1/*
2 *    Copyright IBM Corp. 1999, 2012
3 *    Author(s): Denis Joseph Barrow,
4 *		 Martin Schwidefsky <schwidefsky@de.ibm.com>,
5 *		 Heiko Carstens <heiko.carstens@de.ibm.com>,
6 */
7#ifndef __ASM_SMP_H
8#define __ASM_SMP_H
9
10#include <asm/sigp.h>
11
12#ifdef CONFIG_SMP
13
14#include <asm/lowcore.h>
15
16#define raw_smp_processor_id()	(S390_lowcore.cpu_nr)
17
18extern struct mutex smp_cpu_state_mutex;
19extern unsigned int smp_cpu_mt_shift;
20extern unsigned int smp_cpu_mtid;
21
22extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
23
24extern void arch_send_call_function_single_ipi(int cpu);
25extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
26
27extern void smp_call_online_cpu(void (*func)(void *), void *);
28extern void smp_call_ipl_cpu(void (*func)(void *), void *);
29
30extern int smp_find_processor_id(u16 address);
31extern int smp_store_status(int cpu);
32extern int smp_vcpu_scheduled(int cpu);
33extern void smp_yield_cpu(int cpu);
34extern void smp_cpu_set_polarization(int cpu, int val);
35extern int smp_cpu_get_polarization(int cpu);
36extern void smp_fill_possible_mask(void);
37
38#else /* CONFIG_SMP */
39
40#define smp_cpu_mtid	0
41
42static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
43{
44	func(data);
45}
46
47static inline void smp_call_online_cpu(void (*func)(void *), void *data)
48{
49	func(data);
50}
51
52static inline int smp_find_processor_id(u16 address) { return 0; }
53static inline int smp_store_status(int cpu) { return 0; }
54static inline int smp_vcpu_scheduled(int cpu) { return 1; }
55static inline void smp_yield_cpu(int cpu) { }
56static inline void smp_fill_possible_mask(void) { }
57
58#endif /* CONFIG_SMP */
59
60static inline void smp_stop_cpu(void)
61{
62	u16 pcpu = stap();
63
64	for (;;) {
65		__pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
66		cpu_relax();
67	}
68}
69
70#ifdef CONFIG_HOTPLUG_CPU
71extern int smp_rescan_cpus(void);
72extern void __noreturn cpu_die(void);
73extern void __cpu_die(unsigned int cpu);
74extern int __cpu_disable(void);
75#else
76static inline int smp_rescan_cpus(void) { return 0; }
77static inline void cpu_die(void) { }
78#endif
79
80#endif /* __ASM_SMP_H */
81