MIPS: smp-cps: function to determine whether CPS SMP is in use

The core power down state for cpuidle will require that the CPS SMP
implementation is in use. This patch provides a mips_cps_smp_in_use
function which determines whether or not the CPS SMP implementation is
currently in use.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>

arch/mips/include/asm/smp-cps.h

@@ -31,6 +31,8 @@ extern void mips_cps_core_init(void);
 
 extern struct vpe_boot_config *mips_cps_boot_vpes(void);
 
+extern bool mips_cps_smp_in_use(void);
+
 #else /* __ASSEMBLY__ */
 
 .extern mips_cps_bootcfg;

arch/mips/kernel/smp-cps.c

@@ -260,6 +260,12 @@ static struct plat_smp_ops cps_smp_ops = {
 	.cpus_done		= cps_cpus_done,
 };
 
+bool mips_cps_smp_in_use(void)
+{
+	extern struct plat_smp_ops *mp_ops;
+	return mp_ops == &cps_smp_ops;
+}
+
 int register_cps_smp_ops(void)
 {
 	if (!mips_cm_present()) {