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perf powerpc: Add event name as vpa-dtl of PERF_TYPE_SYNTH type to present DTL samples

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Dispatch Trace Log details are captured as-is in PERF_RECORD_AUXTRACE
records.

To present dtl entries as samples, create an event with name as
"vpa-dtl" and type PERF_TYPE_SYNTH.

Add perf_synth_id, "PERF_SYNTH_POWERPC_VPA_DTL" as config value for the
event.

Create a sample id to be a fixed offset from evsel id.

To present the relevant fields from the "struct dtl_entry", prepare the
entries as events of type PERF_TYPE_SYNTH.

By defining as PERF_TYPE_SYNTH type, samples can be printed as part of
perf_sample__fprintf_synth in builtin-script.c

From powerpc_vpadtl_process_auxtrace_info(), invoke
auxtrace_queues__process_index() function which will queue the auxtrace
buffers by invoke auxtrace_queues__add_event().

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Tejas Manhas <tejas05@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: Aboorva Devarajan <aboorvad@linux.ibm.com>
Cc: Aditya Bodkhe <Aditya.Bodkhe1@ibm.com>
Cc: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Athira Rajeev 2025-09-16 10:55:33 +05:30 committed by Arnaldo Carvalho de Melo
parent c4bbd4ec2e
commit 71feffa9c0
2 changed files with 77 additions and 0 deletions
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1
tools/perf/util/event.h
View File

@ -117,6 +117,7 @@ enum perf_synth_id {
PERF_SYNTH_INTEL_PSB,
PERF_SYNTH_INTEL_EVT,
PERF_SYNTH_INTEL_IFLAG_CHG,
PERF_SYNTH_POWERPC_VPA_DTL,
};
/*

76
tools/perf/util/powerpc-vpadtl.c
View File

@ -3,6 +3,7 @@
* VPA DTL PMU support
*/
#include <linux/string.h>
#include <inttypes.h>
#include "color.h"
#include "evlist.h"
@ -24,6 +25,7 @@ struct powerpc_vpadtl {
struct perf_session *session;
struct machine *machine;
u32 pmu_type;
u64 sample_id;
};
struct boottb_freq {
@ -215,6 +217,65 @@ static void powerpc_vpadtl_print_info(__u64 *arr)
fprintf(stdout, powerpc_vpadtl_info_fmts[POWERPC_VPADTL_TYPE], arr[POWERPC_VPADTL_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);
break;
}
}
}
static int
powerpc_vpadtl_synth_events(struct powerpc_vpadtl *vpa, 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, "vpa_dtl")) {
found = true;
break;
}
}
if (!found) {
pr_debug("No selected events with VPA 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_VPA_DTL;
/* 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;
vpa->sample_id = id;
set_event_name(evlist, id, "vpa-dtl");
return 0;
}
/*
* Process the PERF_RECORD_AUXTRACE_INFO records and setup
* the infrastructure to process auxtrace events. PERF_RECORD_AUXTRACE_INFO
@ -256,8 +317,23 @@ int powerpc_vpadtl_process_auxtrace_info(union perf_event *event,
powerpc_vpadtl_print_info(&auxtrace_info->priv[0]);
if (dump_trace)
return 0;
err = powerpc_vpadtl_synth_events(vpa, session);
if (err)
goto err_free_queues;
err = auxtrace_queues__process_index(&vpa->queues, session);
if (err)
goto err_free_queues;
return 0;
err_free_queues:
auxtrace_queues__free(&vpa->queues);
session->auxtrace = NULL;
err_free:
free(vpa);
return err;