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Subject[PATCH V2 2/3] perf tools: Add support for PERF_RECORD_AUX_OUTPUT_HW_ID
Date
The PERF_RECORD_AUX_OUTPUT_HW_ID event provides a way to match AUX output
data like Intel PT PEBS-via-PT back to the event that it came from, by
providing a hardware ID that is present in the AUX output.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
---
tools/include/uapi/linux/perf_event.h | 15 +++++++++++++++
tools/lib/perf/include/perf/event.h | 6 ++++++
tools/perf/builtin-inject.c | 4 +++-
tools/perf/builtin-record.c | 2 +-
tools/perf/util/event.c | 18 ++++++++++++++++++
tools/perf/util/event.h | 5 +++++
tools/perf/util/machine.c | 10 ++++++++++
tools/perf/util/machine.h | 2 ++
tools/perf/util/session.c | 5 +++++
tools/perf/util/tool.h | 1 +
10 files changed, 66 insertions(+), 2 deletions(-)

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index f92880a15645..c89535de1ec8 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -1141,6 +1141,21 @@ enum perf_event_type {
*/
PERF_RECORD_TEXT_POKE = 20,

+ /*
+ * Data written to the AUX area by hardware due to aux_output, may need
+ * to be matched to the event by an architecture-specific hardware ID.
+ * This records the hardware ID, but requires sample_id to provide the
+ * event ID. e.g. Intel PT uses this record to disambiguate PEBS-via-PT
+ * records from multiple events.
+ *
+ * struct {
+ * struct perf_event_header header;
+ * u64 hw_id;
+ * struct sample_id sample_id;
+ * };
+ */
+ PERF_RECORD_AUX_OUTPUT_HW_ID = 21,
+
PERF_RECORD_MAX, /* non-ABI */
};

diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index 095d60144a70..acc4fa065ec7 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -289,6 +289,11 @@ struct perf_record_itrace_start {
__u32 tid;
};

+struct perf_record_aux_output_hw_id {
+ struct perf_event_header header;
+ __u64 hw_id;
+};
+
struct perf_record_thread_map_entry {
__u64 pid;
char comm[16];
@@ -414,6 +419,7 @@ union perf_event {
struct perf_record_auxtrace_error auxtrace_error;
struct perf_record_aux aux;
struct perf_record_itrace_start itrace_start;
+ struct perf_record_aux_output_hw_id aux_output_hw_id;
struct perf_record_switch context_switch;
struct perf_record_thread_map thread_map;
struct perf_record_cpu_map cpu_map;
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index ddccc0eb7390..3e8eae33f52e 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -747,7 +747,8 @@ static int __cmd_inject(struct perf_inject *inject)
inject->tool.auxtrace_info = perf_event__process_auxtrace_info;
inject->tool.auxtrace = perf_event__process_auxtrace;
inject->tool.aux = perf_event__drop_aux;
- inject->tool.itrace_start = perf_event__drop_aux,
+ inject->tool.itrace_start = perf_event__drop_aux;
+ inject->tool.aux_output_hw_id = perf_event__drop_aux;
inject->tool.ordered_events = true;
inject->tool.ordering_requires_timestamps = true;
/* Allow space in the header for new attributes */
@@ -814,6 +815,7 @@ int cmd_inject(int argc, const char **argv)
.lost_samples = perf_event__repipe,
.aux = perf_event__repipe,
.itrace_start = perf_event__repipe,
+ .aux_output_hw_id = perf_event__repipe,
.context_switch = perf_event__repipe,
.throttle = perf_event__repipe,
.unthrottle = perf_event__repipe,
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 3337b5f93336..59d4202939b6 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1431,7 +1431,7 @@ static int record__synthesize(struct record *rec, bool tail)
goto out;

/* Synthesize id_index before auxtrace_info */
- if (rec->opts.auxtrace_sample_mode) {
+ if (rec->opts.auxtrace_sample_mode || rec->opts.full_auxtrace) {
err = perf_event__synthesize_id_index(tool,
process_synthesized_event,
session->evlist, machine);
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index ac706304afe9..fe24801f8e9f 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -57,6 +57,7 @@ static const char *perf_event__names[] = {
[PERF_RECORD_BPF_EVENT] = "BPF_EVENT",
[PERF_RECORD_CGROUP] = "CGROUP",
[PERF_RECORD_TEXT_POKE] = "TEXT_POKE",
+ [PERF_RECORD_AUX_OUTPUT_HW_ID] = "AUX_OUTPUT_HW_ID",
[PERF_RECORD_HEADER_ATTR] = "ATTR",
[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
@@ -237,6 +238,14 @@ int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
return machine__process_itrace_start_event(machine, event);
}

+int perf_event__process_aux_output_hw_id(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample __maybe_unused,
+ struct machine *machine)
+{
+ return machine__process_aux_output_hw_id_event(machine, event);
+}
+
int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
@@ -407,6 +416,12 @@ size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
event->itrace_start.pid, event->itrace_start.tid);
}

+size_t perf_event__fprintf_aux_output_hw_id(union perf_event *event, FILE *fp)
+{
+ return fprintf(fp, " hw_id: %#"PRI_lx64"\n",
+ event->aux_output_hw_id.hw_id);
+}
+
size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
{
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
@@ -534,6 +549,9 @@ size_t perf_event__fprintf(union perf_event *event, struct machine *machine, FIL
case PERF_RECORD_TEXT_POKE:
ret += perf_event__fprintf_text_poke(event, machine, fp);
break;
+ case PERF_RECORD_AUX_OUTPUT_HW_ID:
+ ret += perf_event__fprintf_aux_output_hw_id(event, fp);
+ break;
default:
ret += fprintf(fp, "\n");
}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 19ad64f2bd83..95ffed66369c 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -330,6 +330,10 @@ int perf_event__process_itrace_start(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine);
+int perf_event__process_aux_output_hw_id(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine);
int perf_event__process_switch(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
@@ -397,6 +401,7 @@ size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_task(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp);
+size_t perf_event__fprintf_aux_output_hw_id(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 3ff4936a15a4..dad2e89095d7 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -755,6 +755,14 @@ int machine__process_itrace_start_event(struct machine *machine __maybe_unused,
return 0;
}

+int machine__process_aux_output_hw_id_event(struct machine *machine __maybe_unused,
+ union perf_event *event)
+{
+ if (dump_trace)
+ perf_event__fprintf_aux_output_hw_id(event, stdout);
+ return 0;
+}
+
int machine__process_switch_event(struct machine *machine __maybe_unused,
union perf_event *event)
{
@@ -2027,6 +2035,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
ret = machine__process_bpf(machine, event, sample); break;
case PERF_RECORD_TEXT_POKE:
ret = machine__process_text_poke(machine, event, sample); break;
+ case PERF_RECORD_AUX_OUTPUT_HW_ID:
+ ret = machine__process_aux_output_hw_id_event(machine, event); break;
default:
ret = -1;
break;
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 7377ed6efdf1..a143087eeb47 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -124,6 +124,8 @@ int machine__process_aux_event(struct machine *machine,
union perf_event *event);
int machine__process_itrace_start_event(struct machine *machine,
union perf_event *event);
+int machine__process_aux_output_hw_id_event(struct machine *machine,
+ union perf_event *event);
int machine__process_switch_event(struct machine *machine,
union perf_event *event);
int machine__process_namespaces_event(struct machine *machine,
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 106b3d60881a..b2db3de0271c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -504,6 +504,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
tool->bpf = perf_event__process_bpf;
if (tool->text_poke == NULL)
tool->text_poke = perf_event__process_text_poke;
+ if (tool->aux_output_hw_id == NULL)
+ tool->aux_output_hw_id = perf_event__process_aux_output_hw_id;
if (tool->read == NULL)
tool->read = process_event_sample_stub;
if (tool->throttle == NULL)
@@ -995,6 +997,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
[PERF_RECORD_NAMESPACES] = perf_event__namespaces_swap,
[PERF_RECORD_CGROUP] = perf_event__cgroup_swap,
[PERF_RECORD_TEXT_POKE] = perf_event__text_poke_swap,
+ [PERF_RECORD_AUX_OUTPUT_HW_ID] = perf_event__all64_swap,
[PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap,
[PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
[PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
@@ -1549,6 +1552,8 @@ static int machines__deliver_event(struct machines *machines,
return tool->bpf(tool, event, sample, machine);
case PERF_RECORD_TEXT_POKE:
return tool->text_poke(tool, event, sample, machine);
+ case PERF_RECORD_AUX_OUTPUT_HW_ID:
+ return tool->aux_output_hw_id(tool, event, sample, machine);
default:
++evlist->stats.nr_unknown_events;
return -1;
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index bbbc0dcd461f..ef873f2cc38f 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -53,6 +53,7 @@ struct perf_tool {
lost_samples,
aux,
itrace_start,
+ aux_output_hw_id,
context_switch,
throttle,
unthrottle,
--
2.17.1
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