability flag

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Date:   Mon, 24 Jan 2022 10:41:49 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 13/25] perf intel-pt: Record Event Trace capability flag

The change to the MODE.Exec packet means processing must distinguish
between the old and new cases. Record the Event Trace capability flag to
make that possible.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/arch/x86/util/intel-pt.c |  7 +++++++
 tools/perf/util/intel-pt.c          | 10 +++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 6df0dc00d73a..8c31578d6f4a 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -306,6 +306,7 @@ intel_pt_info_priv_size(struct auxtrace_record *itr, struct evlist *evlist)
 
 	ptr->priv_size = (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64)) +
 			 intel_pt_filter_bytes(filter);
+	ptr->priv_size += sizeof(u64); /* Cap Event Trace */
 
 	return ptr->priv_size;
 }
@@ -335,6 +336,7 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	unsigned long max_non_turbo_ratio;
 	size_t filter_str_len;
 	const char *filter;
+	int event_trace;
 	__u64 *info;
 	int err;
 
@@ -357,6 +359,9 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 	if (perf_pmu__scan_file(intel_pt_pmu, "max_nonturbo_ratio",
 				"%lu", &max_non_turbo_ratio) != 1)
 		max_non_turbo_ratio = 0;
+	if (perf_pmu__scan_file(intel_pt_pmu, "caps/event_trace",
+				"%d", &event_trace) != 1)
+		event_trace = 0;
 
 	filter = intel_pt_find_filter(session->evlist, ptr->intel_pt_pmu);
 	filter_str_len = filter ? strlen(filter) : 0;
@@ -407,6 +412,8 @@ static int intel_pt_info_fill(struct auxtrace_record *itr,
 		info += len >> 3;
 	}
 
+	*info++ = event_trace;
+
 	return 0;
 }
 
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index f3e5c2dfee25..23cb272e3d03 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -75,6 +75,7 @@ struct intel_pt {
 	bool mispred_all;
 	bool use_thread_stack;
 	bool callstack;
+	bool cap_event_trace;
 	unsigned int br_stack_sz;
 	unsigned int br_stack_sz_plus;
 	int have_sched_switch;
@@ -3795,7 +3796,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
 	}
 
 	info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1;
-	info_end = (void *)info + auxtrace_info->header.size;
+	info_end = (void *)auxtrace_info + auxtrace_info->header.size;
 
 	if (intel_pt_has(auxtrace_info, INTEL_PT_FILTER_STR_LEN)) {
 		size_t len;
@@ -3834,6 +3835,13 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
 		intel_pt_print_info_str("Filter string", pt->filter);
 	}
 
+	if ((void *)info < info_end) {
+		pt->cap_event_trace = *info++;
+		if (dump_trace)
+			fprintf(stdout, "  Cap Event Trace     %d\n",
+				pt->cap_event_trace);
+	}
+
 	pt->timeless_decoding = intel_pt_timeless_decoding(pt);
 	if (pt->timeless_decoding && !pt->tc.time_mult)
 		pt->tc.time_mult = 1;
-- 
2.25.1