perf tools: Add support for PERF_RECORD_TEXT_POKE

Add processing for PERF_RECORD_TEXT_POKE events. When a text poke event
is processed, then the kernel dso data cache is updated with the poked
bytes.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/20200512121922.8997-12-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 396424fcaadf..ffbc9d35a383 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -490,6 +490,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
 		tool->ksymbol = perf_event__process_ksymbol;
 	if (tool->bpf == NULL)
 		tool->bpf = perf_event__process_bpf;
+	if (tool->text_poke == NULL)
+		tool->text_poke = perf_event__process_text_poke;
 	if (tool->read == NULL)
 		tool->read = process_event_sample_stub;
 	if (tool->throttle == NULL)
@@ -659,6 +661,24 @@ static void perf_event__switch_swap(union perf_event *event, bool sample_id_all)
 		swap_sample_id_all(event, &event->context_switch + 1);
 }
 
+static void perf_event__text_poke_swap(union perf_event *event, bool sample_id_all)
+{
+	event->text_poke.addr    = bswap_64(event->text_poke.addr);
+	event->text_poke.old_len = bswap_16(event->text_poke.old_len);
+	event->text_poke.new_len = bswap_16(event->text_poke.new_len);
+
+	if (sample_id_all) {
+		size_t len = sizeof(event->text_poke.old_len) +
+			     sizeof(event->text_poke.new_len) +
+			     event->text_poke.old_len +
+			     event->text_poke.new_len;
+		void *data = &event->text_poke.old_len;
+
+		data += PERF_ALIGN(len, sizeof(u64));
+		swap_sample_id_all(event, data);
+	}
+}
+
 static void perf_event__throttle_swap(union perf_event *event,
 				      bool sample_id_all)
 {
@@ -932,6 +952,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
 	[PERF_RECORD_SWITCH]		  = perf_event__switch_swap,
 	[PERF_RECORD_SWITCH_CPU_WIDE]	  = perf_event__switch_swap,
 	[PERF_RECORD_NAMESPACES]	  = perf_event__namespaces_swap,
+	[PERF_RECORD_TEXT_POKE]		  = perf_event__text_poke_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,
@@ -1474,6 +1495,8 @@ static int machines__deliver_event(struct machines *machines,
 		return tool->ksymbol(tool, event, sample, machine);
 	case PERF_RECORD_BPF_EVENT:
 		return tool->bpf(tool, event, sample, machine);
+	case PERF_RECORD_TEXT_POKE:
+		return tool->text_poke(tool, event, sample, machine);
 	default:
 		++evlist->stats.nr_unknown_events;
 		return -1;