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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Heiko Carstensa53c8fa2012-07-20 11:15:04 +02002 * Copyright IBM Corp. 1999, 2012
Heiko Carstensc20c89a2009-12-07 12:52:07 +01003 * Author(s): Denis Joseph Barrow,
4 * Martin Schwidefsky <schwidefsky@de.ibm.com>,
5 * Heiko Carstens <heiko.carstens@de.ibm.com>,
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 */
7#ifndef __ASM_SMP_H
8#define __ASM_SMP_H
9
Heiko Carstense7c46c62014-04-04 11:23:03 +020010#include <asm/sigp.h>
11
Heiko Carstensc20c89a2009-12-07 12:52:07 +010012#ifdef CONFIG_SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
David Howellsa0616cd2012-03-28 18:30:02 +010014#include <asm/lowcore.h>
Heiko Carstens2b67fc42007-02-05 21:16:47 +010015
Martin Schwidefsky7b468482009-03-26 15:24:42 +010016#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Heiko Carstensdbd70fb2008-04-17 07:46:12 +020018extern struct mutex smp_cpu_state_mutex;
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040019
Thomas Gleixner8239c252012-04-20 13:05:42 +000020extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
Heiko Carstensdbd70fb2008-04-17 07:46:12 +020021
Heiko Carstensca9fc752008-12-25 13:38:39 +010022extern void arch_send_call_function_single_ipi(int cpu);
Rusty Russell630cd042009-09-24 09:34:45 -060023extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
Heiko Carstensca9fc752008-12-25 13:38:39 +010024
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040025extern void smp_call_online_cpu(void (*func)(void *), void *);
26extern void smp_call_ipl_cpu(void (*func)(void *), void *);
Heiko Carstensc20c89a2009-12-07 12:52:07 +010027
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040028extern int smp_find_processor_id(u16 address);
29extern int smp_store_status(int cpu);
30extern int smp_vcpu_scheduled(int cpu);
31extern void smp_yield_cpu(int cpu);
32extern void smp_yield(void);
Heiko Carstens50ab9a92012-09-04 17:36:16 +020033extern void smp_cpu_set_polarization(int cpu, int val);
34extern int smp_cpu_get_polarization(int cpu);
Heiko Carstensd80512f2013-12-16 14:31:26 +010035extern void smp_fill_possible_mask(void);
Gerald Schaefer59b69782010-02-26 22:37:40 +010036
Heiko Carstens2c2df112010-02-26 22:37:34 +010037#else /* CONFIG_SMP */
38
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040039static inline void smp_call_ipl_cpu(void (*func)(void *), void *data)
Heiko Carstens2c2df112010-02-26 22:37:34 +010040{
41 func(data);
42}
43
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040044static inline void smp_call_online_cpu(void (*func)(void *), void *data)
Michael Holzheu1943f532011-10-30 15:16:38 +010045{
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040046 func(data);
Michael Holzheu1943f532011-10-30 15:16:38 +010047}
48
Heiko Carstens0d0e4712012-08-27 15:38:19 +020049static inline int smp_find_processor_id(u16 address) { return 0; }
Heiko Carstens29a877f2012-08-27 15:18:45 +020050static inline int smp_store_status(int cpu) { return 0; }
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040051static inline int smp_vcpu_scheduled(int cpu) { return 1; }
52static inline void smp_yield_cpu(int cpu) { }
53static inline void smp_yield(void) { }
Heiko Carstensd80512f2013-12-16 14:31:26 +010054static inline void smp_fill_possible_mask(void) { }
Gerald Schaefer59b69782010-02-26 22:37:40 +010055
Michael Holzheuf4192bf2014-04-15 11:25:28 +020056#endif /* CONFIG_SMP */
57
Heiko Carstense7c46c62014-04-04 11:23:03 +020058static inline void smp_stop_cpu(void)
59{
60 u16 pcpu = stap();
61
62 for (;;) {
63 __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL);
64 cpu_relax();
65 }
66}
67
Heiko Carstens1e489512008-04-30 13:38:37 +020068#ifdef CONFIG_HOTPLUG_CPU
69extern int smp_rescan_cpus(void);
Heiko Carstensda7f51c2011-01-05 12:48:09 +010070extern void __noreturn cpu_die(void);
Martin Schwidefsky8b646bd2012-03-11 11:59:26 -040071extern void __cpu_die(unsigned int cpu);
72extern int __cpu_disable(void);
Heiko Carstens1e489512008-04-30 13:38:37 +020073#else
74static inline int smp_rescan_cpus(void) { return 0; }
Heiko Carstensda7f51c2011-01-05 12:48:09 +010075static inline void cpu_die(void) { }
Heiko Carstens1e489512008-04-30 13:38:37 +020076#endif
77
Heiko Carstensc20c89a2009-12-07 12:52:07 +010078#endif /* __ASM_SMP_H */