Commit 069ca70e authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf intel-pt: Synthesize iflag event 



Synthesize an attribute event and sample events for changes to the
interrupt flag represented by the MODE.Exec packet.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20220124084201.2699795-16-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ef3b2ba9

tools/perf/util/intel-pt.c

+52 −0
Original line number Diff line number Diff line
@@ -124,6 +124,9 @@ struct intel_pt { 
	u64 evt_sample_type;

	u64 evt_id;



	u64 iflag_chg_sample_type;

	u64 iflag_chg_id;



	u64 tsc_bit;

	u64 mtc_bit;

	u64 mtc_freq_bits;
@@ -2209,6 +2212,39 @@ static int intel_pt_synth_events_sample(struct intel_pt_queue *ptq) 
					    pt->evt_sample_type);

}



static int intel_pt_synth_iflag_chg_sample(struct intel_pt_queue *ptq)

{

	struct intel_pt *pt = ptq->pt;

	union perf_event *event = ptq->event_buf;

	struct perf_sample sample = { .ip = 0, };

	struct perf_synth_intel_iflag_chg raw;



	if (intel_pt_skip_event(pt))

		return 0;



	intel_pt_prep_p_sample(pt, ptq, event, &sample);



	sample.id = ptq->pt->iflag_chg_id;

	sample.stream_id = ptq->pt->iflag_chg_id;



	raw.flags = 0;

	raw.iflag = ptq->state->to_iflag;



	if (ptq->state->type & INTEL_PT_BRANCH) {

		raw.via_branch = 1;

		raw.branch_ip = ptq->state->to_ip;

	} else {

		sample.addr = 0;

	}

	sample.flags = ptq->flags;



	sample.raw_size = perf_synth__raw_size(raw);

	sample.raw_data = perf_synth__raw_data(&raw);



	return intel_pt_deliver_synth_event(pt, event, &sample,

					    pt->iflag_chg_sample_type);

}



static int intel_pt_synth_error(struct intel_pt *pt, int code, int cpu,

				pid_t pid, pid_t tid, u64 ip, u64 timestamp)

{
@@ -2321,6 +2357,11 @@ static int intel_pt_sample(struct intel_pt_queue *ptq) 
			if (err)

				return err;

		}

		if (state->type & INTEL_PT_IFLAG_CHG) {

			err = intel_pt_synth_iflag_chg_sample(ptq);

			if (err)

				return err;

		}

	}



	if (pt->sample_pwr_events) {
@@ -3531,6 +3572,17 @@ static int intel_pt_synth_events(struct intel_pt *pt, 
		id += 1;

	}



	if (pt->synth_opts.intr_events && pt->cap_event_trace) {

		attr.config = PERF_SYNTH_INTEL_IFLAG_CHG;

		err = intel_pt_synth_event(session, "iflag", &attr, id);

		if (err)

			return err;

		pt->iflag_chg_sample_type = attr.sample_type;

		pt->iflag_chg_id = id;

		intel_pt_set_event_name(evlist, id, "iflag");

		id += 1;

	}



	return 0;

}