[PATCH 12/16] perf intel-pt: Add a helper function for processing AUXTRACE_INFO

From: Adrian Hunter
Date: Fri Sep 23 2016 - 10:44:02 EST


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@xxxxxxxxx>
---
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],
--
1.9.1