[PATCH RFC 04/10] perf,tools: New RECORD type PERF_RECORD_COUNTER_READ

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxx>

Introduce a new user RECORD type PERF_RECORD_COUNTER_READ to store the
counter statistics result.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
---
 tools/perf/util/event.c   |  1 +
 tools/perf/util/event.h   | 18 ++++++++++++++++++
 tools/perf/util/session.c | 16 ++++++++++++++++
 tools/perf/util/tool.h    |  1 +
 4 files changed, 36 insertions(+)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 497157a..608c83a 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -37,6 +37,7 @@ static const char *perf_event__names[] = {
 	[PERF_RECORD_AUXTRACE_INFO]		= "AUXTRACE_INFO",
 	[PERF_RECORD_AUXTRACE]			= "AUXTRACE",
 	[PERF_RECORD_AUXTRACE_ERROR]		= "AUXTRACE_ERROR",
+	[PERF_RECORD_COUNTER_READ]		= "COUNTER_READ",
 };
 
 const char *perf_event__name(unsigned int id)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index f729df5..7f125ce 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -226,6 +226,7 @@ enum perf_user_event_type { /* above any possible kernel type */
 	PERF_RECORD_AUXTRACE_INFO		= 70,
 	PERF_RECORD_AUXTRACE			= 71,
 	PERF_RECORD_AUXTRACE_ERROR		= 72,
+	PERF_RECORD_COUNTER_READ		= 73,
 	PERF_RECORD_HEADER_MAX
 };
 
@@ -355,6 +356,22 @@ struct context_switch_event {
 	u32 next_prev_tid;
 };
 
+struct counter_read_event {
+	struct perf_event_header header;
+
+	int	idx;
+	u32	cpu;
+
+	union {
+		struct {
+			u64 val;
+			u64 ena;
+			u64 run;
+		};
+		u64 values[3];
+	};
+};
+
 union perf_event {
 	struct perf_event_header	header;
 	struct mmap_event		mmap;
@@ -377,6 +394,7 @@ union perf_event {
 	struct aux_event		aux;
 	struct itrace_start_event	itrace_start;
 	struct context_switch_event	context_switch;
+	struct counter_read_event	counter_read;
 };
 
 void perf_event__print_totals(void);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index d1a43a3..4d5c644 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -322,6 +322,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
 		tool->context_switch = perf_event__process_switch;
 	if (tool->read == NULL)
 		tool->read = process_event_sample_stub;
+	if (tool->counter_read == NULL)
+		tool->counter_read = process_build_id_stub;
 	if (tool->throttle == NULL)
 		tool->throttle = process_event_stub;
 	if (tool->unthrottle == NULL)
@@ -425,6 +427,17 @@ static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 		swap_sample_id_all(event, &event->fork + 1);
 }
 
+static void perf_event__counter_read_swap(union perf_event *event,
+				       bool sample_id_all __maybe_unused)
+{
+	event->counter_read.idx = bswap_32(event->counter_read.idx);
+	event->counter_read.cpu = bswap_32(event->counter_read.cpu);
+
+	event->counter_read.val = bswap_64(event->counter_read.val);
+	event->counter_read.ena = bswap_64(event->counter_read.ena);
+	event->counter_read.run = bswap_64(event->counter_read.run);
+}
+
 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 {
 	event->read.pid		 = bswap_32(event->read.pid);
@@ -627,6 +640,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
 	[PERF_RECORD_EXIT]		  = perf_event__task_swap,
 	[PERF_RECORD_LOST]		  = perf_event__all64_swap,
 	[PERF_RECORD_READ]		  = perf_event__read_swap,
+	[PERF_RECORD_COUNTER_READ]	  = perf_event__counter_read_swap,
 	[PERF_RECORD_THROTTLE]		  = perf_event__throttle_swap,
 	[PERF_RECORD_UNTHROTTLE]	  = perf_event__throttle_swap,
 	[PERF_RECORD_SAMPLE]		  = perf_event__all64_swap,
@@ -1176,6 +1190,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
 	case PERF_RECORD_AUXTRACE_ERROR:
 		perf_session__auxtrace_error_inc(session, event);
 		return tool->auxtrace_error(tool, event, session);
+	case PERF_RECORD_COUNTER_READ:
+		return tool->counter_read(tool, event, session);
 	default:
 		return -EINVAL;
 	}
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index cab8cc2..89477b2 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -57,6 +57,7 @@ struct perf_tool {
 			auxtrace_info,
 			auxtrace_error;
 	event_op3	auxtrace;
+	event_op2	counter_read;
 	bool		ordered_events;
 	bool		ordering_requires_timestamps;
 };
-- 
1.8.3.1

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