tools/power turbostat: fix segfault on 'no node' machines

Running turbostat on machines that don't expose nodes
in sysfs (no /sys/bus/node) causes a segfault or a -nan
value diesplayed in the log. This is caused by
physical_node_id being reported as -1 and logical_node_id
being calculated as a negative number resulting in the new
GET_THREAD/GET_CORE returning an incorrect address.

Signed-off-by: Nathan Ciobanu <nathan.d.ciobanu@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

tools/power/x86/turbostat/turbostat.c

@@ -2492,6 +2492,12 @@ void set_node_data(void)
 		if (pni[pkg].count > topo.nodes_per_pkg)
 			topo.nodes_per_pkg = pni[0].count;
 
+	/* Fake 1 node per pkg for machines that don't
+	 * expose nodes and thus avoid -nan results
+	 */
+	if (topo.nodes_per_pkg == 0)
+		topo.nodes_per_pkg = 1;
+
 	for (cpu = 0; cpu < topo.num_cpus; cpu++) {
 		pkg = cpus[cpu].physical_package_id;
 		node = cpus[cpu].physical_node_id;
@@ -4904,6 +4910,13 @@ void init_counter(struct thread_data *thread_base, struct core_data *core_base,
 	struct core_data *c;
 	struct pkg_data *p;
 
+
+	/* Workaround for systems where physical_node_id==-1
+	 * and logical_node_id==(-1 - topo.num_cpus)
+	 */
+	if (node_id < 0)
+		node_id = 0;
+
 	t = GET_THREAD(thread_base, thread_id, core_id, node_id, pkg_id);
 	c = GET_CORE(core_base, core_id, node_id, pkg_id);
 	p = GET_PKG(pkg_base, pkg_id);