perf test session topology: Fix test to skip the test in guest environment

The session topology test fails in powerpc pSeries platform.

Test logs:

  <<>>
  Session topology : FAILED!
  <<>>

This testcases tests cpu topology by checking the core_id and socket_id
stored in perf_env from perf session. The data from perf session is
compared with the cpu topology information from
"/sys/devices/system/cpu/cpuX/topology" like core_id,
physical_package_id.

In case of virtual environment, detail like physical_package_id is
restricted to be exposed. Hence physical_package_id is set to -1. The
testcase fails on such platforms since socket_id can't be fetched from
topology info.

Skip the testcase in powerpc if physical_package_id returns -1.

Reviewed-by: Kajol Jain <[email protected]>
Signed-off-by: Athira Rajeev <[email protected]>---
Tested-by: Disha Goel <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Madhavan Srinivasan <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Nageswara R Sastry <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

tools/perf/tests/topology.c

@@ -109,6 +109,17 @@ static int check_cpu_topology(char *path, struct perf_cpu_map *map)
 			&& strncmp(session->header.env.arch, "aarch64", 7))
 		return TEST_SKIP;
 
+	/*
+	 * In powerpc pSeries platform, not all the topology information
+	 * are exposed via sysfs. Due to restriction, detail like
+	 * physical_package_id will be set to -1. Hence skip this
+	 * test if physical_package_id returns -1 for cpu from perf_cpu_map.
+	 */
+	if (strncmp(session->header.env.arch, "powerpc", 7)) {
+		if (cpu__get_socket_id(perf_cpu_map__cpu(map, 0)) == -1)
+			return TEST_SKIP;
+	}
+
 	TEST_ASSERT_VAL("Session header CPU map not set", session->header.env.cpu);
 
 	for (i = 0; i < session->header.env.nr_cpus_avail; i++) {