perf tools: Support arch specific PERF_SAMPLE_WEIGHT_STRUCT processing

For X86, the var2_w field of PERF_SAMPLE_WEIGHT_STRUCT stands for the
instruction latency. Current perf forces the var2_w to the data->ins_lat
in the generic code. It works well for now because X86 is the only
architecture that supports the PERF_SAMPLE_WEIGHT_STRUCT, but it may
bring problems once other architectures support the sample type.  For
example, the var2_w may be used to capture something else on PowerPC.

Create two architecture specific functions to parse and synthesize the
weight related samples. Move the X86 specific codes to the X86 version
functions. Other architectures can implement their own functions later
separately.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/1612540912-6562-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 844aebd9c306..1bf76864c4f2 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2105,6 +2105,13 @@ perf_event__check_size(union perf_event *event, unsigned int sample_size)
 	return 0;
 }
 
+void __weak arch_perf_parse_sample_weight(struct perf_sample *data,
+					  const __u64 *array,
+					  u64 type __maybe_unused)
+{
+	data->weight = *array;
+}
+
 int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 			struct perf_sample *data)
 {
@@ -2346,16 +2353,8 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 	}
 
 	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
-		union perf_sample_weight weight;
-
 		OVERFLOW_CHECK_u64(array);
-		weight.full = *array;
-		if (type & PERF_SAMPLE_WEIGHT)
-			data->weight = weight.full;
-		else {
-			data->weight = weight.var1_dw;
-			data->ins_lat = weight.var2_w;
-		}
+		arch_perf_parse_sample_weight(data, array, type);
 		array++;
 	}