[PATCH 13/14] tools/perf: Enable perf script to present the DTL entries

[Athira Rajeev]

Enable perf script to present the DTL entries. Process the
dispatch trace log details in arch_perf_sample__fprintf_synth_evt()
defined in buiultin-script.c file for config value:
PERF_SYNTH_POWERPC_VPA_DTL.

Sample output:

   ./perf record -a -e sched:*,vpa_dtl/dtl_all/ -c 1000000000 sleep 1
   [ perf record: Woken up 1 times to write data ]
   [ perf record: Captured and wrote 0.300 MB perf.data ]

   ./perf script
            perf   13322 [002]   233.835807:                     sched:sched_switch: perf:13322 [120] R ==> migration/2:27 [0]
     migration/2      27 [002]   233.835811:               sched:sched_migrate_task: comm=perf pid=13322 prio=120 orig_cpu=2 dest_cpu=3
     migration/2      27 [002]   233.835818:               sched:sched_stat_runtime: comm=migration/2 pid=27 runtime=9214 [ns]
     migration/2      27 [002]   233.835819:                     sched:sched_switch: migration/2:27 [0] S ==> swapper/2:0 [120]
         swapper       0 [002]   233.835822:                                vpa-dtl: timebase: 338954486062657 dispatch_reason:decrementer_interrupt, preempt_reason:H_CEDE, enqueue_to_dispatch_time:435,			ready_to_enqueue_time:0, waiting_to_ready_time:34775058, processor_id: 202 c0000000000f8094 plpar_hcall_norets_notrace+0x18 ([kernel.kallsyms])
         swapper       0 [001]   233.835886:                                vpa-dtl: timebase: 338954486095398 dispatch_reason:priv_doorbell, preempt_reason:H_CEDE, enqueue_to_dispatch_time:542,			ready_to_enqueue_time:0, waiting_to_ready_time:1245360, processor_id: 201 c0000000000f8094 plpar_hcall_norets_notrace+0x18 ([kernel.kallsyms])

Signed-off-by: Athira Rajeev <atrajeev at linux.ibm.com>
---
 tools/perf/builtin-script.c      | 23 +++++++++++++++++++++--
 tools/perf/util/powerpc-vpadtl.c | 16 ----------------
 tools/perf/util/powerpc-vpadtl.h | 19 +++++++++++++++++++
 3 files changed, 40 insertions(+), 18 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index eff584735980..a0faadaadc4d 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -66,6 +66,7 @@
 #include "util/cgroup.h"
 #include "util/annotate.h"
 #include "perf.h"
+#include "util/powerpc-vpadtl.h"
 
 #include <linux/ctype.h>
 #ifdef HAVE_LIBTRACEEVENT
@@ -2004,8 +2005,26 @@ static int perf_sample__fprintf_synth_iflag_chg(struct perf_sample *sample, FILE
 }
 
 static void arch_perf_sample__fprintf_synth_evt(struct perf_sample *data __maybe_unused,
-		 FILE *fp __maybe_unused, u64 config __maybe_unused)
+		 FILE *fp __maybe_unused, u64 config __maybe_unused, struct perf_env *env)
 {
+	const char *arch = perf_env__arch(env);
+
+	if (!strcmp("powerpc", arch)) {
+		struct dtl_entry *dtl = (struct dtl_entry *)data->raw_data;
+
+		if (config != PERF_SYNTH_POWERPC_VPA_DTL)
+			return;
+		fprintf(fp, "timebase: %" PRIu64 "dispatch_reason:%s, preempt_reason:%s, enqueue_to_dispatch_time:%d,\
+				ready_to_enqueue_time:%d, waiting_to_ready_time:%d, processor_id: %d",\
+				be64_to_cpu(dtl->timebase),
+				dispatch_reasons[dtl->dispatch_reason],
+				preempt_reasons[dtl->preempt_reason],
+				be32_to_cpu(dtl->enqueue_to_dispatch_time),
+				be32_to_cpu(dtl->ready_to_enqueue_time),
+				be32_to_cpu(dtl->waiting_to_ready_time),
+				be16_to_cpu(dtl->processor_id));
+	}
+
 	return;
 }
 
@@ -2032,7 +2051,7 @@ static int perf_sample__fprintf_synth(struct perf_sample *sample,
 	case PERF_SYNTH_INTEL_IFLAG_CHG:
 		return perf_sample__fprintf_synth_iflag_chg(sample, fp);
 	default:
-		arch_perf_sample__fprintf_synth_evt(sample, fp, evsel->core.attr.config);
+		arch_perf_sample__fprintf_synth_evt(sample, fp, evsel->core.attr.config, evsel__env(evsel));
 		break;
 	}
 
diff --git a/tools/perf/util/powerpc-vpadtl.c b/tools/perf/util/powerpc-vpadtl.c
index 370c566f9ac2..482ddf1a2d51 100644
--- a/tools/perf/util/powerpc-vpadtl.c
+++ b/tools/perf/util/powerpc-vpadtl.c
@@ -30,22 +30,6 @@
 #include "symbol.h"
 #include "tool.h"
 
-/*
- * The DTL entries are of below format
- */
-struct dtl_entry {
-	u8      dispatch_reason;
-	u8      preempt_reason;
-	u16     processor_id;
-	u32     enqueue_to_dispatch_time;
-	u32     ready_to_enqueue_time;
-	u32     waiting_to_ready_time;
-	u64     timebase;
-	u64     fault_addr;
-	u64     srr0;
-	u64     srr1;
-};
-
 /*
  * Structure to save the auxtrace queue
  */
diff --git a/tools/perf/util/powerpc-vpadtl.h b/tools/perf/util/powerpc-vpadtl.h
index 625172adaba5..497f704787a5 100644
--- a/tools/perf/util/powerpc-vpadtl.h
+++ b/tools/perf/util/powerpc-vpadtl.h
@@ -20,6 +20,25 @@ union perf_event;
 struct perf_session;
 struct perf_pmu;
 
+/*
+ * The DTL entries are of below format
+ */
+struct dtl_entry {
+	u8      dispatch_reason;
+	u8      preempt_reason;
+	u16     processor_id;
+	u32     enqueue_to_dispatch_time;
+	u32     ready_to_enqueue_time;
+	u32     waiting_to_ready_time;
+	u64     timebase;
+	u64     fault_addr;
+	u64     srr0;
+	u64     srr1;
+};
+
+extern const char *dispatch_reasons[11];
+extern const char *preempt_reasons[10];
+
 int powerpc_vpadtl_process_auxtrace_info(union perf_event *event,
 				  struct perf_session *session);
 
-- 
2.47.1