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Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * Copyright IBM Corp. 1999,2009
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#ifdef CONFIG_SMP
11
12#include <asm/system.h>
13#include <asm/sigp.h>
14
15extern void machine_restart_smp(char *);
16extern void machine_halt_smp(void);
17extern void machine_power_off_smp(void);
18
19#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
20
21extern int __cpu_disable (void);
22extern void __cpu_die (unsigned int cpu);
23extern void cpu_die (void) __attribute__ ((noreturn));
24extern int __cpu_up (unsigned int cpu);
25
26extern struct mutex smp_cpu_state_mutex;
27extern int smp_cpu_polarization[];
28
29extern void arch_send_call_function_single_ipi(int cpu);
30extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
31
32extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
33
34extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
35extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
36 int from, int to);
37extern void smp_restart_cpu(void);
38
39/*
40 * returns 1 if (virtual) cpu is scheduled
41 * returns 0 otherwise
42 */
43static inline int smp_vcpu_scheduled(int cpu)
44{
45 u32 status;
46
47 switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) {
48 case sigp_status_stored:
49 /* Check for running status */
50 if (status & 0x400)
51 return 0;
52 break;
53 case sigp_not_operational:
54 return 0;
55 default:
56 break;
57 }
58 return 1;
59}
60
61#else /* CONFIG_SMP */
62
63static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
64{
65 func(data);
66}
67
68#define smp_vcpu_scheduled (1)
69
70#endif /* CONFIG_SMP */
71
72#ifdef CONFIG_HOTPLUG_CPU
73extern int smp_rescan_cpus(void);
74#else
75static inline int smp_rescan_cpus(void) { return 0; }
76#endif
77
78#endif /* __ASM_SMP_H */