perf intel-pt: Record Event Trace capability flag

The change to the MODE.Exec packet means processing must distinguish
between the old and new cases. Record the Event Trace capability flag to
make that possible.

Signed-off-by: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/arch/x86/util/intel-pt.c

···
 
 	ptr->priv_size = (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64)) +
 			 intel_pt_filter_bytes(filter);
+	ptr->priv_size += sizeof(u64); /* Cap Event Trace */
 
 	return ptr->priv_size;
 }
···
 	unsigned long max_non_turbo_ratio;
 	size_t filter_str_len;
 	const char *filter;
+	int event_trace;
 	__u64 *info;
 	int err;
 
···
 	if (perf_pmu__scan_file(intel_pt_pmu, "max_nonturbo_ratio",
 				"%lu", &max_non_turbo_ratio) != 1)
 		max_non_turbo_ratio = 0;
+	if (perf_pmu__scan_file(intel_pt_pmu, "caps/event_trace",
+				"%d", &event_trace) != 1)
+		event_trace = 0;
 
 	filter = intel_pt_find_filter(session->evlist, ptr->intel_pt_pmu);
 	filter_str_len = filter ? strlen(filter) : 0;
···
 		strncpy((char *)info, filter, len);
 		info += len >> 3;
 	}
+
+	*info++ = event_trace;
 
 	return 0;
 }

tools/perf/util/intel-pt.c

···
 	bool mispred_all;
 	bool use_thread_stack;
 	bool callstack;
+	bool cap_event_trace;
 	unsigned int br_stack_sz;
 	unsigned int br_stack_sz_plus;
 	int have_sched_switch;
···
 	}
 
 	info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1;
-	info_end = (void *)info + auxtrace_info->header.size;
+	info_end = (void *)auxtrace_info + auxtrace_info->header.size;
 
 	if (intel_pt_has(auxtrace_info, INTEL_PT_FILTER_STR_LEN)) {
 		size_t len;
···
 				goto err_free_queues;
 		}
 		intel_pt_print_info_str("Filter string", pt->filter);
+	}
+
+	if ((void *)info < info_end) {
+		pt->cap_event_trace = *info++;
+		if (dump_trace)
+			fprintf(stdout, "  Cap Event Trace     %d\n",
+				pt->cap_event_trace);
 	}
 
 	pt->timeless_decoding = intel_pt_timeless_decoding(pt);