selftests/resctrl: Use cache index3 id for AMD schemata masks

AMD uses the cache l3 boundary for schemata masks. Update it accordigly.
Signed-off-by: Babu Moger <babu.moger@amd.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/resctrl/resctrlfs.c

@@ -113,8 +113,13 @@ int get_resource_id(int cpu_no, int *resource_id)
 	char phys_pkg_path[1024];
 	FILE *fp;
 
-	sprintf(phys_pkg_path, "%s%d/topology/physical_package_id",
-		PHYS_ID_PATH, cpu_no);
+	if (is_amd)
+		sprintf(phys_pkg_path, "%s%d/cache/index3/id",
+			PHYS_ID_PATH, cpu_no);
+	else
+		sprintf(phys_pkg_path, "%s%d/topology/physical_package_id",
+			PHYS_ID_PATH, cpu_no);
+
 	fp = fopen(phys_pkg_path, "r");
 	if (!fp) {
 		perror("Failed to open physical_package_id");