[PATCH 8/9] tools/perf/powerpc: Add event name as htm of PERF_TYPE_SYNTH type to present htm samples

[Athira Rajeev <atrajeev@linux.ibm.com>]

HTM trace details are captured as-is in PERF_RECORD_AUXTRACE
records. To present htm entries as samples, create an event
with name as "htm" and type PERF_TYPE_SYNTH.

Add perf_synth_id, "PERF_SYNTH_POWERPC_HTM" as config value for the
event. Create a sample id to be a fixed offset from evsel id.
Invoke powerpc_htm_create_sample() using the logical address
as sample ip.

This will help in understanding hot logical address from the
traces.

Usage:

 # perf record -C 1 -e htm/nodalchipindex=2,nodeindex=0,htm_type=1/ -o perf_1.data ls 1>out
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 257.504 MB perf_1.data ]

 # ./perf report -i perf_1.data

 # Samples: 8M of event 'htm'
 # Event count (approx.): 8515199
 #
 # Children      Self  Command  Shared Object     Symbol
 # ........  ........  .......  ................  ......................
 #
     0.61%     0.61%  swapper  [unknown]         [.] 0x00000006fd567fe0
     0.33%     0.33%  swapper  [unknown]         [.] 0x00000006fc194b20
     0.20%     0.20%  swapper  [unknown]         [.] 0x0000000066113f80
     0.18%     0.18%  swapper  [unknown]         [.] 0x00000007fd888f20
     0.15%     0.15%  swapper  [unknown]         [.] 0x00000006fd567fc0
     0.08%     0.08%  swapper  [unknown]         [.] 0x00000006fc194b00
     0.05%     0.05%  swapper  [unknown]         [.] 0x00000007fd888f00
     0.03%     0.03%  swapper  [unknown]         [.] 0x0000000422510700
     0.03%     0.03%  swapper  [unknown]         [.] 0x0000000422510820
     0.03%     0.03%  swapper  [unknown]         [.] 0x00000007fd888b80
     0.02%     0.02%  swapper  [unknown]         [.] 0x000000000a0ece40
     0.02%     0.02%  swapper  [unknown]         [.] 0x000000000a0ed2e0
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd888c40
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd889000
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd5bc200
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd61c200
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd28c200
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd22c200
     0.01%     0.01%  swapper  [unknown]         [.] 0x00000007fd1fc200

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
---
 tools/perf/util/event.h       |   1 +
 tools/perf/util/powerpc-htm.c | 110 +++++++++++++++++++++++++++++++++-
 2 files changed, 109 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 2ea83fdf8a03..f5aa7eb9f5b7 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -118,6 +118,7 @@ enum perf_synth_id {
 	PERF_SYNTH_INTEL_EVT,
 	PERF_SYNTH_INTEL_IFLAG_CHG,
 	PERF_SYNTH_POWERPC_VPA_DTL,
+	PERF_SYNTH_POWERPC_HTM,
 };
 
 /*
diff --git a/tools/perf/util/powerpc-htm.c b/tools/perf/util/powerpc-htm.c
index 83253850870c..050fbceac71e 100644
--- a/tools/perf/util/powerpc-htm.c
+++ b/tools/perf/util/powerpc-htm.c
@@ -42,6 +42,7 @@ struct powerpc_htm {
 	char				trans_file[64];
 	int				htm_mem_entries;
 	int				mem_maps;
+	u64				sample_id;
 };
 
 struct htm_mem {
@@ -128,6 +129,43 @@ static int run_htmdecode(const char *input_file, const char *output_file)
 	return 0;
 }
 
+static int powerpc_htm_create_sample(unsigned long addr, struct perf_session *session,
+		struct powerpc_htm *htm)
+{
+	struct perf_sample sample;
+	union perf_event event;
+
+	if (dump_trace)
+		return 0;
+
+	memset(&sample, 0, sizeof(sample));
+	sample.cpumode = PERF_RECORD_MISC_USER;
+
+	if (!addr)
+		return 0;
+
+	if (addr >= 0xc000000000000000)
+		sample.cpumode = PERF_RECORD_MISC_KERNEL;
+
+	sample.ip = addr;
+	sample.period = 1;
+	sample.cpu = 0;
+	sample.id = htm->sample_id;
+	sample.callchain = NULL;
+	sample.branch_stack = NULL;
+	memset(&event, 0, sizeof(event));
+	event.sample.header.type = PERF_RECORD_SAMPLE;
+	event.sample.header.misc = sample.cpumode;
+	event.sample.header.size = sizeof(struct perf_event_header);
+
+	if (perf_session__deliver_synth_event(session, &event, &sample)) {
+		pr_debug("Failed to create sample for htm entry\n");
+		return -1;
+	}
+
+	return 0;
+}
+
 static void *safe_realloc(void *ptr, size_t new_size)
 {
 	void *tmp = realloc(ptr, new_size);
@@ -309,7 +347,7 @@ static struct addr_map *process_trace_file(const char *trace_file,
 	return maps;
 }
 
-static int create_mem_maps(struct powerpc_htm *htm)
+static int create_mem_maps(struct perf_session *session, struct powerpc_htm *htm)
 {
 	off_t file_size;
 	void *htmdata, *mapped_data;
@@ -422,6 +460,7 @@ static int create_mem_maps(struct powerpc_htm *htm)
 			maps[i].event,
 			maps[i].phys_addr,
 			(unsigned long)maps[i].logical_addr);
+		powerpc_htm_create_sample(maps[i].logical_addr, session, htm);
 	}
 
 	free(maps);
@@ -581,7 +620,7 @@ static int powerpc_htm_process_event(struct perf_session *session __maybe_unused
 		}
 		/* Only for power bus traces, we decode traces */
 		if (config == 1)
-			create_mem_maps(htm);
+			create_mem_maps(session, htm);
 	}
 
 	return 0;
@@ -636,6 +675,69 @@ static void powerpc_htm_print_info(__u64 *arr)
 	fprintf(stdout, powerpc_htm_info_fmts[POWERPC_HTM_TYPE], arr[POWERPC_HTM_TYPE]);
 }
 
+static void set_event_name(struct evlist *evlist, u64 id,
+			const char *name)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel->core.id && evsel->core.id[0] == id) {
+			if (evsel->name)
+				zfree(&evsel->name);
+			evsel->name = strdup(name);
+			if (!evsel->name) {
+				pr_err("Failed to allocate memory for event name\n");
+				return;
+			}
+			break;
+		}
+	}
+}
+
+static int
+powerpc_htm_synth_events(struct powerpc_htm *htm, struct perf_session *session)
+{
+	struct evlist *evlist = session->evlist;
+	struct evsel *evsel;
+	struct perf_event_attr attr;
+	bool found = false;
+	u64 id;
+	int err;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (strstarts(evsel->name, "htm")) {
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		pr_debug("No selected events with HTM trace data\n");
+		return 0;
+	}
+
+	memset(&attr, 0, sizeof(struct perf_event_attr));
+	attr.size = sizeof(struct perf_event_attr);
+	attr.sample_type = evsel->core.attr.sample_type;
+	attr.sample_id_all = evsel->core.attr.sample_id_all;
+	attr.type = PERF_TYPE_SYNTH;
+	attr.config = PERF_SYNTH_POWERPC_HTM;
+
+	/* create new id val to be a fixed offset from evsel id */
+	id = evsel->core.id[0] + 1000000000;
+	if (!id)
+		id = 1;
+
+	err = perf_session__deliver_synth_attr_event(session, &attr, id);
+	if (err)
+		return err;
+
+	htm->sample_id = id;
+	set_event_name(evlist, id, "htm");
+
+	return 0;
+}
+
 int powerpc_htm_process_auxtrace_info(union perf_event *event,
 				  struct perf_session *session)
 {
@@ -698,6 +800,10 @@ int powerpc_htm_process_auxtrace_info(union perf_event *event,
 	if (err)
 		goto err_free_queues;
 
+	err = powerpc_htm_synth_events(htm, session);
+	if (err)
+		goto err_free;
+
 	return 0;
 
 err_free_queues:
-- 
2.52.0