perf record: Add support for PERF_SAMPLE_CODE_PAGE_SIZE

Adds the infrastructure to sample the code address page size.

Introduce a new --code-page-size option for perf record.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Originally-by: Stephane Eranian <eranian@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210105195752.43489-4-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-record.txt

@@ -296,6 +296,9 @@ OPTIONS
 --data-page-size::
 	Record the sampled data address data page size.
 
+--code-page-size::
+	Record the sampled code address (ip) page size
+
 -T::
 --timestamp::
 	Record the sample timestamps. Use it with 'perf report -D' to see the

tools/perf/builtin-record.c

@@ -2477,6 +2477,8 @@ static struct option __record_options[] = {
 		    "Record the sample physical addresses"),
 	OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
 		    "Record the sampled data address data page size"),
+	OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
+		    "Record the sampled code address (ip) page size"),
 	OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
 	OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
 			&record.opts.sample_time_set,

tools/perf/util/event.h

@@ -136,6 +136,7 @@ struct perf_sample {
 	u64 data_src;
 	u64 phys_addr;
 	u64 data_page_size;
+	u64 code_page_size;
 	u64 cgroup;
 	u32 flags;
 	u16 insn_len;

tools/perf/util/evsel.c

@@ -1195,6 +1195,9 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
 	if (opts->sample_data_page_size)
 		evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
 
+	if (opts->sample_code_page_size)
+		evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
+
 	if (opts->record_switch_events)
 		attr->context_switch = track;
 
@@ -1880,7 +1883,12 @@ try_fallback:
 	 * Must probe features in the order they were added to the
 	 * perf_event_attr interface.
 	 */
-        if (!perf_missing_features.data_page_size &&
+	if (!perf_missing_features.code_page_size &&
+	    (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) {
+		perf_missing_features.code_page_size = true;
+		pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n");
+		goto out_close;
+	} else if (!perf_missing_features.data_page_size &&
 	    (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) {
 		perf_missing_features.data_page_size = true;
 		pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n");
@@ -2376,6 +2384,12 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 		array++;
 	}
 
+	data->code_page_size = 0;
+	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
+		data->code_page_size = *array;
+		array++;
+	}
+
 	if (type & PERF_SAMPLE_AUX) {
 		OVERFLOW_CHECK_u64(array);
 		sz = *array++;
@@ -2685,6 +2699,8 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
 	"We found oprofile daemon running, please stop it and try again.");
 		break;
 	case EINVAL:
+		if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
+			return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
 		if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
 			return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
 		if (evsel->core.attr.write_backward && perf_missing_features.write_backward)

tools/perf/util/evsel.h

@@ -149,6 +149,7 @@ struct perf_missing_features {
 	bool branch_hw_idx;
 	bool cgroup;
 	bool data_page_size;
+	bool code_page_size;
 };
 
 extern struct perf_missing_features perf_missing_features;

tools/perf/util/perf_event_attr_fprintf.c

@@ -35,7 +35,7 @@ static void __p_sample_type(char *buf, size_t size, u64 value)
 		bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
 		bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
 		bit_name(WEIGHT), bit_name(PHYS_ADDR), bit_name(AUX),
-		bit_name(CGROUP), bit_name(DATA_PAGE_SIZE),
+		bit_name(CGROUP), bit_name(DATA_PAGE_SIZE), bit_name(CODE_PAGE_SIZE),
 		{ .name = NULL, }
 	};
 #undef bit_name

tools/perf/util/record.h

@@ -23,6 +23,7 @@ struct record_opts {
 	bool	      sample_address;
 	bool	      sample_phys_addr;
 	bool	      sample_data_page_size;
+	bool	      sample_code_page_size;
 	bool	      sample_weight;
 	bool	      sample_time;
 	bool	      sample_time_set;

tools/perf/util/synthetic-events.c

@@ -1473,6 +1473,9 @@ size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
 		result += sizeof(u64);
 
+	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
+		result += sizeof(u64);
+
 	if (type & PERF_SAMPLE_AUX) {
 		result += sizeof(u64);
 		result += sample->aux_sample.size;
@@ -1657,6 +1660,11 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_fo
 		array++;
 	}
 
+	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
+		*array = sample->code_page_size;
+		array++;
+	}
+
 	if (type & PERF_SAMPLE_AUX) {
 		sz = sample->aux_sample.size;
 		*array++ = sz;