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
18 extern struct mutex smp_cpu_state_mutex;
19 extern unsigned int smp_cpu_mt_shift;
20 extern unsigned int smp_cpu_mtid;
21
22 extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
23
24 extern void arch_send_call_function_single_ipi(int cpu);
25 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
26
27 extern void smp_call_online_cpu(void (*func)(void *), void *);
28 extern void smp_call_ipl_cpu(void (*func)(void *), void *);
29
30 extern int smp_find_processor_id(u16 address);
31 extern int smp_store_status(int cpu);
32 extern void smp_save_dump_cpus(void);
33 extern int smp_vcpu_scheduled(int cpu);
34 extern void smp_yield_cpu(int cpu);
35 extern void smp_cpu_set_polarization(int cpu, int val);
36 extern int smp_cpu_get_polarization(int cpu);
37 extern void smp_fill_possible_mask(void);
38
39 #else /* CONFIG_SMP */
40
41 #define smp_cpu_mtid 0
42
smp_call_ipl_cpu(void (* func)(void *),void * data)43 static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
44 {
45 func(data);
46 }
47
smp_call_online_cpu(void (* func)(void *),void * data)48 static inline void smp_call_online_cpu(void (*func)(void *), void *data)
49 {
50 func(data);
51 }
52
smp_find_processor_id(u16 address)53 static inline int smp_find_processor_id(u16 address) { return 0; }
smp_store_status(int cpu)54 static inline int smp_store_status(int cpu) { return 0; }
smp_vcpu_scheduled(int cpu)55 static inline int smp_vcpu_scheduled(int cpu) { return 1; }
smp_yield_cpu(int cpu)56 static inline void smp_yield_cpu(int cpu) { }
smp_fill_possible_mask(void)57 static inline void smp_fill_possible_mask(void) { }
smp_save_dump_cpus(void)58 static inline void smp_save_dump_cpus(void) { }
59
60 #endif /* CONFIG_SMP */
61
smp_stop_cpu(void)62 static inline void smp_stop_cpu(void)
63 {
64 u16 pcpu = stap();
65
66 for (;;) {
67 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
68 cpu_relax();
69 }
70 }
71
72 #ifdef CONFIG_HOTPLUG_CPU
73 extern int smp_rescan_cpus(void);
74 extern void __noreturn cpu_die(void);
75 extern void __cpu_die(unsigned int cpu);
76 extern int __cpu_disable(void);
77 #else
smp_rescan_cpus(void)78 static inline int smp_rescan_cpus(void) { return 0; }
cpu_die(void)79 static inline void cpu_die(void) { }
80 #endif
81
82 #endif /* __ASM_SMP_H */
83