[tip:perf/core] perf intel-pt: Record address filter in AUXTRACE_INFO event

From: tip-bot for Adrian Hunter
Date: Thu Sep 29 2016 - 14:18:13 EST


Commit-ID: c093f308cea3eb4be3ed6e7e9ad54bf67a26abe4
Gitweb: http://git.kernel.org/tip/c093f308cea3eb4be3ed6e7e9ad54bf67a26abe4
Author: Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Fri, 23 Sep 2016 17:38:45 +0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 29 Sep 2016 11:17:05 -0300

perf intel-pt: Record address filter in AUXTRACE_INFO event

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@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1474641528-18776-14-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
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 18b2151..90fa228 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 8b83562..e13b14e 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;