1 files changed, 144 insertions, 0 deletions
diff --git a/tools/perf/dlfilters/dlfilter-show-cycles.c b/tools/perf/dlfilters/dlfilter-show-cycles.c
new file mode 100644
index 000000000000..6d47298ebe9f
--- /dev/null
+++ b/tools/perf/dlfilters/dlfilter-show-cycles.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dlfilter-show-cycles.c: Print the number of cycles at the start of each line
+ * Copyright (c) 2021, Intel Corporation.
+ */
+#include <perf/perf_dlfilter.h>
+#include <string.h>
+#include <stdio.h>
+
+#define MAX_CPU 4096
+
+enum {
+	INSTR_CYC,
+	BRNCH_CYC,
+	OTHER_CYC,
+	MAX_ENTRY
+};
+
+static __u64 cycles[MAX_CPU][MAX_ENTRY];
+static __u64 cycles_rpt[MAX_CPU][MAX_ENTRY];
+
+#define BITS		16
+#define TABLESZ		(1 << BITS)
+#define TABLEMAX	(TABLESZ / 2)
+#define MASK		(TABLESZ - 1)
+
+static struct entry {
+	__u32 used;
+	__s32 tid;
+	__u64 cycles[MAX_ENTRY];
+	__u64 cycles_rpt[MAX_ENTRY];
+} table[TABLESZ];
+
+static int tid_cnt;
+
+static int event_entry(const char *event)
+{
+	if (!event)
+		return OTHER_CYC;
+	if (!strncmp(event, "instructions", 12))
+		return INSTR_CYC;
+	if (!strncmp(event, "branches", 8))
+		return BRNCH_CYC;
+	return OTHER_CYC;
+}
+
+static struct entry *find_entry(__s32 tid)
+{
+	__u32 pos = tid & MASK;
+	struct entry *e;
+
+	e = &table[pos];
+	while (e->used) {
+		if (e->tid == tid)
+			return e;
+		if (++pos == TABLESZ)
+			pos = 0;
+		e = &table[pos];
+	}
+
+	if (tid_cnt >= TABLEMAX) {
+		fprintf(stderr, "Too many threads\n");
+		return NULL;
+	}
+
+	tid_cnt += 1;
+	e->used = 1;
+	e->tid = tid;
+	return e;
+}
+
+static void add_entry(__s32 tid, int pos, __u64 cnt)
+{
+	struct entry *e = find_entry(tid);
+
+	if (e)
+		e->cycles[pos] += cnt;
+}
+
+int filter_event_early(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
+{
+	__s32 cpu = sample->cpu;
+	__s32 tid = sample->tid;
+	int pos;
+
+	if (!sample->cyc_cnt)
+		return 0;
+
+	pos = event_entry(sample->event);
+
+	if (cpu >= 0 && cpu < MAX_CPU)
+		cycles[cpu][pos] += sample->cyc_cnt;
+	else if (tid != -1)
+		add_entry(tid, pos, sample->cyc_cnt);
+	return 0;
+}
+
+static void print_vals(__u64 cycles, __u64 delta)
+{
+	if (delta)
+		printf("%10llu %10llu ", (unsigned long long)cycles, (unsigned long long)delta);
+	else
+		printf("%10llu %10s ", (unsigned long long)cycles, "");
+}
+
+int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
+{
+	__s32 cpu = sample->cpu;
+	__s32 tid = sample->tid;
+	int pos;
+
+	pos = event_entry(sample->event);
+
+	if (cpu >= 0 && cpu < MAX_CPU) {
+		print_vals(cycles[cpu][pos], cycles[cpu][pos] - cycles_rpt[cpu][pos]);
+		cycles_rpt[cpu][pos] = cycles[cpu][pos];
+		return 0;
+	}
+
+	if (tid != -1) {
+		struct entry *e = find_entry(tid);
+
+		if (e) {
+			print_vals(e->cycles[pos], e->cycles[pos] - e->cycles_rpt[pos]);
+			e->cycles_rpt[pos] = e->cycles[pos];
+			return 0;
+		}
+	}
+
+	printf("%22s", "");
+	return 0;
+}
+
+const char *filter_description(const char **long_description)
+{
+	static char *long_desc = "Cycle counts are accumulated per CPU (or "
+		"per thread if CPU is not recorded) from IPC information, and "
+		"printed together with the change since the last print, at the "
+		"start of each line. Separate counts are kept for branches, "
+		"instructions or other events.";
+
+	*long_description = long_desc;
+	return "Print the number of cycles at the start of each line";
+}