1 files changed, 96 insertions, 0 deletions
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
new file mode 100644
index 000000000..3907ead27
--- /dev/null
+++ b/arch/s390/include/asm/smp.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    Copyright IBM Corp. 1999, 2012
+ *    Author(s): Denis Joseph Barrow,
+ *		 Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ *		 Heiko Carstens <heiko.carstens@de.ibm.com>,
+ */
+#ifndef __ASM_SMP_H
+#define __ASM_SMP_H
+
+#include <asm/sigp.h>
+
+#ifdef CONFIG_SMP
+
+#include <asm/lowcore.h>
+
+#define raw_smp_processor_id()	(S390_lowcore.cpu_nr)
+
+extern struct mutex smp_cpu_state_mutex;
+extern unsigned int smp_cpu_mt_shift;
+extern unsigned int smp_cpu_mtid;
+extern __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
+
+extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
+
+extern void arch_send_call_function_single_ipi(int cpu);
+extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
+
+extern void smp_call_online_cpu(void (*func)(void *), void *);
+extern void smp_call_ipl_cpu(void (*func)(void *), void *);
+extern void smp_emergency_stop(void);
+
+extern int smp_find_processor_id(u16 address);
+extern int smp_store_status(int cpu);
+extern void smp_save_dump_cpus(void);
+extern int smp_vcpu_scheduled(int cpu);
+extern void smp_yield_cpu(int cpu);
+extern void smp_cpu_set_polarization(int cpu, int val);
+extern int smp_cpu_get_polarization(int cpu);
+extern void smp_fill_possible_mask(void);
+extern void smp_detect_cpus(void);
+
+#else /* CONFIG_SMP */
+
+#define smp_cpu_mtid	0
+
+static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
+{
+	func(data);
+}
+
+static inline void smp_call_online_cpu(void (*func)(void *), void *data)
+{
+	func(data);
+}
+
+static inline void smp_emergency_stop(void)
+{
+}
+
+static inline int smp_find_processor_id(u16 address) { return 0; }
+static inline int smp_store_status(int cpu) { return 0; }
+static inline int smp_vcpu_scheduled(int cpu) { return 1; }
+static inline void smp_yield_cpu(int cpu) { }
+static inline void smp_fill_possible_mask(void) { }
+static inline void smp_detect_cpus(void) { }
+
+#endif /* CONFIG_SMP */
+
+static inline void smp_stop_cpu(void)
+{
+	u16 pcpu = stap();
+
+	for (;;) {
+		__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
+		cpu_relax();
+	}
+}
+
+/* Return thread 0 CPU number as base CPU */
+static inline int smp_get_base_cpu(int cpu)
+{
+	return cpu - (cpu % (smp_cpu_mtid + 1));
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+extern int smp_rescan_cpus(void);
+extern void __noreturn cpu_die(void);
+extern void __cpu_die(unsigned int cpu);
+extern int __cpu_disable(void);
+#else
+static inline int smp_rescan_cpus(void) { return 0; }
+static inline void cpu_die(void) { }
+#endif
+
+#endif /* __ASM_SMP_H */