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Subject[Patch 4/4] perf/report: s390 dump counter set data to file.
Date
Add support for the new s390 PMU device cpum_cf_diag to extract
the counter set diagnostic data. This data is available as event
raw data and can be created with this command:

[root@s35lp76 perf]# ./perf record -R -e '{rbd000,rbc000}' --
~/mytests/facultaet 2500
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.009 MB perf.data ]
[root@s35lp76 perf]#

The new event 0xbc000 generated this counter set diagnostic
trace data. The data can be extracted using command:

[root@s35lp76 perf]# ./perf report --stdio --itrace=d
#
# Total Lost Samples: 0
#
# Samples: 21 of events 'anon group { rbd000, rbc000 }'
# Event count (approx.): 21
#
# Overhead Command Shared Object Symbol
# ................ ......... ................. ........................
#
80.95% 0.00% facultaet facultaet [.] facultaet
4.76% 0.00% facultaet [kernel.kallsyms] [k] check_chain_key
4.76% 0.00% facultaet [kernel.kallsyms] [k] ftrace_likely_update
4.76% 0.00% facultaet [kernel.kallsyms] [k] lock_release
4.76% 0.00% facultaet libc-2.26.so [.] _dl_addr
[root@s35lp76 perf]# ll aux*
-rw-r--r-- 1 root root 3408 Oct 16 12:40 aux.ctr.02
-rw-r--r-- 1 root root 4096 Oct 16 12:40 aux.smp.02
[root@s35lp76 perf]#

The files named aux.ctr.## contain the counter set diagnstic
data and the files named aux.smp.## contain the sampling
diagnostic data. ## stand for the CPU number the data was
taken from.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
---
tools/perf/arch/s390/util/trace_event.c | 2 +-
tools/perf/util/s390-cpumcf-kernel.h | 1 +
tools/perf/util/s390-cpumsf.c | 76 +++++++++++++++++++++++++++++++--
3 files changed, 74 insertions(+), 5 deletions(-)

diff --git a/tools/perf/arch/s390/util/trace_event.c b/tools/perf/arch/s390/util/trace_event.c
index f7258d27a559..25a05e707da1 100644
--- a/tools/perf/arch/s390/util/trace_event.c
+++ b/tools/perf/arch/s390/util/trace_event.c
@@ -181,7 +181,7 @@ void arch__trace_event(struct perf_evlist *evlist, union perf_event *event,
return;

ev_bc000 = perf_evlist__event2evsel(evlist, event);
- if (ev_bc000 == NULL || ev_bc000->attr.config != 0xbc000)
+ if (ev_bc000 == NULL || ev_bc000->attr.config != PERF_EVENT_CPUM_CF_DIAG)
return;

/* Display raw data on screen */
diff --git a/tools/perf/util/s390-cpumcf-kernel.h b/tools/perf/util/s390-cpumcf-kernel.h
index 6ae89f8a6efd..fe43c0beb545 100644
--- a/tools/perf/util/s390-cpumcf-kernel.h
+++ b/tools/perf/util/s390-cpumcf-kernel.h
@@ -10,6 +10,7 @@
#define S390_CPUMCF_KERNEL_H

#define S390_CPUMCF_DIAG_DEF 0xfeef /* Counter diagnostic entry ID */
+#define PERF_EVENT_CPUM_CF_DIAG 0xBC000 /* Event: Counter sets */

struct cf_ctrset_entry { /* CPU-M CF counter set entry (8 byte) */
unsigned int def:16; /* 0-15 Data Entry Format */
diff --git a/tools/perf/util/s390-cpumsf.c b/tools/perf/util/s390-cpumsf.c
index a2eeebbfb25f..69d7223bb333 100644
--- a/tools/perf/util/s390-cpumsf.c
+++ b/tools/perf/util/s390-cpumsf.c
@@ -162,6 +162,7 @@
#include "auxtrace.h"
#include "s390-cpumsf.h"
#include "s390-cpumsf-kernel.h"
+#include "s390-cpumcf-kernel.h"
#include "config.h"

struct s390_cpumsf {
@@ -184,8 +185,58 @@ struct s390_cpumsf_queue {
struct auxtrace_buffer *buffer;
int cpu;
FILE *logfile;
+ FILE *logfile_ctr;
};

+/* Check if the raw data should be dumped to file. If this is the case and
+ * the file to dump to has not been opened for writing, do so.
+ *
+ * Return 0 on success and greater zero on error so processing continues.
+ */
+static int s390_cpumcf_dumpctr(struct s390_cpumsf *sf,
+ struct perf_sample *sample)
+{
+ struct s390_cpumsf_queue *sfq;
+ struct auxtrace_queue *q;
+ int rc = 0;
+
+ if (!sf->use_logfile || sf->queues.nr_queues <= sample->cpu)
+ return rc;
+
+ q = &sf->queues.queue_array[sample->cpu];
+ sfq = q->priv;
+ if (!sfq) /* Queue not yet allocated */
+ return rc;
+
+ if (!sfq->logfile_ctr) {
+ char *name;
+
+ rc = (sf->logdir)
+ ? asprintf(&name, "%s/aux.ctr.%02x",
+ sf->logdir, sample->cpu)
+ : asprintf(&name, "aux.ctr.%02x", sample->cpu);
+ if (rc > 0)
+ sfq->logfile_ctr = fopen(name, "w");
+ if (sfq->logfile_ctr == NULL) {
+ pr_err("Failed to open counter set log file %s, "
+ "continue...\n", name);
+ rc = 1;
+ }
+ free(name);
+ }
+
+ if (sfq->logfile_ctr) {
+ /* See comment above for -4 */
+ size_t n = fwrite(sample->raw_data, sample->raw_size - 4, 1,
+ sfq->logfile_ctr);
+ if (n != 1) {
+ pr_err("Failed to write counter set data\n");
+ rc = 1;
+ }
+ }
+ return rc;
+}
+
/* Display s390 CPU measurement facility basic-sampling data entry */
static bool s390_cpumsf_basic_show(const char *color, size_t pos,
struct hws_basic_entry *basic)
@@ -792,7 +843,7 @@ static int s390_cpumsf_lost(struct s390_cpumsf *sf, struct perf_sample *sample)
}

static int
-s390_cpumsf_process_event(struct perf_session *session __maybe_unused,
+s390_cpumsf_process_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
struct perf_tool *tool)
@@ -801,6 +852,7 @@ s390_cpumsf_process_event(struct perf_session *session __maybe_unused,
struct s390_cpumsf,
auxtrace);
u64 timestamp = sample->time;
+ struct perf_evsel *ev_bc000;
int err = 0;

if (dump_trace)
@@ -811,6 +863,16 @@ s390_cpumsf_process_event(struct perf_session *session __maybe_unused,
return -EINVAL;
}

+ if (event->header.type == PERF_RECORD_SAMPLE &&
+ sample->raw_size) {
+ /* Handle event with raw data */
+ ev_bc000 = perf_evlist__event2evsel(session->evlist, event);
+ if (ev_bc000 &&
+ ev_bc000->attr.config == PERF_EVENT_CPUM_CF_DIAG)
+ err = s390_cpumcf_dumpctr(sf, sample);
+ return err;
+ }
+
if (event->header.type == PERF_RECORD_AUX &&
event->aux.flags & PERF_AUX_FLAG_TRUNCATED)
return s390_cpumsf_lost(sf, sample);
@@ -891,9 +953,15 @@ static void s390_cpumsf_free_queues(struct perf_session *session)
struct s390_cpumsf_queue *sfq = (struct s390_cpumsf_queue *)
queues->queue_array[i].priv;

- if (sfq != NULL && sfq->logfile) {
- fclose(sfq->logfile);
- sfq->logfile = NULL;
+ if (sfq != NULL) {
+ if (sfq->logfile) {
+ fclose(sfq->logfile);
+ sfq->logfile = NULL;
+ }
+ if (sfq->logfile_ctr) {
+ fclose(sfq->logfile_ctr);
+ sfq->logfile_ctr = NULL;
+ }
}
zfree(&queues->queue_array[i].priv);
}
--
2.14.3
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