linux-kernel - [PATCH 18/27] perf intel-pt: Add a helper function for processing AUXTRACE

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Date:   Thu, 29 Sep 2016 11:35:47 -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 18/27] perf intel-pt: Add a helper function for processing AUXTRACE_INFO

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

Add a helper function 'intel_pt_has()' to make it easier to determine
which members the AUXTRACE_INFO event contains.

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/1474641528-18776-13-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 96519e801e53..f16b00f55a19 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -2037,6 +2037,12 @@ static void intel_pt_print_info(u64 *arr, int start, int finish)
 		fprintf(stdout, intel_pt_info_fmts[i], arr[i]);
 }
 
+static bool intel_pt_has(struct auxtrace_info_event *auxtrace_info, int pos)
+{
+	return auxtrace_info->header.size >=
+		sizeof(struct auxtrace_info_event) + (sizeof(u64) * (pos + 1));
+}
+
 int intel_pt_process_auxtrace_info(union perf_event *event,
 				   struct perf_session *session)
 {
@@ -2077,8 +2083,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
 	intel_pt_print_info(&auxtrace_info->priv[0], INTEL_PT_PMU_TYPE,
 			    INTEL_PT_PER_CPU_MMAPS);
 
-	if (auxtrace_info->header.size >= sizeof(struct auxtrace_info_event) +
-					(sizeof(u64) * INTEL_PT_CYC_BIT)) {
+	if (intel_pt_has(auxtrace_info, INTEL_PT_CYC_BIT)) {
 		pt->mtc_bit = auxtrace_info->priv[INTEL_PT_MTC_BIT];
 		pt->mtc_freq_bits = auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS];
 		pt->tsc_ctc_ratio_n = auxtrace_info->priv[INTEL_PT_TSC_CTC_N];
@@ -2088,8 +2093,7 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
 				    INTEL_PT_CYC_BIT);
 	}
 
-	if (auxtrace_info->header.size >= sizeof(struct auxtrace_info_event) +
-				(sizeof(u64) * INTEL_PT_MAX_NONTURBO_RATIO)) {
+	if (intel_pt_has(auxtrace_info, INTEL_PT_MAX_NONTURBO_RATIO)) {
 		pt->max_non_turbo_ratio =
 			auxtrace_info->priv[INTEL_PT_MAX_NONTURBO_RATIO];
 		intel_pt_print_info(&auxtrace_info->priv[0],
-- 
2.7.4