tools/power/x86/intel-speed-select: Account for missing sysfs for die_id

Some older kernels will not have support to get CPU die_id from the
sysfs. This requires several back ports. But the tool depends on getting
die_id to match to correct CPU.

Relax this restriction and use die_id as 0 when die_id is missing. This
is not a problem as we don't have any multi-die processors with Intel SST
support.

This helps in running this tool on older kernels with just Intel SST
drivers back ported.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/platform-driver-x86/57d6648282491906e0e1f70fe3b9a44f72cec90d.camel@intel.com/
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c
index cd089a50585940da78b95575d66bd0ade6f6b268..271bc79bdc594bfb5ede1b2d0c3effa1abaefd4f 100644 (file)
--- a/tools/power/x86/intel-speed-select/isst-config.c
+++ b/tools/power/x86/intel-speed-select/isst-config.c
@@ -328,8 +328,12 @@ int get_physical_die_id(int cpu)
                int core_id, pkg_id, die_id;
 
                ret = get_stored_topology_info(cpu, &core_id, &pkg_id, &die_id);
-               if (!ret)
+               if (!ret) {
+                       if (die_id < 0)
+                               die_id = 0;
+
                        return die_id;
+               }
        }
 
        if (ret < 0)