tools/power/x86/intel-speed-select: Introduce isst_is_punit_valid()

Introduce isst_is_punit_valid() for checking a valid domain.

For current platforms, it requires a punit 0 in a valid Package/Die.

No functional changes are expected.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[srinivas.pandruvada@linux.intel.com: changelog edits]
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

tools/power/x86/intel-speed-select/isst-core.c

@@ -25,6 +25,17 @@ char *isst_get_trl_level_name(int level)
 	}
 }
 
+int isst_is_punit_valid(struct isst_id *id)
+{
+	if (id->cpu < 0)
+		return 0;
+
+	if (id->pkg < 0 || id->die < 0 || id->punit)
+		return 0;
+
+	return 1;
+}
+
 int isst_write_pm_config(struct isst_id *id, int cp_state)
 {
 	unsigned int req, resp;

tools/power/x86/intel-speed-select/isst.h

@@ -205,6 +205,7 @@ extern int isst_send_msr_command(unsigned int cpu, unsigned int command,
 
 extern int isst_get_trl_max_levels(void);
 extern char *isst_get_trl_level_name(int level);
+extern int isst_is_punit_valid(struct isst_id *id);
 
 extern int isst_get_ctdp_levels(struct isst_id *id, struct isst_pkg_ctdp *pkg_dev);
 extern int isst_get_ctdp_control(struct isst_id *id, int config_index,