[PATCH 5/8] perf bpf filter: Add 'pid' sample data support

[Namhyung Kim]

The pid is special because it's saved in the PERF_SAMPLE_TID together.
So it needs to differenciate tid and pid using the 'part' field in the
perf bpf filter entry struct.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/bpf-filter.c                 |  4 +++-
 tools/perf/util/bpf-filter.h                 |  3 ++-
 tools/perf/util/bpf-filter.l                 | 11 ++++++++++-
 tools/perf/util/bpf-filter.y                 |  7 +++++--
 tools/perf/util/bpf_skel/sample-filter.h     |  3 ++-
 tools/perf/util/bpf_skel/sample_filter.bpf.c |  5 ++++-
 6 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/bpf-filter.c b/tools/perf/util/bpf-filter.c
index 11fb391c92e9..2e02dc965dd9 100644
--- a/tools/perf/util/bpf-filter.c
+++ b/tools/perf/util/bpf-filter.c
@@ -43,6 +43,7 @@ int perf_bpf_filter__prepare(struct evsel *evsel)
 	list_for_each_entry(expr, &evsel->bpf_filters, list) {
 		struct perf_bpf_filter_entry entry = {
 			.op = expr->op,
+			.part = expr->part,
 			.flags = expr->sample_flags,
 			.value = expr->val,
 		};
@@ -83,7 +84,7 @@ u64 perf_bpf_filter__lost_count(struct evsel *evsel)
 	return skel ? skel->bss->dropped : 0;
 }
 
-struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags,
+struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags, int part,
 						       enum perf_bpf_filter_op op,
 						       unsigned long val)
 {
@@ -92,6 +93,7 @@ struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flag
 	expr = malloc(sizeof(*expr));
 	if (expr != NULL) {
 		expr->sample_flags = sample_flags;
+		expr->part = part;
 		expr->op = op;
 		expr->val = val;
 	}
diff --git a/tools/perf/util/bpf-filter.h b/tools/perf/util/bpf-filter.h
index 36b44c8188ab..4fb33d296d9c 100644
--- a/tools/perf/util/bpf-filter.h
+++ b/tools/perf/util/bpf-filter.h
@@ -9,6 +9,7 @@
 struct perf_bpf_filter_expr {
 	struct list_head list;
 	enum perf_bpf_filter_op op;
+	int part;
 	unsigned long sample_flags;
 	unsigned long val;
 };
@@ -16,7 +17,7 @@ struct perf_bpf_filter_expr {
 struct evsel;
 
 #ifdef HAVE_BPF_SKEL
-struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags,
+struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags, int part,
 						       enum perf_bpf_filter_op op,
 						       unsigned long val);
 int perf_bpf_filter__parse(struct list_head *expr_head, const char *str);
diff --git a/tools/perf/util/bpf-filter.l b/tools/perf/util/bpf-filter.l
index 34c6a9fd4fa4..5117c76c7c7a 100644
--- a/tools/perf/util/bpf-filter.l
+++ b/tools/perf/util/bpf-filter.l
@@ -10,7 +10,15 @@
 
 static int sample(unsigned long sample_flag)
 {
-	perf_bpf_filter_lval.sample = sample_flag;
+	perf_bpf_filter_lval.sample.type = sample_flag;
+	perf_bpf_filter_lval.sample.part = 0;
+	return BFT_SAMPLE;
+}
+
+static int sample_part(unsigned long sample_flag, int part)
+{
+	perf_bpf_filter_lval.sample.type = sample_flag;
+	perf_bpf_filter_lval.sample.part = part;
 	return BFT_SAMPLE;
 }
 
@@ -46,6 +54,7 @@ num_hex		0[Xx][0-9a-fA-F]+
 ip		{ return sample(PERF_SAMPLE_IP); }
 id		{ return sample(PERF_SAMPLE_ID); }
 tid		{ return sample(PERF_SAMPLE_TID); }
+pid		{ return sample_part(PERF_SAMPLE_TID, 1); }
 cpu		{ return sample(PERF_SAMPLE_CPU); }
 time		{ return sample(PERF_SAMPLE_TIME); }
 addr		{ return sample(PERF_SAMPLE_ADDR); }
diff --git a/tools/perf/util/bpf-filter.y b/tools/perf/util/bpf-filter.y
index 510e944a6fa2..0c6035937a6e 100644
--- a/tools/perf/util/bpf-filter.y
+++ b/tools/perf/util/bpf-filter.y
@@ -19,7 +19,10 @@ static void perf_bpf_filter_error(struct list_head *expr __maybe_unused,
 %union
 {
 	unsigned long num;
-	unsigned long sample;
+	struct {
+		unsigned long type;
+		int part;
+	} sample;
 	enum perf_bpf_filter_op op;
 	struct perf_bpf_filter_expr *expr;
 }
@@ -47,7 +50,7 @@ filter_term
 filter_term:
 BFT_SAMPLE BFT_OP BFT_NUM
 {
-	$$ = perf_bpf_filter_expr__new($1, $2, $3);
+	$$ = perf_bpf_filter_expr__new($1.type, $1.part, $2, $3);
 }
 
 %%
diff --git a/tools/perf/util/bpf_skel/sample-filter.h b/tools/perf/util/bpf_skel/sample-filter.h
index 862060bfda14..6b9fd554ad7b 100644
--- a/tools/perf/util/bpf_skel/sample-filter.h
+++ b/tools/perf/util/bpf_skel/sample-filter.h
@@ -17,7 +17,8 @@ enum perf_bpf_filter_op {
 /* BPF map entry for filtering */
 struct perf_bpf_filter_entry {
 	enum perf_bpf_filter_op op;
-	__u64 flags;
+	__u32 part; /* sub-sample type info when it has multiple values */
+	__u64 flags; /* perf sample type flags */
 	__u64 value;
 };
 
diff --git a/tools/perf/util/bpf_skel/sample_filter.bpf.c b/tools/perf/util/bpf_skel/sample_filter.bpf.c
index 1aa6a4cacd51..e9a0633d638d 100644
--- a/tools/perf/util/bpf_skel/sample_filter.bpf.c
+++ b/tools/perf/util/bpf_skel/sample_filter.bpf.c
@@ -32,7 +32,10 @@ static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
 	case PERF_SAMPLE_ID:
 		return kctx->data->id;
 	case PERF_SAMPLE_TID:
-		return kctx->data->tid_entry.tid;
+		if (entry->part)
+			return kctx->data->tid_entry.pid;
+		else
+			return kctx->data->tid_entry.tid;
 	case PERF_SAMPLE_CPU:
 		return kctx->data->cpu_entry.cpu;
 	case PERF_SAMPLE_TIME:
-- 
2.39.2.637.g21b0678d19-goog